Antenna unit

Antenna assembly

The present invention relates to an antenna assembly for connecting to an electronic device and transmitting the received wireless signal to the electronic device.

Japanese Laid-Open Patent Publication No. 2000-292522 discloses an antenna assembly for a GPS (Global Positioning System). The antenna unit is inserted into an electronic device such as a PDA (Personal Digital Assistance) or a notebook computer, receives satellite signals from satellites, and transmits data such as the current position to the electronic device. The antenna assembly can extend the distance from the electronic device to the antenna built in the antenna assembly, whereby noise generated by a CPU or the like inside the electronic device is propagated in the space, thereby reducing a bad influence on the antenna assembly.

However, the noise transmitted from the electronic device to the antenna assembly, in addition to the noise propagated in the space as described above, is also transmitted from the electronic device to the antenna assembly through a grounding wire connecting the ground of the electronic device and the ground of the antenna assembly. The noise. If the noise of the grounding wire is transmitted from the electronic device to the antenna assembly, the grounding level may be unstable, the waveform of the received wireless signal is damaged, and the signal receiving sensitivity is deteriorated. In the above antenna assembly, although the noise transmitted in the space can be reduced, the noise transmitted through the ground line cannot be reduced.

The present invention has been made to solve the above problems, and an object of the invention is to provide an antenna assembly capable of reducing noise transmitted from an electronic device via a ground line and preventing deterioration of signal reception sensitivity.

The antenna module of the present invention is connected to an electronic device and transmits the received wireless signal to an antenna unit for an electronic device, and has the following configuration.

The antenna is configured to receive a wireless signal, and the signal processing module converts the wireless signal received by the antenna into signal data sent to the electronic device; the substrate is configured to support the antenna and the signal processing a circuit board having a circuit ground for forming a ground of the signal processing module; a terminal interface, the terminal interface having a terminal block for electrically connecting to the electronic device, and including a ground terminal provided from the terminal block a grounding wire of the circuit ground; electromagnetic shielding, the electromagnetic shielding system surrounds the signal processing module, and the signal processing module is electromagnetically isolated from the antenna, and the electromagnetic shielding is electrically connected to the ground of the circuit; formed by an insulating resin The outer casing is configured to receive the antenna, the substrate, the signal processing module, the terminal interface, and the electromagnetic shielding, and expose the terminal block to the outside.

A feature of the present invention is that the antenna assembly is provided with a noise canceller for canceling the noise generated by the electronic device and transmitted to the ground of the circuit via the ground line; the noise cancellation One end of the device is electrically connected to the electromagnetic shield, and the other end is formed by a conductive branch piece of a free end, and the length of the branch piece is about 1/4 of the wavelength of the wireless signal.

By providing the branch piece, a part of the noise transmitted from the ground line to the electromagnetic shield is branched into the branch piece. Here, since the length of the branch piece is about 1/4 of the wavelength of the wireless signal, the noise has the same frequency as the wireless signal, and if there is a round trip to the branch piece (ie, about 1 of the preceding wavelength) The distance of /2) is delayed by 180 degrees with respect to the noise that has not entered the branch piece. In this way, the noise that is diverged into the tributary piece and the noise that is not diverged into the tributary piece cancel each other, thereby reducing noise.

Therefore, by providing the antenna module of the present invention with the above-described noise canceller, it is possible to reduce noise of the same frequency as the wireless signal from the noise transmitted from the electronic device via the ground line, thereby preventing deterioration of signal reception sensitivity. The branch piece may be formed of a metal wire or may be formed by cutting a part of the electromagnetic shield.

Alternatively, the branch piece may be a rod-like member that is expandable and contractable relative to the outer casing. Alternatively, the branch piece is a rod-shaped member, and the outer casing has an insertion hole inserted into one end of the branch piece on an outer bottom surface thereof, and an inner circumferential surface of the insertion hole is electrically connected to the electromagnetic shield, and the branch The sheet may be electrically connected to the electromagnetic shield via the inner peripheral surface of the insertion hole.

Alternatively, the branch piece may be a rod-like member having one end rotatably supported on the outer bottom surface of the outer casing.

Alternatively, the branch piece may be in the form of a flat plate. In this case, it is preferable that the branch piece is disposed on an outer bottom surface of the outer casing, and includes a vertical plate that electromagnetically isolates between the electronic device and the antenna assembly when the antenna assembly is connected to the electronic device. By having the above vertical plate, it is also possible to easily isolate noise transmitted in the air. Alternatively, the branch piece is a fan-shaped plate, and the noise canceller includes a plurality of the branch pieces, and the plurality of branch pieces are preferably rotatably supported at one end on the outer bottom surface of the outer casing.

Further, the electromagnetic shielding system is disposed on an inner bottom surface of the outer casing, and the antenna assembly further includes an electrode plate that is capacitively coupled to the electromagnetic shield via a bottom surface of the outer casing, and the branching piece preferably has one end connected to the electrode plate And electrically connected to the electromagnetic shield by the above-mentioned electrode plate.

In this case, the electrode plate is attached to the outer bottom surface of the outer casing, and the branch piece is formed by cutting a part of the electrode plate.

Alternatively, the branch piece may be embedded in the outer casing together with the electrode plate.

Alternatively, the antenna assembly includes a plate attached to an outer bottom surface of the outer casing, and the electrode plate and the branch piece may be formed in the plate. Alternatively, the cover may be attached to the outer bottom surface of the outer casing, and the electrode plate and the branch piece may be embedded in the cover.

Alternatively, the electrode plate is attached to the outer bottom surface of the outer casing, and the branch piece is formed in a flat plate shape extending from the electrode plate. In this case, it is preferable that the electrode plate has a vertical plate that electromagnetically isolates between the electronic device and the antenna assembly when the antenna assembly is connected to the electronic device. Alternatively, the electrode plate and the branch piece are fan-shaped plates, and the noise canceller includes a plurality of the flat plates, and the plurality of flat plates are preferably rotatably supported at one end on the outer bottom surface of the outer casing.

Hereinafter, the present invention will be described in detail with reference to the drawings.

The first figure shows an antenna assembly according to a first embodiment of the present invention. As shown in the figure, the antenna assembly is inserted into an interface (not shown) for an SD card of an electronic device such as a PDA or a notebook computer, receives satellite signals from GPS satellites, and transmits data such as the current position to the electronic device. GPS antenna assembly.

The outer casing of the antenna assembly is formed of an insulating resin, and as shown in the third figure, the base 10, the top cover 11 attached to the base 10, and the interface cover 12 are formed.

As shown in the fourth figure, the substrate 20 is housed in a portion of the susceptor 10 covered by the top cover 11. A signal processing module composed of a plurality of circuit elements is mounted on both surfaces of the substrate 20. As shown in the fourth and fifth figures, the signal processing module is surrounded by the electromagnetic shields 21, 22 on both sides of the substrate 20. The antenna 23 that receives the satellite signal from the GPS satellite is fixed to the electromagnetic shield 21 on the surface side of the substrate 20. The antenna 23 is electromagnetically isolated from the signal processing module by electromagnetic shielding. The signal processing module demodulates the satellite signal received by the antenna 23, extracts the GPS signal, converts it into a signal data based on the SD (Secure Digital) specification, and transmits the signal data to the electronic via the terminal interface 40, which will be described later. Device. Circuit grounds 24 forming the ground of the signal processing module are formed on both surfaces of the substrate 20, and the electromagnetic shields 21, 22 are electrically connected to the circuit ground 24.

As shown in the fifth figure, a conductive branch piece 30 is connected to the electromagnetic shield 22 on the back side of the substrate 20. The branch piece 30 is formed by a thin metal plate, one end of which is electrically connected to the electromagnetic shield, and the other end of which is a free end (in other words, an electrically open end). The branch piece 30 is led out to the outside of the base 10 through a hole 10A (refer to the first figure) provided on the bottom surface of the base 10, and thereafter adhered to the base along the base 10 and the outer surface of the top cover 11 10 with the top cover 11. The details of the branch piece 30 will be described later.

A terminal interface 40 is housed in a portion of the susceptor 10 covered by the interface cover 12. The terminal interface 40 is composed of an IO substrate 40a made of an interface standard for an SD card, and a flat cable 40b that connects the IO substrate 40a and the substrate 20. As shown in FIG. 5, on the back side of the IO substrate 40a, a terminal block 41 that is in contact with a terminal row provided on the interface of the electronic device when the antenna assembly is inserted into the electronic device is formed. As shown in the first figure, the terminal block 41 is exposed to the outside through a plurality of holes provided in the susceptor 10. The terminal block 41 includes a ground terminal connected to a ground terminal on the electronic device side, and the flat cable 40b includes a ground line 42 from the ground terminal to the circuit ground 24 of the substrate 20.

Hereinafter, the branch piece 30 will be described in detail. The branch piece 30 is configured to constitute a noise canceller that cancels noise generated by a CPU or the like of the electronic device and transmitted to the circuit ground 24 via the ground terminal of the terminal block 41 and the ground line 42. The length of the branch piece 30 is about 1/4 of the wavelength of the satellite signal. In other words, the frequency value f (unit: Hz) of the wireless signal for receiving a satellite signal or the like is used because the wavelength λ (unit: meter) uses the velocity C of the radio wave (C=3.0×108 m/sec), and the number is introduced. λ=C/f, so when the frequency of receiving the satellite signal from the GPS satellite is about 1.6 GHz (about 1575.42 MHz), the result of multiplying the wavelength λ calculated from the above equation by 1/4 is the branch piece. The length is in the range of 4.0 to 5.0 cm, especially about 4.7 cm. Similarly, in the case where the frequency of the satellite signal is 1.2 GHz, the length of the branch piece is in the range of 6.0 to 6.5 cm, preferably about 6.3 cm. Referring to the sixth figure, the function of the branch piece will be described in detail. In addition, in order to facilitate understanding, the branch piece 30 is linear in the sixth figure. The noise generated by the electronic device is transmitted to the electromagnetic shields 21, 22 and the antenna 23 through the ground terminal of the terminal interface 40, the ground line 42, and the circuit ground 24. The noise system transmitted to the electromagnetic shield 22 is divided into a direct noise A directly flowing into the electromagnetic shield 22, and a branch noise B flowing into the branch piece 30. The divergent noise B enters the free end of the branch piece 30 and is totally reflected by the free end to return to the electromagnetic shield 22. Here, since the length of the branch piece 30 is about 1/4 of the wavelength of the satellite signal, the bifurcation noise B which is different from the noise having the same frequency as the satellite signal, if it goes to and from the branch piece 30 once ( That is, the distance of about 1/2 of the wavelength of the preceding satellite signal is delayed by 180 degrees with respect to the straight-through noise A. Thereby, the direct noise A and the divergence noise B to and from the branch piece 30 cancel each other, thereby reducing noise.

Generally, the ground line noise has a wide frequency band, but as described above, by using the branch piece 30 of about 1/4 of the wavelength of the satellite signal, the noise of the satellite frequency can be reduced at substantially the same frequency as the satellite signal. The frequency band is stabilized at the ground level. Thereby, the antenna unit provided with the branch piece 30 can receive satellite signals with high sensitivity.

Moreover, the branch piece 30 can not only reduce the ground noise transmitted from the electronic device, but also of course reduce the noise generated by the antenna group itself.

In the present embodiment, the branch piece 30 is connected to the electromagnetic shield 22 on the back side of the substrate 20, but the branch piece 30 may be connected to the electromagnetic shield 21 or the circuit ground 24 on the surface side of the substrate 20. That is, the branch piece 30 may be connected to a portion where the noise of the ground line is transmitted.

Further, the branch piece 30 of the present embodiment is formed of a thin metal plate, and as shown in the seventh figure, the branch piece 30 may be formed of a metal wire such as a wire. As shown in the eighth figure, one end of the metal wire is connected to the electromagnetic shield 21 on the surface side of the substrate 20 by brazing, and is extended from the hole 11a provided in the top cover 11 toward the outside of the casing. The length from the one end to the front end of the wire is about 1/4 of the wavelength of the satellite signal. In this case, since the metal wire is inexpensive, it is possible to suppress an increase in the cost of the branch piece.

Further, the front end of the branch piece 30 formed of a metal wire, as shown in the ninth figure, can also be wound like a spring. In this case, the length of extension of the wire can be shortened. Alternatively, the front end of the tributary piece 30, as shown in the tenth figure, may be wound around a plane perpendicular to the outer casing. In this case, the extension length of the metal wire can also be shortened. Alternatively, the front end of the tributary piece 30, as shown in Fig. 11, may be wound in a plane parallel to the outer casing. In this case, the branch piece 30 does not protrude downward from the bottom surface of the casing, and even if the antenna assembly is placed on the table or the floor surface, the branch piece 30 is not subjected to excessive pressure from the table top. Thereby, damage of the branch piece 30 can be prevented. Alternatively, the front end of the branch piece 30 may be bent in such a manner as to be accommodated within the width of the outer casing as shown in Fig. 12.

As shown in FIG. 13A and FIG. 13B, the branch piece 30 can also be formed by cutting a part of the upper surface of the electromagnetic shield 21 on the surface side of the substrate 20. The length from the root end to the front end of the branch piece 30 is about 1/4 of the wavelength of the satellite signal. In this case, the material of the branch piece 30 can be reduced. Of course, the branch piece 30 can also be formed by cutting a part of the electromagnetic shield 22 on the back side of the substrate 20.

As shown in FIG. 14A and FIG. 14B, the branch piece 30 may also be a rod-shaped member that is expandable and contractable with respect to the outer casing. In the fourteenth diagram A and the fourteenth diagram B, the susceptor 10 has a accommodating portion 60 in which a longitudinal space is accommodated in the back surface thereof, and the rod-shaped branching piece 30 is housed in the accommodating portion 60. A columnar fitting 61 electrically connected to the electromagnetic shield 22 and passing through the intermediate portion of the branch piece 30 is mounted in the upper portion of the branch piece 30. The branch piece 30 has its conductive surface 31 exposed to the outside at its lower end. As shown in FIG. 14B, when the branch piece 30 is pulled out from the accommodating portion 60, the conductive surface 31 is coupled with the fitting 61, and thus The branch piece 30 is electrically connected to the electromagnetic shield 22 . The length from the conductive surface 31 (i.e., the lower end) of the branch piece 30 to the front end is about 1/4 of the wavelength of the satellite signal. In this case, as shown in FIG. 14A, in the state in which the branch piece 30 is housed in the accommodating portion 60, the branch piece 30 and the electromagnetic shield 22 are not electrically connected, and thus the branch piece 30 does not function as a miscellaneous. The function of the message canceller. Therefore, when the influence of the ground noise from the electronic device is small or the antenna module is not used, the branch piece 30 is first accommodated in the accommodating portion 60, and only when the signal reception sensitivity is deteriorated, the branch is extracted. The road piece 30 can be used. In this case, damage to the branch piece 30 can be prevented when the branch piece 30 is not used.

As shown in FIG. 15A, it is preferable to extend the pressure bar 32 formed of a non-conductor below the conductive surface 31 of the branch piece 30 of FIG. 14A and FIG. 14B, and let it pass through the accommodating portion. The bottom surface of 60. In this case, as shown in FIG. 15B, when the antenna assembly is inserted into the interface of the electronic device such as a PDA, the lower end of the pressure bar 32 is pressed against the side surface of the electronic device, and the branch piece 30 is automatically extracted. Thereby, the time for taking out the branch piece 30 can be omitted. The pressure bar 32 is non-conductor and therefore has no effect on the function of the noise canceller.

Alternatively, as shown in Figs. 16A to AC, the branch piece 30 itself may be formed in a telescopic manner to form the branch piece 30. In this case, as shown in FIG. 16A, the damage of the branch piece 30 can be prevented by using the branch piece 30 as small as possible. Further, as shown in FIG. 16B and C, the plurality of extended branch pieces 30 are used. The length of the long tributary patch can be selected for satellite signals of different frequencies (eg, about 1.6 GHz, about 1.2 GHz).

Alternatively, as shown in Fig. 17, the branch piece 30 may be a rod-shaped member, and the accommodating portion 70 having the insertion hole 71 inserted into the lower end of the branch piece 30 may be provided on the back surface of the casing. The inner peripheral surface of the insertion hole 71 is electrically connected to the electromagnetic shield 22, and the branch piece 30 has its conductive surface 31 exposed to the outside at its lower end, and is electrically connected to the electromagnetic shield 22 via the inner peripheral surface of the insertion hole 71. The length from the conductive surface 31 of the branch piece 30 to the front end is about 1/4 of the wavelength of the satellite signal. The insertion hole 71 is horizontally elongated, and the branch piece 30 is inserted into the position of the insertion hole 71, and can be moved by the hand along the longitudinal direction of the insertion hole 71. The signal reception sensitivity can be improved by continuously moving the position of the branch piece 30. Further, when the branch piece 30 is not used, the damage of the branch piece 30 can be prevented by removing the branch piece 30.

Alternatively, as shown in Fig. 18, a plurality of accommodating portions 70 may be provided on the back surface of the casing, and the branching piece 30 may be inserted into the insertion hole 71 of any one of the accommodating portions 70. The inner peripheral surface of all the insertion holes 71 is electrically connected to the electromagnetic shield 22, and the branch piece 30 has its conductive surface 31 exposed to the outside at its lower end, and is electrically connected to the electromagnetic shield 22 via the inner peripheral surface of the insertion hole 71. . The signal receiving sensitivity can be improved by the position of the discontinuous movement insertion into the branch piece 30.

Alternatively, as shown in Fig. 19A, the branch piece 30 may be a rod-like member having one end rotatably supported on the outer bottom surface of the outer casing. The one end of the branch piece 30 is supported by the outer surface of the outer casing by a conductive screw 80. As shown in FIG. 19B, the front end of the screw 80 is electrically connected to the electromagnetic shield 22 through the base 10, and the branch piece 30 is electrically connected to the electromagnetic shield 22 via the screw 80. The length from the one end of the branch piece 30 to the front end of the branch piece 30 is about 1/4 of the wavelength of the satellite signal. The screw 80 functions to fix the base 10 and the top cover 11, and at the same time, serves to support the branch piece 30. In this case, the branch piece 30 such as when the branch piece 30 is not used is in an obstructed state, and the branch piece 30 can be first hidden on the back surface of the casing. In addition, the branch piece 30 can be attached from the back side after assembly of the antenna assembly, making the attachment of the branch piece 30 easy. Further, a stopper that restricts the rotation of the branch piece 30 may be provided in the outer casing. When the branch piece 30 is hidden from the back surface of the casing, as shown in the twentieth diagram, the branch piece 30 can also be bent.

The shape of the branch piece 30, as stated so far, is not limited to a linear shape (linear or curved). For example, as shown in the twenty-first figure, the branch piece 30 may also be a rectangular flat plate shape. In the twenty-first figure, the branch piece 30 is fixed to the outer bottom surface of the outer casing by a screw 80, and the front end of the screw 80 is inserted through the base 10 to be electrically connected to the electromagnetic shield 22. The length from the screw 80 to the front end of the branch piece 30 is about 1/4 of the wavelength of the satellite signal. Moreover, as shown in the twenty-second diagram, the branch piece 30 is extended on the side of the interface cover 12, and the front end of the extended branch piece is preferably provided when the antenna assembly is connected to the electronic device (that is, the antenna assembly is When the electronic device is inserted, the vertical plate 90 between the electronic device and the antenna assembly is electromagnetically insulated. In this case, the noise transmitted from the electronic device to the space and transmitted to the antenna assembly is easily separated by the vertical plate 90, and the noise reduction effect can be further improved. Further, in the twenty-second diagram, the antenna assembly body has a length of about 7 cm in the longitudinal direction and a width of about 3 cm, and the height from the outer bottom surface of the base 10 to the upper surface of the top cover 11 is about 1.4 cm, and the branch piece 30 is The length and the width are both 7 cm, and the length of the branch piece 30 protruding from the top cover 11 in the plan view in the above-described longitudinal direction is about 4 cm. In addition, the height of the vertical plate 90 is about 3 cm.

Further, as shown in FIG. 23A and B, the branch piece 30 is a fan-shaped flat plate, and the antenna assembly includes a plurality of branch pieces 30 as noise cancellers, and the plurality of branch pieces 30 are passed through conductive screws. The 80 is rotatably supported at one end on the outer bottom surface of the outer casing. The front end of the screw 80 is inserted through the base 10 to be electrically connected to the electromagnetic shield 22 . The length from the screw 80 to the front end of the branch piece 30 is about 1/4 of the wavelength of the satellite signal. Further, as shown in Fig. 23B, the plurality of branch pieces 30 can be expanded into a sector shape. By using the fan-shaped unfolding branch piece 30, a uniform branch length can be supplied in the entire specified direction around the antenna assembly, which can improve the noise reduction effect. When the branch piece 30 is not used, as shown in Fig. 23A, by folding the branch piece 30 into one, the branch piece 30 can be prevented from being obstructed. Further, as shown in FIG. 24A, when the branch piece 30 is fixed to the distal end side of the base 10 (on the side opposite to the interface cover), the branch piece 30 can be used when the branch piece 30 is not used. Hidden on the back of the case allows the branch piece 30 to be free from obstructions. When the branch piece 30 is used, as shown in FIG. 24B, the branch piece 30 may be expanded into a fan shape by rotating each of the branch pieces 30 by 180 degrees.

Further, in the above embodiment, the first antenna assembly for GPS is displayed, but the antenna assembly of the present invention is not limited to GPS. For example, an electronic device such as a notebook computer may be inserted to receive a wireless LAN signal, and the received wireless LAN signal may be transmitted to the wireless LAN antenna unit of the electronic device. Further, in the above embodiment, although the interface for the SD card is provided, it is needless to say that the interface is provided with other specifications.

Fig. 25 shows an antenna assembly of a second embodiment of the present invention. The basic configuration of the present embodiment is the same as that of the first embodiment. Therefore, the same reference numerals will be given to the same components, and overlapping description will be omitted.

The antenna assembly is connected to a thin plate 100 made of a thin metal plate on the outer bottom surface of the outer casing. The electrode plate 100 is capacitively coupled to the electromagnetic shield 22 disposed on the inner bottom surface of the base 10 via the bottom surface of the base 10. The branch piece 30 is composed of a thin metal plate, one end of which is connected to the electrode plate 100, and is electrically connected to the electromagnetic shield 22 via the electrode plate 100. The length of the branch piece 30 is about 1/4 of the wavelength of the satellite signal.

In the case of this embodiment, the noise generated by the electronic device is transmitted to the electrode plate 100 that is capacitively coupled to the electromagnetic shield 22 through the ground terminal of the terminal interface 40, the ground line 42, the circuit ground 24, and the electromagnetic shield 22. A portion of the noise transmitted to the plate 100 is diverged into the branch piece 30 and reflected by the free end of the branch piece 30. Thereafter, similarly to the principle explained in the first embodiment, the noise that is branched into the branch piece 30 and the noise that flows directly into the plate 100 cancel each other, and the ground noise of substantially the same frequency as the wireless signal can be reduced. Thereby, the antenna unit provided with the branch piece 30 can receive satellite signals with good sensitivity.

In the case of the present embodiment, the noise canceller can be constructed by simply connecting the electrode plate 100 and the branch piece 30 to the outer casing after assembly of the antenna assembly, and thus the antenna assembly can be easily manufactured.

Further, the branch piece 30 and the electrode plate 100 may not be formed of different metal plates, as shown in the twenty-sixth figure, but may be formed by cutting from the same metal plate. Alternatively, as shown in the twenty-sixth diagram, the branch piece 30 may also be cut from the plate 100. In this case, the material of the branch piece 30 can be reduced. If the branch piece 30 is too thin, the branch piece 30 is easily damaged. Therefore, if the branch piece 30 of the twenty-fifth figure is not attached to the outside of the top cover 11, it is exposed to the outside. For use, the plate 10 preferably has a certain thickness. Further, when the length of the satellite signal is cut into the branch piece 30 from the electrode plate 100 to a length of about 1/4 of the wavelength of the satellite signal, capacitive coupling between the electrode plate 100 and the electromagnetic shield is achieved.

Alternatively, as shown in Fig. 28, the branch piece 30 may be embedded in the outer casing together with the electrode plate 100. In the twenty-eighth diagram, the electrode plate 100 is embedded in the bottom surface of the susceptor 10 so as to be capacitively coupled to the electromagnetic shield 22. The branch piece 30 is formed by being extended from the electrode plate 100 and embedded in a portion formed in the base 10 and a portion embedded in the top cover 11. When the base 10 and the top cover 11 are assembled, the respective portions are formed. Electrical connection. The length from the connection portion of the plate 100 to the branch piece 30 to the branch piece 30 in the top cover is about 1/4 of the wavelength of the satellite signal. In this case, the number of parts can be reduced, and the assembly of the antenna assembly can be improved.

Alternatively, as shown in Fig. 29, the antenna assembly includes a thin-walled non-conductor sheet 110 mounted on the outer bottom surface of the outer casing, and the electrode plate 100 and the branch sheet 30 may be formed in the sheet material 110. The plate 100 is capacitively coupled to the electromagnetic shield 22 via the bottom surface of the base 10 when the plate 110 is mounted to the outer bottom surface of the outer casing. In this case, after the assembly of the antenna assembly, the noise canceller can be constructed by simply attaching the plate member 110 to the outer casing, so that the antenna assembly can be easily manufactured.

The shape of the branch piece 30 in the sheet 110, for example, as shown in Fig. 30, may be a curved shape or, as shown in Fig. 31, may be a spiral shape. In this case, the extension length of the sheet material 110 can be shortened.

As shown in the thirty-second diagram, it is preferable to provide the slit eye 120 of the front end of the plurality of cuttable branch pieces 30 on the sheet 110. In this case, by cutting the front end of the branch piece 30 from the sheet material 110, the length of the branch piece 30 can be adjusted, and a suitable long branch piece can be selected with respect to satellite signals of different frequencies (for example, about 1.6 GHz, about 1.2 GHz). length.

The shape of the sheet 110 is not limited to a rectangular shape, as shown in FIG. 31A, and may be cut along the outer shape of the electrode plate 100 and the branch piece 30. In this case, as shown in Fig. 33B, the sheet 110 can be adhered along the outside of the outer casing, and the protruding portion of the sheet 110 can be removed. Further, in this case as shown in Fig. 31A, if the slit eye 120 of the front end of the plurality of cuttable branch pieces 30 is provided in advance, the length of the branch piece can be adjusted as in the thirty-third figure C.

Alternatively, as shown in FIG. 34A, the branch piece 30 is divided and disposed in the sheet 110, as shown in FIG. 34B, or may be connected by the conductive bridging member 130 as necessary. There are 30 branch roads. In this case, by installing or removing the jumper member 130, the length of the appropriate long branch piece can be selected depending on the wavelength of the satellite signal.

Alternatively, as shown in FIG. 35A, the antenna assembly may further include a resin cover 140 attached to the outer bottom surface of the outer casing (including the periphery of the head cover 11), and the electrode plate 100 and the branch piece 30 are embedded and formed. Inside the cover 140. The plate 100 is disposed on the bottom surface of the cover 140. As shown in FIG. 45B, when the cover 140 is mounted on the outer bottom surface of the outer casing, capacitive coupling is achieved between the base 10 and the electromagnetic shield 22. In this case, the noise canceller can be constructed only by attaching the cover 140 to the antenna assembly, so that the noise canceller function can be easily added even to the conventional antenna assembly.

Alternatively, as shown in the thirty-sixth diagram, the branch piece 30 may be in the form of a flat plate extending from the electrode plate 100 attached to the outer bottom surface of the outer casing. In other words, the electrode plate 100 and the branch piece 30 are attached to a sheet of conductive flat plate 150 on the outer bottom surface of the outer casing, and the portion of the flat plate 150 located on the bottom surface of the base 10 and capacitively coupled to the electromagnetic shield 22 functions as the plate 100. The function, while the portion of the plate 150 protruding from the base 10 functions as a branch piece 30 whose one end is connected to the electrode plate 100. The length of the portion of the plate 150 that protrudes from the susceptor 10 (i.e., the portion that functions as the branching piece 30) is about 1/4 of the wavelength of the satellite signal. In this manner, the shape of the branch piece 30 is not limited to a linear shape (linear shape, curved shape), and may be a flat plate shape. In addition, as shown in the thirty-seventh figure, the electrode plate 100 is preferably provided on the opposite side of the branching piece 30 from electromagnetic isolation when the antenna assembly is connected to the electronic device (that is, when the antenna assembly is inserted into the electronic device). A vertical plate 160 between the electronic device and the antenna assembly. In this case, the noise transmitted from the electronic device to the space and transmitted to the antenna assembly is easily isolated by the vertical plate 160, and the noise reduction effect can be further improved.

Further, as shown in FIG. 38A and B, the electrode plate and the branch piece are referred to as a fan-shaped plate 170, and the antenna assembly is provided with a plurality of plates 170 as noise cancellers, and the plurality of plates 170 are provided with one end by screws 80 It is rotatably supported on the outer bottom surface of the outer casing. As shown in FIG. 38B, the plurality of plates 170 can be expanded into a sector shape. In this case, the portion of the flat plate 170 located on the bottom surface of the susceptor 10 and capacitively coupled to the electromagnetic shield 22 functions as the electrode plate 100, and the portion of the plate 170 protruding from the susceptor 10 functions as the branch piece 30. . The length of the portion of the plate 170 that protrudes from the susceptor 10 (i.e., the portion that functions as a branch piece) is about 1/4 of the wavelength of the satellite signal. By using the plate 170 as a fan shape, a uniform branch length can be supplied in the entire specified direction around the antenna assembly, which can improve the noise reduction effect. When the branch piece is not used, as shown in Fig. A of Fig. A, by folding the plate 170 into one, the branch piece can be prevented from being obstructed. Further, as shown in FIG. 39A, when the plate 170 is fixed to the front end side of the base 10 (on the side opposite to the interface cover), when the branch piece 30 is not used, the plate 170 can be hidden from the outer casing. The back side allows the board 170 to be free from obstructions. When the branch piece 30 is used, as shown in FIG. 29B, the plate 170 may be expanded into a fan shape by rotating each plate 170 by 180 degrees.

In the present embodiment, in addition to the above configuration, various modifications of the branching piece 30 and the electromagnetic shield 22 via the electrode plate 100 can be easily considered as a susceptor in the configuration shown in the first embodiment. For example, the fortieth diagram is a modification example in which the fourteenth diagram B of the first embodiment is used as a susceptor. In the fortieth figure, the accessory 61 is not connected to the electromagnetic shield 22, but is electrically connected to the electrode plate 100. The branching piece 30 is electrically connected to the electromagnetic shield 22 via the fitting 61 and the electrode plate 100. Further, the forty-first diagram is a modification of the seventeenth embodiment of the first embodiment. In the eleventh figure, the inner peripheral surface of the insertion hole 71 is not connected to the electromagnetic shield 22, but is electrically connected to the electrode plate 100, and the branch piece 30 is interposed between the inner peripheral surface of the insertion hole 71 and the plate 100. The electromagnetic shield 22 is electrically connected. Further, the forty-second diagram is a modification of the nineteenth embodiment A of the first embodiment. In the forty-second figure, the screw 80 is electrically connected to the electrode plate 100, and the branch piece 30 is electrically connected to the electromagnetic shield 22 via the screw 80 and the electrode plate 100.

As described above, it is to be understood that the invention is not limited by the scope of the appended claims.

<p>A straight noise</p><p>BDifferent noise</p><p>10 Pedestal</p><p>10A hole</p><p>11Top cover</p><p>11a hole</p><p>12Interface cover</p><p>20Substrate</p><p>21, 22 electromagnetic shielding</p><p>23Antenna</p><p>24Circuit grounding</p><p>30Road film</p><p>31 Conductive surface</p><p>32 pressure bar</p><p>40Terminal interface</p><p>40aIO substrate</p><p>40bflat cable</p><p>41Terminal row</p><p>42Grounding wire</p><p>60 Housing Department</p><p>61Accessories</p><p>71Insert hole</p><p>80 screws</p><p>90 vertical board</p><p>100 plates</p><p>110 plates</p><p>120 stitch eye</p><p>130crossing members</p><p>140Shell cover</p><p>150 tablet</p><p>160 vertical board</p><p>170Sector plate</p>

The first diagram is a schematic diagram of an antenna assembly according to a first embodiment of the present invention.

The second figure is a schematic diagram of a state in which the same antenna assembly is mounted on the PDA.

The third figure is an exploded view of the antenna assembly of the above.

The fourth figure is a schematic view showing the state in which the top cover and the interface cover of the antenna assembly of the above are removed.

The fifth figure is a back view of the substrate and IO substrate of the antenna assembly of the same.

Fig. 6 is an explanatory view for explaining the action of the branch piece of the antenna assembly of the above.

The seventh picture shows a variation of the branch piece of the above.

Figure 8 is a partial cross-sectional view of the antenna assembly of the seventh diagram.

The ninth diagram is a modification of the branch piece of the antenna assembly of the seventh figure.

The tenth figure is a modification of the branch piece of the antenna assembly of the seventh figure.

The eleventh diagram is a modification of the branch piece of the antenna assembly of the seventh figure.

Fig. 12 is a modification of the branch piece of the antenna assembly of the seventh figure.

Fig. 13A is an explanatory view for explaining one of the manufacturing methods of the branch piece.

Figure 13B is a partial cross-sectional view of the antenna assembly incorporated in the branch piece of Figure 13A.

Fig. 14A is a modification of the branch piece of the antenna assembly of the first figure.

Fig. 14B is a schematic view showing the state of extending the branch piece of Fig. 14A.

Fig. 15A is a modification of the branch piece of the antenna assembly of Fig. 14A.

Fig. 15B is a schematic view showing a state in which the antenna assembly of Fig. 15A is inserted into an electronic device.

Fig. 16A is a modification of the branch piece of the antenna assembly of the first figure.

Fig. 16B is a schematic view showing a state in which the branch piece of the sixteenth drawing A is extended.

Fig. 16C is a schematic view showing a state in which the branch piece of the sixteenth figure B is extended.

Fig. 17 is a modification of the branch piece of the antenna assembly of the first figure.

Fig. 18 is a modification of the branch piece of the antenna assembly of the first figure.

Fig. 19A is a modification of the branch piece of the antenna assembly of the first figure.

Fig. 19B is a cross-sectional view of the antenna assembly of Fig. 19A.

Fig. 20 is a modification of the branch piece of the antenna assembly of Fig. 19A.

The twenty-first figure is a variation of the branch piece of the antenna assembly of the first figure.

The twenty-second figure is a variation of the branch piece of the twenty-first figure.

Fig. 23 is a modification of the branch piece of the twenty-first figure.

Fig. 23 is a schematic view showing a state in which the branch piece of Fig. A is developed.

Fig. 24A is a modification of the branch piece of Fig. A of Fig. 23.

Fig. 24B is a schematic view showing a state in which the branch piece of Fig. A is developed.

Fig. 25 is a schematic view showing an antenna assembly according to a second embodiment of the present invention.

Fig. 26 is an explanatory view for explaining one of the methods of manufacturing the branch piece of the above.

The twenty-seventh drawing is an explanatory view for explaining another manufacturing method of the branch piece of the above.

The twenty-eighthth drawing is a schematic view of the branch piece and the electrode plate embedded in the antenna assembly of the twenty-fifth figure.

The twenty-ninth aspect is a modification of the branch piece of the antenna assembly of the twenty-fifth figure.

Fig. 30 is a modification of the branch piece of the antenna assembly of the twenty-ninth embodiment.

The thirty-first figure is a variation of the branch piece of the antenna assembly of the twenty-ninth figure.

The thirty-second figure is a modification of the branch piece of the antenna assembly of the twenty-ninth figure.

Fig. 33 is a modification of the branch piece of the antenna assembly of the twenty-fifth figure.

Fig. 33 is a schematic view showing a state in which the branch piece of Fig. A is attached to the antenna unit.

Fig. 36 is a schematic diagram showing a state in which the front end of the branch piece of the thirty-third figure B is partially cut out.

Figure 34A is a modification of the branch piece of the antenna assembly of the twenty-ninth embodiment.

Figure 34 is a schematic diagram showing the state in which the branch piece of the thirty-fourth figure A is connected by JUMPA.

Fig. 35 is a modification of the antenna assembly of the twenty-fifth diagram.

Fig. 45 is a schematic view showing a state in which the top cover of Fig. A is attached to the antenna assembly.

Figure 36 is a diagram showing a variation of the branch piece of the antenna assembly of the twenty-fifth figure.

Figure 37 is a modification of the antenna assembly of the thirty-sixth diagram.

Fig. 38 is a modification of the branch piece of the antenna assembly of the thirty-sixth figure.

Fig. 38 is a state diagram of the flat plate in which the thirty-eighth figure A is developed.

A thirty-ninth diagram A is a modification of the antenna assembly of the thirty-sixth diagram.

Thirty-ninth Figure B is a state diagram of the flat plate of the thirty-ninth Figure A.

Fig. 40 is a modification of the branch piece of the antenna assembly of the twenty-fifth figure.

The forty-first figure is a variation of the branch piece of the antenna assembly of the twenty-fifth figure.

The forty-second figure is a modification of the branch piece of the antenna assembly of the twenty-fifth figure.