Development of Omnidirectional CP Antennas and Arrays: Invited

Publication Type:
Conference Proceeding
Citation:
2019 International Conference on Microwave and Millimeter Wave Technology, ICMMT 2019 - Proceedings, 2019
Issue Date:
2019-05-01
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© 2019 IEEE. This paper summarizes the design concepts, operating principles, and application examples of advanced omnidirectional circularly polarized (OCP) antennas and arrays. The design of an OCP antenna with a figure eight-shaped pattern is introduced. It is realized by exciting two parallel-oriented electric and magnetic radiators with a 90° phase difference. The diameter of the loop current that generates the magnetic radiator is small, D approx {lambda}/10. As an applications example, a 28 GHz highly compact OCP antenna is reported for 5G Device-to-Device (D2D) communications. The design of an OCP antenna having a conical pattern is also discussed. The conical OCP pattern is realized when both the electric and magnetic radiators are placed above a ground plane. The diameter of the loop current is large, D approx 1 lambda. An example of a low profile and wideband OCP antenna radiating a conical pattern is demonstrated and its reconfigurable version is also discussed. Finally, an OCP array is presented that achieves high broadside directivity. It is based on an innovative method to realize collinear electric and magnetic radiators.
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