Folded interdigital notch filter

Details Folded interdigital notch filter Folded interdigital notch filter

1991-05-20

1992-10-06

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333209, H01P 1205

Patent

active

051535416

ABSTRACT:
An interdigital resonant cavity filter structure is foled to provide two adjacent chambers physically positioned side by side and electrically connected in series with each other. A center plate divides the two chambers with a slot at one end of the structure to permit the two chambers to function as one resonant cavity in a folded relation to each other. Each chamber includes interdigital resonators which are related to the overall resonant cavity to produce a band pass filter action within the folded resonant cavity. The input of the filter structure is applied through a port of a circulator connected to one end of the resonant cavity and the output is taken from another port of the circulator. The opposite end of the resonant cavity is terminated in the characteristic impedance of the resonant cavity thereby causing the overall structure to operate as a high quality notch filter.

REFERENCES:
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patent: 3737816 (1973-06-01), Honicke
patent: 3818389 (1974-06-01), Fisher
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patent: 5008956 (1991-04-01), Hemmie
patent: 5023579 (1991-06-01), Bentivenga et al.
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"Linear Phase Decimation and Interpolation Filters for High-Speed Applications" by E. DeMan and U. Kleine, Electronic Letters, Jun. 9, 1988, vol. 24, No. 12, pp. 757-759.
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