JPS5910003A - Filter device - Google Patents

Abstract

PURPOSE:To obtain a miniaturized filter device which has a simple coupling structure of a capacitor with reduced generation of undesired coupling, by distributing dielectric coaxial resonators at both sides of a signal transmission line with their open terminals set opposite to each other for the filter device containing at least >=3 dielectric coaxial resonators having a dielectric substance between inner and outer conductors. CONSTITUTION:Two dielectric coaxial resonators having their open terminals set opposite to each other are connected to each other with a capacitor. At the same time, a shielding wall or a shielding plate is provided between said two dielectric coaxial resonators and another resonator of the same structure which is set in parallel to those two resonators. Both of these resonators are connected to each other with a capacitor through an opening drilled to the shielding wall or plate. The dielectric coaxial resonators 2 using coaxial TEM modes are distributed at both sides of a signal transmission line 1 with their open terminals set opposite to each other. These resonators 2 opposite to each other share a cut-off space 3, and a capacitor which is better than the inductive connection is used to secure a connection between stages. Thus a miniaturized and simple structure which is suited to a mass production with reduced generation of undesired coupling is secured for a filter device.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a filter device δ such as a filter or a duplexer using a co-moving resonator having a dielectric between inner and outer conductors.

For example, when constructing a duplexer, a filter device is constructed using an IIQIr four-wire device (hereinafter simply referred to as a "visiting body coaxial dual-wire device") that has an inductor between the inner and outer conductors. Two structures are possible.

One example is disclosed in Japanese Patent Application Laid-Open No. 56-57302.
The structure is shown schematically in FIG. 1, such as Cln. The structure shown in Fig. 2 is similar to that disclosed in Japanese Patent Application Laid-open No. II056-57304. Connect the inner conductor of the same l + tt + camera device 2 so that it hangs from the adjacent line 1, and connect the adjacent conductor + 1 to the body 11
Since the condensing capacitor C is connected between the inner conductors of the coaxial resonator 2, there is a r on the open side of each dielectric coaxial resonator 2.
J, it is necessary to provide a cutoff sky 1i4J 3. Cut off here! The dimension and shape are determined so that the adjacent dielectric bodies 1 and 2 are not coupled by the magnetic wave, and therefore the 14 adjacent dielectric bodies 1 and 11
The 1+ Ju oscillators 2 are coupled together by a coupling capacitor C. However, from time to time, unnecessary coupling may occur due to leakage signal components propagated to the inner surface of the case forming the cut-off space.

In addition, each dielectric coaxial resonator must have one cutoff space, which leads to CI fatigue, which hinders miniaturization. Second
In the case shown in the figure, the signal propagation path 1 and the dielectric coaxial resonator 2 are arranged so that their axial directions coincide, and the open ends of the 1/4 wavelength dielectric coaxial resonator 2 are connected with a capacitor C. and the shorted ends are magnetically coupled. Even with this structure, the open end side of the dielectric coaxial resonator 2 requires the same +4+c cutoff 2fu16 as in the example of FIG. 2 can share one cutoff space 3, so the case can be made smaller accordingly.In addition, unnecessary connections are also more difficult. It becomes necessary to adopt a part of the intermediate inductive (magnetic) coupling fFjul, and if we are to summarize it in terms of capacitors, we have to use a 1/2 wavelength main axis resonator in part, which leads to miniaturization. C comes due to retrograde defects.

・The cut-off space required inside the case is less than the conventional one, and there is no undesirable coupling, and all C capacitors are equal to each other.
It is an object of the present invention to provide a small filter family fIf that can take the form of g.

Another object of the present invention is to provide a filter having a capacitor structure that is easy to manufacture.

That is, the essence of this investigation is that there is an attraction between the inner and outer conductors:
At least three or more g adult coaxial resonators having a body +1-
11-= In the filter device with 0゛〇〉〉〉〉〉〉〉〉〉〉〉〉〉〉〉〉〉〉〉〉〉〉〉〉〉〈〉〈〉〉〉〉〉〉〉〈〉〈〉〈〉〈〈〉〈〉〈〉〈〉〈〉〈〉〈〉〈〉〈〈〉〈〉〈〉〈〉〈〈〈〉 By doing this, it is possible to share one cut-off beam between two visiting body coaxial binoculars facing each other across the signal propagation path, and to connect the binding body coaxial binoculars + hM binoculars with a capacitor. In the filter family 1d as a samurai, two !4 bodies with the same amount + qll + ba are coupled with the free end and the open end with a capacitor, and a dielectric coaxial resonator and one tom are installed. A shield wall or a shield plate is provided between the dielectric coaxial resonator and another dielectric coaxial resonator, and both dielectric coaxial resonators are coupled to each other by a capacitor through an opening provided in the shield wall or shield plate. This is a filter with a characteristic σ() that decreases.

The above objects and ten other objects and features of the invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

FIG. 3 illustrates the basic idea of this invention.

In this way, the dielectric coaxial resonators 2 that utilize coaxial TKM mode resonance are arranged on both sides of the signal propagation path 1 so that their open ends face each other. When coupled with a capacitor, which is more advantageous than inductive coupling, the arrangement becomes extremely rational, and a filter is obtained that is small, has no unnecessary coupling, and has a simple structure that is suitable for steep and vertical coupling.Dielectric Coaxial Resonance Although the device 2 itself is well known, please refer to FIG. 4 just in case.
The inner wall surface of a cylindrical (cylindrical, rectangular) body 21 consisting of an i-body, etc.
On the outer circumferential surface: Apply limited paste or apply no paste.

・! The inner conductor 22 and the outer four bodies 23 are formed by the 1゛ζ copper plating method, and the turret 24 for shorting the inner conductor 22 and the outer conductor 23 is formed by the same method on the entire curved bottom surface in the figure. In order to connect the C1 inner conductor 22 to the outside, a metal rod-shaped terminal 26 having a stopper collar 25 is inserted into the center hole from the open end (top surface in the figure). For bond cutting, connect the I/-IC1 terminal 26 and the inner conductor 22 for C. Note that the terminal 26 can have other structures, but this is just one example. As shown in FIGS. 13 to 15, the terminal 90 includes a disc-shaped portion 91, a plurality of tongue-shaped contact portions 92 extending radially from the periphery of the disc-shaped portion 91, and a disc-shaped portion 91.
A metal piece is integrally formed with a tongue-shaped connecting part 93 with a C cut facing toward the center, and a stopper 94 extending radially from the periphery of the disc-shaped part 91 to the necessary minimum extent. 92 is
Bend the disc-shaped part 91 by about 90 degrees and bend the whole part in the shape of the letter "H" (to give it spring properties, the connecting part 93 is bent in the opposite direction to the contact part 92 with respect to the disc-shaped part 91).
C becomes. (See Figure 815 in Figure 14) When the contact portion 92 is inserted into the center hole of the dielectric coaxial coaxial device 2, the contact portion 92 is pressed against the inner conductor 22. A connection with the outside, such as a capacitor lead, is soldered to the connection portion 93, for example.

The shapes of the contact portion 92, the connection portion 96, and the stopper 94 are as follows.

FIGS. 5(f) and 5(f) show an embodiment in which the present invention is applied to a duplexer.

Figure 5 shows the internal layout of case 4.
1. -(The right half of oC is a part where six axial co-rooters 2 with equal inducers used for the first filter part are assembled in the configuration as shown in Fig. 6.The left half is a part of the second filter part. The six dielectric resonators 2 used in the filter section have a configuration approximately as shown in FIG. C1 has a configuration in which a trap consisting of a 5-stage band 110 overpass filter, one capacitor, and a 4^body/1q1) resonant dIT is added.
It is different from the first filter Bikawa (・4, but J-1,
The second filter part can be configured as desired depending on the situation.In the center of one of the side surfaces of the receiver of case 4, there are the first and second filter parts. A shared expression for the filter part of. An output connector 5 is provided in the center of one of the two shorter sides of the case 4, and an output connector 6 is provided in the center of the other short side of the case 4. is the second fill 2
A dedicated person for 7715 minutes, an output connector 7 is provided, and a strip line 8 is arranged from the output connector 5 to the center of the case 4.
, Of course, there is also °C which has a rotational pure/lok structure (^0th Li
The coupling capacitor used in the filter part of j'H is a dielectric material made of a ceramic disc 9 made of a Guiscreed, for example, a conditioned titanium thread as shown in FIG. .11 is set up for the sound of something like the K tit 10 t 11 of each of the reeds J 12 and 13., 1 Q rg is the same amount as the K tit 10 t 11.
1. In the Qinma PC, a metal shield plate 14 as shown in Fig. 47 is inserted and hardened.゛C has a length and width that reach the dielectric single-top coaxial resonator facing each other.
Provides a shielding function [opening or notch 15]
゛[C]
put. The metal shield plate 14 is a dedicated person. Output connector 6.
7 and the dielectric coaxial resonators connected to them (141)
Between the IJ tube line 8 and the dielectric coaxial resonator 14 in contact with them, as shown by the dotted line in Figure 5, a
0 shield plate 1 sheet metal 4 - integrally formed with base 4 C also 1^.

The same amount of common excavation equipment in the city is shown in Figure 8 in Case 4.
11: It is fixed as shown in . That is, case 4
The recess 16 +7Ji K is the recess 16 between each dielectric coaxial resonator whose cross section covers each peripheral surface of the 4-tube 4-l resonator.
is formed, and the wire mesh 17 exists between the surface of the recess 16 and the center of the pit. In other words, the wire mesh 17
Through the gap between C4 part 16 table 111f and dielectric material 41q1
After bonding the outer conductor 23 of 1 (Tatsui: ÷ 2) with, for example, an epoxy non-conductive R11 adhesive as necessary, use a wire mesh to connect the surface of the C recess 16 and the outside of the dielectric coaxial resonator 2. LttA conduction with the conductor 23 is established.
17 is preferable C because the line is sufficiently bent in the direction of 1v, and the cushioning properties are better, and the reliability is added to the hypochondriacal 41ton. -1°The length of the wire mesh 17 &-J attractant do not match the imager axis length, and the temperature is also good, and it partially exists at the open end d of the resonator. The center conductor of the output connector 5 is connected to the center conductor 81 of the strip line 8 by −I'n% K le , and the other end of the center conductor 81 of the strip line 8 is connected to the center conductor 81 of the strip line 8 via the first coupling capacitor C. The terminal 908 of the first stage of the filter part of 1 is connected to 4j and connected to C1. 1 co-pregnant organ (W-stage induction [1-c interbody space 11
Jl; 1M14H and the terminal 90 of the terminal 90 (with their end faces facing each other and connected to C1-) are connected to each other via the second coupling capacitor 0, and Ct is connected. 21st Mongote 1/Mystery 2
1 μm + ii + Terminal 90 of J-Tatsuki and 31st step 11℃ same amount + 1'lll both JII'4 device (2nd step - dicenter same amount 矧 ITKM both 1 tool is lA Set σ Tsum (
(0ru) terminal 90 and lf Miiro capacitor C
is connected to J1 and CIn. 6th coupling capacitor c';
Sword cutter 15] is located within C1^. The third and fourth stage coaxial coaxial devices are the same as the first stage and second stage described above. In the same way as in the case of ``2nd stage and 3rd stage of 1st stage'', the 3rd and 6th stage's visiting body times Ihh weapons and heavy equipment are connected in the same way as in the case of the 1st stage and 2nd I attack of 2 consecutive stages. Then, the terminal 90 of the dielectric coaxial resonator of the long section I and the center conductor of the optional 6L1 power connector are connected by a coupling capacitor C.The second filter section is almost the same as the first filter. Terminal 9o of the third-stage equivalent axis TKM resonator valves the coupling capacitor C to the third stage.

The terminal 90 of the output connector 7 is connected to the main body of the output connector 7, and the terminal 90 of the first filter; It is connected to the central body of the output connector 7 through the capacitor CO and functions as a trap and becomes C1/-.

The dielectric coaxial resonator is installed in case 4 by the means shown in Figure 8.
After the case 4 is housed and fixed, and the wire connections like the upper frame are removed, a metal holding plate 30 as shown in FIG. 9.10 is screwed into the case 4. In this case, five female threads 41 to 45 are formed on the case 4, and there is a metal holding plate 30.
Screw holes 61 to 35 are formed in corresponding portions.

A strip line 8 and a strip line 8 and a strip line 8 with a screw hole 33 located on an extension thereof, a strip line 8 and a front section 36 between the parallel resonators; 37 is provided in the width direction, and both sides have cover portions 8 and 38 that fit into the connector 6 and 7 mounting portions 46 of the case 4 and shut off the inside and outside of the C case. Reference numeral 39 denotes an opening, which has a size and shape that allows the capacitor C to be attached and to be tamed.

As shown more clearly in FIG.
There is 11, (KeC.The cover part 38.38 is '[)Jl+-LL'r' by adjusting this area to its external shape. If you hold down the gold leaf and screw one 30th eye into case 4, it will protrude upwards from the seduction 47 of case 4 (^yo fi'f,
:? Do t. The outer conductor of the 1 dielectric and tl+ resonator is connected to the case through gold steel, and the dielectric and the same amount of axial guarantor is placed inside the case. Soshi(
A thin metal plate 50 which is to be combined with the outer shape of the case 4 as shown in FIG. 11 is attached to the edge 47 of the case 4 and the metal holding plate 3DK using adhesive or tape.

As is clear from the above examples, this invention
For use with at least three or more dielectric coaxial detectors with a dielectric element between the outer conductors (to the filter device). By arranging the open ends so that they face each other in the x1 direction, two diagonal and equal axis co-axial devices facing each other across one word propagation path share one cutoff space, and F, f5 The two resonances of the same body are connected to each other by a capacitor, and the filter device is made of a gold special ridge. A shield wall or a shield plate is provided between the d-equal axis co-contact rJ and the additionally installed IO co-equal axis unit, and this shield wall Or through the opening provided in the shield plate. Only the cut-off space is required, and the topography is made small, and unnecessary coupling is also caused, and the coupling groove 1-1 is also a capacitor coupling. Then, -iq is obtained, which can be converted into the conventional example.

4,
The figure shows 5 sum j x 1 shi), Shikoku;
kl, schematic explanatory diagram of this invention, Figure 4 r [verse r(f,
Figure 5, a top view of the first Uramachi vibrator, is the fruit of this invention.
A1i j'ylJ's internal view 711214, Figure 6 is a diagonal 711 view of the capacitor, ・Kun 7 Figure 4, ↓ IE side view of the 4th class shield plate, ・Figure 48 is the 11th Hideshi body same 101 (of the shaker) Installation structure explanatory diagram, iυ9 diagram & J: Temporary plan view of gold 1 and 4 holding down, Figure 10 is a 1m view of the same side, Figure 11 is a plan view of the thin metal plate, Figure 12 is a side view of 1911 implementation from t.
FIG. 13 is an exploded view of the terminal, FIG. 14 is a flat view, and FIG. 15 is a side view.

1 is the TO' propagation path, 2 is the 114 city body 1t axial resonator,
6 is a cut-off space, 14 is a metal shield plate, 9o is a terminal, and C is a capacitor.

l Patent Applicant Mi Ni Company Murata Manufacturing Co., Ltd. Fig. 1 Fig. 2 Fig. 15 --- Fig. 3 Fig. 4 Fig. 6 Fig. 30 J'/ Fig. 11 Fig. 12 Fig. 13 Procedural amendment 5 7 i1]] month 1
+1 1981 Patent Application No. 118890 2
, Name of the invention Filter device 3, Person making the correction October 2G, 1981 (shipment date) 5. ? No increase in the number of inventions due to ID amendment7, engraving of the description of the contents of the amendment (no change in the contents) Procedures Amendment Issued October 25, 1982 ['' Commissioner of the Patent Office 1, Indication of the case 1988 Pat. 1
Target of i-correct °″ Ming ■ 1 “Detailed explanation of Bimei” column 1, contents of correction

Claims (1)

[Claims] In a filter device using at least three dielectric coaxial resonators having a dielectric material between the inner and outer conductors, the dielectric coaxial resonators are separated on both sides of a signal propagation path and the dielectric coaxial resonators are opened. By arranging the ends to face each other, two dielectric coaxial resonators facing each other across the signal propagation path share one cutoff space, and the dielectric coaxial resonators are coupled with each other using a capacitor. A filter device odor characterized by
[, Two dielectric coaxial resonators whose open ends face each other are coupled by a capacitor, and another dielectric coaxial resonator is installed in parallel with the dielectric coaxial resonator! ! 11 A shield wall or a shield plate is provided between the resonator, and the temperature of both dioxidants and I
l! IIl are connected to each other by a capacitor and 'CI
A filter device characterized by Q.