4.7 Article

A Circularly Polarized 1 Bit Electronically Reconfigurable Reflectarray Based on Electromagnetic Element Rotation

期刊

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 69, 期 9, 页码 5585-5595

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2021.3069551

关键词

Beam steering; circular polarization; high-gain antenna; patch antenna; reconfigurable reflectarray

资金

  1. National Natural Science Foundation of China (NSFC) [61901106]
  2. Natural Science Foundation of Jiangsu Province [BK20190347, BK20200506]
  3. Open Research Program of State Key Laboratory of Millimeter Waves [K202107]
  4. ZhiShan Young Scholar Program of Southeast University

向作者/读者索取更多资源

This article reports a circularly polarized reflectarray with 2-D electronically steerable beam and introduces a new design approach to simplify element configuration and reduce the number of required diodes. Experimental results confirm the design's beam focusing, dynamic beam steering capabilities, as well as polarization purity and aperture efficiency.
A circularly polarized (CP) reflectarray with 2-D electronically steerable beam is reported. The reconfigurable CP reflectarray element is realized using a circular-patch-based structure with p-i-n diodes incorporated. A new electronical phase manipulation method is proposed based on the element rotation technique and by additionally exploiting symmetries in the field distribution of the element's fundamental resonant mode. Element rotation can be equivalently achieved by altering the biasing voltage and changing the electromagnetic behavior of the reflective phasing cell. The proposed design approach brings about simplification in element configuration, leading to a reduction in the number of required diodes by a factor of one half. Practical concerns of the element and biasing complexity as well as the insertion loss are, therefore, well-handled. A fully functional 16 x 16 reconfigurable CP reflectarray is designed, fabricated, and tested to validate the concept. Good beam focusing and 2-D dynamic beam steering capabilities are confirmed through experiments, along with decent polarization purity and comparatively high aperture efficiency. The proposed simple and robust design could be attractive for implementing lightweight, low-cost, and large-scale 2-D reconfigurable CP reflectarrays.

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