JP2000013111A - Antenna multicoupler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the antenna multicoupler that has terminal arrangement by which a transmission circuit and a reception circuit are mounted apart from each other. SOLUTION: A transmission filter and a reception filter consists respectively of pluralities of coaxial dielectric resonators 1 and electric components to connect the coaxial dielectric resonators 1. The transmission filter and the reception filter are placed on one and the same printed circuit board 18 side by side in opposite directions to each other or transmitter side terminals of the transmission filter and receiver side terminals of the reception filter are placed in the vicinity of opposite side ends on the printed circuit board respectively in this antenna multicoupler 16.

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 an antenna duplexer used for mobile communication equipment having a center frequency of several hundred MHz to several GHz.

[0002]

2. Description of the Related Art FIG. 3 is a diagram showing the structure of a conventional antenna duplexer. In FIG. 3, a transmitting filter and a receiving filter are connected in parallel. The transmission-side filter and the reception-side filter are configured such that the respective coaxial dielectric resonators 1 are grounded on the grounding conductor 2 formed on the same printed circuit board 18 surface. The coupling capacitor 3 and the coupling inductor 4 are electrically connected on a conductor pattern 5 formed on the open end side of the coaxial dielectric resonator 1. Each coaxial dielectric resonator 1 is connected to each conductor pattern 5 by a terminal pin 6. Further, an antenna terminal 8, a transmission terminal 7, a reception terminal 9, and ground terminals 10 and 15 are formed on the conductor pattern 5 around the side end of the printed circuit board 18.

The metal case 11 is fixed so as to cover the whole of the antenna duplexer 14. Metal case 11
Are connected to the ground terminals 10 and 15, and the metal case 11 is electrically connected to the entire upper surface of the coaxial dielectric resonator 1. An opening 13 for adjustment is provided in a portion of the metal case 11 corresponding to the vicinity of the open end of the coaxial dielectric resonator 1 and the vicinity of the coupling inductor 4.
Is provided.

FIG. 4 is a top view of the duplexer 14 shown in FIG. In FIG. 4, the transmission filter and the reception filter are disposed substantially separately on the left and right with the antenna terminal 8 as a center.

[0005]

In the antenna duplexer 14, the transmission frequency band and the reception frequency band are controlled so that the transmission signal does not enter the reception system circuit or the reception signal does not enter the transmission system circuit. It is desirable that the isolation be high. However, at higher frequencies,
Since signals are coupled through a substrate or space, it is difficult to obtain high isolation. The coupling between the receiving circuit and the transmitting circuit is almost inversely proportional to the distance between them, so to reduce the coupling and obtain high isolation, the distance between the transmitting circuit component and the receiving circuit component must be It is desirable to arrange them apart so as not to interfere with each other.

The duplexer 14 has a function of distributing a transmission signal and a reception signal to a transmission circuit and a reception circuit, respectively. A transmission system circuit and a reception system circuit are connected to the transmission terminal 7 and the reception terminal 9, respectively. The positions of the transmitting system circuit and the receiving system circuit in the antenna duplexer 14 are as follows: the transmitting terminal 7, the antenna terminal 8, the receiving terminal 9, and the grounding terminals 10 and 15 of the antenna duplexer 14
Depending on the position on the printed circuit board 18,
Almost decided. Therefore, in order to arrange the transmission system circuit and the reception system circuit apart from each other, the antenna duplexer 14
Need to be arranged apart from each other.

However, in the structure of the conventional dielectric filter, as shown in FIG. 3, the open ends of the plurality of coaxial dielectric resonators 1 are arranged on the same printed circuit board 18 in the same direction. Each terminal is formed on the open end side. For this reason, there is a problem that the terminals cannot be arranged sufficiently separated from each other, and it is difficult to mount the transmission circuit and the reception circuit sufficiently separated from each other.

SUMMARY OF THE INVENTION It is an object of the present invention to improve such a problem and to realize an antenna duplexer having a terminal arrangement such that a transmitting circuit and a receiving circuit can be mounted separately.

[0009]

According to the present invention, there is provided an antenna duplexer in which a transmission filter and a reception filter are connected in parallel, wherein the transmission filter and the reception filter each include a plurality of coaxial dielectric resonators and a coaxial dielectric resonator. An open end and an electric element of a coaxial dielectric resonator that constitutes a transmission filter and an open end of a coaxial dielectric resonator of a reception filter that constitutes a reception filter. The electric elements are arranged on the same printed circuit board in parallel with each other and in opposite directions, or
Further, the transmission-side terminal of the transmission filter and the reception-side terminal of the reception filter are antenna duplexers provided near the opposing side ends of the printed circuit board.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an antenna duplexer 16 according to the present invention.
FIG. 3 is a diagram showing the structure of FIG. In FIG. 1, the antenna duplexer 16 is configured by connecting a transmission filter and a reception filter in parallel. Both the transmission filter and the reception filter are constituted by a coaxial resonator 1 and a coupling capacitor 3 and a coupling inductor 4 for coupling the coaxial resonator 1, as in the prior art.

In the antenna duplexer 16 according to the present invention, the open ends of the coaxial resonators 1 of the transmission filter and the reception filter are arranged on the same printed circuit board 18 so as to be parallel to and opposite to each other. Are located.
The conductor pattern 5 is arranged on the open end side of each of the coaxial dielectric resonators 1. Each conductor pattern 5
In addition to the coaxial dielectric resonator 1, an electric element for coupling the coaxial dielectric resonators 1, that is, a coupling capacitor 3 and a coupling inductor 4 are connected to the.

On the printed circuit board 18, the coupling capacitor 3 and the coaxial dielectric resonator 1 are connected so that the transmission filter, the reception filter, and the antenna terminal are electrically connected in the shortest distance by the conductor pattern. Components such as the coupling inductor 4 are arranged.

FIG. 2 shows an antenna duplexer 16 according to the present invention.
FIG. As shown in FIG. 2, the transmitting side terminal 7 and the receiving side terminal 9 of the antenna duplexer 16 are arranged near the opposing side edges of the printed circuit board 18.
For this reason, the transmission system circuit and the reception system circuit connected from the transmission side terminal 7 and the reception side terminal 9 of the antenna duplexer 16 can be arranged at positions sufficiently separated from each other, and the mutual isolation is increased. It becomes easier. Also, in the metal case 17 covering the entire antenna duplexer 16, the grounding claws 12 and the openings 13 are formed in directions opposite to each other on the transmission filter side and the reception filter side according to the arrangement of the coaxial resonator 1. ing.

[0015]

As described above, according to the present invention, the transmitting circuit and the receiving circuit are arranged apart from each other, and the transmitting terminal of the transmitting filter and the receiving terminal of the receiving filter are arranged in the same manner.
By providing them near the opposing side edges on the printed circuit board, an antenna duplexer with high isolation between the transmission circuit and the reception circuit can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a structure of an antenna duplexer according to the present invention.

FIG. 2 is a top view of the duplexer of FIG. 1;

FIG. 3 is a diagram showing a structure of a conventional antenna duplexer.

FIG. 4 is a top view of the antenna sharing device of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coaxial dielectric resonator 2 Grounding conductor 3 Coupling capacitor 4 Coupling inductor 5 Conductor pattern 6 Terminal pin 7 Transmitting terminal 8 Antenna terminal 9 Receiving terminal 10 Grounding terminal 11 Metal case 12 Grounding nail 13 Adjustment Opening 14 Antenna duplexer 15 Grounding terminal 16 Antenna duplexer 17 Metal case 18 Printed circuit board 19 Coupling element for transmission filter 20 Coupling element for reception filter

Claims (2)

[Claims] 1. An antenna duplexer in which a transmission filter and a reception filter are connected in parallel, wherein the transmission filter and the reception filter respectively couple a plurality of coaxial dielectric resonators and the coaxial dielectric resonators. The open end of the coaxial dielectric resonator constituting the transmission filter and the electric element, and the open end of the coaxial dielectric resonator constituting the reception filter and the electric element. An antenna duplexer, wherein the elements are arranged on the same printed circuit board in parallel and in opposite directions. 2. The printed circuit board according to claim 1, wherein a transmission-side terminal of the transmission filter and a reception-side terminal of the reception filter are provided near opposing side ends of the printed circuit board. Antenna duplexer.