Pub Date : 2010-03-01DOI: 10.1109/IWAT.2010.5464647
J. Iriarte, I. Ederra, R. Gonzalo, P. de Maagt
High dielectric EBG substrates can be used in patch antenna configurations to reduce size and mitigate substrate modes keeping reasonable radiation efficiency values, η≫0.55. At the same time, in array configurations they avoid grating lobes and scan blindness phenomenon at the same time, as distance and coupling between elements can be reduced. In this paper a 2×2 array configuration using these high dielectric constant (ZTT) EBG substrates is presented. The array has been fabricated and measured showing the coupling reduction achieved by the inclusion of the EBG in a configuration with a distance between elements lower than 0,5λ0. This short distance together with the coupling reduction results in a configuration which doesn't suffer from grating lobes and scan blindness problems.
{"title":"Coupling reduction in a 2×2 high dielectric constant EBG patch array","authors":"J. Iriarte, I. Ederra, R. Gonzalo, P. de Maagt","doi":"10.1109/IWAT.2010.5464647","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464647","url":null,"abstract":"High dielectric EBG substrates can be used in patch antenna configurations to reduce size and mitigate substrate modes keeping reasonable radiation efficiency values, η≫0.55. At the same time, in array configurations they avoid grating lobes and scan blindness phenomenon at the same time, as distance and coupling between elements can be reduced. In this paper a 2×2 array configuration using these high dielectric constant (ZTT) EBG substrates is presented. The array has been fabricated and measured showing the coupling reduction achieved by the inclusion of the EBG in a configuration with a distance between elements lower than 0,5λ0. This short distance together with the coupling reduction results in a configuration which doesn't suffer from grating lobes and scan blindness problems.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129378794","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 : 2010-03-01DOI: 10.1109/IWAT.2010.5464735
M. Jenning, M. Kurras, D. Plettemeier
In his paper a transition from a WR-3 rectangular waveguide to an 85 µm wide microstrip line is presented. The transition is a low-cost transition fabricated in a standard lithography process on 5mil thick Rogers RO3003 material. Measurement results will be given and problems, especially those caused by fabrication tolerances with respect to the wavelength, will be discussed.
{"title":"Waveguide to microstrip transition at 235 GHz","authors":"M. Jenning, M. Kurras, D. Plettemeier","doi":"10.1109/IWAT.2010.5464735","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464735","url":null,"abstract":"In his paper a transition from a WR-3 rectangular waveguide to an 85 µm wide microstrip line is presented. The transition is a low-cost transition fabricated in a standard lithography process on 5mil thick Rogers RO3003 material. Measurement results will be given and problems, especially those caused by fabrication tolerances with respect to the wavelength, will be discussed.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128538706","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 : 2010-03-01DOI: 10.1109/IWAT.2010.5464738
Y. Lu, Y. Huang, H. Chattha, Y. Shen, S. Boyes
Many monopole UWB antennas have been developed over the years. One common problem is that their performance is heavily affected by the ground plane. In this paper, a new approach on how to reduce the ground plane effects on such antennas is proposed: L-shape cuts on the edge of the ground plane are introduced and it is shown that this method changes the current distribution on the ground plane without sacrificing the frequency and time domain performance, which makes such antennas more suitable for real applications with different sizes of the ground plane.
{"title":"An elliptical UWB monopole antenna with reduced ground plane effects","authors":"Y. Lu, Y. Huang, H. Chattha, Y. Shen, S. Boyes","doi":"10.1109/IWAT.2010.5464738","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464738","url":null,"abstract":"Many monopole UWB antennas have been developed over the years. One common problem is that their performance is heavily affected by the ground plane. In this paper, a new approach on how to reduce the ground plane effects on such antennas is proposed: L-shape cuts on the edge of the ground plane are introduced and it is shown that this method changes the current distribution on the ground plane without sacrificing the frequency and time domain performance, which makes such antennas more suitable for real applications with different sizes of the ground plane.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"354 2‐3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120838334","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 : 2010-03-01DOI: 10.1109/IWAT.2010.5464859
P. Kildal
The paper will describe the fundamental characteristics of different wave propagation environments (such as Rayleigh fading, Rice fading, and polarization balance; coherence bandwidth and time delay spread; and fading speed, coherence time and Doppler spread), and relate these characteristics to the Line-Of-Sight (LOS) emulated by good anechoic chambers, and the rich isotropic multipath environment emulated by good reverberation chambers. The conclusion is that the reverberation chambers mean the same to Over-The-Air (OTA) testing of antennas for use in multipath environments as anechoic chambers do to antennas for free-space-like environments. They enable a unique, objective and repeatable antenna characterization that cannot be achieved in other environments. Thereby, the reverberation chambers and anechoic chambers complement each other perfectly.
{"title":"OTA measurements of wireless stations in reverberation chamber versus anechoic chamber: from accuracy models to testing of MIMO systems","authors":"P. Kildal","doi":"10.1109/IWAT.2010.5464859","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464859","url":null,"abstract":"The paper will describe the fundamental characteristics of different wave propagation environments (such as Rayleigh fading, Rice fading, and polarization balance; coherence bandwidth and time delay spread; and fading speed, coherence time and Doppler spread), and relate these characteristics to the Line-Of-Sight (LOS) emulated by good anechoic chambers, and the rich isotropic multipath environment emulated by good reverberation chambers. The conclusion is that the reverberation chambers mean the same to Over-The-Air (OTA) testing of antennas for use in multipath environments as anechoic chambers do to antennas for free-space-like environments. They enable a unique, objective and repeatable antenna characterization that cannot be achieved in other environments. Thereby, the reverberation chambers and anechoic chambers complement each other perfectly.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116536636","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 : 2010-03-01DOI: 10.1109/IWAT.2010.5464857
K. Karlsson, J. Carlsson
A method for analyzing and optimizing multi-port antennas in MIMO systems is presented and exemplified. The method is based on work presented in [1]–[3] and uses data from full wave electromagnetic field (EM) solvers in combination with circuit simulations for efficient calculations of radiation properties of multi-port antennas. Here it is shown that the method can also be used for simulations of antennas in a MIMO system. The main advantage of the proposed method is that only a few full-wave simulations, which usually are time consuming, are needed when e.g. optimizing the matching circuits for a multi-port antenna. Since embedded element patterns are used, MIMO capacity (and of course all other relevant antenna parameters) can efficiently be computed for any matching network connected to the antenna ports and for different channel models, both statistical and deterministic.
{"title":"Analysis and optimization of MIMO capacity by using circuit simulation and embedded element patterns from full-wave simulation","authors":"K. Karlsson, J. Carlsson","doi":"10.1109/IWAT.2010.5464857","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464857","url":null,"abstract":"A method for analyzing and optimizing multi-port antennas in MIMO systems is presented and exemplified. The method is based on work presented in [1]–[3] and uses data from full wave electromagnetic field (EM) solvers in combination with circuit simulations for efficient calculations of radiation properties of multi-port antennas. Here it is shown that the method can also be used for simulations of antennas in a MIMO system. The main advantage of the proposed method is that only a few full-wave simulations, which usually are time consuming, are needed when e.g. optimizing the matching circuits for a multi-port antenna. Since embedded element patterns are used, MIMO capacity (and of course all other relevant antenna parameters) can efficiently be computed for any matching network connected to the antenna ports and for different channel models, both statistical and deterministic.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114336711","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 : 2010-03-01DOI: 10.1109/IWAT.2010.5464755
J. Gomez, A. Tayebi, I. González, F. Cátedra
This work presents an efficient and powerful approach for electromagnetic field analysis of complex 3D bodies. The method is able to provide fast and accurate analysis of arbitrary metallic and dielectric/magnetic structures, and combines the Moment Method (MM), the Multilevel Fast Multipole Algorithm (MLFMA), Physics Optics (PO) and the Characteristics Basis Function Method (CBFM) to solve very large scattering problems. Moreover, in order to minimize memory and time requirements, a parallelization process has been carried out by using the Message Passing Interface (MPI) algorithm. The code has been validated in many applications providing accurate predictions compared with measurements. As an example, a dual-band reflectarray is analyzed to check the performance of the proposed code.
{"title":"Analysis of a dual-band reflectorarray by using a full wave moment method code","authors":"J. Gomez, A. Tayebi, I. González, F. Cátedra","doi":"10.1109/IWAT.2010.5464755","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464755","url":null,"abstract":"This work presents an efficient and powerful approach for electromagnetic field analysis of complex 3D bodies. The method is able to provide fast and accurate analysis of arbitrary metallic and dielectric/magnetic structures, and combines the Moment Method (MM), the Multilevel Fast Multipole Algorithm (MLFMA), Physics Optics (PO) and the Characteristics Basis Function Method (CBFM) to solve very large scattering problems. Moreover, in order to minimize memory and time requirements, a parallelization process has been carried out by using the Message Passing Interface (MPI) algorithm. The code has been validated in many applications providing accurate predictions compared with measurements. As an example, a dual-band reflectarray is analyzed to check the performance of the proposed code.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115465803","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 : 2010-03-01DOI: 10.1109/IWAT.2010.5464783
Daisuke Usui, T. Arima, H. Kawai, K. Wake, Soichi Watanabe, T. Uno
The aim of this study is to develop an animal exposure system for investigating biological effects of local exposure to microwaves from mobile phones. Currently, new mobile communication systems using a 3.4 GHz band are being developed. In this paper, an exposure system using a rectangular loop antenna is proposed for investigating the biological effects of microwaves in the 3.4 GHz band. The proposed antenna has a simple structure and can be tuned to a resonant frequency between 3.3 and 3.8 GHz by changing the feed point. Numerical dosimetry result shows good locality for 2–4 week-old rat model.
{"title":"Development of tunable head local exposure system for rats using rectangular loop antenna in 3.4 GHz band","authors":"Daisuke Usui, T. Arima, H. Kawai, K. Wake, Soichi Watanabe, T. Uno","doi":"10.1109/IWAT.2010.5464783","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464783","url":null,"abstract":"The aim of this study is to develop an animal exposure system for investigating biological effects of local exposure to microwaves from mobile phones. Currently, new mobile communication systems using a 3.4 GHz band are being developed. In this paper, an exposure system using a rectangular loop antenna is proposed for investigating the biological effects of microwaves in the 3.4 GHz band. The proposed antenna has a simple structure and can be tuned to a resonant frequency between 3.3 and 3.8 GHz by changing the feed point. Numerical dosimetry result shows good locality for 2–4 week-old rat model.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127936904","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 : 2010-03-01DOI: 10.1109/IWAT.2010.5464858
C. Volmer, R. Stephan, M. Hein
Mutual radiator coupling is known to impair the performance of modern multi-antenna communications concepts, such as diversity or MIMO. In recent years we have developed a comprehensive framework for assessing the quality of mutually coupled arrays in order to facilitate the development of highly compact designs for mobile consumer applications. The present paper summarises these ideas and attempts to convey additional insights into mutual coupling.
{"title":"Evaluation of compact antenna arrays for mobile communications applications","authors":"C. Volmer, R. Stephan, M. Hein","doi":"10.1109/IWAT.2010.5464858","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464858","url":null,"abstract":"Mutual radiator coupling is known to impair the performance of modern multi-antenna communications concepts, such as diversity or MIMO. In recent years we have developed a comprehensive framework for assessing the quality of mutually coupled arrays in order to facilitate the development of highly compact designs for mobile consumer applications. The present paper summarises these ideas and attempts to convey additional insights into mutual coupling.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127698765","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 : 2010-03-01DOI: 10.1109/IWAT.2010.5464677
Li Zhang, Yewen Zhang
Some researchers have analyzed the properties of pairing together slabs with opposite signs for the real parts of their constitutive parameters, such as resonance, tunneling and transparency. In this paper, we try to understand the mechanism of established process of the tunneling mode with time-domain method. Phase difference between the electric field and magnetic field is studied, and variations of periods of waves during established process can be found in the pair with simulation. The energy distribution along the epsilon negative and mu negative pair also can be discussed. Experimental results based on 1D microstrip structure show good accordance with simulated results.
{"title":"Experimental research on establishment of the tunneling mode in a pair of epsilon-negative and mu-negative by time-domain method","authors":"Li Zhang, Yewen Zhang","doi":"10.1109/IWAT.2010.5464677","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464677","url":null,"abstract":"Some researchers have analyzed the properties of pairing together slabs with opposite signs for the real parts of their constitutive parameters, such as resonance, tunneling and transparency. In this paper, we try to understand the mechanism of established process of the tunneling mode with time-domain method. Phase difference between the electric field and magnetic field is studied, and variations of periods of waves during established process can be found in the pair with simulation. The energy distribution along the epsilon negative and mu negative pair also can be discussed. Experimental results based on 1D microstrip structure show good accordance with simulated results.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128017317","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 : 2010-03-01DOI: 10.1109/IWAT.2010.5464758
W. Hong, Chao Yu, Chen Yu, Guohua Zhai, W. Qin, L. Chiu, Zhenqi Kuai
Printed wideband and ultra-wideband (UWB) antennas are the simple and low cost electromagnetic radiator design for the front-end system with the low-power and high-data-ratio transmissions. Antenna with stable and directional radiation pattern is critical to maintain the link gain of the wireless communication. With co-existence of UWB and other different wireless systems, UWB antenna with notched band(s) is an effective way to suppress the interference between these systems. This invited talk reviews some of the recent works on these areas, which has been pursued by the author's research group.
{"title":"Frequency notched wideband printed directional antennas","authors":"W. Hong, Chao Yu, Chen Yu, Guohua Zhai, W. Qin, L. Chiu, Zhenqi Kuai","doi":"10.1109/IWAT.2010.5464758","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464758","url":null,"abstract":"Printed wideband and ultra-wideband (UWB) antennas are the simple and low cost electromagnetic radiator design for the front-end system with the low-power and high-data-ratio transmissions. Antenna with stable and directional radiation pattern is critical to maintain the link gain of the wireless communication. With co-existence of UWB and other different wireless systems, UWB antenna with notched band(s) is an effective way to suppress the interference between these systems. This invited talk reviews some of the recent works on these areas, which has been pursued by the author's research group.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126708321","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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