Multi-passband filter

Details Multi-passband filter Multi-passband filter

1997-11-04

1999-11-16

Ham, Seungsook

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333203, 333206, 333204, H01P 512, H01P 1205, H01P 1203

Patent

active

059865210

ABSTRACT:
A multi-passband filter includes a dielectric member (1), a plurality of resonant lines (12a-12c,13,14a-14d,15a-15c) provided within or on the dielectric member (1) and the resonant lines (12a-12c,13,14a-14d,15a-15c) are coupled to adjacent resonant lines so that a plurality of resonators are provided. At least one pair of resonant lines (12a-12c,13,14a-14d,15a-15c) are interdigitally coupled to each other in such a manner that the open ends and short-circuited ends of said resonant lines (12a-12c,13,14a-14d,15a-15c) are located in opposite directions with respect to each other, thereby providing a band-elimination filter. At least one pair of said resonant lines (14a-14d) may be comb-line coupled to each other in such a manner that the open ends and short-circuited ends of said resonant lines (14a-14d) are located in the same direction with respect to each other, thereby providing a band-pass filter. The multi-passband filter requires only a limited space to dispose the band-elimination filter in the filter. It is unnecessary to provide a phase shifter between the band-elimination filter and an input/output terminal when the band-elimination filter and the other filter are combined to input or output signals through a common input/output terminal.

REFERENCES:
patent: 5191305 (1993-03-01), Frost et al.
patent: 5712648 (1998-01-01), Tsujiguchi
Matsumoto, H., et al., "A Miniaturized Dielectric Monoblock Duplexer Matched by the Buried Impedance Transforming Circuit", IEEE MTT-S International Microwave Symposium Digest, Orlando, May 16-20, 1995, vol. 3, pp. 1539-1542, May 16, 1995.

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