High-frequency filter having increased mechanical strength

Details High-frequency filter having increased mechanical strength High-frequency filter having increased mechanical strength

1992-05-29

1994-01-04

Gensler, Paul

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

3332191, 333238, 501103, H01P 1201

Patent

active

052764125

ABSTRACT:
A high-frequency filter of the type having a plurality of resonators open at least at one end thereof, a dielectric board forming an input/output coupling and an interstage coupling, and a case for holding therein the resonators and the dielectric board, wherein the dielectric board is made of a ceramic having a critical stress intensity factor K.sub.1c of not less than 5 MPa.multidot.m.sup.1/2 and a dielectric dissipation factor tan. .delta. of not exceeding 1% in a working frequency band of said high-frequency filter, and wherein electrodes are provided on the dielectric board to form an input/output coupling capacity and an interstage coupling capacity. The high-frequency filter of the foregoing construction has the advantage of an excellent mechanical strength which is capable of withstanding severe mechanical loads such as falling impacts or various stresses.

REFERENCES:
patent: 4900701 (1990-02-01), Morishita et al.
patent: 5068072 (1991-11-01), Horinouchi et al.
patent: 5082809 (1992-01-01), Hayashi
patent: 5122487 (1992-06-01), Hayakawa et al.
patent: 5180696 (1993-01-01), Inoue
Stevens, An Introduction to Zirconia, Magnesium Elektron Publication, No. 113, Magnesium Elektron Ltd., Jun. 1983.

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