G - Physics – 08 – B
Patent
G - Physics
08
B
340/124.3
G08B 13/24 (2006.01)
Patent
CA 1234418
- 32 - ABSTRACT OF THE DISCLOSURE A self contained electronic theft detection apparatus comprising a housing (30) from which a rigid tubular transmitter antenna loop (32) extends; and a wire loop receiver antenna (56) extends inside the transmitter antenna loop. The transmitter antenna (32) is provided with a capacitor (C54) with which it resonates at the frequency of responder elements to be detected and the transmitter antenna is supplied with sharp voltage pulses from a pulse forming circuit (66) and a power amplifier (68) which cause the antenna to resonate in a rapidly decaying manner.
474200
Goudreau Gage Dubuc
Knogo Corporation
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