RF notch filter having multiple notch and variable notch frequen

Details RF notch filter having multiple notch and variable notch frequen RF notch filter having multiple notch and variable notch frequen

1998-06-05

2000-02-01

Le, Dinh T.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327552, H03K 500

Patent

active

060207833

ABSTRACT:
A filter network having the capability of establishing multiple, tunable notch frequencies. A notch filter path is established for each notch frequency and includes a bandpass filter and inverter. An input RF signal covering a wide frequency range is applied to all the notch filter paths. Each notch filter path produces an output spectrum that is equal in magnitude and 180.degree. out of phase with respect to an undesired frequency spectrum. A combiner circuit combines the outputs of each notch filter path in parallel with the RF input signal to produce an RF output signal with all desired spectra unchanged and all undesired spectra attenuated.

REFERENCES:
patent: 3659212 (1972-04-01), Saliga
patent: 4088834 (1978-05-01), Thurmond
patent: 4602337 (1986-07-01), Cox
patent: 4662001 (1987-04-01), Cruz et al.
patent: 5054117 (1991-10-01), Cruz et al.
patent: 5337056 (1994-08-01), Dax

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