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.2009.4906904
A. Sellier, S. Burokur, B. Kanté, A. Lustrac
We present, design and analyze a novel planar Left-Handed (LH) metamaterial in the microwave region. This metamaterial is composed of only cut metallic wires and is used under normal-to-plane incidence. Using Finite Element Method (FEM) based simulations and microwave experiments, we have investigated the material properties of the structure. Simultaneous negative values are observed for the permittivity ε and permeability μ by the inversion method from the transmission and reflection responses. A negative index n is verified in a bulk prism engineered by stacking several layers of the metamaterial. Our work demonstrates the feasibility of a LH metamaterial composed of only cut wires.
{"title":"Novel cut wires metamaterial exhibiting negative refractive index","authors":"A. Sellier, S. Burokur, B. Kanté, A. Lustrac","doi":"10.1109/IWAT.2009.4906904","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906904","url":null,"abstract":"We present, design and analyze a novel planar Left-Handed (LH) metamaterial in the microwave region. This metamaterial is composed of only cut metallic wires and is used under normal-to-plane incidence. Using Finite Element Method (FEM) based simulations and microwave experiments, we have investigated the material properties of the structure. Simultaneous negative values are observed for the permittivity ε and permeability μ by the inversion method from the transmission and reflection responses. A negative index n is verified in a bulk prism engineered by stacking several layers of the metamaterial. Our work demonstrates the feasibility of a LH metamaterial composed of only cut wires.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"41 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":"129117395","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.2009.4906878
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.2009.4906947
J. Holopainen, R. Valkonen, C. Icheln, O. Kivekas, P. Vainikainen
This paper reviews different recent approaches taken towards the realisation of space-efficient antenna structures for mobile terminals without the use of traditional self-resonant antenna structures, but instead by coupling the RF power directly to the wavemodes of a regular-sized terminal chassis. Several realisations of possible coupling structures are presented. In order to re-use the same coupling structure for several desired radio systems, reconfigurable matching circuitries have to be designed and optimised, which is a challenge that is highlighted in this paper. Also, the effect that the user's hands have on the impedance and radiation characteristics of a coupling-based DVB-H antenna structure is investigated. This knowledge can facilitate the optimal design of the mentioned tuneable matching circuitry for coping with the many possible usage scenarios.
{"title":"Recent advances in coupling-based antenna structures for mobile terminals","authors":"J. Holopainen, R. Valkonen, C. Icheln, O. Kivekas, P. Vainikainen","doi":"10.1109/IWAT.2009.4906947","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906947","url":null,"abstract":"This paper reviews different recent approaches taken towards the realisation of space-efficient antenna structures for mobile terminals without the use of traditional self-resonant antenna structures, but instead by coupling the RF power directly to the wavemodes of a regular-sized terminal chassis. Several realisations of possible coupling structures are presented. In order to re-use the same coupling structure for several desired radio systems, reconfigurable matching circuitries have to be designed and optimised, which is a challenge that is highlighted in this paper. Also, the effect that the user's hands have on the impedance and radiation characteristics of a coupling-based DVB-H antenna structure is investigated. This knowledge can facilitate the optimal design of the mentioned tuneable matching circuitry for coping with the many possible usage scenarios.","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":"127610928","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.2009.4906968
X. Qing, C. K. Goh, Zhi Ning Chen
A methodology to measure UHF RFID tag antenna impedance using network approach is presented. The balanced UHF RFID tag antenna is considered as a two-port network and the impedance of the antenna is characterized by network parameters. In the measurement, the balanced antenna is connected to the two ports of a two-port vector network analyzer (VNA) through a test fixture. The influence of the test fixture is de-embedded by using a portextension technique and then the antenna impedance is extracted directly from the measured S-parameters. The proposed method is validated by comparing the measured and the simulated impedance of an asymmetrical dipole antenna and a symmetrical meander line dipole antenna both for UHF RFID tags.
{"title":"Measurement of UHF RFID tag antenna impedance","authors":"X. Qing, C. K. Goh, Zhi Ning Chen","doi":"10.1109/IWAT.2009.4906968","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906968","url":null,"abstract":"A methodology to measure UHF RFID tag antenna impedance using network approach is presented. The balanced UHF RFID tag antenna is considered as a two-port network and the impedance of the antenna is characterized by network parameters. In the measurement, the balanced antenna is connected to the two ports of a two-port vector network analyzer (VNA) through a test fixture. The influence of the test fixture is de-embedded by using a portextension technique and then the antenna impedance is extracted directly from the measured S-parameters. The proposed method is validated by comparing the measured and the simulated impedance of an asymmetrical dipole antenna and a symmetrical meander line dipole antenna both for UHF RFID tags.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"500 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":"127591180","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}
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