Transmission efficiency limit of single-switch and cascaded reconfigurable transmitarray elements
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866910410448306176 |
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| author | Liu, Changhao Yang, Fan Xu, Shenheng Li, Maokun |
| author_facet | Liu, Changhao Yang, Fan Xu, Shenheng Li, Maokun |
| contents | Reconfigurable transmitarray antennas (RTAs) are rapidly gaining popularity, but optimizing their performance requires systematic design theories. In particular, establishing a performance limit theory for RTA elements is valuable. This paper presents a transmission efficiency limit theory for single-switch RTA elements and their cascaded extensions. Employing microwave network analysis, we analytically investigate single-switch RTA elements, demonstrating that their transmission coefficients under two states must lie on or within a specific unit circle on the Smith chart. Therefore, the transmission phase difference is tightly constrained by the transmission amplitudes, indicating that the phase-shifting ability of a single-switch RTA element is limited. Subsequently, this analysis is extended to cascaded RTA elements. By cascading several single-switch layers, the phase variation range is extended, enabling the realization of 1-bit phase shifts with high transmission amplitudes. These findings have significant impact on the design and optimization of RTA elements. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2303_06826 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Transmission efficiency limit of single-switch and cascaded reconfigurable transmitarray elements Liu, Changhao Yang, Fan Xu, Shenheng Li, Maokun Applied Physics Reconfigurable transmitarray antennas (RTAs) are rapidly gaining popularity, but optimizing their performance requires systematic design theories. In particular, establishing a performance limit theory for RTA elements is valuable. This paper presents a transmission efficiency limit theory for single-switch RTA elements and their cascaded extensions. Employing microwave network analysis, we analytically investigate single-switch RTA elements, demonstrating that their transmission coefficients under two states must lie on or within a specific unit circle on the Smith chart. Therefore, the transmission phase difference is tightly constrained by the transmission amplitudes, indicating that the phase-shifting ability of a single-switch RTA element is limited. Subsequently, this analysis is extended to cascaded RTA elements. By cascading several single-switch layers, the phase variation range is extended, enabling the realization of 1-bit phase shifts with high transmission amplitudes. These findings have significant impact on the design and optimization of RTA elements. |
| title | Transmission efficiency limit of single-switch and cascaded reconfigurable transmitarray elements |
| topic | Applied Physics |
| url | https://arxiv.org/abs/2303.06826 |