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2026-04-03 Latest Published

A High-Selectivity 3-D Dual-Polarized Frequency Selective Rasorber with Wide Absorption Bands Based on Multiple Strip-Type Resonators
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By Hao Shen Borui Bian Dan Zhang

Progress In Electromagnetics Research Letters, Vol. 130, 15-22, 2026

doi:10.2528/PIERL26021202 | Google Scholar

Abstract

This letter presents a high-selectivity three-dimensional (3-D) dual-polarized frequency-selective rasorber (FSR). The proposed design comprises a 3-D array of multiple lossy strip-type resonators integrated with a planar bandpass frequency-selective surface (FSS). While the multiple resonances of the strips provide wideband absorption, a parallel LC structure is loaded within each resonator to achieve a low-loss transmission band. Numerical and experimental results demonstrate an ultra-wide low-reflection band with a fractional bandwidth (FBW) of 162.2% from 2.0 to 19.2 GHz. This includes a transmission band at 10 GHz with an insertion loss of 0.47 dB, alongside a lower frequency absorption band (2.0-9.5 GHz, FBW 130.4%) and an upper frequency absorption band (10.5-19.2 GHz, FBW 58.6%). The operating mechanism is further validated by an equivalent circuit model and measurement of a fabricated prototype, showing good agreement between theory and experiment.

2026-04-03

PIER Letters

Vol. 130, 15-22, 2026

doi:10.2528/PIERL26021202

download: 8

A High-Selectivity 3-D Dual-Polarized Frequency Selective Rasorber with Wide Absorption Bands Based on Multiple Strip-Type Resonators

Hao Shen, Borui Bian and Dan Zhang

2026-03-24

PIER Letters

Vol. 130, 9-14, 2026

doi:10.2528/PIERL25072504

download: 113

Design of a Tunable Wide-Stopband Plasmonic Filter Based on a Metal-Insulator-Metal (MIM) Waveguide for Mid-Infrared Applications

Ahmed Lounis, Imane Zegaar, Hocine Bensalah and Abdesselam Hocini

Wide-stopband plasmonic filters are essential components in compact mid-infrared (MIR) photonic systems. This work proposes a geometrically tunable wide-stopband plasmonic filter based on a metal-insulator-metal (MIM) waveguide with dual resonator cavities. The optical response is numerically investigated using the two-dimensional finite-difference time-domain (2D FDTD) method. The influence of the resonator height H₂ and the inter-cavity distance D on the stopband characteristics is analyzed. The symmetric dual-cavity configuration enables effective control of the stopband bandwidth and central wavelength. The design achieves a significantly broadened stopband while maintaining compactness and high transmission selectivity, making it a promising candidate for integration into mid-infrared photonic and sensing systems.

Design of a Tunable Wide-stopband Plasmonic Filter Based on a Metal-Insulator-Metal (MIM) Waveguide for Mid-infrared Applications

2026-03-18

PIER Letters

Vol. 130, 1-8, 2026

doi:10.2528/PIERL26010302

download: 136

Design and Experimental Validation of Linear to Circular Polarization Converter for Point to Point THz Communication

Murtaza Waheed, Javid Ahmad Ganie, Mingyan Zhong, Qusay Raghib Al-Taai, Kushmanda Saurav and Chong Li

This letter presents a compact, low profile singe substrate transmissive linear-to-circular polarization (LCP) converter designed and experimentally validated for point-to-point THz communication bands. The proposed LCP converter consists of an H-shaped gold metallic pattern deposited on both sides of a 100 μm-thick fused silica substrate. The LCP converter operates within the 0.225-0.307 THz frequency band, achieving a simulated 3-dB axial ratio bandwidth of 30.8% in simulation. Owing to its wide axial ratio bandwidth, the proposed design is a promising candidate for point-to-point THz communication applications. The performance of the proposed converter is verified through surface current distribution, which explains the occurrence of Huygens response and equivalent circuit model. The proposed converter exhibits a measured 3-dB axial-ratio bandwidth of 27.8% in the frequency band 0.229-0.303 THz. The simple geometry and single-substrate implementation, with a thin profile and wide 3-dB axial ratio bandwidth, make the proposed design suitable for practical deployment scenarios.