2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)最新文献

{"title":"Design and Numerical Characterization of a Realistic Plasma Dipole","authors":"P. de Carlo, Giulia Mansutti, M. Magarotto, A. Capobianco, D. Pavarin, A. Tuozzi, C. Facchinetti","doi":"10.1109/ICEAA.2019.8879237","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879237","url":null,"abstract":"This work presents the numerical results for a plasma dipole antenna that exploits plasma technology to generate and receive electromagnetic fields. Two models have been considered, namely an ideal plasma dipole, and a realistic plasma dipole. The latter comprises part of the plasma generation equipment (e.g. metal terminations, inductors). The realistic plasma dipole was realized in practice and tested for the plasma density. Moreover, a preliminary test by means of a vector network analyzer with the plasma turned off was undertaken to verify the accuracy of the simulation models. Both the models can achieve good antenna performances. However, a downshift in the operational frequency can be observed when a more realistic design is considered. All the simulated results have been obtained through full-wave numerical simulations in CST Microwave Studio.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122074675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical and Experimental Evaluation of Short Folded Recieve-Only Dipoles for 9.4T Human Head Arrays","authors":"G. Solomakha, S. Glybovski, I. Melchakova, A. Hennig, K. Schefler, N. Avdievich","doi":"10.1109/ICEAA.2019.8879340","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879340","url":null,"abstract":"Improvement of signal-to-noise ratio (SNR) is a critical step in designing any MRI radio frequency (RF) coil. Increasing the number of surface loops in a human head receive (Rx) array improves the peripheral SNR, while the central SNR doesnt substantially change. Recent studies demonstrated that an optimal central SNR at UHF frequencies (298 MHz and higher) requires contribution of two current patterns associated with loops and dipoles. To incorporate multiple dipoles into a human head loop Rx-array, the dipole length has to be substantially reduced, which compromises its performance. Another issue of using short Rx-dipoles is a sensitivity of their resonance frequency to loading due to a large electrical field near the dipole. To reduce the sensitivity, we propose to fold dipoles towards the RF-shield. A novel array consisting of 8 transceiver surface loops and 8 folded Rx-dipoles was developed and tested. Addition of Rx-dipoles doesnt substantially change the $B_{1}^{+}$ field and the maximum local SAR of the array. At the same time, the new design improves both the central and peripheral SNR as compared 16-element array with Rx-only vertical loops and 8-element transceiver surface loop array.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124495791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High Frequency Asymptotic Evaluation of PO Integral for EM Scattering from PEC Circular Cylinder","authors":"Ta Quang Ngoc, H. Shirai","doi":"10.1109/ICEAA.2019.8879334","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879334","url":null,"abstract":"In this paper, the scattering field from a circular conducting cylinder has been estimated by the high frequency asymptotic evaluation of physical optics (PO) integral for the case of transverse magnetic (TM) polarization. The steepest descent path (SDP) method has been used to estimate the scattering radiation integral. An approximation has also been proposed to estimate the scattering far field at the vicinity of the forward direction. The asymptotic results are compared with those by numerical integration method and the exact eigenfunction expansion solution.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129460472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Antenna Design and Optimisation of the Radio Experiment for the Analysis of Cosmic Hydrogen","authors":"B. Klopper, D. D. De Villiers, E. de Lera Acedo","doi":"10.1109/ICEAA.2019.8879323","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879323","url":null,"abstract":"The Radio Experiment for the Analysis of Cosmic Hydrogen (REACH) is a new project to perform radiometric measurements in the 50–200 MHz frequency range, with the purpose of realising a confident detection of the red-shifted 21 cm line signature pertaining to the Epoch of Reionisation (EoR) and Cosmic Dawn (CD). The brightness temperature of this signal is several orders of magnitude lower than those of the galactic and extra-galactic foregrounds, necessitating a radiometer design that is capable of extracting the 21 cm signal with minimal distortion due to systematic effects in the receiver instrumentation. The REACH project is an international collaboration between numerous research institutions, with prototype deployment for late 2019 planned in the Karoo region of South Africa.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129787017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An investigation into the use of CALNN capped gold nanoparticles for improving microwave heating","authors":"J. Bonello, Francesco Rossi, N. Thanh, I. Farhat, L. Farrugia, C. Sammut","doi":"10.1109/ICEAA.2019.8878917","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8878917","url":null,"abstract":"The use of microwaves for both therapeutic and diagnostic applications has become an accepted alternative in the clinics. For diagnostics, gold (Au) nanoparticles have been used for imaging tumour vasculature and also served as potential diagnostic markers for cancer. [1] In high-frequency therapeutic applications, two different treatments exist; hyperthermia and ablation. [2] In hyperthermia, the tumour tissue is heated to supra-physiological temperatures, making it more susceptible to traditional treatment methods such as chemotherapy and radiotherapy. This type of treatment could be administered externally. However, there still remains a challenge to focus the heating to particular areas which need to be treated, while avoiding unwanted hotspots. To date, numerous methods have been used to focus the heat from different antennas. A novel technique which is being investigated is the use of nanoparticles to improve focusing and thus achieve better localised heating effect. A previous study by Cardinal et al. [3] showed that at RF-frequencies, remarkable improvements resulted from using Au nanoparticles. In this work, the use of CALNN peptide capped Au nanoparticles for the focusing of microwaves at 2.45 GHz is investigated. The CALNN capped Au nanoparticles were prepared as described elsewhere. [4] Au nanoparticles were added to tissue mimicking solutions (such as muscle, liver or fat) to compare their dielectric properties with the those of the control (without Au nanoparticles). The frequency range investigated was from 400 MHz to 20 GHz. During this study, various concentrations, particle sizes and shapes of Au nanoparticles were considered. The study also investigated the heating rates of the pseudo-biological tissue samples and how these varied with the addition of the nanoparticles. The outcome of this study will determine the viability of using CALNN capped Au nanoparticles to assist in the focusing of microwave radiation during microwave hyperthermia.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128650792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Path loss compensated co-polarized stacked antennas with progressive offset ZIM for mmWave 5G base stations","authors":"G. Karthikeya, M. Abegaonkar, S. Koul","doi":"10.1109/ICEAA.2019.8879121","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879121","url":null,"abstract":"In order to achieve uniform illumination on the ground in the context of an indoor base station, path loss compensation of the base station antennas is necessary. Hence, a co-polarized pattern diversity topology is proposed to realize the same. The module has three elements wherein the central element is a tapered slot antenna operating at 28 GHz and a gain of 5.5 dBi. 3 dB additional gain is required for beams being illuminated at 45°. A progressive offset zero index metamaterial ensemble is integrated onto the aperture of the tapered slot antenna. A compact stacked co-polarized architecture is presented for an angular coverage of 130°.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"159 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127549884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fundamental analysis of electromagnetic wave scattering from multi-layered window glass in multi-frequency band","authors":"R. Sato, H. Shirai","doi":"10.1109/ICEAA.2019.8879383","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879383","url":null,"abstract":"In this paper, we examine electromagnetic wave scattering from a window glass in multi-frequency band. Here we focus on scattering from three-layered window glass, which is made of sandwich dielectric structure (dielectric-air-dielectric structure). The scattering features from the layered glass for the wide bands are in detail examined by using ‘collective ray solutions’, which are high frequency asymptotic approximate solutions and can bundle the the multiple reflected rays in each layer into the primary scattered fields. Here we discuss on the resonance-like phenomena as low reflection return occurs, by comparing with the results of primary scattered model and single layer slab model.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127338342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Surface and volume plasmons of spheroidal metal nanoparticles","authors":"I. Pavlichenko","doi":"10.1109/ICEAA.2019.8879012","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879012","url":null,"abstract":"Based on the hydrodynamic approach, the spectra of the linear polarization response of a small spheroidal metal nanoparticle interacting with an external optical field is calculated taking into account the thermal motion of valence electrons and excitation of both surface and volume plasmons. Provided calculations show that the particle elongation in the field direction reduces the broadening of the surface plasmon resonant peak and that the resonances at frequencies of volume plasmons can be accompanied by strong field enhancement in the central region of the nanoparticle.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128921892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Time-Domain Analysis of Stochastic Electromagnetic Fields based on Jefimenko's Equation","authors":"J. Russer, M. Haider, A. Baev, Y. Kuznetsov, P. Russer","doi":"10.1109/ICEAA.2019.8879022","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879022","url":null,"abstract":"A method for time-domain modelling of the noisy electromagnetic fields radiated from complex circuit boards is investigated. The time-domain analysis of stochastic EM fields is based on Jefimenko's equations yielding the electric field and the magnetic flux density caused by a charge density and current density. We introduce a four-dimensional source vector by summarizing the source current density and the source charge density into a four-dimensional source vector.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122360297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exceptional Points of Degeneracy induced in Uniform and Periodic Coupled Systems","authors":"Ahmed F. Abdelshafy, T. Mealy, Dmitry Oshmarin, M. Y. Nada, H. Kazemi, F. Capolino","doi":"10.1109/ICEAA.2019.8879227","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879227","url":null,"abstract":"Exceptional points of degeneracy (EPDs) are points in parameters space of a waveguide system where two or more eigenmode coalesce into a single degenerate eigenmode. EPDs are obtained in electromagnetic structures through proper engineering to one or more system parameters such as dielectric constant, structural dimensions, coupling coefficients, etc. At EPD, the matrix describing the evolution of the system (i.e. the system matrix in uniform waveguides or the transmission matrix in periodic waveguides) is defective which means it is either similar to a Jordan matrix or to a matrix containing a Jordan block. Such condition is achieved either through the involvement of gain and loss in parity-time (PT-) symmetric structures, or via periodicity in the system, for example. Moreover, uniform coupled waveguide can exhibit EPDs in their dispersion diagram by properly coupling evanescent modes to propagating modes, without the need to resort to loss and/or gain.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127987442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}