Ground and/or feedline independent resonant feed device for coup

Details Ground and/or feedline independent resonant feed device for coup Ground and/or feedline independent resonant feed device for coup

1978-07-26

1980-08-12

Lieberman, Eli

Communications: radio wave antennas

Antennas

With lumped reactance filter in active antenna

343792, 343885, H01Q 150

Patent

active

042175895

ABSTRACT:
A feed device is tuned to resonance at a selected frequency, to provide essentially infinite impedance between, for example, a system being fed and the power source. The feed device allows passage of feedline currents, which are equal in magnitude and opposite in phase, but prevents passage of any other, unbalanced currents, e.g., common mode currents, antenna radiation currents, etc. This is due to the fact that the infinite impedance of the feed device defines extremely high attenuation to currents other than feedline currents, at the selected frequency. Thus the resonant feed device acts as an isolating circuit for transmitting and receiving antenna systems and the like, since any unbalance in the antenna elements is isolated from the feedlines, and vice versa, whereby the antenna is truly ground and/or feedline independent. When the antenna is located far from a conducting ground two of the resonant devices are required, however only one resonant device is required when the antenna is located in close proximity to a conducting ground.

REFERENCES:
patent: 2158875 (1939-05-01), Leeds
patent: 2297512 (1942-09-01), von Baeyer
patent: 2297513 (1942-09-01), von Baeyer
patent: 2485457 (1949-10-01), Potter
patent: 2594055 (1952-04-01), Miller
patent: 3656167 (1972-04-01), Lea

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