A Low-Profile Broadband Metasurface Antenna With Polarization Conversion Based on Characteristic Mode Analysis

Dong, Jian; Wu, Rigeng; Pan, Yaxi

doi:10.3389/fphy.2022.860606

Cited by 7 publications

(4 citation statements)

References 28 publications

(19 reference statements)

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“…TCM is being widely used to design high-performance metasurfaces for multiple applications which include but are not limited to circular polarization, wide bandwidth, and polarization conversion [27][28][29][30][31][32][33]. Circular polarization is achieved by exciting orthogonal modes and mode suppression is utilized for the high performance [27].…”

Section: Introductionmentioning

confidence: 99%

“…An active frequency selective surface is designed using the fundamental mode of the structure; the design involves the improvement of isolation between the two states transparent/reflective using CMA [32]; however, the technique only involves the study of the amplitude of s-parameters. The deviation between the characteristic angle values has also been studied to achieve polarization conversion in metasurfaces [33]. Most of the reported designs provide insight into the working mechanisms of structures using the amplitude of the s-parameters.…”

Section: Introductionmentioning

confidence: 99%

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A New Unit-Cell Design for a 2-Bit Reflective Metasurface for RIS Applications

Fazal,

Hong

2023

Electronics

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In this research, a novel unit-cell design for a 2-bit reflective metasurface using the theory of characteristic modes is presented. The initial unit-cell consists of three sub-patches with 2-PIN diodes integrated within the gaps between sub-patches. The initial structure provides limited tuning of the phase curves with the change in switching states of PIN diodes. To provide the phase deviation required for the 2-bit operation, the symmetry of the modal currents is used to propose multiple slots in the sub-patches. Slots are introduced to lower the resonant frequencies, as well as provide tuning of the resonance of modes and consequently phase change between different switching states. For further resonance tuning and phase optimization, two vias are loaded in the middle patch to provide a 90° phase difference between each switching state. Simulated results show that the proposed unit-cell design with the aid of characteristic modes has a smaller size and provides 2-bit operation in the frequency range of 3.9–4.04 GHz.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A New Unit-Cell Design for a 2-Bit Reflective Metasurface for RIS Applications

Fazal,

Hong

2023

Electronics

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“…For example, it can extract events, institutions, and people relations from reports. Therefore, relation extraction is widely used in downstream natural language processing (NLP) tasks, such as information relation extraction [1,2], knowledge network construction [3,4], and intelligent question-answering systems [5,6].…”

Section: Introductionmentioning

confidence: 99%

Contextual Semantic-Guided Entity-Centric GCN for Relation Extraction

et al. 2022

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Relation extraction tasks aim to predict potential relations between entities in a target sentence. As entity mentions have ambiguity in sentences, some important contextual information can guide the semantic representation of entity mentions to improve the accuracy of relation extraction. However, most existing relation extraction models ignore the semantic guidance of contextual information to entity mentions and treat entity mentions in and the textual context of a sentence equally. This results in low-accuracy relation extractions. To address this problem, we propose a contextual semantic-guided entity-centric graph convolutional network (CEGCN) model that enables entity mentions to obtain semantic-guided contextual information for more accurate relational representations. This model develops a self-attention enhanced neural network to concentrate on the importance and relevance of different words to obtain semantic-guided contextual information. Then, we employ a dependency tree with entities as global nodes and add virtual edges to construct an entity-centric logical adjacency matrix (ELAM). This matrix can enable entities to aggregate the semantic-guided contextual information with a one-layer GCN calculation. The experimental results on the TACRED and SemEval-2010 Task 8 datasets show that our model can efficiently use semantic-guided contextual information to enrich semantic entity representations and outperform previous models.

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“…The key feature of a tensorial metasurface is the opportunity to obtain the desirable polarization, amplitude, and shape of the wavefront radiation [24,25].…”

Section: Introductionmentioning

confidence: 99%

Design of a multibeam metasurface antenna for LEO satellite communications payload

Chesnitskiy

Kosmynin²,

Kosmynina

et al. 2022

Eng. Res. Express

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In this paper, we propose a novel method for synthesizing a multibeam metasurface antenna (MSA) for use in a space application - a payload component of a small satellite as part of a low Earth orbit (LEO) satellite communication constellation. MSA is synthesized using the holographic technique with a divergent phase distribution. Using this method, a low-cost multi-beam Ku-band antenna with seven flattened beams is developed. The results of the numerical simulation and experimental study of the proposed seven-beam MSA were presented. The gain of each beam is about 25 dBi, the aperture efficiency of the MSA is ~40%. Each individual beam had a separate feed point and its own inclination angle (0°, ±3.5°, ±7°, ±10.5°). This paper shows that the presented MSA is not inferior in its characteristics to similar solutions, but is more compact and lighter, and also allows the formation of complex radiation patterns.

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A Low-Profile Broadband Metasurface Antenna With Polarization Conversion Based on Characteristic Mode Analysis

Cited by 7 publications

References 28 publications

A New Unit-Cell Design for a 2-Bit Reflective Metasurface for RIS Applications

A New Unit-Cell Design for a 2-Bit Reflective Metasurface for RIS Applications

Contextual Semantic-Guided Entity-Centric GCN for Relation Extraction

Design of a multibeam metasurface antenna for LEO satellite communications payload

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