JP2581912Y2 - Duplexer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duplexer used as, for example, a duplexer in which a transmission filter and a reception filter are integrated.

[0002]

2. Description of the Related Art Conventionally, for example, a duplexer is used as a duplexer in a cellular base station in a mobile communication system. FIG. 6 shows the structure of the duplexer.

FIG. 6 shows a state in which a case cover is removed. FIG. 6A is a top view, FIG. 6B is a front view, and FIG. 6C is a right side view. In FIG. 6, reference numeral 1 denotes a lower case, in which six dielectric resonator units 2, 3, 4, 5,
6 and 7 are arranged. Connectors 8 and 10 and junction boxes 12 and
14 and 16 are provided. A coupling loop 9 for magnetically coupling the resonator of the dielectric resonator unit 2 is provided between the center conductor of the connector 8 and the ground (case), and the resonance of the dielectric resonator unit 5 is provided between the center conductor of the connector 10 and the ground. A coupling loop 11 for magnetically coupling with the device is provided. A coupling loop 13 for magnetically coupling the resonator of the dielectric resonator unit 4 is provided between the center conductor of the junction box 12 and the ground, and the coupling loop 13 of the dielectric resonator unit 7 is provided between the center conductor of the junction box 14 and the ground. A coupling loop 15 for magnetically coupling the resonator is provided. Junction boxes 12 and 16 and 14 and 16 are joined by semi-rigid joining cables 18 and 19, respectively. The junction box 16 has a connector 1
7 are provided. In such a configuration, a plurality of stages of reception filters that allow the dielectric resonator units 2, 3, and 4 to pass through the reception frequency band, and the dielectric resonator units 5, 6, and 7
Is a multi-stage transmission filter that passes the transmission frequency band, the connector 8 is an output terminal to the reception unit, and the connector 1 is
0 can be used as an input terminal from the transmission unit, and the connector 17 can be used as an antenna input / output terminal, as an antenna input / output terminal.

[0004]

As described above, in the conventional duplexer in which the coupling is performed by the junction box via the two joint cables, the transmission filter side is opened in the reception frequency band,
The length of the two joined cables must be adjusted so that the reception filter side is open in the transmission frequency band, and the phases must be adjusted at the respective frequencies. However, in such a cable combining method, unless the phase is adjusted very finely, the filters interfere with each other, making it difficult to adjust the filter. In addition, power loss occurs at the junction and the junction cable. Further, there is a problem that the junction box and the joining cable are provided outside the case, which complicates the entire structure.

An object of the present invention is to provide a duplexer in which the above-mentioned various problems are solved by performing the synthesis without using the conventional junction box and junction cable.

[0006]

According to the present invention, a first dielectric resonator for passing a first frequency band and a second dielectric resonator for passing a second frequency band are provided in a conductor case. In a duplexer, wherein a signal input / output connector is provided on the conductor case, a first coupling loop for projecting a center conductor of the signal input / output connector into the conductor case and magnetically coupling to a first dielectric resonator And a first small phase adjusting loop for adjusting the phase between the first dielectric resonator and the signal input / output connector is provided between the center conductor and the ground, respectively, and magnetically coupled to the second dielectric resonator. A second coupling loop and a second small phase adjustment loop for adjusting the phase between the second dielectric resonator and the signal input / output connector are provided between the center conductor and the ground, respectively. I do.

[0007]

In the duplexer of the present invention, the center conductor of the signal input / output connector projects into the conductor case, and a first coupling loop and a first phase adjustment small loop are provided between the center conductor and the ground. A second coupling loop and a second phase adjustment small loop are provided between the center conductor and the ground. The first coupling loop comprises a first
And the second coupling loop magnetically couples with the second dielectric resonator. Therefore, the first coupling loop and the second coupling loop combine signals at the central conductor of the signal input / output connector. that time,
The first small loop for phase adjustment adjusts the phase between the first dielectric resonator and the signal input / output connector, and the second small loop for phase adjustment adjusts the phase between the second dielectric resonator and the signal input / output connector. Adjust the phase of. Therefore, the first dielectric resonator side is opened (open) in the first frequency band and the second dielectric band is opened in the second frequency band depending on the length and shape of the first and second phase adjustment small loops. The phase can be adjusted in each frequency band so that the dielectric resonator side is open, thereby synthesizing signals.

[0008]

1 to 5 show the configuration of a duplexer according to an embodiment of the present invention.

FIG. 1 is a view showing the structure of a duplexer with an upper cover removed, wherein (A) is a top view, (B) is a front view, and (C) is a right side view. In FIG. 1, reference numeral 1 denotes a lower case in which six dielectric resonator units 2, 3, 4, 5, 6, and 7 are arranged and housed. Here, one of the three dielectric resonator units 2, 3, and 4 is a TM ₁₁₀ dual mode dielectric resonator, and the other two are TM.
₁₁₀ made of a single mode dielectric resonator, constituting the band pass filter 4 stages as a reception filter by the three dielectric resonator units 2,3,4. Further, each dielectric resonator units 5, 6, 7 consists TM ₁₁₀ dual mode dielectric resonator, a band pass filter of six stages as a transmitting filter by the three dielectric resonator units 5, 6, 7 Configure. Connectors 8, 10, 17 are provided on the side surface of the lower case 1. A coupling loop 9 for magnetically coupling with the resonator of the dielectric resonator unit 2 is provided between the center conductor of the connector 8 and the ground (case),
Between the center conductor of the connector 10 and the ground, there is provided a coupling loop 11 for magnetically coupling the resonator of the dielectric resonator unit 5 with the magnetic field.

FIG. 2 is a partial plan view showing the structure near the connector 17 shown in FIG. In FIG. 2, reference numeral 20 denotes a center conductor of the connector 17, and reference numeral 21 denotes a pin attached to the center conductor 20. The pins 21 are fitted with cylindrical bushes 22 and 23 made of fluororesin. A coupling loop 24 and a small phase adjustment loop 25 are provided between one end of the pin 21 and the ground (case 1). A coupling loop 26 and a small phase adjustment loop 27 are provided between the other end of the pin 21 and the ground. The coupling loop 24 is magnetically coupled to the resonator of the dielectric resonator unit 4, and the small phase adjusting loop 25 is connected to the resonator of the dielectric resonator unit 4 and the connector 17.
Of the center conductor 20 is adjusted.

The phase adjusting small loop 25 has a dielectric resonance due to its inductive component equivalently entering the coupling loop 24 and being coupled to the coupling loop 24 and the resonator of the dielectric resonator unit 4. It is considered that the phase between the resonator of the device unit 4 and the center conductor 20 of the signal input / output connector changes. On the other hand, the coupling loop 26 is magnetically coupled with the resonator of the dielectric resonator unit 7,
The phase adjustment small loop 27 adjusts the phase between the resonator of the dielectric resonator unit 7 and the center conductor 20 of the connector 17. The small phase adjusting loop 27 is formed by the inductive component equivalently entering the coupling loop 26 in parallel with the coupling loop 26 and the dielectric resonator unit 7.
Is considered to change the phase between the resonator of the dielectric resonator unit 7 and the center conductor 20 of the signal input / output connector. The adjustment of these phase adjustment small loops 25 and 27 is performed by deforming the shape using a jig with the upper cover removed.

FIG. 3 is a partially exploded perspective view showing the structure near the bushes 22 and 23 shown in FIG. In FIG. 3, 2
Reference numeral 8 denotes a metal cover that holds the bushes 22 and 23 and that is fixed to the inner wall surface of the lower case. This cover 2
By attaching 8 to the inner wall surface of the lower case, the mechanical stability of the pin 21 and each loop shown in FIG. 5 is increased, and the pin 21 is shielded.

FIGS. 4 and 5 are perspective views showing the structure of each dielectric resonator unit shown in FIG. In FIG. 4, reference numeral 30 denotes a dielectric ceramic cavity, and 31 denotes an internal dielectric provided therein by integral molding. As in this example, two openings are provided in the dielectric ceramic cavity, the openings are opposed to each other, and a plurality of dielectric resonator units are arranged, so that coupling between adjacent dielectric resonator units can be achieved. Take.

In the case of a dual mode dielectric resonator unit, a cut (not shown) is provided in the cross-shaped internal dielectric to obtain coupling between the resonators in the unit. In addition,
When arranging the dielectric resonator unit and taking the coupling between the dielectric resonator units, in order not to couple with unnecessary magnetic field components,
For example, as shown in FIG. 5, a partition plate 32 having a slit portion is provided at the opening of the dielectric ceramic cavity.

[0015]

According to the present invention, the following effects can be obtained.

(1) Since a junction box and a junction cable for joining the junction boxes are not required, power loss due to the junction box and the junction cable is eliminated, and Q of the dielectric resonator for obtaining desired characteristics is conventionally reduced. Can be set lower,
Therefore, a small duplexer can be configured as a whole by using a small dielectric resonator.

(2) A junction box and a junction cable are not required, and the entire structure is simplified.
Cost reduction can be achieved along with miniaturization.

(3) Since the phase is adjusted by the small loop for phase adjustment, even if the adjustment is rough to some extent, there is almost no interference between the two filters, and each filter can be adjusted independently. Become.

[Brief description of the drawings]

FIG. 1 is a view showing a state in which an upper cover of a duplexer according to an embodiment of the present invention is removed, FIG.
(B) is a front view, and (C) is a right side view.

FIG. 2 is a partial plan view showing a structure near a connector 17 shown in FIG.

FIG. 3 is a partially exploded perspective view showing a mounting structure of a bush portion shown in FIG. 2;

FIG. 4 is a diagram showing a structure of a dielectric resonator unit.

FIG. 5 is a diagram showing a structure of a dielectric resonator unit.

6A and 6B are diagrams showing a state in which an upper cover of a conventional duplexer is removed, wherein FIG. 6A is a top view, FIG. 6B is a front view, and FIG. 6C is a right side view.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01P 1/213 H01P 1/20-1/205

Claims (1)

(57) [Scope of request for utility model registration] 1. A first dielectric resonator that passes a first frequency band and a second dielectric resonator that passes a second frequency band are arranged in a conductor case, and a signal is supplied to the conductor case. In a duplexer provided with an input / output connector, a first coupling loop and a first dielectric resonator for projecting a center conductor of a signal input / output connector into the conductor case and magnetically coupling to a first dielectric resonator And a first phase adjustment small loop for adjusting the phase between the signal input / output connector and
A second coupling loop which is provided between the center conductor and the ground and magnetically couples to a second dielectric resonator, and a second phase which adjusts a phase between the second dielectric resonator and the signal input / output connector A duplexer, wherein a small adjustment loop is provided between the center conductor and the ground.