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Dual-band circular polarized microstrip antenna for GNSS application 用于全球导航卫星系统的双频圆极化微带天线
IF 1.1 4区 工程技术
Frequenz Pub Date : 2024-02-14 DOI: 10.1515/freq-2023-0132
Haiyang Wang, Bianmei Zhang, Xiaoming Liu, Xiaofan Yang, Ran Zhang, Ye Wang
{"title":"Dual-band circular polarized microstrip antenna for GNSS application","authors":"Haiyang Wang, Bianmei Zhang, Xiaoming Liu, Xiaofan Yang, Ran Zhang, Ye Wang","doi":"10.1515/freq-2023-0132","DOIUrl":"https://doi.org/10.1515/freq-2023-0132","url":null,"abstract":"A dual-band circular polarized antenna with broad bandwidth is proposed. Two circular grooves with different radii are carved on the ground to generate two frequency bands. Two rectangular slots are engraved on the outside of the circular groove. By adjusting the length of the two slots, this antenna can radiate right-handed circularly polarized (RHCP) waves at two frequency bands, which can cover GPS <jats:italic>L</jats:italic>5 (1.176 GHz), <jats:italic>L</jats:italic>2 (1.227 GHz), <jats:italic>L</jats:italic>1 (1.575 GHz), BDS, GALILEO, and GLONASS bands. The measured −10 dB bandwidth is 46.3 % (1.13–1.81 GHz) and 3 dB axial ratio bandwidths are 15.6 % (1.11–1.30 GHz) and 17.8 % (1.38–1.65 GHz). The measured gains are 2.51 dBi and 2.67 dBi at 1.2 GHz and 1.56 GHz, respectively.","PeriodicalId":55143,"journal":{"name":"Frequenz","volume":"7 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139752397","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}
引用次数: 0
High gain and high-efficiency compact resonator antennas based on spoof surface plasmon polaritons 基于欺骗性表面等离子体极化子的高增益、高效率紧凑型谐振器天线
IF 1.1 4区 工程技术
Frequenz Pub Date : 2024-02-14 DOI: 10.1515/freq-2023-0164
Dou Tian, Amin Kianinejad, Jiafu Wang, Chen Guo, Anxue Zhang
{"title":"High gain and high-efficiency compact resonator antennas based on spoof surface plasmon polaritons","authors":"Dou Tian, Amin Kianinejad, Jiafu Wang, Chen Guo, Anxue Zhang","doi":"10.1515/freq-2023-0164","DOIUrl":"https://doi.org/10.1515/freq-2023-0164","url":null,"abstract":"We proposed a high gain high-efficiency compact metallic resonator antenna operating at even-mode meander line spoof surface plasmon polaritons (MLSSPPs). The high radiation efficiency is caused by the bulk of fields crowded in lossless air near the antenna rather than in lossy dielectric as in conventional dielectric resonator antennas (DRAs). The proposed antenna also exhibits compact size because of its high effective refractive index. A reliable equivalent circuit model is proposed for the design of the resonator antenna with basic mode of half wavelength resonant mode. As an example, a meander-line SSPP antenna is designed, fabricated and measured. Both the simulated and measured results show the advantages of high efficiency and compact volume. In addition, the antenna achieves higher gain and wider relative bandwidth per wavelength cube volume compared with its counterparts. This method provides a good alternative for designing DRAs.","PeriodicalId":55143,"journal":{"name":"Frequenz","volume":"44 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139752264","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}
引用次数: 0
A fast convergent solution of wave propagation for multilayer inhomogeneous cylindrical dielectric waveguides using a semianalytical method 利用半解析法快速收敛多层非均质圆柱介质波导的波传播解法
IF 1.1 4区 工程技术
Frequenz Pub Date : 2024-02-12 DOI: 10.1515/freq-2023-0128
Qianru Weng
{"title":"A fast convergent solution of wave propagation for multilayer inhomogeneous cylindrical dielectric waveguides using a semianalytical method","authors":"Qianru Weng","doi":"10.1515/freq-2023-0128","DOIUrl":"https://doi.org/10.1515/freq-2023-0128","url":null,"abstract":"This paper presents an accurate and efficient semianalytical method based on the Galerkin procedure for solving electromagnetic wave propagation problems in multilayer inhomogeneous cylindrical dielectric waveguides. The method represents the field in each inhomogeneous layer by a linear combination of eigenfunctions with unknown coefficients, which are expressed using the inner products of a series of basis functions, following the Galerkin procedure. The continuity of the field and its radial derivative is enforced at the interface between adjacent layers. By applying this procedure to all inhomogeneous layers, the Helmholtz equations are transformed into linear algebraic equations with expanded coefficients in matrix form, allowing the complicated wave propagation problem in a multilayer inhomogeneous waveguide to be solved as a matrix eigenvalue problem. The method is validated by providing detailed propagation characteristics for various multilayer inhomogeneous cylinders with different permittivity profiles. The accuracy and efficiency of the proposed method are demonstrated through comparisons with results obtained using other numerical techniques.","PeriodicalId":55143,"journal":{"name":"Frequenz","volume":"57 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139752263","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}
引用次数: 0
Design of a dual-band wearable flexible MIMO antenna system for ISM band applications 为 ISM 波段应用设计双频可穿戴柔性多输入多输出天线系统
IF 1.1 4区 工程技术
Frequenz Pub Date : 2024-02-12 DOI: 10.1515/freq-2023-0300
Lingsheng Yang, Yuhan Sun, Jiaru Zhang, Yizhuang Xie
{"title":"Design of a dual-band wearable flexible MIMO antenna system for ISM band applications","authors":"Lingsheng Yang, Yuhan Sun, Jiaru Zhang, Yizhuang Xie","doi":"10.1515/freq-2023-0300","DOIUrl":"https://doi.org/10.1515/freq-2023-0300","url":null,"abstract":"This article proposes a dual-band (2.4/5.8 GHz) wearable MIMO antenna system that can be applied to the ISM band. The antenna element uses an improved coplanar waveguide feeding structure. The four-element antenna system achieves high isolation between antenna elements through the self-decoupling structure of the antenna element and the orthogonal placement. The use of a floating ground structure effectively suppresses back radiation. Through the combination of coplanar waveguide feeding and floating ground, the antenna not only has a low profile but also improves the front-to-back ratio of antenna radiation, reducing the SAR value. The antenna also uses felt as a flexible dielectric substrate and conductive cloth as a radiation element, making the antenna flexible.","PeriodicalId":55143,"journal":{"name":"Frequenz","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139752214","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}
引用次数: 0
Gain enhancement of ultra-wideband hexagonal slot antenna using tessellated rhombic loops based reflector 使用基于网格菱形环的反射器增强超宽带六角槽天线的增益
IF 1.1 4区 工程技术
Frequenz Pub Date : 2024-02-10 DOI: 10.1515/freq-2023-0183
Ashish Kumar Verma, Rahul Singhal
{"title":"Gain enhancement of ultra-wideband hexagonal slot antenna using tessellated rhombic loops based reflector","authors":"Ashish Kumar Verma, Rahul Singhal","doi":"10.1515/freq-2023-0183","DOIUrl":"https://doi.org/10.1515/freq-2023-0183","url":null,"abstract":"A simple technique for gain enhancement of irregular hexagonal shaped ultra-wide band (UWB) slot antenna by inclusion of closely packed tessellated rhombic loop (TRL) based FSS is presented in this paper. The slot antenna is designed to cover entire UWB (3.1–10.6 GHz) frequency range with stable bi-directional radiation pattern. Also, it exhibits non-uniform boresight gain in zenith (<jats:italic>θ</jats:italic> = 0°) and nadir (<jats:italic>θ</jats:italic> = 180°) directions. The slot antenna is further loaded with TRL FSS at both slot and feed side separately to study distinct configurations of antenna integrated with FSS and evaluate the impact of the configurations of FSS on antenna performance. Later, an antenna and antenna loaded with TRL FSS prototype are developed for experimental validations. Through measurements it is found that the slot antenna covers entire UWB frequency band and provides a maximum of 4.31 dB gain in zenith direction while 4 dB gain in nadir direction. A gain enhancement of 2.44 dB in zenith and 3.8 dB in nadir directions are achieved when the slot antenna is integrated with TRL FSS along feed side and slot side separately. The measured results confirm the simulated results well.","PeriodicalId":55143,"journal":{"name":"Frequenz","volume":"87 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139752211","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}
引用次数: 0
Design and equivalent circuit modelling of super compact ultrathin metamaterial absorber for microwave frequency Regime 微波频率区超小型超薄超材料吸收器的设计与等效电路建模
IF 1.1 4区 工程技术
Frequenz Pub Date : 2024-02-10 DOI: 10.1515/freq-2023-0352
Vishal Puri, Hari Shankar Singh
{"title":"Design and equivalent circuit modelling of super compact ultrathin metamaterial absorber for microwave frequency Regime","authors":"Vishal Puri, Hari Shankar Singh","doi":"10.1515/freq-2023-0352","DOIUrl":"https://doi.org/10.1515/freq-2023-0352","url":null,"abstract":"This article is an attempt to design and develop a metamaterial-based microwave absorber with a low profile, broad incidence angle and compactness in the microwave frequency range. Further, equivalent circuit model of the proposed structure is discussed based on circuit theory. The unit cell focuses on achieving maximum absorption at C-, X-, and K-band. The dimensions of the proposed design are ultrathin and compact, having an overall size of 8 mm × 8 mm × 0.8 mm. The dimensions are optimized in such a fashion to achieve three different peaks at three various bands (C, X and K), thereby making the triple-band behaviour of the metamaterial absorber possible. The structure provides absorption of 98.26 % absorption at 7.76 GHz (C-band) while absorption of 96.74 % is achieved at 10.26 GHz (X-band) and 99.92 % absorption at 19.32 GHz (K-band) of microwave regime. The experimental verification of design conform that the measured results are found to be in close agreement to simulated ones.","PeriodicalId":55143,"journal":{"name":"Frequenz","volume":"8 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139752400","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}
引用次数: 0
A study into strain sensor of cement-based material using CPW transmission lines 利用 CPW 传输线研究水泥基材料的应变传感器
IF 1.1 4区 工程技术
Frequenz Pub Date : 2024-02-09 DOI: 10.1515/freq-2023-0258
Chunyan Song, Mo Li, Weidong Zhang, Xiaodong Wu, Song Gao
{"title":"A study into strain sensor of cement-based material using CPW transmission lines","authors":"Chunyan Song, Mo Li, Weidong Zhang, Xiaodong Wu, Song Gao","doi":"10.1515/freq-2023-0258","DOIUrl":"https://doi.org/10.1515/freq-2023-0258","url":null,"abstract":"Based on the theory of coplanar waveguide (CPW) transmission line, a novel microwave non-destructive strain monitoring sensor specifically designed for cement-based material structures is presented in this study. The aim is to establish the relationship between the variation of the S11 phase parameter of the CPW strain sensor and the structural strain, utilizing a linear analysis. The feasibility of the strain monitoring by the CPW sensor is validated through simulations and experiments. The obtained results demonstrate a strong linear correlation between the phase change of the S11 parameter and the strain, with a goodness of fit of 0.987. The simulated strain sensor exhibits a sensitivity of 48.83 ppm/με, while the experimental measurement sensor shows a sensitivity of 65.82 ppm/με. These findings highlight the potential significance of the proposed method, offering a new approach that is characterized by high sensitivity, low cost, and simplicity for strain monitoring in concrete structures. Among them, the sensor cement mortar matrix made in this study was mixed with the recycled material made of waste glass steel FRP after a certain treatment process. The development of this method holds promise for the advancement of health monitoring in concrete structures.","PeriodicalId":55143,"journal":{"name":"Frequenz","volume":"1 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139752377","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}
引用次数: 0
Tri-arm MIMO array antenna pair for mobile phone applications 用于移动电话应用的三臂 MIMO 阵列天线对
IF 1.1 4区 工程技术
Frequenz Pub Date : 2024-02-07 DOI: 10.1515/freq-2023-0154
Min Zhang, Lehu Wen, Wenchao Xiao
{"title":"Tri-arm MIMO array antenna pair for mobile phone applications","authors":"Min Zhang, Lehu Wen, Wenchao Xiao","doi":"10.1515/freq-2023-0154","DOIUrl":"https://doi.org/10.1515/freq-2023-0154","url":null,"abstract":"An 8 × 8 tri-arm multiple-input multiple-output (MIMO) array using novel even–odd mode decouplers is presented. To decouple the directly connected driven ports on the tri-arm antenna pair, a T-shaped stub working as an even-mode decoupler and a narrow strip working as an odd-mode decoupler are elaborately introduced. Therefore, the even-mode and odd-mode impedances cross with the antenna input impedance, and a deep coupling zero is achieved at this cross frequency. Finally, the proposed 8 × 8 MIMO array was developed, fabricated, and measured for further performance verification. The measured results show that the proposed array can have a wide isolation bandwidth of 17.2 % with a compact size of 0.44<jats:italic>λ</jats:italic> <jats:sub>0</jats:sub> × 0.08<jats:italic>λ</jats:italic> <jats:sub>0</jats:sub> and zero clearance requirement on the ground plane. The diversity performances are also investigated with the measured worst envelope correlation coefficient less than 0.05.","PeriodicalId":55143,"journal":{"name":"Frequenz","volume":"74 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139752265","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}
引用次数: 0
Terahertz MIMO antenna array for future generation of wireless applications 面向未来新一代无线应用的太赫兹 MIMO 天线阵列
IF 1.1 4区 工程技术
Frequenz Pub Date : 2024-02-07 DOI: 10.1515/freq-2023-0203
Rashmi Pant, Leeladhar Malviya
{"title":"Terahertz MIMO antenna array for future generation of wireless applications","authors":"Rashmi Pant, Leeladhar Malviya","doi":"10.1515/freq-2023-0203","DOIUrl":"https://doi.org/10.1515/freq-2023-0203","url":null,"abstract":"The paper proposes a high gain, low ECC, and high isolation THz MIMO antenna array for future generation wireless applications to accommodate a growing population of mobile users. A THz MIMO antenna array is designed with dimensions of 1200 × 2200 × 191.29 µm<jats:sup>3</jats:sup>. It employs the array of double-slit complementary split-ring resonators (D-CSRRs) on the bottom layer to improve the gain, return loss, and isolation. The gain of the proposed antenna array is 11.3 dBi with 66.45 % radiating efficiency at 0.65 THz. The −10 dB impedance bandwidth lies from 0.62–0.66 THz. The parameters of the MIMO antenna are evaluated such as isolation, envelope correlation coefficient (ECC), diversity gain (DG), and channel capacity loss. The ECC and DG value observed are 2.84 × 10<jats:sup>−6</jats:sup> and 9.98 dB, respectively, at 0.65 THz. The channel capacity loss and isolation of the proposed MIMO antenna array are below 0.4 bps/Hz and (|<jats:italic>S</jats:italic> <jats:sub>21</jats:sub>| &gt; 25 dB), respectively, in the complete operating band. The suggested THz MIMO antenna array can be utilised for THz high-speed wireless communication, video-rate imaging systems, sensing, the medical field for cancer imaging, security scanning, and the detection of illicit goods.","PeriodicalId":55143,"journal":{"name":"Frequenz","volume":"6 1","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139752266","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}
引用次数: 0
A novel broadband and high-gain compact annular ring microstrip antenna for satellite applications 用于卫星应用的新型宽带高增益紧凑型环形微带天线
IF 1.1 4区 工程技术
Frequenz Pub Date : 2024-01-15 DOI: 10.1515/freq-2023-0102
Vivek Arya, Tanuj K. Garg
{"title":"A novel broadband and high-gain compact annular ring microstrip antenna for satellite applications","authors":"Vivek Arya, Tanuj K. Garg","doi":"10.1515/freq-2023-0102","DOIUrl":"https://doi.org/10.1515/freq-2023-0102","url":null,"abstract":"Abstract This article presents a novel compact design of an annular ring microstrip antenna (ARMSA), which has two stacked annular rings and is fabricated on a FR4 substrate for radar and satellite applications. The presence of different kinds of slots made the design of the recommended antenna very unique for Ku band applications. This novel compact structure of the antenna provided enhanced bandwidth and high gain. The suggested antenna works in Ku band and has 2.70 GHz bandwidth and 8.42 dB gain, which makes it suitable for satellite applications. The quality parameters of the proposed annular ring microstrip antenna have been compared with other existing annular ring microstrip antennas, which shows its efficient performance.","PeriodicalId":55143,"journal":{"name":"Frequenz","volume":"50 2","pages":""},"PeriodicalIF":1.1,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139437383","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}
引用次数: 0
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