A Novel Design Method for High Efficiency Quasi-2-Bit Reconfigurable Metasurface Antennas
- Authors
- Nam, Yong-Hyun; Lee, Sun-Gyu; Lee, Jeong-Hae
- Issue Date
- May-2024
- Publisher
- Institute of Electrical and Electronics Engineers Inc.
- Keywords
- Antennas and propagation; aperture efficiency; beam steering; gain; Least mean squares methods; least square method; Mathematical models; Metasurfaces; Phase control; phase quantization; PIN diode; Quantization (signal); reconfigurable metasurface; Switches
- Citation
- IEEE Transactions on Antennas and Propagation, v.72, no.5, pp 1 - 1
- Pages
- 1
- Journal Title
- IEEE Transactions on Antennas and Propagation
- Volume
- 72
- Number
- 5
- Start Page
- 1
- End Page
- 1
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/33046
- DOI
- 10.1109/TAP.2024.3383224
- ISSN
- 0018-926X
1558-2221
- Abstract
- This communication proposes a novel design method for a quasi-2-bit reconfigurable metasurface antenna (RMA) to improve aperture efficiency using a simple bias circuit. The quasi-2-bit RMA is designed by combining two types of 1-bit unit cells to achieve four quantized phase states, which results in quantization efficiencies similar to an ideal 2-bit for a specific direction while maintaining a simple 1-bit bias circuit. Furthermore, this RMA can also be designed for multiple beam directions by optimizing the combination of the 1-bit unit cells using the least square method. The quasi-2-bit RMA is then experimentally verified by fabricating a structure optimized for two beam switching angles of ±18° in the E-plane. The aperture efficiencies of the quasi-2-bit RMA are measured to be 25.1% for -18° and 28.1% for 18°, respectively. Compared to 1-bit RMAs, the measured aperture efficiency of the quasi-2-bit RMA are improved by 61.49% for the -18° beam and by 114.2% for the 18° beam, respectively. IEEE
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