Compact Antenna Test Range Using Very Small F/D Transmitarray Based on Amplitude Modification and Phase Modulation

A very small focal-to-diameter (F/D) ratio transmitarray for compact antenna test range (CATR) application is proposed in this article. The transmitarray comprises a feed antenna, a metasurface for phase modulation (MPM), and another one for amplitude modification (MAM). MPM and MAM are implemented...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2022, Vol.71, p.1-14
Main Authors: Tang, Jiazhi, Chen, Xiaoming, Meng, Xiangshuai, Wang, Zhengpeng, Ren, Yuxin, Pan, Chong, Huang, Xiaoyu, Li, Mengting, Kishk, Ahmed A.
Format: Article
Language:English
Subjects:
Amplitudes
Antenna measurements
Antennas
Collimators
Compact antenna test range (CATR)
Design modifications
Lenses
metasurface
Metasurfaces
Phase modulation
Plane waves
quiet zone
Substrates
Testing
transmitarray
Wave generation
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Summary:A very small focal-to-diameter (F/D) ratio transmitarray for compact antenna test range (CATR) application is proposed in this article. The transmitarray comprises a feed antenna, a metasurface for phase modulation (MPM), and another one for amplitude modification (MAM). MPM and MAM are implemented using the same metasurface cell but with different cell selections and arrangements. A holistic phase-only design method determines whether the metasurface is for amplitude modification or phase modulation. A CATR collimator with an overall low profile is realized through the joint design of MAM and MPM. The proposed technique overcomes the limits of the ordinary metasurface lenses and enables plane wave generation with a short focal length and sizeable quiet zone. The resulting CATR demonstrates a 50% quiet zone of the aperture size with ±0.5-dB amplitude and ±5° phase errors by full-wave simulation. For further verification, a prototype is fabricated, and its experimental results confirm the simulations.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2022.3150835