Communications: radio wave antennas – Antennas – Active sleeve surrounds feed line
Patent
1975-03-12
1976-04-13
Lieberman, Eli
Communications: radio wave antennas
Antennas
Active sleeve surrounds feed line
343850, 343900, H01Q 930
Patent
active
039507572
ABSTRACT:
A whip antenna with a substantially constant impedance over a broad band of radio frequencies includes a mounting section, a high-power-dissipation low-resistance assembly, a first whip section, a second whip section, and a high-impedance quarter-wavelength transformer section concentrically formed around the first whip section and extending from the resistance assembly to the junction of the first and second whip sections. The low-resistance termination is attached close to the base of the antenna and is transformed to a high resistance at the junction of the first and second whip sections at the frequency where the matching section length equals one quarter-wavelength. The resistive power loss only occurs over a limited band centered at the design frequency of the matching section. Instability caused by emplacement of a high-mass resistive termination towards the top of the complete antenna is thus avoided.
REFERENCES:
patent: 2454774 (1948-11-01), Chesus et al.
patent: 3208069 (1965-09-01), Brueckmann
Beam Systems Israel Ltd.
Lieberman Eli
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