PIER M | PIER Journals

2026-07-27 Latest Published

Modulation of Electromagnetic Wave Physical Characteristics by Strongly Anisotropic Acoustic Metamaterials
Download Full Article View Full Article

By Zhanying Guo Hui Li Yang An

Progress In Electromagnetics Research M, Vol. 139, 21-35, 2026

doi:10.2528/PIERM26031803 | Google Scholar

Abstract

Objective: This study aims to experimentally and numerically investigate the modulation of electromagnetic wave physical characteristics (transmittance, absorptance, impedance) by strongly an isotropic acoustic materialism in the 2-12 GHz frequency band, and to quantify the influence of material parameters (thickness, density, elastic modulus, an isotropic direction) on wave control performance. Methods: Three types of material units (metal composite, polymer, ceramic reinforced) with thicknesses of 1.5-3 mm and anisotropic directions along X, Y, Z axes were fabricated. Transmittance and absorbance were measured using a vector network analyzer with a WR-90 guideway system. Finite element simulations incorporating acoustic-electromagnetic coupling (strain-induced permittivity modulation) were conducted. Sensitivity analysis was performed by varying thickness (±10%), elastic modulus (±5 GPa), density (±500 kg/m³), and direction angle (±15°). Results: High-frequency absorbance reached 0.91 (metal composite at 9.5 GHz), while low-frequency transmittance remained above 0.70. Thickness and elastic modulus predominantly affected the amplitude and position of high-frequency absorption peaks, whereas density and direction angle primarily regulated low-frequency response, resulting in multi-peak broadband absorption. The deviation between experimental data and finite element simulation was less than 3%. Sensitivity analysis revealed that thickness (±10%) and elastic modulus (±5 GPa) produced the most significant changes in transmittance (0.60-0.91) and absorptance (0.70-0.91). Conclusion: Strongly an isotropic acoustic materialism offer mechanically t unable electromagnetic wave control, with thickness and elastic modulus as key design parameters. These findings provide experimental and theoretical references for high-frequency communication antennas, radar stealth coatings, and broadband absorption devices.

2026-07-27

PIER M

Vol. 139, 21-35, 2026

doi:10.2528/PIERM26031803

download: 6

Modulation of Electromagnetic Wave Physical Characteristics by Strongly Anisotropic Acoustic Metamaterials

Zhanying Guo, Hui Li and Yang An

2026-07-20

PIER M

Vol. 139, 11-20, 2026

doi:10.2528/PIERM26050607

download: 64

Using Reverberation Chambers as Test Environments for mmWave Wireless Systems

Alfredo De Leo, Luca Bastianelli, Valter Mariani Primiani, Davide Micheli, Renzo Lattanzi, Pietro Obino, Max Moccia, Thirumaran Muthiah, Riccardo Diamanti and Franco Moglie

This study presents millimeter-wave propagation measurements at 60 GHz conducted in a reverberation chamber to emulate realistic multipath-rich indoor environments. Both line-of-sight (LOS) and non-line-of-sight (NLOS) scenarios are investigated using commercial off-the-shelf devices. The impact of stirring conditions and lossy environments is evaluated through key performance indicators, including Received Signal Strength Indicator (RSSI), Signal-to-Noise Ratio (SNR), Modulation and Coding Scheme (MCS), and throughput. Results show that mechanical stirring speed and the placement of absorbing materials significantly affect channel characteristics and system performance. In NLOS conditions, multipath propagation dominates, where dynamic beamforming demonstrates improved robustness. In contrast, LOS scenarios are highly sensitive to blockage, leading to notable performance degradation. Overall, the findings confirm that the reverberation chamber is an effective platform for over-the-air testing and characterization of 60 GHz wireless systems, offering valuable insights into system behavior under complex indoor propagation conditions relevant to future 5G and 6G deployments.

Using Reverberation Chambers as Test Environments for mmWave Wireless Systems

2026-07-09

PIER M

Vol. 139, 1-10, 2026

doi:10.2528/PIERM26050602

download: 100

A Miniaturized Circularly Polarized Antenna with Embedded Metasurface Patches

Xu Tan, Han Lin, Zhonggen Wang and Wenyan Nie

This study proposes a high-performance miniaturized wideband circularly polarized (CP) metasurface (MTS) antenna for WLAN and 5 GHz wireless communication systems. The design innovatively utilizes a hybrid embedded structure, where regular octagonal patches are incorporated into the gaps of modified X-shaped primary radiating elements to increase edge capacitance and lower resonant frequency, thereby achieving antenna miniaturization. To effectively excite the orthogonal degenerate modes required for CP radiation, a characteristic mode analysis (CMA) was employed to guide the design of the feed network. A feeding structure consisting of a hook-shaped microstrip line and a symmetrical stepped cross-slot is designed to achieve CP excitation via a 90˚ phase delay introduced by path length differences. Measured results demonstrate that the antenna achieves a -10 dB impedance bandwidth of 34.2% (4.38-6.19 GHz) and a 3 dB axial ratio (AR) bandwidth of 23.9% (4.68-5.95 GHz). Regarding radiation characteristics, the radiation efficiency remained stable above 75%, and the peak realized gain reached 5.26 dBic. The experimental results verified that the proposed design achieved stable CP and radiation performance within a miniaturized footprint.