Patent ID: 6963758

Claim:
A high sensitive radio receiver system for receiving signals from a plurality of antennae provided in each of a plurality of sectors comprising: a plurality of vacuum chambers; a plurality of cooling units each for cooling respective interiors of the plurality of vacuum chambers; a plurality of high frequency units each provided for a corresponding one of said plurality of antennae; each of said plurality of high frequency units including a series connection of a superconducting bandpass filter for deriving a received high frequency signal in a predetermined frequency band and a first low noise amplifier operable at least at or below a critical temperature of said superconducting bandpass filter for amplifying and delivering the received high frequency signal, said series connection constituting a first signal path and contained in one of the vacuum chambers; a second signal path that bypasses said first signal path, an output selection circuit configured to provide the received high frequency signal from corresponding one of said plurality of antennae selectively to one of said first and second signal paths, wherein said selection circuit is adapted such that when the temperature of said superconducting bandpass filter is higher than the critical temperature, an impedance of said superconducting bandpass filter mismatches that of said output selection circuit to inhibit transmission of the received high frequency signal to said first low noise amplifier and to supply said received high frequency signal to said second signal path and when the temperature of said superconducting bandpass filter is below the critical temperature, the impedance of said superconducting bandpass filter substantially matches that of said output selection circuit to allow transmission of the received high frequency signal from said output selection circuit to said first low noise power amplifier, and at least two antennae of each sector are connected to the output selection circuits of different one of said plurality of high frequency units.