Communications: radio wave antennas – Antennas – With vehicle
Patent
1995-06-30
1996-10-22
Wimer, Michael C.
Communications: radio wave antennas
Antennas
With vehicle
343729, 343752, H01Q 132
Patent
active
055681573
ABSTRACT:
A low profile, dual purpose antenna for simultaneous UHF and LF use has two coplanar antenna elements, one of which is circular and the other of which is a concentric annulus separated from it by a dielectric, as well as a third, linear antenna element extending from the center of the circular element. The circular element serves both to assist in tuning the UHF section of the antenna and as a voltage probe for the electrostatic component of the LF signal. Integrated within the antenna housing is a high input impedance, low noise amplifier for bandwidth limiting the LF signals. A coaxial feeder cable serves to connect both UHF and LF sections of the antenna to external equipment. Entry for the coaxial feeder cable into the antenna housing is through a threaded collar, which also acts as a single point fixing of the antenna to the roof of a vehicle.
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"40th IEEE Vehicular Technology Conference", May 1990, Orland, Florida (pp. 19-23).
Garg et al., A Microstrip Array of Concentric Annular Rings, Jun. 1985, pp. 655-659.
Phan Tho
Securicor Datatrak Limited
Wimer Michael C.
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