Investigation of HTSC digital trunking communication receiver subsystem

Abstract

The application of HTSC (high temperature superconductor) microwave devices in a UHF digital trunking communication system is introduced. The replacement between the HTSC microwave devices and the normal microwave devices is conducted. The digital sensitivity of the base station in complex electromagnetic environment has been increased to 6 dB, as the results of the experiment indicated, and this means that the coverage radius of the base station has been improved about twice, that is to say, the coverage area can be extended to four times as large as that of the current method. high temperature superconductor (HTSC), receiver, digital trunking communication system Citation: Yang K, Lai J M, Bu S R, et al. Investigation of HTSC digital trunking communication receiver subsystem.The high temperature superconductor (HTSC) microwave filters and multiplexers are very important devices in the radio frequency (RF) and microwave subsystems, and have more advantages in lower loss, higher selectivity, lighter weight, and easier to integrate with other microwave solid circuits than normal ones. Nowadays, the application of the HTSC microwave devices in mobile communication and satellite communication has aroused much concern for this reason. Both at home and abroad [1-3], many technologies have been developed for the design and fabrication, especially for the miniaturization of filters [3,4]. In this paper, very low noise figure (NF) is gained, due to a HTSC filter with low loss and high selectivity and a low noise amplifier (LNA) working in the liquid nitrogen temperature environment. In this design, the HTSC filter is laid in the front of the LNA to improve the anti-jamming capability of the receiver.The sensitivity of the digital trunking communication system not only depends on the RF front-end circuit, but also directly depends on the digital sensitivity. It is very necessary to lay the filter in the front of the receiver because there are very serious interferences in UHF band. The advantage of the HTSC technology is presented obviously.

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