A Wideband Transmitarray Antenna Design Based on The Transmission Characteristic of Unit Cell

Document Type : Research Article

Authors

Department of Electrical Engineering, Yazd University, Yazd, Iran

Abstract

In this paper a procedure is proposed to design a wideband transmitarray upon a specified frequency band. In this way, phase control parameter of unit cell is adjusted in a suggested range ensuring linear phase change and low transmission loss over the band. The unit cell is designed, for a range of phase control parameter (e.g. slot length in a CSRR) in which, 360° phase variation is provided. Part of this range is applied for the central elements of TA, in which the maximum overlapped passband (for different values of phase control parameter) around the desired frequency to be achieved. In this way, a scenario for the phase specification of the array elements would be obtained. This range is specially applied for the central elements of the array which are in exposure of feed peak power. As a proof of concept, an 14×14 elements transmitarray is designed and fabricated based on a back to back square complementary split ring resonator (CSRR). Measurement results indicate maximum gain, 1-dB bandwidth and aperture efficiency of 24.6 dB, 18.4% and 53% respectively at the center frequency of 11.5GHz. At the end of the paper, a comparison between proposed TA and the previous ones is provided.

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