Pub Date : 2010-03-01DOI: 10.1109/IWAT.2010.5464683
M. Silveirinha, C. Fernandes, Jorge R. Costa, C. Medeiros
In a recent work [M. G. Silveirinha, C. A. Fernandes, J. R. Costa, Phys. Rev. B, 78, 195121, 2008], we have theoretically demonstrated that a micro-structured material formed by a very dense array of crossed wires can be used to enhance the near-field and achieve subwavelength imaging. Here, we describe our ongoing work in this topic, and discuss the physical principles and the salient features of the imaging mechanism.
在最近的一部作品中[M]。G. Silveirinha, C. A. Fernandes, J. R. Costa, Phys。Rev. B, 78, 195121, 2008]，我们已经从理论上证明了由非常密集的交叉导线阵列形成的微结构材料可以用来增强近场并实现亚波长成像。在这里，我们描述了我们正在进行的工作，并讨论了成像机制的物理原理和显著特征。
{"title":"Broadband superlensing using a metamaterial with an extreme index of refraction: Salient features, physical principles and analytical modeling","authors":"M. Silveirinha, C. Fernandes, Jorge R. Costa, C. Medeiros","doi":"10.1109/IWAT.2010.5464683","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464683","url":null,"abstract":"In a recent work [M. G. Silveirinha, C. A. Fernandes, J. R. Costa, Phys. Rev. B, 78, 195121, 2008], we have theoretically demonstrated that a micro-structured material formed by a very dense array of crossed wires can be used to enhance the near-field and achieve subwavelength imaging. Here, we describe our ongoing work in this topic, and discuss the physical principles and the salient features of the imaging mechanism.","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":"125869977","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.2010.5464921
F. Chiadini, V. Fiumara, I. Gallina, A. Scaglione
Analysis of the reflecting features of Cantor dielectric multilayers for oblique incidence shows that, for suitable values of the refractive indexes of the two constituent materials, they behave as an omnidirectional mirror. The Cantor multilayer still keeps the characteristics of omnidirectional mirror also for lossy materials. The main effect of the material dissipation is to increase the minimum value of the dips delimiting the reflecting band and, consequently, to broaden the rejected frequency band. Comparison with a periodic quarter-wave stack having the same constituent materials points out that the Cantor multilayer has an higher rejection level with a narrower bandgap.
{"title":"The Cantor dielectric fractal multilayer as an omnidirectional mirror","authors":"F. Chiadini, V. Fiumara, I. Gallina, A. Scaglione","doi":"10.1109/IWAT.2010.5464921","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464921","url":null,"abstract":"Analysis of the reflecting features of Cantor dielectric multilayers for oblique incidence shows that, for suitable values of the refractive indexes of the two constituent materials, they behave as an omnidirectional mirror. The Cantor multilayer still keeps the characteristics of omnidirectional mirror also for lossy materials. The main effect of the material dissipation is to increase the minimum value of the dips delimiting the reflecting band and, consequently, to broaden the rejected frequency band. Comparison with a periodic quarter-wave stack having the same constituent materials points out that the Cantor multilayer has an higher rejection level with a narrower bandgap.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"22 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":"126257141","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.2010.5464870
Huan-Chu Huang, Jen-Chen Lu, P. Hsu
A simple planar Yagi-Uda antenna with a single director and a concave parabolic reflector on a thin dielectric substrate is proposed. Through the innovative design, the simple Yagi-Uda antenna can achieve the high directivity of 9.0 dBi, front-to-back ratio of 14.5 dB, cross-polarization level of −38.7 dB, bandwidth of 6.0%, and the radiation efficiency of 85.1%, i.e., better than −1 dBi in terms of the 3D average gain. This proposed antenna is especially suitable for the mobile devices with GPS functions.
{"title":"A simple planar high-directivity Yagi-Uda antenna with a concave parabolic reflector","authors":"Huan-Chu Huang, Jen-Chen Lu, P. Hsu","doi":"10.1109/IWAT.2010.5464870","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464870","url":null,"abstract":"A simple planar Yagi-Uda antenna with a single director and a concave parabolic reflector on a thin dielectric substrate is proposed. Through the innovative design, the simple Yagi-Uda antenna can achieve the high directivity of 9.0 dBi, front-to-back ratio of 14.5 dB, cross-polarization level of −38.7 dB, bandwidth of 6.0%, and the radiation efficiency of 85.1%, i.e., better than −1 dBi in terms of the 3D average gain. This proposed antenna is especially suitable for the mobile devices with GPS functions.","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":"126458442","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.2010.5464756
M. Shabani, M. Akbari
Next generation wideband and ultra-wideband radar antenna arrays need efficient true-time delay networks for array control. Following the great interest for optical control of antenna array beam steering, performance analysis of optical beam-formers is a must. In this paper signal to noise ratio and dynamic range of simple optical beam-forming structures with components off the shelf are investigated theoretically. Especially the effects of certain power combining components such as arrayed wave guide gratings, broadband passive optical combiners and microwave combiners inspected. It turns up that an efficient microwave combiner would surpass the optical combiners in both SNR and dynamic range.
{"title":"An Investigation on the performance of receiving Optical Beam-Forming Networks","authors":"M. Shabani, M. Akbari","doi":"10.1109/IWAT.2010.5464756","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464756","url":null,"abstract":"Next generation wideband and ultra-wideband radar antenna arrays need efficient true-time delay networks for array control. Following the great interest for optical control of antenna array beam steering, performance analysis of optical beam-formers is a must. In this paper signal to noise ratio and dynamic range of simple optical beam-forming structures with components off the shelf are investigated theoretically. Especially the effects of certain power combining components such as arrayed wave guide gratings, broadband passive optical combiners and microwave combiners inspected. It turns up that an efficient microwave combiner would surpass the optical combiners in both SNR and dynamic range.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"6 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":"131395864","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.2010.5464693
Takumi Hiraoka, K. Saito, Masaharu Takahashi, K. Ito
Recently, mobile phones have been downsized increasingly and the antenna is embedded inside. In general, the characteristics of the antenna are influenced by a body of user. The influence of the hand on mobile phone is considered to be very important in designing the antenna. So far, the influence of the hand on the antenna has been investigated by use of a hand phantom, which has same electrical properties as the body and a particular shape. In this study, the authors have developed a hand phantom which can change its shape arbitrarily. Moreover, the S-parameter of the antenna gripped by the developed hand phantom was measured to show the effectiveness of the developed hand phantom.
{"title":"Development on flexible hand phantom and its application to impedance measurement of antenna for mobile radio terminal","authors":"Takumi Hiraoka, K. Saito, Masaharu Takahashi, K. Ito","doi":"10.1109/IWAT.2010.5464693","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464693","url":null,"abstract":"Recently, mobile phones have been downsized increasingly and the antenna is embedded inside. In general, the characteristics of the antenna are influenced by a body of user. The influence of the hand on mobile phone is considered to be very important in designing the antenna. So far, the influence of the hand on the antenna has been investigated by use of a hand phantom, which has same electrical properties as the body and a particular shape. In this study, the authors have developed a hand phantom which can change its shape arbitrarily. Moreover, the S-parameter of the antenna gripped by the developed hand phantom was measured to show the effectiveness of the developed hand phantom.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"16 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":"132042468","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.2010.5464638
A. Yamada, H. Arai, S. Sekine, M. Higaki, S. Obayashi, H. Shoki
It is required to work in various surrounding environments in order that the small antennas used for mobile terminal and RFID tag are located in the vicinity of various objects including the human body and the metal. H-shaped antenna has been proposed to obtain the characteristics not to be changed by circumference environment. The H-shaped antenna has been designed by adjusting offset position and the ratio between the lengths of parallel elements. As a result of examination about the antenna height (h), the shift of input impedance near the metal was the smallest when h=0.04ε.
{"title":"Radiation mechanism of H-shaped antenna using parallel resonance mode","authors":"A. Yamada, H. Arai, S. Sekine, M. Higaki, S. Obayashi, H. Shoki","doi":"10.1109/IWAT.2010.5464638","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464638","url":null,"abstract":"It is required to work in various surrounding environments in order that the small antennas used for mobile terminal and RFID tag are located in the vicinity of various objects including the human body and the metal. H-shaped antenna has been proposed to obtain the characteristics not to be changed by circumference environment. The H-shaped antenna has been designed by adjusting offset position and the ratio between the lengths of parallel elements. As a result of examination about the antenna height (h), the shift of input impedance near the metal was the smallest when h=0.04ε.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"28 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":"134294129","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.2010.5464875
L. Huitema, M. Koubeissi, C. Decroze, T. Monediere
A novel design of compact dielectric resonator antenna (DRA) dedicated to ultra wideband applications such as Digital Video Broadcasting-Handheld (DVB-H) is presented in this paper. A miniaturization technique has been performed in order to reduce the antenna size. The obtained dimensions of the final design of the DRA are λ0/7 × λ0/13 × λ0/28 at 466MHz. Also, measurements are presented to validate the results obtained via simulation. The proposed antenna offers a bandwidth of 70% around 700MHz for −8dB impedance bandwidth definition and covers the Ultra High Frequency (UHF) IV, V and Global System for Mobile communications (GSM) bands. Finally a DRA using magneto-dielectric materials is presented and its performances are shown.
{"title":"Handheld dielectric resonator antenna for ultra wideband applications","authors":"L. Huitema, M. Koubeissi, C. Decroze, T. Monediere","doi":"10.1109/IWAT.2010.5464875","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464875","url":null,"abstract":"A novel design of compact dielectric resonator antenna (DRA) dedicated to ultra wideband applications such as Digital Video Broadcasting-Handheld (DVB-H) is presented in this paper. A miniaturization technique has been performed in order to reduce the antenna size. The obtained dimensions of the final design of the DRA are λ0/7 × λ0/13 × λ0/28 at 466MHz. Also, measurements are presented to validate the results obtained via simulation. The proposed antenna offers a bandwidth of 70% around 700MHz for −8dB impedance bandwidth definition and covers the Ultra High Frequency (UHF) IV, V and Global System for Mobile communications (GSM) bands. Finally a DRA using magneto-dielectric materials is presented and its performances are shown.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"52 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":"134432468","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.2010.5464643
Robson H C Manioba, Adaildo G d'Assunao, A. Campos
Design and experimental investigations are presented for a cascaded frequency selective surface (FSS) with perfectly conducting Koch fractal patch elements. The work was developed in two steps. In the first step two Koch fractal FSS screens were designed using the software Ansoft Design¿ and several prototypes were built. In the second step these FSS screens were cascaded and separated by an air gap layer to improve the bandwidth behaviour. The structures are cascaded using Teflon spacers and screws to obtain the air gap. The FSSs were built on a RT-Duroid 3010 substrate. Good agreement was observed between simulated and measured results.
{"title":"Improving stop-band properties of frequency selective surfaces with Koch fractal elements","authors":"Robson H C Manioba, Adaildo G d'Assunao, A. Campos","doi":"10.1109/IWAT.2010.5464643","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464643","url":null,"abstract":"Design and experimental investigations are presented for a cascaded frequency selective surface (FSS) with perfectly conducting Koch fractal patch elements. The work was developed in two steps. In the first step two Koch fractal FSS screens were designed using the software Ansoft Design¿ and several prototypes were built. In the second step these FSS screens were cascaded and separated by an air gap layer to improve the bandwidth behaviour. The structures are cascaded using Teflon spacers and screws to obtain the air gap. The FSSs were built on a RT-Duroid 3010 substrate. Good agreement was observed between simulated and measured results.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"114 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":"133696565","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.2010.5464872
A. Rathore, R. Nilavalan, H. Abutarboush, T. Peter
A compact and optimized design of a rectangular printed monopole antenna with slits and truncated ground plane on FR-4 substrate is presented. The proposed antenna is designed for dual-band operation at 2.4 GHz and 5.2 GHz for Wireless Local Area Network (WLAN) applications with S11≪ −10 dB. This antenna has good return loss and radiation characteristics in required frequency band. The proposed antenna gives omni-directional radiation pattern in the E Plane and H plane over the frequency range of 2.4 GHz and 5.2 GHz. The calculated and measured results in terms of return loss show good agreement and the results also show good wideband characteristics.
{"title":"Compact dual-band (2.4/5.2GHz) monopole antenna for WLAN applications","authors":"A. Rathore, R. Nilavalan, H. Abutarboush, T. Peter","doi":"10.1109/IWAT.2010.5464872","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464872","url":null,"abstract":"A compact and optimized design of a rectangular printed monopole antenna with slits and truncated ground plane on FR-4 substrate is presented. The proposed antenna is designed for dual-band operation at 2.4 GHz and 5.2 GHz for Wireless Local Area Network (WLAN) applications with S11≪ −10 dB. This antenna has good return loss and radiation characteristics in required frequency band. The proposed antenna gives omni-directional radiation pattern in the E Plane and H plane over the frequency range of 2.4 GHz and 5.2 GHz. The calculated and measured results in terms of return loss show good agreement and the results also show good wideband characteristics.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"13 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":"114034692","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.2010.5464686
B. Wu, K. Luk
A wideband four-port integrated antenna that is capable of exciting four different radiation patterns is presented. The antenna designated as the magneto-electric multipole consists of four dual-polarized magneto-electric dipoles arranged in a 2 by 2 array configuration above a ground plane. A two layer matching network is used to combine the signals from the four dual-polarized dipoles to produce two orthogonal broadside modes and two orthogonal conical modes. The performance of the proposed antenna is studied computationally. It can achieve about 27.2% overlapped bandwidth with the centre frequency of 3.9GHz. The isolation between any two ports is greater than 15dB. The two orthogonal broadside modes exhibit about 12 dBi average gain. While for the two orthogonal conical modes, an average gain of 7 dBi can be achieved. The measured radiation patterns of the four degenerate modes are stable within the operating band.
{"title":"“The magneto-electric multipole antenna - a new wideband antenna with pattern and polarization diversity”","authors":"B. Wu, K. Luk","doi":"10.1109/IWAT.2010.5464686","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464686","url":null,"abstract":"A wideband four-port integrated antenna that is capable of exciting four different radiation patterns is presented. The antenna designated as the magneto-electric multipole consists of four dual-polarized magneto-electric dipoles arranged in a 2 by 2 array configuration above a ground plane. A two layer matching network is used to combine the signals from the four dual-polarized dipoles to produce two orthogonal broadside modes and two orthogonal conical modes. The performance of the proposed antenna is studied computationally. It can achieve about 27.2% overlapped bandwidth with the centre frequency of 3.9GHz. The isolation between any two ports is greater than 15dB. The two orthogonal broadside modes exhibit about 12 dBi average gain. While for the two orthogonal conical modes, an average gain of 7 dBi can be achieved. The measured radiation patterns of the four degenerate modes are stable within the operating band.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"240 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":"123882452","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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