| 摘要 |
PROBLEM TO BE SOLVED: To reduce the cost of radio relay equipment being arranged in the dead area of a mobile communication system. SOLUTION: The radio relay equipment comprises a downlink receiving antenna 3d principally receiving radio waves of downlink band from the radio base station 2 of a mobile communication system, a downlink band-filter 4d passing the downlink band of received signals selectively, a downlink amplifier 5d for amplifying the passed signals, a downlink transmission antenna 7d for transmitting the radio wave of amplified signal to a mobile station 6, an uplink receiving antenna 7u principally receiving radio waves of uplink band from the mobile station 6, an uplink band-filter 4u passing the uplink band of received signals selectively, an uplink amplifier 5u for amplifying the passed signals, and an uplink transmission antenna 3u for transmitting the radio wave of amplified signal to the radio base station 2. Signals of a partner line are attenuated by utilizing isolation between the antennas. COPYRIGHT: (C)2005,JPO&NCIPI |
