Communications: radio wave antennas – Antennas – Active sleeve surrounds feed line
Patent
1981-05-05
1982-11-16
Lieberman, Eli
Communications: radio wave antennas
Antennas
Active sleeve surrounds feed line
343885, 333 12, H01Q 152
Patent
active
043597432
ABSTRACT:
A broadband RF isolator system for connection between RF devices such as inear antennas is disclosed. In accordance with this invention, two or more antennas are spaced several wavelengths apart, connected to coaxial feeds and choked at their adjacent ends to establish the electrical length. In one embodiment of the invention, the isolator is formed by placing a second line adjacent the coaxial line connected to the upper antenna. The addition of this second line forms a balanced transmission line having a given characteristic impedance. The second line is terminated at one end by a resistor having a resistance equal to the value of the characteristic impedance. In a second embodiment the second line is replaced by a coaxial sleeve which is also terminated at one end with a resistor having a resistance value equal to the characteristic impedance. In four additional embodiments, which are essentially variations of the second basic embodiment, coaxial sleeves are also utilized to form the isolation system.
REFERENCES:
patent: 2127088 (1938-08-01), Percival et al.
patent: 2237792 (1941-04-01), Roosenstein
patent: 2750589 (1956-06-01), Harris
patent: 3031668 (1962-04-01), Bryson
patent: 3174118 (1965-03-01), Moore
patent: 3428923 (1969-02-01), Webb
patent: 3961331 (1976-06-01), Campbell
patent: 4161736 (1979-07-01), Goodman
patent: 4217589 (1980-08-01), Stahler
Edelberg Nathan
Kanars Sheldon
Lieberman Eli
Murray Jeremiah G.
The United States of America as represented by the Secretary of
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