Ultra-Thin Broadband Circular Polarization Conversion Metasurface for Full-Space Wavefront Manipulation Application

IEEE photonics journal, Journal Year: 2023, Volume and Issue: 15(4), P. 1 - 9

Published: July 7, 2023

In this paper, we introduced an ultra-thin broadband single-layer metasurface (MS) comprising S-shaped resonator (SSR) structure enclosed by a circular cover adhered on dielectric substrate. The MS exhibits remarkable capabilities in achieving simultaneous half-transmission and half-reflection for polarization (CP) conversion, as well full-space wavefront manipulation the microwave frequency range. Through simulations experiments, demonstrated that orthogonal CP coefficients both transmission reflection exceed 0.35 normal incidence of left-handed polarizations (LCP) right-handed (RCP) waves from 6.2GHz to 15GHz, with relative bandwidth about 87.1%. This results conversion efficiency approximately 22%, which approaches theoretical limit (25%) single layer around 8GHz. Moreover, utilizing principle geometrical phase modulation, desired full 2π phase-shift can be achieved solely adjusting orientation angle SSR structure. Numerical substantiate concept demonstrating anomalous refraction, vortex beam generation, planar focusing, showcasing comprehensive control wavefronts all spatial directions. Our design offers valuable insights practical implementation various applications.

Language: Английский

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Design and Verification of a Miniaturized Multifunctional Transmitarray Unit Cell for the S-Band

Journal of Electromagnetic Engineering and Science, Journal Year: 2023, Volume and Issue: 23(6), P. 502 - 511

Published: Nov. 30, 2023

In this paper, a miniaturized multifunctional unit cell structure of transmitarray operating at S-band and its verification method using waveguide is presented. The antenna critical component because it controls the phase polarization an incident wave. proposed consists three main parts: Rx antenna, Tx control circuit for polarization. performance designed verified by rectangular structure. feeds electromagnetic wave propagating in TE₁₀ mode to 1 × 2 array verify shifting capability cell. conversion capabilities are directly measured radiation patterns transmitted

Language: Английский

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Design and Analysis of a Low-Profile Dual-Band Circularly Polarized Monopole Antenna Based on Characteristic Mode Analysis

International Journal of RF and Microwave Computer-Aided Engineering, Journal Year: 2023, Volume and Issue: 2023, P. 1 - 12

Published: Oct. 7, 2023

This paper presents the design of a simple dual-band circularly polarized monopole antenna using characteristic mode analysis. First, elliptically “L”-shaped with partial ground is designed; then, rectangular stub and parasitic structure on plane are implemented to achieve CP operation. To enhance impedance bandwidth generate circular polarization in upper band, attached strip. The employed for simultaneous radiation. Characteristic analysis undertaken predict performance before excitation. modal which excitation shows natural modes that can be excited by response. gives approximate bandwidths achieved even overall dimension $\mathit{\text{is}}0.379{\lambda }_0\times 0.015$ , where id="M2"> corresponding free-space wavelength at 5.7 GHz. measured -10 dB (ZBW) realized 75.9% (4.5 GHz–10 GHz). 3 axial ratio (ARBW) lower bands 6% (5.6 GHz–5.95 GHz) 28% (6.65 GHz–8.82 GHz), respectively. proposed features compact Wi-Fi, WLAN, WiMAX, C band applications.

Language: Английский

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Improved microstrip ring resonator for dielectric response tests and moisture evaluation of oil-impregnated pressboard

Review of Scientific Instruments, Journal Year: 2023, Volume and Issue: 94(10)

Published: Oct. 1, 2023

Moisture ingress is one of the major causes aging in oil-paper insulated transformers; measurement moisture content insulating material thus necessary during transformer disassembly for maintenance. One critical engineering consideration need rapid and nondestructive insulation to minimize power-outage time. Herein, a characterization method based on dielectric response obtained using microstrip petal-like ring resonator (MPRR) proposed. The geometric parameters model were established simulations theoretical analysis. geometry resonant was optimized by modifying originally circular structure (MRR) into structure; this increases number peaks from five seven frequency range 0.5-6.0 GHz same electrode area. effects coupling mode, gap, size resonance characteristics MPRR simulated analyzed. Compared with MRR, has advantages reduced fundamental smaller resonant-ring area that improves radiation efficiency. impact pressboard studied. A moisture-calculation equation measured selected type Lasso regression. results verification experiments show error proposed sufficient practical applications.

Language: Английский

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Reinforcement Learning Controlled Metasurface to Generate False Target Range Profile

IEEE Antennas and Wireless Propagation Letters, Journal Year: 2024, Volume and Issue: 23(9), P. 2573 - 2577

Published: May 13, 2024

This paper designs and simulates an interference metasurface capable of generating range profiles false targets, by manipulating the electromagnetic reflection properties surface through control codes. Deep Deterministic Policy Gradient (DDPG) algorithm is applied to generate multiple sets codes that result in high similarity between produced those real as measured Pearson product moment correlation coefficient (PPMCC). Furthermore, encoded able maintain with targets even when incident wave's azimuthal angle altered, thus achieving dynamic manipulation.

Language: Английский

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Dual-channel multifunctional coding metasurface with integrated focusing and four-beam vortex beams

Physics Letters A, Journal Year: 2024, Volume and Issue: unknown, P. 130186 - 130186

Published: Dec. 1, 2024

Language: Английский

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Modeling of Microwave Antenna Systems

Published: Dec. 24, 2024

Language: Английский

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