Band-stop filter circuit suitably made into monolithic microwave

Details Band-stop filter circuit suitably made into monolithic microwave Band-stop filter circuit suitably made into monolithic microwave

1991-12-24

1993-04-13

Dzierzynski, Paul M.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333176, 333202, H03H 707, H01P 120

Patent

active

052026515

ABSTRACT:
An image band-stop filter circuit includes a transmission line formed on a substrate of GaAs and a T circuit connected in parallel to the transmission line and having a high pass filter characteristic. The T circuit includes series-connected first and second capacitances connected in parallel to the transmission line and a stub having one end connected to a node between the first and second capacitances and the other end short-circuited. The stub has a line length which becomes inductive in an image signal band to be removed. As a result, the lengths of the transmission line and the stub can be reduced to enable the band-stop filter circuit to be made into a MMIC with ease while achieving an excellent signal transmission characteristic.

REFERENCES:
patent: 4443772 (1984-04-01), Schwarzmann
patent: 4635005 (1987-01-01), Kaminsky
patent: 4885562 (1989-12-01), Ouvrard et al.
patent: 5065117 (1991-11-01), Yoshimasu
patent: 5095285 (1992-03-01), Khatibzadeh
K. Honjo, et al., "X-Band Low-Noise GaAs Monolithic Frequency Converter" IEEE Transactions on Microwave Theory and Techniques, vol. MTT-33, No. 11 Nov. 1985, pp. 1231-1235.

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