Pub Date : 2007-06-09DOI: 10.1109/APS.2007.4396057
R. Dehbashi, M. Shahabadi
This paper presents a design for a left-handed coplanar waveguide (LHCPW) transmission line without vias or lumped elements. The introduced LHCPW consists of two CPW in two planes. They are mutually coupled by two parallel plate capacitive elements which function as series capacitance elements. Also, the grounded inductive elements are implemented by shorted CPW lines. The proposed LHCPW was simulated using a full-wave Finite Element Method (FEM) solver. Based on the general circuit model of the LH structures, an equivalent circuit of the unit cell of the proposed structure was derived by fitting its scattering parameters to those calculated by the solver. Using the obtained circuit model and calculating the dispersion diagram, we show the anti-parallel directions of the group and the phase velocities below 2.6 GHz, which shows the LH characteristic of the proposed CPW transmission line.
{"title":"Via-Less CPW-based composite right/left-handed transmission line","authors":"R. Dehbashi, M. Shahabadi","doi":"10.1109/APS.2007.4396057","DOIUrl":"https://doi.org/10.1109/APS.2007.4396057","url":null,"abstract":"This paper presents a design for a left-handed coplanar waveguide (LHCPW) transmission line without vias or lumped elements. The introduced LHCPW consists of two CPW in two planes. They are mutually coupled by two parallel plate capacitive elements which function as series capacitance elements. Also, the grounded inductive elements are implemented by shorted CPW lines. The proposed LHCPW was simulated using a full-wave Finite Element Method (FEM) solver. Based on the general circuit model of the LH structures, an equivalent circuit of the unit cell of the proposed structure was derived by fitting its scattering parameters to those calculated by the solver. Using the obtained circuit model and calculating the dispersion diagram, we show the anti-parallel directions of the group and the phase velocities below 2.6 GHz, which shows the LH characteristic of the proposed CPW transmission line.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129306191","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 : 2007-06-09DOI: 10.1109/APS.2007.4396608
I. Wood, D. Dousset, J. Bornemann, S. Claude
Tapered slot antennas (TSA) are lightweight, and low cost per element but retain directivity close to horn antennas. They are planar elements, so they can be integrated on the same substrate as an appropriate feed. The TSA design presented in this paper utilizes antipodal flares and the backwards extension match technique. However the design investigates techniques to increase element gain using high permittivity substrates and demonstrates the TSA capability at high frequency (18-24 GHz).
{"title":"Linear tapered slot antenna with substrate integrated waveguide feed","authors":"I. Wood, D. Dousset, J. Bornemann, S. Claude","doi":"10.1109/APS.2007.4396608","DOIUrl":"https://doi.org/10.1109/APS.2007.4396608","url":null,"abstract":"Tapered slot antennas (TSA) are lightweight, and low cost per element but retain directivity close to horn antennas. They are planar elements, so they can be integrated on the same substrate as an appropriate feed. The TSA design presented in this paper utilizes antipodal flares and the backwards extension match technique. However the design investigates techniques to increase element gain using high permittivity substrates and demonstrates the TSA capability at high frequency (18-24 GHz).","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129360819","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 : 2007-06-09DOI: 10.1109/APS.2007.4395676
U. Navsariwala
The antennas in a mobile device, like a cellular phone, are significantly impacted by the presence of the user, especially in the talk position. Traditionally, this impact has not been accurately modeled and, in many cases, it is completely ignored. This results in an inaccurate prediction of the antenna performance, especially the radiation efficiency, and can lead to poor antenna design. In this article, the modeling of the hand in greater detail is considered. Although many CAD tools have the capability to model the hand geometry in fine detail with multiple materials, there are associated issues dealing with the model complexity and constructing hand phantoms for measurements. Therefore, a balance needs to be reached between the details in the model geometry and materials and the needs of the simulation and measurement tools. In this paper, a homogeneous hand model is presented. The model represents the geometry of the hand in good detail and it can be adapted to form various hand grips. The effect of the material properties of this hand model on the radiation efficiency of a few typical antennas in mobile handsets is studied. These studies illustrate than an effective material property for a homogeneous hand model can be used for a reasonable accuracy in the radiation efficiency of the antennas. A two tissue model consisting of bone and muscle is also studied.
{"title":"Accurate and efficient models of the human hand for the prediction of antenna efficiency in mobile devices","authors":"U. Navsariwala","doi":"10.1109/APS.2007.4395676","DOIUrl":"https://doi.org/10.1109/APS.2007.4395676","url":null,"abstract":"The antennas in a mobile device, like a cellular phone, are significantly impacted by the presence of the user, especially in the talk position. Traditionally, this impact has not been accurately modeled and, in many cases, it is completely ignored. This results in an inaccurate prediction of the antenna performance, especially the radiation efficiency, and can lead to poor antenna design. In this article, the modeling of the hand in greater detail is considered. Although many CAD tools have the capability to model the hand geometry in fine detail with multiple materials, there are associated issues dealing with the model complexity and constructing hand phantoms for measurements. Therefore, a balance needs to be reached between the details in the model geometry and materials and the needs of the simulation and measurement tools. In this paper, a homogeneous hand model is presented. The model represents the geometry of the hand in good detail and it can be adapted to form various hand grips. The effect of the material properties of this hand model on the radiation efficiency of a few typical antennas in mobile handsets is studied. These studies illustrate than an effective material property for a homogeneous hand model can be used for a reasonable accuracy in the radiation efficiency of the antennas. A two tissue model consisting of bone and muscle is also studied.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124570818","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 : 2007-06-09DOI: 10.1109/APS.2007.4395689
Yung-Tao Liu, Saou‐Wen Su, Fa-Shian Chang, Hong‐Twu Chen
An internal shorted patch antenna integrated with a shielding metal case for UMTS mobile phone application has been constructed and tested, and good radiation characteristic has been also observed. The constructed prototype integrates the antenna and the shielding metal case, which provides a coupling-free space for the RF components, battery and other associated elements in the mobile phone. The integrated antenna shows no protruded portions and is very promising to be concealed within the casing of the mobile phone. Furthermore, the antenna occupies no space on the bottom ground or system ground plane. Experimental results have also indicated that the antenna shows acceptable impedance matching characteristic.
{"title":"Internal shorted patch antenna integrated with a shielding metal case for UMTS mobile phone application","authors":"Yung-Tao Liu, Saou‐Wen Su, Fa-Shian Chang, Hong‐Twu Chen","doi":"10.1109/APS.2007.4395689","DOIUrl":"https://doi.org/10.1109/APS.2007.4395689","url":null,"abstract":"An internal shorted patch antenna integrated with a shielding metal case for UMTS mobile phone application has been constructed and tested, and good radiation characteristic has been also observed. The constructed prototype integrates the antenna and the shielding metal case, which provides a coupling-free space for the RF components, battery and other associated elements in the mobile phone. The integrated antenna shows no protruded portions and is very promising to be concealed within the casing of the mobile phone. Furthermore, the antenna occupies no space on the bottom ground or system ground plane. Experimental results have also indicated that the antenna shows acceptable impedance matching characteristic.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130105653","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 : 2007-06-09DOI: 10.1109/APS.2007.4396438
J.K.H. Wong, K. Balmain
The purpose of this work is to investigate the use of the spatial filtering property of hyperbolically anisotropic metamaterials to achieve beam-steering.The present work employs the aforementioned concept in a fixed-frequency antenna array. The radiation beam angle is made tunable by varying the permeability tensor of the metamaterial on which the antenna is realized.
{"title":"A beam-steerable antenna based on the spatial filtering property of hyperbolically anisotropic metamaterials","authors":"J.K.H. Wong, K. Balmain","doi":"10.1109/APS.2007.4396438","DOIUrl":"https://doi.org/10.1109/APS.2007.4396438","url":null,"abstract":"The purpose of this work is to investigate the use of the spatial filtering property of hyperbolically anisotropic metamaterials to achieve beam-steering.The present work employs the aforementioned concept in a fixed-frequency antenna array. The radiation beam angle is made tunable by varying the permeability tensor of the metamaterial on which the antenna is realized.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126693375","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 : 2007-06-09DOI: 10.1109/APS.2007.4395886
S. Ghadarghadr, H. Mosallaei
The main goal of this work is to understand the behavior of electrically small antennas embedded in metamaterials. To do so, the Green's function for small-size antenna located in small-size metamaterial sphere is approximated, then by applying the method of moment with Galerkin's procedure the probe current and input impedance as a function of sphere radius, antenna length, and material properties are derived. The results clearly demonstrate that in most of the designs considering the first dominant mode is not sufficient and one needs to consider higher order terms in Green's function expansion to provide an accurate analysis for antenna performance. A physical insight is highlighted.
{"title":"Electrically small antennas embedded in metamaterials: Closed-form analysis and physical insight","authors":"S. Ghadarghadr, H. Mosallaei","doi":"10.1109/APS.2007.4395886","DOIUrl":"https://doi.org/10.1109/APS.2007.4395886","url":null,"abstract":"The main goal of this work is to understand the behavior of electrically small antennas embedded in metamaterials. To do so, the Green's function for small-size antenna located in small-size metamaterial sphere is approximated, then by applying the method of moment with Galerkin's procedure the probe current and input impedance as a function of sphere radius, antenna length, and material properties are derived. The results clearly demonstrate that in most of the designs considering the first dominant mode is not sufficient and one needs to consider higher order terms in Green's function expansion to provide an accurate analysis for antenna performance. A physical insight is highlighted.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126808852","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 : 2007-06-09DOI: 10.1109/APS.2007.4395596
Cemin Zhang, M. Kuhn, M. Mahfouz, A. Fathy
Investigations of various antipodal Vivaldi antenna array configurations have been carried out. Based on this study, it has been demonstrated that planar arrangement of the Vivaldi elements is preferred over stacked ones and are easier to fabricate as well. Additionally, planar Vivaldi array with mirrored elements placed alternately in E-plane has demonstrated improved cross-polarization as compared to conventional antipodal Vivaldi array configurations.
{"title":"Planar antipodal Vivaldi antenna array configuration for low cross-polarization and reduced mutual coupling performance","authors":"Cemin Zhang, M. Kuhn, M. Mahfouz, A. Fathy","doi":"10.1109/APS.2007.4395596","DOIUrl":"https://doi.org/10.1109/APS.2007.4395596","url":null,"abstract":"Investigations of various antipodal Vivaldi antenna array configurations have been carried out. Based on this study, it has been demonstrated that planar arrangement of the Vivaldi elements is preferred over stacked ones and are easier to fabricate as well. Additionally, planar Vivaldi array with mirrored elements placed alternately in E-plane has demonstrated improved cross-polarization as compared to conventional antipodal Vivaldi array configurations.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126886959","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 : 2007-06-09DOI: 10.1109/APS.2007.4396132
D. Kwon, D. Werner, A. Kildishev, V. Shalaev
Near-IR metamaterials exhibiting dual-band negative-index behavior have been presented. Magnetic resonances in two bands are obtained by incorporating two resonators of different dimensions into one period of an infinitely periodic design. Negative permittivities are provided by thin silver films via the naturally available negative dielectric function at near-IR wavelengths. The desired bands of the NIM behavior can be designed by proper combinations of the magnetic resonator dimensions and the silver film thicknesses. A two-dimensional example with two negative-index bands in the near-IR spectrum was demonstrated. The two-dimensional design was then extended to a three-dimensional doubly-periodic dual-band metamaterial design. It has been pointed out that the use of silver strips or meshes in place of thin continuous films significantly improves the loss characteristics of the metamaterial.
{"title":"Dual-band negative-index metamaterials in the near-infrared frequency range","authors":"D. Kwon, D. Werner, A. Kildishev, V. Shalaev","doi":"10.1109/APS.2007.4396132","DOIUrl":"https://doi.org/10.1109/APS.2007.4396132","url":null,"abstract":"Near-IR metamaterials exhibiting dual-band negative-index behavior have been presented. Magnetic resonances in two bands are obtained by incorporating two resonators of different dimensions into one period of an infinitely periodic design. Negative permittivities are provided by thin silver films via the naturally available negative dielectric function at near-IR wavelengths. The desired bands of the NIM behavior can be designed by proper combinations of the magnetic resonator dimensions and the silver film thicknesses. A two-dimensional example with two negative-index bands in the near-IR spectrum was demonstrated. The two-dimensional design was then extended to a three-dimensional doubly-periodic dual-band metamaterial design. It has been pointed out that the use of silver strips or meshes in place of thin continuous films significantly improves the loss characteristics of the metamaterial.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126914678","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 : 2007-06-09DOI: 10.1109/APS.2007.4395711
A. Cai, X. Qing, Zhi Ning Chen
Smart table represents the ability of a table to detect items placed on it by using RFID technology. The position as well as certain activities of these items could be tracked as RFID tags embedded into these detected items have a unique identification number depending on the chip integrated with the tag. Hence, the table can determine the position and existence of each specific item on it with time. In this paper, the antennas applied in high frequency (HF) RFID smart table applications was addressed. The HF antennas with different sizes are investigated to generate uniform field distribution in an interrogation region.
{"title":"Antenna for RFID smart table","authors":"A. Cai, X. Qing, Zhi Ning Chen","doi":"10.1109/APS.2007.4395711","DOIUrl":"https://doi.org/10.1109/APS.2007.4395711","url":null,"abstract":"Smart table represents the ability of a table to detect items placed on it by using RFID technology. The position as well as certain activities of these items could be tracked as RFID tags embedded into these detected items have a unique identification number depending on the chip integrated with the tag. Hence, the table can determine the position and existence of each specific item on it with time. In this paper, the antennas applied in high frequency (HF) RFID smart table applications was addressed. The HF antennas with different sizes are investigated to generate uniform field distribution in an interrogation region.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129135516","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 : 2007-06-09DOI: 10.1109/APS.2007.4396238
Yongho Kim, H. Morishita, Y. Koyanagi
This study introduces and analyzes the fundamental performance of an L-shaped built-in folded monopole antenna (LBFMA). Device performance is also compared with those of planar inverted-F antenna (PIFA) configuration. The results may be used as a first step in the antenna array design for multiple-antenna devices applied to MIMO applications.
{"title":"Characteristics of L-shaped built-in folded monopole antenna for handsets","authors":"Yongho Kim, H. Morishita, Y. Koyanagi","doi":"10.1109/APS.2007.4396238","DOIUrl":"https://doi.org/10.1109/APS.2007.4396238","url":null,"abstract":"This study introduces and analyzes the fundamental performance of an L-shaped built-in folded monopole antenna (LBFMA). Device performance is also compared with those of planar inverted-F antenna (PIFA) configuration. The results may be used as a first step in the antenna array design for multiple-antenna devices applied to MIMO applications.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123887005","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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