Wave transmission lines and networks – Coupling networks – Wave filters including long line elements
Patent
1981-12-31
1983-11-29
Nussbaum, Marvin L.
Wave transmission lines and networks
Coupling networks
Wave filters including long line elements
333205, 333219, 333246, H01P 1203, H01P 708, H01P 308
Patent
active
044183240
ABSTRACT:
The invention is directed to a interdigital filter comprising a plurality of conductive strips positioned in a row and electromagetically coupled to one another. A conductive transmission line is positioned with respect to the row of conductive strips such that the two ends of the transmission line are capacitively coupled to the ungrounded ends of two nonadjacent conductive strips. This arrangement gives the frequency response of the filter a transmission zero. The frequency of the transmission zero can be adjusted by trimming the ends of the conductive transmission line so as to effect the capacitive coupling between the non-adjacent strips.
REFERENCES:
patent: 3348173 (1967-10-01), Matthaei et al.
patent: 3534301 (1970-10-01), Golembeski
patent: 3539953 (1970-11-01), Jones
patent: 3617954 (1971-11-01), Levy
patent: 4020429 (1977-04-01), Bickley
patent: 4157517 (1979-06-01), Kneisel et al.
patent: 4179673 (1979-12-01), Nishikawa et al.
patent: 4180787 (1979-12-01), Pfitzenmaier
patent: 4266206 (1981-05-01), Bedard et al.
Gillman James W.
Motorola Inc.
Nussbaum Marvin L.
Pennington Joan
Roney Edward M.
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