| 摘要 |
The invention discloses an antenna device ( 500, 600, 700 ) for a radio base station in a cellular telephony system, which comprises a first and a second input connection for a first (D 1 ) and a second (D 2 ) data stream, and a first ( 510, 610, 710 ) and a second ( 511, 611, 711 ) polarization former, one for each of said data streams. The device also comprises a first ( 530, 630, 730 ) and a second ( 532, 632, 732 ) antenna of respective first and second polarizations, and one amplifier each. The device also comprises a first ( 515, 615, 715 ) and a second ( 516, 616, 716 ) combiner, so that the outputs from the polarization formers may be combined as input to each of the first and second antennas.
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