Band stop filter and circuit arrangement for common antenna

Details Band stop filter and circuit arrangement for common antenna Band stop filter and circuit arrangement for common antenna

1980-12-01

1983-05-03

Nussbaum, Marvin L.

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333206, H01P 1213, H03H 746, H03H 701

Patent

active

043822380

ABSTRACT:
In a band stop filter having a plurality of series resonating circuits, and coaxial cables connected between the series resonating circuits, the length of each of the coaxial cables is made either shorter or longer than quarter wavelength at the center frequency. With this arrangement, asymmetry is introduced in the insertion loss vs frequency characteristic curve so that the curve is sharper than the symmetrical curve in a given range, resulting in a reduction of insertion loss at a transmission band which resides either above or below the center frequency. Two band stop filters may be combined to constitute an antenna coupler for connecting a transmitter and a receiver to a common antenna. Each of the series resonating circuits used in the band stop filter may be constructed of a quarter wavelength coaxial resonator, which functions as a parallel resonating circuit, and a loop-like coaxial cable, which functions as a coupling capacitor.

REFERENCES:
patent: 3293644 (1966-12-01), Loos et al.
patent: 3733608 (1973-05-01), McGhay et al.
patent: 4288766 (1981-09-01), Okita
Matthaei et al.--"Microwave Filters, Impedance-Matching Networks, and Coupling Structures", McGraw Hill, New York, 1964; pp. 216, 759-764, and title page.

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