JPS62235801A - Incorporated type dielectric multicoupler - Google Patents

Abstract

PURPOSE:To facilitate remarkably assembling by adopting the constitution that two kinds of filter sections whose center frequencies differ from each other are incorporated continuously and an input/output shared pin is inserted to a position between both the filters where phases are matched properly so as to reduce number of components and simplify the structure. CONSTITUTION:Two kinds of filter sections 32, 34 whose center frequencies differ from each other are incorporatedly and continuously in the lengthwise direction. In combining the phases of both the filters 50, 52, a distance X1 between the input/output pin 54 and a reception hole 56 is obtained so as to make the impedance at the center frequency at the reception side infinite as to the transmission side filter 50 and the distance Y1 is obtained similarly as to the reception side filter 12 separately from sizes of resonance holes and coupling holes. Both the filters are incorporated based on the distances X1, Y2 obtained in this way. Distances X2, Y2 for the incorporation arc obtained by multiplying a factor (k) with the distances X1, Y1. The factor (k) is obtained in advance by experiments from the relation of the both.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a duplexer having a multistage dielectric resonator structure used in a mobile radio device, etc., which uses a simultaneous transmitting and receiving method with different transmitting and receiving frequencies. relates to a dielectric duplexer having a structure in which two types of filter sections having different center frequencies are continuously integrated in the longitudinal direction.

[Prior Art] In a mobile source WA device such as a car phone that uses simultaneous transmission and reception, an antenna duplexer using a dielectric resonator is used to enable the antenna to be shared for transmission and reception using different frequencies. It is used.

Additionally, an interstage duplexer may be used within the circuit.

As a conventional antenna duplexer, for example, as shown in FIG. 4, a multistage (three stages in the figure) dielectric resonator structure is combined with an independent transmitting side filter 10 and a receiving side filter 12, and a metal housing is used. There is a configuration in which the filter is housed and fixed inside (not shown) and 0-phase synthesis of both filters is performed.

The transmitting side filter 10 and the receiving side filter 12 are each designed to have a predetermined resonance frequency, and each has a coupling capacitor 14a at the open end of the resonator hole located at both ends.
, . . . , 14d are mounted and connected to external circuits through them. Coupling capacitors 14a and 14d on one side of both filters 10.12 are connected to the transmitting connector 16 and the receiving connector 18 by lead wires 20, respectively, and the remaining coupling capacitors 14b and 14c are connected to each other by a coupling lead wire 22. Along with power supply lead wire 2
4 to the common connector 26.

Here, the configuration of the common side coupling section is simply the coupling capacitor 14b.
, 14c and the common connector 26 using the lead wires 22, 24. In order to make it possible to share the antenna, the phase relationship is important and it is necessary to perform appropriate phase synthesis. In other words, when looking at the transmitting side filter 10 at the center frequency of the receiving side from the coupling point and when looking at the receiving side filter 12 at the center frequency of the transmitting side, the coupling is made so that the impedance is almost infinite (open state). Capacitor 14b.

14c capacity, coupling lead wire 22 and power supply lead wire 2
Relationships such as the length of 4 must be adjusted.

[Problems to be Solved by the Invention] In order to exhibit the characteristics of a duplexer as described above, it is necessary to perform appropriate phase synthesis, and for this purpose, the length of the coupling lead wire and the power supply lead wire, Furthermore, the relationship between the capacitance and other factors of the coupling capacitors to which they are connected must always be kept constant, which has disadvantages such as increasing the number of parts, making assembly complicated, and requiring many adjustment steps and making the work difficult. Ta.

In addition, it is necessary to manufacture two dielectric filters independently and incorporate them into a metal casing, and it is also necessary to fix the common parts in a certain shape, resulting in disadvantages such as the casing structure becoming complicated and large. There was also.

The purpose of the present invention is to eliminate the drawbacks of the prior art as described above,
It is an object of the present invention to provide a dielectric duplexer with an integrated structure that can greatly reduce the number of parts and simplify assembly and adjustment work.

[Means for Solving the Problems] The present invention, which can achieve the above objects, has two filter sections with different center frequencies each forming a multi-stage dielectric resonator structure, It is an integrated dielectric duplexer with an input/output coupling part formed at both ends, and an input/output common pin inserted between the two filter parts at a position for proper phase synthesis. .

That is, in the present invention, the insertion positions of the common input/output pins are set so that the impedance becomes infinite (open state) at the center frequency of the opposing filter section.

[Function] As described above, in the present invention, the distance between the input/output common pin and the two resonator holes closest to it is set to a dimension that allows proper phase synthesis, so the dielectric block is metallized and the input/output common pin is set to a dimension that allows proper phase synthesis. By inserting a pin, a phase-synthesized result can be obtained. This greatly simplifies the adjustment work.

Furthermore, even when inserting the device into a metal casing, only one dielectric block needs to be attached, so the casing structure can be simplified and downsized, and the assembly work is also extremely simple. Furthermore, since coupling capacitors, coupling lead wires, etc. are not required in the common area, the number of parts is reduced, and the work for installing or connecting them is also reduced, making it extremely simple.

[Embodiment] FIG. 1 is a perspective view showing an embodiment in which an integrated dielectric duplexer according to the present invention is applied to an antenna duplexer. This antenna resonator 30 has a configuration in which a transmitting side filter section 32 and a receiving side filter section 34 having a multistage dielectric resonator structure are continuously integrated in the longitudinal direction. In this embodiment, the transmitting side filter section 32 and the receiving side filter section 34 both have a three-stage configuration.

In the longitudinal direction of a substantially rectangular parallelepiped dielectric block 36 made of a sintered body of a high dielectric constant ceramic such as barium titanate,
Three resonator holes 38 are provided for each of the two filter sections 32, 34, and a coupling puppy 40 is provided between them.

Also, holes are formed at both ends and in the center for inserting input/output pins. and dielectric pro.

The conductor layer 4 is formed by metallization etc. on the 5 surfaces of the resonator hole 38 except for one surface where the resonator hole 38 is opened.
2 is formed.

In the drawings, in order to clearly show the extent of the conductor layer 42, minute dots are added to areas where the conductor layer is not formed and the dielectric base is exposed as it is. Furthermore, although the conductor layer 42 is depicted as having a considerable thickness, it is actually an extremely thin layer obtained by baking silver paste or the like.

In such a dielectric resonator structure, the resonant wavelength is four times the length of the resonator hole (the length of the portion where the conductor layer is formed), so the dimension of the dielectric block 36 in the resonator hole length direction is For example, if the center frequency fI on the transmitting side is 835 MHz and the center frequency fllK on the receiving side is 880 MHz, the resonator hole length of the transmitting side filter section 32 is determined according to the required center frequency. Filter part 3
It is desirable to design the dielectric block 36 in advance to have a stepped structure so that it is longer than the resonator hole length of No. 4.

The holes located at both ends of the dielectric block 36 have input/output pins 4 connected to the transmitting circuit and the receiving circuit, respectively.
4 is inserted, and an input/output common pin 46 connected to the antenna is inserted into the center hole.

Now, as is clear from the above description, the present invention is significantly different from the prior art in that two types of filter sections 32 and 34 with different center frequencies are continuously integrated in the longitudinal direction,
The common input/output pin 46 is inserted at a position where proper phase synthesis is performed between both filter sections 32 and 34.

The insertion position of the input/output pin 46 can be determined as follows. First, as shown in FIG. 2A, consider a structure in which the transmitting side filter 50 and the receiving side filter 52 are independent as in the conventional case. When attempting to phase synthesize both filters 50 and 52, the input/output pin 54 of the transmitter side filter 50 has an input/output pin 54 whose impedance becomes infinite at the center frequency of the receiver side, separately from the resonator hole and the coupler hole. Similarly, for the receiving side filter 12, a distance Y1 between the input/output pin 58 and the resonator hole 6o is determined so that the impedance becomes infinite at the center frequency of the transmitting side. And the distance X+ obtained in this way
, Y+ as shown in FIG. The distances Xt and Yt in the case of integration are obtained by multiplying x, y by a certain coefficient k. This coefficient varies depending on the bandwidth of the filter, etc., but if the relationship between the two is determined in advance through experiments, it is possible to easily design the coefficient based on that data.

With the above configuration, it is possible to obtain an integrated antenna resonator with appropriate phase synthesis.

FIG. 3 shows another embodiment of the invention.

This embodiment is an example in which the input/output coupling portion between the transmitting circuit and the receiving circuit is performed via a coupling capacitor 48. These coupling capacitors 48 are provided on the open ends of the resonator holes located at both ends. The rest of the configuration may be the same as that of the embodiment shown in FIG. 1, so corresponding parts will be denoted by the same reference numerals and a description thereof will be omitted.

Although two preferred embodiments of the present invention have been described in detail above, it is important to note that the present invention is not limited to only these configurations. The number of stages of the filter sections on the transmitting side and the receiving side is not limited to three stages, and in the above embodiment, the number of stages is f.

>rrx, the reverse n r tx > f
1x17), the relationship between the resonator hole lengths of the dielectric block and the striking step structure may be reversed.

The above embodiment is an example in which the present invention is applied to an antenna duplexer, but it can also be applied to a duplexer between a local filter section and a receiving side filter section used in a circuit.

[Effects of the Invention] As described above, the present invention has a configuration in which two types of filter sections with different center frequencies are successively integrated, and an input/output common pin is inserted at a position between both filter sections for proper phase synthesis. A single dielectric resonator needs to be manufactured, molding and conductor layer formation are only required for one piece, there is no need for coupling lead wires or coupling capacitors in common areas, and the casing can be made from a simple car. This has the effect of making assembly extremely easy due to the reduction in the number of parts and the simplification of the structure.

In addition, there is no need to adjust coupling capacitors, coupling lead wires, etc. one by one in the common area, and manufacturing is completed with proper phase synthesis, which has the excellent effect of greatly reducing the number of adjustment steps.

As a result of reducing manufacturing and adjustment man-hours,
It is possible to significantly reduce costs, and there is also the advantage that the overall size can be reduced by simplifying the structure of the common parts.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the antenna duplexer to which the present invention is applied, FIGS. 2A and B are explanatory diagrams each showing how to determine the position of the input/output common pin, and FIG. FIG. 4 is a perspective view showing another embodiment, and FIG. 4 is a perspective view showing an example of the prior art. 30... Antenna duplexer, 32... Transmitting side filter section, 34... Receiving side filter section, 36... Dielectric block, 38... Resonator hole, 40... Coupler hole, 42
...conductor layer, 44...input/output pin, 46...input/output common pin. Patent applicant: Fuji Electrochemical Co., Ltd. Representative: Minoru Shigemi Figure 2, Figure 3

Claims (1)

[Claims] 1. Multi-stage dielectric resonator structure with different center frequencies 2.
The filter part of the seed is continuous and integrated in the longitudinal direction,
In addition to forming an input/output coupling section at both ends, an input/output common pin is inserted in the middle of both filter sections at a position where the phases are combined so that the impedance becomes infinite at the center frequency of the other filter section. Features an integrated dielectric duplexer.