Pub Date : 2009-03-02DOI: 10.1109/IWAT.2009.4906878
Jaewon Kim, A. Gopinath
In this paper, a flat metamaterial antenna lens was proposed to improve the gain of a rectangular patch. Cubic high dielectric resonators periodically embedded in a low dielectric substrate were used as a metamaterial lens. Double-negative metamaterial characteristic are obtained around the degenerate mode resonant frequency of cubic resonators. The antenna gain with this lens has increased by nearly 5 dB, as predicted and also measured experimentally.
{"title":"Simulations and experiments with metamaterial flat antenna lens using cubic high dielectric resonators","authors":"Jaewon Kim, A. Gopinath","doi":"10.1109/IWAT.2009.4906878","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906878","url":null,"abstract":"In this paper, a flat metamaterial antenna lens was proposed to improve the gain of a rectangular patch. Cubic high dielectric resonators periodically embedded in a low dielectric substrate were used as a metamaterial lens. Double-negative metamaterial characteristic are obtained around the degenerate mode resonant frequency of cubic resonators. The antenna gain with this lens has increased by nearly 5 dB, as predicted and also measured experimentally.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"133 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132789981","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 : 2009-03-02DOI: 10.1109/IWAT.2009.4906923
Y. Lu, Y. Huang, H. Chattha
Recently, Wheeler cap method was extended to measure wideband antennas. This paper presents an investigation on the effects of the loss of Wheeler cap on antenna efficiency measurement results. Two caps/cavities (one large and one small) are employed for this study and numerical simulation is also conducted to aid the analysis. Both the experimental and numerical results show the loss due to the imperfection of the cavity can cause a serious problem for obtaining an accurate result. How to eliminate the effects of the cavity loss and improve the measurement accuracy for the Wheeler extended method is an issue to be resolved.
{"title":"Effects of Wheeler cap loss on wideband antenna efficiency measurement results","authors":"Y. Lu, Y. Huang, H. Chattha","doi":"10.1109/IWAT.2009.4906923","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906923","url":null,"abstract":"Recently, Wheeler cap method was extended to measure wideband antennas. This paper presents an investigation on the effects of the loss of Wheeler cap on antenna efficiency measurement results. Two caps/cavities (one large and one small) are employed for this study and numerical simulation is also conducted to aid the analysis. Both the experimental and numerical results show the loss due to the imperfection of the cavity can cause a serious problem for obtaining an accurate result. How to eliminate the effects of the cavity loss and improve the measurement accuracy for the Wheeler extended method is an issue to be resolved.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134446358","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 : 2009-03-02DOI: 10.1109/IWAT.2009.4906938
M. Mohajer, S. Safavi-Naeini
A MIMO antenna design optimization method based on minimization of correlation coefficients for maximizing the system capacity in Multiple-Input Multiple-Output (MIMO) systems is presented. The packaging effects on radiation field patterns of MIMO antenna elements have also been included using a reciprocity approach and Method of Moments (MoM) analysis. As practical examples, optimal location of two patch antennas placed on a small ground plane and conducting cube have been determined using the proposed method.
{"title":"MIMO antenna optimization using method of moments analysis","authors":"M. Mohajer, S. Safavi-Naeini","doi":"10.1109/IWAT.2009.4906938","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906938","url":null,"abstract":"A MIMO antenna design optimization method based on minimization of correlation coefficients for maximizing the system capacity in Multiple-Input Multiple-Output (MIMO) systems is presented. The packaging effects on radiation field patterns of MIMO antenna elements have also been included using a reciprocity approach and Method of Moments (MoM) analysis. As practical examples, optimal location of two patch antennas placed on a small ground plane and conducting cube have been determined using the proposed method.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129860985","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 : 2009-03-02DOI: 10.1109/IWAT.2009.4906889
Peng Jin, R. Ziolkowski
Various efficient electrically small antennas have been designed based on metamaterial shells and metamaterial-inspired structures. Several metamaterial-inspired antennas have been fabricated and the results have confirmed the design predictions. The Z antenna, a simplified version of the metamaterial-inspired 2D electric EZ antenna, has been designed and tested successfully. The experimentally tested design of this resonant near-field parasitic element, coax-fed monopole antenna will be discussed; its predicted performance and comparisons with experimental results will be reviewed and presented.
{"title":"Antenna designs and testing","authors":"Peng Jin, R. Ziolkowski","doi":"10.1109/IWAT.2009.4906889","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906889","url":null,"abstract":"Various efficient electrically small antennas have been designed based on metamaterial shells and metamaterial-inspired structures. Several metamaterial-inspired antennas have been fabricated and the results have confirmed the design predictions. The Z antenna, a simplified version of the metamaterial-inspired 2D electric EZ antenna, has been designed and tested successfully. The experimentally tested design of this resonant near-field parasitic element, coax-fed monopole antenna will be discussed; its predicted performance and comparisons with experimental results will be reviewed and presented.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"249 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133117000","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 : 2009-03-02DOI: 10.1109/IWAT.2009.4906930
S. R. Bhadra Choudhuri, D. R. Poddar, R. Ghatak, R. K. Mishra
In this paper complementary split ring resonator (CSRR) array are realized on the ground plane along the length of a rectangular microstrip antenna (RMSA) that improves the realized gain by providing better match at the desired resonant frequency. Dual band operation is also observed when the array of CSRR designed at double the RMSA resonant frequency is inserted half way underneath the patch.
{"title":"Modulating properties of a microstrip patch antenna using complementary split ring resonator","authors":"S. R. Bhadra Choudhuri, D. R. Poddar, R. Ghatak, R. K. Mishra","doi":"10.1109/IWAT.2009.4906930","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906930","url":null,"abstract":"In this paper complementary split ring resonator (CSRR) array are realized on the ground plane along the length of a rectangular microstrip antenna (RMSA) that improves the realized gain by providing better match at the desired resonant frequency. Dual band operation is also observed when the array of CSRR designed at double the RMSA resonant frequency is inserted half way underneath the patch.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122983784","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 : 2009-03-02DOI: 10.1109/IWAT.2009.4906893
P. Lindberg, A. Kaikkonen, M. Sudow
A technique for reducing the antenna induced electromagnetic fields in the vicinity of the earpiece speaker in mobile phones is presented, thereby improving the hearing aid compatibility (HAC). By introducing resonant quarter-wave short-circuited transmission lines to each long side of the chassis edges, the earpiece speaker section of the chassis is electrically decoupled from the antenna section. The proposed technique has been validated through simulations and measurements.
{"title":"Improvement of hearing aid compatibility (HAC) of terminal antennas using wavetraps","authors":"P. Lindberg, A. Kaikkonen, M. Sudow","doi":"10.1109/IWAT.2009.4906893","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906893","url":null,"abstract":"A technique for reducing the antenna induced electromagnetic fields in the vicinity of the earpiece speaker in mobile phones is presented, thereby improving the hearing aid compatibility (HAC). By introducing resonant quarter-wave short-circuited transmission lines to each long side of the chassis edges, the earpiece speaker section of the chassis is electrically decoupled from the antenna section. The proposed technique has been validated through simulations and measurements.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123416476","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 : 2009-03-02DOI: 10.1109/IWAT.2009.4906927
N. Haga, K. Saito, Masaharu Takahashi, K. Ito
Characteristics of antennas and propagation channels in on-body communications have been ascertained. Earlier studies indicated that not only maximization of path loss between body-mounted devises by use of monopole-like antennas but also countermeasures against fading by use of multi polarization antennas may be an important issue. Multi polarization can be obtained by perturbing the patch antennas. That is well known as circularly polarized patch antennas. In this paper, a perturbed patch antenna on a small ground plane in vicinity of the human body is characterized for some purposes such as challenge for co-existence of antenna and the human body rather than shutting out the body effects. Specifically, variation of input impedance, axial ratio, radiation efficiency, and radiation pattern of the antenna are evaluated by use of numerical calculation.
{"title":"Fundamental study on a perturbed patch antenna on small ground plane aimed at multi polarization and matching stability on WBAN applications","authors":"N. Haga, K. Saito, Masaharu Takahashi, K. Ito","doi":"10.1109/IWAT.2009.4906927","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906927","url":null,"abstract":"Characteristics of antennas and propagation channels in on-body communications have been ascertained. Earlier studies indicated that not only maximization of path loss between body-mounted devises by use of monopole-like antennas but also countermeasures against fading by use of multi polarization antennas may be an important issue. Multi polarization can be obtained by perturbing the patch antennas. That is well known as circularly polarized patch antennas. In this paper, a perturbed patch antenna on a small ground plane in vicinity of the human body is characterized for some purposes such as challenge for co-existence of antenna and the human body rather than shutting out the body effects. Specifically, variation of input impedance, axial ratio, radiation efficiency, and radiation pattern of the antenna are evaluated by use of numerical calculation.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"493 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124450652","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 : 2009-03-02DOI: 10.1109/IWAT.2009.4906880
M. Ismail, A. Zain
There has been much interest recently in developing reconfigurable reflectarray antenna for tunable microwave applications. Liquid crystal (LC) has been given much attention due to its dielectric anisotropy property which allows the change in the frequency and hence the phase of reflection. In this paper, the phase tunability of the periodic array using K15 nematic liquid crystal as the dielectric permittivity is presented. Simulated and experimental results at X-band are used to compare the plane wave scattering parameter from a two patch reflectarray cell of 500 μm. A tunable dynamic phase range of 221° is achieved over a broad band of 220 MHz which also gives a tunability of 2.2%.
{"title":"Phase tunability of reflectarray patch elements using tunable dielectric substrate of nematic liquid crystal","authors":"M. Ismail, A. Zain","doi":"10.1109/IWAT.2009.4906880","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906880","url":null,"abstract":"There has been much interest recently in developing reconfigurable reflectarray antenna for tunable microwave applications. Liquid crystal (LC) has been given much attention due to its dielectric anisotropy property which allows the change in the frequency and hence the phase of reflection. In this paper, the phase tunability of the periodic array using K15 nematic liquid crystal as the dielectric permittivity is presented. Simulated and experimental results at X-band are used to compare the plane wave scattering parameter from a two patch reflectarray cell of 500 μm. A tunable dynamic phase range of 221° is achieved over a broad band of 220 MHz which also gives a tunability of 2.2%.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126468244","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 : 2009-03-02DOI: 10.1109/IWAT.2009.4906928
Q. Ye, Zhi Ning Chen, T. See
A miniaturized printed UWB antenna has been proposed for WLAN application, especially to fit into the USB dongle. The antenna dimension is optimized by Zeland's Fidelity simulator. The return loss has a UWB frequency range from 3 GHz to 11.2 GHz. Parametric study has been conducted by varying radiator's structure and the feed line location.
{"title":"Miniaturization of small printed UWB antenna for WPAN applications","authors":"Q. Ye, Zhi Ning Chen, T. See","doi":"10.1109/IWAT.2009.4906928","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906928","url":null,"abstract":"A miniaturized printed UWB antenna has been proposed for WLAN application, especially to fit into the USB dongle. The antenna dimension is optimized by Zeland's Fidelity simulator. The return loss has a UWB frequency range from 3 GHz to 11.2 GHz. Parametric study has been conducted by varying radiator's structure and the feed line location.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121661119","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 : 2009-03-02DOI: 10.1109/IWAT.2009.4906960
T. Laitinen, S. Ranvier, J. Toivanen, J. Ilvonen, L. Nyberg, J. Krogerus, C. Icheln, P. Vainikainen
The boom of the wireless communications industry during the last 10 to 20 years created an increased need for developing particularly small-antenna measurement techniques. Since then, the research on small communications antenna measurements has followed the evolution of numerous new radio systems and the increase in the operating frequencies. The purpose of this paper is to give an overview of the most recent research on novel measurement methods for small antennas from the UHF band to the 60-GHz band. The subjects include multi-probe antenna measurement systems, spherical scanning techniques, probe correction techniques, probes, and 60-GHz on-wafer antenna measurements.
{"title":"Research activities on small antenna measurements at Helsinki University of Technology","authors":"T. Laitinen, S. Ranvier, J. Toivanen, J. Ilvonen, L. Nyberg, J. Krogerus, C. Icheln, P. Vainikainen","doi":"10.1109/IWAT.2009.4906960","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906960","url":null,"abstract":"The boom of the wireless communications industry during the last 10 to 20 years created an increased need for developing particularly small-antenna measurement techniques. Since then, the research on small communications antenna measurements has followed the evolution of numerous new radio systems and the increase in the operating frequencies. The purpose of this paper is to give an overview of the most recent research on novel measurement methods for small antennas from the UHF band to the 60-GHz band. The subjects include multi-probe antenna measurement systems, spherical scanning techniques, probe correction techniques, probes, and 60-GHz on-wafer antenna measurements.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133951544","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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