Electronic theft detection apparatus with responder elements on

Details Electronic theft detection apparatus with responder elements on Electronic theft detection apparatus with responder elements on

1984-03-16

1987-02-10

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

G08B 1324

Patent

active

046426132

ABSTRACT:
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.

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