期刊
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
卷 17, 期 8, 页码 1533-1537出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2018.2853193
关键词
Cavity reflector; circularly polarized (CP) antenna; crossed dipole; parasitic element; polarization-reconfigurable; wideband antenna
资金
- Vietnam National Foundation for Science and Technology Development (NAFOSTED) [103.05-2016.37]
A circularly polarized (CP) crossed-dipole antenna with switchable rotating sense is presented. The proposed design has two main attractive features. First, a wide overlapped CP bandwidth (BW) is realized for both operating states. Second, unlike existing designs targeting a similar functionality, no biasing wire through ground plane is required, which significantly reduces the design complexity. The proposed design employs parasitic elements for two different roles. For RF signal, these parasitic elements open an additional CP resonance band to enhance the axial-ratio (AR) BW. Additionally, through RF chokes, they provide a de path to bias the p-i-n diodes. An antenna prototype was experimentally demonstrated with the capability of switching between two CP rotating senses in a frequency range from 1.1 to 2.02 GHz, equivalent to 58.9%. The antenna also exhibits a wide -10 dB impedance BW of 53.3% (1.1-1.9 GHz) with a peak gain of around 9.1 dBi and front-to-back ratio of more than 15 dB.
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