| 摘要 |
The present invention provides a distributed antenna system comprising a primary antenna (14A, 16A) and a plurality of secondary antennas (36, 40), a [fibre] fiber optic network (20, 22) connected between the primary antenna (14A, 16A) and the secondary antennas (36, 40), first means ([16] 24, 44) associated with a first one of the antennas (16A, 40) which transmits signals received by that antenna (16A, 40) into the [fibre] fiber optic network (20, 22), and second means (32, 50) associated with a second one of the antennas (14A, 36) which causes that antenna (14A, 36) to transmit signals received by the second means (32, 50) from the [fibre] fiber optic network (20, 22). Preferably, the use of a heterodyne circuit is avoided and the light signals travelling within the [fibre] fiber optic networks (20, 22) are modulated at radio frequency.
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