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A Double-Layer Metal-Only Transmitarray for Beam Scanning
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DOI：10.1109/LAWP.2024.3471851.png)
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Abstract
En 中文
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 degrees 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 x 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 degrees to +25 degrees with sidelobe level lower than 10 dB.
Keywords:
Metals
Phased arrays
Gain
Apertures
Passband
Insertion loss
Reflector antennas
Antenna feeds
Air gaps
Wireless communication
Beam scanning
metal only
transmitarray (TA)
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