High-temperature Superconducting Receiver Front-end Subsystem

With the development of the modern communication, new challeges and requirements are put forword for normal receiver, that is the reason there coming the high temperature superconductor (HTSC) receiver.HTSC reciever can solve a series of problems existing in mobile communication, increase the capacity of base station in mobile communication, expand the coverage rate of base station, improve the conversation quality, reduce the rate of offline, reduce the radiation of mobile phone.In this paper, some basic property of HTSC and recent development of HTSC technology is first introduced, and the principle of component for the frond-end subsystem of HTSC receiver is given.This subsystem is composed of the HTSC filter and the cryogenic low noise amplifier and the cooler.Then, the components of th subsystem are designed and manufactured at UHF frequence.Finally, the test result and analyse is shown.In the design of HTSC filter, IE3D is used, which is a full-wave solver. In order to meet the demand for smaller capacity and high rejection in upper-sidebands, the Tri-section step impedance resonator (SIR) and the zigzag line structures have been used as the construction of the resonator in the filter. With the collaboration of ADS (Advanced design system), this paper has designed and manufactured a cryogenic LNA (Low noise amplifier) working at UHF frequence.In order to work stably at low temperature, HEMT and feedback technology for the amplifier is used.In the whole design,the simulation softwares improve the efficiency and the veracity.The front-end sub-system is tested in the temperature of 77K by the cooler,the result of testing basically fulfilled the requirement.