Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1988-06-27
1990-12-04
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343713, 343872, 343897, H01Q 928
Patent
active
049757130
ABSTRACT:
A panel shaped mesh-type structure is provided as one of the conductive or radiating members of a radio frequency mobile antenna fed by a coaxial cable. The mesh-type structure appears to decouple antenna currents in the coaxial cable at short distances, while maintaining performance as a transmitter at long distances. The radiating elements are surrounded by an insulating material which serves as a dielectric, further improving antenna performance and also serving as environmental protection. The radiating elements are made from readily available mesh and sheet stock materials aligned in a generally planar configuration attached to a either the shield or center lead of the coaxial cable. A small section of the central cable conductor is stripped of insulation and shielding, to serve as a miniature loading coil for the first plate-type conductive element. Shielding of the coaxial cable is attached directly to a mesh-type element serving as the counterpoise. The specific geometries tested produce antenna performance generally insensitive to dielectric variations of as much as 25%.
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"Micro-Strip Antenna's", Second Edition, 1982, p. 27, by Bahl and Bhartia.
Charmasson Henri J. A.
Modublox & Co., Inc.
Wimer Michael C.
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