| 摘要 |
PURPOSE:To eliminate fading in a room and to facilitate a 2-way communication in entire building premises by adopting a parallel line to the end of a coaxial line for premises distribution and coupling with a portable radio equipment terminal through the induced electromagnetic field. CONSTITUTION:A coaxial directional coupler 7 branches a radio signal to a corridor domain D of a building and a parallel line 9 arranged along the ceiling is connected to the branch output side of a directional coupler 8 and the other terminal of the line 9 is connected to a resistive terminator 10 comprising a resistor having a resistance equal to a characteristic impedance of the parallel line 9. Thus, a transmission radio signal from a portable radio terminal 18 of an indoor region A is received by the parallel line 9, becomes an incoming radio signal and given to a head end device 4, where an outgoing radio signal subjected to frequency conversion therein is broadcast to all the premises and the signal is received to an opposite portable radio terminal equipment 19 in an indoor region B through the induced electromagnetic field from a parallel line 15. Thus, the 2-way communication in the entire building premises is facilitated and fading in the room is eliminated.
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