H - Electricity – 01 – Q
Patent
H - Electricity
01
Q
H01Q 5/00 (2006.01) H01Q 1/32 (2006.01) H01Q 9/04 (2006.01) H01Q 9/36 (2006.01)
Patent
CA 2114576
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 centre of the circular element. The circular element serves both to assist in tuninq 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.
Mccarthy Tetrault Llp
Securicor Datatrak Limited
LandOfFree
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