| 摘要 |
PURPOSE:To improve the flexibility of radio channel arrangement and to facilitate the design of the transmitting antenna system, by composing a transmitting-antenna sharing part of a circulator, junction box and band-pass filters. CONSTITUTION:When one transmitter is equipped, all radio channels are connected to the transmitter, which can be switched, through isolator 504 and connector 505 connected direct from circulator 501, so that transmission bands Tx1-Tx8 can be covered. When two transmitters are equipped, junction box 502, band-pass filters 503, isolators 504, etc., are equipped and each band-pass filter 503 selects one Tx1 among Tx1-Tx8 to determine the center frequency and passing-band width, so that the transmitters can provide transmission of frequency band Tx1. Even if the transmitter connected direct from circulator 501 performs transmission over a radio channel within frequency band Tx1, its signal never arrives the antenna. Transmitters can be extended according to the communication traffic. |
