| 摘要 |
<p>There is disclosed an apparatus for emitting and receiving radio-frequency signals, the apparatus comprising a circuit to cancel interferences. It comprises means for transmitting at least one signal by virtue of an antenna, means for receiving signals by the same antenna and means for isolating the means for transmitting from the means for receiving. The apparatus comprises also:
- means for tapping a first part of the signal to be transmitted;
- means for controlling the amplitude and the phase of the first part of the signal;
- means for introducing the first part of the signal in the means for receiving after said first part of the signal has been amplified and phase-shifted, such as to cancel in the means for receiving interferences due to portions of the signal that unwantedly have entered the means for receiving.</p> |
