IEEE Open Journal of Antennas and Propagation最新文献_第3页

Far-Field Characterization of High-Gain Antennas at 300-GHz Band Based on a Photonics-Based Near-Field Measurement 基于光子近场测量的300 ghz高增益天线远场特性研究

IF 3.4

IEEE Open Journal of Antennas and Propagation Pub Date : 2026-08-01 Epub Date: 2026-04-27 DOI: 10.1109/OJAP.2026.3687402

Yusuke Tanaka;Kento Ishihara;Kota Miyake;Keizo Inagaki;Shintaro Hisatake

{"title":"Far-Field Characterization of High-Gain Antennas at 300-GHz Band Based on a Photonics-Based Near-Field Measurement","authors":"Yusuke Tanaka;Kento Ishihara;Kota Miyake;Keizo Inagaki;Shintaro Hisatake","doi":"10.1109/OJAP.2026.3687402","DOIUrl":"https://doi.org/10.1109/OJAP.2026.3687402","url":null,"abstract":"This paper presents a photonics-based near-field measurement approach for characterizing far-field radiation patterns of high-gain antennas operating at 300-GHz. Utilizing an electro-optic (EO) probe for electric near-field sensing, the system enables stable and precise acquisition of amplitude and phase over long measurement durations, which is essential for evaluating antennas with nominal gains exceeding 40 dBi. Far-field patterns reconstructed from near-field data using cylindrical mode expansion showed excellent agreement with direct far-field measurements conducted at an outdoor site with an antenna separation of 53 m. This result confirms that tabletop photonics-based near-field systems can serve as practical alternatives to outdoor far-field ranges at sub-terahertz frequencies. Quantitative evaluation using the equivalent noise level (ENL) metric demonstrated high pattern fidelity, with average ENL values below −35 dB within the −10 dB beamwidth region. Fine structural features, including low-level sidelobes, were also accurately reproduced. Comparisons with the ITU-R F.699-8 reference radiation pattern revealed narrower predicted beamwidths and underestimated sidelobe levels, likely due to model limitations and radome effects, suggesting the need for updates above 86 GHz. The proposed method offers a scalable and practical solution for antenna metrology in frequency regimes where conventional direct far-field measurements and CATR systems face significant implementation challenges.","PeriodicalId":34267,"journal":{"name":"IEEE Open Journal of Antennas and Propagation","volume":"7 4","pages":"1189-1199"},"PeriodicalIF":3.4,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11494828","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148675696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

IEEE Open Journal of Antennas and Propagation Publication Information IEEE天线与传播公开杂志出版信息

IF 3.4

IEEE Open Journal of Antennas and Propagation Pub Date : 2026-08-01 Epub Date: 2026-08-06 DOI: 10.1109/OJAP.2026.3712429

引用次数: 0

Additively Manufactured Waveguide Orthomode Transducer in the K-Band for Dual-Circular Polarization Broadband Satellite Antennas 用于双圆极化宽带卫星天线的k波段增材波导正交换能器

IF 3.4

IEEE Open Journal of Antennas and Propagation Pub Date : 2026-08-01 Epub Date: 2026-04-09 DOI: 10.1109/OJAP.2026.3682156

José Rico-Fernández;Guillermo Menéndez;Manuel Arrebola;Nelson J. G. Fonseca

{"title":"Additively Manufactured Waveguide Orthomode Transducer in the K-Band for Dual-Circular Polarization Broadband Satellite Antennas","authors":"José Rico-Fernández;Guillermo Menéndez;Manuel Arrebola;Nelson J. G. Fonseca","doi":"10.1109/OJAP.2026.3682156","DOIUrl":"https://doi.org/10.1109/OJAP.2026.3682156","url":null,"abstract":"Two compact orthomode transducers (OMTs), one providing dual-linear polarization and one providing dual-circular polarization, are presented for broadband K-band satellite communication antennas over 17.7–20.2 GHz. The contribution of this work is not limited to the use of Laser Powder Bed Fusion (LPBF) additive manufacturing, but lies in the co-design-for-manufacturing adaptation of compact waveguide OMT architectures to enable monolithic metallic realization under LPBF constraints. In the dual-linear case, a previously reported compact two-probe concept is re-designed with additive-manufacturing-compatible matching and enclosure features. In the dual-circular case, a Riblet-coupler-based architecture is integrated with the compact OMT concept and adapted to LPBF manufacturing through geometry modifications compatible with overhang, wall-thickness, and printing-orientation limitations. For experimental validation, both OMTs are manufactured in AlSi10Mg and tested using transitions to WR42 waveguide and a conical horn antenna. Measured results show return loss and port-to-port isolation better than 25.2 dB and 18.1 dB for the dual-linear OMT, and 22.4 dB and 23.8 dB for the dual-circular OMT, in good agreement with simulations. The demonstrated combination of electromagnetic design and LPBF-oriented mechanical adaptation is of interest for compact, lightweight, and monolithic dual-polarized waveguide components and array antennas in the millimeter-wave band.","PeriodicalId":34267,"journal":{"name":"IEEE Open Journal of Antennas and Propagation","volume":"7 4","pages":"1167-1175"},"PeriodicalIF":3.4,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11478448","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148676001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cross-Polarization Reduction of a Compact Broadband Printed Log-Periodic Dipole Array Antenna Using Symmetric Coplanar Dipoles 利用对称共面偶极子减少紧凑宽带印刷对数周期偶极子阵列天线的交叉极化

IF 3.4

IEEE Open Journal of Antennas and Propagation Pub Date : 2026-08-01 Epub Date: 2026-04-28 DOI: 10.1109/OJAP.2026.3688519

M. H. Gharavi;Masoud Edalatipour;Hui Deng

{"title":"Cross-Polarization Reduction of a Compact Broadband Printed Log-Periodic Dipole Array Antenna Using Symmetric Coplanar Dipoles","authors":"M. H. Gharavi;Masoud Edalatipour;Hui Deng","doi":"10.1109/OJAP.2026.3688519","DOIUrl":"https://doi.org/10.1109/OJAP.2026.3688519","url":null,"abstract":"Printed log-periodic dipole array (PLPDA) antennas often exhibit significant cross-polarization, which limits their use in array configurations. This article introduces a simplified technique to address this drawback using a new symmetric coplanar dipole array structure. In the proposed antenna, cross-polarization reduction is achieved by increasing the symmetry of both the dipole array and the feeding network. Theoretical evaluation and characteristic mode analysis are conducted to provide fundamental insight into how enhanced symmetry in a printed dipole reduces cross-polarization compared with an asymmetric design. A conventional PLPDA with a traditional dipole array structure was designed to serve as the baseline for the proposed antenna and is used for a fair comparison. To validate the theoretical analysis and rigorous full-wave simulations, prototypes of both antennas were fabricated and measured. The measured results show that the proposed antenna not only achieves a symmetric radiation pattern, with a cross-polarized radiation level below −34 dB and a front-to-back ratio above 20 dB across the 1.9–6.2 GHz operating band, but also maintains a stable gain of <inline-formula> <tex-math>$6.8~pm ~1$ </tex-math></inline-formula> dBi without gain anomalies. Furthermore, compared with the conventional PLPDA, the proposed antenna achieves a wider fractional bandwidth of 106.2% (an increase of 11.2%), with an 8 dB reduction in cross-polarized radiation level and a 6 dB improvement in front-to-back ratio.","PeriodicalId":34267,"journal":{"name":"IEEE Open Journal of Antennas and Propagation","volume":"7 4","pages":"1225-1231"},"PeriodicalIF":3.4,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11498356","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148675829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Dual-Polarized Fully-Planar Inverted-L Element (DP-FILE) Array 一种双极化全平面倒l元（DP-FILE）阵列

IF 3.4

IEEE Open Journal of Antennas and Propagation Pub Date : 2026-08-01 Epub Date: 2026-03-22 DOI: 10.1109/OJAP.2026.3696211

Christos Exadaktylos;Muhammad Hamza;Constantinos L. Zekios;Stavros V. Georgakopoulos

引用次数: 0

Learning to Twin Wireless Channels: Conditional Synthesis for UAV-to-Vehicle Communication 学习双无线信道：无人机对车辆通信的条件合成

IF 3.4

IEEE Open Journal of Antennas and Propagation Pub Date : 2026-08-01 Epub Date: 2026-04-28 DOI: 10.1109/OJAP.2026.3687874

Rui Liu;Lei Xiong;Dan Fei;Cheng Li;Liang Shen;Xiangbing Tan

{"title":"Learning to Twin Wireless Channels: Conditional Synthesis for UAV-to-Vehicle Communication","authors":"Rui Liu;Lei Xiong;Dan Fei;Cheng Li;Liang Shen;Xiangbing Tan","doi":"10.1109/OJAP.2026.3687874","DOIUrl":"https://doi.org/10.1109/OJAP.2026.3687874","url":null,"abstract":"Accurate channel impulse response (CIR) data is critical for developing and optimizing unmanned aerial vehicle (UAV)-to-vehicle communication systems. However, acquiring sufficient measurements in the real world is often costly and time-consuming. This paper presents ChannelWGAN, a novel digital twin (DT)-enabled framework for high-fidelity CIR generation using a conditional generative adversarial network (cGAN). Our model uniquely conditions the generation process on key geometric parameters: pitch angle, azimuth angle, and slant range, to establish a physically meaningful mapping from the spatial domain to the channel response. To overcome the challenge of capturing complex temporal dependencies in CIR sequences, we integrate a Transformer architecture into the generator of a Wasserstein generative adversarial network with gradient penalty (WGAN-GP). This integration ensures stable training and superior modeling of long-range temporal correlations inherent in wireless multi-path propagation. The trained generator acts as an efficient channel twin, capable of synthesizing unlimited realistic CIR samples on demand for simulation purposes. Rigorous quantitative and qualitative evaluations in the baselines and the ablation study are conducted on a proprietary UAV-to-Vehicle dataset. The generated CIRs exhibit remarkable consistency with the real measurements in both visual patterns and key statistical properties. This work provides a robust and scalable data-driven solution for augmenting channel datasets, facilitating the development of future UAV communication systems.","PeriodicalId":34267,"journal":{"name":"IEEE Open Journal of Antennas and Propagation","volume":"7 4","pages":"1200-1214"},"PeriodicalIF":3.4,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11495167","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148675697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Robust Machine Learning Approach to Path Loss Prediction for a Low Altitude UAV-to-Ground Urban Scenario 低空无人机对地城市场景路径损失预测的鲁棒机器学习方法

IF 3.4

IEEE Open Journal of Antennas and Propagation Pub Date : 2026-08-01 Epub Date: 2026-06-24 DOI: 10.1109/OJAP.2026.3706756

Achilleas Theocharopoulos;Nektarios Moraitis;Athanasios D. Panagopoulos

{"title":"A Robust Machine Learning Approach to Path Loss Prediction for a Low Altitude UAV-to-Ground Urban Scenario","authors":"Achilleas Theocharopoulos;Nektarios Moraitis;Athanasios D. Panagopoulos","doi":"10.1109/OJAP.2026.3706756","DOIUrl":"https://doi.org/10.1109/OJAP.2026.3706756","url":null,"abstract":"This paper presents a machine learning-based approach for the prediction of path loss of a <inline-formula> <tex-math>$2times 2$ </tex-math></inline-formula> dual-polarized (DP) multiple-input-multiple-output (MIMO) channel. The communication scenario takes into account the link established between an unmanned aerial vehicle (UAV) and a ground terminal in an urban environment. The proposed machine learning (ML) methodology is thoroughly analyzed, giving particular emphasis on the hazards induced by the sequential nature of the measurement procedure. It is demonstrated that, due to the temporal correlation between the data samples, the conventional random splitting of the dataset leads to substantial overfitting and a biased performance evaluation. To counteract this issue, an alternative partitioning scheme that is based on continuous trajectory segments is proposed and statistically validated. A set of features that leverages both the link geometry and the MIMO channel is extracted and the performance of three well established ML models, namely multi-layer perceptron (MLP), extreme gradient boosting (XGB) and support vector regression (SVR), is investigated, both in terms of mean prediction error and error dispersion. The results reveal that the suggested models exhibit a highly promising performance, delivering low statistical errors and effectively filtering out the small scale component of fading. The average root-mean-square error (RMSE) is found in the range of 1.85–2.20 dB. The XGB delivers the lowest errors, achieving an RMSE of 1.85 dB and an error standard deviation (ESD) of 1.28 dB, outperforming the rest of the employed models. Finally, an insightful error analysis is carried out to identify systematic prediction flaws and suggest targeted improvements.","PeriodicalId":34267,"journal":{"name":"IEEE Open Journal of Antennas and Propagation","volume":"7 4","pages":"1434-1445"},"PeriodicalIF":3.4,"publicationDate":"2026-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11578072","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148676014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficient Wireless Near-Field Links Between Bessel-Beam Launchers 贝塞尔波束发射器之间的高效无线近场链接

IF 3.6

IEEE Open Journal of Antennas and Propagation Pub Date : 2026-06-01 Epub Date: 2025-04-08 DOI: 10.1109/OJAP.2025.3558890

Luca del Biondo;Edoardo Negri;Mauro Ettorre;Alessandro Galli;Paolo Burghignoli;Walter Fuscaldo

{"title":"Efficient Wireless Near-Field Links Between Bessel-Beam Launchers","authors":"Luca del Biondo;Edoardo Negri;Mauro Ettorre;Alessandro Galli;Paolo Burghignoli;Walter Fuscaldo","doi":"10.1109/OJAP.2025.3558890","DOIUrl":"https://doi.org/10.1109/OJAP.2025.3558890","url":null,"abstract":"The focused nature of Bessel beams allows for secure and efficient wireless links in the near-field region. Still, at millimeter waves, few studies analyze the transmission efficiency between devices in a systematic way. In addition, present studies only analyze links between launchers of the same kind, which is here demonstrated to be a restricting hypothesis. For this purpose, in this work, we consider two kinds of launchers: a compact resonant cavity and a partially open radial waveguide. The transmission efficiency between two identical devices is first analyzed at various distances, showing that an optimum range exists. The link efficiency is then evaluated while reducing the size of one device. Remarkably, it is shown that there is an operating point for which the link efficiency dramatically increases if the partially open radial waveguide of reduced size is replaced by a compact resonant cavity. Ray-optics interpretations and leaky-wave analysis are used to provide qualitative and quantitative design rules for all kinds of links. The results here reported—all corroborated with full-wave simulations—may revolutionize the concept of wireless links based on Bessel beams at millimeter waves.","PeriodicalId":34267,"journal":{"name":"IEEE Open Journal of Antennas and Propagation","volume":"7 3","pages":"1050-1061"},"PeriodicalIF":3.6,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10955734","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148214874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A High-Order Fast Boundary Element Method as a Benchmarking Computational Framework for RCS Analysis of PEC Targets 高阶快速边界元法作为PEC目标RCS分析的基准计算框架

IF 3.4

IEEE Open Journal of Antennas and Propagation Pub Date : 2026-06-01 Epub Date: 2026-04-07 DOI: 10.1109/OJAP.2026.3681846

Omid Babazadeh;Emrah Sever;Ian Jeffrey;Constantine Sideris;Vladimir I. Okhmatovski

{"title":"A High-Order Fast Boundary Element Method as a Benchmarking Computational Framework for RCS Analysis of PEC Targets","authors":"Omid Babazadeh;Emrah Sever;Ian Jeffrey;Constantine Sideris;Vladimir I. Okhmatovski","doi":"10.1109/OJAP.2026.3681846","DOIUrl":"https://doi.org/10.1109/OJAP.2026.3681846","url":null,"abstract":"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 Integral Equation (CBIE) formulation of the Magnetic Field Integral Equation (MFIE). Acceleration is achieved using both the <inline-formula> <tex-math>$mathcal {H}$ </tex-math></inline-formula>-matrix framework and distributed parallelism for filling inadmissible blocks, substantially improving computational efficiency in both time and memory usage. We refer to the resulting solver as <inline-formula> <tex-math>$mathcal {H}$ </tex-math></inline-formula>-CBIE and demonstrate its <inline-formula> <tex-math>$O(h^{p})$ </tex-math></inline-formula> error convergence, scalability, and accuracy through extensive numerical results, <inline-formula> <tex-math>$h$ </tex-math></inline-formula> being the mesh element size and <inline-formula> <tex-math>$p$ </tex-math></inline-formula> the order of discretization. Localized <inline-formula> <tex-math>$hp$ </tex-math></inline-formula>-refinement is incorporated for sharp-edge problems to maintain accuracy near edges and junctions. We include a comprehensive complexity analysis of the high-order accelerated framework, detailing the error-dependent wall time scaling for each stage of the solution process. The resulting scaling dependencies show that the total solution wall time grows quadratically in <inline-formula> <tex-math>$N$ </tex-math></inline-formula> with the target accuracy when high-order discretizations are used, whereas it rises exponentially for traditional low-order methods, underscoring the substantial efficiency gains of the proposed approach and its suitability for benchmarking.","PeriodicalId":34267,"journal":{"name":"IEEE Open Journal of Antennas and Propagation","volume":"7 3","pages":"946-961"},"PeriodicalIF":3.4,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11475824","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148511934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Compact Dual-Mode CP Antenna With Wide AR Beamwidths for BDS-Based Vehicular Applications 基于bds的车载应用的具有宽AR波束宽度的紧凑型双模CP天线

IF 3.4

IEEE Open Journal of Antennas and Propagation Pub Date : 2026-06-01 Epub Date: 2026-02-13 DOI: 10.1109/OJAP.2026.3664692

Zhuolin Deng;Jianbin Li;Huanhuan Peng;Qi Zou;Pei Xiao;Gaosheng Li

{"title":"Compact Dual-Mode CP Antenna With Wide AR Beamwidths for BDS-Based Vehicular Applications","authors":"Zhuolin Deng;Jianbin Li;Huanhuan Peng;Qi Zou;Pei Xiao;Gaosheng Li","doi":"10.1109/OJAP.2026.3664692","DOIUrl":"https://doi.org/10.1109/OJAP.2026.3664692","url":null,"abstract":"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 through a frequency-driven dual-mode mechanism with structural reuse. The antenna comprises a microstrip feed, a shared cross-slot aperture, an air gap, and a suspended radiating patch. At 1176.45 MHz, the cross-slot operates as a pair of orthogonal magnetic-dipole radiators to generate right-hand circular polarization (RHCP). At 1575.42 MHz, the same cross-slot transitions to a coupling aperture that excites the suspended patch, forming a CP patch-dominant mode. This shared-aperture modal reconfiguration integrates two distinct CP mechanisms within a compact structure. Measurements show −10dB impedance bandwidths of 3.6% (1158–1200 MHz) and 3.8% (1538–1597 MHz). The 3-dB AR beamwidths reach 190° and 223° at the two bands, respectively, with measured RHCP gains of 3.5 and 6.5 dBic. The proposed antenna is suitable for compact BDS-based vehicular terminals requiring wide-angle satellite visibility.","PeriodicalId":34267,"journal":{"name":"IEEE Open Journal of Antennas and Propagation","volume":"7 3","pages":"838-848"},"PeriodicalIF":3.4,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11396013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148518031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0