Pub Date : 2010-03-01DOI: 10.1109/IWAT.2010.5464751
S. Podilchak, A. Freundorfer, Y. Antar
Planar antenna designs that utilize surface waves (SWs) for leaky wave (LW) excitation are investigated for millimeter wave frequencies of operation. Surface-wave launchers (SWLs) are employed as the antenna source generating cylindrical SWs for bound propagation on a grounded dielectric slab (GDS). By the addition of a segmented circular strip grating configuration, a partially reflecting surface (PRS) can be realized, providing suitable conditions for 2-D leaky-wave radiation. Directive pencil beam patterns at broadside, with gain values greater than 12 dBi at 19.5 GHz, can be achieved.
{"title":"Segmented circular strip planar leaky-wave antenna designs for broadside radiation and one-sided beam scanning","authors":"S. Podilchak, A. Freundorfer, Y. Antar","doi":"10.1109/IWAT.2010.5464751","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464751","url":null,"abstract":"Planar antenna designs that utilize surface waves (SWs) for leaky wave (LW) excitation are investigated for millimeter wave frequencies of operation. Surface-wave launchers (SWLs) are employed as the antenna source generating cylindrical SWs for bound propagation on a grounded dielectric slab (GDS). By the addition of a segmented circular strip grating configuration, a partially reflecting surface (PRS) can be realized, providing suitable conditions for 2-D leaky-wave radiation. Directive pencil beam patterns at broadside, with gain values greater than 12 dBi at 19.5 GHz, can be achieved.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"7 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":"124916513","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.2010.5464927
P. H. F. da Silva, J. Trindade, A. D’assunção
In this work a reconfigurable Minkowski patch antenna has been designed, fabricated, and measured. The proposed patch antenna has the advantage of low profile, lightweight, and easy fabrication, and is potential for wireless communication applications. Ansoft Designer¿ software aided the regonfigurable multiband antenna design with applications for wireless networks. In particular, a prototype was built with applications for Wi-Fi considering for the IEEE 802.11a standard and WiMAX. Frequency reconfigurability is achieved by means of switches placed on the pre-fractal edges of the proposed antenna. The conducted experimental characterization of the Minkowski patch antenna was done with a vector network analyzer in the range of 100 KHz to 7.0 GHz and showed very promising results.
{"title":"Experimental characterization of a reconfigurable multiband Minkowski patch antenna","authors":"P. H. F. da Silva, J. Trindade, A. D’assunção","doi":"10.1109/IWAT.2010.5464927","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464927","url":null,"abstract":"In this work a reconfigurable Minkowski patch antenna has been designed, fabricated, and measured. The proposed patch antenna has the advantage of low profile, lightweight, and easy fabrication, and is potential for wireless communication applications. Ansoft Designer¿ software aided the regonfigurable multiband antenna design with applications for wireless networks. In particular, a prototype was built with applications for Wi-Fi considering for the IEEE 802.11a standard and WiMAX. Frequency reconfigurability is achieved by means of switches placed on the pre-fractal edges of the proposed antenna. The conducted experimental characterization of the Minkowski patch antenna was done with a vector network analyzer in the range of 100 KHz to 7.0 GHz and showed very promising results.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"21 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":"125756665","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.2010.5464683
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.2010.5464650
M. S. Toubet, R. Chantalat, M. Thevenot, T. Monediere, B. Jecko
In this paper, we present the conception of a LOW-PROFILE and High-Gain EBG Resonator Antenna which is excited by several feeds. The antenna structure has been modelled with CST MICROWAVE STUDIO, an FIT (Finite Integration Technique) based software and meets the requirements of a precise specifications. It has a cut-off frequency of 1.2 GHz and delivers a maximum gain of about 18 dB over a bandwidth of 59%. The size of this antenna is small in accordance with the specifications, as it is 700 mm long and wide for a very low height of 16 mm which is equivalent to ¿/16.
{"title":"Conception of a Low-Profile and High-Gain EBG Resonator Antenna with wide bandwidth","authors":"M. S. Toubet, R. Chantalat, M. Thevenot, T. Monediere, B. Jecko","doi":"10.1109/IWAT.2010.5464650","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464650","url":null,"abstract":"In this paper, we present the conception of a LOW-PROFILE and High-Gain EBG Resonator Antenna which is excited by several feeds. The antenna structure has been modelled with CST MICROWAVE STUDIO, an FIT (Finite Integration Technique) based software and meets the requirements of a precise specifications. It has a cut-off frequency of 1.2 GHz and delivers a maximum gain of about 18 dB over a bandwidth of 59%. The size of this antenna is small in accordance with the specifications, as it is 700 mm long and wide for a very low height of 16 mm which is equivalent to ¿/16.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"92 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":"122534761","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.2010.5464652
D. Rialet, A. Sharaiha, A. Tarot, C. Delaveaud, B. Viala
It is becoming increasingly common to use magnetic substrates in antenna devices. A model of effective permeability is showed in order to analyse the behaviour of magnetic multilayer. From this model, we can see the negative effect of the conductivity to the effective permeability of a multilayer magnetic substrate.
{"title":"Modeling of a multi-layer conductor magnetic substrate on antenna devices","authors":"D. Rialet, A. Sharaiha, A. Tarot, C. Delaveaud, B. Viala","doi":"10.1109/IWAT.2010.5464652","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464652","url":null,"abstract":"It is becoming increasingly common to use magnetic substrates in antenna devices. A model of effective permeability is showed in order to analyse the behaviour of magnetic multilayer. From this model, we can see the negative effect of the conductivity to the effective permeability of a multilayer magnetic substrate.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"14 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":"125770578","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.2010.5464872
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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