| 摘要 |
<p>The present invention discloses a radio transmission system. The system uses parallel signal branches formed by output amplifiers (11, 12) and antenna elements (13, 14), wherein the amplification may be adjusted either linearly or by using fixed amplification or by inactivating the desired amplifiers. The intention is to divide the signal into signal branches so that only the summed signal which is observed in the far field of the transmission antennas may be received and detected correctly. Low output powers allow one to use only one amplifier (11) and high output powers, on the other hand, allow one to use a number of parallel amplifiers (11, 12). A control unit (10, 20) adjusts the amplitudes and phases of the signals which are directed to the amplifiers. The antennas may also be formed as one or more antenna groups (21, 22, 30a-d, 31a-d, 40a-b) which may be disposed for example one upon the other or staggeredly so that the radiation patterns generated by the antenna groups are approximately similar to each other.</p> |
