An Efficient Approach for Designing Ultrathin Transmitarray Antennas Based on Equivalent Circuit Analysis
We present an ultrathin and wideband transmitarray antenna formed from unit-cells with an ultralow thickness of <inline-formula> <tex-math notation="LaTeX">0.04 \lambda _{0} </tex-math></inline-formula>. The unit-cells are constructed from two identical substrates w...
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Published in | IEEE transactions on antennas and propagation Vol. 72; no. 7; pp. 5810 - 5821 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
New York
IEEE
01.07.2024
The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subjects | |
Online Access | Get full text |
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Summary: | We present an ultrathin and wideband transmitarray antenna formed from unit-cells with an ultralow thickness of <inline-formula> <tex-math notation="LaTeX">0.04 \lambda _{0} </tex-math></inline-formula>. The unit-cells are constructed from two identical substrates with three metallic layers to provide a 90° polarization rotation of the incident wave. An efficient and simple way to design the low thickness unit-cell is presented based on the analysis of its equivalent circuit (EQC). To demonstrate the method, we designed and optimized unit-cells operating at center frequency of 12 GHz to provide a 3-bit phase resolution with eight phase states. Full-wave simulation results demonstrate that eight phase states have a large common 1 dB transmission magnitude bandwidth of 27%. A transmitarray prototype using the 3-bit phase shift unit cells was also fabricated. Measurements show that the transmitarray achieves a high aperture efficiency of 62% and a large 1 dB gain bandwidth of 22%. |
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ISSN: | 0018-926X 1558-2221 |
DOI: | 10.1109/TAP.2024.3412235 |