4.6 Article

Circularly Polarized One-Bit Reconfigurable ME-Dipole Reflectarray at X-Band

Journal

IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
Volume 21, Issue 3, Pages 496-500

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2021.3136549

Keywords

Antenna measurements; Prototypes; Dipole antennas; Broadband antennas; Reflector antennas; Reflection; Gain; Circular polarization; magneto-electric (ME) dipole; reconfigurable antenna; reflectarray; wideband

Funding

  1. National Natural Science Foundation ofChina [61901106, 62101175, 62122019]
  2. Natural Science Foundation of Jiangsu Province [BK20190347, BK20200506]
  3. Hong Kong Scholars Program [XJ2021016]

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This article reports a broadband and low loss circularly polarized electronically reconfigurable reflectarray antenna that operates over the X-band. By introducing a new reconfigurable magneto-electric dipole element and combining it with an engineered wideband ME-dipole element and low loss reconfigurable perturbation structure, superior circular polarized bandwidth and high efficiency are achieved.
In this letter, a broadband and low loss circularly polarized (CP) electronically reconfigurable reflectarray antenna (RRA) that can operate over the X-band is reported. The proposed RRA invokes a new reconfigurable magneto-electric (ME) dipole based element for dynamically manipulating the phase of the back-scattered CP wave from each pixel, and hence, the direction of the reflected beam. The engineered wideband ME-dipole element and the design of a low loss reconfigurable perturbation structure contribute jointly to a superior CP bandwidth as well as a high efficiency. A reflectarray prototype with two-dimensional (2-D) beam scanning is designed, fabricated, and measured, demonstrating a wide-angle beam scanning capability. Besides, notable advances in bandwidth and aperture efficiency of the 1-bit CP RRA are identified, over the previous state of the art.

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