A Low-Loss Defected-Ground-Structure Based Phase Shifter and Antenna on a 4-μm Thin Liquid Crystal Layer
In this paper, a liquid crystal (LC) phase shifter is proposed using a defected-ground-structure (DGS) transmission line on a 4-<inline-formula> <tex-math notation="LaTeX">$\mu \text{m}$ </tex-math></inline-formula>-thin LC layer. The DGS transmission line is a modi...
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| Format: | Article |
| Language: | English |
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IEEE
2023-01-01
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| Series: | IEEE Access |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/10092754/ |
| _version_ | 1797847340326846464 |
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| author | Sungeun Kim Chan-Byoung Chae Byung-Wook Min |
| author_facet | Sungeun Kim Chan-Byoung Chae Byung-Wook Min |
| author_sort | Sungeun Kim |
| collection | DOAJ |
| description | In this paper, a liquid crystal (LC) phase shifter is proposed using a defected-ground-structure (DGS) transmission line on a 4-<inline-formula> <tex-math notation="LaTeX">$\mu \text{m}$ </tex-math></inline-formula>-thin LC layer. The DGS transmission line is a modified micro-strip line that improves phase shift and loss in a 4-<inline-formula> <tex-math notation="LaTeX">$\mu \text{m}$ </tex-math></inline-formula>-thin LC layer by partially removing the ground plane. The phase shift is achieved through the variation of the LC dielectric constant caused by the bias voltage of the DGS transmission line. The proposed DGS phase shifter exhibits the highest figure-of-merit (FoM) of 61.5°/dB at 30 GHz. Furthermore, the phase shifter exhibits an rms phase error of less than 20° at 26-30 GHz and a 1-dB compression point of 30 dBm with 2.5° phase error at 35 dBm. To demonstrate the feasibility of the LC-based antenna array systems, the DGS phase shifter is combined with a patch antenna, resulting in a gain of 0 dBi and 360° phase shift at 18 GHz. The thin LC layer and high FoM make the proposed DGS phase shifter a suitable solution for use in large phased array systems and reconfigurable intelligent surfaces. |
| first_indexed | 2024-04-09T18:09:44Z |
| format | Article |
| id | doaj.art-160e8c5004bc419dacd2323fa083f7f2 |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-04-09T18:09:44Z |
| publishDate | 2023-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-160e8c5004bc419dacd2323fa083f7f22023-04-13T23:00:15ZengIEEEIEEE Access2169-35362023-01-0111349523495710.1109/ACCESS.2023.326463910092754A Low-Loss Defected-Ground-Structure Based Phase Shifter and Antenna on a 4-μm Thin Liquid Crystal LayerSungeun Kim0https://orcid.org/0009-0001-7718-2557Chan-Byoung Chae1https://orcid.org/0000-0001-9561-3341Byung-Wook Min2https://orcid.org/0000-0001-7456-8713School of Electrical and Electronic Engineering, Yonsei University, Seoul, South KoreaSchool of Integrated Technology, Yonsei University, Seoul, South KoreaSchool of Electrical and Electronic Engineering, Yonsei University, Seoul, South KoreaIn this paper, a liquid crystal (LC) phase shifter is proposed using a defected-ground-structure (DGS) transmission line on a 4-<inline-formula> <tex-math notation="LaTeX">$\mu \text{m}$ </tex-math></inline-formula>-thin LC layer. The DGS transmission line is a modified micro-strip line that improves phase shift and loss in a 4-<inline-formula> <tex-math notation="LaTeX">$\mu \text{m}$ </tex-math></inline-formula>-thin LC layer by partially removing the ground plane. The phase shift is achieved through the variation of the LC dielectric constant caused by the bias voltage of the DGS transmission line. The proposed DGS phase shifter exhibits the highest figure-of-merit (FoM) of 61.5°/dB at 30 GHz. Furthermore, the phase shifter exhibits an rms phase error of less than 20° at 26-30 GHz and a 1-dB compression point of 30 dBm with 2.5° phase error at 35 dBm. To demonstrate the feasibility of the LC-based antenna array systems, the DGS phase shifter is combined with a patch antenna, resulting in a gain of 0 dBi and 360° phase shift at 18 GHz. The thin LC layer and high FoM make the proposed DGS phase shifter a suitable solution for use in large phased array systems and reconfigurable intelligent surfaces.https://ieeexplore.ieee.org/document/10092754/Phase shifterliquid crystal delay linedefected ground structurepatch antennaphased arrayreconfigurable intelligent surface |
| spellingShingle | Sungeun Kim Chan-Byoung Chae Byung-Wook Min A Low-Loss Defected-Ground-Structure Based Phase Shifter and Antenna on a 4-μm Thin Liquid Crystal Layer IEEE Access Phase shifter liquid crystal delay line defected ground structure patch antenna phased array reconfigurable intelligent surface |
| title | A Low-Loss Defected-Ground-Structure Based Phase Shifter and Antenna on a 4-μm Thin Liquid Crystal Layer |
| title_full | A Low-Loss Defected-Ground-Structure Based Phase Shifter and Antenna on a 4-μm Thin Liquid Crystal Layer |
| title_fullStr | A Low-Loss Defected-Ground-Structure Based Phase Shifter and Antenna on a 4-μm Thin Liquid Crystal Layer |
| title_full_unstemmed | A Low-Loss Defected-Ground-Structure Based Phase Shifter and Antenna on a 4-μm Thin Liquid Crystal Layer |
| title_short | A Low-Loss Defected-Ground-Structure Based Phase Shifter and Antenna on a 4-μm Thin Liquid Crystal Layer |
| title_sort | low loss defected ground structure based phase shifter and antenna on a 4 x03bc m thin liquid crystal layer |
| topic | Phase shifter liquid crystal delay line defected ground structure patch antenna phased array reconfigurable intelligent surface |
| url | https://ieeexplore.ieee.org/document/10092754/ |
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