JPS6247201A - Shared dielectric block - Google Patents

Abstract

PURPOSE:To reduce the man-hour for production considerably and to obtain a mechanically stable shared block by constituting plural filter parts on a single dielectric block and coupling filter parts by the second resonance element. CONSTITUTION:A pair of filter parts 102a and 102b are formed as one body on a single dielectric block 101. The second through hole 110 is formed in parallel with the first through holes 103 in the middle between the first resonance elements 105 placed in opposite end parts of both filter parts 102a and 102b. This through hole 110 is formed to have a diameter smaller than that of through holes 103, and a connecting electrode 111 is formed on its inside peripheral surface. The second resonance element 112 is constituted with this connecting electrode 111, an outer conductor 106, and a dielectric block 101. Magnetic field coupling is caused between filter parts 102a and 102b and they are coupled by the electric field generated among the connecting electrode 111 of the resonance element 112, inner conductors 104 of resonance elements 105 on both sides, and the outer conductor 106, thus constituting a shared dielectric block.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Application in Industry> The present invention relates to a dielectric duplexer used in, for example, a duplexer.

<Prior Art> FIG. 6 is a block diagram showing an example of a duplexer which is the background of the present invention. The duplexer 1 shown in this figure includes a first bandpass filter 2a for frequency f, and a second bandpass filter 2a for frequency r2.
It has a bandpass filter 2b. The input sides of both bandpass filters 2a, 2b are respectively connected to the common terminal 4 via the connection point 3, and the output sides thereof are respectively connected to the output horn terminals 5a, 5b, respectively. If the frequency fl is included in the frequency component of the high frequency signal input from the common terminal 4, the signal passes through the first band pass filter 2a and is sent to one output terminal 5.
It is derived to a. Similarly, if the signal component includes a frequency f, the signal is passed through the second band pass filter 2b.
and is led out to the other output terminal 5b.

FIG. 7 is a perspective view showing a conventional example of a bandpass filter used in the duplexer 1 as described above.

This conventional bandpass filter 2 is an integrally molded distributed constant type filter in which a plurality of resonant elements 7 are constructed from a single dielectric block 6. A plurality of through holes 8 passing through the dielectric block 6 in the same direction are formed at predetermined intervals, and an inner conductor 9 is formed on the circumferential surface of each through hole 8. On the other hand, an outer conductor 10 is provided on the outer peripheral surface of the dielectric block 6.
is formed. Further, in this conventional example, an electrode (not shown) is formed on one opening side end surface 6a of each through hole 8 to shorten both the inner and outer conductors 9,10. Further, the other opening-side end surface 6b facing the short-circuited end surface 6a is an open end surface on which no electrode is formed.

In the bandpass filter 2 configured in this way, each of the inner conductors 9 and the common outer conductor 10 act as a resonant element of λ.
A /4 type TEM coaxial resonator unit 7 is constructed for each through hole 8. A cavity-shaped or slit-shaped coupling hole 13 is formed between each through-hole 8.8, and each resonance element 12 is coupled by this coupling hole 13.

Input terminals 14 and output terminals 5 are inserted and fixed into through holes 8° 8 located at both ends of dielectric block 6, respectively. The input/output terminal 14.5 and the resonant element 7.7 at each end paired with the input/output terminal 14.5 are connected to the electrostatic charge generated by the interposition of the dielectric bushing 15 between each terminal 14.5 and the inner conductor 9. coupled via capacitance.

<Problems to be Solved by the Invention> When the distributed constant filter 2 having the above configuration is used as the bandpass filters 2a and 2b shown in FIG. The input terminals of each of the filters 2 a and 2 b are connected to each other using a connecting conductor such as a coaxial cable or a strip line. The connection configuration in this case is shown in FIG. When viewed from the connection point 3, such a connection conductor 16 has the frequency f1 of the other party.
or f, each of which is designed to have a length that corrects the shift in reflection phase so as to be in an oven state.

However, when such a connecting conductor 16 is used, a space is required to obtain the necessary electrical length, so the overall shape of the dielectric duplexer 1 becomes larger. Furthermore, since the dielectric block 6 and electrodes must be created for each filter 2, the number of manufacturing steps increases. Furthermore, since both filters 2a and 2b are combined, there is also a problem in mechanical strength.

Conventionally, as a solution to this problem, the common terminal and each input terminal are directly connected without using a connecting conductor 16 such as a coaxial cable or a strip line. There is a system in which the frequency and coupling coefficient of each resonant element 7 are changed to allow the filters 2a, 2b themselves to absorb the shift in the reflection phase from the other side, thereby achieving miniaturization.

However, in both of the above conventional examples, in order to configure a duplexer such as a dielectric duplexer, it is necessary to prepare two or more filters that are individually formed.
These filters must be connected using the above-mentioned means, and the problems of increased manufacturing man-hours and limited mechanical strength remain unsolved. These problems also apply to filters other than integrally molded filters.

In view of these conventional problems, the present invention reduces manufacturing man-hours and provides a mechanically stable dielectric duplexer by integrally configuring a plurality of filter sections using a single dielectric block. The purpose is to provide.

<Means for Solving the Problems> In order to achieve the above object, the present invention includes a plurality of inner conductors and a first resonant element in cooperation with each inner conductor in a single dielectric block. forming an outer conductor, and coupling each first resonant element to each other by a first coupling means to constitute a plurality of filter sections with a unit number of first resonant elements;
A second resonant element is located between the first resonant elements located at the ends of each filter section.
A through hole is provided, and a connection electrode is formed on the inner peripheral surface of the through hole, and the connection electrode and the outer conductor constitute a second resonant element, and the second resonant element and the second resonant element at the end of each filter section are formed. The present invention is characterized by a configuration in which a second coupling means is provided between one resonance element and a second coupling means for coupling the two.

<Example> Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIG. 1 is a partially cutaway perspective view of this embodiment.

The dielectric duplexer shown in this figure is used as a duplexer, and has a pair of filter sections 102a and 102b integrally molded into a single dielectric block 101.

This dielectric block 101 is made of, for example, titanium oxide (T10
2) It is integrally molded using a mold using a ceramic dielectric material, etc., and is formed into a rectangular parallelepiped shape.

This dielectric block 101 has a plurality of first through holes 103.
... are formed through the same direction. Each first through hole 10
An inner conductor 104 made of an electrode material such as silver (Ag) is formed on the inner peripheral surface of 3. Further, a first resonant element 1 is provided on the outer peripheral surface of the dielectric block 101 in cooperation with each of the inner conductors 104.
An outer conductor 106 constituting 05 is formed. An inner and outer cylindrical conductor 1 is provided on one opening side end surface 101a of each first through hole 103.
An electrode 107 that short-circuits 04 and 106 is formed. Further, the other opening-side end surface 101b opposite to the short-circuited end surface 101a is an open end surface on which no electrode is formed.

Therefore, each first resonant element 105 is configured as a λ/4 type TEM coaxial resonator unit by the dielectric block 101, each inner conductor 104, and a common outer conductor 106.

A first coupling hole (first coupling means) 108 is formed between each of the first through-holes 103, 103, which is a hollow or slit-shaped square hole. The shape and dimensions of the first coupling hole 108 are set so that the coupling coefficient between the first resonant elements 105 becomes a set value. Note that this first coupling hole 1
08 is not formed with an electrode, and may not be penetrated to the short-circuit end face 101a.

In this way, the first resonant elements 105 . . . coupled to each other by the first coupling holes 108 . The first resonant element 105... second filter section], 02a, and 102b are configured.

A first through hole 103 is provided in the center between the first resonant element 105 located at the opposite end of both filter portions 1.02a and 102b.
A second through hole 110 is formed in parallel with the second through hole 110 . This second through hole 110 is formed to have a smaller diameter than the first through hole 103, and a connection electrode 111 corresponding to the inner conductor 104 of the first through hole 103 is formed on its inner peripheral surface. Then, this connection electrode 111, outer conductor 106, and dielectric block 101
The second resonant element 112 is constituted by the above.

This second resonant element 112 and both filter sections 102a
, 1.02b, the first resonant element 105,1 located at the end of
05, the first resonant element 105 and the second resonant element 105, respectively.
A second coupling hole (second
A coupling means) 113 is formed. This second coupling hole 11
3 has the same structure and function as the first coupling hole 108.

The first . Second filter section 102
a, 1.02b, magnetic field coupling as shown in FIG. 2 occurs, and the connecting electrode 111 of the second resonant element 112
, are coupled by an electric field generated between the inner conductor 104 and the outer conductor 106 of the first resonant elements 105 on both sides, thereby forming a dielectric duplexer. In this case, the second resonant element 1
Reference numeral 12 is a common input section for both filter sections 102a and 102b, but since both filter sections 02a and 102b are composed of λ/4 type TEM coaxial resonators, the frequency of the duplexer is approximately 90°. I have an electric length. And, the separation of the common device is within 10% of the center,
In other words, (f2-fl)/((fl+f2)/2)≦0.1, where rl: frequency component passed by the first filter section 102a, r,
- If it is a frequency component that the second filter section 102b passes, the input terminal A of the second resonant element 112 is open. Therefore, the frequency component element 8. If it is within the range of f2 months, it will function as a duplexer without receiving the reflected phase of the other party.

As shown in FIG. 2, the direction of the magnetic field is determined by the direction of the inner conductor 104 of the resonant elements 105 and 112 to be coupled. The directions are opposite on both sides of the lit. In the TEII mode, the direction of the magnetic field is the same on both sides of the inner conductor of the resonant element, and with such a coupling structure, the T'E'+I mode, which is a spurious mode, does not occur.

The degree of input/output coupling is 1°, the second through hole 10a
, l'lO and the shape and size of the second coupling hole 113.

Also, 1st. The center frequency of the second filter is, for example, (2) An electrode is formed on the open end surface 101b side.

(2) A step is provided in the first through hole 103.

(2) Forming a small diameter hole near the first resonant element 105;

Even units of the same size can be changed in various ways using methods such as the above.

FIG. 3 is a plan view of main parts showing another embodiment of the present invention.

The dielectric duplexer shown in this figure has three or more filter sections 1021 in a single dielectric block.
are provided, and a second resonant element 112 is interposed between each filter section 102I.
02. ..., the structure of the second resonant element 112, and other structures are the same as those of the '1st embodiment, and the same components are given the same reference numerals and their explanations will be omitted. do.

FIG. 4 is a partially omitted plan view showing still another embodiment of the present invention. The dielectric duplexer shown in this figure includes a pair of filter sections 102a and 1 in a single dielectric block 101.
02b is provided, both filter parts +02a and 102t+ are arranged in parallel in a state facing each other, and both filter parts 102
A common input section configured similarly to each of the above embodiments is formed between the first-stage resonant elements 1.05 and 105 of a and l02b in a direction perpendicular to the parallel direction of both filter sections 102a' and 1.02b. It is. In this embodiment, in order to set the attenuation amount to the standard value, both filter sections 102a,
It is desirable to provide a slit 114 between the filter parts 102b and the output part side of each filter part +02a and 102b. Further, an outer conductor 106 is continuously formed on the side surface of one inch of the dielectric block constituting this slit 114. The rest of the configuration is the same as in each of the embodiments described above, and the same components are given the same reference numerals and their explanations will be omitted.

Furthermore, in this embodiment, both filter sections 10'2g, 102
The coupling configuration of the output part of b is a slit-shaped coupling hole 115,
115, but in addition, for example, as shown in FIG.
A pin terminal 117 having a dielectric bushing 116 is inserted into 04° 104, and this pin terminal 117 and inner conductor 104 are connected to each other.
The coupling may be performed by capacitance generated between the two.

Further, as for the coupling form between the respective resonant elements 105 in each of the embodiments described above, any coupling form other than the capacitive coupling described above may be used except for the external coupling of the common element/output section.

<Effects of the Invention> As described above, according to the present invention, a plurality of filter sections are configured in a single dielectric block, and each filter section is coupled by a second resonant element, so that unlike the conventional method, Furthermore, there is no need to combine individually formed filters. Therefore, the number of manufacturing steps can be significantly reduced, and a mechanically stable duplexer can be obtained.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the present invention;
The figure is a partially cutaway perspective view of this embodiment; FIG. 4 is a partially omitted plan view showing still another embodiment of the present invention, FIG. 5 is a vertical cross-sectional view of main parts showing a modification of the coupling form between the first resonant elements, and FIG. 6 is a diagram showing a duplexer. FIG. 7 is a block diagram showing an example, FIG. 7 is a perspective view of a conventional example, and FIG. 8 is a block diagram showing another example of a duplexer. 102a, 102b, 102.・-・Filter part, 10
1... Dielectric block, 103... First through hole, 1
04... Inner conductor, 105... First resonant element, 106... Outer conductor, 108... First coupling means, 110... Second through hole, Lll... Connection electrode, 112 ...Second resonant element, 113...Second coupling means.

Claims (1)

[Claims] (1) A single dielectric block is provided, a plurality of first through holes are formed in this dielectric block in parallel with each other, an inner conductor is formed on the inner circumferential surface of each first through hole, and the dielectric An outer conductor that cooperates with each of the inner conductors to form a first resonant element is formed on the outer peripheral surface of the block, and a first coupling means is provided between each of the first resonance elements, and the first coupling means A plurality of filter parts are formed by a number of first resonant elements coupled to each other, and a second through hole parallel to the first through hole is formed between the first resonant elements located at an end of each filter part. death,
A connecting electrode is formed on the inner circumferential surface of the second through hole, and the connecting electrode and the outer conductor constitute a second resonant element, and the second resonating element and the ends of each of the filter parts are connected to each other. A dielectric duplexer comprising a first resonant element and a second coupling means for coupling the two.