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Stacked Rotman Lenses for Dual Band Beamforming

Muhammad Mubasshir Hossain; Stavros Koulouridis; Satheesh Bojja Venkatakrishnan dkk.

IEEE Open Journal of Antennas and Propagation, Vol. 7 No. 1 · 2026 · Inggris · DOAJ Scopus

This article presents a thin planar stacked antenna array for simultaneous dual-band beamforming. The uniqueness of the design is the use of passive beamformers in a compact module with sharp filters to enable beamforming when transmitting at closely spaced frequency bands. It uses two identical…

Editorial: Status Update of OJAP

Zhongxiang Shen

IEEE Open Journal of Antennas and Propagation, Vol. 7 No. 1 · 2026 · Inggris · DOAJ Scopus

Pedestrian Activity Recognition and Prediction With Multi-Dimensional Point Cloud-Based Deep Learning for Millimeter Wave Radar

Zihang Zhou; Shouhei Kidera

IEEE Open Journal of Antennas and Propagation, Vol. 7 No. 4 · 2026 · Inggris · DOAJ Scopus

This study presents a multidimensional point cloud-based pedestrian activity recognition framework for millimeter-wave (mmW) pedestrian collision avoidance sensors. While many existing methods exploit range-velocity-angle data through Fourier-based processing along array or slow-time dimensions…

Single-and Dual-Band RF-Quasi-Reflectionless Planar Monopole Antennas and Their Application to Low-Reflection Antenna Arrays

Runze Li; Li Yang; Zekai Luo dkk.

IEEE Open Journal of Antennas and Propagation, Vol. 7 No. 3 · 2026 · Inggris · DOAJ Scopus

An innovative family of planar monopole radiators with single- and dual-band operational characteristics and RF-quasi-reflectionless functionality is reported. For the single-band case, it consists of a basic reflective-type planar monopole antenna that is loaded at its input terminal by an…

A Dual-Polarization Low-Profile Bifunctional Antenna Integrating Transmitarray and Fabry–Perot Resonator

Xianjiang Zhong; Xiaohang Li; He-Xiu Xu dkk.

IEEE Open Journal of Antennas and Propagation, Vol. 7 No. 3 · 2026 · Inggris · DOAJ Scopus

Attaining highly directive and integrated emissions in an antenna while simultaneously ensuring a slim profile is a challenging task. Here, we propose a novel strategy to design high gain microstrip array with dual functions, which combines the functionalities of transmitarray (TA) and Fabry-Perot…

Wideband Low RCS Circularly Polarized Antenna Array Based on Hybrid Absorptive Frequency Selective Structure

Bingyan Zhou; Di Gao; Binchao Zhang dkk.

IEEE Open Journal of Antennas and Propagation, Vol. 7 No. 3 · 2026 · Inggris · DOAJ Scopus

In this paper, we propose a wideband low radar cross section (RCS) circularly polarized antenna array based on a hybrid absorptive frequency selective structure. To achieve wideband RCS reduction, a two-dimensional absorber and a three-dimensional absorptive frequency selective transmission (AFST)…

Guest Editorial: Introduction to the Special Section on Near-Field Antenna Systems for Communications and Sensing

Manuel Arrebola; Sergio Matos; Alvaro F. Vaquero dkk.

IEEE Open Journal of Antennas and Propagation, Vol. 7 No. 3 · 2026 · Inggris · DOAJ Scopus

A Cost-Effective Liquid-Reconfigurable Reflective Metasurface With an Extended Beam-Scanning Range and a Wide 3-dB Gain Bandwidth Across All Scan Angles

Liang-Yu Ou Yang; Siang-Cyun Liao

IEEE Open Journal of Antennas and Propagation, Vol. 7 No. 3 · 2026 · Inggris · DOAJ Scopus

This paper presents a cost-effective reconfigurable reflective metasurface composed of a saturated aqueous sodium chloride (NaCl) solution, enabling wide-angle beam scanning. The complex dielectric constant of the saturated NaCl solution was measured versus frequency, identifying the 0.4–1.6 GHz…

Multipath Measurement Leveraging In Situ Harmonic Transponders

Jeff Frolik

IEEE Open Journal of Antennas and Propagation, Vol. 7 No. 3 · 2026 · Inggris · DOAJ Scopus

Wireless communication within complex/cluttered environments is prone to multipath fading effects. Channel sounding are measurement techniques used to find data that characterize the extent of any such fading. Channel sounding nominally requires a transmitter at one end of the communication link…

A Superposition Method for Dual-Band Narrow-Wall Shorted-Slotted Waveguide Arrays at 3/4 GHz for Shared-Aperture ISAC Front-Ends

Joko Suryana; Ali Rhomadoni; Lenni Yulianti dkk.

IEEE Open Journal of Antennas and Propagation, Vol. 7 No. 3 · 2026 · Inggris · DOAJ Scopus

This paper presents the design and implementation of a single-fed, dual-band narrow-wall shorted slotted waveguide array (SWA) operating at 3 GHz and 4 GHz within a shared aperture. Rather than treating the dual-band integration only as a geometric coexistence of two resonant slot families, this…

A High-Order Fast Boundary Element Method as a Benchmarking Computational Framework for RCS Analysis of PEC Targets

Omid Babazadeh; Emrah Sever; Ian Jeffrey dkk.

IEEE Open Journal of Antennas and Propagation, Vol. 7 No. 3 · 2026 · Inggris · DOAJ Scopus

A fast and accurate boundary element method framework for benchmarking the Radar Cross Section (RCS) computations for various Perfect Electric Conductor (PEC) targets, including sharp-edge models with electrically large sizes, is proposed. The approach employs a high-order Chebyshev-based Boundary…

Optimal Current Distributions for Antenna Arrays in Radiative Near-Field Communication Links

N. Beschoor Plug; J. Tan; S. Bosma dkk.

IEEE Open Journal of Antennas and Propagation, Vol. 7 No. 3 · 2026 · Inggris · DOAJ Scopus

We present a design methodology for high-capacity line-of-sight communication arrays in the radiative near-field of each other. We optimize the equivalent aperture current distribution of highly directive antennas in order to obtain noise-limited independent data streams with maximal average signal…

High-Order Quad-Band Bandpass FSSs With Multiple TZs for EMI Protection in WPT Scenarios

Runze Li; Li Yang; Shiyan Wang dkk.

IEEE Open Journal of Antennas and Propagation, Vol. 7 No. 3 · 2026 · Inggris · DOAJ Scopus

A class of frequency-selective surfaces (FSSs) with high-order quad-band bandpass filtering response is reported. Its intended application is electromagnetic-interference (EMI) suppression in multiband/ multi-frequency wireless power transmission (WPT) systems. Its basic building FSS element is…

An RF-Switch-Enabled Low-Power Dual-Mode Reconfigurable Reflective Surface

Hang Yu; Edward A. Ball; Rola Saad

IEEE Open Journal of Antennas and Propagation, Vol. 7 No. 3 · 2026 · Inggris · DOAJ Scopus

This paper presents a novel reconfigurable reflective surface capable of selective magnitude control at sub-6 GHz frequencies. Each unit cell integrates a low-power single-pole double-throw (SPDT) RF switch beneath the ground plane, providing two distinct impedance states that govern the reflection…

Compact Dual-Mode CP Antenna With Wide AR Beamwidths for BDS-Based Vehicular Applications

Zhuolin Deng; Jianbin Li; Huanhuan Peng dkk.

IEEE Open Journal of Antennas and Propagation, Vol. 7 No. 3 · 2026 · Inggris · DOAJ Scopus

Reliable vehicular tracking of BeiDou Navigation Satellite System (BDS) satellites requires compact antennas offering circular polarization (CP), dual-band operation, and wide-angle axial-ratio (AR) performance. This paper presents a low-profile single-feed CP antenna that realizes dual-band CP…

Enhancing Axial Ratio Bandwidth and Gain in Microstrip Antennas Through a 3D-Printed Curved Substrate

Giacomo Muntoni; Andrea Melis; Alessandro Fanti dkk.

IEEE Open Journal of Antennas and Propagation, Vol. 7 No. 3 · 2026 · Inggris · DOAJ Scopus

Curved substrates, enabled by additive manufacturing (3D printing), have proven to be a reliable approach for achieving impedance bandwidth enhancement and efficiency improvement in linearly polarized microstrip patch antennas. In this study, a novel application of this concept is instead…

Miniature Scanning Chern Topological Antenna With Eliminated Trivial Photonic-Crystal-Insulator

Ahmed Abdelraheem; Mostafa M. Elesawy; Alex D. Santiago-Vargas dkk.

IEEE Open Journal of Antennas and Propagation, Vol. 7 No. 3 · 2026 · Inggris · DOAJ Scopus

We report the first experimental realization of a Chern periodic topological leaky-wave antenna (LWA). Unlike previous designs, our proposed structure utilizes a quasi-uniform aperture mechanism that completely eliminates the bulky photonic-crystal trivial side and interfaces directly to open space…

Reflectarray 2-D Beam-Steering With Graphene on Copper Elements for 6G Point-to-Point Communication

Suhail Asghar Qureshi; Muhammad Ramlee Kamarudin; Yoshihide Yamada dkk.

IEEE Open Journal of Antennas and Propagation, Vol. 7 No. 3 · 2026 · Inggris · DOAJ Scopus

This work presents a graphene-based Reconfigurable Reflectarray Antenna (RRA) for 6G point-to-point communications. Unlike the conventional dimensions of less than $\lambda $ /8 to act as the main resonant element, Graphene has been designed at $\lambda $ /2 dimensions, which works as the…

Dual Function Metasurface: mm-Wave Radiator and Gain Enhancement Surface for Antenna-on-Chip

Zere Iman; Yiyang Yu; Heng Wang dkk.

IEEE Open Journal of Antennas and Propagation, Vol. 7 No. 3 · 2026 · Inggris · DOAJ Scopus

With the advent of 6G, Antenna-on-Chip (AoC) is becoming more relevant than ever. However, due to the lossy nature of silicon (Si) in standard chip fabrication processes, these antennas suffer from poor gains and radiation efficiencies. An elegant solution is to incorporate an Artificial Magnetic…

Densely Coupled, Super-Realized Gain Printed Dipole Array With Defected Ground Structures

Ihsan Kanbaz; Okan Yurduseven; Michail Matthaiou

IEEE Open Journal of Antennas and Propagation, Vol. 7 No. 3 · 2026 · Inggris · DOAJ Scopus

Super-directive antenna arrays (SDAAs), conventionally designed to achieve exceptional directivity through mutual coupling, face an inherent drawback regarding their high impedance mismatch. Despite their high directivity, the considerable decline in the mismatch efficiency, which is more…