Multi-frequency antenna employing tuned sleeve chokes

Details Multi-frequency antenna employing tuned sleeve chokes Multi-frequency antenna employing tuned sleeve chokes

1982-11-24

1985-04-02

Lieberman, Eli

Communications: radio wave antennas

Antennas

Active sleeve surrounds feed line

343792, H01Q 940

Patent

active

045090564

ABSTRACT:
The invention comprises an antenna capable of effective operation at a number of different frequencies, not necessarily harmonically related, that may be separated in frequency by as little as twenty-five percent. The elements of the antenna are decoupled by loaded coaxial chokes that form part of the active portion of the antenna at the resonant frequency of the chokes. The chokes are loaded with a solid dielectric insert dimensioned so that the inner surface of the shell of the choke and the outer surface of the conductor extending through the choke form a quarter wave shorted transmission line to produce an infinite impedance at the open end of the choke. The chokes may be arranged in series, parallel or series-parallel configurations.

REFERENCES:
patent: 2218741 (1940-10-01), Buschbeck
patent: 2487567 (1949-11-01), Lindenblad
patent: 2533078 (1950-12-01), Woodward
patent: 2535298 (1950-12-01), Lattin
patent: 2648768 (1953-08-01), Woodward
patent: 3293646 (1966-12-01), Brueckmann
patent: 3588903 (1971-06-01), Hampton

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