Microwave and Optical Technology Letters最新文献

{"title":"A 1–12 GHz Ultra-Wide Band Bidirectional Amplifier Featuring Enhanced Loop Stability","authors":"Rui Diao,&nbsp;Yu Ai,&nbsp;Tiedi Zhang,&nbsp;Chao Fan","doi":"10.1002/mop.70663","DOIUrl":"https://doi.org/10.1002/mop.70663","url":null,"abstract":"<div>\u0000 \u0000 <p>Bidirectional amplifiers (BDAs) are key components in RF communication systems, enabling efficient two-way signal transmission over shared paths. Enhancing their performance is essential for improving signal integrity, reduce power loss, and increase overall system efficiency, particularly in compact and high-frequency wireless applications. In this study, we report the design and fabrication of an ultra-wideband BDA operating at 1–12 GHz using the GaAs 0.25 μm PHEMT process. we introduce a new common-leg topology, which significantly improves the switching speed between transmit and receive (T/R) modes. We incorporate RLC negative feedback and peaking inductor techniques to ensure consistent gain flatness across the operating band of the developed amplifier and provide positive gain slope compensation. Moreover, we analyze the high-frequency stability in the bidirectional signal paths by proposing a design methodology based on the loop stability model to guarantee unconditional stability. Our findings demonstrate a small-signal gain exceeding 13 dB in both T/R modes over the full 1–12 GHz band of the amplifier, with input and output return losses better than 10 dB. The noise figure remains below 4 dB, and the output 1 dB compression point (OP-1dB) is better than 14 dBm. Additionally, the amplifier exhibits stable performance across varying temperature conditions, indicating robust thermal reliability.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"68 6","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148174675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wideband Microstrip Fed Slot Antenna Featuring Mode Conversion and Coordinated Radiation","authors":"Honglin Zhang,&nbsp;Wenxin Ke,&nbsp;Zhijian Chen,&nbsp;Zhijian Li,&nbsp;Shaowei Liao","doi":"10.1002/mop.70661","DOIUrl":"https://doi.org/10.1002/mop.70661","url":null,"abstract":"<div>\u0000 \u0000 <p>Wireless communication systems need broadband antennas with small backward radiation antennas for large throughput and low interference. This letter presents the design of a microstrip fed slot wideband antenna featuring mode conversion between heterogeneous transmission lines and coordinated radiation of multiple slots, which ensure the antenna achieve an average gain of 5.17 dBi in a bandwidth ranging from 0.75 to 2.24 GHz. Aiming at reducing backward radiation, electro-magnetic wave is redirected to the upper hemisphere through four rectangular slots that were placed in the ground plane. Measured results show the antenna's max gain of 6.12 dBi and a variation of ±0.95 dB in a fraction bandwidth of 99.7%, which verifies the design as they agree well with the simulated ones. The average gain increment from original antenna to proposed antenna is 8.6 dB and the average backward radiation reduction from original antenna to proposed antenna is 16.03 dB. The wide bandwidth, small backward radiation and gain variation make the antenna suitable for wideband communication systems.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"68 6","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148174667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Broadband Circularly Polarized Antenna Employing Cascaded Water Dipole and Helix","authors":"Zhenxin Hu,&nbsp;Hao Ding,&nbsp;Ahmed Abdelmottaleb Omar,&nbsp;Jianwei Pan,&nbsp;Liang-Hua Ye,&nbsp;Weiliang Zeng","doi":"10.1002/mop.70647","DOIUrl":"https://doi.org/10.1002/mop.70647","url":null,"abstract":"<div>\u0000 \u0000 <p>This article presents a compact directional circularly polarized (DCP) antenna employing cascaded water dipole and helix. It consists of five half-wavelength water cylinders as vertical dipoles for generating vertical electric component and six half-wavelength open helices for horizontal electric component. The dipoles and helices are connected in series and the central dipole is splitted for a differential feed. Owing to the 90° phase difference between the vertical and horizontal fields and an asymmetric distribution of the dipole radiators, a relative broadband unidirectional CP radiation is achieved by only using a single radiator with compact size. A prototype is fabricated employing 3D printing technology, reducing the difficulty of practical realization of the antenna. Measured results show that a matching bandwidth of 30% and an axial ratio bandwidth of 10.1% are achieved. This antenna features a broadband DCP radiation while having a simple, compact, and highly transparent structure, which is potentially useful for CP wireless communications.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"68 6","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148174700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spectral Characteristics of AlO Molecules in 1064 nm Nanosecond Laser-Induced Aluminum Plasma","authors":"Xuefeng Chu,&nbsp;Qiuyun Wang,&nbsp;Hailong Yu,&nbsp;Xun Gao","doi":"10.1002/mop.70669","DOIUrl":"https://doi.org/10.1002/mop.70669","url":null,"abstract":"<div>\u0000 \u0000 <p>As the plasma plume generated by nanosecond laser ablation of aluminum expands in ambient air, AlO molecules are formed through reactions between aluminum species in the plasma and oxygen-containing species in the surrounding atmosphere. In this work, the emission characteristics of AlO molecules in 1064 nm nanosecond laser-induced aluminum plasma were systematically investigated by time-resolved optical emission spectroscopy. The influence of laser energy on the temporal evolution of AlO molecules was analyzed, and the plasma electron temperature was determined. At a fixed laser energy, the intensity of atomic Al emission decreases gradually with delay time, whereas the AlO molecular emission first increases and then decreases, reaching a maximum at about 20 μs. When the laser energy is increased from 30 to 70 mJ, the AlO molecules peak shifts to later delay times and the emission duration becomes longer. Meanwhile, the plasma electron temperature rises from about 4000 K to 5500 K. These findings show that the formation and evolution of AlO molecules are closely related to the thermal state and cooling process of the plasma, and provide useful insight into molecular formation and related plasma chemical reactions in laser-induced plasma.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"68 6","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148174756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 of a Dual-Band Reconfigurable Doherty Power Amplifier Based on Dual-Mode and Dual-State Optimization","authors":"Yuxuan Sun,&nbsp;Jing Xia,&nbsp;Wa Kong,&nbsp;Zhongpeng Ni,&nbsp;Heng Zhang,&nbsp;Wence Zhang,&nbsp;Chao Yu,&nbsp;Xiao-Wei Zhu","doi":"10.1002/mop.70644","DOIUrl":"https://doi.org/10.1002/mop.70644","url":null,"abstract":"<div>\u0000 \u0000 <p>This paper presents a reconfigurable dual-band Doherty power amplifier (DPA) that uses a dual-mode and dual-state optimization method to meet the requirements of different operating frequency bands. First, load-pull simulations are performed for both frequency bands in saturation and back-off power states. Then, the on/off states of PIN diodes are switched to change the carrier output matching network (OMN) and the phase of the DPA. When the PIN diodes are off, the DPA operates in Mode 1 (2.6–2.8 GHz), while it operates in Mode 2 (3.4–3.7 GHz) when the PIN diodes are on. To ensure high efficiency in different modes, the carrier OMN is optimized using an adaptive particle swarm optimization algorithm by targeting a dual-mode and dual-state impedance objective function, meeting the impedance requirements for both saturation and back-off power states under Mode 1 and Mode 2. For validation, a dual-band reconfigurable DPA operating at 2.6–2.8 GHz and 3.4–3.7 GHz is designed and fabricated. Measurement results show that for Mode 1 and Mode 2, the saturated efficiency exceeds 52.7%, the 6 dB back-off efficiency exceeds 42.5%, and the saturated power exceeds 43 dBm.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"68 6","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148174703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Wideband Angularly Stable Cross-Polarization Converter With High Efficiency and RCS Reduction","authors":"Riya Malia,&nbsp;Archana Rajput","doi":"10.1002/mop.70662","DOIUrl":"https://doi.org/10.1002/mop.70662","url":null,"abstract":"&lt;div&gt;\u0000 \u0000 &lt;p&gt;A low-profile, compact, and wideband reflective cross-polarization converter (CPC) metasurface is proposed. The unit cell, consisting of an &lt;span&gt;l&lt;/span&gt;-shaped metallic strip and a diagonally shifted square patch, has a periodicity of &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;0.168&lt;/mn&gt;\u0000 \u0000 &lt;msub&gt;\u0000 &lt;mi&gt;λ&lt;/mi&gt;\u0000 \u0000 &lt;mi&gt;L&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; $0.168{lambda }_{L}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;, where &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;λ&lt;/mi&gt;\u0000 \u0000 &lt;mi&gt;L&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; ${lambda }_{L}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; is the wavelength at the lowest operating frequency. The structure is printed on a thin FR-4 dielectric layer of thickness &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;0.005&lt;/mn&gt;\u0000 \u0000 &lt;msub&gt;\u0000 &lt;mi&gt;λ&lt;/mi&gt;\u0000 \u0000 &lt;mi&gt;L&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; $0.005{lambda }_{L}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; and incorporates a 4.5 mm air gap (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;0.094&lt;/mn&gt;\u0000 \u0000 &lt;msub&gt;\u0000 &lt;mi&gt;λ&lt;/mi&gt;\u0000 \u0000 &lt;mi&gt;L&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; $0.094{lambda }_{L}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;), backed by a copper ground plane, resulting in a total thickness of &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;0.099&lt;/mn&gt;\u0000 \u0000 &lt;msub&gt;\u0000 &lt;mi&gt;λ&lt;/mi&gt;\u0000 \u0000 &lt;mi&gt;L&lt;/mi&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; $0.099{lambda }_{L}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;. The proposed design achieves an average polarization conversion ratio (PCR) above 90% over a wide fractional bandwidth of 91.14% (7.29–19.52 GHz). Under oblique incidence, the average PCR remains above 93% up to &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;sem","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"68 6","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148174754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Single-Layer Miniaturized Endfire Filtering Antenna With Radiation Pattern Reconfigurability","authors":"Ming Xiang,&nbsp;Chun Liang,&nbsp;Xiao Liu,&nbsp;Hao-Lan Zhou,&nbsp;Dajiang Li,&nbsp;Kun-Zhi Hu","doi":"10.1002/mop.70627","DOIUrl":"https://doi.org/10.1002/mop.70627","url":null,"abstract":"<div>\u0000 \u0000 <p>This letter presents the design and implementation of a single-layer pattern-reconfigurable endfire filtering antenna. Based on a microstrip quasi-Yagi structure, the antenna achieves controllable reversal of the end-fire radiation pattern between the +Z and -Z directions by integrating PIN diodes into the radiation enhancement strips. A pair of U-shaped parasitic strips is placed near the driven element, introducing two additional resonances within the passband to extend the impedance bandwidth and generating a radiation null in the upper stopband to enhance filtering capability. Additionally, a pair of bent parasitic strips is incorporated to create a radiation null in the lower stopband, thereby enhancing out-of-band suppression. Measured results demonstrate that the antenna achieves a −10 dB impedance bandwidth of at least 18.1% in both the endfire directions, exhibiting advantages such as single‑layer structure, miniaturized size, favorable radiation performance, and good agreement between simulation and measurement.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"68 6","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148174755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Highly-Integrated Active Reconfigurable Broadband Van Atta Retrodirective Antenna Array","authors":"Dinglun He,&nbsp;Shufang Li,&nbsp;Li Deng","doi":"10.1002/mop.70648","DOIUrl":"https://doi.org/10.1002/mop.70648","url":null,"abstract":"<div>\u0000 \u0000 <p>The currently available Van Atta retrodirective antenna arrays are confined to having single and fixed functions, low integration, narrow bandwidth, and a high profile. These limitations hinder their integration with other systems and confine their applications. In this letter, we incorporate surface mount technology (SMT) and radio frequency (RF) chip technology into the Van Atta retrodirective antenna array. Consequently, we develop a low-profile, highly integrated active reconfigurable broadband retrodirective antenna array. This array can operate within the 5–6.2 GHz bandwidth, achieving a relative bandwidth of 21%. It offers an adjustable radar cross section (RCS) range of −41 ~ 20 dB. When the gain is between 0 and 10 dB, within the ±40° range, the radar RCS fluctuation doesn't exceed 3 dB, and the profile height is under 4 mm. Owing to its outstanding retrodirective performance, high-level integration, flexible reconfigurability, and broadband characteristics, this array is highly adaptable to fields such as radar simulation, target deception, and Internet of Things (IoT) communication.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"68 6","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148174758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multiobjective Optimization Design of Transmitting Antenna for Microwave Wireless Power Transmission","authors":"Yijing Hu,&nbsp;Qinghe Zhang,&nbsp;Lei Zhang,&nbsp;Zhaoyang Shen,&nbsp;Han Liu","doi":"10.1002/mop.70659","DOIUrl":"https://doi.org/10.1002/mop.70659","url":null,"abstract":"<div>\u0000 \u0000 <p>Microwave wireless power transmission is a technology that achieves wireless power transmission through microwaves, widely used in fields such as wireless charging and space solar power plants. Its core performance indicators include beam collection efficiency, peak radiation level, and aperture power coefficient. This paper proposes a multiobjective antenna optimization design method for wireless power transmission that integrates surrogate models to address the issue of insufficient consideration of these performance metrics and inefficient optimization in existing research. First, Bernstein polynomial basis functions are used to reduce the dimensionality of the antenna design decision space and the number of decision variables, Multiobjective optimization functions are analyzed and designed, a surrogate model based on Gaussian processes is constructed, and the efficiency of antenna optimization design is improved; Finally, the multiobjective optimization design of reflector antenna aperture illumination is achieved using the covariance matrix adaptive evolutionary multiobjective optimization algorithm. The numerical and comparative results have verified the effectiveness of the proposed method, providing new insights for the design of microwave wireless power transmission systems.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"68 6","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148174753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Novel Millimeter-Wave Circularly-Polarized SIW Slot Antenna Array","authors":"Zi-Lin Sun,&nbsp;Run-Kuan Liu,&nbsp;Rui-Sen Chen,&nbsp;Shao-Ting Mao,&nbsp;Qiang Shao,&nbsp;Guan-Long Huang,&nbsp;Xian-Hui He,&nbsp;Mustafa K. Taher Al-Nuaimi,&nbsp;Sai-Wai Wong","doi":"10.1002/mop.70664","DOIUrl":"https://doi.org/10.1002/mop.70664","url":null,"abstract":"<div>\u0000 \u0000 <p>Millimeter-wave circularly-polarized substrate integrated waveguide (SIW) slot antennas using novel resonant modes are proposed in this paper. Unlike conventional circularly polarized SIW slot antennas, the proposed circularly polarized slot antenna employs two novel SIW TE₁₀₁ and TE₀₁₁ cavity modes, with the electric field oriented parallel to the metal plane. The resonant frequencies of TE₁₀₁ and TE₀₁₁ modes in SIW cavity are mainly determined by the cavity height. Consequently, they have high resonant frequencies, demonstrating good feasibility for designing millimeter-wave circularly-polarized slot antennas. Additionally, the radiation slots on the top metal plane are excited by the electric field of the cavity modes, which eliminates the need of power dividing network for feeding the array elements, thereby simplifying the antenna feeding structure. A 4×4 millimeter-wave circularly polarized SIW slot array is then designed and analyzed. The final results show that the proposed antenna can achieve 3.24% operation bandwidth, 12.19 dBic peak gain, and higher than 90% total efficiency.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"68 6","pages":""},"PeriodicalIF":1.2,"publicationDate":"2026-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148174701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}