Microwave Polymer Dispersed Liquid Crystal Loaded Variable Phase Shifter

Kamei, Takeshi; Dinh, Nguyen Quoc; Utsumi, Yozo

doi:10.1080/15421400701732589

Cited by 6 publications

(7 citation statements)

References 4 publications

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Section: Performance Improvement Via Lc Technologymentioning

confidence: 99%

“…[83] Kamei et al also showed the decay time can be reduced to ≈1/30 times that of a conventional LC device by using PDLC mixtures (Figure 9d). [79] Guirado et al applied polymer network to the reconfigurable intelligent surfaces (RIS) for improving the response time for the first time. [80] The investigation of RIS in the context of 5G/6G communication technology has emerged as a compelling and highly researched topic, capturing significant attention from scholars and industry experts alike.…”

Section: Lc/polymer Composite For Response Time Improvementmentioning

confidence: 99%

mentioning

confidence: 99%

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Liquid Crystals for Advanced Smart Devices with Microwave and Millimeter‐Wave Applications: Recent Progress for Next‐Generation Communications

Choi

Park

et al. 2023

Advanced Materials

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Liquid crystals (LCs) technology have a well‐established history of applications in visible light, particularly in the display industry. However, with the rapid growth in communication technology, LCs have become a topic of current interest for high‐frequency microwave (MW) and millimeter‐wave (mmWave) applications due to promising characteristics such as tunability, continuous tuning, low losses, and price compatibility. To improve the performance of future communication technology using LCs, it is not sufficient only with the perspective of radio‐frequency (RF) technology. Therefore, it is imperative to understand not only the novel structural designs and optimization of MW engineering but also the perspective of materials engineering when implementing advanced RF devices with maximum performance for next‐generation satellite and terrestrial communication. Herein, based on advanced nematic LCs, polymer‐modified LCs, dual‐frequency LCs, and photo‐reactive LCs, this article summarizes and examines the modulation principles and key research directions for the design strategies of LCs for advanced smart RF devices with improved driving performance and novel functionality. Furthermore, the challenges in development of state‐of‐the‐art smart RF devices that use LCs are discussed.

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Section: Performance Improvement Via Lc Technologymentioning

confidence: 99%

Section: Lc/polymer Composite For Response Time Improvementmentioning

confidence: 99%

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Liquid Crystals for Advanced Smart Devices with Microwave and Millimeter‐Wave Applications: Recent Progress for Next‐Generation Communications

Choi

Park

et al. 2023

Advanced Materials

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“…Reproduced with permission. [ 79 ] Copyright 2007, published by Taylor & Francis Group, LLC. e) Schematics of transmissive and reflective RIS cells with LC/polymer composite for improving the response time.…”

Section: Figurementioning

confidence: 99%

Liquid Crystals for Advanced Smart Devices with Microwave and Millimeter‐Wave Applications: Recent Progress for Next‐Generation Communications

Ma,

Choi,

Park

et al. 2023

Advanced Materials

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“…If the liquid crystal molecules inside the PDLC matrix can be pre-aligned 90 degrees from the field direction, the effective index change could be greatly improved. The pre-alignment of liquid crystals can be achieved by creating an alignment layer similar to the regular alignment layer for liquid crystal [57] ( Figure 43). …”

Section: Improvementsmentioning

confidence: 99%

Tunable terahertz fishnet metamaterial

Chang¹,

Wang²,

Lin³

et al. 2013

Applied Physics Letters

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A tunable fishnet metamaterial (TFMM) was designed and fabricated to prove its potential in controlling terahertz radiation (0.1 THz~10THz). A model to retrieve refractive index of single layer fishnet metamaterial (SLFM) was developed and applied to study the tunable frequency range of TFMM. Reference planes that define the material boundaries of SLFM and multilayer fishnet metamaterial (MLFM) were investigated to show that the material property of fishnet metamaterial is a function of layers. The issue of applying current model to MLFM was discussed.The TFMM infiltrated with a voltage-controllable polymer dispersed liquid crystal (PDLC) was fabricated and tested by terahertz time domain spectroscopy (THz-TDS). An encapsulating technique that covers PDLC with a polyimide layer (skin layer) was applied to prevent volatile liquid crystal from escaping the PDLC and enable the deposition of metal layer. Concept of tuning TFMM infiltrated with PDLC (PDLC-TFMM) was proven by measuring the frequency shift in the reflection coefficient. The negative refractive index of PDLC-TFMM was achieved. The reliability issue of current PDLC-TFMM was discussed.II

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Microwave Polymer Dispersed Liquid Crystal Loaded Variable Phase Shifter

Cited by 6 publications

References 4 publications

Liquid Crystals for Advanced Smart Devices with Microwave and Millimeter‐Wave Applications: Recent Progress for Next‐Generation Communications

Liquid Crystals for Advanced Smart Devices with Microwave and Millimeter‐Wave Applications: Recent Progress for Next‐Generation Communications

Liquid Crystals for Advanced Smart Devices with Microwave and Millimeter‐Wave Applications: Recent Progress for Next‐Generation Communications

Tunable terahertz fishnet metamaterial

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