EP3331094B1 - Antenna assembly - Google Patents

Description

The invention relates to an antenna arrangement comprising a patch antenna, an RFID signal interface, a first mobile radio interface and a second mobile radio interface, wherein the patch antenna has a first port, a second port, a third port and a fourth port.

UHF RFID systems are one of the best ways to identify items and track them in real time. Such a system is used for example in DE 20 2011 109 260 U1 described. As soon as a product is marked with an RFID transponder, it can be read out wirelessly and without line of sight using a UHF RFID reader. Thereafter, a unique identification number of this product can be forwarded and is available to various ERP systems. For the forwarding of data such RFID reader devices are often connected via cable connections to data networks. Likewise, it is possible to connect the RFID readers to the data network by means of wireless communication such as WLAN or mobile radio, in particular the GSM, UMTS and LTE mobile radio systems being used in the area of mobile data transfer. Usually, frequencies of the 900 MHz, 1800 MHz and 2100 MHz bands are used for signal transmission.

To read an RFID transponder, an electromagnetic wave is emitted via an RFID antenna controlled by the RFID reader. This electromagnetic wave interacts with the RFID transponder, whereby the identification number of the transponder is detected by the RFID reader. Usually, the RFID readers controlled by the RFID reader are designed as patch antennas. In WO 201069433 A1 such a patch antenna will be described. This is usually designed as a rectangular metal surface and has two or four feed points. By means of a suitable antenna arrangement, a line-bound electromagnetic wave can be distributed to the feed points in such a way that it is emitted at the metal edge as a horizontally, vertically, left-circularly or right-circularly polarized space wave US 2012/0188917 discloses a feed network for an antenna to improve decoupling between transmit and receive channels by means of a signal splitter, two directional couplers or circulators, and a circularly polarized patch antenna, with two separate feed network signal sources feeding the same antenna.

For wireless communication with the data network RFID readers are equipped with WLAN and / or GSM / UMTS / LTE modules. These modules are usually equipped with separate ceramic-based patch or PIF antennas. However, the use of separate antenna structures increases the manufacturing costs and space requirements of the RFID reader. A further disadvantage is that such antennas have a relatively low Have efficiency. Basically, the feeding of UHF RFID signals and mobile signals of the 900 MHz bands in one and the same antenna is problematic because the signals are subject to a strong signal coupling due to the relatively close frequency ranges.

The object of the invention is to provide an antenna arrangement which uses a single antenna element for emitting and receiving UHF RFID signals and mobile radio signals (GSM / UMTS / LTE). In this case, the antenna arrangement should be designed so that UHF RFID signals or mobile radio signals can be radiated and received as left circular, right circular, horizontally or vertically polarized electromagnetic waves.

This object is achieved by the antenna arrangement comprising a signal divider, a first directional coupler, a second directional coupler, a first low pass, a second low pass, a first high pass, a second high pass, a first diplexer and a second diplexer, wherein the signal divider is connected to a first Terminal, a second terminal and a third terminal is formed. The first connection of the signal divider is connected to the RFID signal interface, the second connection of the signal divider to a first connection of the first directional coupler and the third connection of the signal divider to a first connection of the second directional coupler. A second terminal of the first directional coupler is connected to a first terminal of the first diplexer, a second terminal of the second directional coupler to a first terminal of the second diplexer, a third terminal of the first directional coupler to a first terminal of a first low-pass filter, a third terminal of the second directional coupler a first terminal of a second low-pass filter, a fourth terminal of the first directional coupler connected to a first one-sided grounded terminating resistor and a fourth terminal of the second directional coupler to a second unilaterally grounded terminating resistor. A second terminal of the first low-pass filter is connected to the first port and a second terminal of the second low-pass filter to the second port. A second terminal of the first diplexer is connected to the first mobile radio interface and a second terminal of the second diplexer to the second mobile radio interface. A third terminal of the first diplexer is connected to a first terminal of the first high-pass filter, a third terminal of the second diplexer to a first terminal of the second high-pass filter, a second terminal of the first high-pass filter to the fourth port and a second terminal of the second high-pass filter to the third port connected.

With such an antenna arrangement, the patch antenna for emitting and receiving UHF RFID signals and as an antenna for mobile data transfer (GSM / UMTS / LTE). Thus, no additional antenna elements must be provided for the mobile data transfer, which reduces both the manufacturing costs and the space required. Furthermore, the antenna arrangement according to the invention for the mobile data transfer on a higher efficiency than ceramic-based patch or PIF antennas.

A patch antenna with at least two feed points is basically suitable for emitting and receiving left circular, right circular, horizontally or vertically polarized electromagnetic waves. For example, if only the first port is fed with an RFID signal, the wave is radiated vertically polarized. An injection into the second port leads to a horizontally polarized wave. If the signals on the first port and the second port have the same amplitude but a phase difference of 90 °, then the radiated wave will be circularly polarized. Whether the wave is left circular or right circular polarized depends on whether the signal on the first port precedes or follows the signal on the second port.

In an advantageous embodiment, the signal divider is designed as a hybrid coupler. This hybrid coupler may have a fourth port connected to the RFID signal interface. With such a signal splitter, circularly polarized electromagnetic waves can be radiated and received. Depending on whether an RFID signal is fed in at the first connection of the signal divider or at the fourth connection of the signal divider, the signal at the second connection of the signal divider is phase-shifted by + 90 ° or -90 ° against the signal at the third connection of the signal divider. The signals of the second and third terminals of the signal divider directed to the first port and the second port then lead to emission of a left- or right-circularly polarized wave.

Another embodiment provides for the formation of the signal divider as a polarization switch. This has the advantage that it can be chosen between the emission or the reception of a vertical, horizontal, left circular or right circularly polarized wave. With the polarization switch, the signals can only be routed to the first port, only to the second port or to these two ports. In addition, it is still possible to select whether the signal on the first port precedes or follows the signal on the second port.

An advantageous embodiment provides that the polarization switch has a first switch, a second switch, a third switch and a hybrid coupler and the first terminal of the polarization switch with a first terminal the first switch is connected. A second terminal of the first changeover switch is connected to a first terminal of the second changeover switch, a third terminal of the first changeover switch to a first terminal of the third changeover switch, a fourth terminal of the first changeover switch to a first terminal of the hybrid coupler, a fifth terminal of the first changeover switch to one second terminal of the hybrid coupler, a third terminal of the hybrid coupler connected to a second terminal of the second switch and a fourth terminal of the hybrid coupler connected to a second terminal of the third switch. A third terminal of the second switch is connected to the second terminal of the polarization switch and a third terminal of the third switch is connected to the third terminal of the polarization switch.

It is proposed that the patch antenna, the signal divider, the low passes, the high passes, the diplexers and the directional couplers are mounted on a feed circuit board.

In one embodiment, an area of the patch antenna is deposited with a reflector. It is thus achieved that the emission or reception of electromagnetic waves is possible only in or out of a preferred direction.

An advantageous embodiment provides that the low passes have a cutoff frequency of 900 MHz and the high passes have a cutoff frequency of 1800 MHz. Thus, the antenna arrangement is optimized for the transmission or reception of UHF RFID signals and mobile radio signals in the frequency bands 900 MHz, 1800 MHz, 2100 MHz and 2600 MHz.

It is advantageous that the directional couplers have a coupling value between 3 dB and 20 dB, preferably of 10 dB.

It is suggested that the termination resistors are between 10 ohms and 200 ohms, preferably 50 ohms.

Furthermore, it is proposed that the directional coupler and the diplexer are formed as SMD components.

An advantageous embodiment provides that the antenna arrangement has a first WLAN antenna.

It is suggested that the WLAN antenna is etched onto the feed circuit board.

In a further embodiment, the antenna arrangement has a second WLAN antenna.

It is proposed that the first WLAN antenna is rotated by 90 ° against the second WLAN antenna. This antenna diversity is achieved, which is advantageous, for example, to reduce interference. Furthermore, it can be used to implement MIMO applications.

One embodiment provides that the WLAN antennas are slotted patch antennas.

It is advantageous if the WLAN antennas are designed for transmitting or receiving electromagnetic waves with frequencies of 2.4 GHz and 5 GHz.

Furthermore, it is proposed that the supply circuit board has freely programmable display elements, wherein in one embodiment the display elements are designed as light-emitting diodes.

Fig. 1

Blockschaltbild einer erfindungsgemäßen Antennenanordnung

Fig. 2

Blockschaltbild eines Signalteilers

Fig. 3

Ausführungsform der Antennenanordnung in perspektivischer Ansicht

Fig. 4

Weitere Ausführungsform der Antennenanordnung in perspektivischer Ansicht

Hereinafter, embodiments of the invention will be explained with reference to the drawings.

Fig. 1

Block diagram of an antenna arrangement according to the invention

Fig. 2

Block diagram of a signal divider

Fig. 3

Embodiment of the antenna arrangement in a perspective view

Fig. 4

Further embodiment of the antenna arrangement in a perspective view

Fig. 1 This consists of a patch antenna 2, a signal splitter 3, a first directional coupler 4, a second directional coupler 5, a first low pass 6, a second low pass 7, a first high pass 8, a second high pass 9 , a first diplexer 10 and a second diplexer 11. The antenna arrangement 1 can be connected via an RFID signal interface 12 to an RFID signal generator and / or an RFID signal processor. Via a first mobile radio interface 13 and a second mobile radio interface 14, the antenna arrangement 1 is connected to a mobile radio signal generator and / or a mobile radio signal processor (eg mobile radio data modem). Conventional mobile radio data modems have, for example, two antenna ports (mobile radio interfaces) for antenna diversity or for MIMO applications. With the invention Antenna arrangement 1 can be emitted or received on the patch antenna 2 RFID signals. In addition, the patch antenna 2 of this antenna arrangement 1 is also suitable for data transfer via different mobile radio standards of the generations 2G, 3G or 4G (GSM, UMTS, LTE). The mobile radio standards use different frequency bands, which can be divided into two areas. A first range consists of frequency bands less than 1 GHz and a second range of frequency bands greater than 1.5 GHz.

The antenna arrangement 1 can thus be used for reading out an identification number of one or more RFID transponders and for forwarding the acquired data to a data network. For this purpose, a cable-bound RFID signal generated by the RFID signal generator is emitted by the patch antenna 2 as an electromagnetic space wave. This wave interacts with the RFID transponder, whereby the RFID transponder emits an electromagnetic wave with a coded identification number. This wave in turn interacts with the patch antenna 2 and is passed as a line-connected wave to the RFID signal processor, which decodes the identification number. Subsequently, this identification number can be transferred to the mobile signal processor. This encodes the identification number in an electromagnetic wave according to one of the said mobile radio standards. At the patch antenna 2, this conducted wave is then radiated as a space wave. From another mobile modem, this wave can then be received, decoded and transferred to a data network.

The patch antenna 2 is formed with a first port P1, a second port P2, a third port P3 and a fourth port P4. The signal divider 3 has a first terminal, a second terminal and a third terminal, wherein the first terminal of the signal divider 3 with the RFID signal interface 12, the second terminal of the signal divider 3 with a first terminal of the first directional coupler 4 and the third terminal of the signal divider 3 are connected to a first terminal of the second directional coupler 5. A second terminal of the first directional coupler 4 is connected to a first terminal of the first diplexer 10, a second terminal of the second directional coupler 5 to a first terminal of the second diplexer 11, a third terminal of the first directional coupler 4 to a first terminal of a first low-pass filter 6 third connection of the second directional coupler 5 to a first terminal of a second low-pass filter 7, a fourth terminal of the first directional coupler 4 connected to a first one-sided grounded terminal resistor 15 and a fourth terminal of the second directional coupler 5 to a second one-sided grounded termination resistor 16. A second connection of the first Low pass 6 is connected to the first port P1 of the patch antenna 2, a second port of the second low pass 7 to the second port P2 of the patch antenna 2, a second port of the first diplexer 10 to the first mobile radio interface 13 and a second port of the second Diplexers 11 connected to the second mobile radio interface 14. Furthermore, a third terminal of the first diplexer 10 at a first terminal of the first high-pass filter 8, a third terminal of the second diplexer 11 at a first terminal of the second high-pass filter 9, a second terminal of the first high-pass filter 8 at the fourth port P4 of the patch antenna 2 and a second terminal of the second high-pass filter 9 is connected to the third port P3 of the patch antenna 2.

The patch antenna 2 is optimized for radiating UHF RFID signals and thus has its main radiation mode at 900MHz and the second higher mode at 1800MHz (2100MHz). As a consequence, the patch antenna 2 can emit or receive signals for these frequencies very well.

The directional couplers 4, 5 have a coupling value between 3 dB and 20 dB, preferably of 10 dB. The terminating resistors 15, 16 are between 10 ohms and 200 ohms, preferably 50 ohms. The low passes 6, 7 have a cutoff frequency of 900 MHz and the high passes 8, 9 a cutoff frequency of 1800 MHz.

If mobile radio signals are supplied to the antenna arrangement 1 via the first mobile radio interface 13 and the second mobile radio interface 14, these signals are first fed to the first diplexer 10 or second diplexer 11. At these diplexers 10, 11 the signals are divided according to their frequencies into sub-signals with frequencies in the range of 900 MHz into a 900 MHz group and into sub-signals with frequencies in the range 1800-2100 MHz in an 1800/2100 MHz group. Such diplexers 10, 11 are known to the skilled person as crossovers and are not explained in detail. The signals of the 1800/2100 MHz group from the first diplexer 10 are then fed via the first high pass 8 to the fourth port P4 of the patch antenna 2. The third port P3 of the patch antenna 2 is fed with signals of the 1800/2100 MHz group, which have previously passed the second high pass 9. The signals of the 900 MHz group are conducted in the first and second diplexers 10, 11 respectively at their first terminal and then fed to the first directional coupler 4 and the second directional coupler 5. Via the respectively third connection of the first and second directional coupler 4, 5, the signals of the 900 MHz group are then conducted via the first and the second low pass 6, 7 to the first port P1 and the second port P2 of the patch antenna 2, respectively ,

RFID signals which have been supplied to the antenna arrangement 1 via the RFID signal interface 12 are conducted by the signal divider 3 to its second and third terminals. Depending on the design of the signal divider 3, partial signals are conducted only on the second, only on the third or on these two terminals. Partial signals from the second terminal of the signal divider 3 are supplied to the first directional coupler 4 and via the downstream first low-pass filter 6 to the first port P1 of the patch antenna 2. Partial signals from the third terminal of the signal divider 3 are supplied to the second directional coupler 5 and via the downstream second low-pass filter 7 to the second port P2 of the patch antenna 2. Thus, both the signals of the 900 MHz group of the first diplexer 10 and the RFID sub-signals of the second terminal of the signal divider 3 are conducted to the first port P1 of the patch antenna 2. Likewise, the signals of the 900 MHz group of the second diplexer 11 and the RFID sub-signals of the third terminal of the signal divider 3 are fed to the second port P2 of the patch antenna 2. However, since the signals of the 900 MHz group and the RFID sub-signals are conducted via a directional coupler 4, 5, a high decoupling between RFID signals and the mobile radio signals of the 900 MHz group is achieved due to the decoupling of the input ports of the directional coupler 4, 5.

If the signals of the 900 MHz group were fed directly into the third port P3 or fourth port P4 without the interposition of a directional coupler 4, 5, no decoupling between the RFID signals and the mobile radio signals of the 900 MHz group would be achieved because the opposite ports P1 and P3, and P2 and P4 of the patch antenna 2 are strongly coupled. Accordingly, a large part of the power of the mobile radio signals would be fed into the RFID signal interface 12 and thus into the RFID signal generator or the RFID signal processor, whereby the RFID signal processor would no longer be able to detect the weak response signals from the RFID transponder. The attenuation of the signals of the 900 MHz group by the directional coupler 4, 5 by its coupling factor is offset by the higher gain (greater than 8dBi) of the patch antenna 2 again. The frequencies of the 1800/2100 MHz group are far removed from the frequencies of the UHF RFID signals, which already provides a large decoupling between these signals.

The antenna arrangement according to the invention is suitable for transmitting and receiving UHF RFID signals and mobile radio signals.

Fig. 2 shows a block diagram of a possible embodiment of the signal divider 3 as a polarization switch. This has a first changeover switch 17, a second changeover switch 18, a third changeover switch 19 and a hybrid coupler 20. The first connection of the Polarization switch is connected to a first terminal of the first switch 17. A second terminal of the first changeover switch 17 is at a first terminal of the second changeover switch 18, a third terminal of the first changeover switch 17 at a first terminal of the third changeover switch 19, a fourth terminal of the first changeover switch 17 at a first terminal of the hybrid coupler 20, a fifth Connecting the first switch 17 to a second terminal of the hybrid coupler 20, a third terminal of the hybrid coupler 20 at a second terminal of the second switch 18 and a fourth terminal of the hybrid coupler 20 connected to a second terminal of the third switch 19. A third terminal of the second changeover switch 18 is connected to the second terminal of the polarization changeover switch and a third terminal of the third changeover switch 19 is connected to the third terminal of the polarization changeover switch.

Depending on the position of the first changeover switch 17, the second changeover switch 18 and the third changeover switch 19, an RFID signal fed in via the first connection of the polarization changeover switch can either only contact the second connection of the polarization connection or only the third connection of the polarization changeover switch or both in the latter case, a phase shift of the signals at the second and third terminal of 90 ° is achieved. Depending on the position of the switches 17, 18, 19, the phase shift can be set up so that the signal at the second output of the polarization switch ahead of the signal at the third output of the polarization switch or vice versa.

The following examples are intended to further clarify the mode of operation of the polarization switcher.

Example 1: A signal (in the form of a line-connected electromagnetic wave), which is passed from the first terminal of the polarization switch to the first terminal of the first switch 17, is passed from the first switch 17 to its second terminal. From this, the signal to the first terminal of the second switch 18 is guided, said second switch 18, the signal passes to its third terminal and thus to the second terminal of the polarization switch. Thus, a signal is applied only to the second terminal of the polarization switch. Thus, only the first port P1 is fed, whereby at the patch antenna 2, a vertically polarized space wave is emitted.

Example 2: A signal, which is passed from the first terminal of the polarization switch to the first terminal of the first switch 17, is from the first switch 17 led to its fifth connection. Thus, the signal is fed to the second terminal of the hybrid coupler 20. Within the hybrid coupler 20, the signal is then distributed in two partial signals to the third and fourth connection of the hybrid coupler 20, wherein a phase difference of 90 ° exists between the two component signals. Both partial signals have half the amplitude compared to the signal at the second terminal of the hybrid coupler 20. The construction and the application of a hybrid coupler 20 for such a circuit are familiar to those skilled in the art and will not be further elaborated here. The partial signal from the third terminal of the hybrid coupler 20 is fed to the second terminal of the second changeover switch 18. The second switch 18 is placed so that this signal is then passed to the third terminal of the second switch 18 and thus to the second terminal of the polarization switch. The partial signal from the fourth terminal of the hybrid coupler 20 is passed to the second terminal of the third switch 19 and guided by the third switch 19 via the third terminal of this switch 19 to the third terminal of the polarization switch. As a result, signals are applied to the second and third terminals of the polarization switch, which are phase-shifted by 90 ° from one another. Thus, the first port P1 and the second port P2 are fed with signals phase-shifted by 90 °, so that a circularly polarized space wave is emitted at the patch antenna 2.

In principle, it is also possible to form the signal divider 3 only as a hybrid coupler, in which case the signal divider 3 has a further fourth connection. The first connection and the fourth connection of the signal divider are connected to the RFID signal interface 12. If an RFID signal is fed from the RFID signal interface 12 to one of these two ports, the signal within the signal divider 3 is split into two sub-signals and fed to the second and third ports of the signal divider 3, the sub-signals at the second and third ports of the signal divider 3 then phase-shifted by 90 °. Whether the sub-signal at the second port precedes the sub-signal at the third port depends on whether the signal is input to the first or fourth port of the signal divider.

Fig. 3 shows a possible embodiment of the antenna assembly 1. The patch antenna 2 is mounted on a feed circuit board 21. One side of the feed circuit board 21 is deposited with a reflector 22. The signal divider 3, the low-pass filters 6, 7, the high-passes 8, 9, the diplexers 10, 11 and the directional couplers 4, 5 are mounted on the feed circuit board 21. However, these components are not shown in the figure. The directional couplers 4, 5 and the diplexers 10, 11 may be formed, for example, as SMD components.

Fig. 4 shows a further embodiment of the antenna arrangement 1. Analogous to Fig. 3 The antenna arrangement 1 has the patch antenna 2, the feed circuit board 21 and the reflector 22. On the supply board 21, a first WLAN antenna 23 and freely programmable display elements 24 are further attached. Advantageously, the WLAN antenna 23 can be etched directly onto the feed circuit board 21. The display elements 24 may be formed, for example, as light emitting diodes. The WLAN antenna 23 is designed as a slotted patch antenna, the dimensions of which are designed for emitting electromagnetic waves at frequencies of 2.4 GHz and 5 GHz. Basically, however, the WLAN antenna 23 is not limited to a patch antenna. Depending on the application, the antenna arrangement may comprise a second WLAN antenna. This is not shown. Ideally, the second WLAN antenna is rotated by 90 ° against the first WLAN antenna 23, although this is not absolutely necessary.

Reference number list

1

antenna array

2

Patch antenna

3

signal splitter

4

first directional coupler

5

second directional coupler

6

first low pass

7

second low pass

8th

first high pass

9

second high pass

10

first diplexer

11

second diplexer

12

RFID signal interface

13

first mobile radio interface

14

second mobile radio interface

15

first terminator

16

second terminator

17

first switch

18

second switch

19

third switch

20

hybrid

21

Dining board

22

reflector

23

WLAN antenna

24

display element

P1

first port

P2

second port

P3

third port

P4

fourth port

Claims (16)

1. Antenna assembly consisting of
   a patch antenna (2), a RFID signal interface (12), a first mobile radio interface (13) and a second mobile radio interface (14), wherein
   the patch antenna features a first port (P1), a second port (P2), a third port (P3) and a fourth port (P4), characterized in that
   the antenna assembly (1) features a signal splitter (3), a first directional coupler (4), a second directional coupler (5), a first low-pass filter (6), a second low-pass filter (7), a first high-pass filter (8), a second high-pass filter (9), a first diplexer (10) and a second diplexer (11);
   and the signal splitter (3) is designed with a first port, a second port and a third port, wherein the first port of the signal splitter (3) is connected to the RFID signal interface (12), the second port of the signal splitter (3) is connected to a first port of the first directional coupler (4) and the third port of the signal splitter is connected to a first port of the second directional coupler (5); and
   a second port of the first directional coupler (4) is connected to a first port of the first diplexer (10), a second port of the second directional coupler (5) is connected to a first port of the second diplexer (11), a third port of the first directional coupler (4) is connected to a first port of the first low-pass filter (6), a third port of the second directional coupler (5) is connected to a first port of a second low-pass filter (7), a fourth port of the first directional coupler (4) is connected to a first terminating resistor earthed on one side (15) and a fourth port of the second directional coupler (5) to a second terminating resistor earthed on one side (16); and
   a second port of the first low-pass filter (6) is connected to the first port (P1) and a second port of the second low-pass filter (7) is connected to the second port (P2); and a second port of the first diplexer (10) is connected to the first mobile radio interface (13) and a second port of the second diplexer (11) is connected to the second mobile radio interface (14); and
   a third port of the first diplexer (10) is connected to the first high-pass filter (8), a third port of the second diplexer (11) is connected to a first port of the second high-pass filter (9), a second port of the first high-pass filter (8) is connected to the fourth port (P4) and a second port of the second high-pass filter (9) is connected to the third port (P3).
2. Antenna assembly according to claim 1, characterized
   in that the signal splitter (3) is a hybrid coupler.
3. Antenna assembly according to claim 1, characterized
   in that the signal splitter (3) is designed as a polarization toggle switch.
4. Antenna assembly according to claim 3, characterized
   in that the polarization switch features a first toggle switch (17), a second toggle switch (18), a third toggle switch (19) and a hybrid coupler (20); and in that the first port of the polarization toggle switch is connected to a first port of the first toggle switch (17); and in that a second port of the first toggle switch (17) is connected to a first port of the second toggle switch (18), a third port of the first toggle switch (17) is connected to a first port of the third toggle switch (19), a fourth port of the first toggle switch (17) is connected to a first port of the hybrid coupler (20), a fifth port of the first toggle switch (17) is connected to a second port of the hybrid coupler (20), a third port of the hybrid coupler (20) is connected to a second port of the second toggle switch (18) and a fourth port of the hybrid coupler (20) is connected to a second port of the third switch (19); and in that a third port of the second toggle switch (18) is connected to the second port of the polarization toggle switch and a third port of the third toggle switch (19) is connected to the third port of the polarization toggle switch.
5. Antenna assembly according to claim 1, characterized
   in that the patch antenna (2), the signal splitter (3), the low-pass filters (6, 7), the high-pass filters (8, 9), the diplexers (10, 11) and the directional couplers (4, 5) are mounted on a power-supply circuit board (21).
6. Antenna assembly according to claim 1, characterized in that an area of the patch antenna (2) is backed by a reflector (22).
7. Antenna assembly according to claim 1, characterized
   in that the low-pass filters (6, 7) feature a threshold frequency of 900 MHz and the high-pass filters (8, 9) feature a threshold frequency of 1800 MHz.
8. Antenna assembly according to claim 1, characterized
   in that the directional couplers (4, 5) feature a coupling value between 3 dB and 20 dB, preferably 10 dB.
9. Antenna assembly according to claim 1, characterized
   in that the terminating resistors (15, 16) are between 10 ohm and 200 ohm, preferably 50 ohm.
10. Antenna assembly according to claim 1, characterized
    in that the directional couplers (4, 5) and the diplexers (10, 11) are designed as SMD components.
11. Antenna assembly according to claim 1, characterized
    in that the antenna assembly (1) features at least one Wi-Fi antenna (23).
12. Antenna assembly according to claim 11, characterized
    in that the Wi-Fi antenna (23) is etched on to the power-supply circuit board (21).
13. Antenna assembly according to claim 11, characterized
    in that where there are several Wi-Fi antennae (23), at least two Wi-Fi antennae (23) are oriented at 90° to one another.
14. Antenna assembly according to claim 11, characterized
    in that the Wi-Fi antenna (23) is a slotted patch antenna.
15. Antenna assembly according to claim 11, characterized
    in that the Wi-Fi antenna (23) is suitable for the frequencies 2.4 GHz and 5 GHz.
16. Antenna assembly according to claim 5, characterized
    in that the power-supply circuit board (21) features freely programmable display elements (24).

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