A Broadband Circularly Polarized Reflectarray with Magneto-Electric Dipole Elements

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Number of pages6
Journal / PublicationIEEE Transactions on Antennas and Propagation
Online published8 Apr 2021
Publication statusOnline published - 8 Apr 2021


This paper reports a broadband circularly polarized (CP) reflectarray operating at X band. An asymmetric dual-polarized magneto-electric (ME) dipole is proposed as the reflectarray element to realize broadband cophasal far-field radiation based on the element rotation technique. Broad bandwidth and high-purity circular polarization are achieved. The fabricated prototype shows a 1.5-dB axial ratio (AR) and 3-dB AR bandwidth of 37% and 42%, respectively. Peak gain of 25.4 dBic and peak aperture efficiency of 60% are experimentally obtained. The aperture efficiency remains higher than 45% over a wide bandwidth spanning from 8.3 to 12.4 GHz. Specifically, the proposed element can be realized on an airgap-free low-profile single-board substrate configuration, owing to the wideband characteristic of the ME dipole. This comparatively robust and easy-to-fabricate structure would be desirable for many applications including broadband satellite communications.

Research Area(s)

  • Broadband antennas, Broadband communication, Circular polarization, Dipole antennas, high-gain antenna, magneto-electric (ME) dipole, reflectarray, Reflection, Reflector antennas, Substrates, Wideband, wideband antenna