| 摘要 |
The invention concerns electromagnetic detection systems designed to detect stolen objects, and comprising at least a transmission antenna and at least a reception antenna, the or each transmission antenna being powered by a power amplifier. The device consists of: at least a transmission antenna ( 4 ) proper, not frequency-tuned, at least an on/off simplified power amplifier ( 6 ) of H-bridge or half-bridge or quarter-bridge type, the transmission antenna element ( 4 ) being directly coupled to said amplifier ( 6 ), and at least an electronic powering circuit, whereof the output is connected to the amplifier.
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