Recent Articles
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Impact of 3-D Antenna Radiation Pattern in UAV Air-to-Ground Path Loss Modeling and RSRP-Based Localization in Rural Area
05 October 2023 Sung Joon Maeng, Hyeokjun Kwon, Ozgur Ozdemir and İsmail Güvenç investigate the impact of 3D antenna patterns on a UAV air-to-ground path loss model, utilizing datasets obtained from a measurement campaign. They conducted UAV experiments in a rural area at various fixed heights, while also characterizing the 3D antenna radiation pattern by using an anechoic chamber facility. By analyzing reference signal received power (RSRP) using path loss models that account for antenna patterns, the team observed that the measurement results, obtained at different UAV heights, aligned well with the two-ray path loss model when incorporating the measured antenna pattern.
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Low Sidelobe Pattern Synthesis of Array Antennas With a Triangular or Skew Lattice Using the IFT Method
05 October 2023 Will P. M. N. Keizer describes how the present 2D FFTs, direct and inverse, only applicable for rectangular lattices, can be modified in a simple way to make them suitable for the processing signals arranged along a triangular or skew grid. These two modified FFTs are subsequently implemented in the IFT method. The IFT method, updated in this way, is then very suited for the low sidelobe pattern synthesis of array antennas with a triangular lattice or skew lattice.
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A Global Optimization Method for Wideband and Small Supergain Arrays Design Using Artificial Neural Network
04 October 2023 Abdellah Touhami, Sylvain Collardey and Ala Sharaiha introduce an efficient approach for compact, wideband and supergain arrays design using artificial neural network (ANN) based optimization. The proposed method optimize at the same time the distance inter-elements of the array antenna, its input impedance as well as its directivity. Such global optimization considerably improves the performances of superdirective arrays in terms of gain, bandwidth and efficiency. The proposed method is used afterwards to synthesize a three-elements array using two different unit elements.
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Compact and Broadband Substrate Integrated Dielectric Resonator Antenna Suitable for 5G Millimeter-Wave Communications
27 September 2023 Jie-Er Zhang, Qinfang Zhang, Wei Qin, Wen-Wen Yang and Jian-Xin Chen propose a compact and broadband substrate-integrated dielectric resonator antenna (SIDRA) suitable for 5G millimeter-wave band applications. Four operating modes from three resonators, including TE111 and TE131 modes from the DR, slot mode from the H-shaped feeding slot, and patch mode from the inserted ring patch, are excited to achieve a bandwidth of 61.9% (24-45.5 GHz) with a compact size of 0.37λ0×0.37λ0×0.125λ0.
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Excitation Diversity in Adaptively Thinned Arrays for Microwave Sensing Applications
26 September 2023 Sandra Costanzo and Giovanni Buonanno propose an excitation diversity technique included in thinned arrays design to overcome the unacceptable discrepancy between the actual radiation pattern and the desired one, especially for small to medium-sized arrays, after reducing the complexity of the feeding network. Data distributions achieved with the above approach are averaged to obtain potential high-quality final images. Moreover, the proposed methodology can be easily implemented in real-time adaptive arrays.
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Design of Compact and High Isolation Dual-Polarized Antenna Array via Plasmonic Meta-Structure
20 September 2023 Zhang Wen Cheng, Shimeng Wang, Yue Teng Chen, Ji Ran Chen, Jing Cheng Liang, Feng Gao, Shuai Luan, Xin Liu, Hui Feng Ma and Tie Jun Cui propose a compact and high isolation dual-polarized antenna array based on plasmonic meta-structure operating at 2.58 GHz. The compact principle of the dual-polarized antenna is mainly based on spoof surface plasmon polariton (SSPP) radiation patch to support SSPP modes, which is fed by spatially coupled excitation. The cross-polarization coupling between two polarization ports can be improved to below −32 dB, showing high isolation characteristics.
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A Quad-Polarization and Beam Agile Array Antenna Using Rat-Race Coupler and Switched-Line Phase Shifter
18 September 2023 Maodudul Hasan, Eisuke Nishiyama and Ichihiko Toyoda propose a quad-polarized microstrip array antenna with beam steering capability. The proposed antenna consists of two patch elements, one rat-race coupler, and two 90° switchable phase shifters. With the aid of just four PIN diodes, the two 90° phase shifters can provide four different diode arrangements for each port of the rat-race coupler. The array elements are excited by using orthogonal feed lines. Due to the combination of the rat-race coupler and phase shifters, different phase conditions are generated between the patch elements or orthogonal modes of the patches.
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A Multi-Port Pattern Diversity Antenna With High Isolation
18 September 2023 Nghia Nguyen-Trong and Christophe Fumeaux propose a pattern-diversity antenna with 7 ports for multiple-input multiple-output (MIMO) applications. Orthogonal modes are utilized to achieve high isolation among all 7 ports in a relatively compact shared volume. As distinguishing feature from previous works, the concept of tripolarization is generalized, allowing to design antennas with a large number of orthogonal patterns in a single multi-port device.
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Ultra-Wideband Tightly Coupled Dipole Array Fed by a Tapering Meandered Balun
15 September 2023 Matthew W. Nichols, Michail O. Anastasiadis, Malcolm E. Taaffe, Elias A. Alwan and John L. Volakis present an ultra-wideband (UWB) phased array operating from UHF to C-bands (0.14 to 5.85 GHz). This design employs an integrated, compact tapered spline balun in conjunction with a triple-layer semi-resistive frequency selective surface (FSS) network. Notably, the integration of the meandered balun within a dual-polarized tightly-coupled dipole array (TCDA) allowed for a contiguous bandwidth of 40:1 with VSWR < 2.5 at broadside.
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Synthesis of Symmetric, Two-Element Biomimetic Antenna Arrays Using Singular Value Decomposition
04 September 2023 Son Vu, Saeid Jamilan, Barry D. Van Veen, Hung Luyen and Nader Behdad present a method for determining the four-port S-matrix of the external coupling network (ECN) for symmetric, two-element biomimetic antenna arrays (BMAAs) by employing singular value decomposition (SVD). The presented approach greatly facilitates the synthesis procedure of symmetric, two-element BMAAs and allows all possible scattering matrices of a four-port network realizing the ECN to be easily determined.