Adjustable passband filter

Details Adjustable passband filter Adjustable passband filter

1979-05-01

1981-02-10

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333204, H01P 120, H01P 308

Patent

active

042504759

ABSTRACT:
An adjustable passband filter comprises at least one reentrant section in shunt with a transmission line, which section can be electronically switched between different conditions. The reentrant section, when in at least one condition acts, to reduce the band of frequencies passed by the transmission line by increasing the effective capacitance of the filter and when in another condition, operates as an open circuit, whereby the filter exhibits a broader passband.

REFERENCES:
patent: 3414833 (1968-12-01), Tolliver
patent: 3417351 (1968-12-01), DiPiazza
patent: 3605045 (1971-09-01), Ramsbotham

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