Pub Date : 1900-01-01DOI: 10.1109/IWAT.2017.7915334
M. W. A. Khan, L. Sydänheimo, T. Björninen, L. Ukkonen
This paper presents the pressure readout results from a piezoresistive pressure sensor in a biological environment mimicking the human head properties for intracranial pressure (ICP) monitoring application. The piezoresistive pressure sensor is powered wirelessly through inductively coupled antennas. After successful activation of the sensor, the pressure readout is demonstrated from 0 mmHg to 30 mmHg with a resolution of one mmHg.
{"title":"Wirelessly powered implantable system for wireless long-term monitoring of intracranial pressure","authors":"M. W. A. Khan, L. Sydänheimo, T. Björninen, L. Ukkonen","doi":"10.1109/IWAT.2017.7915334","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915334","url":null,"abstract":"This paper presents the pressure readout results from a piezoresistive pressure sensor in a biological environment mimicking the human head properties for intracranial pressure (ICP) monitoring application. The piezoresistive pressure sensor is powered wirelessly through inductively coupled antennas. After successful activation of the sensor, the pressure readout is demonstrated from 0 mmHg to 30 mmHg with a resolution of one mmHg.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115822660","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 : 1900-01-01DOI: 10.1109/IWAT.2017.7915337
Z. Hao, Jun Hu, W. Hong
In this paper, a wideband linear polarization (LP) stacked patch antenna with two switchable feeding ports is proposed. Individual excitation at the two diagonal ports can produce a 180-degree phase-shifting due to the symmetrical structure. Then, a polarization reconfigurable antenna array based on the proposed LP antenna is developed, which can radiate vertical-LP (V-LP), horizontal-LP (H-LP), left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP) waves by properly selecting the feeding ports.
{"title":"A wideband stacked patch antenna for reconfigurable polarization applications","authors":"Z. Hao, Jun Hu, W. Hong","doi":"10.1109/IWAT.2017.7915337","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915337","url":null,"abstract":"In this paper, a wideband linear polarization (LP) stacked patch antenna with two switchable feeding ports is proposed. Individual excitation at the two diagonal ports can produce a 180-degree phase-shifting due to the symmetrical structure. Then, a polarization reconfigurable antenna array based on the proposed LP antenna is developed, which can radiate vertical-LP (V-LP), horizontal-LP (H-LP), left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP) waves by properly selecting the feeding ports.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"189 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124188999","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 : 1900-01-01DOI: 10.1109/IWAT.2017.7915338
Y. Liu, Hu Liu, S. Gong
A wideband horizontally polarized (HP) omnidirectional antenna is presented. The tightly coupled array (TCA) mechanism is ultilized into the design of the antenna to realize reduced lower cut-off frequency and improved bandwidth. The −10dB impedance bandwidth is 102.6% from 4.8GHz to 14.7GHz. Meanwhile, uniform omnidirectional radiation patterns with a gain variation of less than 3dB are obtained within the frequency band of 4.7–8GHz (51.96%).
{"title":"A wideband horizontally polarized omnidirectional antenna using tightly coupled array mechanism","authors":"Y. Liu, Hu Liu, S. Gong","doi":"10.1109/IWAT.2017.7915338","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915338","url":null,"abstract":"A wideband horizontally polarized (HP) omnidirectional antenna is presented. The tightly coupled array (TCA) mechanism is ultilized into the design of the antenna to realize reduced lower cut-off frequency and improved bandwidth. The −10dB impedance bandwidth is 102.6% from 4.8GHz to 14.7GHz. Meanwhile, uniform omnidirectional radiation patterns with a gain variation of less than 3dB are obtained within the frequency band of 4.7–8GHz (51.96%).","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"205 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131882022","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 : 1900-01-01DOI: 10.1109/IWAT.2017.7915335
Huiteng Zhong, Xue-xia Yang
A novel metamaterial surface with polarization-insensitive and wide-angle operating in a broadband is presented. The metamaterial cell consists of four same e-shaped Split-Ring Resonators (SRRs) arranged in rotating central symmetry. The structure is analyzed and optimized by using CST software. The harvesting efficiencies on the normal and oblique incidences, energy distribution and the S parameters are also investigated. The simulation results show that the maximum harvesting efficiency is 92% at 5.4 GHz with the HPBW (Half Power Beam Width) of 54% (4.7GHz–8.2GHz) for the random polarizations under the normal incidence. On the oblique incidence of 60°, the maximum efficiency is 98.2% and 57.6% for TM and TE modes, respectively. The meta-surface has been fabricated and measured to verify the effectiveness of the broadband, polarization-insensitive and wide-angle energy harvester.
{"title":"Broadband meta-surface with polarization-insensitive and wide-angle for electromagnetic energy harvesting","authors":"Huiteng Zhong, Xue-xia Yang","doi":"10.1109/IWAT.2017.7915335","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915335","url":null,"abstract":"A novel metamaterial surface with polarization-insensitive and wide-angle operating in a broadband is presented. The metamaterial cell consists of four same e-shaped Split-Ring Resonators (SRRs) arranged in rotating central symmetry. The structure is analyzed and optimized by using CST software. The harvesting efficiencies on the normal and oblique incidences, energy distribution and the S parameters are also investigated. The simulation results show that the maximum harvesting efficiency is 92% at 5.4 GHz with the HPBW (Half Power Beam Width) of 54% (4.7GHz–8.2GHz) for the random polarizations under the normal incidence. On the oblique incidence of 60°, the maximum efficiency is 98.2% and 57.6% for TM and TE modes, respectively. The meta-surface has been fabricated and measured to verify the effectiveness of the broadband, polarization-insensitive and wide-angle energy harvester.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129613193","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 : 1900-01-01DOI: 10.1109/IWAT.2017.7915371
M. Antoniades, S. A. Rezaeieh, A. Abbosh
Compact, wideband and unidirectional loop antennas are presented, that are based on a conventional planar loop antenna that is loaded in a mu-negative (MNG) fashion with series capacitors, enabling a mu-zero (MZR) resonance to be excited. This, together with the inherent loop resonance and a third resonance introduced by a director element, result in a wide impedance bandwidth and enhanced directivity. Two variants of the MNG-loaded loop antenna are presented; one with a uniform distribution of the MNG-unit cells, and one with a non-uniform distribution. It is shown that both antennas, which have a compact size, achieve a wide operating bandwidth in excess of 50% in the range of 0.6 to 1.1 GHz in the lower UHF band. The uniformly loaded antenna has a measured gain of 3.2 dBi, while the non-uniformly loaded antenna has a higher measured gain of 4.8 dBi. Both antennas have high front-to-back ratios in the range of 10 dB throughout the operating band.
{"title":"Bandwidth and directivity enhancement of metamaterial-loaded loop antennas for microwave imaging applications","authors":"M. Antoniades, S. A. Rezaeieh, A. Abbosh","doi":"10.1109/IWAT.2017.7915371","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915371","url":null,"abstract":"Compact, wideband and unidirectional loop antennas are presented, that are based on a conventional planar loop antenna that is loaded in a mu-negative (MNG) fashion with series capacitors, enabling a mu-zero (MZR) resonance to be excited. This, together with the inherent loop resonance and a third resonance introduced by a director element, result in a wide impedance bandwidth and enhanced directivity. Two variants of the MNG-loaded loop antenna are presented; one with a uniform distribution of the MNG-unit cells, and one with a non-uniform distribution. It is shown that both antennas, which have a compact size, achieve a wide operating bandwidth in excess of 50% in the range of 0.6 to 1.1 GHz in the lower UHF band. The uniformly loaded antenna has a measured gain of 3.2 dBi, while the non-uniformly loaded antenna has a higher measured gain of 4.8 dBi. Both antennas have high front-to-back ratios in the range of 10 dB throughout the operating band.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132590443","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 : 1900-01-01DOI: 10.1109/IWAT.2017.7915347
G. Bellizzi, L. Crocco, D. Iero, T. Isernia
The capability of controlling the spatial distribution of a field into a given scenario is relevant to many applications as different as hyperthermia treatment planning and wireless network optimization. In this respect, many strategies to focus the field into a target point have been presented, whereas the possibility of arbitrarily shaping a field still remains an open challenge. In this communication, we present an innovative approach to field intensity shaping that unravels the original NP hard problem into several convex programming ones, by means of the proper equality constrained method. The approach is discussed and assessed with a numerical example.
{"title":"Arbitrary field intensity shaping via multi-target optimal constrained power focusing","authors":"G. Bellizzi, L. Crocco, D. Iero, T. Isernia","doi":"10.1109/IWAT.2017.7915347","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915347","url":null,"abstract":"The capability of controlling the spatial distribution of a field into a given scenario is relevant to many applications as different as hyperthermia treatment planning and wireless network optimization. In this respect, many strategies to focus the field into a target point have been presented, whereas the possibility of arbitrarily shaping a field still remains an open challenge. In this communication, we present an innovative approach to field intensity shaping that unravels the original NP hard problem into several convex programming ones, by means of the proper equality constrained method. The approach is discussed and assessed with a numerical example.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133249471","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 : 1900-01-01DOI: 10.1109/IWAT.2017.7915339
Q. Chu, D. Zheng, Rui Wu
In this paper, two miniaturized base-station antenna elements working in the high- and low-frequency bands respectively are proposed firstly. Then, several kinds of subarray arrangements and decoupling techniques are demonstrated explicitly. Finally, three types of multi-array multi-band antennas with good performances are presented to meet the practical base-station applications.
{"title":"Multi-array multi-band base-station antennas","authors":"Q. Chu, D. Zheng, Rui Wu","doi":"10.1109/IWAT.2017.7915339","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915339","url":null,"abstract":"In this paper, two miniaturized base-station antenna elements working in the high- and low-frequency bands respectively are proposed firstly. Then, several kinds of subarray arrangements and decoupling techniques are demonstrated explicitly. Finally, three types of multi-array multi-band antennas with good performances are presented to meet the practical base-station applications.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124995037","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 : 1900-01-01DOI: 10.1109/IWAT.2017.7915392
Reona Sugiyama, Quang-Thang Duong, M. Okada
This paper investigates maximum achievable efficiency of inductive power transfer (IPT) system with arbitrary number of receivers. We derive the formulas of optimal loads and maximum efficiency based on N-port network model. Via analysis and computer simulations, we show that the cross-coupling among receivers does not affect system efficiency if load resistances and reactances are jointly optimized. We also prove that the maximum efficiency is dominated by a so-called system kQ-product, whose square is interestingly, equal to the sum of squares of kQ-products of individual transmitter-receiver links.
{"title":"kQ-product analysis of multiple-receiver inductive power transfer with cross-coupling","authors":"Reona Sugiyama, Quang-Thang Duong, M. Okada","doi":"10.1109/IWAT.2017.7915392","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915392","url":null,"abstract":"This paper investigates maximum achievable efficiency of inductive power transfer (IPT) system with arbitrary number of receivers. We derive the formulas of optimal loads and maximum efficiency based on N-port network model. Via analysis and computer simulations, we show that the cross-coupling among receivers does not affect system efficiency if load resistances and reactances are jointly optimized. We also prove that the maximum efficiency is dominated by a so-called system kQ-product, whose square is interestingly, equal to the sum of squares of kQ-products of individual transmitter-receiver links.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"127 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124215087","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 : 1900-01-01DOI: 10.1109/IWAT.2017.7915386
A. L. Torla, S. Khamas
The Near-Field Intensity Enhancement (NFIE) of a Distributed Bragg Reflector has been calculated at the presence of a constructive interference at the surface of a Bragg reflector. The Bragg reflector has been constructed using SiO2/GaAs with respective refractive indices of n1=1.5 and n2=3.6. A reflectivity of 0.99986 has been simulated with an electric field enhancement approaching 2. The Bragg reflector is coupled with a Gold dipole nanoantenna to obtain a significant NFIE that is 14 times stronger than that of a Gold dipole nanoantenna above a pure silica (SiO2) surface. This significant increase is shown to be the result of the coupling effect between the Gold dipole and its mirror image.
{"title":"Near-Field Intensity Enhancement of a nano-antenna above an inverted Bragg Reflector","authors":"A. L. Torla, S. Khamas","doi":"10.1109/IWAT.2017.7915386","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915386","url":null,"abstract":"The Near-Field Intensity Enhancement (NFIE) of a Distributed Bragg Reflector has been calculated at the presence of a constructive interference at the surface of a Bragg reflector. The Bragg reflector has been constructed using SiO2/GaAs with respective refractive indices of n1=1.5 and n2=3.6. A reflectivity of 0.99986 has been simulated with an electric field enhancement approaching 2. The Bragg reflector is coupled with a Gold dipole nanoantenna to obtain a significant NFIE that is 14 times stronger than that of a Gold dipole nanoantenna above a pure silica (SiO2) surface. This significant increase is shown to be the result of the coupling effect between the Gold dipole and its mirror image.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127300258","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 : 1900-01-01DOI: 10.1109/IWAT.2017.7915376
Li Cui, Ke Chen, Yijun Feng
We proposed an anisotropic metasurface performing different scattering properties depending on the polarization of the incident electromagnetic wave. The proposed metasurface is composed of orthogonally I-shaped structures with a thickness of only 0.067 working wavelength, and the reflection phase for certain linearly polarized incidence can be independently controlled by tuning the corresponding geometric parameters. Based on this principle we designed a bi-functional metasurface for differently polarized wave. It can behave as a phase-compensation planar reflector to transform the primary out-phase radiation from an x-polarized feeding antenna into a secondary planar wavefront with high directivity reaching 22 dBi. On the other hand, it behaves as a diffuse reflector composed of randomly distributed reflection phases to suppress the backward radar cross section in a broad band (8.2 GHz–12.5 GHz) under the illumination of y-polarized incident wave.
{"title":"Bi-functional metasurface controlling electromagnetic wave scattering of differently polarized wave","authors":"Li Cui, Ke Chen, Yijun Feng","doi":"10.1109/IWAT.2017.7915376","DOIUrl":"https://doi.org/10.1109/IWAT.2017.7915376","url":null,"abstract":"We proposed an anisotropic metasurface performing different scattering properties depending on the polarization of the incident electromagnetic wave. The proposed metasurface is composed of orthogonally I-shaped structures with a thickness of only 0.067 working wavelength, and the reflection phase for certain linearly polarized incidence can be independently controlled by tuning the corresponding geometric parameters. Based on this principle we designed a bi-functional metasurface for differently polarized wave. It can behave as a phase-compensation planar reflector to transform the primary out-phase radiation from an x-polarized feeding antenna into a secondary planar wavefront with high directivity reaching 22 dBi. On the other hand, it behaves as a diffuse reflector composed of randomly distributed reflection phases to suppress the backward radar cross section in a broad band (8.2 GHz–12.5 GHz) under the illumination of y-polarized incident wave.","PeriodicalId":289886,"journal":{"name":"2017 International Workshop on Antenna Technology: Small Antennas, Innovative Structures, and Applications (iWAT)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114204657","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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