Communications: radio wave antennas – Antennas – With aircraft
Patent
1983-09-30
1985-12-03
Lieberman, Eli
Communications: radio wave antennas
Antennas
With aircraft
343756, 343790, 343898, H01Q 130, H01Q 1524
Patent
active
045568898
ABSTRACT:
An antenna, suitable for being deployed from an aircraft or other vehicle and characterized by broadband, omnidirectional radiation/reception is provided by a coaxial transmission feed line that is terminated by an electrically conductive ball that is electrically and mechanically connected to an extension of the center conductor of the coaxial line, and by a telescopically adjustable sleeve choke having the end adjacent the ball conductor, electrically bonded to the outer conductor of the coaxial line. The choke is adjusted in length to form a matched counterpoise to the ball radiator. The diameter of the ball, the gap length corresponding to the length of the inner conductor between the ball and the terminus of the outer conductor of the line, as well as the length of the sleeve choke, are selected so that the diameter of the ball is greater than one-quarter of the midband wavelength and less than five eighths of the midband wavelength, the gap length between the ball radiator and the terminus of the outer coaxial conductor is less than one-eighth of the midband wavelength, and the choke length is approximately equal to the midband wavelength.
REFERENCES:
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patent: 4185289 (1980-01-01), DeSantis et al.
patent: 4278955 (1981-07-01), Lunden
patent: 4387377 (1983-06-01), Kandler
Lieberman Eli
The Boeing Company
Wimer Michael C.
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