A Generalized Method for Gain Bandwidth Enhancement of Transmitarray Antennas Considering Oblique Incidences

Yang Cai, Peng Mei*, Xian Qi Lin, Shuai Zhang

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Abstract

This brief introduces a generalized phase compensation method to enhance gain, 1-dB gain bandwidth of transmitarrays considering oblique incidences. This method is based on studying the transmission phase of each element in the holistic framework of a transmitarray, where all oblique incidences to each element are included. As a result, the actual transmission phase of every element at different spatial positions involving oblique incidence effects can be obtained, which is leveraged to improve the performance of transmitarrays. The proposed method is especially efficient for transmitarrays with discrete phase states. For proof of the concept, dielectric lenses with a 2-bit phase quantization are configured to demonstrate performance enhancement. The simulated results show that the gain enhancement of 1.67 dB, 3.41 dB, and 4.5 dB at 26 GHz can be achieved when the focal length-to-diameter ratio (F/D) is 0.37, 0.24, and 0.14, respectively, which are experimentally verified by the measured results.

OriginalsprogEngelsk
TidsskriftI E E E Transactions on Circuits and Systems. Part 2: Express Briefs
Vol/bind71
Udgave nummer1
Sider (fra-til)121-125
Antal sider5
ISSN1549-7747
DOI
StatusUdgivet - jan. 2024

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