Pub Date : 2010-12-03DOI: 10.1109/ICEAA.2010.5652258
M. Hyde, M. Havrilla
The purpose of this paper is to demonstrate how the flanged-waveguide material-characterization technique, originally designed to characterize lossy materials only, can be extended to accurately extract permittivity and permeability of low-loss materials. Provided in this paper is a summary of the flanged-waveguide technique. This is followed by a discussion of how time-domain gating can be utilized to mitigate the error introduced by waves reflected from the edges of the flanges. Furthermore, it is demonstrated that by utilizing timedomain gating, the cross-sectional dimensions of the flanges can be significantly reduced. Lastly, material measurement results of plexiglass are provided to validate the time-domain gating technique.
{"title":"Reducing the measurement footprint in the characterization of low-loss materials using the flanged-waveguide measurement geometry","authors":"M. Hyde, M. Havrilla","doi":"10.1109/ICEAA.2010.5652258","DOIUrl":"https://doi.org/10.1109/ICEAA.2010.5652258","url":null,"abstract":"The purpose of this paper is to demonstrate how the flanged-waveguide material-characterization technique, originally designed to characterize lossy materials only, can be extended to accurately extract permittivity and permeability of low-loss materials. Provided in this paper is a summary of the flanged-waveguide technique. This is followed by a discussion of how time-domain gating can be utilized to mitigate the error introduced by waves reflected from the edges of the flanges. Furthermore, it is demonstrated that by utilizing timedomain gating, the cross-sectional dimensions of the flanges can be significantly reduced. Lastly, material measurement results of plexiglass are provided to validate the time-domain gating technique.","PeriodicalId":375707,"journal":{"name":"2010 International Conference on Electromagnetics in Advanced Applications","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126390602","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}
Pub Date : 2010-12-03DOI: 10.1109/ICEAA.2010.5650761
M. Tobar, E. Ivanov, J. Hartnett, J. Le Floch, P. Stanwix
Research at the Frequency Standards and Metrology Laboratories at the University of Western Australia has involved the invention, creation and applications of precise frequency generation and measurement. In recent years we have pursued a range of research topics from tests of fundamental physics to commercial and space applications. The symbiotic relationship between applied and fundamental related research has been one of great importance and there are numerous examples of discoveries in both domains directly benefiting the other. Crucial to this work has been the development of sapphire oscillator technology, and the invention of various configurations of the thermal noise limited microwave interferometer.
{"title":"High precision microwave interferometers and oscillators for applied and fundamental physics applications","authors":"M. Tobar, E. Ivanov, J. Hartnett, J. Le Floch, P. Stanwix","doi":"10.1109/ICEAA.2010.5650761","DOIUrl":"https://doi.org/10.1109/ICEAA.2010.5650761","url":null,"abstract":"Research at the Frequency Standards and Metrology Laboratories at the University of Western Australia has involved the invention, creation and applications of precise frequency generation and measurement. In recent years we have pursued a range of research topics from tests of fundamental physics to commercial and space applications. The symbiotic relationship between applied and fundamental related research has been one of great importance and there are numerous examples of discoveries in both domains directly benefiting the other. Crucial to this work has been the development of sapphire oscillator technology, and the invention of various configurations of the thermal noise limited microwave interferometer.","PeriodicalId":375707,"journal":{"name":"2010 International Conference on Electromagnetics in Advanced Applications","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125969657","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}
Pub Date : 2010-12-03DOI: 10.1109/ICEAA.2010.5653857
T. Stefański, S. Benkler, N. Chavannes, N. Kuster
In this paper we evaluate the usability and performance of Open Computing Language (OpenCL) targeted for implementation of the Finite-Difference Time-Domain (FDTD) method. The simulation speed was compared to implementations based on alternative techniques of parallel processor programming. Moreover, the portability of OpenCL FDTD code between modern computing architectures was assessed. The average speed of OpenCL FDTD simulations on a GPU was about 1.1 times lower than a comparable CUDA based solver for domains with sizes varying from 503 to 4003 cells. Although OpenCL code dedicated to GPUs can be executed on multi-core CPUs, a direct porting does not provide satisfactory performance due to an application of architecture specific features in GPU code. Therefore, the OpenCL kernels of the developed FDTD code were optimized for multi-core CPUs. However, this improved OpenCL FDTD code was still about 1.5 to 2.5 times slower than the FDTD solver developed in the OpenMP parallel programming standard. The study concludes that, despite current performance drawbacks, the future potential of OpenCL is significant due to its flexibility and portability to various architectures.
{"title":"Parallel implementation of the Finite-Difference Time-Domain method in Open Computing Language","authors":"T. Stefański, S. Benkler, N. Chavannes, N. Kuster","doi":"10.1109/ICEAA.2010.5653857","DOIUrl":"https://doi.org/10.1109/ICEAA.2010.5653857","url":null,"abstract":"In this paper we evaluate the usability and performance of Open Computing Language (OpenCL) targeted for implementation of the Finite-Difference Time-Domain (FDTD) method. The simulation speed was compared to implementations based on alternative techniques of parallel processor programming. Moreover, the portability of OpenCL FDTD code between modern computing architectures was assessed. The average speed of OpenCL FDTD simulations on a GPU was about 1.1 times lower than a comparable CUDA based solver for domains with sizes varying from 503 to 4003 cells. Although OpenCL code dedicated to GPUs can be executed on multi-core CPUs, a direct porting does not provide satisfactory performance due to an application of architecture specific features in GPU code. Therefore, the OpenCL kernels of the developed FDTD code were optimized for multi-core CPUs. However, this improved OpenCL FDTD code was still about 1.5 to 2.5 times slower than the FDTD solver developed in the OpenMP parallel programming standard. The study concludes that, despite current performance drawbacks, the future potential of OpenCL is significant due to its flexibility and portability to various architectures.","PeriodicalId":375707,"journal":{"name":"2010 International Conference on Electromagnetics in Advanced Applications","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130481674","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}
Pub Date : 2010-12-03DOI: 10.1109/ICEAA.2010.5652305
J. Trotignon
Impedance probes, which are well known in geophysical prospection, in particular for ground permittivity investigations, have been successfully transposed to space plasmas. Transmitting and receiving electrodes are used for measuring on open circuit the dynamic impedance of the system at several fixed frequencies over a range that includes characteristic frequencies of the ambient plasma. The measurements are then interpreted using a suitable theory and the values of plasma parameters, such as the electron density, temperature, and possibly the relative velocity of the plasma and the spacecraft, can be deduced. To show how powerful this technique is, results obtained in the Earth's plasmasphere by the mutual impedance probe onboard ROSETTA are presented.
{"title":"Short electric-field antennae as diagnostic tools for space plasmas","authors":"J. Trotignon","doi":"10.1109/ICEAA.2010.5652305","DOIUrl":"https://doi.org/10.1109/ICEAA.2010.5652305","url":null,"abstract":"Impedance probes, which are well known in geophysical prospection, in particular for ground permittivity investigations, have been successfully transposed to space plasmas. Transmitting and receiving electrodes are used for measuring on open circuit the dynamic impedance of the system at several fixed frequencies over a range that includes characteristic frequencies of the ambient plasma. The measurements are then interpreted using a suitable theory and the values of plasma parameters, such as the electron density, temperature, and possibly the relative velocity of the plasma and the spacecraft, can be deduced. To show how powerful this technique is, results obtained in the Earth's plasmasphere by the mutual impedance probe onboard ROSETTA are presented.","PeriodicalId":375707,"journal":{"name":"2010 International Conference on Electromagnetics in Advanced Applications","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131580981","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}
Pub Date : 2010-12-03DOI: 10.1109/ICEAA.2010.5652998
L. Zou, C. Fumeaux
This paper presents a wideband circularly polarized (CP) dielectric resonator antenna (DRA). The thin cross-shaped antenna of high permittivity is excited by two orthogonal microstrip lines with 90° phase difference resulting in circular polarization. The general design principles are proposed in this paper and a commercial full field analysis software, based on Finite-Element-Method (FEM), is employed to fine-tune the proposed antenna. The experimental results show a good agreement with simulation and demonstrate a broadside CP bandwidth of 13.2%.
{"title":"High-permittivity cross-shaped dielectric resonator antenna for circular polarization","authors":"L. Zou, C. Fumeaux","doi":"10.1109/ICEAA.2010.5652998","DOIUrl":"https://doi.org/10.1109/ICEAA.2010.5652998","url":null,"abstract":"This paper presents a wideband circularly polarized (CP) dielectric resonator antenna (DRA). The thin cross-shaped antenna of high permittivity is excited by two orthogonal microstrip lines with 90° phase difference resulting in circular polarization. The general design principles are proposed in this paper and a commercial full field analysis software, based on Finite-Element-Method (FEM), is employed to fine-tune the proposed antenna. The experimental results show a good agreement with simulation and demonstrate a broadside CP bandwidth of 13.2%.","PeriodicalId":375707,"journal":{"name":"2010 International Conference on Electromagnetics in Advanced Applications","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131640547","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}
Pub Date : 2010-12-03DOI: 10.1109/ICEAA.2010.5648825
R. Lehmensiek, I. Theron
The design of a wideband orthomode transducer (OMT) with an integrated directional coupler for radio astronomy applications in the frequency range 900 MHz to 1760 MHz is presented. The OMT has very low insertion and transmission losses, good isolation, and is of small size.
{"title":"Compact low loss L-band orthomode transducer","authors":"R. Lehmensiek, I. Theron","doi":"10.1109/ICEAA.2010.5648825","DOIUrl":"https://doi.org/10.1109/ICEAA.2010.5648825","url":null,"abstract":"The design of a wideband orthomode transducer (OMT) with an integrated directional coupler for radio astronomy applications in the frequency range 900 MHz to 1760 MHz is presented. The OMT has very low insertion and transmission losses, good isolation, and is of small size.","PeriodicalId":375707,"journal":{"name":"2010 International Conference on Electromagnetics in Advanced Applications","volume":"131 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131650628","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}
Pub Date : 2010-12-03DOI: 10.1109/ICEAA.2010.5652962
M. Ivashina, O. Iupikov, W. Cappellen
This paper describes a numerical approach for the analysis of a reflector antenna system which is fed by a Phased Array Feed. This approach takes mutual interaction effects into account between the antenna array and the low noise amplifiers in the evaluation of the system sensitivity and optimization of the beamformer weights, and can be used when several signal and noise sources are present on the sky, ground, and inside the system itself. The described methodology has been applied to a practical PAF (comprising 144 tapered slot antennas operating from 1 to 1.75 GHz) which is installed at a 25-m reflector antenna. Comparison of numerical and experimental results shows a good agreement.
{"title":"Extending the capabilities of the GRASP and CAESAR software to analyze and optimize active beamforming array feeds for reflector systems","authors":"M. Ivashina, O. Iupikov, W. Cappellen","doi":"10.1109/ICEAA.2010.5652962","DOIUrl":"https://doi.org/10.1109/ICEAA.2010.5652962","url":null,"abstract":"This paper describes a numerical approach for the analysis of a reflector antenna system which is fed by a Phased Array Feed. This approach takes mutual interaction effects into account between the antenna array and the low noise amplifiers in the evaluation of the system sensitivity and optimization of the beamformer weights, and can be used when several signal and noise sources are present on the sky, ground, and inside the system itself. The described methodology has been applied to a practical PAF (comprising 144 tapered slot antennas operating from 1 to 1.75 GHz) which is installed at a 25-m reflector antenna. Comparison of numerical and experimental results shows a good agreement.","PeriodicalId":375707,"journal":{"name":"2010 International Conference on Electromagnetics in Advanced Applications","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131796827","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}
Pub Date : 2010-12-03DOI: 10.1109/ICEAA.2010.5652252
Shiquan He, Z. Nie
To calculate the scattering from thin dielectric-coated perfect electric conductor (PEC) surfaces, the impedance boundary conditions (IBC) and thin dielectric sheet (TDS) approximation are quite powerful in integral equation method because both remove the need to solve the field in dielectric layer. However, the rigid validation criteria restrict the application scope of IBC method. Although the TDS approximation removes physical restrictions by basing on the rigorous integral formulation, only electric material coating have been considered in available literatures. This paper gives an introduction of our progress in the calculation for dielectric-coated PEC surfaces with thin dielectric approximation, including the hybrid PEC-dielectric formulations to deal with the coating with electric and magnetic materials; the multi-layer TDS approximation to analyze coatings with relatively large thickness; the utilization of phase extracted basis functions for electrically large and smooth PEC coatings and some special treatments near the edges to account for the singularity currents for open PEC surfaces.
{"title":"Accurate and fast calculation for dielectric-coated PEC surfaces with thin dielectric approximations","authors":"Shiquan He, Z. Nie","doi":"10.1109/ICEAA.2010.5652252","DOIUrl":"https://doi.org/10.1109/ICEAA.2010.5652252","url":null,"abstract":"To calculate the scattering from thin dielectric-coated perfect electric conductor (PEC) surfaces, the impedance boundary conditions (IBC) and thin dielectric sheet (TDS) approximation are quite powerful in integral equation method because both remove the need to solve the field in dielectric layer. However, the rigid validation criteria restrict the application scope of IBC method. Although the TDS approximation removes physical restrictions by basing on the rigorous integral formulation, only electric material coating have been considered in available literatures. This paper gives an introduction of our progress in the calculation for dielectric-coated PEC surfaces with thin dielectric approximation, including the hybrid PEC-dielectric formulations to deal with the coating with electric and magnetic materials; the multi-layer TDS approximation to analyze coatings with relatively large thickness; the utilization of phase extracted basis functions for electrically large and smooth PEC coatings and some special treatments near the edges to account for the singularity currents for open PEC surfaces.","PeriodicalId":375707,"journal":{"name":"2010 International Conference on Electromagnetics in Advanced Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130752169","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}
Pub Date : 2010-12-03DOI: 10.1109/ICEAA.2010.5653709
T. Merkle, S. Smith, N. Nikolic, K. Smart, M. Shen
An E-band aperture coupled patch antenna using a combination of GaAs and liquid crystal polymer (LCP) substrates packaged with a laminated multi-chip module (MCM-L) process is presented in this paper. The antenna offers an electromagnetic interface between a GaAs MMIC and a separate dielectric antenna package. Design, manufacture, packaging and test results of the proposed antenna are presented. Measurement of a waveguide to microstrip transition used in the testing of the antenna is presented with excellent performance obtained across the E-band. Further analysis of the packaging method is required to assess the unpredicted loss observed in the measurements.
{"title":"E-band aperture coupled GaAs / LCP antennas","authors":"T. Merkle, S. Smith, N. Nikolic, K. Smart, M. Shen","doi":"10.1109/ICEAA.2010.5653709","DOIUrl":"https://doi.org/10.1109/ICEAA.2010.5653709","url":null,"abstract":"An E-band aperture coupled patch antenna using a combination of GaAs and liquid crystal polymer (LCP) substrates packaged with a laminated multi-chip module (MCM-L) process is presented in this paper. The antenna offers an electromagnetic interface between a GaAs MMIC and a separate dielectric antenna package. Design, manufacture, packaging and test results of the proposed antenna are presented. Measurement of a waveguide to microstrip transition used in the testing of the antenna is presented with excellent performance obtained across the E-band. Further analysis of the packaging method is required to assess the unpredicted loss observed in the measurements.","PeriodicalId":375707,"journal":{"name":"2010 International Conference on Electromagnetics in Advanced Applications","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132432515","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}
Pub Date : 2010-12-03DOI: 10.1109/ICEAA.2010.5652945
Y. Ge, K. Esselle, T. Bird
A method to design ultra-wideband dielectric resonator antennas is described. The volume of the antenna is further reduced by employing the standard conducting mirror wall technique. The effectiveness of the method is demonstrated using HFSS simulations.
{"title":"Compact broadband dielectric resonator antennas","authors":"Y. Ge, K. Esselle, T. Bird","doi":"10.1109/ICEAA.2010.5652945","DOIUrl":"https://doi.org/10.1109/ICEAA.2010.5652945","url":null,"abstract":"A method to design ultra-wideband dielectric resonator antennas is described. The volume of the antenna is further reduced by employing the standard conducting mirror wall technique. The effectiveness of the method is demonstrated using HFSS simulations.","PeriodicalId":375707,"journal":{"name":"2010 International Conference on Electromagnetics in Advanced Applications","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133137838","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：