Design of A 2-Bit Dual Linearly Polarized Reconfigurable Reflectarray Element

Wang, Min; Shan, Kunyang; Luo, Wei; Chen, Zhengchuan

doi:10.23919/isap47258.2021.9614474

Cited by 5 publications

(1 citation statement)

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“…Lumped components refer to methods that use actual, physical devices on or in-between surface elements to modify surface currents by manipulating the resistance, impedance, and capacitance. The most common lumped components seen in the literature are RF MEMS, PiN diodes, and varactor diodes [ 61 , 62 , 63 , 64 ]. The literature also shows techniques using combinations of these lumped components [ 65 ].…”

Section: Introductionmentioning

confidence: 99%

A Review of Phase-Change Materials and Their Potential for Reconfigurable Intelligent Surfaces

Matos

Pala

2023

Micromachines

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Phase-change materials (PCMs) and metal-insulator transition (MIT) materials have the unique feature of changing their material phase through external excitations such as conductive heating, optical stimulation, or the application of electric or magnetic fields, which, in turn, results in changes to their electrical and optical properties. This feature can find applications in many fields, particularly in reconfigurable electrical and optical structures. Among these applications, the reconfigurable intelligent surface (RIS) has emerged as a promising platform for both wireless RF applications as well as optical ones. This paper reviews the current, state-of-the-art PCMs within the context of RIS, their material properties, their performance metrics, some applications found in the literature, and how they can impact the future of RIS.

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Section: Introductionmentioning

confidence: 99%

A Review of Phase-Change Materials and Their Potential for Reconfigurable Intelligent Surfaces

Matos

Pala

2023

Micromachines

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VO2-based ultra-reconfigurable intelligent reflective surface for 5G applications

Matos

Pala

2022

Sci Rep

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As demand for higher capacity wireless communications increases, new approaches are needed to improve capacity. The lack of configurable radio platforms and power consumed to create new signals are some of the limitations preventing further advancements. To address these limitations, we propose an Ultra-Reconfigurable Intelligent Surface (URIS) platform based on the metal-to-insulator transition property of VO2. A VO2 layer is placed on a high-density micro-heater matrix consisting of pixels that can be electronically switched on. With this manner of control, heat can be transferred to selected areas of the VO2 layer and convert it to highly conductive metallic phase. This technique allows dynamically changing the shape of the reflection surface with high speed. We numerically investigated the heat activated switching and RF reflection characteristics of a reflectarray designed for potential 5G applications operating at 32 GHz. It consists of heating pixels with the size of 40 × 40 μm which can generate metallic VO2 patches or arbitrary shapes with ~ 100 × 100 μm spatial resolution. Our analyses resulted in large phase range of ~ 300° and approximate losses of −2 dB. The proposed device can serve as a novel platform for ultra-reconfigurable reflectarrays, other IRSs, and various wide spectral range RF applications.

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