| 摘要 |
PURPOSE: Single frequency bi-directional repeater equipment is provided to obtain high transmission/reception separation by using a variable precision resistance between transmission/reception ports. CONSTITUTION: The first band pass filter(110) passes only a transmission/reception signal of pre-set band. The first power distributor(120) outputs the transmission signal output from the first band pass filter(110) only to a transmission port(121) and transmits a signal received by a receiving port(122) to the first band pass filter(110) as a reception signal. The first variable precision resistance(130) is inserted between the transmission and reception ports(121,122) of the first power distributor(120) and separates a transmission signal and a reception signal. A bias circuit(140) provides a bias voltage corresponding to a level of the transmission signal. A high gain amplifier(150) amplifies the transmission signal output from the first power distributor(120) as much as a gain provided from the bias circuit(140). The second band pass filter(160) transmits only a transmission/reception signal of a pre-set band. The second power distributor(170) outputs a reception signal obtained from the second band pass filter(160) to an output port(171) and outputs a transmission signal inputted to an input port(171) to the second band pass filter(160). The second variable precision resistance(180) is inserted between the input/output ports(172,171) of the second power distributor(170) and separates the transmission signal and the reception signal. The third band pass filter(190) filters the reception signal output from the output port(171) with a pre-set band and transmits it to the first power distributor(120).
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