Patent ID: 6104934
Filing Date: 2000-08-15
Classification: F25B,H04B

Abstract:
In a mobile radio system in which a base station range is typically limited by the sensitivity of a base station receiver, a base station having at least one antenna and receiver front end and a plurality of sectors, the receiver front end comprising;a plurality of planar filters for spectrally filtering a plurality of RF signals to form a plurality of filtered RF signals corresponding to the plurality of sectors;a plurality of amplifiers, in communication with the plurality of planer filters, for amplifying the plurality of filtered RF signals; anda cooler for cryogenically cooling the plurality of planar filters and the plurality of amplifiers, wherein at least one of the plurality of planar filters and plurality of amplifiers comprises a superconducting material, the cooler including at least one cryostat containing the plurality of planar filters and the plurality of amplifiers, the at least one cryostat being mounted on the antenna, and at least one cold finger engaging simultaneously the plurality of planar filters and the plurality of amplifiers and having a variable cooling capacity and being substantially adjacent to the antenna to reduce the insertion loss along a conductor extending between the antenna and the plurality of planar filters to a selected level, wherein the plurality of planar filters and the plurality of amplifiers are located in a common evacuated chamber of the cooler.