Patent ID: 7941187

Claim:
A wireless communication base station sharing apparatus for sharing one antenna between a main base station system including a transceiver and a sub base station system including a transceiver using a frequency band different from another frequency band used in the main base station system, comprising: a first signal combiner/distributor connected to a transmission/reception signal line of a main base station system, through a first port, for distributing a signal received through the first port to second and third ports, and combining signals received through the second and third ports according to the phases of the signals and outputting the combined signal through the first port or a fourth port; a second signal combiner/distributor connected to a transmission/reception signal line of a sub base station system duplexer through a fifth port and connected to the antenna through an eighth port, for distributing a signal received through the fifth port to sixth and seventh ports, and combining signals received through the sixth and seventh ports according to the phases of the signals and outputting the combined signal through the fifth port or eighth port; a first variable filter provided in a signal path between the second port of the first signal combiner/distributor and the sixth port of the second signal combiner/distributor, for filtering a predetermined frequency band and variably shifting a filtering band according to an external control signal; and a second variable filter provided in a signal path between the third port of the first signal combiner/distributor and the seventh port of the second signal combiner/distributor, for filtering a predetermined frequency band and variably shifting a filtering band according to an external control signal, wherein the first and second signal combiners/distributors are hybrid couplers and the first and second variable filters are band-pass filters for passing the transmission and reception frequency bands of the main base station system, further comprising a distributor for distributing a signal received from a receiver of the sub base station system duplexer, and a reception filter for filtering a distributed signal received from the distributor and providing the filtered signal to the fourth port of the first signal combiner/distributor.