Antenna device and wireless communication device using same

The present invention relates to an antenna device for performing wireless communication and a wireless communication device using the antenna device.

Figure<u style="single">6</u>An example of a portable telephone as a wireless communication device (see Patent Document 1) is shown by an external view on the rear side. Figure<u style="single">6</u>Is a perspective view when the LCD (liquid crystal screen) and the key portion are arranged face down on the paper surface. Figure<u style="single">6</u>The portable telephone 40 shown in the above has an antenna element 42 and a non-feeding element 43 built in the housing 41. The antenna element 42 is configured to be fed from the feeding unit 44 at the center of the antenna.

The non-feeding element 43 and the antenna element 42 are provided on the same surface with a distance from each other, and are attached to, for example, the inner wall of the housing 41. The non-feeding element 43 is provided on the upper end side inside the housing 41. The antenna element 42 is provided inside the non-feeding element 43. The antenna element 42 and the non-feeding element 43 are electrically coupled.

<patcit num="1"><text>Patent Gazette No. 3608735</text></patcit>

<p> By the way, various shapes of mobile phones are made, and it is expected that diversification will continue in the future. Then, it may be required to make the antenna arrangement space in the portable telephone smaller than the present. However, in the portable telephone 40, the antenna element 42 and the non-feeding element 43 are provided on the same surface with a distance from each other, and the antenna element 42 is formed inside the non-feeding element 43. Therefore, the degree of freedom in designing these elements 42 and 43 is low. In addition, the antenna characteristics are better when the amount of protrusion from the ground end is large. Therefore, an arrangement in which the protrusion amount of the antenna element 42 is smaller than the protrusion amount of the non-feeding element 43 is a disadvantageous location in terms of antenna characteristics.</p><p> That is, in a configuration in which a feeding element such as an antenna element and a non-feeding element are arranged on the same plane, if an attempt is made to design so that a required protrusion amount can be obtained, the antenna device may become large. Therefore, there is a problem that it is difficult to adapt to the miniaturization of the antenna device and the wireless communication device formed by providing the antenna device.</p>

<p> The present invention serves as a means for solving the above-mentioned problems with the following configurations. That is, the present invention<u style="single">On the surface of a rectangular parallelepiped dielectric substrate,</u>A power feeding element that is fed from a contact on the circuit board and the feeding element are arranged via an interval.<u style="single">Resonates at a frequency different from that of the feeding element.</u>With a non-feeding element<u style="single">Is formed</u>An antenna device having a configuration in which the non-feeding element and the feeding element are capacitively coupled to create a resonance state.<u style="single">A ground surface is formed on the circuit board, and the dielectric substrate is arranged at a position close to the ground surface and protruding outward from the ground surface.</u><u style="single">The power feeding element has a connecting portion for connecting to a contact on the circuit board on the side near the center in the longitudinal direction of the side surface on the front side when viewed from the ground surface side of the dielectric substrate facing the ground surface. After rising from the portion toward the upper surface of the dielectric substrate, it extends toward one end side in the longitudinal direction of the dielectric substrate on the upper surface of the dielectric substrate, and then dielectrics along the inner edge of the upper surface of the dielectric substrate. It is formed in a three-dimensional shape with a portion extending from the opposite end side of the body substrate to the opposite end side in the longitudinal direction and further extending from the back side to the front side of the upper surface of the dielectric substrate as an open end.</u><u style="single">The non-feeding element extends from one end side to the other end side in the longitudinal direction of the dielectric substrate along the lower edge of the back side surface opposite to the front side surface of the dielectric substrate. From one end side of the extension portion, the inner side surface of the dielectric substrate rises from the lower side, crosses the upper surface of one end side of the dielectric substrate, and further downwards along the front side surface of the dielectric substrate. The first open end extending to the side is formed to be elongated, and the inner side surface of the dielectric substrate rises from the lower side from the other end side of the extending portion along the lower end edge of the inner side surface to be dielectric. A second open end is formed in close proximity to the open end of the power feeding element formed on the upper surface side of the body substrate and is capacitively coupled to the open end of the feeding element, and the non-feeding element is also formed in a three-dimensional shape. Ori,</u><u style="single">An extension portion of a power feeding element that extends in the longitudinal direction of the dielectric substrate along the inner edge of the upper surface of the dielectric substrate, and a dielectric along the lower edge of the inner side surface of the dielectric substrate. The extension portion of the non-feeding element extending from one end side to the other end side in the longitudinal direction of the body substrate is formed as a protruding portion with respect to the ground surface protruding outward from the ground surface of the circuit board by approximately the same amount.</u>It is characterized by that.</p>

<p> The antenna device of the present invention has a configuration in which a feeding element fed from a contact on a circuit board and a non-feeding element arranged via a gap between the feeding element are capacitively coupled to create a resonance state. Further, the non-feeding element is formed so as to resonate at a frequency different from that of the feeding element.</p><p> The feeding element and the non-feeding element are the circuit boards.<u style="single">Close to</u>It is placed in contact. However, both the feeding element and the non-feeding element protrude outside the one end side end surface of the ground surface formed on the circuit board.<u style="single">Shape</u>Because it is made, it is not easily affected by the ground surface.</p><p> What are the feeding element and the non-feeding element?<u style="single">, Standing</u>It is physically formed. Due to this three-dimensional formation, the feeding element<u style="single">With the child</u>Passive repeater<u style="single">The child</u>, Each other<u style="single">Before</u>The amount of protrusion from the ground surface to the outside is approximately the same.<u style="single">Can have a site</u>.. Therefore, the antenna device of the present invention can effectively utilize the arrangement space thereof. For example, when the antenna device of the present invention is provided at the terminal portion of the wireless communication device, both the feeding element and the non-feeding element can be arranged in the end region thereof. Therefore, even if the antenna device of the present invention is miniaturized, deterioration of the antenna gain can be prevented and good antenna characteristics can be obtained.</p>

<figref num="1a">It is a schematic perspective view for demonstrating the antenna device of 1st Example.</figref><figref num="1b">It is a schematic side view for demonstrating the antenna device of 1st Example.</figref><figref num="2a">It is external drawing of the mobile phone explaining the example of the arrangement position when the antenna device of this invention is provided in a mobile phone.</figref><figref num="2b">It is a folding state diagram of the foldable mobile phone for explaining the example of the arrangement position when the antenna device of this invention is provided in a mobile phone.</figref><figref num="2c">It is a figure of the foldable mobile phone in the open state explaining the example of the arrangement position when the antenna device of this invention is provided in a mobile phone.</figref><figref num="3">It is a figure for demonstrating the antenna device of 2nd Example.</figref><figref num="4">It is a figure for demonstrating the antenna device of 3rd Example.</figref><figref num="5"><u style="single">It is a figure for demonstrating the antenna device of another Example.</u></figref><figref num="6"><u style="single">It is a figure for demonstrating one of the antenna devices described in Patent Document 1.</u></figref>

Code description

1 Antenna device 2 Feeding element 3 Passive element 4 Circuit board 5 Ground surface 6,7 Ground end extension part 8 Connected electrode part 9,12,13 Open end 10 Dielectric substrate 11 Branch part 14 Proximity arrangement area 15 Contact

Hereinafter, examples of the present invention will be described with reference to the drawings. In the description of this embodiment, duplicate description with the conventional example will be omitted or simplified.

FIG. 1a shows the antenna device 1 of the first embodiment together with the circuit board 4 in a schematic perspective view. FIG. 1b shows the antenna device 1 of the first embodiment by a side view seen from the right side of FIG. 1a. This antenna device 1 has a feeding element 2 and a non-feeding element 3. The power feeding element 2 is fed from the contact 15 (see FIG. 1b) on the circuit board 4. The non-feeding element 3 is arranged with a distance from the feeding element 2. The non-feeding element 3 and the feeding element 2 are capacitively coupled via a region arranged close to each other to create a resonance state.

Both the feeding element 2 and the non-feeding element 3 are arranged close to the circuit board 4 via a dielectric substrate 10 provided on the outside of the rectangular circuit board 4. The feeding element 2 and the non-feeding element 3 are attached to the circuit board 4 in a state in which a pattern is formed on the surface of the dielectric substrate 10. In the first embodiment, the ground surface 5 is formed in the entire surface region of the circuit board 4. Both the feeding element 2 and the non-feeding element 3 are formed so as to protrude outward from one end side of the circuit board 4. As a result, both the feeding element 2 and the non-feeding element 3 are formed so as to protrude outward from one end side end surface of the ground surface 5.

Further, both the power feeding element 2 and the non-feeding element 3 are elongated in the direction along the one end side end surface of the ground surface 5 (that is, in the X direction along the short side end surface of the circuit board 4 in this embodiment). Has been done. These portions that are elongated and formed in the direction along the one end side end surface of the ground surface 5 are formed as the extension portions 6 and 7 along the ground end, respectively. The extension portion 6 along the ground end of the power feeding element 2 is formed as a surface formed substantially parallel to the substrate surface of the circuit board 4. The extension portion 7 along the ground end of the non-feeding element 3 is formed as a surface formed so as to be substantially orthogonal or orthogonal to the substrate surface of the circuit board 4.

The non-feeding element 3 has a plurality of bent portions and is formed three-dimensionally. This embodiment has a characteristic configuration by forming the non-feeding element 3 three-dimensionally in this way. That is, at least a part of the extension portion 6 along the ground end of the feeding element 2 and the extension portion 7 along the ground end of the non-feeding element 3 are spaced from the ground surface 5 to the outside in the thickness direction of the circuit board 4. It is provided in such a manner that the amount of protrusion is substantially the same.

The power feeding element 2 has a connecting electrode portion 8. The connecting electrode portion 8 is connected to the extension portion 6 along the ground end. Further, the connecting electrode portion 8 is detoured so as to be connected from one end side of the extension portion 6 along the ground end to a feeding terminal (terminal provided at the feeding point 15) provided on one end side of the circuit board 4. It has been extended.

That is, the connecting electrode portion 8 is extended from one end side of the extension portion 6 along the ground end on the upper surface of the dielectric substrate 10 in the Y direction along the long side of the circuit board 4, and then the dielectric substrate 10 is extended. The extension direction is changed on the way. Then, the connecting electrode portion 8 is bypassed by being extended in the X direction along the extension portion 6 along the ground end. The extension end side of the connecting electrode portion 8 is extended diagonally downward toward the circuit board 4 side, and is connected to the power supply contact 15 of the circuit board 4.

Further, the power feeding element 2 has an open end 12. The open end 12 is connected to the other end side of the extension portion 6 along the ground end. The open end 12 side of the power feeding element 2 is formed as a surface formed substantially parallel to the substrate surface of the circuit board 4. The open end 12 side is extended in the Y direction toward the circuit board 4 side, then changed in the extension direction, and is formed to be extended in the X direction along the end surface on one end side of the circuit board 2.

The non-feeding element 3 does not conduct to the ground surface 5 of the circuit board 5. The non-feeding element 3 has an open end 13 and an open end 9. The open end 13 is connected to one end side of the extension portion 7 along the ground end and is located on the side close to the open end 12 of the power feeding element 2. The open end 9 is connected to the other end side of the extension portion 7 along the ground end and is located on the side close to the connecting electrode portion 8 of the feeding element 2.

The open end 9 extends upward along the front surface of the dielectric substrate 10 from one end side of the extension portion 7 along the ground end, and then bends at the upper end thereof. The open end 9 is extended in the Y direction along the long side of the circuit board 4 on the upper surface of the dielectric substrate 10. Further, the open end 9 is bent at the end on the circuit board 4 side and extends along the surface of the dielectric base 10 on the circuit board 4 side. In this way, the open end 9 is three-dimensionally formed, and the non-feeding element 3 is three-dimensionally formed.

The open end 13 extends upward on the same surface as the extension portion 7 along the ground end, and then bends at the upper end thereof. The open end 13 is close to the open end 12 of the power feeding element 2 on the same surface, and is extended and arranged toward the circuit board 2. The proximity arrangement region 14 forms a capacitive coupling region between the feeding element 2 and the non-feeding element 3.

The non-feeding element 3 is formed so as to resonate at a frequency different from that of the feeding element 2. It is formed so that 1/2 wavelength of the resonance frequency of the non-feeding element 3 is substantially equal to the effective electric length of the non-feeding element 3. Similarly, the effective electric length of the power feeding element 2 is adjusted so as to correspond to the set resonance frequency of the power feeding element 2.

The antenna device 1 of the present embodiment is configured as described above. For example, as shown in FIGS. 2a, 2b, and 2c, the end side of the portable telephone 20 (indicated by reference numerals A and B in the figure). It is provided at one of the positions). As shown in FIGS. 2b and 2c, the term "end side" means the end in the folded state (the state shown in FIG. 2b) in the foldable portable telephone 20. In this case, the portable telephone 20 can be formed by providing the antenna device 1 at any of the positions of reference numerals A and B in FIG. 2b.

In this embodiment, when a communication signal is supplied from the circuit board 4 side to the power feeding element 2 via the feeding point 15, the feeding element 2 excites the power feeding element 2 based on the communication signal. Further, the feeding element 2 and the non-feeding element 3 are capacitively coupled via the proximity arrangement region 14 to create a resonance state. The non-feeding element 3 operates as an antenna while resonating at a frequency different from that of the feeding element 2 (creating a double resonance state).

In this embodiment, both the power feeding element 2 and the non-feeding element 3 protrude outward from the one end side end surface of the ground surface 5 formed on the circuit board 4 and extend in the direction along the one end side end surface of the ground surface 5. Has been done. Therefore, the above-mentioned antenna operation of this embodiment is not easily affected by the ground surface 5. Therefore, even if the antenna device 1 of the present embodiment is miniaturized, deterioration of the antenna gain can be prevented and good antenna characteristics can be obtained.

Further, in the present embodiment, the feeding element 2 and the non-feeding element 3 are formed by extending the portions along the one end side end surface of the ground surface 5 as the extension portions 6 and 7 along the ground end. .. Further, the non-feeding element 3 has a plurality of bent portions and is formed three-dimensionally. With these configurations, at least a part of the extension portion 6 along the ground end of the feeding element 2 and the extension portion 7 along the ground end of the non-feeding element 3 are vertically spaced from each other, and the amount of protrusion from the ground surface 5 to the outside. Are provided in a manner in which the above are substantially matched. Therefore, in this embodiment, the arrangement space of the antenna device 1 can be effectively used.

When the antenna device 1 of this embodiment is provided at the terminal portion of a wireless communication device such as the portable telephone 20 shown in FIGS. 2a, 2b, and 2c, the feeding element 2 and the non-feeding element Both 3 and 3 are arranged in the area on the end side of the wireless communication device. Therefore, the wireless communication device such as the portable telephone 20 can perform good wireless communication by the antenna device 1 of the present embodiment.

Further, in the present embodiment, the power feeding element 2 and the non-feeding element 3 are attached to the circuit board 4 in a state where the pattern is formed on the dielectric base 10 provided so as to protrude from one end side of the circuit board 4. ing. Therefore, the feeding element 2 and the non-feeding element 3 can be easily and accurately arranged close to the circuit board 4.

Further, in the present embodiment, the power feeding element 2 has a connecting electrode portion 8 bypassing the feeding terminal of the circuit board 4 from one end side of the ground end extending portion 6 on one end side of the ground end extending portion 6. It is provided. Further, the power feeding terminal 2 is provided with an open end 12 on the other end side of the extension portion 6 along the ground end. With these configurations of the connecting electrode portion 8 and the open end 12, in this embodiment, the degree of freedom in designing the feeding element 12 can be increased, and the feeding element 2 can be freely designed. Further, the non-feeding element 3 has a three-dimensional open end 9 and an open end 13 provided in connection with the extension portion 7 along the ground end. Therefore, in this embodiment, the design of the non-feeding element 3 can be freely performed. Therefore, in the antenna device 1 of the present embodiment, even if the antenna device 1 is made compact, the feeding element 2 and the non-feeding element 3 are formed into a desired shape and length, the resonance frequency is easily adjusted, and the desired resonance You can get the frequency.

Further, in this embodiment, the dielectric substrate 10 is provided, and the feeding element 2 and the non-feeding element 3 are patterned on the dielectric substrate 10. Therefore, the feeding element 2 and the non-feeding element 3 can be easily and accurately formed on the dielectric substrate 10. Moreover, when the dielectric substrate 10 is provided, due to the wavelength shortening effect of the dielectric substrate 10, the lengths of the feeding element 2 and the non-feeding element 3 need not be increased as compared with the case where the dielectric substrate 10 is not provided. The set resonance frequency can be obtained.

The second embodiment will be described below. In the description of the second embodiment, the same components as those of the first embodiment are designated by the same reference numerals, and duplicate description of the common parts will be omitted.

The antenna device 1 of the second embodiment is shown in FIG. 3 by a schematic perspective view together with the circuit board 4. This second embodiment has almost the same configuration as the first embodiment. The difference between the second embodiment and the first embodiment is that the power feeding element 2<u style="single">To</u>The branch portion 11 is arranged close to the open end 9 of the non-feeding element 3.<u style="single">Formed</u>Therefore, the proximity arrangement region 14 is formed. In the second embodiment, the proximity arrangement region 14 and the proximity formed at the same positions as those in the first embodiment are provided.<u style="single">Placement</u>Two locations with the region 14 form a capacitive coupling region between the feeding element 2 and the non-feeding element 3.<u style="single">。</u>

The second embodiment is configured as described above, and the second embodiment can also exert the same effect as that of the first embodiment. Further, in the second embodiment, the power feeding element 2<u style="single">To</u>A branch portion 11 is formed, and the branch portion 11 is arranged close to the open end 9 of the non-feeding element 3. As described above, in the second embodiment, by providing the branch portion 11 arranged close to the open end 9, the matching of the non-feeding element 3 can be controlled without affecting the resonance of the feeding element 2 itself.

The third embodiment will be described below. In the description of the third embodiment, the same components as those of the first and second embodiments are designated by the same reference numerals, and duplicate description of the common parts will be omitted.

This first<u style="single">3</u>The antenna device 1 of the embodiment is shown in the figure.<u style="single">4</u>It is shown by a schematic perspective view together with the circuit board 4. No.<u style="single">3</u>In the embodiment, the open end 13 of the non-feeding element 3 located on the open end 12 side of the feeding element 2 extends from the extension portion 7 along the ground end of the non-feeding element 3 without having a bent portion. The open end 13 of the non-feeding element 3 and the extension portion 7 along the ground end are formed on the same surface with each other. Therefore, the extension portion 6 along the ground end of the power feeding element 2 is formed longer along the one end side end surface of the ground surface 5. In the fourth embodiment, the proximity arrangement region 14 between the ground end extension portion 6 of the feeding element 2 and the open end 13 side of the non-feeding element 3 forms a capacitive coupling region between the feeding element 2 and the non-feeding element 3. ing.

No.<u style="single">3</u>The embodiment is configured as described above, and the first<u style="single">3</u>The embodiment can also have the same effect as that of the first embodiment. Also, the first<u style="single">3</u>In the embodiment, the extension portion 6 along the ground end of the power feeding element 2 can be formed longer along the end surface on one end side of the ground surface 5. This makes it the first<u style="single">3</u>In the embodiment, it is possible to improve the antenna characteristics such as the improvement of the antenna efficiency.

As described above, the antenna device 1 of each of the above embodiments can have good antenna characteristics even if it is small, and the antenna space of the wireless communication device can be effectively used. Therefore, by providing the antenna device 1 on the end side of the portable telephone with any of the above embodiments, it is possible to provide a mobile telephone having excellent antenna characteristics. In addition, each of the above<u style="single">Actual</u>The wireless communication device provided with the antenna device 1 of the example can be miniaturized and has desired characteristics, including the above-mentioned mobile phone, by providing the antenna device 1 having an excellent effect as described above. Can be a wireless communication device.

The present invention is not limited to each of the above examples, and various aspects can be adopted. For example, in each of the above embodiments, the dielectric substrate 10 is provided, and the feeding element 2 and the non-feeding element 3 are attached to the circuit board 4 in a pattern formed on the dielectric substrate 10. However, the antenna device 1 is shown in the figure, for example.<u style="single">5</u>As shown in the above, the dielectric substrate 10 may be omitted, and the feeding element 2 and the non-feeding element 3 may be formed in a plate shape and attached to the circuit board 4.

In addition, the figure<u style="single">5</u>Shows an example in which the shapes of the feeding element 2 and the non-feeding element 3 are formed in the same manner as the shapes of the feeding element 2 and the non-feeding element 3 provided in the first embodiment. However, the second above<u style="single">And each of the third</u>The feeding element 2 and the non-feeding element 3 having the same shape as the feeding element 2 and the non-feeding element 3 provided in the embodiment may be formed without using the dielectric substrate 10. Further, the feeding element 2 and the non-feeding element 3 having other shapes can be formed without using the dielectric substrate 10 to form the antenna device 1.

Further, in each of the above embodiments, the feeding element 2 is arranged inside the non-feeding element 3, but the feeding element 2 and the non-feeding element 3 may be interchanged. For example, in each of the above embodiments, a contact 15 is provided at the center of one end side of the circuit board 4, and the power feeding element 2 is connected to the contact 15. However, the arrangement position of the contact 15 is not particularly limited and is appropriately set. Therefore, a contact 15 may be provided at the end (corner side) of the circuit board 4, and one end side of the power feeding element 2 provided in the formation mode of the non-feeding element 3 in each of the above embodiments may be connected to the contact 15. it can.

Further, in each of the above embodiments, the entire surface of the circuit board 4 is the ground surface 5, but a part of the circuit board 4 may be the ground surface 5. In this case, in the antenna device 1 of the present invention, the feeding element 2 and the non-feeding element 3 may be provided on the circuit board 4 as long as they protrude from the one end side end surface of the ground surface 5. When the dielectric substrate 10 is provided, the dielectric substrate 10 may be provided on the circuit board 4.

Further, in each of the above embodiments, the capacitance coupling region between the feeding element 2 and the non-feeding element 3 is set to one or two locations, but the capacitance coupling region may be provided at three or more locations.

Further, in each of the above embodiments, the circuit board 4 is formed in a rectangular shape, but a circuit board 4 having a shape other than the rectangular shape may be used.

Further, although the above description describes an example in which the antenna device 1 of each of the above embodiments is applied to a portable telephone, the antenna device of the present invention may be provided to form a wireless wireless communication device other than the portable telephone. Good.

INDUSTRIAL APPLICABILITY The present invention can provide an antenna device capable of preventing deterioration of antenna gain and obtaining good antenna characteristics even if the size is reduced. Therefore, the present invention is suitable as an antenna device provided in a wireless communication device such as a mobile phone and a wireless communication device thereof, which are required to be miniaturized and have good antenna characteristics.