International Journal of Antennas and Propagation最新文献_第7页

Analysis of C-V2X Antenna Performance on Vehicular Panoramic Glass 车载全景玻璃上C-V2X天线性能分析

4区计算机科学

International Journal of Antennas and Propagation Pub Date : 2023-10-10 DOI: 10.1155/2023/6622850

Ahmad S. Ibrahim, Daniel N. Aloi, Amanpreet Kaur

{"title":"Analysis of C-V2X Antenna Performance on Vehicular Panoramic Glass","authors":"Ahmad S. Ibrahim, Daniel N. Aloi, Amanpreet Kaur","doi":"10.1155/2023/6622850","DOIUrl":"https://doi.org/10.1155/2023/6622850","url":null,"abstract":"This paper presents an analysis of a cellular vehicle-to-everything (C-V2X) quarter-wavelength monopole antenna performance when mounted on full glass roof. Antenna gain measurements performed on a full glass roof exhibited a performance degradation in a linear average gain (LAG) of 8 dB compared to when the same antenna is mounted on a metallic ground plane. In addition, the antenna radiation pattern on the glass roof had deep nulls. Due to a lack of information about the electrical material properties and architecture of the full glass roof sample from the glass supplier for proprietary reasons, a series of gain measurements were performed for the C-V2X monopole when mounted on different glass material samples. The measurement findings suggested the existence of a metal layer in the glass roof sample. Based on this information, the antenna was simulated using a full-wave, three-dimensional electromagnetic field solver on the full glass sample with a low-emissivity (low-E) coating on the edges of the full glass roof. The simulation results showed acceptable agreement with the measurements. A practical solution is suggested to improve the C-V2X antenna performance on the full glass roof. Specific absorption ratio (SAR) analysis is conducted for the passengers in the front and rear seats due to the passenger radiation exposure from the C-V2X monopole antenna mounted on the glass roof. The SAR study showed that the effect of the roof-top C-V2X monopole antenna radiation on the passengers is negligible.","PeriodicalId":54392,"journal":{"name":"International Journal of Antennas and Propagation","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136353098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Robust Symbol-Level Precoding Method for Multibeam Satellite Systems 多波束卫星系统的鲁棒符号级预编码方法

4区计算机科学

International Journal of Antennas and Propagation Pub Date : 2023-10-10 DOI: 10.1155/2023/8851758

Qi Wang, Wuyang Zhou

{"title":"A Robust Symbol-Level Precoding Method for Multibeam Satellite Systems","authors":"Qi Wang, Wuyang Zhou","doi":"10.1155/2023/8851758","DOIUrl":"https://doi.org/10.1155/2023/8851758","url":null,"abstract":"Compared to interference mitigating precoding, interference exploiting symbol-level precoding (SLP) requires less transmit power to guarantee the quality of service in a multibeam satellite system. However, due to the large roundtrip time (RTT), it is impractical to obtain real-time channel state information on the satellite side. The random channel state information (CSI) phase error of outdated CSI could cause serious performance deterioration of SLP. To compensate the CSI phase error, we propose an outdated CSI-based robust SLP (RSLP) method, which optimizes the transmit power under outage probability constraints. The central limit theorem (CLT) and second-order Taylor expansion are used to relax the outage probability constraints into convex ones. In addition, because only outdated CSI-based robust block-level precoding exists, we present two comparative RSLP methods accordingly. Without violating outrage probability constraints, the proposed RSLP method requires much lower transmit power than comparative RSLP and existing robust block-level precoding methods. The complexity of the proposed RSLP method is also lower than that of two comparative RSLP methods.","PeriodicalId":54392,"journal":{"name":"International Journal of Antennas and Propagation","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136353590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Novel Meandered Line EBG Filters with Significant Size Reduction Using Sine Tapering 新型曲线形EBG滤波器显著减小使用正弦渐缩

4区计算机科学

International Journal of Antennas and Propagation Pub Date : 2023-10-04 DOI: 10.1155/2023/6457969

S. M. Shakil Hassan, Kalyan Kumar Halder, Md. Nurunnabi Mollah

引用次数: 0

A Flexible Wearable Antenna with Annular Solar Eclipse Structure for ISM/WLAN/WIMAX/Bluetooth Applications 一种适用于ISM/WLAN/WIMAX/蓝牙应用的具有日环食结构的柔性可穿戴天线

4区计算机科学

International Journal of Antennas and Propagation Pub Date : 2023-10-04 DOI: 10.1155/2023/8969565

Zhen Yu, Runzhi Sun, Guodong Zhang, Ruirong Niu, Xiaoying Ran, Ziheng Lin

{"title":"A Flexible Wearable Antenna with Annular Solar Eclipse Structure for ISM/WLAN/WIMAX/Bluetooth Applications","authors":"Zhen Yu, Runzhi Sun, Guodong Zhang, Ruirong Niu, Xiaoying Ran, Ziheng Lin","doi":"10.1155/2023/8969565","DOIUrl":"https://doi.org/10.1155/2023/8969565","url":null,"abstract":"This paper proposes a wearable flexible dual-band antenna that covers the 2.34–2.68 GHz and 4.05–5.26 GHz frequency bands. This antenna employs a novel nested imitation annular solar eclipse structure, where the main radiator is a gradually widening loop, and another loop is coupled inside the radiator. The antenna, with overall dimensions of 40\u0000 \u0000 ∗\u0000 \u0000 32\u0000 \u0000 ∗\u0000 \u0000 0.3 mm³, utilizes polyimide as the dielectric material. The gain, efficiency, and cross-polarization of the antenna were tested using a microwave anechoic chamber. The antenna achieves a maximum gain of 6 dBi and a maximum efficiency of 79.6%. We tested the SAR of the antenna at 10 mm from the human body, which was significantly below the international standard of 2.0 W/kg. The flexible antenna presented in this paper exhibits a broad low-frequency bandwidth, enabling coverage of various communication bands such as ISM, WLAN, WIMAX, and Bluetooth. The antenna delivers satisfactory simulation and measurement results while meeting the requirements of minimizing radiation exposure to the human body.","PeriodicalId":54392,"journal":{"name":"International Journal of Antennas and Propagation","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135590441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultra-Wideband Fractal Ring Antenna for Biomedical Applications 生物医学应用的超宽带分形环形天线

4区计算机科学

International Journal of Antennas and Propagation Pub Date : 2023-09-28 DOI: 10.1155/2023/5515263

Ilyas Saleem, Umair Rafique, Shobit Agarwal, Hüseyin Şerif SAVCI, Syed Muzahir Abbas, Subhas Mukhopadhyay

引用次数: 1

Fabrication of a Flexible RFID Antenna by Using the Novel Environmentally Friendly Additive Process 利用新型环保添加剂工艺制备柔性RFID天线

4区计算机科学

International Journal of Antennas and Propagation Pub Date : 2023-09-27 DOI: 10.1155/2023/8477138

Pandi Divya, Wen-Hsi Lee

{"title":"Fabrication of a Flexible RFID Antenna by Using the Novel Environmentally Friendly Additive Process","authors":"Pandi Divya, Wen-Hsi Lee","doi":"10.1155/2023/8477138","DOIUrl":"https://doi.org/10.1155/2023/8477138","url":null,"abstract":"The fabrication of flexible antennas for RFID applications can be divided into subtractive and additive methods. In this study, a low-cost additive method is proposed, which involves printing aluminum paste and utilizing a galvanic replacement reaction. Through a galvanic replacement process, copper sulfate waste effluent was employed to convert the aluminum electrode into a highly conductive copper electrode. The physical characteristics of the Cu electrode, such as surface flatness, thickness, and Al-Cu conversion ratio, were studied. The Cu electrode, produced using an innovative additive technique at a temperature of 75°C for 15 minutes, exhibits the lowest resistivity of 5.89 × 10–8 Ωm. This resistivity is comparable to that of a commercial silver thick film electrode, making it suitable for use in manufacturing RFID antennas for RFID module applications. With an S11 of −40 dB at 1.26 GHz, a maximum gain of 2.87 dBi, a maximum efficiency of 53.63%, and a reading distance of 9 meters, the RFID module demonstrates impressive performance. The reading distance of an RFID module with a copper foil antenna is longer (8.5 meters).","PeriodicalId":54392,"journal":{"name":"International Journal of Antennas and Propagation","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135535236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An Asymmetrical Mixed Higher-Order Discontinuous Galerkin Time Domain Method for Electromagnetic Scattering from the Plasma Sheath around a Hypersonic Vehicle 高超声速飞行器等离子体鞘层电磁散射的非对称混合高阶不连续伽辽金时域方法

4区计算机科学

International Journal of Antennas and Propagation Pub Date : 2023-09-26 DOI: 10.1155/2023/6223384

Jirong Guo, Yiping Han

{"title":"An Asymmetrical Mixed Higher-Order Discontinuous Galerkin Time Domain Method for Electromagnetic Scattering from the Plasma Sheath around a Hypersonic Vehicle","authors":"Jirong Guo, Yiping Han","doi":"10.1155/2023/6223384","DOIUrl":"https://doi.org/10.1155/2023/6223384","url":null,"abstract":"The plasma sheath during reentry of hypersonic vehicle is an unmagnetized and weakly ionized nonuniform plasma flow, which causes radio frequency blackout and strong plasma attenuation of electromagnetic wave. The physical properties of the nonuniform plasma flow were obtained using computational fluid dynamics software with unstructured grids. In this study, a detailed computational model was reconstructed with the high-order Lagrange grids for the nonuniform plasma flow region and the high-order Serendipity grids for the homogeneous medium region. In order to calculate the numerical flux between the two types of grids in the discontinuous Galerkin time domain (DGTD) algorithm, an asymmetric high-order element is constructed as a transition unit. Finally, the simulation results in the plasma sphere show that the above method improves the computational accuracy and decreases calculation. The amplitude and scattering about electromagnetic wave in nonuniform plasma flow are clarified in detail. It is suggested that the presented method could be an effective tool for investigating interaction between electromagnetic waves and plasma flow.","PeriodicalId":54392,"journal":{"name":"International Journal of Antennas and Propagation","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134887152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Compact Broad Circularly Polarized Cross-Dipole Antenna with Grounded Parasitic Elements 具有接地寄生元件的紧凑型宽圆极化交叉偶极子天线

4区计算机科学

International Journal of Antennas and Propagation Pub Date : 2023-09-21 DOI: 10.1155/2023/9359671

Dong Yang, Lichao Hao, Lei Wang

{"title":"A Compact Broad Circularly Polarized Cross-Dipole Antenna with Grounded Parasitic Elements","authors":"Dong Yang, Lichao Hao, Lei Wang","doi":"10.1155/2023/9359671","DOIUrl":"https://doi.org/10.1155/2023/9359671","url":null,"abstract":"A new wideband cross-dipole antenna (CDA) with a circularly polarized (CP) characteristic is proposed in this article. The antenna consists of four L-shaped patches, two modified trapezoid-microstrip lines as an impedance tuner, a pair of vacant-quarter feeding loops as a continuous-phase feeding network, and four grounded inverted L-shaped strips as parasitic elements. It is noticed that the grounded inverted L-shaped strips are inserted directly below the L-shaped patches to increase the CP bandwidth and enhance the gains of the antenna, which is different from the conventional parasitic elements. First, a pair of vacant-quarter feeding loops is used as a feeding structure to provide a sequential phase characteristic. Second, four L-shaped patches as driven elements are connected to the feeding structure to excite two CP resonant modes. Third, two modified trapezoid-microstrip lines are inserted into the feeding structure to adjust the impedance match. Moreover, four grounded inverted L-shaped strips are introduced into the square reflector to achieve wider CP operation by utilizing a gap capacitive coupling feeding way. Finally, the proposed antenna is simulated, manufactured, and measured to verify the design rationality. The measured results indicate the proposed antenna has a broad 3-dB ARBW of 82.5% (1.38–3.32 GHz, 2.35 GHz) and a wide −10-dB IBW of 81.2% (1.18–3.04 GHz, 2.29 GHz). Furthermore, the measured and simulated CP bandwidths are 75.1% (1.38–3.04 GHz, 2.21 GHz) and 74.7% (1.36–2.98 GHz, 2.17 GHz), which is suitable for CP applications in WiBro (2.3–2.39 GHz) and GPS (L1 1.575 GHz) bands.","PeriodicalId":54392,"journal":{"name":"International Journal of Antennas and Propagation","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136130729","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simple Matrix Equation (SME) Method for Pattern Synthesis of Conformal Antenna Array with Arbitrary Architecture 任意结构共形天线阵方向图综合的简单矩阵方程法

4区计算机科学

International Journal of Antennas and Propagation Pub Date : 2023-09-14 DOI: 10.1155/2023/9153483

Jie Chen

引用次数: 0

A Multi-Polarized Reconfigurable Plasma Antenna Array 多极化可重构等离子体天线阵列

4区计算机科学

International Journal of Antennas and Propagation Pub Date : 2023-09-11 DOI: 10.1155/2023/3008738

Zhen Sun, Zhenzhen Zhou, Zhihao Tan, Huafeng Wu, Jiansen Zhao

{"title":"A Multi-Polarized Reconfigurable Plasma Antenna Array","authors":"Zhen Sun, Zhenzhen Zhou, Zhihao Tan, Huafeng Wu, Jiansen Zhao","doi":"10.1155/2023/3008738","DOIUrl":"https://doi.org/10.1155/2023/3008738","url":null,"abstract":"Research on antenna reconfiguration is important in antenna applications. We present design of a multi-polarized plasma antenna with 40.68 MHz radio frequency (RF) power supplies and several discharge tubes filled with argon (neon) and mercury. Furthermore, self-made regulating circuits among the vibrators are introduced for the antenna array system. It can not only make the length of the dipole controllable but also improve the antenna gain and circular polarization (CP) performance under different lengths. Antenna arrays can be classified into linear and circular polarization by quickly adjusting the phase difference between vibrators. Both the experimental and simulation results indicate that the plasma antenna can realize impedance, pattern, and polarization reconstruction expediently. In addition, the linear polarization (LP) and CP can be transformed into each other quickly by adjusting the discharge conditions and regulating circuits. Moreover, compared with a symmetrical cross vibrator plasma antenna and a metal antenna of the same size, the proposed antenna array shows a certain gain and good reconfigurable performance within the frequency band of 150–250 MHz.","PeriodicalId":54392,"journal":{"name":"International Journal of Antennas and Propagation","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135982388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0