Communications: radio wave antennas – Antennas – Spiral or helical type
Patent
1983-09-02
1985-11-19
Lieberman, Eli
Communications: radio wave antennas
Antennas
Spiral or helical type
H01Q 136
Patent
active
045545545
ABSTRACT:
An antenna is tuned in separate discrete frequency bands by changing the ctrical length of the antenna. PIN diodes are placed at predetermined locations on the antenna coaxial cable radiating elements. When it is desired to shorten the antenna for a higher frequency band use, the diodes are biased short circuiting segments of the antenna. When the lower frequency band use is desired, diodes are unbiased so that the diodes act like a very small capacitance shunted by a large resistance which is essentially an open circuit permitting the entire length of the antenna to operate.
REFERENCES:
patent: 3949407 (1976-04-01), Jagdmann et al.
Gropelli, Jr. John J.
Olesen Ralph C.
Sainati Robert A.
Stanland Andrew J.
Beers Robert F.
Lall Prithvi C.
Lieberman Eli
McGill Arthur A.
The United States of America as represented by the Secretary of
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