Pub Date : 2023-10-30DOI: 10.1080/09205071.2023.2272612
Shreen El-Sapa, Alaa A. El-Bary, Wedad Albalawi, H. M. Atef
{"title":"Modelling Pennes’, bioheat transfer equation in thermoelasticity with one relaxation time","authors":"Shreen El-Sapa, Alaa A. El-Bary, Wedad Albalawi, H. M. Atef","doi":"10.1080/09205071.2023.2272612","DOIUrl":"https://doi.org/10.1080/09205071.2023.2272612","url":null,"abstract":"","PeriodicalId":15650,"journal":{"name":"Journal of Electromagnetic Waves and Applications","volume":"10 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136103125","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}
Pub Date : 2023-10-23DOI: 10.1080/09205071.2023.2270603
Cemile Tangel, Nigar Berna Teşneli
AbstractThis paper presents a wideband, thin-profile and enhanced-gain microstrip patch antenna improved by using a novel mushroom-like Electromagnetic Band Gap (EBG) structure and forming periodic Defected Ground Structures (DGS) on the ground plane. The proposed antenna operates between 9.56 and 14 GHz and has 4.44 GHz–10 dB impedance bandwidth. With A4, the gain of the reference antenna is increased by 64.4%, while a 38% bandwidth is also achieved. The parametric analyses carried out on the metallic part area of the novel EBG patch indicated that when the area of the used EBG patches are approximately three quarters or less of the conventional ones, greater gain values for the designed antenna are obtained. This relation between the EBG patches and the antenna gain can be pointed out as the novelty of the study. The results were analysed by the simulations carried out with CST Microwave Studio and were verified by measurements from manufactured prototypes.KEYWORDS: Widebandthin-profilegain enhancementmicrostrip antennaEBGDGS Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationNotes on contributorsCemile TangelCemile Tangel received BSc degree from Gazi University, Dept. of Electrical and Electronics Eng. in 1991, and MSc degree from Kocaeli University Dept. of Electronics and Comimunication Eng. in 2009. She has currently been pursuing PhD degree in Electrical and Electronics Engineering, Graduate Education Institute, Sakarya University of Applied Sciences, Sakarya, Turkey. Her research areas include electromagnetic theory, antenna designs, microstrip antennas and EBG structures.Nigar Berna TeşneliNigar Berna Teşneli received the B.S., M.S., and Ph.D. degrees in Physics Engineering from the Faculty of Engineering, University of Hacettepe, Ankara, Turkey, in 1998, 2000, and 2005, respectively. She worked at the Department of Physics Engineering, University of Hacettepe, Ankara, Turkey and with the Department of Electrical and Electronics Engineering, University of Sakarya, Sakarya, Turkey. She has been with the Nanomaterial Engineering Group, University of Sheffield, Sheffield, U.K., as visiting researcher in 2003. Since 2018, she has been working as an Assistant Professor with the Department of Engineering Fundamental Sciences, Sakarya University of Applied Sciences, Sakarya, Turkey. Her research interests include electromagnetic field theory, antenna design, metamaterials, electromagnetic bandgap structures, frequency selective surfaces, electromagnetic measurements and electromagnetic compatibility.
{"title":"A wideband, thin profile and enhanced gain microstrip patch antenna modified by novel mushroom-like EBG and periodic defected ground structures","authors":"Cemile Tangel, Nigar Berna Teşneli","doi":"10.1080/09205071.2023.2270603","DOIUrl":"https://doi.org/10.1080/09205071.2023.2270603","url":null,"abstract":"AbstractThis paper presents a wideband, thin-profile and enhanced-gain microstrip patch antenna improved by using a novel mushroom-like Electromagnetic Band Gap (EBG) structure and forming periodic Defected Ground Structures (DGS) on the ground plane. The proposed antenna operates between 9.56 and 14 GHz and has 4.44 GHz–10 dB impedance bandwidth. With A4, the gain of the reference antenna is increased by 64.4%, while a 38% bandwidth is also achieved. The parametric analyses carried out on the metallic part area of the novel EBG patch indicated that when the area of the used EBG patches are approximately three quarters or less of the conventional ones, greater gain values for the designed antenna are obtained. This relation between the EBG patches and the antenna gain can be pointed out as the novelty of the study. The results were analysed by the simulations carried out with CST Microwave Studio and were verified by measurements from manufactured prototypes.KEYWORDS: Widebandthin-profilegain enhancementmicrostrip antennaEBGDGS Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationNotes on contributorsCemile TangelCemile Tangel received BSc degree from Gazi University, Dept. of Electrical and Electronics Eng. in 1991, and MSc degree from Kocaeli University Dept. of Electronics and Comimunication Eng. in 2009. She has currently been pursuing PhD degree in Electrical and Electronics Engineering, Graduate Education Institute, Sakarya University of Applied Sciences, Sakarya, Turkey. Her research areas include electromagnetic theory, antenna designs, microstrip antennas and EBG structures.Nigar Berna TeşneliNigar Berna Teşneli received the B.S., M.S., and Ph.D. degrees in Physics Engineering from the Faculty of Engineering, University of Hacettepe, Ankara, Turkey, in 1998, 2000, and 2005, respectively. She worked at the Department of Physics Engineering, University of Hacettepe, Ankara, Turkey and with the Department of Electrical and Electronics Engineering, University of Sakarya, Sakarya, Turkey. She has been with the Nanomaterial Engineering Group, University of Sheffield, Sheffield, U.K., as visiting researcher in 2003. Since 2018, she has been working as an Assistant Professor with the Department of Engineering Fundamental Sciences, Sakarya University of Applied Sciences, Sakarya, Turkey. Her research interests include electromagnetic field theory, antenna design, metamaterials, electromagnetic bandgap structures, frequency selective surfaces, electromagnetic measurements and electromagnetic compatibility.","PeriodicalId":15650,"journal":{"name":"Journal of Electromagnetic Waves and Applications","volume":"17 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135366816","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}
ABSTRACTThis paper introduces a method to reduce mutual coupling in a two-element multiple-input multiple-output (MIMO) antenna, which is a significant challenge due to the need for high isolation over a wide frequency range with close element spacing. Previous works typically achieved high isolation within a narrow bandwidth. The paper presents a novel defected ground structure (DGS) with a modified I-shaped slot, which effectively minimizes mutual coupling in a dual-sense MIMO circularly polarized (CP) antenna over a broader bandwidth than the previous approaches. The fabricated 2-element prototype with an overall size of 0.98λ × 0.71λ × 0.05λ and an edge-to-edge spacing of 0.08λ at the center operating frequency has a measured bandwidth of 2.5% (5.2–5.33 GHz). Across this band, the isolation is always better than 35 dB and the gain is higher than 4.8 dBi. The MIMO parameters are also investigated, which proves the good diversity performance of the proposed design.KEYWORDS: MIMOcircularly polarizedhigh isolationmicrostrip patchdefected ground structure Disclosure statementNo potential conflict of interest was reported by the authors.
{"title":"A novel defected ground structure for high-isolation circularly polarized MIMO patch antenna","authors":"Duc-Nguyen Tran Viet, Hung Tran-Huy, Dinh Nguyen Quoc, Hyun Chang Park","doi":"10.1080/09205071.2023.2270524","DOIUrl":"https://doi.org/10.1080/09205071.2023.2270524","url":null,"abstract":"ABSTRACTThis paper introduces a method to reduce mutual coupling in a two-element multiple-input multiple-output (MIMO) antenna, which is a significant challenge due to the need for high isolation over a wide frequency range with close element spacing. Previous works typically achieved high isolation within a narrow bandwidth. The paper presents a novel defected ground structure (DGS) with a modified I-shaped slot, which effectively minimizes mutual coupling in a dual-sense MIMO circularly polarized (CP) antenna over a broader bandwidth than the previous approaches. The fabricated 2-element prototype with an overall size of 0.98λ × 0.71λ × 0.05λ and an edge-to-edge spacing of 0.08λ at the center operating frequency has a measured bandwidth of 2.5% (5.2–5.33 GHz). Across this band, the isolation is always better than 35 dB and the gain is higher than 4.8 dBi. The MIMO parameters are also investigated, which proves the good diversity performance of the proposed design.KEYWORDS: MIMOcircularly polarizedhigh isolationmicrostrip patchdefected ground structure Disclosure statementNo potential conflict of interest was reported by the authors.","PeriodicalId":15650,"journal":{"name":"Journal of Electromagnetic Waves and Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135511188","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}
Pub Date : 2023-10-21DOI: 10.1080/09205071.2023.2270477
Ahmet Aydoğan
ABSTRACTThis paper proposes a new, fast, and efficient method for determining the electromagnetic field distribution in two-port E-plane dielectric-loaded uniform rectangular waveguides. The analysis region is divided into individual blocks in the absence and presence of dielectric obstacles. The non-zero electric and magnetic field components are constructed throughout the system via the proposed method by utilizing the generalized scattering matrix method between blocks for unimodal or multimodal excitation. The resulting field distributions are compared to those obtained from commercial software, with very close agreement achieved, but with a significantly reduced computational time for the proposed method. The method is applicable in a straightforward manner and has been tested on both a filter device with relatively complex geometry and a disjoint system with a modal coupling challenge between its elements. The field components' accuracy is also tested by calculating the Poynting vector along the system. Additionally, this approach provides the global scattering parameters at the physical ports as a co-product. The proposed method has the potential to be applied to various two-port networks by using the proposed method according to the considered problem.KEYWORDS: Cascaded systemsfield distributiongeneralized scattering matrixmicrowave devicesrectangular waveguide Disclosure statementNo potential conflict of interest was reported by the author(s).
{"title":"An efficient determination of field distributions in E-plane dielectric loaded waveguides","authors":"Ahmet Aydoğan","doi":"10.1080/09205071.2023.2270477","DOIUrl":"https://doi.org/10.1080/09205071.2023.2270477","url":null,"abstract":"ABSTRACTThis paper proposes a new, fast, and efficient method for determining the electromagnetic field distribution in two-port E-plane dielectric-loaded uniform rectangular waveguides. The analysis region is divided into individual blocks in the absence and presence of dielectric obstacles. The non-zero electric and magnetic field components are constructed throughout the system via the proposed method by utilizing the generalized scattering matrix method between blocks for unimodal or multimodal excitation. The resulting field distributions are compared to those obtained from commercial software, with very close agreement achieved, but with a significantly reduced computational time for the proposed method. The method is applicable in a straightforward manner and has been tested on both a filter device with relatively complex geometry and a disjoint system with a modal coupling challenge between its elements. The field components' accuracy is also tested by calculating the Poynting vector along the system. Additionally, this approach provides the global scattering parameters at the physical ports as a co-product. The proposed method has the potential to be applied to various two-port networks by using the proposed method according to the considered problem.KEYWORDS: Cascaded systemsfield distributiongeneralized scattering matrixmicrowave devicesrectangular waveguide Disclosure statementNo potential conflict of interest was reported by the author(s).","PeriodicalId":15650,"journal":{"name":"Journal of Electromagnetic Waves and Applications","volume":"23 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135510731","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}
AbstractTime-modulated arrays (TMAs) have a high design degrees of freedom (DoFs) to improve radiation performance, while they are prone to failure due to their hardware characteristics. In this article, we propose a novel technique to diagnose impaired TMAs based on compressed sensing (CS). The TMA diagnosis problem is reformulated as a sparse signal recovery problem at the center frequency and sidebands. Then, a method based on the difference of convex sets theory and sequential convex programming (DCS-SCP) is developed to implement diagnosis for impaired TMAs. Using a small number of far-field measurements at the same position but different frequencies, the joint recovery of the equivalent excitations at the center frequency and sidebands is realized by a mixed l0/l2-norm minimization method. The numerical simulation and the successful comparison with the state-of-the-art algorithms demonstrate the superiority of the proposed methods in terms of noise robustness and diagnosis accuracy.Keywords: Array failurecompressed sensingconvex programmingtime-modulated arrays Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationNotes on contributorsGuo BaiGuo Bai received the B.E. degree in electronic information science and technology from the Chengdu University of Information and Technology, China, in 2019. He is currently pursuing the Ph.D. degree in philosophy with the School of Physical Science and Technology, Southwest Jiaotong University, China., His research interests include antenna array diagnosis algorithms, array synthesis algorithms, computational electromagnetic and electromagnetic optimization algorithms.Cheng LiaoCheng Liao received the Ph.D. degree in electromagnetic fields and microwave techniques from the University of Electronic Science and Technology of China (UESTC), Chengdu, China, in 1995. From 1997 to 1998, he was a Visiting Scholar at the City University of Hong Kong, Kowloon Tong, Hong Kong. He became a Professor with Southwest Jiaotong University, Chengdu, China, in 1998. His research interests include high-power microwave technology, computational electromagnetic, and antenna.You-Feng ChengYou-Feng Cheng received the Ph.D. degree in radio physics from the University of Electronic Science and Technology of China, Chengdu, China, in 2018. In 2017, he joined the Mechanical Engineering Department, University of Houston, Houston, TX, USA, as a Visiting Scholar. In 2018, he joined Southwest Jiaotong University (SWJTU), Chengdu, China. He is currently an Associate Professor with the Institute of Electromagnetics, SWJTU. He has authored or coauthored more than 40 peer reviewed papers. His research interests include phased arrays, reconfigurable antennas, low-RCS antennas, array analysis and synthesis, and evolutionary algorithms.Yuanzhi LiuYuanzhi Liu (Student Member, IEEE) received the B.Eng. degree in electronics from the Chengdu University of Information Technology, Chengdu, Chin
{"title":"Failure diagnosis for time-modulated arrays based on compressed sensing","authors":"Guo Bai, Cheng Liao, You-Feng Cheng, Yuanzhi Liu, Ju Feng, Xuanming Zhong","doi":"10.1080/09205071.2023.2270517","DOIUrl":"https://doi.org/10.1080/09205071.2023.2270517","url":null,"abstract":"AbstractTime-modulated arrays (TMAs) have a high design degrees of freedom (DoFs) to improve radiation performance, while they are prone to failure due to their hardware characteristics. In this article, we propose a novel technique to diagnose impaired TMAs based on compressed sensing (CS). The TMA diagnosis problem is reformulated as a sparse signal recovery problem at the center frequency and sidebands. Then, a method based on the difference of convex sets theory and sequential convex programming (DCS-SCP) is developed to implement diagnosis for impaired TMAs. Using a small number of far-field measurements at the same position but different frequencies, the joint recovery of the equivalent excitations at the center frequency and sidebands is realized by a mixed l0/l2-norm minimization method. The numerical simulation and the successful comparison with the state-of-the-art algorithms demonstrate the superiority of the proposed methods in terms of noise robustness and diagnosis accuracy.Keywords: Array failurecompressed sensingconvex programmingtime-modulated arrays Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationNotes on contributorsGuo BaiGuo Bai received the B.E. degree in electronic information science and technology from the Chengdu University of Information and Technology, China, in 2019. He is currently pursuing the Ph.D. degree in philosophy with the School of Physical Science and Technology, Southwest Jiaotong University, China., His research interests include antenna array diagnosis algorithms, array synthesis algorithms, computational electromagnetic and electromagnetic optimization algorithms.Cheng LiaoCheng Liao received the Ph.D. degree in electromagnetic fields and microwave techniques from the University of Electronic Science and Technology of China (UESTC), Chengdu, China, in 1995. From 1997 to 1998, he was a Visiting Scholar at the City University of Hong Kong, Kowloon Tong, Hong Kong. He became a Professor with Southwest Jiaotong University, Chengdu, China, in 1998. His research interests include high-power microwave technology, computational electromagnetic, and antenna.You-Feng ChengYou-Feng Cheng received the Ph.D. degree in radio physics from the University of Electronic Science and Technology of China, Chengdu, China, in 2018. In 2017, he joined the Mechanical Engineering Department, University of Houston, Houston, TX, USA, as a Visiting Scholar. In 2018, he joined Southwest Jiaotong University (SWJTU), Chengdu, China. He is currently an Associate Professor with the Institute of Electromagnetics, SWJTU. He has authored or coauthored more than 40 peer reviewed papers. His research interests include phased arrays, reconfigurable antennas, low-RCS antennas, array analysis and synthesis, and evolutionary algorithms.Yuanzhi LiuYuanzhi Liu (Student Member, IEEE) received the B.Eng. degree in electronics from the Chengdu University of Information Technology, Chengdu, Chin","PeriodicalId":15650,"journal":{"name":"Journal of Electromagnetic Waves and Applications","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135888748","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}
Pub Date : 2023-10-11DOI: 10.1080/09205071.2023.2260381
R. Viger, S. Ramsey, T. Mayo, S. G. Lambrakos
AbstractThis study describes the estimation of dielectric response functions for NIR-SWIR absorbing dyes by inverse analysis of diffuse reflectance. The inverse analysis procedure is based on the Kramers–Kronig relations, the Kubelka–Munk model of diffuse reflectance, and the background subtraction of substrate spectra. The calculated response functions provide estimates of the dielectric response characteristics for NIR-SWIR absorbing dyes, as well as their sensitivity to material-background environments. This study demonstrates that Kramers–Kronig analysis can be adopted for calculating estimates of dielectric functions, given any reasonable estimate of absorbance. Specifically, that Kramers–Kronig analysis provides filtering of dielectric response structure with respect to spectrum artifacts due to inverse-analysis and spectroscopic-measurement procedures. This can significantly reduce the experimentation necessary to achieve desired dielectric response characteristics for NIR-SWIR dye and substrate combinations. Furthermore, these calculated response functions can support the construction of approximate effective medium models capable of estimating reflectance features for dyed fabrics.KEYWORDS: Diffuse reflectanceparametric modelingdyed fabricsabsorption spectra Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis project was supported by US DoD programs.
{"title":"Estimation of dielectric response functions for NIR-SWIR absorbing dyes by inverse analysis of diffuse reflectance","authors":"R. Viger, S. Ramsey, T. Mayo, S. G. Lambrakos","doi":"10.1080/09205071.2023.2260381","DOIUrl":"https://doi.org/10.1080/09205071.2023.2260381","url":null,"abstract":"AbstractThis study describes the estimation of dielectric response functions for NIR-SWIR absorbing dyes by inverse analysis of diffuse reflectance. The inverse analysis procedure is based on the Kramers–Kronig relations, the Kubelka–Munk model of diffuse reflectance, and the background subtraction of substrate spectra. The calculated response functions provide estimates of the dielectric response characteristics for NIR-SWIR absorbing dyes, as well as their sensitivity to material-background environments. This study demonstrates that Kramers–Kronig analysis can be adopted for calculating estimates of dielectric functions, given any reasonable estimate of absorbance. Specifically, that Kramers–Kronig analysis provides filtering of dielectric response structure with respect to spectrum artifacts due to inverse-analysis and spectroscopic-measurement procedures. This can significantly reduce the experimentation necessary to achieve desired dielectric response characteristics for NIR-SWIR dye and substrate combinations. Furthermore, these calculated response functions can support the construction of approximate effective medium models capable of estimating reflectance features for dyed fabrics.KEYWORDS: Diffuse reflectanceparametric modelingdyed fabricsabsorption spectra Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis project was supported by US DoD programs.","PeriodicalId":15650,"journal":{"name":"Journal of Electromagnetic Waves and Applications","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136210428","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}
Pub Date : 2023-09-29DOI: 10.1080/09205071.2023.2259052
Yinuo Li, Juan Chen, Jianxing Li
AbstractThis paper presents a microstrip planar antenna array designed for near-field focusing operating at 10 GHz. It is a challenge to reach the phase and amplitude distribution of near-field-focused antenna arrays with small focal spots. The antenna elements of this array are arranged radially on the aperture of only 5.6λ0 × 5.6λ0, which reduces the focal spot diameter. We designed an unequal-amplitude unequal-phase power divider to reach phase distribution and binomial taper distribution. The proposed array suppresses the sidelobes on the focal plane. It increases the electric field intensity by 11.46 dB compared with the horn with the same aperture size and increases 9.42 dB compared with the equal-phase array. The focus spot diameter is only 0.33λ0. The simulated and measured results are in good agreement, which verifies the high performance of the array. This miniaturized high-focus array has a good prospect in near-field applications like wireless energy transmission and industrial detection.KEYWORDS: Microstrip arrayplanar arraynear-field-focusedminiaturization Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by the National Natural Science Foundations of China [grant numbers 61971340 and 62122061]; the National Key Research and Development Program of China [grant number 2020YFA0709800]; and the Technology Program of Shenzhen [grant number JCYJ20180508152233431].
{"title":"Miniaturized near-field-focused antenna array","authors":"Yinuo Li, Juan Chen, Jianxing Li","doi":"10.1080/09205071.2023.2259052","DOIUrl":"https://doi.org/10.1080/09205071.2023.2259052","url":null,"abstract":"AbstractThis paper presents a microstrip planar antenna array designed for near-field focusing operating at 10 GHz. It is a challenge to reach the phase and amplitude distribution of near-field-focused antenna arrays with small focal spots. The antenna elements of this array are arranged radially on the aperture of only 5.6λ0 × 5.6λ0, which reduces the focal spot diameter. We designed an unequal-amplitude unequal-phase power divider to reach phase distribution and binomial taper distribution. The proposed array suppresses the sidelobes on the focal plane. It increases the electric field intensity by 11.46 dB compared with the horn with the same aperture size and increases 9.42 dB compared with the equal-phase array. The focus spot diameter is only 0.33λ0. The simulated and measured results are in good agreement, which verifies the high performance of the array. This miniaturized high-focus array has a good prospect in near-field applications like wireless energy transmission and industrial detection.KEYWORDS: Microstrip arrayplanar arraynear-field-focusedminiaturization Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by the National Natural Science Foundations of China [grant numbers 61971340 and 62122061]; the National Key Research and Development Program of China [grant number 2020YFA0709800]; and the Technology Program of Shenzhen [grant number JCYJ20180508152233431].","PeriodicalId":15650,"journal":{"name":"Journal of Electromagnetic Waves and Applications","volume":"100 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135193882","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}
Pub Date : 2023-09-28DOI: 10.1080/09205071.2023.2262984
Hishem Hyani, Bruno Sauviac, Gérard Granet, Bernard Bayard, Stéphane Robert, Kofi Edee
Previous works have demonstrated that a parallel plate waveguide, equipped at the end with a tip, can be used to initiate an “electromagnetic jet (Ej)” (this name generalizes the photonic jet (Pj) phenomenon regardless of the wavelength). In addition to being easy to manufacture, a rectangular shape improves energy concentration, however concurrently the full-width at half maximum (FWHM) is slightly degraded. This article aims to introduce tips with multi-rectangular sections reducing the drawbacks previously mentioned. This article proposes the use of Aperiodic Polynomial Modal Method (A-PMM) as an efficient yet robust method to model and optimize an outgoing Ej, equipped with this kind of dielectric tips. Thus, a three rectangular sections tip can improve energy concentration and can reduce the FWHM beyond the diffraction limit compared to a single section tip.
{"title":"Electromagnetic jet produced with loaded waveguide ended by an optimized multi-rectangular sections tip","authors":"Hishem Hyani, Bruno Sauviac, Gérard Granet, Bernard Bayard, Stéphane Robert, Kofi Edee","doi":"10.1080/09205071.2023.2262984","DOIUrl":"https://doi.org/10.1080/09205071.2023.2262984","url":null,"abstract":"Previous works have demonstrated that a parallel plate waveguide, equipped at the end with a tip, can be used to initiate an “electromagnetic jet (Ej)” (this name generalizes the photonic jet (Pj) phenomenon regardless of the wavelength). In addition to being easy to manufacture, a rectangular shape improves energy concentration, however concurrently the full-width at half maximum (FWHM) is slightly degraded. This article aims to introduce tips with multi-rectangular sections reducing the drawbacks previously mentioned. This article proposes the use of Aperiodic Polynomial Modal Method (A-PMM) as an efficient yet robust method to model and optimize an outgoing Ej, equipped with this kind of dielectric tips. Thus, a three rectangular sections tip can improve energy concentration and can reduce the FWHM beyond the diffraction limit compared to a single section tip.","PeriodicalId":15650,"journal":{"name":"Journal of Electromagnetic Waves and Applications","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135425007","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}
Pub Date : 2023-09-27DOI: 10.1080/09205071.2023.2262985
Muhammed Fatih Corapsiz
AbstractIn this study, a metasurface-based linear and circular polarization converter operating on the reflection mode is proposed for X- and Ku-band microwave applications. The proposed converter offers an optimum performance with a polarization conversion ratio (PCR) and polarization matching ratio (PMR) greater than 93% in the 8.32--17.55GHz bandwidth for a linearly polarized in the y-direction and right-handed circular polarized (RHCP) incident waves. Besides, the design performs over 80% PCR performance up to 45∘ under oblique incidence. Moreover, the proposed converter is capable of left-handed circular polarization conversion between 7.42 and 7.68 GHz for a y-polarized incident wave. The design offers a relative bandwidth (RBW) of 71.36%. The converter design is constructed with metal termination, an easily accessible FR-4 substrate and a simple design metasurface. Surface currents of the polarization converter at resonance frequencies of 8.77, 12.88 and 16.7GHz were examined to understand its working mechanism. In addition, when the proposed design is rearranged with the appropriate geometry, the monostatic RCS reduction value in the 8.0–17.7GHz range is observed to be higher than 10 dB. CST program (a commercial 3D electromagnetic simulator) was used in simulations. The simulated device was fabricated with a traditional board fabrication technique. Simulation results were verified with free space measurements calibrated by the thru-reflect-line calibration procedure. The performance and efficiency of the proposed polarization converter were compared with other converters in the literature.Keywords: Metasurfacepolarization conversionlinear polarizationcircular polarizationX-band and Ku-bandRCS reduction Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationNotes on contributorsMuhammed Fatih CorapsizMuhammed Fatih Corapsiz received the B.S. degree from Firat University, Elazig, Turkey, in 2003, and the M.S. and Ph.D. degrees from Ataturk University, Erzurum, Turkey, in 2009 and 2014, respectively, all in electrical and electronics engineering. Since 2016, he has been an Assistant Professor with the Department of Electrical and Electronics Engineering, His research interests include mechatronic and robotic systems, solar energy, dc-dc converters and metasurface-based linear and circular polarization converters.
摘要:本研究提出了一种基于反射模式的超表面线性和圆偏振变换器，用于X波段和ku波段微波。在8.32 ~ 17.55GHz带宽范围内，对于y向线极化和右手圆极化入射波，该变换器的极化转化率(PCR)和极化匹配率(PMR)均大于93%，具有最佳性能。此外，该设计在45°斜入射下的PCR性能超过80%。此外，对于y偏振入射波，该变换器能够在7.42 ~ 7.68 GHz范围内实现左旋圆偏振转换。该设计的相对带宽(RBW)为71.36%。转换器设计采用金属端接、易于访问的FR-4基板和简单的设计超表面。对极化变换器在8.77、12.88和16.7GHz谐振频率下的表面电流进行了测试，以了解其工作机理。此外，当采用适当的几何形状重新排列所提出的设计时，观察到在8.0-17.7GHz范围内的单稳态RCS降低值高于10 dB。采用CST软件(商用三维电磁模拟器)进行仿真。采用传统的制板工艺制作模拟器件。仿真结果与自由空间测量通过反射线校准程序进行了验证。将所提出的极化变换器的性能和效率与文献中其他变换器进行了比较。关键词:超表面偏振转换线性偏振圆偏振x波段和ku波段rcs降低披露声明作者未报告潜在利益冲突。muhammad Fatih Corapsiz于2003年在土耳其埃拉齐格的Firat大学获得学士学位，并于2009年和2014年分别在土耳其埃尔祖鲁姆的Ataturk大学获得电气和电子工程硕士和博士学位。自2016年起，他一直担任电气与电子工程系的助理教授，他的研究兴趣包括机电和机器人系统，太阳能，dc-dc转换器和基于超表面的线性和圆极化转换器。
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