圆极化高温超导微带天线阵  

Circularly polarized HTS microstrip antenna array

作　　者：彭国民[1] 张永[1] 方进[1] 丘明[1] 

机构地区：[1]北京交通大学电气工程学院,北京100044

出　　处：《低温工程》2007年第6期59-62,67,共5页Cryogenics

基　　金：北京交通大学校人才基金(EJ06012)

摘　　要：在0.62 mm厚的MgO衬底上,设计和制造了一个用于直接广播卫星(DBS)系统的圆极化和单一馈电网络的四单元高温超导微带天线阵,中心频率为12.2 GHz。为了比较,一个天线采用金膜制造,另一个采用超导薄膜钇钡铜氧(YBCO)制造。为了提高圆极化阵的轴比特性,运用连续旋转技术,分别在室温和液氮温度下测试效率、方向性、回波损耗和带宽。采用超导薄膜钇钡铜氧(YB-CO)制造的阵表现出很好的圆极化特性,在77 K时的增益比室温时的金膜天线阵大1.64 dB。在谐振频率12.24 GHz时回馈损耗为-30.6 dB,总有效带宽约为3.52%,表明当高温超导体用于微带天线阵时,能提高天线阵的效率。A four-element, 12.2 GHz, high temperature superconducting（HTS） microstrip antenna array with corporate feed network and circular polarization for direct broadcasting satellite （DBS） system was designed and built on a 0.62 mm thick MgO substrate. In order to compare each other, one antenna pattern was fabricated from gold thin film, and a second pattern was fabricated from YBa2Cu307-x（YBCO） superconducting thin film. To improve the axial ratio of circularly polarized arrays, sequential rotation technique was used. Efficiency, radiation pattern, return loss and bandwidth were measured for both antennas at room temperature and at cryogenic temperatures. The array produced good circular polarization, and the gain of the array at 77 K, relative to a gold array at room temperature was approximately 1.64 dB. The measured return loss of HTS antenna array was 30.6 dB at the resonant frequency of 12.24 GHz and the total effective bandwidth was about 3.52%. The results showed that high temperature superconductors, when used in microstrip arrays,could improve the efficiency of the circularly polarized HTS antenna array.

关 键 词：圆极化 超导天线 钇钡铜氧 

分 类 号：TB663[一般工业技术—制冷工程] O514.2[理学—低温物理]