| 摘要 |
A receiver of a radio system is disclosed, which deteriorates a receiver noise figure of an RF or microwave radio system to increase the coverage of radio signals and includes a band pass filter with sharp skirt feature to attenuate signals of unnecessary frequency bands, thereby remarkably improving characteristics of a reception stage of a base station. The receiver includes an active filter constructed in a manner that a first band pass filter for passing only a predetermined frequency band of an input signal and a low noise amplifier for amplifying signals are integrated with each other, the low noise amplifier including a drop-in type isolator for maintaining impedance matching between band pass filters; a second band pass filter for passing only a predetermined frequency band, the second band pass filter being connected to the back end of the active filter; and an amplifier for amplifying signals, the amplifier being connected to the back end of the second band pass filter.
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