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
On YBCO/LaAlO3/YBCO substrate with the dimension of 10 mm 20 mm, a miniature HTSC (high tem- perature superconductivity) bandpass filter with multi-zig- zag line structure is developed. At 77 K, the center frequency i...On YBCO/LaAlO3/YBCO substrate with the dimension of 10 mm 20 mm, a miniature HTSC (high tem- perature superconductivity) bandpass filter with multi-zig- zag line structure is developed. At 77 K, the center frequency is 1.2 GHz, the bandwidth is 50 MHz, and the insertion loss is 0.12 dB.展开更多
1 Introduction It is very important for practical application of HTSC to increase the critical cur-rent density （J<sub>c</sub>）by artificially introducing pinning centers to enhance flux pinning.Ex-perim...1 Introduction It is very important for practical application of HTSC to increase the critical cur-rent density （J<sub>c</sub>）by artificially introducing pinning centers to enhance flux pinning.Ex-periment results show that neutron radiation is 1000 times more effective than theelectron and proton radiation.So in recent years,the neutron radiation has becomepopular,theoretically and practically.After irradiation of fast neutrons in high flux,the magnetization ratio of polycrystal samples of Y and Bi Systems are M<sub>irr</sub>/M<sub>unirr</sub>≈2.8—3.1.But T<sub>c</sub> is descending with the neutron flux increasing and the decreasingratio is about（2.6—3.0 K）/(10<sup>18</sup> n/cm<sup>2</sup>).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
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.
基金This work was supported by the“863”Project(Grant No.863-CD060201)the National Superconductor Institute.
文摘On YBCO/LaAlO3/YBCO substrate with the dimension of 10 mm 20 mm, a miniature HTSC (high tem- perature superconductivity) bandpass filter with multi-zig- zag line structure is developed. At 77 K, the center frequency is 1.2 GHz, the bandwidth is 50 MHz, and the insertion loss is 0.12 dB.
基金National Centre for ResearchDevelopment of SuperconductivityFoundation for Doctoral Education of China.
文摘1 Introduction It is very important for practical application of HTSC to increase the critical cur-rent density （J<sub>c</sub>）by artificially introducing pinning centers to enhance flux pinning.Ex-periment results show that neutron radiation is 1000 times more effective than theelectron and proton radiation.So in recent years,the neutron radiation has becomepopular,theoretically and practically.After irradiation of fast neutrons in high flux,the magnetization ratio of polycrystal samples of Y and Bi Systems are M<sub>irr</sub>/M<sub>unirr</sub>≈2.8—3.1.But T<sub>c</sub> is descending with the neutron flux increasing and the decreasingratio is about（2.6—3.0 K）/(10<sup>18</sup> n/cm<sup>2</sup>).
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.
