Quasi-elliptic function microstrip interdigital filter

Details Quasi-elliptic function microstrip interdigital filter Quasi-elliptic function microstrip interdigital filter

1979-12-27

1981-07-28

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333205, 333246, H01P 1203, H01P 1205, H01P 308

Patent

active

042813026

ABSTRACT:
The Frequency response of a Microstrip Interdigital Filter (MIDF) is improved by providing a specially dimensioned top cover separated from the MIDF ground plane along one or both of its edges by a dielectric layer comprised of thin dielectric sheets. While the upper frequency skirt is mainly determined by the MIDF itself, the bandwidth may be reduced and the slope of the lower frequency skirt may be enhanced by providing the cover in accordance with the invention. The thickness of the dielectric layer can be chosen to further improve the slope of the low frequency skirt by effectively moving the filter zero closer to the desired low frequency cut-off of the filter. The particular choice of the dielectric thickness will not substantially affect the filter bandwidth.

REFERENCES:
patent: 3327255 (1967-06-01), Bolljahn et al.
patent: 3754198 (1973-08-01), Anghel
patent: 4020428 (1977-04-01), Friend et al.

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