Lossy cable choke broadband isolation means for independent ant

Details Lossy cable choke broadband isolation means for independent ant Lossy cable choke broadband isolation means for independent ant

1975-05-21

1976-06-01

Lieberman, Eli

Communications: radio wave antennas

Antennas

Active sleeve surrounds feed line

343885, 343821, H01Q 152

Patent

active

039613313

ABSTRACT:
A broadband isolation section comprised of a plurality of series connected able chokes having respective damping resistors shunted thereacross located between at least two dipole antennas mounted one above the other in a generally vertical plane. The isolator section is particularly adapted to be utilized with dipole antennas having respective pairs of radiating elements substantially aligned in a common vertical axis and being fed from respective radio signal sources by feedlines directed along the common vertical axis through the various radiating elements. The cable chokes included in the isolator section are formed from coaxial cable feedlines and the respective damping resistors shunted thereacross are connected to the sleeve or outer conductor of the feedline(s) feeding the upper antenna(s). Thus adjacent antennas have intermediate broadband isolator sections separating them. Additionally, it is preferable to also include cable chokes at the top and bottom of the particular dipole antenna for determining the electrical length of the respective antennas.

REFERENCES:
patent: 3879735 (1975-04-01), Campbell et al.

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