Pub Date : 2016-06-30DOI: 10.1109/APS.2016.7696519
A. Dubok, A. Al-Rawi, M. Herben, G. Gerini, A. B. Smolders
A mathematical analysis of reflector shaping for wide-angle scanning is presented. Parabolic, hyperbolic and spherical reflectors are defined based on geometrical optics method in order to have the smallest deviation of the focused beam (Fig. 1) during wide-angle scanning. It is shown that it is possible to expand the illuminated region of the array by a factor 3 for parabolic reflectors with axial displacement based on an estimated 80 % aperture efficiency at 30 GHz, D/λ=80. Moreover, it is demonstrated that spherical reflector have the smallest deviation from the axis of revolution during wide-angle scanning.
{"title":"Wide-angle scanning reflector configuration for focal plane arrays","authors":"A. Dubok, A. Al-Rawi, M. Herben, G. Gerini, A. B. Smolders","doi":"10.1109/APS.2016.7696519","DOIUrl":"https://doi.org/10.1109/APS.2016.7696519","url":null,"abstract":"A mathematical analysis of reflector shaping for wide-angle scanning is presented. Parabolic, hyperbolic and spherical reflectors are defined based on geometrical optics method in order to have the smallest deviation of the focused beam (Fig. 1) during wide-angle scanning. It is shown that it is possible to expand the illuminated region of the array by a factor 3 for parabolic reflectors with axial displacement based on an estimated 80 % aperture efficiency at 30 GHz, D/λ=80. Moreover, it is demonstrated that spherical reflector have the smallest deviation from the axis of revolution during wide-angle scanning.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"239 1","pages":"1625-1626"},"PeriodicalIF":0.0,"publicationDate":"2016-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73709608","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 : 2016-06-29DOI: 10.1109/APS.2016.7696157
K. Yinusa, W. Elmarissi, S. Caizzone, A. Dreher
The position accuracy in satellite navigation is enhanced when low elevation satellites are included in the triangulation due to the contribution of satellite geometry. Moreover, improved reception of low elevation signals leads to a higher overall system availability. However, the receiving antenna characteristics usually suffer from low-gain and high axial ratios at low elevations. In this contribution, an antenna array conformal to a spherical cap is presented. The array consists of a single antenna on top of the cap and six, radially directed, equally spaced elements on a ring. The manufactured antenna achieves a gain between 0 dB and 4 dB with low axial ratio in the forward hemisphere at the E5a/b and E1 center frequencies of 1.176 GHz, 1.207 GHz and 1.575 GHz, respectively.
{"title":"A multi-band conformai antenna array for GNSS applications","authors":"K. Yinusa, W. Elmarissi, S. Caizzone, A. Dreher","doi":"10.1109/APS.2016.7696157","DOIUrl":"https://doi.org/10.1109/APS.2016.7696157","url":null,"abstract":"The position accuracy in satellite navigation is enhanced when low elevation satellites are included in the triangulation due to the contribution of satellite geometry. Moreover, improved reception of low elevation signals leads to a higher overall system availability. However, the receiving antenna characteristics usually suffer from low-gain and high axial ratios at low elevations. In this contribution, an antenna array conformal to a spherical cap is presented. The array consists of a single antenna on top of the cap and six, radially directed, equally spaced elements on a ring. The manufactured antenna achieves a gain between 0 dB and 4 dB with low axial ratio in the forward hemisphere at the E5a/b and E1 center frequencies of 1.176 GHz, 1.207 GHz and 1.575 GHz, respectively.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"101 1","pages":"897-898"},"PeriodicalIF":0.0,"publicationDate":"2016-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80610247","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 : 2016-06-26DOI: 10.1109/APS.2016.7696439
I. Iliopoulos, M. Ettorre, R. Sauleau, M. Casaletti, P. Potier, P. Pouliguen
In this work a methodology to shape the near field of radiating apertures is presented. The technique, despite being generic, is applied to the specific scenario of shaping the focal pattern of a 12λ focusing aperture at 30 GHz. The main result comprises the capability to shrink/enlarge the focal depth, without affecting the spot diameter. To verify the concept, the acquired aperture distribution is mapped on a Radial Line Slot Antenna (RLSA), which has been manufactured and measured, showing excellent results.
{"title":"3D focal spot manipulation at millimeter waves","authors":"I. Iliopoulos, M. Ettorre, R. Sauleau, M. Casaletti, P. Potier, P. Pouliguen","doi":"10.1109/APS.2016.7696439","DOIUrl":"https://doi.org/10.1109/APS.2016.7696439","url":null,"abstract":"In this work a methodology to shape the near field of radiating apertures is presented. The technique, despite being generic, is applied to the specific scenario of shaping the focal pattern of a 12λ focusing aperture at 30 GHz. The main result comprises the capability to shrink/enlarge the focal depth, without affecting the spot diameter. To verify the concept, the acquired aperture distribution is mapped on a Radial Line Slot Antenna (RLSA), which has been manufactured and measured, showing excellent results.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"49 1","pages":"1465-1466"},"PeriodicalIF":0.0,"publicationDate":"2016-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82292890","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 : 2016-06-26DOI: 10.1109/APS.2016.7696027
O. Makhlouf, M. Cueille, J. Dubard
To simulate the temperature elevation in biological tissues exposed to the electromagnetic waves, the thermal aspect must be taken into account by solving the bioheat equation. In this paper, a new numerical scheme based on the TLM method, particularly suitable to highly heterogeneous environments, is applied for computing thermal distribution in a human head exposed to plane wave at 900 MHz. The model was proven to be unconditionally stable which allows using a larger time step than the one involved with FDTD or other TLM models. The numerical results are compared with those simulated with CST.
{"title":"TLM computation of temperature distribution in human head exposed to electromagnetic waves","authors":"O. Makhlouf, M. Cueille, J. Dubard","doi":"10.1109/APS.2016.7696027","DOIUrl":"https://doi.org/10.1109/APS.2016.7696027","url":null,"abstract":"To simulate the temperature elevation in biological tissues exposed to the electromagnetic waves, the thermal aspect must be taken into account by solving the bioheat equation. In this paper, a new numerical scheme based on the TLM method, particularly suitable to highly heterogeneous environments, is applied for computing thermal distribution in a human head exposed to plane wave at 900 MHz. The model was proven to be unconditionally stable which allows using a larger time step than the one involved with FDTD or other TLM models. The numerical results are compared with those simulated with CST.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"53 1","pages":"637-638"},"PeriodicalIF":0.0,"publicationDate":"2016-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76120253","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 : 2016-06-26DOI: 10.1109/APS.2016.7696396
P. Focardi, P. Brown
Being developed in partnership between NASA and the Indian Space Research Organisation (ISRO), the NASA-ISRO Synthetic Aperture Radar (NISAR) satellite is planned to launch in late 2020. NISAR will measure many aspects of how Earth is changing with unprecedented accuracy on a global scale from a Low Earth Orbit (LEO) platform. With a 12m deployable mesh reflector, NISAR will feature one of the largest deployable mesh reflector ever launched for a scientific mission. Two large planar phased arrays will feed the reflector, one that will operate at L-Band and be developed by the Jet Propulsion Laboratory (JPL), and an S-band array that will be developed at the ISRO Space Application Centre (SAC). This paper describes the preliminary design of the L-Band feed array.
{"title":"NISAR L-Band feed antenna tiles, preliminary design","authors":"P. Focardi, P. Brown","doi":"10.1109/APS.2016.7696396","DOIUrl":"https://doi.org/10.1109/APS.2016.7696396","url":null,"abstract":"Being developed in partnership between NASA and the Indian Space Research Organisation (ISRO), the NASA-ISRO Synthetic Aperture Radar (NISAR) satellite is planned to launch in late 2020. NISAR will measure many aspects of how Earth is changing with unprecedented accuracy on a global scale from a Low Earth Orbit (LEO) platform. With a 12m deployable mesh reflector, NISAR will feature one of the largest deployable mesh reflector ever launched for a scientific mission. Two large planar phased arrays will feed the reflector, one that will operate at L-Band and be developed by the Jet Propulsion Laboratory (JPL), and an S-band array that will be developed at the ISRO Space Application Centre (SAC). This paper describes the preliminary design of the L-Band feed array.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"7 1","pages":"1379-1380"},"PeriodicalIF":0.0,"publicationDate":"2016-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88986515","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 : 2016-06-26DOI: 10.1109/APS.2016.7696230
S. Koulouridis, Sofia Bakogianni, A. Diet, Y. Le Bihan, L. Pichon
A human tissue-implantable rectenna that is intended for wireless data telemetry and power transmission operation is considered. To that end, a compact-size planar inverted F-antenna (PIFA) that initially operates within the Medical Device Radiocommunications Service (MedRadio, 402-405 MHz) and the industrial, scientific and medical (ISM, 902.8-928 MHz) bands is considered in order to evaluate advantages and disadvantages of radiating versus inductive power harvesting at sub-GHz region. The inductive coupling is carried out in MHz region in order to employ very small (mm-diameter). The scenario considered focuses on implants embedded in depths higher than 10mm. The analysis is carried out inside the muscle tissue of a cylindrical three-layered phantom representing the human arm. The Specific Absorption Rate (SAR) performance of the implanted system is assessed. The RF-to-DC conversion efficiency is also taken into account.
{"title":"Investigation of efficient wireless charging for deep implanted medical devices","authors":"S. Koulouridis, Sofia Bakogianni, A. Diet, Y. Le Bihan, L. Pichon","doi":"10.1109/APS.2016.7696230","DOIUrl":"https://doi.org/10.1109/APS.2016.7696230","url":null,"abstract":"A human tissue-implantable rectenna that is intended for wireless data telemetry and power transmission operation is considered. To that end, a compact-size planar inverted F-antenna (PIFA) that initially operates within the Medical Device Radiocommunications Service (MedRadio, 402-405 MHz) and the industrial, scientific and medical (ISM, 902.8-928 MHz) bands is considered in order to evaluate advantages and disadvantages of radiating versus inductive power harvesting at sub-GHz region. The inductive coupling is carried out in MHz region in order to employ very small (mm-diameter). The scenario considered focuses on implants embedded in depths higher than 10mm. The analysis is carried out inside the muscle tissue of a cylindrical three-layered phantom representing the human arm. The Specific Absorption Rate (SAR) performance of the implanted system is assessed. The RF-to-DC conversion efficiency is also taken into account.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"73 1","pages":"1045-1046"},"PeriodicalIF":0.0,"publicationDate":"2016-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85994024","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 : 2016-06-26DOI: 10.1109/APS.2016.7696412
L. Di Palma, A. Clemente, L. Dussopt, R. Sauleau, P. Potier, P. Pouliguen
In this contribution, we propose a new reconfigurable unit-cell design operating in circular polarization in Ka-band. Two p-i-n diodes are integrated in order to achieve a phase resolution of 1 bit (0°/180° are the possible phase states). An insertion loss of about 1 dB at 29 GHz with a 3-dB relative bandwidth of 14.5% has been numerically demonstrated.
{"title":"Circularly-polarized reconfigurable unit-cell for transmitarray applications in Ka-band","authors":"L. Di Palma, A. Clemente, L. Dussopt, R. Sauleau, P. Potier, P. Pouliguen","doi":"10.1109/APS.2016.7696412","DOIUrl":"https://doi.org/10.1109/APS.2016.7696412","url":null,"abstract":"In this contribution, we propose a new reconfigurable unit-cell design operating in circular polarization in Ka-band. Two p-i-n diodes are integrated in order to achieve a phase resolution of 1 bit (0°/180° are the possible phase states). An insertion loss of about 1 dB at 29 GHz with a 3-dB relative bandwidth of 14.5% has been numerically demonstrated.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"166 1","pages":"1411-1412"},"PeriodicalIF":0.0,"publicationDate":"2016-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72691970","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 : 2016-06-26DOI: 10.1109/APS.2016.7696241
W. Moulder, Janusz J. Majewski, C. Coldwell, J. Krieger, J. Herd
A switched array tile which is part of a large aperture for near-field microwave imaging is presented. The tile is based on the Boundary Array (BA), a sparse array topology for hardware efficient realization of imaging apertures. The larger array formed with the tile samples a scene with no redundancy, and is compatible with fast imaging techniques. Details on the design and realization of the tile are presented, as well as experimental images formed with a tile prototype.
{"title":"Switched antenna array tile for real-time microwave imaging aperture","authors":"W. Moulder, Janusz J. Majewski, C. Coldwell, J. Krieger, J. Herd","doi":"10.1109/APS.2016.7696241","DOIUrl":"https://doi.org/10.1109/APS.2016.7696241","url":null,"abstract":"A switched array tile which is part of a large aperture for near-field microwave imaging is presented. The tile is based on the Boundary Array (BA), a sparse array topology for hardware efficient realization of imaging apertures. The larger array formed with the tile samples a scene with no redundancy, and is compatible with fast imaging techniques. Details on the design and realization of the tile are presented, as well as experimental images formed with a tile prototype.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"42 1","pages":"1067-1068"},"PeriodicalIF":0.0,"publicationDate":"2016-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86556687","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 : 2016-06-26DOI: 10.1109/APS.2016.7696648
Rene Baelemans, A. Sutinjo, P. Hall, B. Smolders
This paper presents the derivation of an explicit closed-form expression of dual-polarized inverted-vee dipole antenna behavior based upon electromagnetic theory and physical explanations. The expression is used to determine the intrinsic cross-polarization ratio (IXR) as function of the droop angle, position of the sky-vector, the height above a ground plane and frequency. The expression is verified using full-wave simulations with a Method-of-Moments solver, and shows excellent agreement with simulations. It explains the increase observed in IXR if an infinite perfect electric conductor ground plane is deployed.
{"title":"Analysis of the polarization properties of dual polarized inverted vee dipole antennas over a ground plane","authors":"Rene Baelemans, A. Sutinjo, P. Hall, B. Smolders","doi":"10.1109/APS.2016.7696648","DOIUrl":"https://doi.org/10.1109/APS.2016.7696648","url":null,"abstract":"This paper presents the derivation of an explicit closed-form expression of dual-polarized inverted-vee dipole antenna behavior based upon electromagnetic theory and physical explanations. The expression is used to determine the intrinsic cross-polarization ratio (IXR) as function of the droop angle, position of the sky-vector, the height above a ground plane and frequency. The expression is verified using full-wave simulations with a Method-of-Moments solver, and shows excellent agreement with simulations. It explains the increase observed in IXR if an infinite perfect electric conductor ground plane is deployed.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"34 18 1","pages":"1883-1884"},"PeriodicalIF":0.0,"publicationDate":"2016-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77238247","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 : 2016-06-26DOI: 10.1109/APS.2016.7696635
H. Foltz, O. Kegege, S. Altunc
Wideband antennas may be designed to have an impulse response that is direction dependent. This property can be used for angle-of-arrival estimation using a single fixed antenna, without the need for an array or antenna rotation. The method is demonstrated using a simple candelabra-shaped monopole operating in the 1-3 GHz range. A known transmitted pulse and high signal-to-noise ratio are needed, and the method is not as accurate or robust as conventional methods. However, it can add direction finding capability to a wideband communication system without additional hardware requirements.
{"title":"Direction finding using an antenna with direction dependent impulse response","authors":"H. Foltz, O. Kegege, S. Altunc","doi":"10.1109/APS.2016.7696635","DOIUrl":"https://doi.org/10.1109/APS.2016.7696635","url":null,"abstract":"Wideband antennas may be designed to have an impulse response that is direction dependent. This property can be used for angle-of-arrival estimation using a single fixed antenna, without the need for an array or antenna rotation. The method is demonstrated using a simple candelabra-shaped monopole operating in the 1-3 GHz range. A known transmitted pulse and high signal-to-noise ratio are needed, and the method is not as accurate or robust as conventional methods. However, it can add direction finding capability to a wideband communication system without additional hardware requirements.","PeriodicalId":6496,"journal":{"name":"2016 IEEE International Symposium on Antennas and Propagation (APSURSI)","volume":"68 1","pages":"1857-1858"},"PeriodicalIF":0.0,"publicationDate":"2016-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72797655","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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