International Journal of RF and Microwave Computer-Aided Engineering最新文献

Ultrawideband MIMO Array With Self-Decoupled Building Blocks for 5G Smartphones 5G智能手机的自解耦超宽带MIMO阵列

IF 1 4区工程技术

International Journal of RF and Microwave Computer-Aided Engineering Pub Date : 2025-10-10 DOI: 10.1155/mmce/4307648

Aidi Ren, Haoran Yu, Wenjun Xuan, Lixia Yang, Zhixiang Huang, Xiaolin Zhang

{"title":"Ultrawideband MIMO Array With Self-Decoupled Building Blocks for 5G Smartphones","authors":"Aidi Ren, Haoran Yu, Wenjun Xuan, Lixia Yang, Zhixiang Huang, Xiaolin Zhang","doi":"10.1155/mmce/4307648","DOIUrl":"https://doi.org/10.1155/mmce/4307648","url":null,"abstract":"In this paper, an ultrawideband self-decoupled building block with two antennas is constructed, which achieves high isolation between bandwidths without any decoupling structures. An ultrawideband operation is achieved by exciting two 0.25λ open slot modes and a loop mode. The wideband decoupling is usually a thorny problem, and our self-decoupling design within ultrawideband is verified by canceling the common and differential mode currents of every resonant mode. As a result, the proposed broadband building block not only operates in a wide bandwidth of 3.39–8.2 GHz (83%), including LTE band 42 (3.4–3.6 GHz), n79 (4.4–5 GHz), and both the n46 (5.15–5.925 GHz) and n96 (5.925–7.125 GHz), but also demonstrates high isolation (> 15.2 dB) over the entire bandwidth. An eight-element MIMO array consisting of four building blocks is designed, processed, and tested. The measured results demonstrate that the antenna system can provide good isolation in the 3.39–8.2 GHz operating band with good efficiencies (> 58%) and low ECCs (< 0.09). The proposed building block, with its benefits of ultrawideband, high isolation, self-decoupling, and simple structure, is very promising for 5G mobile communications.","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2025 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/4307648","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145272933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Subtractive Clustering–Assisted Surrogate Model to Fast Optimal Design of Traveling Wave Tubes 减聚类辅助代理模型在行波管快速优化设计中的应用

IF 1 4区工程技术

International Journal of RF and Microwave Computer-Aided Engineering Pub Date : 2025-10-01 DOI: 10.1155/mmce/8295978

Lai Jiang, Tao Huang, Yuan Wang, Liang Tao, Wen-kai Deng, Xiao-lin Jin, Da-peng Gong

{"title":"Subtractive Clustering–Assisted Surrogate Model to Fast Optimal Design of Traveling Wave Tubes","authors":"Lai Jiang, Tao Huang, Yuan Wang, Liang Tao, Wen-kai Deng, Xiao-lin Jin, Da-peng Gong","doi":"10.1155/mmce/8295978","DOIUrl":"https://doi.org/10.1155/mmce/8295978","url":null,"abstract":"The current techniques in performance improvement of space traveling wave tubes (TWTs) have limitations. It is difficult to consider the balance of several technique indexes, optimized design accuracy, and calculation cost. To tackle such a burden, a multiobjective optimization framework based on the Kriging model is proposed in this research. This framework takes advantage of what Kriging models approximate the responses of the electromagnetic simulation process. It reduces the obstacles caused by multiple-task calculations of TWTs due to the high cost of accurate simulation. In the design of the L-band helix TWT in this research, the predicted values of the model are used as the objective functions, and the multiobjective optimization of its interaction segment is carried out. Also, the proposed infill sampling criterion based on the subtractive clustering method in this research raised the efficiency of building the Kriging model. The numerical results demonstrate that the proposed multiobjective optimization framework is reliable for designing TWTs. It can quickly produce an optimal design scheme, significantly improving the performance of the designed TWTs compared to the original design.","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2025 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/8295978","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145223945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Broadband Vialess Microstrip-to-Microstrip Vertical Transition in Multilayer Liquid Crystal Polymer Substrate for W-Band Applications 用于w波段应用的多层液晶聚合物衬底宽带无缝隙微带到微带垂直跃迁

IF 1 4区工程技术

International Journal of RF and Microwave Computer-Aided Engineering Pub Date : 2025-09-30 DOI: 10.1155/mmce/1783648

Weihong Liu, Songbo Wang, Xu Zhang

{"title":"Broadband Vialess Microstrip-to-Microstrip Vertical Transition in Multilayer Liquid Crystal Polymer Substrate for W-Band Applications","authors":"Weihong Liu, Songbo Wang, Xu Zhang","doi":"10.1155/mmce/1783648","DOIUrl":"https://doi.org/10.1155/mmce/1783648","url":null,"abstract":"In this paper, a W-band broadband vialess microstrip (MS)-to-MS vertical transition based on coplanar waveguide (CPW) multimode resonators (MMRs) on a four-layer liquid crystal polymer (LCP) substrate has been proposed. In this four-layer structure, the CPW MMRs are located in the second layer, the top layer T-type MS and the third layer MS are combined to form the feeding structure and excite the resonant modes. The proposed CPW MMRs can achieve multimode excitation by shifting the location of the feeding points, and then mutual coupling is to form a broadband vialess vertical transition. In order to further improve the transmission performance of this vialess vertical transition in W-band, the offset distance between two feeding points of the CPW MMRs is optimized by HFSS, thus three resonant modes are introduced within the frequency range from 70.38 to 100.03 GHz. To verify this design, a three-pole broadband vertical transition fabricated on a four-layer LCP substrate is measured. The measured results indicate that a broadband structure ranging from 75.66 to 97.71 GHz can be obtained with a minimum in-band insertion loss (IL) of 1.8 dB and a return loss (RL) of above 10 dB. Therefore, the superiority of the proposed CPW MMRs in the realization of broadband vialess vertical transition is effectively verified.","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2025 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/1783648","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145224530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Area-Efficient Cascode Inductive Source-Degenerated CMOS LNA for GPS L1 Band GPS L1波段的面积高效级联电感源退化CMOS LNA

IF 1 4区工程技术

International Journal of RF and Microwave Computer-Aided Engineering Pub Date : 2025-09-26 DOI: 10.1155/mmce/5576122

Kunpeng Xu, Haoran Sun, Lingzhi Xu, Yong Li, Xiaopeng Yu

{"title":"Area-Efficient Cascode Inductive Source-Degenerated CMOS LNA for GPS L1 Band","authors":"Kunpeng Xu, Haoran Sun, Lingzhi Xu, Yong Li, Xiaopeng Yu","doi":"10.1155/mmce/5576122","DOIUrl":"https://doi.org/10.1155/mmce/5576122","url":null,"abstract":"In this paper, an area-efficient low-noise amplifier for GPS L1 band application is designed. Besides the requirements of noise figure (NF), bandwidth, and input matching, the design methodology has been focused on the area efficiency. As a design example, a prototype L1 band LNA is implemented using standard 0.11 μm CMOS technology. The design is based on a conventional cascode inductive source-degenerated topology, but special care has been dedicated to the three inductors. To reduce cost, specifically by minimizing on-chip area and imposing constraints on power consumption, the source inductor is implemented using a bond wire. As the dominant contributor of silicon area, the drain inductor has been optimized in a very area-efficient way. The design trade-off between input matching and noise matching is consequently adopted to achieve minimized NF. Measurement results indicate that the LNA achieves a measured power gain of 14.3 dB at 1.57 GHz with a NF of 1.37 dB, while consuming 1.9 mA from a standard 1.8 V supply and occupying a chip area of 300 × 230 μm.","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2025 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/5576122","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145146933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design of SIW-Based Compact and High-Gain Filtenna Array for W-Band 基于siw的w波段紧凑型高增益滤波器阵列设计

IF 1 4区工程技术

International Journal of RF and Microwave Computer-Aided Engineering Pub Date : 2025-09-18 DOI: 10.1155/mmce/5516031

Dong Gang, Zhou Ziyu, Meng Lingdong

引用次数: 0

Data Transmission System With High Data Rate for SDGSAT-1 Small Satellite SDGSAT-1小卫星高速率数据传输系统

IF 1 4区工程技术

International Journal of RF and Microwave Computer-Aided Engineering Pub Date : 2025-09-03 DOI: 10.1155/mmce/6652786

Huilin Tang, Yongsheng Deng, Dehai Zhang

引用次数: 0

Single-Layer Quadruple-Frequency Dual-Mode Circularly Polarized All-Textile Wearable Antenna 单层四倍频双模圆极化全纺织可穿戴天线

IF 1 4区工程技术

International Journal of RF and Microwave Computer-Aided Engineering Pub Date : 2025-08-28 DOI: 10.1155/mmce/9965518

Pegah Rahmatian, Masoud Movahhedi

{"title":"Single-Layer Quadruple-Frequency Dual-Mode Circularly Polarized All-Textile Wearable Antenna","authors":"Pegah Rahmatian, Masoud Movahhedi","doi":"10.1155/mmce/9965518","DOIUrl":"https://doi.org/10.1155/mmce/9965518","url":null,"abstract":"This paper presents a multifunctional wearable antenna that operates in multiple frequency bands, including 2.4, 4.5, 5.8, and 6.4 GHz. The proposed antenna structure is designed for both industrial scientific medical (ISM) and wireless body area network (BAN) frequency bands. The antenna employs metamaterial (MTM) unit cells to enable modes with different radiation patterns, implementing monopole-like (null at broadside) and patch-like patterns for on- and off-body communications. The maximum gain achieved is 7.6 dB at 4.5 GHz, and the antenna also provides circular polarization in the off-body frequency (5.8 GHz) with a minimum 1.13 dB axial ratio (AR). The structure is fed by a microstrip feedline for user convenience, and a full-ground plane is included to protect the human body from backward radiation. To validate the advantages of the proposed design, the antenna was fabricated, and its parameters were measured. The results showed good agreement between simulation and measurement. The effect of antenna bending was also investigated, and the results indicated that the antenna operates acceptably for bending radii up to 60 mm. Additionally, the specific absorption rate (SAR) was investigated, and low values below the standard rates were confirmed.","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2025 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/9965518","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144915119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","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 Learning-Based Variational Backpropagation Method for Inverse Scattering Problems 逆散射问题的一种基于学习的变分反向传播方法

IF 1 4区工程技术

International Journal of RF and Microwave Computer-Aided Engineering Pub Date : 2025-08-13 DOI: 10.1155/mmce/5531090

Changlin Du, Jie Ma, Shenghua Fu, Jin Pan, Yanwen Zhao, Deqiang Yang

{"title":"A Learning-Based Variational Backpropagation Method for Inverse Scattering Problems","authors":"Changlin Du, Jie Ma, Shenghua Fu, Jin Pan, Yanwen Zhao, Deqiang Yang","doi":"10.1155/mmce/5531090","DOIUrl":"https://doi.org/10.1155/mmce/5531090","url":null,"abstract":"The fusion of deep learning techniques with conventional methods has garnered significant attention within the field of electromagnetic inverse scattering. The utilization of a traditional noniterative method for acquiring a presolution, followed by an enhancement procedure via neural networks, presents notable benefits such as simplicity and fast computational speed. However, the accuracy of this approach is usually impacted by the precision of the presolution, especially for strong scatterers. To alleviate this limitation, this research introduces a novel learning-based variational backpropagation method (VBPM). Through the utilization of variational operations, the proposed method refines the initial induced current obtained by the backpropagation (BP) method. Subsequently, an appropriate neural network is constructed to establish the relationship between the refined presolution and the true solution. Compared with the BP scheme (BPS) without variational operations, the proposed approach effectively enhances the solution accuracy with almost the same inversion time.","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2025 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/5531090","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144833222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design and Performance Analysis Comparison of a DWDM Optical Communication Network With and Without EDFA and LCFBG for High Data Rate Transmissions 用于高数据速率传输的DWDM光通信网络设计与性能分析比较

IF 1 4区工程技术

International Journal of RF and Microwave Computer-Aided Engineering Pub Date : 2025-08-03 DOI: 10.1155/mmce/4008918

S. Maria Seraphin Sujitha, Kannan Pauliah Nadar

{"title":"Design and Performance Analysis Comparison of a DWDM Optical Communication Network With and Without EDFA and LCFBG for High Data Rate Transmissions","authors":"S. Maria Seraphin Sujitha, Kannan Pauliah Nadar","doi":"10.1155/mmce/4008918","DOIUrl":"https://doi.org/10.1155/mmce/4008918","url":null,"abstract":"Wavelength division multiplexing (WDM) technology is widely used in high-capacity optical communication systems, enabling the simultaneous transmission of multiple signals over optical fiber. However, signal attenuation and dispersion pose significant challenges to long-distance optical transmission. To mitigate these effects, this study investigates the performance of a four-channel dense wavelength division multiplexing (DWDM) network with and without the use of an erbium-doped fiber amplifier (EDFA) and linear chirped fiber Bragg grating (LCFBG). In the absence of EDFA and LCFBG, the signal quality factor (QF) deteriorates as the bit rate increases, with a marked degradation at higher transmission speeds. Our results show that the introduction of EDFA significantly reduces the bit error rate (BER) and improves the QF. Moreover, combining EDFA with LCFBG provides superior performance, effectively compensating for dispersion and attenuation across various transmission distances (0.5, 1, 1.5, and 2 km) and data rates (2, 5, 8, 10, 15, and 20 Gbps). The combination of EDFA and LCFBG outperforms other configurations in terms of signal quality, with a notable improvement in the QF and overall system reliability. These findings suggest that the integrated use of EDFA and LCFBG is an effective solution for enhancing the performance of DWDM systems, especially for long-haul, high-capacity optical transmission.","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2025 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/4008918","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144767712","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Subgigawatt Level X-Band BWO Using Adiabatically Tapered SWS at Low Magnetic Field 低磁场下绝热锥形SWS的亚千兆瓦级x波段BWO

IF 1 4区工程技术

International Journal of RF and Microwave Computer-Aided Engineering Pub Date : 2025-07-31 DOI: 10.1155/mmce/9618627

Chitaranjan Jadab, Romesh Chandra, Sandeep Singh, Amitava Roy

{"title":"Subgigawatt Level X-Band BWO Using Adiabatically Tapered SWS at Low Magnetic Field","authors":"Chitaranjan Jadab, Romesh Chandra, Sandeep Singh, Amitava Roy","doi":"10.1155/mmce/9618627","DOIUrl":"https://doi.org/10.1155/mmce/9618627","url":null,"abstract":"Improving the efficiency of backward wave oscillators (BWOs) operating in a low magnetic field regime remains a significant research challenge. In this field regime, increased transverse motion of electrons leads to variable interaction impedance. Consequently, the beam wave synchronization with the desired mode is disrupted, resulting in reduced efficiency. To partially overcome this challenge, an adiabatically varying nonuniform slow wave structure (SWS) with a circular ridged wall profile is proposed. The SWS helps in maintaining the synchronization of the beam bunch with the desired normal mode throughout the interaction length. The circular SWS increases the field breakdown limit of the electrodynamic structure. This, in turn, results in an average output power of 810 MW at 9.8 GHz with a power increment of 50% compared to the uniform SWS, guided by a 0.6 T magnetic field. The low magnetic field operation helps in the implementation of a permanent magnet, which results in a repetitive microwave system. The novelty of this work lies in the use of an adiabatically tapered, nonuniform SWS geometry to ensure continuous synchronism at low magnetic fields, which is rarely addressed in conventional BWO designs. This method offers practical significance in reducing system size, weight, and cost by eliminating bulky electromagnets. Further efficiency enhancement is limited by overbunching, which induces Coulomb instability and leads to back-streaming of electrons, as observed in particle-in-cell simulation conducted using CST Microwave Studio.","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2025 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/9618627","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144751436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0