IEEE Transactions on Microwave Theory and Techniques最新文献

{"title":"Heterogeneous Reconfigurable Frequency Selective Surface With Ultrawide Range Performance","authors":"Lin-Man Zhang;Xiao Ding;Maurizio Bozzi","doi":"10.1109/TMTT.2025.3554382","DOIUrl":"https://doi.org/10.1109/TMTT.2025.3554382","url":null,"abstract":"In this article, a series-type equivalent circuit model (ECM) is proposed to effectively broaden the modulation range and capability of reconfigurable frequency selective surface (RFSS). Correspondingly, a heterogeneous RFSS unit, which consists of a coplanar arrangement of two units with different dimensions and different resonant frequencies is designed. The designed multifunctional single-polarized RFSS unit allows for an ultrawide range of tunable transmission passbands and efficient reflection and shielding behavior over the entire frequency range by rationally configuring the active elements parameters. In the transmission state, the relative bandwidth (RBW) of the tunable range of transmission poles is significantly increased to 130.9%. In the shielding state, the proposed unit remains transmission coefficient <inline-formula> <tex-math>$vert {S}_{21}vert lt -10$ </tex-math></inline-formula> dB over the entire frequency band. Utilizing the robust reconfigurability, the proposed RFSS unit can achieve excellent angular stability additionally. The prototype is fabricated and measured to verify the effectiveness and feasibility of the design. This work greatly expands the ability of RFSS to modulate electromagnetic waves. It broadens application scenarios of broadband antenna by providing a new feasible solution for achieving superior performance in multifunctional RFSS.","PeriodicalId":13272,"journal":{"name":"IEEE Transactions on Microwave Theory and Techniques","volume":"73 9","pages":"6221-6233"},"PeriodicalIF":4.5,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145073322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nonlinear Transmission Line GaN MMIC Frequency Comb Generator","authors":"Joel Johnson;Cody Scarborough;Zoya Popović","doi":"10.1109/TMTT.2025.3553435","DOIUrl":"https://doi.org/10.1109/TMTT.2025.3553435","url":null,"abstract":"This article presents the design and characterization of a uniform nonlinear transmission line (NLTL) monolithic microwave integrated circuit (MMIC) implemented in a 150-nm GaN process on a 50-<inline-formula> <tex-math>$mu $ </tex-math></inline-formula>m-thick SiC substrate. The implementation in GaN allows for high power handling, and this article presents measured phase noise at fundamental and harmonics generated with a 1-W GaN NLTL. The NLTL unit cell is designed with two series lumped inductors and a diode-connected transistor in reverse bias. After varying the number of unit cells in nonlinear simulations, eight elements are chosen for the final implementation at a fundamental input frequency range from 2 to 3 GHz, with maximized conversion efficiency for harmonics below 8.5 GHz. For input powers between 20 and 30 dBm at 2 GHz, the generated frequency comb is measured and has a minimum conversion loss of 10.7, 17.3, and 24.9 dB and a maximum output power of 17.8, 11.6, and 4.1 dBm at 4, 6, and 8GHz, respectively. Similarly, at 3 GHz, conversion loss of 9.9 and 22.7 dB and output power of 16.0 and 4.3 dBm at 6 and 9 GHz are measured, respectively. In all cases, the input return loss is less than 10 dB. In the time domain, the NLTL produces pulses with widths of 80 and 67 ps when excited with 30 dBm input power at 2 and 3 GHz, respectively. The phase noise measured at the first three harmonics (<inline-formula> <tex-math>${N} =2$ </tex-math></inline-formula>, 3, 4) increases as 20 log₁₀(<italic>N</i>) with very low additive phase noise, where <italic>N</i> is the frequency multiplication factor.","PeriodicalId":13272,"journal":{"name":"IEEE Transactions on Microwave Theory and Techniques","volume":"73 6","pages":"3075-3084"},"PeriodicalIF":4.1,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144272783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"D-Band E-Plane Waveguide Bandpass Filters Using Spoof Surface Plasmon Polaritons and Slotted Metal Diaphragms","authors":"Yao Qin;Yinian Feng;Kai-Da Xu;Yuchi Zhang;Lilingfei Jiang;Zhongqian Niu;Bo Zhang","doi":"10.1109/TMTT.2025.3553414","DOIUrl":"https://doi.org/10.1109/TMTT.2025.3553414","url":null,"abstract":"In this article, a new design method for <italic>D</i>-band <italic>E</i>-plane waveguide bandpass filters (BPFs) based on the spoof surface plasmon polaritons (SSPPs) and slotted metal diaphragms (SMDs) is proposed, which is analyzed by the slow wave theory of periodic structure. The SSPP structure is fabricated by the electrical discharge machining (EDM) process, which is etched on the copper foil and inserted into the <italic>E</i>-plane of the rectangular waveguide (RWG). Due to the introduction of parallel equivalent capacitors in the symmetric slotted structure, the bandpass filtering response can be realized by the SSPP itself. For validation, two different types of <italic>D</i>-band <italic>E</i>-plane SSPP waveguide BPFs are presented by using slow wave theory and electromagnetic (EM) simulations. The simulated results show that the center frequency and bandwidth of the BPFs can be flexibly tuned by adjusting the size of the SSPP unit cell. To demonstrate and verify the design feasibility, two types of BPFs are fabricated and measured. Good agreement between measured and simulated results shows that the proposed idea will be a good candidate for the <italic>D</i>-band waveguide BPF design with compact size, low insertion loss, and flexible tuning ability.","PeriodicalId":13272,"journal":{"name":"IEEE Transactions on Microwave Theory and Techniques","volume":"73 9","pages":"5828-5840"},"PeriodicalIF":4.5,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145073198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Systematic Inverse Design of Miniaturized Frequency Selective Surfaces Based on Microwave Network Theory and NSGA-III","authors":"Wenrui Zheng;Yunlai Yang;Tian-Xi Feng;Hui Li","doi":"10.1109/TMTT.2025.3552060","DOIUrl":"https://doi.org/10.1109/TMTT.2025.3552060","url":null,"abstract":"As an efficient method for characterizing device properties, microwave network theory plays a critical role in microwave techniques. In this article, inspired by the equivalent circuit model (ECM) of the gridded square loop, a simple but systematic inverse design method is proposed for miniaturizing frequency selective surfaces (FSSs) based on the integrated internal and external microwave network theory. The microwave network model as well as its numerical calculation method under the isotropic FSS architecture are described in detail. Finally, a carefully designed multiobjective optimization problem is established, which is solved by nondominated sorting genetic algorithm III (NSGA-III) autonomously. Following the method, with the single-layered third-order gridded square loop structure and several lumped elements at specific locations, three extremely miniaturized FSSs are achieved, including single-band transmissive FSS, single-band reflective FSS, and multiband transmissive FSS. The realized dimensions for these FSSs are <inline-formula> <tex-math>$0.014~lambda _{0}$ </tex-math></inline-formula>, <inline-formula> <tex-math>$0.012~lambda _{0}$ </tex-math></inline-formula>, and <inline-formula> <tex-math>$0.064~lambda _{0}$ </tex-math></inline-formula>, respectively. Such compact FSSs also enable excellent angular stability, further expanding their applications in electromagnetic shields. A prototype of the miniaturized tri-band transmission FSS was fabricated and measured to validate the effectiveness of the proposed method, with the measured results agreeing well with the simulated ones.","PeriodicalId":13272,"journal":{"name":"IEEE Transactions on Microwave Theory and Techniques","volume":"73 9","pages":"6879-6891"},"PeriodicalIF":4.5,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145073204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"UAV Detection and Classification in Complex Environments Using Radar and Combined Machine-Learning Approaches","authors":"Seksan Eiadkaew;Akkarat Boonpoonga;Krit Athikulwongse;Kamol Kaemarungsi;Danai Torrungrueng","doi":"10.1109/TMTT.2025.3551626","DOIUrl":"https://doi.org/10.1109/TMTT.2025.3551626","url":null,"abstract":"Detecting uncrewed aerial vehicles (UAVs) has introduced significant challenges in ensuring safe and secure airspace, particularly in urban areas with high environmental clutter or complex environments. This article proposes a novel two-stage method for UAV detection and classification using a scanning frequency-modulated continuous wave (FMCW) radar system and machine-learning (ML) techniques. In the first stage, azimuth-range scattering point data transformed from the received radar signals are clustered using hierarchical density-based spatial clustering of applications with noise (HDBSCAN), and environmental boundaries are generated with a convex-hull algorithm to represent static clutter zones. In the second stage, a long short-term memory (LSTM) network analyzes points outside these boundaries, leveraging trajectory patterns to classify UAVs. Unlike conventional Doppler-based methods, the proposed approach excels in scenarios with slow-moving UAVs exhibiting near-zero Doppler shifts. Experimental results demonstrate that the proposed method achieves a detection and classification accuracy of up to 99.83% and an F1 score of 94.69%, outperforming conventional methods in both precision and clutter handling. These findings highlight the robustness of the proposed system in complex environments and its suitability for practical UAV detection applications.","PeriodicalId":13272,"journal":{"name":"IEEE Transactions on Microwave Theory and Techniques","volume":"73 8","pages":"5457-5470"},"PeriodicalIF":4.5,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144853343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of a Beat-Frequency Sensor Operating Near the Locking Boundary","authors":"Mabel Pontón;Sergio Sancho;Almudena Suárez","doi":"10.1109/TMTT.2025.3552963","DOIUrl":"https://doi.org/10.1109/TMTT.2025.3552963","url":null,"abstract":"We present an in-depth investigation of a beat-frequency sensor based on an injected oscillator operating near its locking boundaries. Under these conditions, the beat frequency exhibits higher sensitivity to the material under test (MUT) than the free-running oscillation frequency. We will derive a general expression for the beat frequency as influenced by the MUT. This expression depends on an admittance function that can be extracted from harmonic-balance (HB) simulations, so it can be applied to oscillators of arbitrary complexity. In the new formulation, both the free-running solution and the locking bandwidth will vary with the sensing parameter. We will analyze in depth the beat-frequency curve relative to the parameter under test, as well as its dependence on the design elements. We will also present a new method to establish the selected locking boundary at a suitable value for the anticipated MUT variation range. Additionally, we will demonstrate the potential to sense at a multiple of the beat frequency, thereby increasing frequency sensitivity. For the first time to our knowledge, we will analyze the oscillator phase noise when operating near the locking boundaries by means of a perturbation formulation in the frequency domain. The methods will be illustrated through their application to a cubic-nonlinearity oscillator, enabling a deep theoretical insight, and to a realistic transistor-based oscillator with the MUT placed on top of a capacitive transmission line.","PeriodicalId":13272,"journal":{"name":"IEEE Transactions on Microwave Theory and Techniques","volume":"73 9","pages":"6192-6208"},"PeriodicalIF":4.5,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10948011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145073351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Ka-Band Transmitter With 2.7°/0.28 dB Phase/Gain Error and 21.6% PAE Maintaining Stable Performance Across Process Corners","authors":"Ting Huang;Xiangyu Meng;Chuanjie Chen;Gaoyuan Zhao;Pengfei Bai;Yun Yin;Baoyong Chi","doi":"10.1109/TMTT.2025.3550366","DOIUrl":"https://doi.org/10.1109/TMTT.2025.3550366","url":null,"abstract":"This article presents a Ka-band transmitter for wireless communication that focuses on improving the process corner stability. The proposed transmitter integrates a phase shifter (PS), an attenuator (ATT), a buffer, and a power amplifier (PA). It supports reconfigurable orthogonality from 85.7° to 92.0° in phase shifting, achieving an overall rms phase error of 2.7°. In gain control, the 8-dB attenuation cell eliminates the requirement for compensation capacitors and maintains a stable attenuation performance across different process corners with an overall rms gain error of 0.28 dB. In the PA, improvements on the adaptive bias are made to enhance the performance stability, resulting in a 2.1 dB gain variation and a 0.9 dB OP1dB variation across different process corners. The proposed transmitter realizes an OP1dB of 15 dBm and a maximum PAE of 21.<sc>6</small>%. For 64-QAM modulated signals, the PA achieves an average Pout of 8.9 dBm with −26.2 dB EVM at 28 GHz.","PeriodicalId":13272,"journal":{"name":"IEEE Transactions on Microwave Theory and Techniques","volume":"73 9","pages":"6399-6409"},"PeriodicalIF":4.5,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145073440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dual-Channel Balanced-to-Single-Ended Out-of-Phase Filtering Power Divider-Based High-Gain Dual-Polarized Filtenna Subarray","authors":"Xin Zhou;Gang Zhang;Kam-Weng Tam;Hao Yu;Zhuowei Zhang","doi":"10.1109/TMTT.2025.3553123","DOIUrl":"https://doi.org/10.1109/TMTT.2025.3553123","url":null,"abstract":"In this article, we propose an innovative codesign methodology for a high-gain dual-polarized filtenna subarray based on a dual-channel balanced-to-single-ended (BTSE) out-of-phase filtering power divider (FPD). The design begins with the development of a dual-channel BTSE FPD, which integrates a substrate-integrated waveguide (SIW) resonator with four patch resonators. Interchannel isolation is achieved through the orthogonality of the degenerate TE₁₀₂ and TE₂₀₁ modes within the SIW cavity. The four patches are coupled to the SIW cavity via strategically positioned rectangular apertures, organized into two groups. Balanced feeding probes directly coupled to the patches via these apertures, creating a transmission zero (TZ) in the lower stopband. The out-of-phase characteristics of the TE₁₀₂ and TE₂₀₁ modes result in a 180° phase difference between the output ports on the patches of each group. By removing the output ports, the signal radiates directly through the patches. Due to the out-of-phase characteristics, the two patches in each group exhibit identical surface current directions, effectively forming a dual-polarized <inline-formula> <tex-math>$1times 2$ </tex-math></inline-formula> filtenna subarray. Additionally, the introduction of slots on each patch exhibits opposite electric fields near the slots, generating a lower frequency radiation null (RN). By rotating these slots inward, the reshaped TM₀₂/TM₂₀ modes—featuring directional radiation capabilities—are produced alongside the original TM₁₀/TM₀₁ modes. This creates multiple radiation paths, resulting in an additional in-band resonance and an RN in the upper stopband. To validate the proposed methodology, a prototype is developed, and measured results demonstrate high gain, high selectivity, and excellent polarization isolation.","PeriodicalId":13272,"journal":{"name":"IEEE Transactions on Microwave Theory and Techniques","volume":"73 9","pages":"6643-6653"},"PeriodicalIF":4.5,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145073280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of AlGaN/GaN Schottky Diodes and Rectifiers Based on Innovative Loss Model for Wireless Power Transfer","authors":"Li Huang;Yi-Li Lu;Hong-Liang Li;Ce Wang;Yi Wei;Ka-Ma Huang;Si-Hao Qian;Ce Wang","doi":"10.1109/TMTT.2025.3550968","DOIUrl":"https://doi.org/10.1109/TMTT.2025.3550968","url":null,"abstract":"Reducing the Schottky barrier diode (SBD) loss is imperative for enhancing RF-dc conversion efficiency of rectifier in microwave wireless power transfer (MWPT) systems. However, existing diode models do not adequately describe the role of key loss factor-series resistance (<inline-formula> <tex-math>$R_{S}$ </tex-math></inline-formula>) and junction capacitance (<inline-formula> <tex-math>$C_{!j}$ </tex-math></inline-formula>) in rectification losses. A precise balance between <inline-formula> <tex-math>$C_{!j}$ </tex-math></inline-formula> and <inline-formula> <tex-math>$R_{S}$ </tex-math></inline-formula> is crucial for optimizing the physical design of SBDs and enhancing rectifier efficiency. Thus, we present an improved loss model designed for <inline-formula> <tex-math>$R_{S}$ </tex-math></inline-formula> and <inline-formula> <tex-math>$C_{!j}$ </tex-math></inline-formula>. Our results reveal that the impact of the <inline-formula> <tex-math>$R_{S}$ </tex-math></inline-formula> is more significant compared to that of the <inline-formula> <tex-math>$C_{!j}$ </tex-math></inline-formula> in 1–8 GHz. Then, we designed an AlGaN/GaN Schottky structure with 10 nm barrier layer thickness which reduces resistive losses of <inline-formula> <tex-math>$R_{S}$ </tex-math></inline-formula> during carrier transport across the barrier layer, improving rectification efficiency. We have compared two SBD types: our thin-barrier AlGaN/GaN SBD (SBD-1, layer =10 nm) with <inline-formula> <tex-math>$R_{S}$ </tex-math></inline-formula> of <inline-formula> <tex-math>$3~Omega $ </tex-math></inline-formula>, and a commercial SBD (SBD-2, layer =20 nm) with <inline-formula> <tex-math>$R_{S}$ </tex-math></inline-formula> of <inline-formula> <tex-math>$7~Omega $ </tex-math></inline-formula>, both having almost the identical <inline-formula> <tex-math>$C_{!j}$ </tex-math></inline-formula>. At 5.8 GHz, efficiency of SBD-1 achieved 80.2% with 25.4 dBm input power and <inline-formula> <tex-math>$170~Omega $ </tex-math></inline-formula> load, while the SBD-2 reached 74.4% efficiency at 23 dBm and <inline-formula> <tex-math>$300~Omega $ </tex-math></inline-formula> load. This represents a 5.8% improvement in peak efficiency for SBD-1 compared to SBD-2. Furthermore, SBD-1 maintained high efficiency above 70% with input power from 17 to 28.5 dBm and load from 50 to <inline-formula> <tex-math>$900~Omega $ </tex-math></inline-formula>, highlighting the superiority of the loss model and thin barrier structure for microwave rectification.","PeriodicalId":13272,"journal":{"name":"IEEE Transactions on Microwave Theory and Techniques","volume":"73 9","pages":"6129-6138"},"PeriodicalIF":4.5,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145073446","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and Implementation of Sector-Based Beam Alignment for Backscatter Communications","authors":"Miaoran Peng;Yu Zhang;Lixia Xiao;Jiaxi Zhou;Yang Liu;Tao Jiang","doi":"10.1109/TMTT.2025.3552580","DOIUrl":"https://doi.org/10.1109/TMTT.2025.3552580","url":null,"abstract":"Beam alignment-assisted backscatter exhibits the enormous potential to improve the transmission rate and regulate the electromagnetic direction simultaneously. However, existing designs require decoding components with high power consumption to obtain channel state information (CSI) or provide limited beam patterns that are restricted to a specific direction. To address the above issues, we present a sector-based backscatter (SectorScatter) communication architecture that fulfills beam alignment and passive information transfer with ultralow power consumption. First, the pivotal design of SectorScatter is based on circulators and radio frequency switches, which is capable of guiding the incident wave to arbitrary sectors. Second, a two-stage beam alignment algorithm is proposed to realize adaptive directional sensing with ultralow overhead. Furthermore, a frequency-phase 16-ary modulation scheme based on limited reflection coefficients is advocated to improve the transmitting rate of passive communication. Experimental results show that SectorScatter identifies the transceiver positions in different sectors in less than <inline-formula> <tex-math>$0.15~mu $ </tex-math></inline-formula>s, communicating at a transmitting rate of up to 387 kb/s at 20 m with adaptive beam alignment toward arbitrary sectors.","PeriodicalId":13272,"journal":{"name":"IEEE Transactions on Microwave Theory and Techniques","volume":"73 9","pages":"6892-6904"},"PeriodicalIF":4.5,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145073169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}