关键词: 极化旋转超表面/
圆极化天线/
极化调控
English Abstract
A circular polarization antenna designed based on the polarization conversion metasurface
Li Wen-Hui1,Zhang Jie-Qiu1,
Qu Shao-Bo1,
Shen Yang1,
Yu Ji-Bao1,
Fan Ya1,
Zhang An-Xue2
1.College of Science, Air Force Engineering University, Xi'an 710051, China;
2.School of Information and Communication Engineering, Xi'an Jiaotong University, Xi'an 710049, China
Fund Project:Project supported by the National Natural Science Foundation of China (Grant Nos. 61471388, 61331005, 11204378, 11274389), the China Postdoctoral Science Foundation (Grant Nos. 2013M532131, 2013M532221), the Aviation Science Foundation of China (Grant Nos. 20132796018, 20123196015), and the Fundamental Research Project of Shaanxi Province, China (Grant No. 2013JM6005).Received Date:17 August 2015
Accepted Date:23 September 2015
Published Online:20 January 2016
Abstract:A novel circular porlarization (CP) antenna is designed and fabricated by loading a kind of polarization conversion metasurface. The structure of polarization conversion metasurface is composed of metal slash and copper ground sheet, which is separated by an FR4 dielectric substrates with a thickness h=3 mm. When a normal electromagnetic wave incident on the whole surface vertically, the electric field of the wave can be decomposed into two components Evi and Evi. Under the excitation of the two components, resonance is induced between the metal slash and the copper ground sheet respectively, making their own reflection phase changed to = u - v = 180, eventually making the reflection wave appear with 90 polarization rotation. By taking the peculiarity of 90polarization rotation of the polarization conversion metasurface, we can modulate the linear polarization of microstrip slot antenna into the circular polarization radiation. Through adjusting the distance between the slot antenna and the polarization rotation metasurface, we can regulate the working frequency of the circular polarization. Simulated and experimental results show that the polarization conversion metasurface makes a high-efficiency polarization rotation at 8-12 GHz. And the center working frequency of the CP antenna is 9.1 GHz, the impedance bandwidth is 8.3-10 GHz. When the distance H = 4.5 mm between the microstrip slot antenna and the polarization conversion metasurface, the 3 dB axial ratio bandwidth is 8.3-8.8 GHz, the microstrip slot antenna may realize circular polarized radiation. When H = 20 mm, the 3 dB axial ratio bandwidth is 8.8-9.3 GHz, and the slot antenna can realize circular polarized radiation. When H = 8 mm, the 3 dB axial ratio bandwidth is 9.3-10 GHz, the slot antenna can realize circular polarized radiation. Experimental results are in agreement with the simulation results, showing the validity of this design method which may become a new approach for the CP antennain designing
Keywords: polarization conversion metasurface/
circular porlarization antenna/
axial ratio
