L. Scorrano, S. Maddio, Gerardo Pelosi, S. Selleri
{"title":"Antennaless 3D Sensors for Direction of Arrival estimation Based on Rydberg Atoms","authors":"L. Scorrano, S. Maddio, Gerardo Pelosi, S. Selleri","doi":"10.23919/URSIGASS51995.2021.9560547","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560547","url":null,"abstract":"Antenna-arrays for Direction-of-Arrival (DOA) estimate are heavily limited by mutual coupling among sensors and between sensors and the installation environment. Huge efforts are devoted for calibration-based techniques that result not always decisive about compensating these unwanted coupling effects. In this paper we describe a possible application of Rydberg-atoms based sensors in the field of the DOA estimation. A principle fully-dielectric miniaturized 3D interferometer is presented, capable of providing both azimuth and elevation estimate of an incoming electromagnetic (EM) wave front thus overcoming the aforementioned limitations due to metal-based EM sensors (i.e. antennas).","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124535752","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}
Marie T. Conte, E. Giampietri, D. Brizi, A. Monorchio
{"title":"A High-Impedance Surface for Improving Performance of Microwave Imaging Antennas for Biomedical Applications","authors":"Marie T. Conte, E. Giampietri, D. Brizi, A. Monorchio","doi":"10.23919/URSIGASS51995.2021.9560359","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560359","url":null,"abstract":"In this paper we introduce a high impedance surface for improving performance of antennas employed in biomedical Microwave Imaging (MWI). We first design a standard bow-tie antenna, commonly adopted in MWI, by using a commercial numerical electromagnetic solver. Then, we develop the high impedance surface to be placed behind the proposed bow-tie. The numerical simulations demonstrated that the use of the high impedance surface implies an excellent improvement in the electromagnetic energy delivery inside a biological phantom, quantifiable by a significantly higher coupling between two opposite radiating elements. This study can pave the way in the use of high impedance surfaces within the uprising topic of Microwave Imaging for clinical purposes.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"501 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114448559","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":"Electromagnetic Scattering by Magnetic Biaxial Cylinders","authors":"Konstantinos Katsinos, G. P. Zouros","doi":"10.23919/URSIGASS51995.2021.9560363","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560363","url":null,"abstract":"In this work a volume integral equation method is proposed for the evaluation of the electromagnetic scattering by multilayered magnetic biaxial circular cylinders with infinite length. The key point of the proposed method is the expansion of the magnetic field and magnetic flux density in Dini-type cylindrical vector wave functions, which consitute an orthogonal vectorial basis in the transversal circular cross section of the cylinder. These expansions reduce the two-dimensional volumetric-type integrals to sets of algebraic equations. The cylinder is illuminated by a normally impinging, on cylinder's axis, plane wave. Both types of $H$-and $E$-wave polarization of the incident plane wave are considered. The formalism used in this method allows for an easy and direct incorporation of the multilayered magnetic biaxial permeability profiles through the constitutive relations. The method is validated by comparison of the normalized scattering cross section with the exact solution for the case of uniaxial anisotropy. Moreover, we employ HFSS commercial software to verify our results for homogeneous and inhomogeneous magnetic biaxial profiles.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114729609","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}
Guillaume Dehan, Hélène Galiègue, F. Issac, A. Chabory
{"title":"Laboratory testing and on-site experiments to characterize Corona discharges in VHF-band","authors":"Guillaume Dehan, Hélène Galiègue, F. Issac, A. Chabory","doi":"10.23919/URSIGASS51995.2021.9560534","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560534","url":null,"abstract":"Corona discharges have been designated as aeronautical VHF communications disturber. In order to better understand the discharges, the coupling phenomena involved and to propose an adequate protection for VHF systems, both laboratory testing and experiments on a 25 m high pylon are carried out here. Main characteristics of Corona pulses have been retrieved and analyzed wrt the experimental parameters. Leader propagation phenomena have also been identified.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"306 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116364904","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":"Millimeter-Wave Indoor Channel Characterization Based on Directional Measurements at 39 GHz and 70 GHz","authors":"Amar Al-jzari, Mohamed Abdulali, S. Salous","doi":"10.23919/URSIGASS51995.2021.9560353","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560353","url":null,"abstract":"This paper presents results of wideband channel measurements at 39 GHz and 70 GHz in a typical indoor office environment. Measurements were carried out using Durham University's multi-band frequency modulated continuous wave channel sounder. The propagation characteristics at different angular orientations are estimated and compared for both frequency bands. The effects of the antenna pattern on the propagation channel parameters such as the average power delay profile, root mean square delay spread, and angular spread, are analyzed. The results show similar propagation properties for both measured bands.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"178 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124414228","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":"Self-Phased Metasurface Pixels/Cells: Concept, Design and Applications","authors":"Quang M. Nguyen, J. Hodge, A. Zaghloul","doi":"10.23919/URSIGASS51995.2021.9560456","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560456","url":null,"abstract":"Metasurfaces can be categorized into two types, i.e., transmission-type and reflection-type. In general, they allow electromagnetic waves either to be transmitted or reflected with the manipulation in phase and or amplitude. The transmission/reflection phase can also be tuned by incorporating active circuit elements into the metasurface pixels/cells' design. This paper presents a self-phased metasurface pixel/cell concept that mainly focuses on the tunability in both the transmission and reflection phase without using lossy active circuit elements. The tunable phase can be realized by using constituent material as the substrate supporting the metasurface. In transmission-type, we propose a unit cell design that consists of three layers of a metallic ring surrounding a metallic patch; all are integrated into a constituent material used as substrates. In reflection-type, the presented pixel/cell design consists of a dual-circular ring, incorporating a meandered slot line, or an interdigitated line, in between. All are also integrated on a dielectric layer with a metal backing used as a constituent material. Simulation results show that the designed unit cells can achieve over 220 degrees of tunable phase with an insertion loss of less than 3 dB in the transmission configuration and 220 degrees of tunable phase with less than 2 dB loss in the reflection configuration. The proposed concept is implemented to design the reconfigurable transmit and reflectarray without lossy phase shifters or active circuit elements.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129859193","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}
M. Ryabkova, V. Titov, Yu. L. Titchenko, E. Meshkov, V. Karaev, A. Yablokov, K. Ponur, R. Belyaev, M. Panfilova
{"title":"Measurements of the Sea Surface Waves Parameters and the Doppler Spectrum of the Reflected Signal Using Optical and Acoustic Remote Sensing Methods","authors":"M. Ryabkova, V. Titov, Yu. L. Titchenko, E. Meshkov, V. Karaev, A. Yablokov, K. Ponur, R. Belyaev, M. Panfilova","doi":"10.23919/URSIGASS51995.2021.9560283","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560283","url":null,"abstract":"Active and passive remote sensing techniques can be used simultaneously and their results complete each other. This paper introduces the results of the experiment that took place in October 2019 on the offshore platform in the Black Sea. Two unique pieces of equipment developed in the Institute of Applied Physics were used in the experiment: set of original optical devices for recording of range - time - intensity (RTI) images of sea surface and an underwater acoustic wave gauge. The devices were installed close to each other, optical devices were measuring slope spectrum, acoustic wave gauge can measure significant wave height and variance of slopes of the large-scale (in comparison with the wavelength of the incidence acoustic wave) waves, also the Doppler spectrum of the reflected signal can be measured. The string wave gauge is working on the platform constantly and provides measurements of the omnidirectional spectrum.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128378939","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}
B. Censier, I. Thomas, G. Auxepaules, B. Flouret, P. Renaud
{"title":"Sky modeling for correction and calibration of a single VHF antenna system for interferences monitoring","authors":"B. Censier, I. Thomas, G. Auxepaules, B. Flouret, P. Renaud","doi":"10.23919/URSIGASS51995.2021.9560246","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560246","url":null,"abstract":"Using a VHF dipole antenna built for the 10-100MHz band and used for RFI monitoring of the Nancay radioastronomy station site, we investigate the influence of the sky signal on the observed power. The latter is seen as a power modulation at a period of one sideral day in long term monitoring data. By use of a sky and antenna model, a simulated receiver temperature due to sky only is estimated. That model fits the time modulation very well and is used it fot excision of the sky signal and calibration of the power scale in Kelvin units. An example application of calibration and correction is shown on an observed spectrum.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128163902","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":"LATPROP Radar Modifications for CLASI Experiment","authors":"DeGrafth A. Palmore, C. Yardim","doi":"10.23919/URSIGASS51995.2021.9560205","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560205","url":null,"abstract":"This paper describes the modifications made to a commercially available marine radar and how it was retrofitted to measure Refractivity-from-Clutter (RFC) from the sea surface in order to better understand atmospheric refractivity profiles. A Koden MDS63R marine radar was updated with a horizontal and vertically polarized 3 meter dish antenna that has a 48 dB gain, two options for PRF and pulse width, both long and short, the ability to discretely step in both azimuth and elevation to study 2-D spatial mapping and grazing angle respectively and the capability to preform Coherent-on-Receive (CoR) integration.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128170696","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}
Rodrigo Silva Rezende, Mirsad Hadžiefendić, R. Schuhmann
{"title":"Multi-Output Variable-Fidelity Surrogate Modeling for Microwave Components Design","authors":"Rodrigo Silva Rezende, Mirsad Hadžiefendić, R. Schuhmann","doi":"10.23919/URSIGASS51995.2021.9560605","DOIUrl":"https://doi.org/10.23919/URSIGASS51995.2021.9560605","url":null,"abstract":"This paper proposes a Gaussian processes-based modeling technique for handling multi-output (frequency-dependent vector-valued) microwave systems, in which variable-fidelity data is available. This approach assumes that each frequency point has its own mean and covariance, which are independent of the ones of other frequencies, and a unique correlation matrix describes the full frequency range. Using these assumptions can significantly reduce the number of matrix calculations required by the maximum likelihood estimation of the data. The notable advantage of this proposed approach is the capability of modeling systems with multi-output responses without requiring any pre-conditioning of the data while keeping a high accuracy, which is especially useful in the microwave design. The proposed methodology is demonstrated for a parameterized PCB connector design and compared against usual surrogate modeling approaches.","PeriodicalId":152047,"journal":{"name":"2021 XXXIVth General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129543955","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}