A high temperature superconducting (HTS) contiguous-band diplexer was designed and fabricated. The HTS contiguous-band diplexer was made using 2-inch-diameter LaA1O3 wafers coated with epi-taxial thin film YBO on both...A high temperature superconducting (HTS) contiguous-band diplexer was designed and fabricated. The HTS contiguous-band diplexer was made using 2-inch-diameter LaA1O3 wafers coated with epi-taxial thin film YBO on both sides, and was made up of two 4-pole singly-terminated low-pass prototype bandpass channel filters connected in parallel. Its operation frequency was centered at 3.25GHz and 3.75GHz with 500-MHz-wide channels. The HTS diplexer operated at 77 K shows excellent performance. The insertion loss in the pass-band is less than 0.8 dB and the rejection between per channel is greater than 30dB. In comparison with the conventional diplexer, the HTS diplexer offers more than 2dB improvement in insertion loss performance and 3/4 volume reduction. This design concept can be applied to the design of HTS multiplexer and the future HTS ESM channeliser systems.展开更多
The strong electric and magnetic coupled novel HTSC (high temperature superconductor) open-loop microstrip resonators are studied in this report and the traditional structure of open-loop resonators is improved. A min...The strong electric and magnetic coupled novel HTSC (high temperature superconductor) open-loop microstrip resonators are studied in this report and the traditional structure of open-loop resonators is improved. A miniature wide-band HTSC bandpass filter is developed by the novel structure, which is fabricated on YBCO/LaAlO3/YBCO substrate with dimensions of 14.8×9.6 mm2. This filter is tested at 77 K, and the specifications are that the center frequency is 2230 MHz, the bandwidth is 455 MHz, and the best insertion loss is 0.14 dB in passband.展开更多
A novel method for microwave surface resistance measurement of high temperature superconductor thin film at multi-frequency by multimode of sapphire rod is introduced. This method has the advantages of high sensitivit...A novel method for microwave surface resistance measurement of high temperature superconductor thin film at multi-frequency by multimode of sapphire rod is introduced. This method has the advantages of high sensitivity and large dynamic range of the measurement. By using this method, the frequency dependent microwave surface resistance of a single piece of high temperature superconductor thin film can be characterized within one temperature cycle. This method is capable of reducing the amount of work in surface resistance measurement and providing supports to the research and the industrialization of high temperature superconductor thin film.展开更多
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 devi...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.展开更多
文摘A high temperature superconducting (HTS) contiguous-band diplexer was designed and fabricated. The HTS contiguous-band diplexer was made using 2-inch-diameter LaA1O3 wafers coated with epi-taxial thin film YBO on both sides, and was made up of two 4-pole singly-terminated low-pass prototype bandpass channel filters connected in parallel. Its operation frequency was centered at 3.25GHz and 3.75GHz with 500-MHz-wide channels. The HTS diplexer operated at 77 K shows excellent performance. The insertion loss in the pass-band is less than 0.8 dB and the rejection between per channel is greater than 30dB. In comparison with the conventional diplexer, the HTS diplexer offers more than 2dB improvement in insertion loss performance and 3/4 volume reduction. This design concept can be applied to the design of HTS multiplexer and the future HTS ESM channeliser systems.
基金Supported by the High-Tech Research Project (863 Project) of the Ministry of Sci-ence and Technology of China (Grant No. 2002AA306421)the Youth Project of UESTC (Grant No. JX0649)
文摘The strong electric and magnetic coupled novel HTSC (high temperature superconductor) open-loop microstrip resonators are studied in this report and the traditional structure of open-loop resonators is improved. A miniature wide-band HTSC bandpass filter is developed by the novel structure, which is fabricated on YBCO/LaAlO3/YBCO substrate with dimensions of 14.8×9.6 mm2. This filter is tested at 77 K, and the specifications are that the center frequency is 2230 MHz, the bandwidth is 455 MHz, and the best insertion loss is 0.14 dB in passband.
文摘A novel method for microwave surface resistance measurement of high temperature superconductor thin film at multi-frequency by multimode of sapphire rod is introduced. This method has the advantages of high sensitivity and large dynamic range of the measurement. By using this method, the frequency dependent microwave surface resistance of a single piece of high temperature superconductor thin film can be characterized within one temperature cycle. This method is capable of reducing the amount of work in surface resistance measurement and providing supports to the research and the industrialization of high temperature superconductor thin film.
基金supported by the National High-Tech Research and Development Program of China (Grant No. 2007AA03Z212)
文摘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.
