Radio Science最新文献_第7页

Quad ports millimeter-wave MIMO antenna with parasitic element and defected ground structure for radar sensing application 四端口毫米波MIMO天线的寄生元件和缺陷的地面结构的雷达传感应用

IF 1.6 4区地球科学

Radio Science Pub Date : 2025-03-01 DOI: 10.1029/2024RS008174

Muhammad Irshad Khan;Muhammad Kabir Khan;Saeed Ur Rahman;Muhammad Anab;Abdul Basit

{"title":"Quad ports millimeter-wave MIMO antenna with parasitic element and defected ground structure for radar sensing application","authors":"Muhammad Irshad Khan;Muhammad Kabir Khan;Saeed Ur Rahman;Muhammad Anab;Abdul Basit","doi":"10.1029/2024RS008174","DOIUrl":"https://doi.org/10.1029/2024RS008174","url":null,"abstract":"This paper presents a quad-element MIMO antenna with a novel decoupling structure for mm-wave 5G radar sensing applications. The proposed MIMO antenna is fabricated on Rogers RT/5880, which is suitable for high frequency communication. Furthermore, effective techniques for novel parasitic elements and a defected ground structure (DGS) are introduced to minimize inter-element coupling in the required bandwidth. The parasitic element consists of a square ring and a four-line parasitic. The ring parasitic is rotated 45° anticlockwise and line parasitic elements are rotated 5° from the original position to obtain the proposed design. The line parasitic elements coupled from adjacent elements and square ring parasitic neutralize current. The DGS is introduced to enhance isolation further. The slot is inserted in the center of the ground plane. Two rectangular slots are also inserted to isolate adjacent elements. The edge-to-edge space between the radiation elements is 5.6 mm. The antenna exhibits S11 of <—10>9.99 dB and multiplexing efficiency is —0.5 dB within the given bandwidth. The multiplexing efficiency, radiation pattern, ECC, DG, and peak gain are also calculated and evaluated for practical authentication.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"60 3","pages":"1-12"},"PeriodicalIF":1.6,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Front matters 前面问题

IF 1.6 4区地球科学

Radio Science Pub Date : 2025-03-01 DOI: 10.1002/rds.21327

引用次数: 0

Simulation-based channel modeling at 28 GHz for different vehicular traffic densities in vehicle-to-vehicle scenarios 针对车对车场景中不同交通密度的28 GHz基于仿真的信道建模

IF 1.6 4区地球科学

Radio Science Pub Date : 2025-03-01 DOI: 10.1029/2024RS008155

Jiajing Chen;Mingran Sun;Lu Bai;Xiang Cheng;Xuesong Cai

{"title":"Simulation-based channel modeling at 28 GHz for different vehicular traffic densities in vehicle-to-vehicle scenarios","authors":"Jiajing Chen;Mingran Sun;Lu Bai;Xiang Cheng;Xuesong Cai","doi":"10.1029/2024RS008155","DOIUrl":"https://doi.org/10.1029/2024RS008155","url":null,"abstract":"Vehicle-to-Vehicle (V2V) communications have received a lot of attention as it can significantly improve efficiency and safety of road traffic. This paper introduces a novel data set, constructed at urban crossroads in different vehicular traffic densities (VTDs) for line-of-sight (LOS) and non-line-of-sight (NLOS) scenarios, utilizing Ray-tracing techniques for its development. Channel modeling was performed for the path loss, shadowing, and multipath characteristics of the propagation channel, that is, the root-mean-square delay spread, azimuth of arrival (AoA) spread and elevation of arrival (EoA) spread, correlations of spreads, and coherent distances of spreads of interest. The simulation results indicate that scenarios with low and medium VTD exhibit lower path loss and delay spread values compared to scenarios with high VTD. The AoA spread is significantly larger in the LOS scenarios compared to the NLOS scenarios, and the EoA spread demonstrates greater variations with different VTDs in both the LOS and the NLOS conditions. These results are important for generating realistic channel realizations for the design and performance evaluation of V2V communication algorithms in the context of the sixth-generation (6G) wireless networks.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"60 5","pages":"1-10"},"PeriodicalIF":1.6,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144213611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design procedure for interdigital waveguide bandpass filters based on flat metallic strips 基于平面金属条的数字间波导带通滤波器的设计程序

IF 1.6 4区地球科学

Radio Science Pub Date : 2025-03-01 DOI: 10.1029/2024RS008195

R. García;A. A. San-Blas;S. Bonte;A. Coves;M. A. Sánchez-Soriano;M. Guglielmi;V. E. Boria

{"title":"Design procedure for interdigital waveguide bandpass filters based on flat metallic strips","authors":"R. García;A. A. San-Blas;S. Bonte;A. Coves;M. A. Sánchez-Soriano;M. Guglielmi;V. E. Boria","doi":"10.1029/2024RS008195","DOIUrl":"https://doi.org/10.1029/2024RS008195","url":null,"abstract":"In this work, we describe a new topology for interdigital bandpass filters implemented in waveguide technology. Compared to classical coaxial resonators, which are typically based on cylindrical metallic posts, the resonators that we propose are based on rectangular boxed cavities loaded with flat metallic strips of a finite thickness. The main advantages of the proposed topology are low-cost practical realization and manufacture simplicity. The design process, which is based on the classical circuit-based approach combined with an efficient segmentation of the component, uses the well-known Aggressive Space Mapping technique, with the aim of reducing the overall computation effort. In order to validate the new topology and the design procedure, interdigital bandpass filters of orders 3 and 5 operating at the S-band have been designed. For validation purposes, the results obtained are successfully compared to simulations provided by two different full-wave electromagnetic tools (i.e., Ansys HFSS and CST Studio Suite). Furthermore, a multipactor study has also been performed, with the aim of exploring the power handling capability of the proposed filters in view of possible space applications. Finally, the design of classical interdigital filters based on cylindrical posts is also discussed, with the aim of comparing both topologies regarding compactness, as well as in terms of their electrical and high-power performance.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"60 3","pages":"1-13"},"PeriodicalIF":1.6,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Automatic scaling of vertical ionograms based on generative adversarial network 基于生成对抗网络的垂直电离图自动缩放

IF 1.6 4区地球科学

Radio Science Pub Date : 2025-03-01 DOI: 10.1029/2024RS008123

Wen Liu;Xinxin Huang;Na Wei;Zhongxin Deng

{"title":"Automatic scaling of vertical ionograms based on generative adversarial network","authors":"Wen Liu;Xinxin Huang;Na Wei;Zhongxin Deng","doi":"10.1029/2024RS008123","DOIUrl":"https://doi.org/10.1029/2024RS008123","url":null,"abstract":"Ionospheric vertical sounding is a well-established and widely used ground-based technique for ionospheric detection. Efficient and accurate automatic scaling of ionograms is crucial for real-time applications of vertical sounding. However, current scaling methods face challenges in achieving precise trace segmentation due to noise, interference, and various ionospheric disturbances. This paper proposes a deep learning model for ionogram automatic scaling based on generative adversarial network (GAN), which is named IASGAN. The model integrates a 50-layer residual network (ResNet50) and a feature pyramid network (FPN) as the generator, with a multi-layer convolutional neural network (CNN) as the discriminator. Given a vertical ionogram, the generator produces segmentation result that closely resemble the corresponding label, while the discriminator provides feedback loss to the generator for adversarial training, thereby enhancing the segmentation performance of the generator. Experimental results demonstrate that the IASGAN model can precisely and effectively autoscale E, FI, and F2 layer traces. Compared to existing scaling methods, the IASGAN model can produce finer trace extraction from ionograms, with a mean maximum critical frequency absolute deviation (D-MCF) of 0.0803 MHz and a mean minimum virtual height absolute deviation (D-MEH) of 5.8205 km. This capability can provide technical support for the extraction of characteristic parameters and ionospheric inversion, which is significant for real-time acquisition of ionospheric characteristics and structure information.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"60 3","pages":"1-11"},"PeriodicalIF":1.6,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Secrecy sum rate maximization of RIS assisted downlink NOMA system RIS辅助下行NOMA系统的保密和速率最大化

IF 1.6 4区地球科学

Radio Science Pub Date : 2025-02-01 DOI: 10.1029/2024RS008011

Zhitao Liu;Yongkang Peng;Youming Li;Yongfeng Du

引用次数: 0

Front matters 前面问题

IF 1.6 4区地球科学

Radio Science Pub Date : 2025-02-01 DOI: 10.1002/rds.21326

引用次数: 0

A low ionosphere occultation observation method based on differential weight separation 基于差重分离的低电离层掩星观测方法

IF 1.6 4区地球科学

Radio Science Pub Date : 2025-02-01 DOI: 10.1029/2024RS008152

Jialiang Zhong;Sijia Han;Caiyun Wang;Wei Guo

引用次数: 0

Monitoring global ionospheric conditions with electromagnetic lightning impulses registered in extremely low frequency measurements 用极低频测量记录的电磁闪电脉冲监测全球电离层状况

IF 1.6 4区地球科学

Radio Science Pub Date : 2025-02-01 DOI: 10.1029/2024RS008140

Z. Nieckarz;M. Golkowski;J. Kubisz;M. Ostrowski;A. Michalec;J. Mlynarczyk;J. Lichtenberger;A. Maxworth

{"title":"Monitoring global ionospheric conditions with electromagnetic lightning impulses registered in extremely low frequency measurements","authors":"Z. Nieckarz;M. Golkowski;J. Kubisz;M. Ostrowski;A. Michalec;J. Mlynarczyk;J. Lichtenberger;A. Maxworth","doi":"10.1029/2024RS008140","DOIUrl":"https://doi.org/10.1029/2024RS008140","url":null,"abstract":"The Extremely Low Frequency band (ELF: 0.03-1,000 Hz) electromagnetic signals from thunderstorm lightning discharges can propagate around the globe in the Earth-ionosphere resonance cavity and thus be used for ionosphere monitoring. We use ELF observations of impulses detected by the World Wide Lightning Location Network (WWLLN) to investigate ELF propagation velocity and arrival azimuth under diurnal changes over 2 days in September 2023. Also, temporary effects of solar flares' ionizing fluxes are monitored, leading to increase of the ELF signal propagation speed in proportion to the X-ray flux intensity. We present a simple method for automatic and large-scale analysis, utilizing data from two registration systems (our ELF reciever and WWLLN) and enabling easy evaluation of changes in wave propagation speed. Comparative analysis of WWLLN identified impulses generated in Africa and America reveals varying effects of signal refraction, with increased azimuth changes for signals propagating across the ionospheric ionization gradients associated with the day/night terminator. The method has a potential to become a standard tool for the analysis and monitoring of the lower layers of the ionosphere.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"60 2","pages":"1-9"},"PeriodicalIF":1.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143535533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Burj Khalifa-inspired reconfigurable microstrip patch antenna for wireless solutions 受哈利法塔启发的可重构微带贴片天线，用于无线解决方案

IF 1.6 4区地球科学

Radio Science Pub Date : 2025-02-01 DOI: 10.1029/2024RS008114

J. Salah;M. Madi;M. El Abbasi;M. Moussa;A. Daher;M. Hussein;K. Kabalan

{"title":"Burj Khalifa-inspired reconfigurable microstrip patch antenna for wireless solutions","authors":"J. Salah;M. Madi;M. El Abbasi;M. Moussa;A. Daher;M. Hussein;K. Kabalan","doi":"10.1029/2024RS008114","DOIUrl":"https://doi.org/10.1029/2024RS008114","url":null,"abstract":"This paper presents a new microstrip patch antenna inspired by the iconic Burj Khalifa, Dubai's world's tallest skyscraper. The antenna design focuses on being compact, lightweight, cost-effective, and versatile. Simulated through HFSS software, the patch antenna demonstrates a multi-frequency operation. Fabricated on a double-sided copper FR4 epoxy PCB (4 × 8 cm<sup>2</sup>, 1.6 mm thickness) using a coaxial probe feeding method, it achieves a gain exceeding 7 dB at 7 GHz. Prototypes show excellent consistency between measured and simulated reflection coefficients and gains at 4.8, 5.7, and 7 GHz. Two additional designs are presented to adjust the resonance frequency, making it suitable for biomedical sensors, WIFI, and point-to-point microwave links. One design involves adding a short slot that is close to the feed point, while the other design includes a pair of varactors. Both designs create a reconfigurable microstrip antenna with electromagnetic characteristics that can be adjusted to increase its electrical length. The antenna resonates at 4.8 GHz. The slotted short patch shifts the resonance to 3.1 GHz, and the varactor patch shifts the resonance frequency to 2.1 GHz. When the DC reverse bias voltage of the varactors varies from 0 to 6 V, the gain improves to 15.2 dB.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"60 2","pages":"1-15"},"PeriodicalIF":1.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143535449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0