IEEE Open Journal of Antennas and Propagation最新文献_第7页

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

Ultraminiature RFID Chipless Tag Detection Through Magnetic Near-Field 通过近磁场的超小型RFID无芯片标签检测

IF 3.6

IEEE Open Journal of Antennas and Propagation Pub Date : 2026-06-01 Epub Date: 2025-10-24 DOI: 10.1109/OJAP.2025.3625418

Adrián Fernández Carnicero;Florian Fernand Hartmann;Germán A. Ramírez;Luis Guillermo Villanueva;Anja K. Skrivervik

{"title":"Ultraminiature RFID Chipless Tag Detection Through Magnetic Near-Field","authors":"Adrián Fernández Carnicero;Florian Fernand Hartmann;Germán A. Ramírez;Luis Guillermo Villanueva;Anja K. Skrivervik","doi":"10.1109/OJAP.2025.3625418","DOIUrl":"https://doi.org/10.1109/OJAP.2025.3625418","url":null,"abstract":"This work presents the design, fabrication, and experimental validation of a complete near-field magnetic RFID system tailored for the detection of ultraminiature RFID chipless tags operating in the UHF range. The proposed system comprises four subwavelength-sized chipless RFID tags, a RFID reader and a backend detection system. The chipless tags are implemented as LC resonators consisting of an octagonal loop antenna and a floating capacitor that have areas of 17.89 mm2, 2.92 mm2, 1.65 mm2 and 0.75 mm2 and resonate at 1.21 GHz, 1.33 GHz, 1.29 GHz and 1.18 GHz, respectively. The RFID reader is a frequency-reconfigurable segmented loop antenna with an area of 122.54 mm2 that is controlled by voltage and operates between 1.14 GHz and 1.50 GHz. To evaluate the maximum detection distance at which each tag can be detected by the reader, a backend system based on the Frequency Sweep Envelope (FSE) method is applied to the phase derivative of both the reflection coefficient and the input impedance measured at the reader, in absence and presence of the different tags. The results demonstrate that combining the FSE method with the derivative of the input impedance phase provides higher sensitivity to the subtle perturbations introduced by the ultraminiature tags, enabling greater detection distances.","PeriodicalId":34267,"journal":{"name":"IEEE Open Journal of Antennas and Propagation","volume":"7 3","pages":"1129-1142"},"PeriodicalIF":3.6,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11217216","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148214880","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 Instructions for authors 面向作者的IEEE天线和传播指南开放期刊

IF 3.6

IEEE Open Journal of Antennas and Propagation Pub Date : 2026-06-01 Epub Date: 2026-06-11 DOI: 10.1109/OJAP.2026.3690274

引用次数: 0

High-Order Quad-Band Bandpass FSSs With Multiple TZs for EMI Protection in WPT Scenarios WPT场景中用于EMI保护的高阶四频带多TZs带通fss

IF 3.4

IEEE Open Journal of Antennas and Propagation Pub Date : 2026-06-01 Epub Date: 2025-06-10 DOI: 10.1109/OJAP.2025.3578397

Runze Li;Li Yang;Shiyan Wang;Roberto Gómez-García

{"title":"High-Order Quad-Band Bandpass FSSs With Multiple TZs for EMI Protection in WPT Scenarios","authors":"Runze Li;Li Yang;Shiyan Wang;Roberto Gómez-García","doi":"10.1109/OJAP.2025.3578397","DOIUrl":"https://doi.org/10.1109/OJAP.2025.3578397","url":null,"abstract":"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 composed of three metal periodic arrays.These layers are separated by two thin dielectric substrates in a stacked multi-layer arrangement. The top and bottom metal arrays are made up of a gridded-convoluted four-loop structure that operates as a multi-resonant cell. The middle metal array, which behaves as a bandstop-type aperture layer, exploits as constituent cell a square-shaped microstrip ring with four quarter-wavelength stepped-impedance microstrip lines inside it. Two replicas of the basic FSS element are back-to-back connected for the realization of a higher-order FSS configuration. Thus, through its appropriate design, a sharp-rejection quadruple-band bandpass filtering functionality with out-of-band transmission zeros (TZs) at both sides of all passbands can be realized in the overall FSS structure. Firstly, lumped-element-based behavioral circuit models of the engineered quad-band bandpass FSS element and its two types of metallic layers are presented. Subsequently, the electromagnetic-(EM)-based design of the devised FSS structure through effective-coupling-coefficient extraction and parametric analysis is carried out. The performance robustness of the proposed quad-passband FSS principle depending on the number of elements with regard to the infinitely-periodic-extended ideal geometric formation is also evaluated. Finally, for experimental-demonstration purposes, proof-of-concept prototypes of the conceived high-order FSS and its basic FSS element with four passbands within the 5–20-GHz range are built and tested. Their measured results in terms of power transmission and reflection responses under normal and oblique incidences are also shown.","PeriodicalId":34267,"journal":{"name":"IEEE Open Journal of Antennas and Propagation","volume":"7 3","pages":"780-793"},"PeriodicalIF":3.4,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=11029509","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148515631","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