JP2001267808A - Antenna sharing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide antenna sharing equipment allowed to be reduced at its size and cost as compared with conventional equipment without reducing electric characteristics. SOLUTION: In the antenna sharing equipment having a 1st band pass filter(BPF) constituted of a TM01δ mode dielectric resonator type BPF and capable of passing a transmitting wave whose wavelength is λt and a 2nd BPF constituted of a dual mode dielectric resonator type BPF and capable of passing a receiving wave whose wavelength is λr, the 1st BPF is connected to an antenna terminal by a 1st connection loop element whose loop length is λr/4 and the 2nd BPF is connected to the antenna element by a 2nd connection loop element whose loop length is λt/4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna duplexer, and more particularly to, for example, transmission / reception sharing for transmitting a transmission wave with one antenna and receiving a reception wave in, for example, mobile communication and broadcast transmission / reception facilities. It relates to technology that is effective when planning.

[0002]

2. Description of the Related Art FIG. 14 is a block diagram showing a schematic configuration of a conventional antenna duplexer. In the figure, 200a,
Reference numeral 200b denotes a band-pass filter (hereinafter, simply referred to as a BPF) for transmitting a transmission wave, 201a and 201b denote BPFs for transmitting a reception wave, and 102 denotes a low noise amplifier (LNA). The transmission wave input to the terminal (Tb) via the cable (not shown) is transmitted to the BPF (201a, 2a).
01b) to the terminal (Ta) and is radiated from an antenna (not shown). The received wave received by the antenna is a BPF (201a), a low noise amplifier 102, a BPF
(201b) to the terminal (Tb), and the terminal (T
b) is transmitted to the station via a cable. In addition,
In FIG. 14, ft represents the transmission frequency of the transmission wave, and fr represents the reception frequency of the reception wave.

[0003]

In the conventional antenna duplexer shown in FIG. 14, a BPF using the same resonator is used as the BPF (201a, 201b) and the BPF (201a, 201b). Therefore, when the antenna duplexer shown in FIG. 14 is configured by a low-loss BPF, the size of the resonator used is large, and the overall size becomes large and the duplexer becomes overdesigned. there were. Conversely, if the resonator forming the BPF is miniaturized in order to miniaturize the antenna duplexer shown in FIG. 14, the loss increases, the transmission output on the transmission side decreases, and the noise figure ( NF) is increased, and the communication quality is degraded. Further, the BPF (20
There is a problem that two BPFs, 1a) and BPF (201b), are required, and the cost increases.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to reduce the size of the conventional device without lowering the electrical characteristics.
Another object of the present invention is to provide an antenna duplexer capable of reducing costs. The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0005]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows. That is, the present invention provides a first band-pass filter, which includes an antenna terminal connected to an antenna and a TM _{01 δ-} mode dielectric resonator band-pass filter, and is connected to the antenna terminal and transmits a transmission wave. And a second band-pass filter connected to the antenna terminal and configured to pass a reception wave, and a dual-mode dielectric resonator band-pass filter, wherein the wavelength of the reception wave Λr, and the wavelength of the transmission wave is λt, the first band-pass filter is connected to the antenna terminal by a first coupling loop element having a loop length of λr / 4, and the second pass band The filter is connected to the antenna terminal by a second coupling loop element having a loop length of λt / 4.

[0006] In a preferred embodiment of the present invention,
A third band-pass filter connected downstream of the second band-pass filter, wherein the third band-pass filter comprises a TM _{01 δ-} mode dielectric resonator type band-pass filter. Features. In a more preferred embodiment of the present invention, the second band-pass filter comprises:
A low-noise amplifier provided between the third band-pass filter and the third band-pass filter.

According to the above means, the first bandpass filter on the transmitting side is formed of a TM _{01 δ} mode dielectric resonator type bandpass filter, and the second bandpass filter on the receiving side is formed of a dual mode dielectric filter. Since it is constituted by a body resonator type band-pass filter, the transmission output on the transmission side does not decrease and the noise figure (NF) on the reception side does not increase, that is, the communication quality decreases. In addition, the size can be reduced and the cost can be reduced as compared with the related art. The wavelength of the received wave is λr, and the wavelength of the transmitted wave is λt
Then, the first band-pass filter is formed by a first coupling loop element having a loop length of λr / 4, and the second pass-band filter is formed by a second coupling loop element having a loop length of λt / 4.
Is connected to the antenna terminal by the coupling loop element, so that the transmitted wave is prevented from leaking to the second band-pass filter on the receiving side, and the received wave is transmitted to the first band-pass filter on the transmitting side. Leakage can be prevented. Further, a third band-pass filter composed of a TM _{01 δ-} mode dielectric resonator type band-pass filter is provided downstream of the second band-pass filter on the receiving side, so that unnecessary radiation on the receiving side is provided. Can be reduced.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. In all the drawings for describing the embodiments, components having the same functions are denoted by the same reference numerals, and repeated description thereof will be omitted. [First Embodiment] FIG. 1 is a block diagram showing a schematic configuration of an antenna duplexer according to a first embodiment of the present invention. In the figure, reference numeral 100 denotes a BPF for transmitting a transmission wave, 101a,
101b is a BPF for passing a reception wave, and 102 is a low noise amplifier (LNA). Also in the present embodiment, the transmission wave input to the terminal (Tb) via the cable (not shown) is transmitted to the antenna terminal (Tb) via the BPF (100).
a) and radiated from an antenna (not shown). The received wave received by the antenna reaches the terminal (Tb) via the BPF (101a), the low-noise amplifier 102, and the BPF (101b), and is propagated from the terminal (Tb) into the office via a cable.

In this embodiment, the transmission side has one BPF
(100), and the BPF (100) is TM
₀₁ Consists of a _δ- mode dielectric resonator bandpass filter. For example, a dual-mode dielectric resonator type band-pass filter having a high unloaded Qu of the resonator has a resonance frequency of ± 1.
At frequencies separated by about 0%, unnecessary resonance occurs due to unnecessary modes. Therefore, in the present embodiment, the transmission side B
As the PF (100), a TM _{01 δ} mode dielectric resonator type band-pass filter that does not cause unnecessary resonance up to the resonance frequency (fo) of 2fo is used. Since the TM _{01 δ} mode dielectric resonator type band pass filter has an insertion loss of about １ ／ or less as compared with the coaxial resonator type band pass filter,
By adopting a TM _{01 δ-} mode dielectric resonator type band-pass filter as the transmission-side BPF (100), a BPF having good attenuation characteristics and small in-band pass loss is adopted.
(100) can be configured.

The BPF (101a) on the receiving side is constituted by a dual-mode dielectric resonator type band-pass filter. This dual-mode dielectric resonator band-pass filter has good attenuation characteristics near the reception frequency (fr) of the reception wave and very low insertion loss at the reception frequency (fr) of the reception wave. Low noise amplifier 1 on top
02 can be reduced in noise figure (NF). However, as described above, the dual mode dielectric resonator type band-pass filter has ± 10% of the resonance frequency.
Unnecessary resonance due to the unnecessary mode occurs at a frequency that is approximately apart. Therefore, in order to solve the problem of the unnecessary resonance, a BPF (101b) composed of a TM _{01 δ} mode dielectric resonator band-pass filter is disposed after the dual mode dielectric resonator band-pass filter. I do.

As a result, the BPF (101a, 101a,
Since 101b) has a low loss, by combining with the low noise amplifier 102, it is possible to realize a low-noise transmission / reception shared tower-top antenna duplexer. As described above, in the present embodiment, the overall electrical characteristics are excellent, the cost is low, and the band-pass filters using the same resonator are used for all the BPFs to obtain the same electrical characteristics. It is possible to provide an antenna duplexer that can be made smaller than the duplexer thus configured.

FIG. 2 shows the BPF (100, 10) shown in FIG.
FIG. 1 is a diagram for explaining the structure of 1a, 101b). In FIG. 2, reference numeral 110 denotes a transmitting-side BPF 10 composed of a TM _{01 δ} mode dielectric resonator type band-pass filter.
0, and 111 denotes a BPF (1) on the receiving side composed of a dual mode dielectric resonator type band-pass filter.
112a), and 112 denotes a B-side filter on the receiving side composed of a TM _{01 δ-} mode dielectric resonator type band-pass filter.
PF (101b) is shown. In FIG. 2, between the terminal (Tc) and the terminal (Td), a low noise amplifier 10 is connected.
2 are provided.

The TM _{01 δ} mode dielectric resonator type band pass filter 110 is connected to the antenna terminal (Ta) by a coupling loop element (La), and the dual mode dielectric resonator type band pass filter 111 is connected to the coupling loop element (La). Element (L
b) is connected to the antenna terminal (Ta).
Here, the length of the coupling loop element (La) is λr / 4
(Λr is the wavelength of the received wave), the coupling loop element (Lb)
Is selected as λt / 4 (λt is the wavelength of the transmission wave). This prevents the reception wave input from the antenna terminal (Ta) from leaking to the TM _{01 δ} mode dielectric resonator type band-pass filter 110, and suppresses the transmission wave input from the antenna terminal (Ta). To prevent leakage to the dual mode dielectric resonator bandpass filter 111. Further, the TM _{01 δ} mode dielectric resonator type band pass filter 110 is connected to the terminal (Tb) by the coupling loop element (Lc). Further, the TM _{01 δ-} mode dielectric resonator band-pass filter 112 is connected to the terminal (Tb) by the coupling loop element (Ld), and is connected to the terminal (Td) by the coupling loop element (Le). .

Hereinafter, the TM _{01 δ} mode dielectric resonator type band pass filter 110, the dual mode dielectric resonator type band pass filter 111, and the TM _{01 δ} mode dielectric resonator type band pass filter 112 will be described. FIG. 3 is a diagram for explaining an example of the dual-mode dielectric resonator type band-pass filter 111 shown in FIG. 2, and is a main-portion cross-sectional view showing a cross-sectional structure along the axial direction. Also,
FIG. 4A is a cross-sectional view of a main part showing a cross-sectional structure taken along the line AA ′ shown in FIG. 3A, and FIG.
FIG. 4C is a cross-sectional view taken along the line BB ′ shown in FIG. 3A. FIG. 4C is a cross-sectional view taken along the line CC ′ shown in FIG. It is principal part sectional drawing.

[0015] In FIGS. 3 and 4, 1 is an outer conductor formed of TE ₁₀₁ cutoff waveguide, 2a, 2b are internal diaphragm (coupling iris), 3 denotes an input (or output) terminal, 4 is output (or input ) Terminals 5a, 5b, 5c are V mode frequency adjusting screws, 6a, 6b, 6c are H mode frequency adjusting screws, 7a, 7b, 7c are coupling adjusting screws, 8 is an input (or output) coupling loop element, 10a, 10b, 10
c is a dual mode dielectric resonator, 12a is an internal partition 2
a is a capacitive coupling window formed in a, and 12b and 12c are capacitive coupling windows formed in the internal partition 2b. Here, FIG.
As shown in the figure, the V mode frequency adjustment screws (5a, 5b,
5c), and H mode frequency adjusting screws (6a, 6b,
6c) is provided so that each axial direction has an angle difference of 90 °, and the coupling adjustment screws (7a, 7b, 7) are provided.
c) is a V mode frequency adjusting screw (5a, 5b, 5c)
Are provided so as to have an angle difference of ± 45 ° with respect to the axial direction.

FIG. 5 is a view for explaining an example of the TM _{01 δ-} mode dielectric resonator type band-pass filter 110 shown in FIG. 2, and is taken along a direction orthogonal to the axial length direction of the dielectric resonance element. It is principal part sectional drawing which shows a sectional structure. FIG. 6 is a cross-sectional view of a principal part showing a cross-sectional structure along the line AA 'shown in FIG. 5 and 6, 11 is an outer conductor, 2 is a partition, 3 is an input (or output) terminal, 4 is an output (or input) terminal, 8 is an input (or output) coupling loop element, 9
Are output (or input) coupling loop elements, 40a to 40d
Denotes a TM _{01 δ} mode dielectric resonator, 41a to 41d denote dielectric resonance elements, and 51a to 51c denote interstage magnetic field coupling adjustment elements. TM _{01 δ} mode dielectric resonator (40a-40d)
Are made of a dielectric material having a relatively high dielectric constant, such as ceramic, for example. The dielectric resonance elements (41a to 41d) use an appropriate adhesive. According to the above method, the outer conductor 11 is provided between the upper wall and the lower wall. In the group delay time compensation type BPF of the present embodiment, a resonance frequency fine adjustment unit for finely adjusting the resonance frequency may be provided.

The TM _{01 δ} mode dielectric resonator type band-pass filter 110 shown in FIG. 6 is a dielectric resonator (40a-1).
4d) are arranged in a U-shape, and each of the dielectric resonators (40a to 40a)
40d) is mainly coupled by a magnetic coupling circuit. Further, between adjacent dielectric resonators (40a to 40d), interstage magnetic field coupling adjustment elements (51a to 51c) are arranged. FIG.
Are the interstage magnetic field coupling adjustment elements (51a to 51a) shown in FIGS.
It is a figure for explaining 51c). As shown in FIG. 7, the inter-stage magnetic field coupling adjustment elements (51a to 51c) are each formed of a single conductor plate 55 having a predetermined hole (57 in FIG. 7) in the upper central portion. The upper side and the lower side of this one conductor plate 55 are electrically and mechanically connected to the upper and lower walls of the external conductor 11, and the side of one conductor plate 55 is
It is electrically and mechanically connected to the partition wall 2 or the side wall of the external conductor 11. Further, the interstage magnetic field coupling adjustment element (51
a to 51c), a predetermined hole (FIG. 7)
At 57), a coupling adjusting screw 56 is inserted.

FIG. 8 is a diagram for explaining an example of the TM _{01 δ-} mode dielectric resonator type band-pass filter 112 shown in FIG. 2, and is taken along a direction orthogonal to the axial length direction of the dielectric resonance element. It is principal part sectional drawing which shows a sectional structure. FIG. 9 is a cross-sectional view of a principal part showing a cross-sectional structure along the line AA 'shown in FIG. 8 and 9, reference numeral 16 denotes an S-shaped coupling loop element, and the other reference numerals are the same as those in FIGS. 8 and 9 show the first dielectric resonator element (41
a) and the fourth dielectric resonance element (41d)
Except that they are sub-coupled by a loop element 16
Since it is the same as the TM _{01 δ-} mode dielectric resonator type band-pass filter 112 shown in FIGS. 5 and 6, detailed description is omitted. In FIG. 8, the first dielectric resonance element (41a)
And the fourth dielectric resonator element (41d) are provided in the axial direction of the dielectric resonator element, and the axis length of the dielectric resonator element of the partition wall 2 is divided by a portion penetrating the partition wall 2. At different positions in the vertical direction, both ends are electrically connected to the partition,
Since the sub-couplings are mechanically connected by the S-shaped loop element 16, the sub-coupling therebetween is capacitive coupling.

FIG. 10 shows the BPF (100, 1) shown in FIG.
01a, 101b) are converted to TM _{01 δ-} mode dielectric resonator band-pass filter 110, dual-mode dielectric resonator band-pass filter 111, and TM _{01 shown in FIG.}
FIG. 9 is a circuit diagram showing an equivalent circuit when the filter is constituted by a _δ- mode dielectric resonator type band-pass filter. In FIG. 10, the circuit of the CSA portion is an equivalent circuit of the TM _{01 δ} mode dielectric resonator type band pass filter 110 shown in FIG.
The circuit in the CSB portion is an equivalent circuit of the dual mode dielectric resonator bandpass filter 111 shown in FIG. 2, and the circuit in the CSC portion is the equivalent circuit of the TM _{01 δ} mode dielectric resonator bandpass filter shown in FIG. It is.

In the above description, the fourth dielectric resonator element (41d) of the TM _{01 δ} mode dielectric resonator bandpass filter (110, 112) is connected to the terminal (Tb) by the coupling loop element 8. However, the present invention is not limited to this. As shown in FIG. 11, the fourth dielectric resonance element (41d) of the TM _{01 δ} mode dielectric resonator type band-pass filter (2, 3) and the terminal (Tb) may be connected by the coupling probe 20. Note that FIG.
Is a cross-sectional view of a main part of the same part as FIG. 6 (AA ′ shown in FIG. 5).
It is a principal part sectional view along the line). With such a structure, lightning resistance can be improved.

FIG. 12 shows the BPF (100, 1) shown in FIG.
01a, 101b) are converted to TM _{01 δ} mode dielectric resonator type band-pass filter 110 and TM ₀₁ shown in FIG.
FIG. 3 is a circuit diagram showing an equivalent circuit when the _δ- mode dielectric resonator band-pass filter 112 and the dual-mode dielectric resonator band-pass filter 111 shown in FIG. 2 are used. The equivalent circuit shown in FIG. 12 is different from the equivalent circuit shown in FIG. 10 in that the terminal (Tb) and the last-stage resonance circuit are connected by a capacitor (capacitor). Accordingly, the DC power supply of the low noise amplifier 102 can be superimposed on the coaxial cable connected to the terminal (Tb). As shown in the equivalent circuit of FIG. LL) through the low noise amplifier 10
2 can be supplied.

[Embodiment 2] FIG. 13 is a block diagram showing a schematic configuration of an antenna duplexer according to Embodiment 2 of the present invention. In the present embodiment, the circulator 103 between the BPF (101b) and the low noise amplifier (LNA) 102
Is different from the antenna duplexer of the first embodiment. In the present embodiment, the transmission wave leaked to the TM _{01 δ} mode dielectric resonator type band-pass filter 112 is absorbed by the terminating resistor (R) by the circulator 103, so that the TM _{01 δ} mode dielectric resonator type band pass filter Pass filter 1
The transmission wave leaked to the low noise amplifier (LNA) 10
2 can be prevented. Therefore,
In the present embodiment, it is possible to prevent the transmission noise leaking to the TM _{01 δ-} mode dielectric resonator band-pass filter 112 from affecting the low noise amplifier (LNA) 102. As described above, the invention made by the inventor has been specifically described based on the embodiment.
It is needless to say that the present invention is not limited to the above-described embodiment, but can be variously changed without departing from the gist thereof.

[0023]

The effects obtained by typical ones of the inventions disclosed in the present application will be briefly described as follows. ADVANTAGE OF THE INVENTION According to the antenna duplexer of this invention, it becomes possible to aim at miniaturization and cost reduction conventionally, without lowering an electrical characteristic.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of an antenna duplexer according to Embodiment 1 of the present invention.

FIG. 2 shows a BPF (100, 101a, 101) shown in FIG.
It is a figure for explaining the structure of b).

FIG. 3 is a diagram for explaining an example of a dual-mode dielectric resonator band-pass filter 111 shown in FIG. 2;
It is a principal part sectional view which shows the cross-section along an axial direction.

FIG. 4 is a cross-sectional view of a main part showing a cross-sectional structure along each cutting line shown in FIG. 3;

5 is a diagram for explaining an example of a TM _{01 δ} mode dielectric resonator type band pass filter 110 shown in FIG. 2,
FIG. 4 is a cross-sectional view of a principal part showing a cross-sectional structure along a direction orthogonal to the axial length direction of the dielectric resonance element.

6 is a cross-sectional view of a principal part showing a cross-sectional structure along the line AA ′ shown in FIG. 5;

FIG. 7 is a diagram for explaining the interstage magnetic field coupling adjustment element shown in FIGS. 5 and 6;

8 is a diagram for explaining an example of a TM _{01 δ} mode dielectric resonator type band pass filter 112 shown in FIG. 2,
FIG. 4 is a cross-sectional view of a principal part showing a cross-sectional structure along a direction orthogonal to the axial length direction of the dielectric resonance element.

9 is a cross-sectional view of a principal part showing a cross-sectional structure along the line AA 'shown in FIG.

FIG. 10 shows a BPF (100, 101a, 10) shown in FIG.
1b) is composed of the TM _{01 δ} mode dielectric resonator type band pass filter 110, the dual mode dielectric resonator type band pass filter 111, and the TM _{01 δ} mode dielectric resonator type band pass filter shown in FIG. FIG. 9 is a circuit diagram showing an equivalent circuit in the case where the above operation is performed.

FIG. 11 is a cross-sectional view of a principal part showing a coupling probe part of a TM _{01 δ} mode dielectric resonator type band-pass filter in which a fourth dielectric resonance element (41d) and a terminal (Tb) are connected by a coupling probe. It is.

FIG. 12 shows a BPF (100, 101a, 10B) shown in FIG.
1b) is replaced with a TM _{01 δ} mode dielectric resonator type band pass filter 110 and a TM _{01 δ} mode dielectric resonator type band pass filter 112 shown in FIG. 11 and a dual mode dielectric resonator shown in FIG. Type band pass filter 11
FIG. 2 is a circuit diagram showing an equivalent circuit in the case of the configuration of FIG.

FIG. 13 is a block diagram showing a schematic configuration of an antenna duplexer according to Embodiment 2 of the present invention.

FIG. 14 is a block diagram showing a schematic configuration of a conventional antenna duplexer.

[Explanation of symbols]

1, 11 ... outer conductor, 2, 2a, 2b ... inner partition, 3 ...
Input (or output) terminal, 4... Output (or input) terminal, 5a, 5b, 5c... V mode frequency adjusting screw, 6
a, 6b, 6c: H mode frequency adjusting screw, 7a, 7
b, 7c: coupling adjustment screw, 8: input (or output) coupling loop element, 9: output (or input) coupling loop element,
10a, 10b, 10c: dual mode dielectric resonator; 12a, 12b, 12c: capacitive coupling window; 16: S
Shaped coupling loop element, 40 a to 40 d ... TM _{01 [delta]} mode dielectric resonators, 41 a to 41 d ... dielectric resonator element, 5
1a to 51c: interstage magnetic field coupling adjustment element, 55: conductor plate,
56: Coupling adjusting screw, 100, 101a, 101b, 2
00a, 200b, 201a, 201b: band pass filter (BPF), 102: low noise amplifier (LNA), 1
03: circulator, 110, 112 ... TM _{01 δ-} mode dielectric resonator band-pass filter, 111: dual-mode dielectric resonator band-pass filter, Ta, Tb,
Tc, Td terminal, La, Lb, Lc, Ld, Le: coupling loop element, LL: coil, R: terminal resistor.

Claims (3)

[Claims] An antenna terminal connected to an antenna, and a first band-pass filter configured by a TM _{01 δ-} mode dielectric resonator type band-pass filter, connected to the antenna terminal, and transmitting a transmission wave. An antenna duplexer comprising a dual-mode dielectric resonator type band-pass filter and a second band-pass filter connected to the antenna terminal and passing a reception wave, wherein the wavelength of the reception wave is When the wavelength of the transmission wave is λt, the first band-pass filter has a loop length of λt.
The antenna terminal is connected to the antenna terminal by an r / 4 first coupling loop element, and the second passband filter is connected to the antenna terminal by a second coupling loop element having a loop length of λt / 4. Antenna duplexer characterized by the following. And a third band-pass filter connected downstream of the second band-pass filter, wherein the third band-pass filter is a TM _{01 δ-} mode dielectric resonator type band-pass filter. The antenna duplexer according to claim 1, wherein the antenna duplexer is configured. 3. The antenna duplexer according to claim 2, further comprising a low noise amplifier provided between said second band-pass filter and said third band-pass filter.