Pub Date : 2018-09-01DOI: 10.1109/ICEAA.2018.8520533
R. Kastner, D. Weile
A balanced (Weston-type) absorber, characterized by both electric and magnetic loss mechanisms, can be placed within the null field inside the equivalent surface currents replacing a perfectly conducting or homogeneous scatterer. The absorber, referred to as the filler, substantially reduces interactions between pairs of opposing basis/testing functions. The resultant moment matrix, formulated with the filler Green's function, is thinned accordingly. Moreover, most annulled elements need not be computed at all, thereby reducing substantially the matrix fill time. The lossy nature of the Green's function also serves to eliminate spurious internal resonances and thus makes the electric or magnetic field integral equation matrix well conditioned without resorting to a combined field integral equation.
{"title":"Deep Thinning of MoM Matrices with the Balanced Electromagnetic Absorber Method in 3 Dimensions","authors":"R. Kastner, D. Weile","doi":"10.1109/ICEAA.2018.8520533","DOIUrl":"https://doi.org/10.1109/ICEAA.2018.8520533","url":null,"abstract":"A balanced (Weston-type) absorber, characterized by both electric and magnetic loss mechanisms, can be placed within the null field inside the equivalent surface currents replacing a perfectly conducting or homogeneous scatterer. The absorber, referred to as the filler, substantially reduces interactions between pairs of opposing basis/testing functions. The resultant moment matrix, formulated with the filler Green's function, is thinned accordingly. Moreover, most annulled elements need not be computed at all, thereby reducing substantially the matrix fill time. The lossy nature of the Green's function also serves to eliminate spurious internal resonances and thus makes the electric or magnetic field integral equation matrix well conditioned without resorting to a combined field integral equation.","PeriodicalId":219334,"journal":{"name":"2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130200669","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 : 2018-07-08DOI: 10.1109/APUSNCURSINRSM.2018.8608636
Shaowei Dai, Minghui Li, Q. Abbasi, M. Imran
This paper presents an improved adaptive beamforming solution based on Global Sidelobe Canceler (GSC) and Least Mean Square (LMS). By analyzing the impact of step size on LMS performance, a simple yet effective new Cyclic Variable Step Size (CVSS) algorithm is proposed to enhance the convergence speed and excess MSE performance of LMS. By adding just a few shift operations to adapt the step size cyclically, the CVSS LMS is efficient for hardware implementation. Initial study shows that it's possible to double the convergence speed with minimum overhead. The numerical simulation confirmed the effectiveness and performance of the algorithm.
{"title":"Hardware Efficient Adaptive Beamformer Based on Cyclic Variable Step Size","authors":"Shaowei Dai, Minghui Li, Q. Abbasi, M. Imran","doi":"10.1109/APUSNCURSINRSM.2018.8608636","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2018.8608636","url":null,"abstract":"This paper presents an improved adaptive beamforming solution based on Global Sidelobe Canceler (GSC) and Least Mean Square (LMS). By analyzing the impact of step size on LMS performance, a simple yet effective new Cyclic Variable Step Size (CVSS) algorithm is proposed to enhance the convergence speed and excess MSE performance of LMS. By adding just a few shift operations to adapt the step size cyclically, the CVSS LMS is efficient for hardware implementation. Initial study shows that it's possible to double the convergence speed with minimum overhead. The numerical simulation confirmed the effectiveness and performance of the algorithm.","PeriodicalId":219334,"journal":{"name":"2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115526975","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 : 2018-07-01DOI: 10.1109/APUSNCURSINRSM.2018.8609434
N. Peitzmeier, D. Manteuffel
A novel beamforming concept for small cells in 5G cellular systems at millimeter wave frequencies is proposed. Base station antenna arrays may be mounted on street lights or similar elevated structures to form small, densely deployed cells. In such a scenario, the power received by a mobile user within a cell depends on the scan angle due to varying directivity and propagation losses which has considerable impact on the base station efficiency. In order to overcome these issues, multi-beam antennas are employed as array elements. Depending on the scan angle, a suitable beam is selected and then steered towards the user. The multi-beam antennas are designed by means of the theory of characteristic modes. The basic feasibility of the proposed concept is demonstrated.
{"title":"Beamforming Concept for Multi-Beam Antennas Based on Characteristic Modes","authors":"N. Peitzmeier, D. Manteuffel","doi":"10.1109/APUSNCURSINRSM.2018.8609434","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2018.8609434","url":null,"abstract":"A novel beamforming concept for small cells in 5G cellular systems at millimeter wave frequencies is proposed. Base station antenna arrays may be mounted on street lights or similar elevated structures to form small, densely deployed cells. In such a scenario, the power received by a mobile user within a cell depends on the scan angle due to varying directivity and propagation losses which has considerable impact on the base station efficiency. In order to overcome these issues, multi-beam antennas are employed as array elements. Depending on the scan angle, a suitable beam is selected and then steered towards the user. The multi-beam antennas are designed by means of the theory of characteristic modes. The basic feasibility of the proposed concept is demonstrated.","PeriodicalId":219334,"journal":{"name":"2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115146874","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 : 2018-07-01DOI: 10.1109/APUSNCURSINRSM.2018.8609338
M. Odit, A. Sayanskiy, V. Asadchy, P. Belov
In this work we demonstrate the first design of the focusing reflecting all-dielectric metasurface which is realized on periodically arranged bianisotropic elements made of distilled water. The metasurface was shown to demonstrate focusing capabilities of the reflected electromagnetic signal at 12 GHz while preserving transparency outside of the operating frequency band.
{"title":"Microwave reflecting focusing metasurface based on water","authors":"M. Odit, A. Sayanskiy, V. Asadchy, P. Belov","doi":"10.1109/APUSNCURSINRSM.2018.8609338","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2018.8609338","url":null,"abstract":"In this work we demonstrate the first design of the focusing reflecting all-dielectric metasurface which is realized on periodically arranged bianisotropic elements made of distilled water. The metasurface was shown to demonstrate focusing capabilities of the reflected electromagnetic signal at 12 GHz while preserving transparency outside of the operating frequency band.","PeriodicalId":219334,"journal":{"name":"2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123105052","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 : 2018-07-01DOI: 10.1109/APUSNCURSINRSM.2018.8608906
A. Okba, A. Takacs, H. Aubert
This paper addresses the design and the characterization of a compact (2.3 cm x 3.4 cm) flat dipole antenna surrounded by a rectangular ring. Due to its wide frequency bandwidth, this antenna covers the UMTS, LTE 4G, WiFi and WiMAX (IEEE 802.16e) bands and can be advantageously used for RF Energy Harvesting or Wireless Power Transmission applications. A compact rectenna using the proposed antenna was manufactured and characterized. It allows reaching a RF -DC conversion efficiency of 38.6% for an E-field of 7V/m with a 1.5 kΩ load.
本文介绍了一种由矩形环包围的紧凑(2.3 cm x 3.4 cm)平面偶极子天线的设计和特性。由于其宽的频率带宽，该天线涵盖了UMTS, LTE 4G, WiFi和WiMAX (IEEE 802.16e)频段，可以有利地用于射频能量收集或无线电力传输应用。利用所提出的天线制造了一个紧凑的整流天线并对其进行了表征。它允许在7V/m的e场和1.5 kΩ负载下达到38.6%的RF -DC转换效率。
{"title":"Compact Flat Dipole Rectenna for Energy Harvesting or Wireless Power Transmission Applications","authors":"A. Okba, A. Takacs, H. Aubert","doi":"10.1109/APUSNCURSINRSM.2018.8608906","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2018.8608906","url":null,"abstract":"This paper addresses the design and the characterization of a compact (2.3 cm x 3.4 cm) flat dipole antenna surrounded by a rectangular ring. Due to its wide frequency bandwidth, this antenna covers the UMTS, LTE 4G, WiFi and WiMAX (IEEE 802.16e) bands and can be advantageously used for RF Energy Harvesting or Wireless Power Transmission applications. A compact rectenna using the proposed antenna was manufactured and characterized. It allows reaching a RF -DC conversion efficiency of 38.6% for an E-field of 7V/m with a 1.5 kΩ load.","PeriodicalId":219334,"journal":{"name":"2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115768510","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 : 2018-07-01DOI: 10.1109/APUSNCURSINRSM.2018.8609106
Quinten Van den Brande, S. Lemey, H. Rogier, J. Vanfleteren
A coupled half-mode cavity-backed slot antenna for high-precision impulse-radio ultra-wideband (IR-UWB) localization applications in the [3.7740; 4.7424] GHz frequency band of the IEEE 802.15.4a-2011 standard is designed and implemented in air-filled substrate-integrated-waveguide (AFSIW) technology. The antenna is matched to 50Ω in the [3.6400; 4.8300] GHz frequency band, yielding a bandwidth of 1.19 GHz or 28.1%. Furthermore, a total antenna efficiency higher than 91.0% and a system fidelity factor (SFF) higher than 98% is achieved within the 3dB-beamwidth of the antenna, making it suitable for high-precision IR-UWB localization.
{"title":"Coupled Half-Mode Cavity-Backed Slot Antenna for IR-UWB in Air-Filled SIW Technology","authors":"Quinten Van den Brande, S. Lemey, H. Rogier, J. Vanfleteren","doi":"10.1109/APUSNCURSINRSM.2018.8609106","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2018.8609106","url":null,"abstract":"A coupled half-mode cavity-backed slot antenna for high-precision impulse-radio ultra-wideband (IR-UWB) localization applications in the [3.7740; 4.7424] GHz frequency band of the IEEE 802.15.4a-2011 standard is designed and implemented in air-filled substrate-integrated-waveguide (AFSIW) technology. The antenna is matched to 50Ω in the [3.6400; 4.8300] GHz frequency band, yielding a bandwidth of 1.19 GHz or 28.1%. Furthermore, a total antenna efficiency higher than 91.0% and a system fidelity factor (SFF) higher than 98% is achieved within the 3dB-beamwidth of the antenna, making it suitable for high-precision IR-UWB localization.","PeriodicalId":219334,"journal":{"name":"2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116957838","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 : 2018-07-01DOI: 10.1109/APUSNCURSINRSM.2018.8609025
Mohammad Alhassoun, Michael A. Varner, G. Durgin
This paper presents a new technique for suppressing specular reflection using binary reflective surfaces (such as those easily fabricated on a printed circuit board)that maximally suppress mean currents on the reflector using the theory of perfect pulses. We simulate multiple versions (or orders)of these structures to characterize the nulling depth and manufacturing tolerance of the designs. In addition, we run another set of simulations to characterize the specular reflection as a function of the direction of incidence. The simulation reveals that the specular reflection from the proposed structures is at least 9.3 dB less than that from a flat metal plate of the same dimensions.
{"title":"Low-Observable Reflectors Using Perfect Pulses","authors":"Mohammad Alhassoun, Michael A. Varner, G. Durgin","doi":"10.1109/APUSNCURSINRSM.2018.8609025","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2018.8609025","url":null,"abstract":"This paper presents a new technique for suppressing specular reflection using binary reflective surfaces (such as those easily fabricated on a printed circuit board)that maximally suppress mean currents on the reflector using the theory of perfect pulses. We simulate multiple versions (or orders)of these structures to characterize the nulling depth and manufacturing tolerance of the designs. In addition, we run another set of simulations to characterize the specular reflection as a function of the direction of incidence. The simulation reveals that the specular reflection from the proposed structures is at least 9.3 dB less than that from a flat metal plate of the same dimensions.","PeriodicalId":219334,"journal":{"name":"2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116995769","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 : 2018-07-01DOI: 10.1109/APUSNCURSINRSM.2018.8609254
D. F. Mona, D. Nascimento
In this work, through the cavity model, the universe of achievable input impedances generated by the probe-fed circularly polarized rectangular microstrip antenna is investigated. Results of the analysis at the frequency of operation are displayed on an easy to use graphic. To prove the concept, an antenna was designed with an input impedance located in the predicted universe.
{"title":"Available Universe of Input Impedances for the Probe-Fed Circularly Polarized Microstrip Antenna","authors":"D. F. Mona, D. Nascimento","doi":"10.1109/APUSNCURSINRSM.2018.8609254","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2018.8609254","url":null,"abstract":"In this work, through the cavity model, the universe of achievable input impedances generated by the probe-fed circularly polarized rectangular microstrip antenna is investigated. Results of the analysis at the frequency of operation are displayed on an easy to use graphic. To prove the concept, an antenna was designed with an input impedance located in the predicted universe.","PeriodicalId":219334,"journal":{"name":"2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117163954","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 : 2018-07-01DOI: 10.1109/APUSNCURSINRSM.2018.8608390
Maxime Y. Monin, Lyes Rahmouni, F. Andriulli
The boundary element method provides a computationally efficient solution to the Electroencephalography (EEG) forward problem on piece-wise homogeneous head models by using surface integral equations. However, realistic modeling of the head medium requires a proper account of the anisotropic electric nature of the human skull, which cannot be handled by standard surface integral equations. This work addresses this issue by presenting a new formulation which perturbs the standard Lippmann-Schwinger approach with volume elements within the skull. The resulting surface/volume integral equation can handle computations of fully realistic modeling for both skull and white matter. Numerical results will confirm the validity of the approach as well as its applicability to real case scenarios.
{"title":"A Hybrid Integral Equation Approach to Solve the Anisotropic Forward Problem in Electroencephalography","authors":"Maxime Y. Monin, Lyes Rahmouni, F. Andriulli","doi":"10.1109/APUSNCURSINRSM.2018.8608390","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2018.8608390","url":null,"abstract":"The boundary element method provides a computationally efficient solution to the Electroencephalography (EEG) forward problem on piece-wise homogeneous head models by using surface integral equations. However, realistic modeling of the head medium requires a proper account of the anisotropic electric nature of the human skull, which cannot be handled by standard surface integral equations. This work addresses this issue by presenting a new formulation which perturbs the standard Lippmann-Schwinger approach with volume elements within the skull. The resulting surface/volume integral equation can handle computations of fully realistic modeling for both skull and white matter. Numerical results will confirm the validity of the approach as well as its applicability to real case scenarios.","PeriodicalId":219334,"journal":{"name":"2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"15 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120862687","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 : 2018-07-01DOI: 10.1109/APUSNCURSINRSM.2018.8608557
Khalid A. Almegbel, S. Saeed, H. Shaman, C. Balanis, W. Alomar
In this paper, we propose a novel I-shaped folded slot antenna that miniaturizes the overall size (40% reduction) of a conventional folded slot antenna designed at 1.4 GHz. The antenna is designed and simulated using HFSS on a flexible thin substrate so it can be used for conformal applications. It is also reconfigurable and two p-i-n diodes are used to redirect and redistribute the current resulting in a frequency reconfigurable antenna. When the diodes are ON, the I -shaped folded slot antenna behaves as conventional folded slot antenna at 3 GHz. However, when the diodes are OFF, the current is redirected on the entire I -shaped slot and it is resonating at a lower frequency 1.4 GHz.
{"title":"Flexible Reconfigurable I-shaped Folded Slot Antenna for Wireless Devices","authors":"Khalid A. Almegbel, S. Saeed, H. Shaman, C. Balanis, W. Alomar","doi":"10.1109/APUSNCURSINRSM.2018.8608557","DOIUrl":"https://doi.org/10.1109/APUSNCURSINRSM.2018.8608557","url":null,"abstract":"In this paper, we propose a novel I-shaped folded slot antenna that miniaturizes the overall size (40% reduction) of a conventional folded slot antenna designed at 1.4 GHz. The antenna is designed and simulated using HFSS on a flexible thin substrate so it can be used for conformal applications. It is also reconfigurable and two p-i-n diodes are used to redirect and redistribute the current resulting in a frequency reconfigurable antenna. When the diodes are ON, the I -shaped folded slot antenna behaves as conventional folded slot antenna at 3 GHz. However, when the diodes are OFF, the current is redirected on the entire I -shaped slot and it is resonating at a lower frequency 1.4 GHz.","PeriodicalId":219334,"journal":{"name":"2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting","volume":"544 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120864818","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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