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

Compact Dual-Band Band-Pass Filter Using Single Multimode SIW Cavity With Independent Controllable Fractional Bandwidth 采用独立可控分数带宽的单模SIW腔的紧凑双带带通滤波器

IF 0.9 4区工程技术

International Journal of RF and Microwave Computer-Aided Engineering Pub Date : 2025-04-26 DOI: 10.1155/mmce/9968988

Ch. Suresh Kumar, Runa Kumari, Harish V. Dixit

引用次数: 0

Automatic Antenna Orientation Using the Algorithm Compatible With the Wireless Energy Harvesting System 兼容无线能量采集系统的天线自动定位算法

IF 0.9 4区工程技术

International Journal of RF and Microwave Computer-Aided Engineering Pub Date : 2025-04-26 DOI: 10.1155/mmce/8729956

Saeed Hosseini, Changiz Ghobadi, Javad Nourinia, Majid Shokri

{"title":"Automatic Antenna Orientation Using the Algorithm Compatible With the Wireless Energy Harvesting System","authors":"Saeed Hosseini, Changiz Ghobadi, Javad Nourinia, Majid Shokri","doi":"10.1155/mmce/8729956","DOIUrl":"https://doi.org/10.1155/mmce/8729956","url":null,"abstract":"In wireless telecommunication systems, the precise adjustment of the antenna direction has a direct effect on the quality of the received signal. In this article, a new routing algorithm is designed using the wireless energy harvesting (WEH) technology from electromagnetic waves to adjust the orientation of the receiver antenna. The algorithm is simulated for routing in TDD LTE cellular network at 2.35 GHz frequency. The proposed antenna in this article is a cross-dipole type with dual-polarization RHCP and LHCP, and its measured impedance bandwidths are 1.97–2.70 GHz at Port 1 and 1.96–2.72 GHz at Port 2. Also, 7.45 dBic peak gain and end-fire radiation capability of the proposed antenna are among the advantages of the automatic routing system. The proposed rectifier for WEH uses the voltage doubler technique. A new construction of microstrip elements has been used for the impedance matching network (IMN). The fabricated rectifier at 2.35 GHz can provide PCE = 52.8% at −0.5 dBm input power, which is suitable for WEH.","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2025 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/8729956","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143875653","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

Performance Evaluation of Wideband Dual Port Octagonal-Shaped Millimeter-Wave MIMO Antenna for Satellite Communication 卫星通信宽带双端口八角形毫米波MIMO天线性能评价

IF 0.9 4区工程技术

International Journal of RF and Microwave Computer-Aided Engineering Pub Date : 2025-04-22 DOI: 10.1155/mmce/1456913

Poonam Tiwari, Manoj Kumar Gaur, Meenu Kaushik, Anshuman Shastri, Bhupender Singh, Vishant Gahlaut

{"title":"Performance Evaluation of Wideband Dual Port Octagonal-Shaped Millimeter-Wave MIMO Antenna for Satellite Communication","authors":"Poonam Tiwari, Manoj Kumar Gaur, Meenu Kaushik, Anshuman Shastri, Bhupender Singh, Vishant Gahlaut","doi":"10.1155/mmce/1456913","DOIUrl":"https://doi.org/10.1155/mmce/1456913","url":null,"abstract":"A printed MIMO antenna specifically designed for small satellite communication has been presented in this paper. The antenna is invented of two radiators resonating at millimeter-wave and constructed using Rogers’s RT duroid 5880. The design includes two identical octagonal patches with a diamond-shaped slot and having two quadrilateral notches. These elements are placed over a substrate and connected to a microstrip transmission line that embeds a quarter-wave transformer. To establish the effectiveness of the MIMO antenna being proposed, a comparative analysis is conducted between its simulated and experimental performance. Each radiator in the antenna setup includes partial ground, which forms the back layer of the substrate. The design is simulated on the CST tool, and measurements are conducted on a Rohde and Schwarz vector network analyzer. The obtained results show a favorable level of agreement with the simulated outcomes, validating the effectiveness of the proposed MIMO antenna. The antenna design offers exceptional features such as wide bandwidth, self-isolated, high gain, and a directional radiation pattern while also supporting a wide frequency band, making it an ideal choice for 28 GHz band applications. The performance of MIMO antennas in diversity can be determined using parameters such as envelope correlation coefficient (ECC), diversity gain (DG), and total active reflection coefficient (TARC). Satellite communication will be improved by implementing the suggested MIMO antenna through upgrading small satellite communication systems.","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2025 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/1456913","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143856897","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 Floral-Like Fractal Ultra-Wideband Flexible Antenna for Wearable Device 一种用于可穿戴设备的花朵形超宽带柔性天线

IF 0.9 4区工程技术

International Journal of RF and Microwave Computer-Aided Engineering Pub Date : 2025-04-22 DOI: 10.1155/mmce/8057773

Xiaoying Ran, Zhen Yu, Ruirong Niu, Yi Chang, Feng Wang

{"title":"A Floral-Like Fractal Ultra-Wideband Flexible Antenna for Wearable Device","authors":"Xiaoying Ran, Zhen Yu, Ruirong Niu, Yi Chang, Feng Wang","doi":"10.1155/mmce/8057773","DOIUrl":"https://doi.org/10.1155/mmce/8057773","url":null,"abstract":"In the context of the rapid development of wireless body area network and ultra-wideband technology, this design puts forward a new structure of ultra-wideband flexible antenna. Its operating band is 1.22–8.82 GHz, with a maximum gain of 4.8 dBi. The antenna adopts a polyimide material with a relative dielectric constant of 3.5 and a thickness of 0.2 mm as the dielectric substrate. The overall size of the antenna is very small, measuring 0.15λ × 0.21λ at the lowest frequency of 1.22 GHz. In this paper, the influence of some antenna parameters on its performance, the influence of different bending conditions on the performance of the antenna, and the specific absorptivity of the antenna to the human body are discussed. In order to further explore the performance stability of the antenna, the performance of the antenna under right-angle bending is simulated and tested in this paper. Simulation results show that the antenna still has two frequency bands 1.22–2.58 GHz and 3.35–9.53 GHz under right-angle bending, which can still cover most of the commercial communication bands, and the measured results are in good agreement with the simulation results. Therefore, the antenna has strong adaptability and damage resistance and can be used in wearable equipment for military or emergency rescue.","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2025 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/8057773","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143861546","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 Single-Cavity X/Ku/Ka/W Quad-Band Feed Horn With 10-to-1 Spaced Bands for Satellite Communications 用于卫星通信的具有 10 比 1 波段间隔的单腔 X/Ku/Ka/W 四波段馈源喇叭筒

IF 0.9 4区工程技术

International Journal of RF and Microwave Computer-Aided Engineering Pub Date : 2025-04-21 DOI: 10.1155/mmce/2635138

Xiang Fang, Fayu Wan, Jiayi Fan, Rui Wang

引用次数: 0

Corrigendum to “A Lumped-Element Directional Coupler for Bandwidth Enhancement, Impedance Matching, and Harmonic Suppressions” “用于带宽增强、阻抗匹配和谐波抑制的集总元件定向耦合器”的勘误表

IF 0.9 4区工程技术

International Journal of RF and Microwave Computer-Aided Engineering Pub Date : 2025-04-15 DOI: 10.1155/mmce/9817531

引用次数: 0

An Ultrawideband Stacked Structure Metasurface Incorporating Rotational Slots for the Reduction of Backward RCS 一种结合旋转槽的超宽带堆叠结构超表面，用于减少反向RCS

IF 0.9 4区工程技术

International Journal of RF and Microwave Computer-Aided Engineering Pub Date : 2025-04-12 DOI: 10.1155/mmce/3956474

Boli Su, Ke Guan, An Qian, Jianxian Cai, Lanying Zhao

引用次数: 0

Physics-Informed Extreme Learning Machine Applied for Eigenmode Analysis of Waveguides and Transmission Lines 基于物理的极限学习机在波导和传输线本征模分析中的应用

IF 0.9 4区工程技术

International Journal of RF and Microwave Computer-Aided Engineering Pub Date : 2025-03-31 DOI: 10.1155/mmce/6233356

Li Huang, Liang Chen, Rongchuan Bai

{"title":"Physics-Informed Extreme Learning Machine Applied for Eigenmode Analysis of Waveguides and Transmission Lines","authors":"Li Huang, Liang Chen, Rongchuan Bai","doi":"10.1155/mmce/6233356","DOIUrl":"https://doi.org/10.1155/mmce/6233356","url":null,"abstract":"In this work, we propose a physics-informed extreme learning machine (PIELM) method to identify the eigenmode field distributions of waveguides and transmission lines by solving Helmholtz partial differential equation (PDE) with initial and boundary conditions. A single-layer neural network architecture is adopted in PIELM, where the input layer parameters are initialized randomly. By embedding physics-informed constraints into the loss function, a system matrix equation can be established. Then, the output layer weights can be learned with the Moore–Penrose generalized inverse algorithm. Compared with physics-informed neural network (PINN), PIELM only uses a single-layer feedforward neural network and does not engage in an iterative optimization process utilizing backpropagation and gradient descent algorithms. As a result, the time spent on model training is reduced significantly, with the total process accelerated. Some numerical examples are presented to validate both accuracy and efficiency of PIELM method compared with PINN method in solving the eigenmode field distribution problem of waveguides and transmission lines.","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2025 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/6233356","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143741521","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

An Improved Filtering Power Divider Using Substrate Integrated Waveguide for Ku-Band Satellite Applications 基于基板集成波导的ku波段卫星滤波功率分压器

IF 0.9 4区工程技术

International Journal of RF and Microwave Computer-Aided Engineering Pub Date : 2025-03-31 DOI: 10.1155/mmce/5905191

Mai Van Ta, Nguyen Tuan Hung, Kieu Khac Phuong, Tran Thi Thu Huong, Nguyen Thuy Linh, Ta Chi Hieu, Luong Duy Manh

{"title":"An Improved Filtering Power Divider Using Substrate Integrated Waveguide for Ku-Band Satellite Applications","authors":"Mai Van Ta, Nguyen Tuan Hung, Kieu Khac Phuong, Tran Thi Thu Huong, Nguyen Thuy Linh, Ta Chi Hieu, Luong Duy Manh","doi":"10.1155/mmce/5905191","DOIUrl":"https://doi.org/10.1155/mmce/5905191","url":null,"abstract":"This paper presents an improved design of a Ku-band power divider (PD) based on a substrate integrated waveguide (SIW) technology. The design is aimed at using the block upconverter (BUC) of the Ku-band satellite communication system. The PD has been developed to operate in the frequency range of 13.75–14.5 GHz for low-loss, good isolation, and good amplitude and phase imbalances for both power dividing and combining. To increase the isolation between output ports, TE102 mode is selected to operate in the main cavity while the coupled cavity operates in the TE101 mode. Low insertion loss of the PD can be achievable by determining Q factor of the SIW cavities. In addition, good phase and amplitude imbalances can also be obtained by making a suitable arrangement of the input and output ports. The measured results at the center frequency of 14.12 GHz exhibit an insertion loss of 1.3 dB, return loss of 16.9 dB, isolation of 16 dB, amplitude imbalance of 1.2 dB, and phase imbalance of 2.8°. The simulations are consistent with the measurements, validating the accuracy of the proposed method. The proposed PD can be a promising candidate for use in the BUC of the Ku-band satellite systems.","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2025 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/5905191","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143741520","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

Dual-Band MIMO Dipole With Integrated Balun and Optimized Algorithm-Based Decoupling Structure 集成Balun的双频MIMO偶极子与优化算法解耦结构

IF 0.9 4区工程技术

International Journal of RF and Microwave Computer-Aided Engineering Pub Date : 2025-03-26 DOI: 10.1155/mmce/6465774

Amir Hatamian, Javad Nourinia, Changiz Ghobadi

{"title":"Dual-Band MIMO Dipole With Integrated Balun and Optimized Algorithm-Based Decoupling Structure","authors":"Amir Hatamian, Javad Nourinia, Changiz Ghobadi","doi":"10.1155/mmce/6465774","DOIUrl":"https://doi.org/10.1155/mmce/6465774","url":null,"abstract":"This work presents a multiple-input/multiple-output (MIMO) antenna consisting of dipoles with integrated baluns and a parasitic element to reduce mutual coupling, which can cover two frequency bands. The configuration of the decoupling element is determined by using an optimization algorithm. The algorithm takes nine physical dimensions of the decoupling element as input and adjusts them by minimizing a cost function. One of these decision variables (DVs) is the number of decoupling element’s stairs (steps), which is a discrete parameter. In its simple form, the antenna cannot obtain proper isolation in the low-frequency band, which has been solved by employing a decoupling structure in the middle of the antenna. The experimental results show that the antenna has impedance bandwidths of 1.95–3.50 GHz and 3.98–5.67 GHz, providing minimum isolation of 13.1 and 19.5 dB in the low- and high-frequency bands, respectively. The ECC value is lower than 0.0038, and the peak gains are equal to 4.4 and 5.21 dB for the low- and high-frequency bands. The main contribution of this work is the design of the decoupling element, which, considering the antenna’s characteristics, has improved the antenna’s isolation by 12.4 dB only in the center of the low-frequency band.","PeriodicalId":54944,"journal":{"name":"International Journal of RF and Microwave Computer-Aided Engineering","volume":"2025 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1155/mmce/6465774","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698910","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