A Double-Layer Metal-Only Transmitarray for Beam Scanning

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Abstract
A novel metal-only transmitarray (TA) operating in linear polarization in the $X$ -band for beam scanning is proposed in this article. It is composed of metal-only unit cells with a double-layer structure, which obtains a complete 360 $^{\circ }$ phase shift range with low loss by adjusting the length of interleaved slots etched on the thin metal sheets. The feed displacement technique is used as a feasible mechanical control approach for beam scanning, and bifocal phase distribution is designed for the TA to improve the gain roll-off and the scanning coverage. In order to demonstrate the design scheme, a TA prototype consisting of 24 × 24 unit cells has been fabricated and measured. The measured results show that the proposed TA can achieve a maximum gain of 27.8 dBi at 10 GHz, and a scanning coverage from $-25^{\circ }$ to $+25^{\circ }$ with side-lobe level lower than 10 dB.
Funding Information
  • National Natural Science Foundation of China (62101426, 62301417)

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