Pub Date : 2007-03-21DOI: 10.1109/IWAT.2007.370122
R. Kariyawasam, Yue Gao, C. C. Chiau, Xiao-dong Chen, C. Parini, Junsheng Yu
This paper presents a study on a dielectric loaded folded half loop antenna operating at UHF (ultra high frequency) band for DVB-H (digital video broadcasting - handheld) terminals. It is an optimisation of the folded half loop antenna proposed in our previous work. The proposed antenna has a 43% reduction in volume compared to the antenna proposed in our previous work. This design also eliminates the in-band second resonance present in the previous design. Due to the ground plane independency of the antenna it can be mounted on any type of ground plate, thus improving the adaptability to different terminal designs
{"title":"Dielectric Loaded Folded Half Loop Antenna for DVB-H Terminals","authors":"R. Kariyawasam, Yue Gao, C. C. Chiau, Xiao-dong Chen, C. Parini, Junsheng Yu","doi":"10.1109/IWAT.2007.370122","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370122","url":null,"abstract":"This paper presents a study on a dielectric loaded folded half loop antenna operating at UHF (ultra high frequency) band for DVB-H (digital video broadcasting - handheld) terminals. It is an optimisation of the folded half loop antenna proposed in our previous work. The proposed antenna has a 43% reduction in volume compared to the antenna proposed in our previous work. This design also eliminates the in-band second resonance present in the previous design. Due to the ground plane independency of the antenna it can be mounted on any type of ground plate, thus improving the adaptability to different terminal designs","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130950761","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370167
Tzong-Chee Yo, Chien-Ming Lee, C. Luo
This paper presents a design for circular patch antenna with single feed for circular polarization. As an example, patch antenna is designed to operate CP in the ISM band (2.4-2.483 GHz) for WLAN and satellite communication application. CP of the proposed structure can be achieved by embedding two circular slots in the patch resonator. By changing the size and position of the slots, two orthogonal modes with equal amplitude and 90deg out of phase are simultaneously excited. The proposed CP antennas are excited by only single feed without using 90deg phase shifter. By proper arrangement of two circular slots, dual band antenna for WLAN and DMB application can also be successfully excited
{"title":"Small Single Band Circular Polarization and Dual Band Circular Patch Antenna","authors":"Tzong-Chee Yo, Chien-Ming Lee, C. Luo","doi":"10.1109/IWAT.2007.370167","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370167","url":null,"abstract":"This paper presents a design for circular patch antenna with single feed for circular polarization. As an example, patch antenna is designed to operate CP in the ISM band (2.4-2.483 GHz) for WLAN and satellite communication application. CP of the proposed structure can be achieved by embedding two circular slots in the patch resonator. By changing the size and position of the slots, two orthogonal modes with equal amplitude and 90deg out of phase are simultaneously excited. The proposed CP antennas are excited by only single feed without using 90deg phase shifter. By proper arrangement of two circular slots, dual band antenna for WLAN and DMB application can also be successfully excited","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130685047","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370190
T. Cui, Ruopeng Liu, Bo Zhao, X. Lin, H. Ma
Summary form only given. In this talk, we present a new structure to amplify the evanescent waves. The structure is composed of two layers. The first layer is realized by a periodic structure with unit cell of series inductor and shunt capacitor (LC), and the second layer is realized by a periodic structure with unit cell of series capacitor and shunt inductor (CL). We show that both the LC and CL structures are equivalent to the crystal bandgap metamaterials, whose equivalent permittivity and permeability have been derived. Under certain frequency bands, evanescent waves are supported in both LC and CL structures. When such two structures are cascaded together to form a bilayer, we show that evanescent waves existing in two single layers can be amplified exponentially if the resonant conditions are satisfied. Such resonant conditions are equivalent to the anti-matching conditions for the permittivity and permeability of the crystal bandgap metamaterials. We present circuit-simulation results of the LC and CL structures arid theoretical predictions of the equivalent crystal bandgap materials, which have excellent agreements. From the simulation results, we clearly observe the exponentially increasing and decreasing distribution of electric field. We further propose an experiment using lumped capacitors and inductors mounted on a printed circuit board to verify the EWA phenomena. The EWA feature in the LC-LC structure can find important applications in the new-concept microwave components, for example, the extremely-narrow band filters.
{"title":"A New Metamaterial Structure to Amplify Evanescent Waves and Its Applications in Microwave Components","authors":"T. Cui, Ruopeng Liu, Bo Zhao, X. Lin, H. Ma","doi":"10.1109/IWAT.2007.370190","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370190","url":null,"abstract":"Summary form only given. In this talk, we present a new structure to amplify the evanescent waves. The structure is composed of two layers. The first layer is realized by a periodic structure with unit cell of series inductor and shunt capacitor (LC), and the second layer is realized by a periodic structure with unit cell of series capacitor and shunt inductor (CL). We show that both the LC and CL structures are equivalent to the crystal bandgap metamaterials, whose equivalent permittivity and permeability have been derived. Under certain frequency bands, evanescent waves are supported in both LC and CL structures. When such two structures are cascaded together to form a bilayer, we show that evanescent waves existing in two single layers can be amplified exponentially if the resonant conditions are satisfied. Such resonant conditions are equivalent to the anti-matching conditions for the permittivity and permeability of the crystal bandgap metamaterials. We present circuit-simulation results of the LC and CL structures arid theoretical predictions of the equivalent crystal bandgap materials, which have excellent agreements. From the simulation results, we clearly observe the exponentially increasing and decreasing distribution of electric field. We further propose an experiment using lumped capacitors and inductors mounted on a printed circuit board to verify the EWA phenomena. The EWA feature in the LC-LC structure can find important applications in the new-concept microwave components, for example, the extremely-narrow band filters.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126820353","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370149
A. Ali, M.A. Khan, Zhirun Hu
This paper presents a microstrip patch antenna integrated with complementary split ring resonator (CSRR) etched in the ground plane. It is demonstrated that the application of the resonating ring eliminates the spurious harmonics associated with the original structure. Furthermore the return loss at resonance is improved by the inclusion of the CSRRs reaching 20 dB compared with 12 dB achieved by the original structure.
{"title":"Microstrip Patch Antenna with Harmonic Suppression using Complementary Split Ring Resonators","authors":"A. Ali, M.A. Khan, Zhirun Hu","doi":"10.1109/IWAT.2007.370149","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370149","url":null,"abstract":"This paper presents a microstrip patch antenna integrated with complementary split ring resonator (CSRR) etched in the ground plane. It is demonstrated that the application of the resonating ring eliminates the spurious harmonics associated with the original structure. Furthermore the return loss at resonance is improved by the inclusion of the CSRRs reaching 20 dB compared with 12 dB achieved by the original structure.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125328344","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370153
S. Arslanagić, R. Ziolkowski, O. Breinbjerg
An antenna configuration that consists of an arbitrarily located electric line source that radiates in the presence of concentric metamaterial cylinders is examined. With the emphasis on the so-called quadrupolar structure, it is shown that such electrically small configurations may offer significant enhancements of the radiated power. Furthermore, the possibility of controlling the pattern by properly locating the electric line source with respect to the structure, thereby offering a means of obtaining electrically small metamaterial-based directive antennas, is also demonstrated.
{"title":"Far-Field Properties of a Line Source-Excited Electrically Small Quadrupolar Metamaterial Cylindrical Shell","authors":"S. Arslanagić, R. Ziolkowski, O. Breinbjerg","doi":"10.1109/IWAT.2007.370153","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370153","url":null,"abstract":"An antenna configuration that consists of an arbitrarily located electric line source that radiates in the presence of concentric metamaterial cylinders is examined. With the emphasis on the so-called quadrupolar structure, it is shown that such electrically small configurations may offer significant enhancements of the radiated power. Furthermore, the possibility of controlling the pattern by properly locating the electric line source with respect to the structure, thereby offering a means of obtaining electrically small metamaterial-based directive antennas, is also demonstrated.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126716327","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370084
G. Ruvio, Max J. Ammann
A novel size-reduction technique for a planar monopole type antenna is presented. By rolling the planar element of this antenna, a low-profile radiator with broad impedance bandwidth is obtained without excessively perturbing its radiation properties. The proposed antenna is capable of covering frequencies in the range 3.1 GHz to 15 GHz. The antenna yields a high gain with high radiation efficiency across the full bandwidth. Radiation patterns show good omnidirectional features, so it is a remarkable candidate for in-door or vehicular applications where large frequency range is required
{"title":"Low-Profile Rolled Planar Antenna with Wide Bandwidth","authors":"G. Ruvio, Max J. Ammann","doi":"10.1109/IWAT.2007.370084","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370084","url":null,"abstract":"A novel size-reduction technique for a planar monopole type antenna is presented. By rolling the planar element of this antenna, a low-profile radiator with broad impedance bandwidth is obtained without excessively perturbing its radiation properties. The proposed antenna is capable of covering frequencies in the range 3.1 GHz to 15 GHz. The antenna yields a high gain with high radiation efficiency across the full bandwidth. Radiation patterns show good omnidirectional features, so it is a remarkable candidate for in-door or vehicular applications where large frequency range is required","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116538993","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370093
D. Tsamakis, Z. Wu
This paper presents the study of two dielectric loaded planar antenna structures suitable for ultra wideband (UWB) or dual-band applications. The effect of the dielectric loading on the antenna resonant frequency and impedance bandwidth is investigated. Simulation and measured results for the return loss are presented and compared. The radiation patterns of the optimum design are also presented and discussed.
{"title":"Dielectric Loaded Planar Antennas for Ultra Wideband and Dual-Band Applications","authors":"D. Tsamakis, Z. Wu","doi":"10.1109/IWAT.2007.370093","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370093","url":null,"abstract":"This paper presents the study of two dielectric loaded planar antenna structures suitable for ultra wideband (UWB) or dual-band applications. The effect of the dielectric loading on the antenna resonant frequency and impedance bandwidth is investigated. Simulation and measured results for the return loss are presented and compared. The radiation patterns of the optimum design are also presented and discussed.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116800586","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370118
T. Kokkinos, A. Feresidis, J. Vardaxoglou
Double spiral resonators, properly backed on grounded substrates and specifically arranged in periodic arrays, support backward waves at their fundamental resonance. Transmission lines that are composed of these spirals and their potential use in microwave applications are studied in this paper. Subsequently to a periodic, full-wave analysis of the double spiral resonators, the fabrication and measurement of the spiral-based transmission lines experimentally validate that they support backward waves over a fractional bandwidth of approximately 13%. For the in depth analysis of these lines, an equivalent circuit, that can describe all the phenomena associated with the operation of the double spirals as structural unit cells of metamaterials, is extracted. Finally, an ultra compact diplexer that originates its operation on spiral-based transmission lines is presented, exhibiting just one of the possible ways that metamaterial lines can be employed in microwave applications
{"title":"Analysis and Application of Metamaterial Spiral-Based Transmission Lines","authors":"T. Kokkinos, A. Feresidis, J. Vardaxoglou","doi":"10.1109/IWAT.2007.370118","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370118","url":null,"abstract":"Double spiral resonators, properly backed on grounded substrates and specifically arranged in periodic arrays, support backward waves at their fundamental resonance. Transmission lines that are composed of these spirals and their potential use in microwave applications are studied in this paper. Subsequently to a periodic, full-wave analysis of the double spiral resonators, the fabrication and measurement of the spiral-based transmission lines experimentally validate that they support backward waves over a fractional bandwidth of approximately 13%. For the in depth analysis of these lines, an equivalent circuit, that can describe all the phenomena associated with the operation of the double spirals as structural unit cells of metamaterials, is extracted. Finally, an ultra compact diplexer that originates its operation on spiral-based transmission lines is presented, exhibiting just one of the possible ways that metamaterial lines can be employed in microwave applications","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123696030","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370151
M. Andersson, C. Orlenius, M. Franzén
The bit rate of new mobile broadband services will be directly affected by the configuration and efficiency of the terminal antennas. Each dB not lost through fading, mismatch and ohmic loss can be used by new (HSDPA and WiMAX) and future (LTE) mobile broadband services for higher user bit rate or use of less spectrum by increasing the modulation rate and/or reducing the coding rate. Fading can be combated using diversity antennas or utilized for higher capacity using partially uncorrelated communication channels created through the use of multiple antennas at both the radio base station and the terminal (MIMO). Low mismatch and low ohmic loss in the antenna and its environment are crucial for high bit rates with terminals using either diversity or MIMO. The only measurement instrument to directly measure the SNR increase of diversity antennas or the increase in capacity of using MIMO antennas is the reverberation chamber. The reverberation chamber simulates a fading environment similar to the one encountered in urban or indoor environments. Measurements in the reverberation chamber are fast and repeatable. The alternative is complex and often unreliable drive tests. Measurements of diversity gain and MIMO capacity in a reverberation chamber are explained and results are presented.
{"title":"Measuring the Impact of Multiple Terminal Antennas on the Bit Rate of Mobile Broadband Systems Using Reverberation Chambers","authors":"M. Andersson, C. Orlenius, M. Franzén","doi":"10.1109/IWAT.2007.370151","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370151","url":null,"abstract":"The bit rate of new mobile broadband services will be directly affected by the configuration and efficiency of the terminal antennas. Each dB not lost through fading, mismatch and ohmic loss can be used by new (HSDPA and WiMAX) and future (LTE) mobile broadband services for higher user bit rate or use of less spectrum by increasing the modulation rate and/or reducing the coding rate. Fading can be combated using diversity antennas or utilized for higher capacity using partially uncorrelated communication channels created through the use of multiple antennas at both the radio base station and the terminal (MIMO). Low mismatch and low ohmic loss in the antenna and its environment are crucial for high bit rates with terminals using either diversity or MIMO. The only measurement instrument to directly measure the SNR increase of diversity antennas or the increase in capacity of using MIMO antennas is the reverberation chamber. The reverberation chamber simulates a fading environment similar to the one encountered in urban or indoor environments. Measurements in the reverberation chamber are fast and repeatable. The alternative is complex and often unreliable drive tests. Measurements of diversity gain and MIMO capacity in a reverberation chamber are explained and results are presented.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128856555","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370075
Wei Zhang, P. Hall
Nowadays, using EBG as antenna ground plane is well known in the antenna community. But most applications are limited to narrowband antennas. A broadband antenna mounted on an EBG structure has been investigated recently in the University of Birmingham. It performs well over 4.8 to 6.8 GHz with return loss lower than -10 dB, gain greater than 6 dB and good radiation pattern. In this paper, this research has been carried on. Two broadband diamond dipole antennas are mounted above the same EBG structure in H-plane and E-plane directions with different distances between them. The variation of mutual coupling (S21) between two dipoles caused by distance change and EBG structure utilization is investigated over 4 to 13 GHz frequency range and mutual coupling comparisons between antennas with and without EBG structure has been performed over 4.8 to 6.8 GHz frequency range.
{"title":"Mutual coupling investigation of two wideband dipole antennas on EBG ground plane","authors":"Wei Zhang, P. Hall","doi":"10.1109/IWAT.2007.370075","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370075","url":null,"abstract":"Nowadays, using EBG as antenna ground plane is well known in the antenna community. But most applications are limited to narrowband antennas. A broadband antenna mounted on an EBG structure has been investigated recently in the University of Birmingham. It performs well over 4.8 to 6.8 GHz with return loss lower than -10 dB, gain greater than 6 dB and good radiation pattern. In this paper, this research has been carried on. Two broadband diamond dipole antennas are mounted above the same EBG structure in H-plane and E-plane directions with different distances between them. The variation of mutual coupling (S21) between two dipoles caused by distance change and EBG structure utilization is investigated over 4 to 13 GHz frequency range and mutual coupling comparisons between antennas with and without EBG structure has been performed over 4.8 to 6.8 GHz frequency range.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129855396","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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