Electrically tunable band pass filter with symmetrical low-side

Details Electrically tunable band pass filter with symmetrical low-side Electrically tunable band pass filter with symmetrical low-side

1999-02-01

2000-08-01

Bettendorf, Justin P.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333175, 455340, H03H 701

Patent

active

060972696

ABSTRACT:
A tunable filter (400) provides dual injection mode operation over a continuously tunable frequency range (500). A combination of mirrored series resonant circuits (432, 446) tuned through varactors (434, 448) allows the frequency response to shift. The use of a series capacitor and shunted inductor (430, 428), (444, 442) mirrored onto each series resonator (432, 446) provides both high-side and low-side injection protection.

REFERENCES:
patent: 3042885 (1962-07-01), Myers
patent: 4956710 (1990-09-01), Pugel
patent: 5392011 (1995-02-01), Li

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