Abstract
This paper presents an experimental cryogenic receiver front-end (CRFE) with sharp skirtcharacteristics for mobile base stations. The CRFE comprises a high-temperaturesuperconducting filter, a cryogenic low-noise amplifier, and a highly reliable cryostat that isvery compact. The major characteristics of the proposed CRFE measured at 70 K area centre frequency of 1.95 GHz, passband width of 20 MHz, sharp selectivity of20 dB/100 kHz, 1.4 dB ripple, 31.3 dB average passband gain, and average passband equivalent noisetemperature of 47.9 K. The CRFE weighs 19 kg and occupies 35 l. Random failure of thecryostat is also evaluated by a continuous operation test using four identical onessimultaneously. The cryostat used in the CRFE has a high reliability level of over five yearsof continuous maintenance-free operation.
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