JPH0287801A - Dielectric filter - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a dielectric filter used as a band pass filter in radio equipment and the like.

Conventional technology In recent years, dielectric filters that use a dielectric resonator in the resonance part of the passband filter for intermediate frequency amplification in signal transmission systems and a dielectric substrate in the coupling capacitor part have been widely used in high-frequency wireless equipment, etc. .

A conventional dielectric filter will be explained below.

FIG. 5 is a side view of the dielectric film, and FIG. 6 is a sectional view taken along line c-c' in FIG. On a dielectric substrate 1, one end of which is attached to the through hole of a dielectric resonator 5, which is constructed by providing a through hole in the center of the dielectric and forming electrodes on the through hole, one end surface, and the outer peripheral surface. An electrode 2 forming a coupling capacitor is formed on the electrode 2 , and this electrode 2 is electrically connected to the dielectric resonator 6 .
A rod-shaped terminal 3 is inserted into a part of the dielectric substrate 1 so as to be perpendicular to the dielectric substrate 1, and the terminal 3 and the electrode 2 are connected by solder 4.

Problems to be Solved by the Invention In the conventional configuration described above, when soldering, the dielectric substrate 1 and the electrode 2 have different coefficients of thermal expansion, so stress is applied to the electrode 2 and the electrode 2 peels off, or the electrode 2 is damaged by the solder. 4, there was a problem in that the electrode area varied.

In order to eliminate the above-mentioned conventional drawbacks, the present invention aims to eliminate electrode peeling and provide a high quality and stable dielectric filter.

Means for Solving the Problems In order to solve the above problems, the present invention provides that one end of a dielectric substrate having electrodes forming a coupling capacitor is inserted into a through hole of a dielectric resonator, and the dielectric material is The structure is such that the terminal is crimped and connected to the electrode on the substrate.

Effects According to the above structure, there is no need to solder the electrodes and terminals, and since the electrodes and terminals are connected by crimping, there is no peeling of the electrodes, and a high-quality and stable dielectric filter can be provided.

Embodiments Below, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a side view of a dielectric filter according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken at Mu' in FIG. A dielectric substrate in which one end is inserted into the through hole of a dielectric resonator 6, which is constructed by providing a through hole in the center of a cylindrical or prismatic dielectric body, and applying electrodes to the through hole, one end surface, and the outer peripheral surface. An electrode 8 forming a coupling capacitor is formed on top of the electrode 7 . This electrode 8 is electrically connected to the dielectric resonator 6, and furthermore, a rod-shaped terminal 9 having an expansion part 11 in the middle part is inserted into a part of the electrode 8 of this dielectric substrate 7. The tip of the terminal 9 protruding upward is crimped to form a crimped portion 10 and connected to the electrode 8.

This crimping is done by rotating the caulking punch and gradually crushing the tip of the terminal 9.
The crimped portion 1 of the electrode 8 and the terminal 9 is
0 can be brought into close contact.

According to the first embodiment, there is no need to solder the terminal 9 and the electrode 8, and peeling of the electrode 8 can be prevented.

In the above embodiment, the shape of the crimping portion 1o is a flat plate, but it may have any shape as long as it is ζ crimped, and the same effect as in the above embodiment can be obtained.

Further, the shape of the terminal 9 may be any shape, such as with or without a taper, and the same effect as in the above embodiment can be obtained. A second embodiment in which a tapered terminal 9 is used will be described below.

FIG. 3 is a side view of the dielectric filter in the second embodiment, and FIG. 4 is a sectional view taken along line BB' in FIG. 3. An electrode 8 forming a coupling capacitor is formed on a dielectric substrate 7, one end of which is inserted into the through hole of the dielectric resonator 6. A tapered terminal 9, such as a conical shape with one end thicker than the other end, is inserted into the dielectric substrate 7 on which the electrode 8 is formed from the thinner end.

The terminal 9 protruding above the electrode 8 is crimped.

In this case, by forming the electrical conductor 8 from the upper surface of the dielectric substrate 7 to the inner circumferential surface of the hole into which the terminal 9 is inserted, it is possible to ensure crimping and conduction.

According to the second embodiment described above, by press-fitting the terminal 9 into the electrode 8, soldering between the terminal 9 and the electrode 8 is eliminated,
Peeling of the electrode 8 can be prevented.

Effects of the Invention The present invention eliminates soldering by crimping the terminal and electrode as in the above embodiment, and has the following effects.
There is no peeling of the electrodes, and a high quality and stable dielectric filter can be provided.

[Brief explanation of the drawing]

@ Figure 1 is a side view of a dielectric filter according to an embodiment of the present invention, Figure 2 is a sectional view taken along line AA' in Figure 1, Figure 3 is a side view of another embodiment, and Figure 4 is a side view of a dielectric filter according to an embodiment of the present invention. 3 is a sectional view taken along line BB', FIG. 5 is a side view of a conventional dielectric filter, and FIG. 6 is a sectional view taken along line c-c' in FIG. 6... Dielectric resonator, 7... Dielectric substrate, 8... Electrode, 9... Terminal. Name of agent: Patent attorney Shigetaka Awano and one other person

Claims (1)

[Claims] A part of the dielectric substrate with an electrode forming a coupling capacitor formed on the top surface is inserted into the through hole of the dielectric resonator, a terminal is inserted into the part of the dielectric substrate with this electrode formed, and a terminal is inserted into the above electrode. A dielectric filter made by crimping and conducting.