科研之友
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摘要
A circularly polarized (CP) crossed-dipole antenna with enhanced 3-dB axial ratio (AR) beamwidth and gain via the addition of parasitic elements is proposed in this letter. First, a simplified CP crossed-dipole model loaded with four parasitic elements is constructed to investigate the principle of wide axial-ratio beamwidth. Theoretical analysis shows that by choosing the length and position of these parasitic elements properly, the 3 dB AR beamwidth of the simplified CP antenna can be enhanced significantly. Then, a practical CP crossed-dipole antenna designed at 1.575 GHz is utilized to verify the feasibility of this method. Experimental results are in a good agreement with the simulated ones in terms of radiation pattern, gain, AR and |S-11| for the proposed antenna. In particular, due to the addition of the four parasitic elements, the 3 dB AR beamwidth of the antenna at the central frequency of 1.575 GHz is increased from 72 degrees to 134 degrees; the gain in the working frequency bandwidth also shows an increase of almost 3 dBi when these parasitic elements are added.
- 出版日期2017-11
- 单位华南理工大学
