Recent Articles
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Gain Improvement of a Low-Profile Horizontally Polarized Omnidirectional Antenna Using a Parasitic Loop
26 January 2026 Xiaohan Zhai, Lei Zhu and Jiaxin Kuang present a low-profile horizontally polarized omnidirectional (HPO) antenna that achieves gain enhancement without increasing its height. The key innovation lies in introducing a parasitic large loop around the primary loop antenna. By carefully controlling the amplitude and phase relationship of the currents in both loops, their radiation patterns cancel each other in undesired directions while maintaining the maximum radiation direction in the azimuth plane, effectively narrowing the main beam and improving directivity.
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A Hybrid Numerical-Analytical Approach for Scalable Metasurface Design in Focused Long-Range Wireless Power Delivery
26 January 2026 Pierpaolo Usai, Martina Falchi, Danilo Brizi and Agostino Monorchio present a low-frequency metasurface that generates a highly focused magnetic field when excited by an actively fed transmitting coil for long-range resonant inductive wireless power transfer. A theoretical framework based on magnetic dipole theory is derived to calculate the optimal currents required to shape the magnetic field into a confined hotspot at a target working distance. The optimization process maximizes the correlation between the desired field distribution and the combined contributions of the metasurface and transmitter.
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A Divide-and-Conquer Tiling Method for the Design of Large Aperiodic Phased Arrays
20 January 2026 Nicola Anselmi, Paolo Rocca, Giovanni Toso and Andrea Massa propose an innovative irregular tiling method where, according to a divide-and-conquer strategy, the antenna aperture is subdivided into sub-areas that are locally domino-tiled by jointly fulfilling the full-coverage condition on the remaining untiled part of the PA support. Selected representative results, including comparisons with competitive state-of-the-art synthesis methods, are reported to prove the effectiveness and the computational scalability for large PAs of the proposed tiling approach.
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A Combined Image Theory-Scattering Matrix Method for PEC Dihedral Geometries
19 January 2026 Renat Abdullin, Tommaso Isernia, Giada M. Battaglia, Lorenzo Crocco, Andrea F. Morabito and Roberta Palmeri present a method for analyzing electromagnetic wave scattering from a set of objects located within a dihedral corner. The study focuses on the 2-D case and considers scatterers modeled as dielectric and/or perfectly conducting cylinders with arbitrary cross-sections. These cylinders are aligned parallel to each other and to the walls of the dihedral corner, which is formed by two perfectly conducting planes intersecting at an angle Δ=π/N , with N being any natural number. The proposed approach is based on the image theory and enables efficient and accurate computation of the scattered fields.
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Adaptive Sampling for Spherical Near-Field Antenna Measurements via Uncertainty-Driven Gaussian Process Regression
14 January 2026 Kitiphon Sukpreecha, Kittisak Phaebua, Titipong Lertwiriyaprapa, Danai Torrungrueng and Hsi-Tseng Chou propose an adaptive sampling technique for spherical near-field (SNF) antenna measurements that leverages the predictive uncertainty of Gaussian process regression (GPR) to guide measurement point selection. This framework bridges Bayesian machine learning and antenna metrology, enabling real-time adaptive sampling. Unlike conventional uniform or clustering-based methods, the proposed approach iteratively refines the sampling grid by prioritizing regions with high uncertainty, particularly within the high-intensity near-field or other defined regions of interest.
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Cell-Based Domain Decomposition for Metasurface Antennas Design
12 January 2026 Leonardo Pollini, Marcello Zucchi and Giuseppe Vecchi investigate on the impact of the discretization of the optimization domain, and its decomposition to conform to the actual size of the unit-cells in the context of a deterministic current-based optimization method. It is shown that information on the unit-cell size can guarantee better agreement between the resulting IBC and the actual realization with physical unit-cells. Also, optimization convergence is notably faster.
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Millimeter Wave Radar-Based Survivor Detection and Localization in Indoor Rescue Scenarios
12 January 2026 Toshiki Tateoka and Shouhei Kidera introduce a survivor recognition and localization approach that leverages the temporal characteristics of complex-valued radar images and features obtained using millimeter-wave (MMW) sensors in assumed considerably optically blurred situations in indoor rescue scenarios, such as in firefighting. To address the challenges in localizing and detecting static survivors in low postures, we incorporate radar imaging and deep learning schemes to obtain temporal changes in complex-valued radar images to extract human-originated signs, such as respiration, heartbeat, and millimeter-scale trembling.
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Miniaturized Clover-Shaped Patch Antenna With Improved Phase Center Variation and Circular Polarization for GNSS Positioning Applications
12 January 2026 Gonçalo Dores, Hugo Dinis and Paulo M. Mendes presents a new miniaturized patch antenna design for GNSS applications with low phase center variation and high circular polarization purity. The phase center variation values of this antenna enable positioning performance to be equal when compared to bigger state of the art commercial antennas. It is found that the circular features as well as a small asymmetry caused by circular slot pairs, perpendicular to each other, can generate the wanted circular polarization results while maintaining the antenna compact.
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Radar Bistatic Technique for Accurate Characterization of Small Antenna Radiation Patterns
25 December 2025 Habiba Hafdallah Ouslimani, Patricia Grassin-Lezé and Kevin Claver propose an original method based on the radar bistatic technique (RBTech) to characterize key antenna parameters, with emphasis on radiation patterns. The bistatic configuration comprises two standard transmit/receive antennas, and the antenna under test. While the transmitting Tx antenna remains fixed, in front of the target (at normal incidence), the receiving Rx antenna rotates around with a bistatic angle. Rx measures the diffracted wave (i.e., backscattered field) as a function of the frequency, the wave polarization and the bistatic angle, for different terminal impedance; namely short-circuit, open circuit, and matched load.
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Polarization Controlled Dual-Polarized MIMO Antenna With Enhanced Isolation for Full-Duplex WBANs
25 December 2025 Ajeet Thakur, Ashwani Sharma and Ignacio Julio Garcia Zuazola propose a polarization controlled dual-polarized multiple-input multiple-output (MIMO) antenna with enhanced isolation for full-duplex wireless body area network (WBAN) in the 5.8 GHz industrial, scientific, and medical (ISM) band. The advanced polarization control of each antenna element comprising the MIMO antenna is realized by embedding tailored T-shaped strips within the transversal slots of a main diagonal cut in the ground plane, which effectively steer the surface currents to a favorable direction to achieve the desired polarization with enhanced isolation.
