Tunable microwave filter apparatus having a notch resonator

Details Tunable microwave filter apparatus having a notch resonator Tunable microwave filter apparatus having a notch resonator

1994-04-13

1995-04-11

Ham, Seungsook

Wave transmission lines and networks

Coupling networks

Wave filters including long line elements

333235, H01P 1205

Patent

active

054062349

ABSTRACT:
There is disclosed a tunable notch filter which has a bandpass characteristic and where a tunable notch is added to the bandpass filter by placing a resonator outside the input or output probe of the bandpass filter. The bandpass filter is a resonant type of filter and comprises a plurality of parallel, spaced apart resonators. The tunable notch resonator is positioned near the input or output probe and operates to direct a substantial amount of energy from the filter at the frequency at which the notch resonator is tuned. In this manner a notch is created within the bandpass characteristic of the filter and which notch resonator can be tuned to provide the notch anywhere in the filter passband or above or below the band edges.

REFERENCES:
patent: 3889214 (1975-06-01), Petitjean et al.
patent: 4596969 (1986-06-01), Jachowski
patent: 4721931 (1988-01-01), Nishikawa et al.
Davis, "Microwave Semiconductor Circuit Design", Van Nostrand Reinhold Company, Inc., pp. 50-93.

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