JPS6320161Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a case fixing structure for a dielectric coaxial TEM resonator.

Dielectric resonator devices and dielectric filters using conductor blocks as cases are known. Here, since each dielectric resonator is placed in a hole provided in the conductor block, the dielectric resonator can be fixed at an accurate position and characteristics as designed can be obtained. However, in order to insert the dielectric coaxial TEM resonator and fix it electrically and mechanically, a conductive adhesive is applied to the inner surface of the hole and/or the outer conductor of the dielectric coaxial TEM resonator, and the resonator is forced into the hole. The resonator must be inserted into the resonator, making it difficult to securely bond the resonator, and conductive adhesive may adhere to unnecessary locations, such as the open end surface of the resonator, adversely affecting the characteristics.

The purpose of this invention is to reliably electrically connect the outer conductor of a dielectric coaxial TEM resonator and the case.

Another purpose of this invention is to reduce the amount of expensive conductive adhesive used.

Another purpose of this invention is to improve work efficiency.

This idea involves fitting a dielectric coaxial TEM resonator, in which a solid dielectric exists between the inner and outer conductors, into a hole made in a conductor block as a case, and opening a part of the inner wall of the hole onto one side of the conductor block. The outer conductor of the dielectric coaxial TEM resonator is exposed through the opening, and the outer conductor from the open end of the opening is bonded to the case using a conductive adhesive. The case has a fixed structure.

Examples of this invention will be described below with reference to the drawings.

Figure 1 shows the 1/4 wavelength dielectric coax used in the example.
This is a cross-sectional view of a TEM resonator 1, in which a cylindrical (cylindrical, rectangular cylinder, etc.) body 2 made of a titanium oxide ceramic dielectric or the like is coated with silver paste by baking or electroless copper plating on the inner wall surface and outer peripheral surface. , an inner conductor 3, and an outer conductor 4, and an electrode 5 for short-circuiting the inner conductor 3 and the outer conductor 4 is formed on the entire right end surface in the figure in the same manner.
In order to connect the inner conductor 3 to the outside, a metal rod terminal 6 having a stopper collar is inserted into the center hole from the open end as necessary, and at this time, the terminal 6 and the inner conductor 3 are bonded together using conductive adhesive. It will be glued.
2 to 4 are a plan view, a side view, and a bottom view, respectively, of a dielectric filter to which an embodiment of this invention is applied. In FIG. 2, 10 is a main case, which is formed by hollowing out holes 11, 11, 11 in a rectangular parallelepiped conductor block made of, for example, duralumin. Reference numeral 12 denotes a capacitor, which has a structure in which capacitor electrodes 14 and 15 are provided on opposing principal planes of a disc-shaped ceramic dielectric 13. Two capacitors 12 are soldered to the terminal 6 of each resonator 1 with their axial directions aligned. The center conductor of the input coaxial connector 16 provided on one side of the main case and the first stage resonator 1
The input capacitor 12 of the first stage resonator 1 is connected to the output capacitor 1 of the first stage resonator 1 by a wire 17.
2 and the input side capacitor 12 of the second stage resonator 1 are connected by a wire 18 which is insulated through a hole provided between the holes 11 and 11, and the output side capacitor 12 of the second stage resonator 1 12 and the input side capacitor 12 of the final stage resonator 1 are connected by an insulated wire 19 inserted into a hole provided between the holes 11, 11, and the output side capacitor 1 of the final stage resonator 1
2 and the center conductor of an output coaxial connector 20 provided on one side of the main case are connected by a wire 21. Therefore, the filter shown in FIG. 2 is a bandpass filter. A square opening 21 is provided on one of the main side surfaces of the main case 10, and the outer conductors 4, 4, 4 of the resonators 1, 1, 1 are exposed. The upper edge of the opening 21 in the figure and the outer conductor 4,
4, 4 are bonded with conductive adhesive 22,
The lower edge of the opening 21 in the figure and the outer conductor 4, 4, 4
and are bonded to each other with a normal epoxy adhesive 23 if necessary. The area near the upper edge of the opening 21 in the figure is near the open end of the resonator 1, and the outer conductor 4 and the main case 10 must be electrically connected well in this area. On the other hand, since the area near the lower edge of the opening 21 in the figure is near the short-circuited end of the resonator 1, there is no problem even if an insulating adhesive is used in this area.
Note that 24, 24, 24 are screw holes provided in the main case 10. Screws are engaged with the screw holes 24, 24, 24 until the adhesives 22, 23 harden, and the resonators 1, 1, 1 are connected to the holes 11 with their tips. , 11, 11 temporarily. After curing, remove the screws. Thereafter, at least both the opening 21 and the hole 11 are covered with a suitable cover.

5 and 6 are a side view and a plan view, respectively, showing a band rejection filter to which a second embodiment of the present invention is applied. The main case 50 has almost the same structure as the main case 10, except that an opening 21 is provided in the recess 51 to accommodate coaxial cables 60, 61 and a metal plate 70, which will be described later. On the other hand, one electrode (lower electrode) of a capacitor 12 is connected to the tip of the inner conductor on the open end side of the resonators 1, 1, 1. coaxial cable 60,
61 is made of semi-rigid cable with a length of 1/4 wavelength and folded into a loop. Since the main case 50 cannot be soldered, four holes are provided in the solderable metal plate 70, and the center lines 62, 63 of the cables 60, 61 are inserted into the holes.
0 and 61, and the outer conductor of the semi-rigid cable is inserted into the metal plate 70.
It is electrically and mechanically attached to the main case 50 with screws 80 and 81. The main case 50 is provided with a hole through which the tips of the center lines 62, 63 of the cables 60, 61 and the tips of the insulators 64, 65 come out into the holes 11, 11, 11. The input coaxial connector 16 is connected to the other electrode (upper electrode) of the capacitor 12 of the first stage resonator 1.
One end of the wire 91 and the center line 62 of the cable 60 are connected to the center conductor of the cable 60, and the center line 62 of the cable 60 is connected to the other electrode (upper electrode) of the capacitor 12 of the second stage resonator 1. The other end of the cable 61 is connected to one end of the center line 63 of the cable 61, and the cable 61 is connected to the other electrode (upper electrode) of the capacitor 12 of the final stage resonator 1.
A wire 92 connected to the other end of the center line 63 of the output coaxial connector 20 and the center conductor of the output coaxial connector 20 is connected. As in the previous example, at least both openings of the recess 51 and the hole 11 are covered with appropriate covers.

As is clear from the above examples, according to this invention, not only can a dielectric resonator be accurately positioned using a case made of conductive blocks, but also
The dielectric resonator and the case can be reliably fixed using the minimum necessary amount of conductive adhesive, and the work efficiency is high, so the cost of the product can be reduced.

[Brief explanation of the drawing]

Figure 1 shows the 1/4 scale used in the embodiment of this invention.
Cross-sectional view of wavelength dielectric coaxial TEM resonator, Figure 2~
FIG. 4 is a plan view, side view, and bottom view of a dielectric filter to which one embodiment of the present invention is applied, and FIGS. 5 and 6 are band rejection filters to which a second embodiment is applied. FIG. 2 is a side view and a plan view. 1...1/4 wavelength dielectric coaxial TEM resonator, 10,
50... Main case, 11... Hole, 21... Opening, 22... Conductive adhesive.

Claims (1)

[Scope of utility model registration request] A dielectric coaxial TEM resonator, in which a solid dielectric exists between the inner and outer conductors, is inserted into a hole made in a conductor block as a case, and a part of the inner wall of the hole is opened on one side of the conductor block to conduct the dielectric. body coaxial
Dielectric coaxial, characterized by exposing the outer conductor of the TEM resonator through the opening, and bonding the outer conductor near the open end of the opening and the case with a conductive adhesive.
TEM resonator case fixing structure.