Patent ID: 7911986

Claim:
An apparatus for measuring bi-directional radio channel in a time division duplex (TDD), comprising: a transmitting means for amplifying a signal that is frequency-up converted to radio frequency and removing a signal of other frequency band; a high power multiplexing switching means for sequentially transferring transmitting signals from the transmitting means to a corresponding circulator; a plurality of circulators for transferring the transmitting signals from the high power multiplexing switching means to a corresponding antenna among multiple antennas, and transferring a receiving signal from a corresponding antenna; a low loss multiplexing switching means for receiving the receiving signal from the corresponding circulator, and sequentially transferring the receiving signal; and a receiving means for receiving the receiving signal from the low loss multiplexing switching means, removing undesired frequency components from the receiving signal except a desired frequency band and low-noise amplifying the desired frequency band of the receiving signal.