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Progress In Electromagnetics Research Letters
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A WIDEBAND TRANSMITARRAY USING DOUBLE-PETAL LOOP ELEMENTS

By C. Tian, Y.-C. Jiao, and G. Zhao

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Abstract:
In this letter, a four-layer transmitarray operating at 9.5 GHz is designed using a double-petal loop element as the unit cell. A configuration of the double-petal loop elements is used to increase transmission phase variation while maintaining a wide transmission magnitude bandwidth of the unit cell, and a full transmission phase range of 360° is achieved for a transmission magnitude equals to or better than -2.4 dB. Furthermore, the oblique performance of the unit cell is also good. Then, a prime-focus 676-element microstrip transmitarray with the proposed element is fabricated and measured. The highest measured gain is about 22.15 dBi at 9.8 GHz, resulting in a 31% aperture efficiency. The antenna bandwidth of 10.2% (from 9.3 to 10.3 GHz) for 1 dB-gain is achieved in this design.

Citation:
C. Tian, Y.-C. Jiao, and G. Zhao, "A Wideband Transmitarray Using Double-Petal Loop Elements," Progress In Electromagnetics Research Letters, Vol. 59, 57-62, 2016.
doi:10.2528/PIERL16012801

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