Dielectric filter having inter-resonator coupling including both

Details Dielectric filter having inter-resonator coupling including both Dielectric filter having inter-resonator coupling including both

1992-04-21

1994-06-21

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333219, H01P 1203

Patent

active

053231287

ABSTRACT:
A small and thin plane type narrow-band dielectric filter to be used for a portable telephone and the like, includes a plurality of end short-circuited strip line resonators having a length of about quarter-wavelength formed parallel and closely to each other on a first dielectric substrate and directly magnetically coupled to each other. The thus formed strip line resonators are partially bonded to parallel plane capacitor electrodes formed on a second dielectric substrate in respective overlapping areas thereby electrically coupling the strip line resonators through the parallel plane capacitors, so that the inter-resonator coupling can be reduced due to the fact that it is achieved in combination with the magnetic coupling and the electrical coupling.

REFERENCES:
patent: 4418324 (1983-11-01), Higgins
patent: 4703291 (1987-10-01), Nisikawa et al.
patent: 4757288 (1988-07-01), West
patent: 4785271 (1988-11-01), Higgins, Jr.
Matthaei et al., "Microwave Filters, Impedance Matching Networks, and Coupling Structures", pp. 497-506, 1980.

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