| 摘要 |
The invention relates to an apparatus and a method for simultaneously generating, with the same radio antenna apparatus (10), a number of narrow beams and a wide beam, covering substantially the same area covered by the individual pointed beams together. The radio antenna apparatus (10) comprises an antenna array (3) a Butler matrix (2) connected to the antenna array and a set of amplifying modules (1a, . . . 1h). The activation of each of the inputs (L1, . . . , L8) of the radio antenna apparatus corresponds to a radiation pattern characterized by a narrow beam with a high antenna gain from the antenna array (3). By simultaneously activating the beam ports with the same signal with suitable phase relationships a superimposition of the radiation patterns to which the activated beam port corresponds is achieved in such a way that a wide beam is generated. Since all amplifying modules (1a, . . . , 1h) are used simultaneously, the lower antenna gain of the wide beam will be compensated by a corresponding higher amplification. The wide beam will therefore have substantially the same range as the narrow beams.
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