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2023, Volume 24, Issue 6

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Frontiers of Information Technology & Electronic Engineering >> 2023, Volume 24, Issue 6 doi: 10.1631/FITEE.2200539

Wideband circular-polarized transmitarray for generating a high-purity vortex beam

Affiliation(s): State Key Laboratory of Information Photonics and Optical Communications, Beijing 100876, China; MOE Key Laboratory of Universal Wireless Communications, Beijing 100876, China; Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing 100876, China; School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China; Beijing Institute of Spacecraft System Engineering, Beijing 100094, China; less

Received: 2022-11-03 Accepted: 2023-07-03 Available online: 2023-07-03
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Abstract

In this correspondence, a wideband circular-polarized (CP) transmitarray (TA) in the Ka-band is presented for generating a high-purity vortex beam. The proposed element is composed of two identical combinations separated by an air layer. The subwavelength structure and double-resonance characteristics ensure the stable phase shift of the element within the 1-dB transmission bandwidth of 28.4%. A square aperture TA fed by a horn antenna is fabricated and measured. Owing to the honeycomb arrangement of elements, the mode purity of l​​=​​−1 is >0.93 in a wide band from 28.5 to 38 GHz. The measured peak gain is 22.3 dBic, and the 3-dB axial ratio bandwidth is 27.6%. The performance of the proposed antenna demonstrates its potential for high-capacity wireless communication and high-quality radar imaging.

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