Notch filter network

Details Notch filter network Notch filter network

H - Electricity

03

H

333/16

H03H 7/00 (2006.01) H01P 1/20 (2006.01) H01P 1/213 (2006.01) H01P 7/04 (2006.01)

Patent

CA 1107357

NOTCH FILTER NETWORK ABSTRACT An electrical filter network with improved characteris- tics is disclosed for selectively attenuating and passing two different, closely spaced frequencies. The notch filter network includes a low Q reactive circuit tuned to be parallel resonant at the frequency to be attenuated. A cavity resonator with a high Q is inductively coupled to the reactive circuit and is tuned to be resonant at the frequency to be passed. Utilizing these con- cepts, a multicoupler may be constructed to consist of two or more such filter networks in combination with a transmission line. In such a multicoupler, the network adjacent to the antenna ter- minal is separated therefrom by a multiple of a half wavelength. Additional filter networks are separated from one another by an odd number of a quarter wavelength. With this arrangement, each network passes a band around the frequency to which the high Q cavity is tuned and rejects a band of frequencies around the reactive circuit resonant frequency.

298414

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