| 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 directly coupled to said amplifier ( 6 ), and at least an electronic powering circuit, whereof the output is connected to the amplifier.
|
