IEEE Antennas and Wireless Propagation Letters

The accuracy of free-space complex permittivity measurements relies heavily on system calibration. However, existing calibration techniques often rely on high-precision system hardware or complex calibration procedures, which limit their universality and operational convenience in practical measurement scenarios. This issue is particularly pronounced in the terahertz (THz) band, severely compromi…

This paper proposes a multi-input multi-output (MIMO) high-scanning-rate coupled-resonator antennas at millimeter-wave frequency band for 2-D multi-target localization and heartbeat rate monitoring. The designed coupled-resonator antenna is able to vertically scan beam across a 47<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sup> angular range a…

This paper presents a wideband circularly polarized quadrifilar helix antenna (QHA) featuring simultaneously wide 3-dB axial ratio beamwidth (ARBW) and half-power beamwidth (HPBW), addressing the conventional trade-off between bandwidth and beamwidth. The antenna comprises four pairs of three- stage stepped-impedance folded helical arms, collectively loaded with an arc-shaped metal ring on top. T…

This letter proposes a broadband filtering patch antenna based on quad-mode resonance, exhibiting high out-of-band rejection level and enhanced selectivity. The antenna employs a stacked structure of the driven patch and parasitic patch to achieve dual-mode resonance within the band. By loading C-shaped slots and flag-shaped strips on the driven patch, two additional modes are also generated with…

This letter proposes a kind of 3-D printed patch antenna with compact size and circularly polarized (CP) radiation by using the non-uniform metal or dielectric structure. The conductive filament with low melting point, i.e., Electrifi, and the dual-extruder fused filament fabrication (FFF) process are here utilized to implement the desired metal-dielectric composite structure with high design fre…

This letter presents the design and implementation of an orientation-independent wireless power transfer (WPT) system at 5.8 GHz ISM band, enhanced through integration of a high refractive index (HRI) metasurface (MTS). The transmitter employs a circularly polarized (CP) 2×2 array of diagonally fed rectangular microstrip patches to ensure rotational misalignment tolerance and improved gain. At th…

An accurate circuit model of a two-port square-loop antenna is presented. The circuit consists of equivalent lumped elements based on the Quasi-Static (QS) Partial Element Equivalent Circuit (PEEC) method, under the thin-wire approximation. The introduced model is applied to calculate the transient port response for an impulsive electromagnetic (EM) plane-wave excitation, enabling separate electr…

An ultra-wideband comb-slot-fed symmetrical comb-groove-dielectric resonator antenna (CGDRA) for B5G/6G millimeter-wave (mm-wave) applications is presented in this letter. The proposed CGDRA consists of the comb-slot feeding and the two symmetrical comb-groove-DR (CGDR) elements, which can generate multiple resonance modes for the wideband operation. The sound-fork-shaped microstrip line is adopt…

In this letter, a polarization-dependent, high-gain, wideband transmit-reflect-array (TRA) antenna is presented. The TRA consists of a polarization and frequency selective surface (PFSS) sandwiched between two 3D-printed phase shifting surfaces (PSSs). The PFSS has been designed to allow <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</i>-polari…

This paper presents a flexible, bandwidth-enhanced horizontally polarized omnidirectional antenna addressing key limitations in 5G-enabled Internet of Vehicles (IoV) applications. By integrating a miniaturized meandered Alford loop with discrete coupling patches, the design achieves 28.1% fractional bandwidth, ultra-low profile, and compact size while maintaining flexible capability. The gradient…

Reconfigurable metasurfaces are promising candidates for 6G communications due to their ability to dynamically manipulate electromagnetic (EM) waves. However, conventional 1-bit metasurfaces are fundamentally constrained by binary phase quantization, leading to symmetric radiation patterns under normal incidence and impeding high-gain single-beam generation. Here, we introduce a continuous Pancha…

This letter introduces Neural Scatterer Representation (NeSR), a novel implicit neural representation (INR) framework that resolves the robustness and efficiency issues in the state-of-the-art (SOTA) implicit inverse scattering method. We reveal that the current method suffers from slow convergence and optimization failures in specific scenarios. NeSR overcomes the problems through a more robust …

This letter presents a high-gain compact quadruplex filtering antenna with a small frequency ratio (FR) based on a two-layer substrate integrated waveguide (SIW) structure. The lower-layer feeding section consists of two isosceles right-triangle SIW cavities sharing a common hypotenuse, where independent excitation of the TE<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://w…