Indoor wireless signal coverage and enhancement based on passive reconfigurable intelligent metasurface by Haixia LIU, Hao YI, Xiangjin MA, Shuyao YUE, Xudong KONG, Pei MA, Yuxin ZENG, Long LI

“…Reconfigurable intelligent metasurface (RIS) is a new type of artificial electromagnetic metamaterial, which can control the frequency, amplitude, phase, polarization, propagation direction and wave type of electromagnetic wave flexibly.In the field of wireless communication, RIS can be used to reconstruct the wireless communication channel to achieve blind coverage of wireless signals and improve the communication quality.First, the development and research status of RIS, the key technologies and application scenarios of RIS were summarized and analyzed.Then, a new passive RIS was proposed to realize the characteristics of the aperture reconfiguration and beam reconfiguration through passive coding and splicing principle, which had the advantages of low cost, low power consumption and low complexity.Finally, the blind area coverage enhancement experiment of indoor wireless signal based on passive reflection metasurface was carried out.The effectiveness of passive splicing metasurface in wireless communication blind coverage scenarios was proved by comparison between simulation and field measurement.In addition, for 5G/6G millimeter wave communication, the passive RIS with double-layer cross dipole elements was designed and applied to typical indoor L-shaped corridor scene to verify the enhancement effect of indoor wireless signal coverage.…”
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Analysis of a D-Shaped Photonic Crystal Fiber Sensor with Multiple Conducting Layers by Amanda F. Romeiro, Markos P. Cardoso, Caua C. Miranda, Anderson O. Silva, João C. W. A. Costa, M. Thereza R. Giraldi, Jose L. Santos, Jose M. Baptista, Ariel Guerreiro

“…We explored four distinct plasmonic materials-silver (Ag), gold (Au), Ga-doped zinc oxide (GZO), and an Ag-nanowire metamaterial-to understand their impact on sensor performance. …”
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Hybrid Dyakonov Surface Waves at Uniaxial Crystal-Temperature-Sensitive Material Interfaces by Tahseen Sana, Majeed A. S. Alkanhal, Ahtisham Ali, Hafeez Ullah, Abdul Ghaffar, Yasin Khan, Muhammad Zeshan Yaqoob

“…The uniaxial crystal is realized as a metamaterial having a direction-dependent permittivity tensor, with the optical axis (OA) parallel to the interface. …”
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Innovative Radiating Systems for Train Localization in Interference Conditions by C. Vegni, M. Tosti, A. M. Vegni

“…The design of innovative radiating systems based on the metamaterial technology for GNSS (Global Navigation Satellite System) applications in radio frequency (RF) interference conditions is proposed. …”
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Compact Quadband Bandstop Filter Based on Concentric Split Ring Resonators with Perturbation for Multifunctional Wireless Systems by Pierre Moukala Mpele

“…The desired performance is achieved by introducing two diamond-shaped concentric split ring resonators (DSCSRRs) intercoupled and defected ground structure. The metamaterial properties of the DSCSRR have been verified by extracting and analyzing its effective permittivity and permeability. …”
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Phase Reversal Technique Applied to Fishnet Metalenses by Victor Pacheco-Peña, Igor V. Minin, Oleg V. Minin, Miguel Beruete

“…In this work, the fishnet metamaterial is applied to several converging metalenses by combining the zoning, reference phase, and phase reversal techniques. …”
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Study on Millimeter-Wave Vivaldi Rectenna and Arrays with High Conversion Efficiency by Guan-Nan Tan, Xue-Xia Yang, Huan Mei, Zhong-Liang Lu

“…The receiving Vivaldi antenna loaded with metamaterial units has a high gain of 10.4 dBi at 35 GHz. …”
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MICROSTRUCTURE DESIGN AND MECHANICAL PROPERTIES ANALYSIS OF POROUS BONE WITH NEGATIVE POISSION’S RATIO (MT) by YE JianHua, LI DongYu, LIN Jia, ZENG ShouJin, WEI TiePing, XU MingSan

“…In view of the large difference between the elastic modulus of human bone structure and metal materials and the difficulty of control, the goal is to reduce or eliminate the “stress shielding” effect in a wide span, introduce a negative Poisson’s ratio metamaterial with an unconventional deformation mechanism, carry out the design and experimental research of porous microstructure with wide span and low elastic modulus. …”
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Introduction to the January 2025 Issue by Peter H. Siegel

“…Our January issue content includes 19 regular papers spanning topics that include wearable smart skins, batteryless IoT devices, astronaut hand gesture recognition, THz chiral structures, and metamaterial transmitarrays. We also bring you more than our usual quantity of the more core microwave filter, transmission line, antennas, and waveguide component papers, and a couple of papers on radar instruments and techniques.…”
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Vibration Mitigation in the Transport of Fruit Boxes Using 3D-Printed Devices by Pedro Sanchez-Cachinero, Cristina Aguilar-Porro, Rafael R. Sola-Guirado

“…., the transport boxes. In this context, metamaterial sheets inspired by the design of quasi-zero stiffness isolators (QZSs) open up the possibility of exploring ways of vibration isolation thanks to their associated nonlinear characteristics. …”
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High-Gain SIR Dual-Band Antenna Based on CSRR-Enhanced SIW for 2.4/5.2/5.8 GHz WLAN by Caixia Feng, Yongqiang Kang, Lijuan Dong, Lihong Wang

“…This paper presents a dual-band step impedance resonator (SIR) antenna based on metamaterial-inspired periodic structure of coupled complementary split-ring resonators substrate-integrated waveguide (CSRR-SIW). …”
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