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Circular polarized electronically-controlled antenna array based on CRLH-TL |
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| Authors: | Jiahui Fu Wan Chen Changfei Zhou Lei Zhu Qun Wu |
| Affiliation: | 1. Harbin Institute of Technology, Harbin, China 2. Communication and Electronics Engineering Institute, Qiqihar University, Qiqihar, 161006, China 3. Department of Microwave Engineering, Harbin Institute of Technology, Harbin, 150001, China |
| Abstract: | In this paper, a circular polarized electronically-controlled scanning microstrip antenna array is designed, which is based on composite right left-handed transmission line (CRLH TL) and is realized by varactor diodes. Proposed electronically-controlled antenna arrays till now are always linear-polarized as the axial ratio (AR) may be spoiled by the DC feed line, especially in the CRLH TL based case. A more separated CRLH TL integrated with active lumped elements is utilized to solve the problem. The antenna array is composed of the CRLH microstrip transmission line structure and circular polarized microstrip antenna. The direction of the main lobe varies from ?1° to ?20 ° by continuously modifying the varactor diodes bias voltages from 0 to 20 V with 5 V as a step. The AR remains below 3 dB in the scanning range. The simulation and experimental results show a good consistence. |
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