Pub Date : 2013-03-04DOI: 10.1109/IWAT.2013.6518334
D. K. Das, M. Ahmed, A. Rahman
Antennas, when used in devices having non-planar surface, essentially require a distinctive design approach from the rest of the applications. In this paper, a planar self-complimentary circular disk Ultra Wideband (UWB) antenna is conformed into non-planar cylindrical structures of different radius of curvature so that it can used in devices consisting non-planar surface. The design procedure is derived from the basic circular disk antenna. From the simulations, characterizing parameters of antennas have been studied for different bent angles.
{"title":"Study of conformal self-complimentary dipole antenna designed on various non-planar surfaces","authors":"D. K. Das, M. Ahmed, A. Rahman","doi":"10.1109/IWAT.2013.6518334","DOIUrl":"https://doi.org/10.1109/IWAT.2013.6518334","url":null,"abstract":"Antennas, when used in devices having non-planar surface, essentially require a distinctive design approach from the rest of the applications. In this paper, a planar self-complimentary circular disk Ultra Wideband (UWB) antenna is conformed into non-planar cylindrical structures of different radius of curvature so that it can used in devices consisting non-planar surface. The design procedure is derived from the basic circular disk antenna. From the simulations, characterizing parameters of antennas have been studied for different bent angles.","PeriodicalId":247542,"journal":{"name":"2013 International Workshop on Antenna Technology (iWAT)","volume":"32 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134519998","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 : 2013-03-04DOI: 10.1109/IWAT.2013.6518344
N. Haga, K. Motojima
The physical channels establishing intrabody communications were first treated as capacitive circuits by Zimmerman. However, their validity had been unclear for a long time. For this reason, one of the authors has derived an improved circuit model by solving a boundary value problem of electric potentials of conductors. Although the signal transmission mechanism of the intrabody communications can be described by the improved circuit model, the most important problem to be overcome is to protect against the noise. In the present paper, noise sources in equivalent circuits of the intrabody communication channels are derived based on the theory of electrostatic field, and how to reduce the received noise voltage is discussed.
{"title":"Noise sources in equivalent circuits of intrabody communication channels","authors":"N. Haga, K. Motojima","doi":"10.1109/IWAT.2013.6518344","DOIUrl":"https://doi.org/10.1109/IWAT.2013.6518344","url":null,"abstract":"The physical channels establishing intrabody communications were first treated as capacitive circuits by Zimmerman. However, their validity had been unclear for a long time. For this reason, one of the authors has derived an improved circuit model by solving a boundary value problem of electric potentials of conductors. Although the signal transmission mechanism of the intrabody communications can be described by the improved circuit model, the most important problem to be overcome is to protect against the noise. In the present paper, noise sources in equivalent circuits of the intrabody communication channels are derived based on the theory of electrostatic field, and how to reduce the received noise voltage is discussed.","PeriodicalId":247542,"journal":{"name":"2013 International Workshop on Antenna Technology (iWAT)","volume":"133 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131466049","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 : 2013-03-04DOI: 10.1109/IWAT.2013.6518361
J. Wang, E. Lim, Zhao Wang, Yi Huang, T. Tillo, Meng Zhang, R. Alrawashdeh
Wireless capsule endoscopy (WCE) has conquered some limitations of traditional diagnosing tools, such as the comfortlessness of the cables and the inability of examining small intestine section. However, this technique is still far from satisfactory and requires some feasible improvements. Antennas play a major role in achieving these improvements and in building up the communication link between the capsule and the external receiver. Therefore, the design of a WCE transmitter antenna has been investigated in this paper. Two planar antennas are proposed and optimized in this paper. These two planar antennas have an ultrawide bandwidth, omnidirectional radiation pattern and deep return loss, which can meet the requirements for WCE system.
{"title":"UWB planar antennas for wireless capsule endoscopy","authors":"J. Wang, E. Lim, Zhao Wang, Yi Huang, T. Tillo, Meng Zhang, R. Alrawashdeh","doi":"10.1109/IWAT.2013.6518361","DOIUrl":"https://doi.org/10.1109/IWAT.2013.6518361","url":null,"abstract":"Wireless capsule endoscopy (WCE) has conquered some limitations of traditional diagnosing tools, such as the comfortlessness of the cables and the inability of examining small intestine section. However, this technique is still far from satisfactory and requires some feasible improvements. Antennas play a major role in achieving these improvements and in building up the communication link between the capsule and the external receiver. Therefore, the design of a WCE transmitter antenna has been investigated in this paper. Two planar antennas are proposed and optimized in this paper. These two planar antennas have an ultrawide bandwidth, omnidirectional radiation pattern and deep return loss, which can meet the requirements for WCE system.","PeriodicalId":247542,"journal":{"name":"2013 International Workshop on Antenna Technology (iWAT)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127855160","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 : 2013-03-04DOI: 10.1109/IWAT.2013.6518366
B. Derat, L. Aberbour, K. Quéléver, T. Julien, M. Dembiński, S. Pannetrat, A. Cozza
Standard Specific Absorption Rate (SAR) measurement methods are highly time consuming. Compliance test lead times for mobile wireless devices are incompatible with current needs in the industry and become a growing pain with the emergence of 4G communications. This paper introduces a new technology designed for solving this problem and providing instantaneous and accurate peak spatial-average SAR evaluation.
{"title":"A novel technology for fast and accurate specific absorption rate measurement","authors":"B. Derat, L. Aberbour, K. Quéléver, T. Julien, M. Dembiński, S. Pannetrat, A. Cozza","doi":"10.1109/IWAT.2013.6518366","DOIUrl":"https://doi.org/10.1109/IWAT.2013.6518366","url":null,"abstract":"Standard Specific Absorption Rate (SAR) measurement methods are highly time consuming. Compliance test lead times for mobile wireless devices are incompatible with current needs in the industry and become a growing pain with the emergence of 4G communications. This paper introduces a new technology designed for solving this problem and providing instantaneous and accurate peak spatial-average SAR evaluation.","PeriodicalId":247542,"journal":{"name":"2013 International Workshop on Antenna Technology (iWAT)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122189258","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 : 2013-03-04DOI: 10.1109/IWAT.2013.6518345
R. Hahnel, Qiong Wang, R. Trieb, D. Plettemeier, A. Henning
A single patch antenna design operating in 868 MHz band is presented in this paper which is integrated in the mat for the human heartbeat detection for triggering pruposes of medical devices. To broaden the operating bandwidth so that the inadaptability from different patients can be declined, a U shape is slotted on the radiation patch and moreover a thick substrate is utilized. Feeding network is designed on the opposite layer of the radiation patch to reduce the influence on the matching from the human body. Besides, a favorable thin copper cladding prototype is also manufactured since thick metal influences significantly the results of several medical imaging techniques, e.g. angiography or computed tomography (CT). Antenna prototypes are measured on human body with different separation distance and the resulting shortening effects are discussed.
{"title":"Antenna design for heartbeat detection for triggering purposes of medical devices","authors":"R. Hahnel, Qiong Wang, R. Trieb, D. Plettemeier, A. Henning","doi":"10.1109/IWAT.2013.6518345","DOIUrl":"https://doi.org/10.1109/IWAT.2013.6518345","url":null,"abstract":"A single patch antenna design operating in 868 MHz band is presented in this paper which is integrated in the mat for the human heartbeat detection for triggering pruposes of medical devices. To broaden the operating bandwidth so that the inadaptability from different patients can be declined, a U shape is slotted on the radiation patch and moreover a thick substrate is utilized. Feeding network is designed on the opposite layer of the radiation patch to reduce the influence on the matching from the human body. Besides, a favorable thin copper cladding prototype is also manufactured since thick metal influences significantly the results of several medical imaging techniques, e.g. angiography or computed tomography (CT). Antenna prototypes are measured on human body with different separation distance and the resulting shortening effects are discussed.","PeriodicalId":247542,"journal":{"name":"2013 International Workshop on Antenna Technology (iWAT)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130971819","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 : 2013-03-04DOI: 10.1109/IWAT.2013.6518365
A. B. Smolders, A. Reniers, U. Johannsen, M. Herben
The effect of amplitude and phase errors on the radiation properties of phased array can be reduced by using a proper calibration scheme. Based on a brief review of microwave phased-arrays we derived the key requirements for a new anechoic millimeter-wave (mm-wave) antenna set-up which was constructed. The residual measurement errors obtained with this new set-up are low enough for the calibration of low-sidelobe mm-wave phased arrays.
{"title":"Measurement and calibration challenges of microwave and millimeter-wave phased-arrays","authors":"A. B. Smolders, A. Reniers, U. Johannsen, M. Herben","doi":"10.1109/IWAT.2013.6518365","DOIUrl":"https://doi.org/10.1109/IWAT.2013.6518365","url":null,"abstract":"The effect of amplitude and phase errors on the radiation properties of phased array can be reduced by using a proper calibration scheme. Based on a brief review of microwave phased-arrays we derived the key requirements for a new anechoic millimeter-wave (mm-wave) antenna set-up which was constructed. The residual measurement errors obtained with this new set-up are low enough for the calibration of low-sidelobe mm-wave phased arrays.","PeriodicalId":247542,"journal":{"name":"2013 International Workshop on Antenna Technology (iWAT)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132381444","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 : 2013-03-04DOI: 10.1109/IWAT.2013.6518349
H. M. Mousa, M. Shabat
The propagation characteristics of TE waves in a cylindrical waveguide structure of a lateral antiferromagnetic -non magnetic superlattices (LANs) bounded by a left handed material (LHM) are investigated. We found that, adjusting the thickness of the waveguide to small reduced radius will support backward TE wave modes which can have very large effective index nx. At large reduced radius the forward waves of definite wave index and lower frequency are observed. Larger propagation lengths and constant power of the backward waves are realized by decreasing the values of negative electric permittivity εh of LHm. By decreasing the magnetic fraction f1 of (LANS), the backward waves hare getting higher power.
{"title":"TE waves in a cylindrical superlattices (LANs) and left handed material (LHm) waveguide structure","authors":"H. M. Mousa, M. Shabat","doi":"10.1109/IWAT.2013.6518349","DOIUrl":"https://doi.org/10.1109/IWAT.2013.6518349","url":null,"abstract":"The propagation characteristics of TE waves in a cylindrical waveguide structure of a lateral antiferromagnetic -non magnetic superlattices (LANs) bounded by a left handed material (LHM) are investigated. We found that, adjusting the thickness of the waveguide to small reduced radius will support backward TE wave modes which can have very large effective index nx. At large reduced radius the forward waves of definite wave index and lower frequency are observed. Larger propagation lengths and constant power of the backward waves are realized by decreasing the values of negative electric permittivity εh of LHm. By decreasing the magnetic fraction f1 of (LANS), the backward waves hare getting higher power.","PeriodicalId":247542,"journal":{"name":"2013 International Workshop on Antenna Technology (iWAT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128756040","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 : 2013-03-04DOI: 10.1109/IWAT.2013.6518368
K. Ito, Chia-Hsien Lin
Body-Centric Wireless Communications (BCWCs) using wearable wireless devices have received an increasing amount of attention due to many applications such as medical care system, identification system and entertainment. In this review paper, we introduce a low-profile dual-mode (on- / off- body modes) wearable antenna for medical applications. In on-body mode, the proposed antenna is similar to a pair of metal electrodes operating at 10MHz and in off-body mode, with an L-shaped slit embedded, the antenna can cover the 2.45 GHz ISM band. Some simulated and measured results are shown to verify the proposed antenna.
{"title":"Dual-mode wearable antenna for medical applications","authors":"K. Ito, Chia-Hsien Lin","doi":"10.1109/IWAT.2013.6518368","DOIUrl":"https://doi.org/10.1109/IWAT.2013.6518368","url":null,"abstract":"Body-Centric Wireless Communications (BCWCs) using wearable wireless devices have received an increasing amount of attention due to many applications such as medical care system, identification system and entertainment. In this review paper, we introduce a low-profile dual-mode (on- / off- body modes) wearable antenna for medical applications. In on-body mode, the proposed antenna is similar to a pair of metal electrodes operating at 10MHz and in off-body mode, with an L-shaped slit embedded, the antenna can cover the 2.45 GHz ISM band. Some simulated and measured results are shown to verify the proposed antenna.","PeriodicalId":247542,"journal":{"name":"2013 International Workshop on Antenna Technology (iWAT)","volume":"141 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117169453","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 : 2013-03-04DOI: 10.1109/IWAT.2013.6518350
Y. Aizu, N. Michishita, Y. Yamada, K. Cho
In multi-band base station antennas, interference toward neighboring cells at low operating frequency increases since tilting angle is frequency-independent and beamwidth in the vertical plane increases as decreasing the operating frequency. This paper presents a new low-profile phase shifter which comprises non-linear frequency-dependent characteristics. The proposed phase shifter is composed of the composite right/left-handed transmission line configured by the series interdigital capacitor and shunt meander inductor printed on thin dielectric substrate. Bloch impedance and dispersion characteristics are investigated at two frequencies simultaneously. Non-linear frequency-dependent characteristics with large phase shift is confirmed through the electromagnetic simulation.
{"title":"Non-linear phase shifter using composite right/left-handed transmission line on dielectric substrate","authors":"Y. Aizu, N. Michishita, Y. Yamada, K. Cho","doi":"10.1109/IWAT.2013.6518350","DOIUrl":"https://doi.org/10.1109/IWAT.2013.6518350","url":null,"abstract":"In multi-band base station antennas, interference toward neighboring cells at low operating frequency increases since tilting angle is frequency-independent and beamwidth in the vertical plane increases as decreasing the operating frequency. This paper presents a new low-profile phase shifter which comprises non-linear frequency-dependent characteristics. The proposed phase shifter is composed of the composite right/left-handed transmission line configured by the series interdigital capacitor and shunt meander inductor printed on thin dielectric substrate. Bloch impedance and dispersion characteristics are investigated at two frequencies simultaneously. Non-linear frequency-dependent characteristics with large phase shift is confirmed through the electromagnetic simulation.","PeriodicalId":247542,"journal":{"name":"2013 International Workshop on Antenna Technology (iWAT)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115398803","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 : 2013-03-04DOI: 10.1109/IWAT.2013.6518373
R. Gabriel, K. Steinhauser
Data rates in mobile communication networks are increasing dramatically by excessive usage of data traffic and thus driving the tendency for use of adaptive antennas (AAS) for MIMO operation (Multiple Input Multiple Output) and beam forming, procedures for coordinated multipoint transmission (COMP) and tendency to smaller cells. The acceptance of active antennas is very sensitive to the high reliability requirements. Thus the evolution goes step by step from the use of tower top Remote Radio Heads (RRH) to the integration of these radios into antennas and as a logical last step to the distributed transceivers in the antennas (Active Antenna Systems-AAS). These array antennas can be used in different operation modes: Beam forming, Polarization control and MIMO. This paper gives an overview about the actual status of radio integration and typical values for MIMO operation and evaluates the impact of vertical and horizontal steerable AAS on data throughput.
{"title":"Active antennas for MIMO and beamforming operation","authors":"R. Gabriel, K. Steinhauser","doi":"10.1109/IWAT.2013.6518373","DOIUrl":"https://doi.org/10.1109/IWAT.2013.6518373","url":null,"abstract":"Data rates in mobile communication networks are increasing dramatically by excessive usage of data traffic and thus driving the tendency for use of adaptive antennas (AAS) for MIMO operation (Multiple Input Multiple Output) and beam forming, procedures for coordinated multipoint transmission (COMP) and tendency to smaller cells. The acceptance of active antennas is very sensitive to the high reliability requirements. Thus the evolution goes step by step from the use of tower top Remote Radio Heads (RRH) to the integration of these radios into antennas and as a logical last step to the distributed transceivers in the antennas (Active Antenna Systems-AAS). These array antennas can be used in different operation modes: Beam forming, Polarization control and MIMO. This paper gives an overview about the actual status of radio integration and typical values for MIMO operation and evaluates the impact of vertical and horizontal steerable AAS on data throughput.","PeriodicalId":247542,"journal":{"name":"2013 International Workshop on Antenna Technology (iWAT)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115523345","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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