ABSTRACT: The first HTS front-end subsystem for wireless base station in China was developed. This demonstration system, which aims
at the application in GSM 1800 mobile communication base station, consists of a single RF path, i.e. one filter and one LNA,
integrated with the pulse tube cooler. The subsystem works at a pass band of 1710–1785 MHz with a gain of 18 dB and at a temperature
of 70 K. The accomplishment of such a demonstration subsystem can boost the development of HTS commercial subsystem.
Science in China Series E Technological Sciences 04/2012; 45(6):638-645. · 1.02 Impact Factor
ABSTRACT: A demonstration sub-system for mobile communications was developed. In this system, a high-temperature superconducting (HTS) microstrip bandpass filter on r-plane sapphire substrate was designed to have a quasi-elliptic function response, which was aimed at covering the whole receive band of DCS 1800 base station, i.e. 1710–1785 MHz. This filter was then integrated with a low noise amplifier (LNA) and a pulse tube cryocooler, forming a demonstration sub-system. Satisfactory performance of this system was achieved.
Superconductor Science and Technology 01/2002; 15(2):276. · 2.66 Impact Factor
ABSTRACT: Two new types of pulse tube refrigerators with optimized cooling
power of 6 W at 77 K have been designed and fabricated. Experiments show
that vibration of the pulse tube refrigerators is at least an order of
magnitude smaller than that of Stirling coolers. Two microwave devices,
a HTS cavity and a HTS miniature lumped band-stop filter, were
integrated with the refrigerators and operated successfully, which
demonstrated the potential application of these integrated devices and
the refrigerator as practical HTS sub-systems
IEEE Transactions on Appiled Superconductivity 07/1999; · 1.04 Impact Factor
ABSTRACT: A cryogenic loop heat pipe (CLHP) has been developed for future aerospace applications at the TIPC (Technical Institute of Physics and Chemistry). The device has been tested in different situations with constant heat sink temperature of about 78 K. The effects of the reservoir volume and the pore size of the primary wick on the performance of CLHP were investigated. With a wick pore size of 2 μm, the CLHP can transfer a heat load of 26 W under horizontal orientation no matter what size of the reservoir volume being used. On the contrary, when the pore size was large (10 μm), the heat transfer capability of the CLHP can be up to 26 W only when a smaller reservoir (60 cc) was used, and its ability to operate against gravity was greatly weakened. Moreover, when the working fluid was oxygen instead of nitrogen, the heat transfer capability can be up to 50 W under horizontal orientation with the other experimental conditions remaining the same.
Cryogenics 47(4):262-266. · 0.67 Impact Factor