Pub Date : 2014-04-06DOI: 10.1109/EUCAP.2014.6902611
O. Borries, P. Meincke, E. Jørgensen, S. Sorensen, P. Hansen
The Multilevel Fast Multipole Method (MLFMM) allows for a reduced computational complexity when solving electromagnetic scattering problems. Combining this with the reduced number of unknowns provided by Higher-Order discretizations has proven to be a difficult task, with the general conclusion being that going above 2nd order is not worthwhile. In this paper, we challenge this conclusion, providing results that demonstrate the potential performance gains with Higher-Order MLFMM and showing some modifications to the traditional MLFMM that can benefit both Higher-Order and standard discretizations.
{"title":"Improved Multilevel Fast Multipole Method for Higher-Order discretizations","authors":"O. Borries, P. Meincke, E. Jørgensen, S. Sorensen, P. Hansen","doi":"10.1109/EUCAP.2014.6902611","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902611","url":null,"abstract":"The Multilevel Fast Multipole Method (MLFMM) allows for a reduced computational complexity when solving electromagnetic scattering problems. Combining this with the reduced number of unknowns provided by Higher-Order discretizations has proven to be a difficult task, with the general conclusion being that going above 2nd order is not worthwhile. In this paper, we challenge this conclusion, providing results that demonstrate the potential performance gains with Higher-Order MLFMM and showing some modifications to the traditional MLFMM that can benefit both Higher-Order and standard discretizations.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"11 1","pages":"3610-3614"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76098691","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 : 2014-04-06DOI: 10.1109/EUCAP.2014.6902499
S. Podilchak, M. Clénet, Y. Antar
This summary article focuses on the design and performance of a compact antenna unit for polarization recon-figurability. A four-element array of aperture coupled slots is employed, and each slot is fed by two microstrip lines defining an eight-port antenna unit. The slot array is also topped by a dielectric resonator antenna to hybridize radiation and improve gain and bandwidth while also reducing cross-polarization levels. The eight-port antenna is low-profile, compact (160 mm by 160 mm by 22 mm), and offers good radiation performance with a bandwidth of more than 35%. In addition, the planar feeding circuit for element excitation is covered by a back plate enclosure with integration on the underside of the antenna ground plane which allows for the possibilty of different polarization states. Measurements and simulations are in agreement and the compact antenna may be useful for satellite navigation systems, diplexing units, and other phased arrays for wireless communications, including polarization diversity, direction finding, and other beam steering applications.
{"title":"A hybrid dielectric resonator antenna with polarization-agility and wideband operation","authors":"S. Podilchak, M. Clénet, Y. Antar","doi":"10.1109/EUCAP.2014.6902499","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902499","url":null,"abstract":"This summary article focuses on the design and performance of a compact antenna unit for polarization recon-figurability. A four-element array of aperture coupled slots is employed, and each slot is fed by two microstrip lines defining an eight-port antenna unit. The slot array is also topped by a dielectric resonator antenna to hybridize radiation and improve gain and bandwidth while also reducing cross-polarization levels. The eight-port antenna is low-profile, compact (160 mm by 160 mm by 22 mm), and offers good radiation performance with a bandwidth of more than 35%. In addition, the planar feeding circuit for element excitation is covered by a back plate enclosure with integration on the underside of the antenna ground plane which allows for the possibilty of different polarization states. Measurements and simulations are in agreement and the compact antenna may be useful for satellite navigation systems, diplexing units, and other phased arrays for wireless communications, including polarization diversity, direction finding, and other beam steering applications.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"24 1","pages":"3162-3163"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86921749","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 : 2014-04-06DOI: 10.1109/EUCAP.2014.6901774
Martin Hitzler, S. Bader, C. Waldschmidt
In this paper important aspects concerning a probe based antenna characterization environment for frequencies up to 325 GHz are described. The flexibility to measure the far-field antenna diagram and to perform a near-field sampling is achieved by use of an industrial robot. In advance to the complete measurement setup verification, two main aspects of the new system are investigated. For the measurement of an antenna radiation pattern the receiving frequency converter is moved around the probe station with the Antenna Under Test (AUT). Therefore, the cables carrying the intermediate frequency signal are also in motion. The impact on the accuracy of the results is shown. Moreover an antenna gain calibration technique with a 3S-standard (three Shorts) for the probe deembedding and its precision are discussed.
{"title":"Key aspects of robot based antenna measurements at millimeter wave frequencies","authors":"Martin Hitzler, S. Bader, C. Waldschmidt","doi":"10.1109/EUCAP.2014.6901774","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6901774","url":null,"abstract":"In this paper important aspects concerning a probe based antenna characterization environment for frequencies up to 325 GHz are described. The flexibility to measure the far-field antenna diagram and to perform a near-field sampling is achieved by use of an industrial robot. In advance to the complete measurement setup verification, two main aspects of the new system are investigated. For the measurement of an antenna radiation pattern the receiving frequency converter is moved around the probe station with the Antenna Under Test (AUT). Therefore, the cables carrying the intermediate frequency signal are also in motion. The impact on the accuracy of the results is shown. Moreover an antenna gain calibration technique with a 3S-standard (three Shorts) for the probe deembedding and its precision are discussed.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"2 1","pages":"392-396"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88005130","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 : 2014-04-06DOI: 10.1109/EUCAP.2014.6902156
H. Kayano, T. Kumamoto, N. Shiokawa, T. Kawaguchi, K. Nakayama, Mitsuyoshi Shinonaga
We have proposed a 3 GHz band active phased array antenna with a high-sensitivity cryogenic receiving unit. The high-sensitivity cryogenic receiving unit has 8 receiving modules, and each module consists of a small high-Tc superconducting (HTS) filter and a cooled low noise amplifier (LNA). The vacuum chamber size of this cryogenic receiving unit is 152×180×119 mm. As shown in this paper, measured noise temperature of the cryogenic receiving unit cooled at 77 K improved to less than 1/3 as compared with the noise temperature of only LNA at room temperature. Then the active phased array antenna consisted of the high-sensitivity cryogenic receiving unit, array antenna with circular arrayed antenna elements, and combiner unit. The active phased array antenna realized beam scan angle between -45 degree and 45 degree in azimuth. Also measured results were good agreed with calculation results.
{"title":"8 Elements phased array antenna using superconducting receiving module","authors":"H. Kayano, T. Kumamoto, N. Shiokawa, T. Kawaguchi, K. Nakayama, Mitsuyoshi Shinonaga","doi":"10.1109/EUCAP.2014.6902156","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902156","url":null,"abstract":"We have proposed a 3 GHz band active phased array antenna with a high-sensitivity cryogenic receiving unit. The high-sensitivity cryogenic receiving unit has 8 receiving modules, and each module consists of a small high-Tc superconducting (HTS) filter and a cooled low noise amplifier (LNA). The vacuum chamber size of this cryogenic receiving unit is 152×180×119 mm. As shown in this paper, measured noise temperature of the cryogenic receiving unit cooled at 77 K improved to less than 1/3 as compared with the noise temperature of only LNA at room temperature. Then the active phased array antenna consisted of the high-sensitivity cryogenic receiving unit, array antenna with circular arrayed antenna elements, and combiner unit. The active phased array antenna realized beam scan angle between -45 degree and 45 degree in azimuth. Also measured results were good agreed with calculation results.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"115 1","pages":"1852-1853"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88079401","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 : 2014-04-06DOI: 10.1109/EUCAP.2014.6902266
Marie Rieche, D. Arndt, Alexander Ihlow, F. Pérez-Fontán, G. del Galdo
State-of-the-art statistical Land Mobile Satellite (LMS) channel models, which are valuable for their low computational complexity, produce time series of the received signal envelope. Commonly, such models consider different types of environment and different elevation angles of the satellite. However, they do not consider the driving direction, i.e., the azimuthal angle of the satellite. In this contribution we investigate the impact of the driving direction by utilizing an existing statistical satellite channel model. Thereby, the model parameters are derived via an image-based approach applied on the output of a hemispheric camera mounted on a vehicle. The model output, presented in terms of first order statistics shows a significant impact on received satellite signal and should therefore be taken into account for future channel models.
{"title":"Impact of driving direction on Land Mobile Satellite channel modeling","authors":"Marie Rieche, D. Arndt, Alexander Ihlow, F. Pérez-Fontán, G. del Galdo","doi":"10.1109/EUCAP.2014.6902266","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902266","url":null,"abstract":"State-of-the-art statistical Land Mobile Satellite (LMS) channel models, which are valuable for their low computational complexity, produce time series of the received signal envelope. Commonly, such models consider different types of environment and different elevation angles of the satellite. However, they do not consider the driving direction, i.e., the azimuthal angle of the satellite. In this contribution we investigate the impact of the driving direction by utilizing an existing statistical satellite channel model. Thereby, the model parameters are derived via an image-based approach applied on the output of a hemispheric camera mounted on a vehicle. The model output, presented in terms of first order statistics shows a significant impact on received satellite signal and should therefore be taken into account for future channel models.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"28 1","pages":"2268-2271"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86453491","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 : 2014-04-06DOI: 10.1109/EUCAP.2014.6901938
Wenfei Yin, S. Khamas, R. Hogg
A terahertz dipole antenna grown on a photonic-bandgap (PBG) GaAs substrate is presented. The desired PBG structure is utilized to reduce the thick GaAs substrates effects on the efficiency and the main beam direction. Simulated results show that a directivity of 8.7 dBi can be achieved in the upper half space with a considerably higher input impedance.
{"title":"Terahertz dipole antenna performance enhancement using a photonic-bandgap GaAs substrate","authors":"Wenfei Yin, S. Khamas, R. Hogg","doi":"10.1109/EUCAP.2014.6901938","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6901938","url":null,"abstract":"A terahertz dipole antenna grown on a photonic-bandgap (PBG) GaAs substrate is presented. The desired PBG structure is utilized to reduce the thick GaAs substrates effects on the efficiency and the main beam direction. Simulated results show that a directivity of 8.7 dBi can be achieved in the upper half space with a considerably higher input impedance.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"62 1","pages":"1015-1017"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86458135","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 : 2014-04-06DOI: 10.1109/EUCAP.2014.6902593
O. Iupikov, M. Ivashina, K. Pontoppidan, P. Nielsen, C. Cappellin, N. Skou, S. S. Sobjarg, A. Ihle, D. Hartmann, K. Klooster
Performance of a dense focal plane array feeding an offset toroidal reflector antenna system is studied and discussed in the context of a potential application in multi-beam radiometers for ocean surveillance. We present a preliminary design of the array feed for the 5-m diameter antenna at X-band. This array is optimized to realize high antenna beam efficiency (~ 95%) over a wide scan range (±20°) with very low side-lobe and cross-polarization levels.
{"title":"Dense focal plane arrays for pushbroom satellite radiometers","authors":"O. Iupikov, M. Ivashina, K. Pontoppidan, P. Nielsen, C. Cappellin, N. Skou, S. S. Sobjarg, A. Ihle, D. Hartmann, K. Klooster","doi":"10.1109/EUCAP.2014.6902593","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902593","url":null,"abstract":"Performance of a dense focal plane array feeding an offset toroidal reflector antenna system is studied and discussed in the context of a potential application in multi-beam radiometers for ocean surveillance. We present a preliminary design of the array feed for the 5-m diameter antenna at X-band. This array is optimized to realize high antenna beam efficiency (~ 95%) over a wide scan range (±20°) with very low side-lobe and cross-polarization levels.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"16 1","pages":"3536-3540"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82651626","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 : 2014-04-06DOI: 10.1109/EUCAP.2014.6902397
D. Zelenchuk, V. Fusco
This paper presents an approach to improve the detection of an artificial target with low radar cross-section in presence of clutter. The target proposed in the paper modulates the phase response of the circularly polarized incident signal by means of rotation. The same physical phenomenon can be used to steer the modulated response in a non-specular direction. The bi-static measurements of the response of the target have demonstrated good agreement with theoretical prediction as well as with full-wave simulation.
{"title":"Detection of an artificial target with low radar cross-section in presence of backscatter","authors":"D. Zelenchuk, V. Fusco","doi":"10.1109/EUCAP.2014.6902397","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902397","url":null,"abstract":"This paper presents an approach to improve the detection of an artificial target with low radar cross-section in presence of clutter. The target proposed in the paper modulates the phase response of the circularly polarized incident signal by means of rotation. The same physical phenomenon can be used to steer the modulated response in a non-specular direction. The bi-static measurements of the response of the target have demonstrated good agreement with theoretical prediction as well as with full-wave simulation.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"12 1","pages":"2761-2764"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82916962","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 : 2014-04-06DOI: 10.1109/EUCAP.2014.6902602
A. Guraliuc, M. Zhadobov, G. Valério, N. Chahat, R. Sauleau
This study deals with the characterization of propagation along the body at 60 GHz. An analytical model based on Green's function representation is proposed for an infinitesimal dipole radiating over the surface of a multilayer structure representing skin and clothing layers. Further, the textile effect on the propagation between two open-ended waveguides along a layered structure is experimentally investigated.
{"title":"Characterization of the body-centric propagation channel at 60 GHz in the presence of textiles","authors":"A. Guraliuc, M. Zhadobov, G. Valério, N. Chahat, R. Sauleau","doi":"10.1109/EUCAP.2014.6902602","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902602","url":null,"abstract":"This study deals with the characterization of propagation along the body at 60 GHz. An analytical model based on Green's function representation is proposed for an infinitesimal dipole radiating over the surface of a multilayer structure representing skin and clothing layers. Further, the textile effect on the propagation between two open-ended waveguides along a layered structure is experimentally investigated.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"105 1","pages":"3575-3577"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86577563","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 : 2014-04-06DOI: 10.1109/EUCAP.2014.6902541
C. Zekios, P. Allilomes, M. Chryssomallis, P. Gkonis, I. Venieris, G. Kyriacou
In this work the performance and behavior of nonlinear eigenanalysis algorithms on formulation based on the Finite Element Method (FEM) is investigated for structures operating in THz. A technique like the tree-cotree splitting formulation method for the suppression of non-physical solution, the enhancement of the numerical stability and efficiency, is incorporated. Accurate global mesh truncation techniques are also adopted and refined for the eigenanalysis of open structures.
{"title":"A Finite Element eigenanalysis of electrically large THz and photonic structures","authors":"C. Zekios, P. Allilomes, M. Chryssomallis, P. Gkonis, I. Venieris, G. Kyriacou","doi":"10.1109/EUCAP.2014.6902541","DOIUrl":"https://doi.org/10.1109/EUCAP.2014.6902541","url":null,"abstract":"In this work the performance and behavior of nonlinear eigenanalysis algorithms on formulation based on the Finite Element Method (FEM) is investigated for structures operating in THz. A technique like the tree-cotree splitting formulation method for the suppression of non-physical solution, the enhancement of the numerical stability and efficiency, is incorporated. Accurate global mesh truncation techniques are also adopted and refined for the eigenanalysis of open structures.","PeriodicalId":22362,"journal":{"name":"The 8th European Conference on Antennas and Propagation (EuCAP 2014)","volume":"45 1","pages":"3331-3334"},"PeriodicalIF":0.0,"publicationDate":"2014-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86774968","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}
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