Importance

Loading Importance Indicators...

Abstract

A common transmitting antenna system for a base station in a land mobile communication system like a land mobile telephone system consists of an antenna system with a plurality of input terminals which are so arranged as to avoid mutual radio signal interference, a plurality of transmitter multiplexers comprising a plurality of bandpass filters and a junction box for combining outputs of the bandpass filters, the output terminal of which is connected to one of the input terminals of the antenna system, and a plurality of transmitter groups respectively connected to the output of the bandpass filters. The pass bandwidth of the bandpass filters in the transmitter multiplexers are so selected that when they are arranged in the order of their pass bandwidth, the entire land mobile communication system frequency bandwidth assigned to the base station transmission may be covered by these pass bands. The transmitter groups feature automatic frequency tuning of multiradio channel capable of transmitting entire radio channels in the pass bands of the band pass filters in the transmitter multiplexer. Thus, a land mobile communication system is provided wherein the transmission channels may be instantaneously switched.

Loading the Abstract Image...

First Claim