Reflection mode notch filter

Details Reflection mode notch filter Reflection mode notch filter

Filed on

1978-11-01

Date issued

1980-06-10

Examiner

LaRoche, Eugene R.

Patent Class

Wave transmission lines and networks

SubClass

Coupling networks

SubSubClass

Wave filters including long line elements

Other Related Categories

328167, 333202, H01P 120, H03H 714

Type

Patent

Status

active

Patent number

042075475

Description

ABSTRACT:
A two stage transmission notch filter characteristic is achieved with one stage of microwave circuitry. Elimination of the second stage is accomplished by reflecting the microwave power back through a single stage device. Structurally, the adjacent ports of two 3 dB directional couplers are directly connected by delay lines of unequal delay times. The opposite adjacent ports of one coupler comprise the device input and output while the opposite adjacent ports of the other coupler are terminated in a manner that reflects microwave power back through the device. A phase shifter is inserted into one delay line for tuning and a non-reciprocal phase element is used to prevent reflected signals from emerging from the input port.

REFERENCES:
patent: 3423699 (1969-01-01), Hines
patent: 3538460 (1970-11-01), Putz
patent: 3660783 (1972-05-01), Cappucci
patent: 3895304 (1975-07-01), Klein
patent: 3967220 (1976-06-01), Tagashira et al.

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