Transmitting and receiving arrangement for portable appliances

p0001Transmitting and / or receiving arrangement for portable devices

p0002The invention relates to a transmitting and / or receiving arrangement for portable devices, consisting of a shield and a conductively connected antenna consisting of two or more substantially equal oriented angled Anteπnenresonatoren.

p0003In EP-A 177 362 a broadband Aπtenne for portable radios is described. It consists of two angled resonators of different resonance frequencies. Both Resona¬ factors are of a common line via a Ab¬ branching in the manner of an "inverted-F antenna" fed. The antenna resonators act independently and are not combined. Therefore, the efficiency is not particularly large. The distance between the parallel legs is constant

p0004In US 4,584,585 an antenna resonators Draht¬ described angles. A resonator will be fed at the end, forming a "Iπverted-L-Aπtenne". The second resonator is coupled radiation. With this arrangement, although a good efficiency is achieved, however, the antenna has a fixed Impe¬ impedance and is poorly adapted. The shape of the active Antennen¬ is relatively difficult to bend resonators, and the base plate has daruberhinaus even one step on. The bandwidth is relatively small.

p0005"Inverted-F Antennas" are from T. Taga and K. Tsuπekawa, "Performance Analysis of a Built-In Planar Inverted F Antenna for Portable Radio Units 800 MHz band," IEEE Trans., Selected Areas in Commun. , Vol. SAC-5, no.5, pp. 921-929, June (1987) is known. An adaptation of such antennas is done by varying the position of the feed point.

p0006The invention has for its object to improve the transmission and Empfaπgsleistung the antenna, at large Bandwidths th simple production and good adaptability to be ensured.

p0007This is according to claim 1 obtained by a transmitting and / or receiving arrangement for portable devices consisting antenna of a shield and a conductively connected thereto An¬, the output of at least one feed line with a Sende¬ or receiver input is connected, wherein the shield ¬ housing made of metal and the antenna of two or more substantially equal oriented angled Antennenresonato¬ ren, said only one antenna resonator with Speiselei¬ device connected and the feed point between the bending edge of Scheitelbereiche≤ and the free resonator end, where a coaxial Durchfühϊung for the feed line exists, and the feed line is connected via a duplex filter with a transmitter output and the receiver input, and wherein .the for varying the input impedance of the antenna the distance between the Antennen¬ resonators in the end area considerably smaller than at the Knick¬ edge of the apex region is.

p0008The unpowered resonators of the antenna are coupled strahlungs¬ excited by the fed resonator, whereby the bandwidth of the antenna is increased. Due to the angled shape and the widening of the ends currents flow in all three spatial directions. Are formed from high cross currents, which require a low impedance. This gap in the directivity of the antenna can be filled. The small footprint is excellent this arrangement for Mobilfunkanwen¬ applications suitable. It is easy to manufacture and the whole high-frequency, low-frequency and digital electronics of a trag¬ Baren radio apparatus can be accommodated in the shield case. The metal casing serves as Erdnachbildung for the antenna. By changing the fixing point of the device on Speiselei¬ antenna resonator, and in that for varying the Eingangsimpezanz the antenna resonators are widened in the region of their ends, the variation range is particularly big. Therefore, can be saved in many Anwendungsfälleπ Aπpassuπgsnetz- works between the antenna and transmit power amplifier and transmit filter, so¬ as between antenna and receiver input or receive filter. The arrangement of the mutually substantially parallel Anteπnenresonatoren can be written as Schlitzaπtenne be¬, the input impedance is variable within wide limits by the width and shape of the slot between the resonators.

p0009The task can according to claim 2, also be achieved in that the transmitting and / or receiving arrangement for portable devices from a shield and a conductively ver¬ affiliated antenna is connected via at least one device with a Speiselei¬ Senderausgaπg or receiver input wherein the metal shield and the antenna of two or more substantially gleichorientierteπ filtered off with angled antenna resonators, and at least two An¬ antenna resonators to a feed line connected and the feed points between the bending edge of the peak areas and the free resonator ends, wherein coaxial Durch¬ guidance for each feed line available and the Speiseleitun¬ gen via a respective transmit and receive filters to the Senderaus¬ gear and receiver input are connected and which to vary the input impedance of the antenna- the distance between the arrival tenπenresonatoreπ in the end considerably smaller than at the bending edge the peak areas is.

p0010Among the advantages of the arrangement according to claim 1 is achieved by the power of two antenna resonators and the connection of the supply lines to transmit and receive filters, a partial decoupling of the transmitter output and the receiver input. Daruberhinaus a separate optimization of transmitter and receiver adjustment is possible.

p0011The antenna can, in principle, on any Sei¬ tenfläche are the shield case. In experiments it has sich.jedoch proven advantageous that the antenna resonators are arranged ange¬ at the top or upper surface of the shield case. For a diversity operation, the antenna of at least two is fed, opposing partial antennas. Both partial antennas may be the same length, it creates double resonance. The antenna consists of lambda / 4 resonators. Therefore, the bandwidth can be further increased when the length of the Antennenresoπatoren is unequal.

p0012A reliable mechanical construction is achieved in that the angled antenna resonators are formed from sheet metal angles. To improve the radiation, it is advantageous that three sheet corners are present and the middle metal bracket is connected to the feed line. To produce the metal parts in a single operation, it is advantageous that the shield and the metal bracket are stamped from a flat sheet metal and bent into the appropriate shape. but it is also possible that the sheet-metal angles, to the shield case soldered or conductively connected to it.

p0013The mechanical strength of the antenna is increased in that the Blechwiπkel have U-shaped longitudinal section and the non-fed, or non-radiation-coupled leg is fastened in a conductive protruding from the shield plate and connected to a ground plane with the shield. A particular strength is achieved by the board between the free resonator ends of the sheet-metal angle towers and the resonator ends are connected to the board. Through these measures, the antenna on the circuit board is integrated.

p0014A special mechanical strength is thereby give ge that the shield is passed by a plastic housing converted to which the metal bracket as a metal foil or outside are applied inside and connected screen housing on a mass implementing the Ab¬.

p0015Daruberhinaus it is also advantageous that the angled antenna resonators are formed from wire angles. These wire angles run such to each other that their free resonator ends are removed almost one another. Here, too, high currents flow and there is a small Impe¬ dancy. The "inverted-F structure" has over the "Inverted-L structure" the advantage of higher goodness of fit to the broadband. The improvement is about 50-100%.

p0016The invention will be explained in more detail with reference to several embodiments and to drawings. In the drawings: Figure 1 is an example with two Blechwinkelπ.

p0017FIG. 2 the plan with the antenna area,

p0018Fig. 3 shows an example with two feed lines,

p0019Fig. 4 shows an example with two sub-antennas,

p0020Fig. 5 shows an example with three antenna resonators, Fig. 6 shows an example of integration on a printed circuit board,

p0021Fig. 7 shows an example with resonators made of metal foil and

p0022Fig. 8 shows an example with resonators of wire angles.

p0023In the following Ausführungsbeis-Pielen antennas are described with two or more angled resonators can be installed in portable equipment such as cordless telephones, cellular phones, pagers, "telepoint devices" etc.. As internal An¬ antenna for a digital cordless telephone is it set to the 1.7 GHz band. The common features are generally just- in the first embodiment stated.

p0024The structure of a first antenna is shown in FIG. 1. In a shield case 1, the two acting as an antenna plate angle 2.3 are attached to the top. The Abschirmge- housing 1 contains all the high-frequency, low frequency and digital electronics of the handset of a cordless phone. Except for the shield meets the shield case 1 also functions as a Erdnachbildung for the antenna and affects the bandwidth. the intervertebral The greater it is, the smaller width. The top of the shield 1 has been found to be more favorable space to install the antenna.

p0025The shield case 1 (or parts thereof) and the sheet-metal angle 2.3 are stamped from a flat sheet metal and bent into shape as shown in FIG. 1. With the first sheet metal angle 2 a feed line 4 is connected, which leads out via a coaxial feedthrough 5 from the inside of the shield case the first The first metal angle 2 is thus the driven element of the antenna, the second metal bracket 3 is coupled to the first radiation plate angle. 2 The feed line 4 is connected within the shield 1 through a duplex filter with a receiver input or transmitter output.

p0026FIG. 2 shows the attachment point of the feed line 4 on the first sheet metal angle 2. The location of this attachment point and the forming environment of the facing edges of the sheet metal angle 2.3 ge equips it to vary the input impedance of the antenna over a large area. The plate angle 2.3 are widened towards the ends. This a matching network between the antenna and the transmitter output and receiver input is saved. The two metal angle 2.3^' have a different length. Due to the consequent different Resonanz¬ the individual radiators frequencies results in a considerable delay Stei¬ bandwidth than a comparable, consisting only of a single sheet metal angle antenna.

p0027An alternative way of connecting the transmitter and receiver to the antenna according to the invention is shown in Fig. 3. The first metal angle 2 is conducted with the first Speise¬., 4, said second metal bracket 3 with a second feed line 6. The feed lines 4,6 are led out via Durchführun¬ gen. 5 The transmitter output is via a transmission filter connected to the first metal bracket. 2 According to the receiver input via a reception filter to the second sheet-metal angle 3 is connected. This type of design is a part of the necessary decoupling of the transmitter output and receiver input is effected. The variation of the input impedance by shaping the metal bracket 2.3 and varying the Be¬ attachment point of the feed lines 4.6 carried out as in the first embodiment.

p0028Fig. 4 shows a Antenπenanordnung for diversity operation. The shield 1 are upstream on the narrow side of two partial antennas. The first part of the antenna consists of the first to Example the metal angles 2.3. The second part of the antenna is built identical auf¬ and consists of Blechwiπkelπ 7.8. Electricity supply for the first partial antenna via the feed line 4 through a coaxial feedthrough 5, for the second part of the antenna is considered appropriate. The length of the resonators is lambda / 4. Both Teilaπtenneπ are equal and there is a Doppelresoπanz.

p0029In the transmitting and receiving device shown in FIG. 5, a third Blechwin¬ Article 9 is between the two sheet metal angles arranged from 2.3 shield 1 ago. Free Resona¬ gate end of the third plate angle -9 is symmetrically widened against the first two plate angle towards 2.3. About the koaxia¬ le carrying 5 the feed line 4 with the third sheet-metal angle 9 is connected. The first two angled sheet 2.3 are radiation-coupled.

p0030In the example of fi g. 6, the shield case 1 consists of two parts and encloses a circuit board 12, on which the components of the device are arranged. The board 12 protrudes on the upper narrow side between the parts of the shield case 1 and is provided with a M; provided sεefläche 14th The antenna consists of sheet metal angles 10,11, which have a U-shaped longitudinal section auf¬. They are connected by a solder joint 13 over the whole length of each lower leg of the metal bracket 10,11 connected to the ground plane 14 and secured to the board 12th Power is supplied via a conductor track by performing 5 in the shield 1 and a recess in the lower leg of the plate angle 10 to feed point 15. Again, the metal bracket 10 is connected to the board 12th If erforder¬ Lich, also the free resonator end to the circuit board 12 can be prevented ver¬. It is both a separate and a ge common feeding the metal bracket 10,11 possible.

p0031In another example of FIG. 7, the shield case 1 is surrounded by a plastic housing 16. The plate angle 2.3 externally sprayed onto the plastic casing 16th It would also be possible herauszuätzen them. From a feeding point 17 of the metal bracket 2 is connected to the transmitter / receiver. About a mass implementing 18 of the contact of the metal angle is 2.3 made with the shield. 1

p0032The antenna of the transmitting and receiving arrangement according to FIG. 8 is made from wire brackets 19,20. They run to each other and are at the free resonator end only slightly from each other ent removed. The wire angle 19,20 are soldered an¬ to the shield case 1, and the second wire 20 is connected via an angle Speiselei¬ device 4 with the transmitter / receiver nger -connected. For this purpose the distance schirmgehause 1 a coaxial feedthrough 5 on. This Draht¬ angle 19,20 are running straight and therefore have a ein¬ fold form. The shield case 1 has no step.