Communications: radio wave antennas – Antennas – Active sleeve surrounds feed line
Patent
1995-04-07
1997-04-15
Hajec, Donald T.
Communications: radio wave antennas
Antennas
Active sleeve surrounds feed line
343790, 343872, H01Q 904
Patent
active
056214200
ABSTRACT:
A monopole antenna for aircraft, vehicles, marine vessels and the like comprises a coaxial cable radiator and a metal tube radiator surrounding the lower half of the coaxial cable. The center conductor of a coaxial cable connector applies radiant energy to the jacket of the coaxial radiator. The center conductor of the coaxial radiator extends from the bottom of the cable and is connected to the outer lower surface of the metal tube radiator. In operation, the distributed L-C and R-C values at resonance couple radiation energy to the metal tube radiator while the tube suppresses radiation from the jacket except for radiation from the upper portion thereof. Tests comparing the radiation pattern of the above antenna without ground plane and a conventional monopole antenna with ground plane indicate that the radiation pattern is extended in the forward, axial (zero degree) direction although some loss occurs in the + and -90 degree direction. This range extension is beneficial for directed communications and other applications. Other advantages resulting from the present invention are also disclosed including being functional when installed in a non-conventional manner.
REFERENCES:
patent: 4725846 (1988-02-01), Hendershot
patent: 5105199 (1992-04-01), Ukmar
patent: 5231412 (1993-07-01), Eberhardt et al.
patent: 5311201 (1994-05-01), Lillie et al.
patent: 5317327 (1994-05-01), Piole
Comant Industries, Inc.
Dreyfus Edward
Hajec Donald T.
Ho Tan
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