DE102009038148A1 - Triplexer for a multiband antenna module of a vehicle - Google Patents

Abstract

The invention relates to a triplexer (1) for a multiband antenna module of a vehicle. For this purpose, the triplexer (1) has a single antenna connection (3) to a multiband antenna of the multiband antenna module. The triplexer (1) also has three frequency band connections (4, 5, 6) or ports for connecting services in the gigahertz range. A first frequency band connection (4) is provided for a frequency band in the gigahertz range with higher resonance frequencies (f) than the following connections (5, 6). A second frequency band connection (5) is provided for a frequency band in the gigahertz range with higher resonance frequencies (f) than the following connection (6) and lower resonance frequencies (f) than the first frequency band connection (4). A third frequency band connection (6) is provided for a frequency band in the gigahertz range with lower resonance frequencies (f), f) than the second frequency band connection (5). For this purpose, the triplexer (1) has a planar coupling structure (9) on a planar ceramic plate (8) with ring resonators (10) and / or with quarter-wavelength coupling elements (11 to 15) and with short-circuited or open stub lines (16 to 22) and with interdigital Filter circles (23, 24, 25).

Description

The invention relates to a triplexer for a multiband antenna module of a vehicle. For this purpose, the triplexer has a single antenna connection to a broadband or multiband antenna of the multiband antenna module. In addition, the triplexer has three frequency band connections or ports for connecting services in the Gigaherzbereich. A first frequency band connection is provided for a frequency band in the gigahertz range with higher resonance frequencies than the following connections. A second frequency band connection is provided for a frequency band in the gigahertz range with higher resonance frequencies than the subsequent connection and lower resonance frequencies than the first frequency band connection. A third frequency band connection is provided for a frequency band in the gigahertz range with lower resonance frequencies than the second frequency band connection.

Such a triplexer with a multilayer structure is known from the document US Pat. No. 6,876,840 B2 known. The known triplexer comprises a first filter circuit and a low-pass filter circuit connected in parallel to an input terminal, and a second filter circuit and a third filter circuit connected in parallel to an output terminal of the low-pass filter circuit. The first filter circuit passes a signal for a first frequency band, and the low-pass filter circuit passes a signal of a predetermined frequency band that is lower than the first frequency band. The second filter circuit extracts a signal of a second frequency band from the predetermined frequency band signal and the third filter circuit extracts a signal of a third frequency band from the predetermined frequency band signal, the third frequency band being lower than the second frequency band. The low-pass filter circuit includes a circuit for expanding a portion of the predetermined frequency band adjacent to the first frequency band. According to the invention, the triplexer may split an input signal received from an input terminal into signals of the first, second and third frequency bands.

In order to realize such a triplexer, a complex structure is arranged on several layers and with vias this block is provided by several layers in order to realize the connections of the triplexer. Such a triplexer thus has the disadvantage that it is costly associated with very high manufacturing costs, especially since each individual layer of the multilayer structure must be adjusted to each other and each other and is provided with vias to realize the external connections of the triplexer.

The object of the invention is to overcome the disadvantages of the prior art and to propose a structure of a triplexer which can be produced with as few process steps as possible and can be integrated into a flat multiband antenna module.

This object is achieved with the subject matter of independent claim 1. Further advantageous embodiments are disclosed by the dependent claims.

According to the invention, a triplexer for a multiband antenna module for vehicles is provided. For this purpose, the triplexer has a single antenna connection to a broadband antenna or a multi-band antenna of the multiband antenna module. In addition, the triplexer has three frequency band connections or ports for connecting services in the Gigaherzbereich. A first frequency band connection is provided for a frequency band in the gigahertz range with higher resonance frequencies than the following connections. A second frequency band connection is provided for a frequency band in the gigahertz range with higher resonance frequencies than the subsequent connection and lower resonance frequencies than the first frequency band connection. A third frequency band connection is provided for a frequency band in the gigahertz range with lower resonance frequencies than the second frequency band connection. For this purpose, the triplexer on a planar ceramic plate on a planar coupling structure with ring resonators and / or with quarter-wavelength coupling elements and short-circuited or open stubs and with interdigital filter circuits, such as interlocking capacitors on.

By using a planar ceramic plate with a planar coupling structure, the ring resonators and / or quarter-wavelength coupling elements and shorted or open stubs and interdigital filter circuits, can realize a very flat constructed planar triplexer and provided with external connections to corresponding leads and leads or can be connected directly to the transceiver.

In a preferred embodiment of the invention, the antenna connection is electrically connected to a first branch on the triplexer. This first branch has a first coupling strand to the first frequency band connection and a connection line to a second branch, wherein the first coupling strand is provided for a frequency band with the highest occurring frequencies in the triplexer.

For this purpose, the first coupling line has two series-connected interdigital first and second filter circuits with downstream stubs. The outgoing from the first branch further connecting line in turn preferably has two stubs, wherein the connecting line supplies a quarter-wavelength filter to which a second and a third coupling line for the second frequency band terminal and for the third frequency band terminal are connected.

The second coupling line has an interdigital third filter circuit for the second frequency band connection. This third filter circuit is required in order to transmit lower resonance frequencies with respect to the first coupling strand and to ensure a corresponding decoupling between the first and the second frequency band.

In the second coupling line, three further branch lines are provided between the third interdigital filter circuit and the second frequency band connection. These stubs can be grounded at their ends.

The third coupling line between the second branch with the quarter-wavelength filter and the third frequency band connection forms a conductor track with conductor track elements arranged at right angles to each other, four of which represent identical coupling filter elements connected in series.

With the help of the triplexer, it has even been possible to transmit resonance frequencies in the subgigahertz range of 0.8 GHz for a telephone antenna over the third coupling line. In detail, the first frequency band connection couples a WLAN IEEE 802.16 a / p - Service with resonance frequencies f _a between 5.15 GHz ≤ f _a ≤ 5.925 GHz frequency selective over the first coupling line and the first branch with the antenna port.

The second frequency band connection couples a WLAN IEEE 802.11 b / g - Service with resonance frequencies f _b between 2.4 GHz ≤ f _b ≤ 2.485 GHz frequency selective over the second coupling line and the first and second branch with the antenna port.

Finally, the third frequency band connection couples a telephone / long range ( _LR ) service with resonant frequencies f _T and f _LR between 0.824 GHz ≤ f _LR ≤ 0.96 GHz and between 1.71 GHz ≤ f _LR ≤ 2, 2 GHz frequency-selective over the third coupling line and the first and second branching with the antenna port.

The decoupling to unwanted frequency band connections should be better than 15 dB.

A transmission factor TMF between antenna connection of the triplexer and one of the frequency band connections lies between -2 dB ≦ TMF ≦ 0 dB.

While on the one side of the ceramic substrate only a single antenna port for the above Frequnenzbereiche for sending and receiving is connected to the triplexer, adapted to the three frequency band connections according to the different frequency bands Tranceivers be connected. The adjustment is better than -10 dB with respect to 50 ohms at each of the frequency band connections.

In addition, the triplexer can preferably be contacted via strip lines at its frequency band connections.

The invention will now be explained in more detail with reference to the accompanying figures.

1 shows a schematic plan view of a triplexer according to a first embodiment of the invention;

2 shows a schematic plan view of a triplexer according to a second embodiment of the invention;

3 shows a schematic block diagram of a triplexer in cooperation with an antenna of a multi-band antenna module and three communication services in the gigahertz range.

1 shows a schematic plan view of a triplexer 1 according to a first embodiment of the invention. This triplexer 1 is planar and its planar coupling structure 9 is on a ceramic plate 8th applied. The ceramic plate 8th points to a top edge 39 an antenna connection 3 which can be connected, for example, to a planar inverted F antenna or a dipole antenna of a multiband antenna module. With the help of the triplexer according to the invention 1 can with the antenna connection 3 a first frequency band connection 4 for a frequency band in the gigahertz range with higher resonance frequencies than the downstream frequency band connections 5 and 6 of the triplexer 1 get connected.

A second frequency band connection 5 is for a frequency band in the gigahertz range with higher resonance frequencies than the third frequency band connection 6 provided and has lower resonance frequencies than the first Frequency band Connection 4 on. The third frequency band connection 6 is for a frequency band in the gigahertz range with lower resonance frequencies than the second frequency band connection 5 and thus also for lower resonance frequencies than the first frequency band connection 4 intended.

Accordingly, also different coupling strands 27 . 30 and 31 to the different frequency band connections 4 . 5 and 6 intended. To these frequency band connections 4 . 5 and 6 of the triplexer 1 appropriately designed transceivers can be connected. The dimensions of such a ceramic plate depend on the relative permittivity of the ceramic material. Dimensions of 5 mm × 5 mm or 30 mm × 30 mm are possible.

The first frequency band connection 4 is over the coupling string 27 with the only antenna connection 3 connected. For this purpose, the coupling strand 27 two interdigital filter circuits 23 and 24 , For example, interlocking capacitors, on each of which a stub 16 and 17 assigned.

Before the interdigital filter circuit 23 is a branch 26 arranged, on the one hand the coupling strand 27 to the first frequency band connection 4 go off and on the other a connection line 28 to the other decoupling strands 30 and 31 for frequency bands with lower resonance frequencies than the frequency band connection 4 leads.

For a frequency selection are already on the connection line 28 stubs 18 and 19 arranged, the connecting line 28 then goes into a λ / 4 filter, which at the same time the second branch 29 this triplexer 1 represents. The coupling string 30 for the frequency band connection 5 initially has an interdigital filter circuit 25 For example, an interdigitated capacitor on.

Between the interdigital third filter circuit 25 for the second coupling train 30 and the second frequency band connection 5 are three more stub lines 20 . 21 and 22 arranged, which has a common corresponding band filter for the second frequency band connection 5 form.

Because the third frequency band connection 6 in this embodiment of the invention for extremely low resonant frequencies compared to the frequency band connection 4 is provided, which are partially below one gigahertz, here is the third coupling strand 31 with four coupling elements 12 . 13 . 14 and 15 a trace 32 Mistake. This ensures that a clear decoupling of the first two coupling strands 27 and 30 is reached and on the other a good frequency selection.

2 shows a schematic plan view of a triplexer 2 according to a second embodiment of the invention. Components with the same functions as in 1 are denoted by like reference numerals and will not be discussed separately. The difference of this embodiment of the triplexer 2 according to the first embodiment according to 1 consists essentially in the fact that here partially instead of λ / 4 filters or λ / 4 resonators a circular resonator 10 is used, the one hand, the second branch 29 in the triplexer 2 allows and on the other hand, a frequency filtering effect in the second coupling train 30 represents. The third coupling strand 31 has in this second embodiment of the invention, only three coupling filter elements, but also sufficient to clear frequency selection for the third frequency band connection 6 to achieve.

3 shows a schematic block diagram of a triplexer in cooperation with an antenna 7 a multiband antenna module 40 , The antenna 7 may represent a planar inverted F-antenna or a dipole-type antenna or a patch antenna, in which case telephone frequency bands and long-range frequency bands together with WLAN frequency bands by a single antenna 7 can be radiated and received. This is the triplexer 1 via the antenna connection 3 with the antenna 7 connected. The individual frequency ranges here with this antenna 7 can be radiated or received are already discussed in detail above and are not repeated here again.

To the triplexer 1 are arranged according to transceivers intended for the WLAN a / b service and with the frequency band connection 4 interact while a corresponding transceiver for the WLAN b / g service with the frequency band connection 5 interacts. For a third frequency band connection 6 of the triplexer 1 With the lowest resonant frequencies, a transceiver is also provided that covers the frequency ranges of the telephone services and the long-range services.

Such a triplexer 1 is characterized by being in its preferred embodiment with interdigital filter circuits 23 . 24 . 25 , several quarter wavelength coupling elements 11 to 15 and shorted or open stubs 16 to 22 is realized, as it already is 1 showed. These line structures are applied to the ceramic substrate shown there. With these coupling structures on the ceramic substrate On the one hand, high signal frequencies can first be decoupled or coupled in, so that initially a WLAN service at 5.15 GHz to 5.925 GHz is decoupled and then a WLAN service at 2.4 GHz to 2.48 GHz is switched off - or coupled and finally a telephone signal or a long-range signal off or coupled, as mentioned above.

The adjustment is based on a 50 ohm connection at each of the frequency band connections 4 . 5 and 6 better than -10 dB. The desired transmission factors TMF between the antenna connection 3 and one of the service connections or frequency band connections 4 . 5 . 6 are between -2 dB and 0 dB. On the other hand, the decoupling between the service connections is better than 15 dB. To the triplexer 1 For example, strip lines may be contacted and a preferred size has an area of 33 mm x 30 mm.

LIST OF REFERENCE NUMBERS

1

Triplexer (1st embodiment)

2

Triplexer (2nd embodiment)

3

antenna connection

4

first frequency band connection (or port)

5

second frequency band connection (or port)

6

third frequency band connection (or port)

7

antenna

8th

planar ceramic plate

9

planar coupling structure

10

ring resonator

11-15

coupling element

16-22

stubs

23

interdigital filter circuit

24

interdigital filter circuit

25

interdigital filter circuit

26

first branch

27

first coupling strand

28

connecting line

29

second branch

30

second coupling strand

31

third coupling strand

32

conductor path

39

top edge

40

Multiband antenna module

f _a

Resonant frequencies of a first frequency band

f _b

Resonant frequencies of a second frequency band

f _T

Resonance frequencies of a third frequency band for telephone

f _LR

Resonant frequencies of a third frequency band for long range

TMF

transmission factor

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 6876840 B2 [0002]

Cited non-patent literature

• IEEE 802.16 a / p [0013]
• IEEE 802.11b / g [0014]

Claims (16)

Triplexer for a multiband antenna module ( 40 ) of a vehicle having - a single antenna connection ( 3 ) to a multi-band antenna or a dipole-type antenna ( 7 ) of the multiband antenna module; A first frequency band connection ( 4 ) for a frequency range in the gigahertz range with higher resonance frequencies (f _a ) than the following connections ( 5 . 6 ); A second frequency band connection ( 5 ) for a frequency band in the gigahertz range with higher resonance frequencies (f _b ) than the following connection ( 6 ) and lower resonance frequencies (f _b ) than the first frequency band connection ( 4 ); A third frequency band connection ( 6 ) for a frequency band in the gigahertz range with lower resonance frequencies than the second frequency band connection ( 5 ); wherein a planar ceramic plate ( 8th ) a planar coupling structure ( 9 ) with ring resonators ( 10 ) and / or with quarter wavelength coupling elements ( 11 to 15 ) and with shorted or open stubs ( 16 to 23 ) as well as with interdigital filter circuits ( 23 . 24 . 25 ) having. Triplexer according to Claim 1, characterized in that the interdigital filter circuits ( 23 . 24 . 25 ) are formed as interlocking capacitors. Triplexer according to Claim 1 or Claim 2, characterized in that the antenna connection ( 3 ) with a first branch ( 26 ) on the triplexer ( 1 ) is electrically connected, wherein the first branch ( 26 ) a first coupling string ( 27 ) to the first frequency band connection ( 4 ) and a connection line ( 28 ) to a second branch ( 29 ) having. Triplexer according to claim 3, characterized in that the first coupling strand ( 27 ) two interdigitated first and second filter circuits ( 23 . 24 ) with downstream stubs ( 16 . 17 ) having. Triplexer according to Claim 3 or Claim 4, characterized in that the connecting line ( 28 ) two stubs ( 18 . 19 ) and a λ / 4 filter ( 11 ), to which a second and a third coupling strand ( 30 . 31 ) for the second frequency band connection ( 5 ) or the third frequency band connection ( 6 ) are connected. Triplexer according to claim 5, characterized in that the second coupling strand ( 30 ) for the second frequency band connection ( 5 ) an interdigital third filter circuit ( 25 ) having. Triplexer according to claim 6, characterized in that in the second coupling strand ( 30 ) between the third interdigital capacitor ( 25 ) and the second frequency band connection ( 5 ) three more branch lines ( 19 . 20 . 21 ) are arranged. Triplexer according to one of claims 3 to 7, characterized in that the third coupling strand ( 31 ) between the second branch ( 29 ) with the λ / 4 filter ( 11 ) and the third frequency band connection ( 6 ) a conductor track ( 32 ) with four coupling elements ( 12 to 15 ) having. Triplexer according to Claim 3 or Claim 4, characterized in that the first frequency band connection ( 4 ) a WLAN IEEE 802.16 a / p service with resonance frequencies f _a between 5.15 GHz ≤ f _a ≤ 5.925 GHz frequency-selective over the first coupling path ( 27 ) and the first branch ( 26 ) with the antenna connection ( 3 ) couples. Triplexer according to Claim 3 or Claim 4, characterized in that the second frequency band connection ( 5 ) a WLAN IEEE 802.11 b / g service with resonance frequencies f _b between 2.4 GHz ≤ f _b ≤ 2.485 GHz frequency-selective over the second coupling path ( 30 ) and the first and second branches ( 26 . 29 ) with the antenna connection ( 3 ) couples. Triplexer according to Claim 3 or Claim 4, characterized in that the third frequency band connection ( 6 ) a Tel./LR service with resonance frequencies f _T and f _LR between 0.824 GHz ≤ f _LR ≤ 0.96 GHz and between 1.71 GHz ≤ f _LR ≤ 2.2 GHz frequency-selective over the third coupling line ( 31 ) and the first and second branches ( 26 . 29 ) with the antenna connection ( 3 ) couples. Triplexer according to claim 6, characterized in that the decoupling to unwanted frequency band connections ( 4 . 5 . 6 ) is better than 15 dB. Triplexer according to claim 6, characterized in that a transmission factor TMF between antenna connection ( 3 ) of the triplexer ( 1 ) and one of the frequency band connections ( 4 . 5 . 6 ) is between -2 dB ≦ TMF ≦ 0 dB. Triplexer according to Claim 6, characterized in that the frequency band connections ( 4 . 5 . 6 ) adapted transceivers are connected. Triplexer according to Claim 6, characterized in that the matching with respect to 50 ohms at each of the frequency band connections ( 4 . 5 . 6 ) is better than -10 dB. Triplexer according to claim 6, characterized in that the triplexer ( 1 ) is contactable via strip lines.

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