Microstrip spur-line broad-band band-stop filter

Details Microstrip spur-line broad-band band-stop filter Microstrip spur-line broad-band band-stop filter

1991-07-03

1993-03-09

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333246, H01P 1203

Patent

active

051929279

ABSTRACT:
This invention discloses a band-stop filter, which has multiple sections of non-uniform and unbalanced microstrip transmission line. Such a structure can optimize the characteristics and maximize the matching frequency range. The total length of the filter can be reduced to a half of that of a conventional filter, and the insertion loss in the pass-band is reduced to a third of that of a conventional filter. Besides, this invention suggests a structure which does not require the inward etching of the microstrip line. Instead, the microstrip line itself is used directly as the building element of a spur-line filter. Thus, the tolerance in fabrication can be greatly relaxed without effecting the required characteristics.

REFERENCES:
patent: 4074214 (1978-02-01), Archholzer
patent: 5015976 (1991-05-01), Saka
Bates, "Design of microstrip spur-line band-stop filters", Microwaves, optics of Acoustics, vol. 1, No. 6, Nov. 1977, pp. 209-214.

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