Ceramic block filter having nonsymmetrical input and output impe

Details Ceramic block filter having nonsymmetrical input and output impe Ceramic block filter having nonsymmetrical input and output impe

1992-12-16

1995-04-11

Ham, Seungsook

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333 33, 455 82, H01P 1205, H04B 138

Patent

active

054062365

ABSTRACT:
Ceramic block filters can be constructed to have non-symmetrical, i.e. unequal, input and output impedances. These filters can be used to eliminate impedance matching networks in radio communications devices. These impedance matching networks (22, 14) are precluded when the input and/or output of a ceramic block filter (100) is controlled by appropriate selection of the physical parameters of the block to achieve a direct impedance match between an adjacent circuit element and subsequent signal processing stages in the device.

REFERENCES:
patent: 4879533 (1989-11-01), de Muro et al.
patent: 4896124 (1990-01-01), Schwent
patent: 4937542 (1990-06-01), Nakataka
patent: 4954796 (1990-09-01), Green et al.
patent: 5208566 (1993-05-01), Kenoun et al.

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