Pub Date : 2013-03-04DOI: 10.1109/IWAT.2013.6518329
Yijun Feng, Shuai Xiong, Bo O. Zhu, Junming Zhao, T. Jiang
Reflectors are common structures utilized in antenna system to obtain specific directive radiation or to enhance antenna gain. It is quite desirable to construct reflectors with planar or low-profile features in many applications. In this paper, we present the design of two kinds of low-profile planar electromagnetic wave reflectors based on the transformation optics. By employing simple linear coordinate transformations, either a retrodirective reflector or a parabolic reflector can be achieved on planar conducting sheet with dielectric cover composed of homogeneous birefringent dielectric media, which reduces the complexity of practical realization. Such simple designs allow us to further realize the reflectors by alternative layers of normal dielectrics based on the effective medium theory. The practical realizations at microwave regime have been validated by full wave electromagnetic simulation, which also demonstrate broadband performance.
{"title":"Design and realization of planar reflectors through transformation optics","authors":"Yijun Feng, Shuai Xiong, Bo O. Zhu, Junming Zhao, T. Jiang","doi":"10.1109/IWAT.2013.6518329","DOIUrl":"https://doi.org/10.1109/IWAT.2013.6518329","url":null,"abstract":"Reflectors are common structures utilized in antenna system to obtain specific directive radiation or to enhance antenna gain. It is quite desirable to construct reflectors with planar or low-profile features in many applications. In this paper, we present the design of two kinds of low-profile planar electromagnetic wave reflectors based on the transformation optics. By employing simple linear coordinate transformations, either a retrodirective reflector or a parabolic reflector can be achieved on planar conducting sheet with dielectric cover composed of homogeneous birefringent dielectric media, which reduces the complexity of practical realization. Such simple designs allow us to further realize the reflectors by alternative layers of normal dielectrics based on the effective medium theory. The practical realizations at microwave regime have been validated by full wave electromagnetic simulation, which also demonstrate broadband performance.","PeriodicalId":247542,"journal":{"name":"2013 International Workshop on Antenna Technology (iWAT)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133091387","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 : 2013-03-04DOI: 10.1109/IWAT.2013.6518310
E. Soliman, M. Sallam, G. Vandenbosch
A novel wire-grid array of nanorods is introduced for the first time in this paper. The array consists of five gold radiating rods and four gold perpendicular connecting rods. Via optimizing the lengths of the radiators and connectors, high value of directivity has been obtained. The new array is designed for operation at a wavelength of 1.55 μm, which is commonly used by optical communication system. The overall physical and electrical sizes of the array are (0.68 μm -by- 1.05 μm) and (3λg/2 -by- λg), respectively, with a maximum directivity of 9.25 dBi. The new array is analyzed using a commercial full-wave finite-difference time-domain package. It provides symmetric radiation pattern with reasonable side-lobe-level and extremely low cross-polarization level.
{"title":"Novel wire-grid nantenna array for optical communication systems","authors":"E. Soliman, M. Sallam, G. Vandenbosch","doi":"10.1109/IWAT.2013.6518310","DOIUrl":"https://doi.org/10.1109/IWAT.2013.6518310","url":null,"abstract":"A novel wire-grid array of nanorods is introduced for the first time in this paper. The array consists of five gold radiating rods and four gold perpendicular connecting rods. Via optimizing the lengths of the radiators and connectors, high value of directivity has been obtained. The new array is designed for operation at a wavelength of 1.55 μm, which is commonly used by optical communication system. The overall physical and electrical sizes of the array are (0.68 μm -by- 1.05 μm) and (3λg/2 -by- λg), respectively, with a maximum directivity of 9.25 dBi. The new array is analyzed using a commercial full-wave finite-difference time-domain package. It provides symmetric radiation pattern with reasonable side-lobe-level and extremely low cross-polarization level.","PeriodicalId":247542,"journal":{"name":"2013 International Workshop on Antenna Technology (iWAT)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133540413","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 : 2013-03-04DOI: 10.1109/IWAT.2013.6518319
X. Yang, L. Liu, S. Cheung, Y. Y. Sun
This paper presents the results of a simple ultrawideband (UWB) monopole antenna having an impedance bandwidth from 3.1-40 GHz. The antenna has a half-elliptical shaped radiator with microstrip-fed and a total size of 24×30×0.762 mm3. The extremely wideband characteristic of the antenna is achieved by simply using a tapered transformer and a small square slot on the ground plane.
{"title":"A simple UWB monopole antenna using half-elliptical radiator","authors":"X. Yang, L. Liu, S. Cheung, Y. Y. Sun","doi":"10.1109/IWAT.2013.6518319","DOIUrl":"https://doi.org/10.1109/IWAT.2013.6518319","url":null,"abstract":"This paper presents the results of a simple ultrawideband (UWB) monopole antenna having an impedance bandwidth from 3.1-40 GHz. The antenna has a half-elliptical shaped radiator with microstrip-fed and a total size of 24×30×0.762 mm3. The extremely wideband characteristic of the antenna is achieved by simply using a tapered transformer and a small square slot on the ground plane.","PeriodicalId":247542,"journal":{"name":"2013 International Workshop on Antenna Technology (iWAT)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126171317","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 : 2013-03-04DOI: 10.1109/IWAT.2013.6518301
S. Ta, H. Choo, I. Park
A dual-band printed dipole antenna with wide-beamwidth radiation patterns is introduced for 2.4/5 GHz bands wireless local area network access points. A printed dipole is designed at the center of circular ground plane and fed by a novel integrated balun consisting of a curved microstrip-line and a circular slot to allow broadband operation. An angled dipole and two vertical copper plates on the ground plane are used to achieve wide beamwidth in lower and upper bands, respectively. The proposed antenna has an impedance bandwidth of 2.395 - 2.50 GHz and 5.07 - 5.96 GHz for the -10 dB reflection coefficient. At 2.45 GHz, the antenna has gain of 6.86 dBi, front-to-back ratio of 21 dB, and half-power beam-width of 104° and 102° in the E- and H-planes, respectively. At 5.5 GHz, the antenna has gain of 6.92 dBi, front-to-back ratio of 27 dB, and half-power beam-width of 118° and 114° in E- and Hplanes, respectively.
{"title":"A dual-band wide-beamwidth WLAN access point antenna","authors":"S. Ta, H. Choo, I. Park","doi":"10.1109/IWAT.2013.6518301","DOIUrl":"https://doi.org/10.1109/IWAT.2013.6518301","url":null,"abstract":"A dual-band printed dipole antenna with wide-beamwidth radiation patterns is introduced for 2.4/5 GHz bands wireless local area network access points. A printed dipole is designed at the center of circular ground plane and fed by a novel integrated balun consisting of a curved microstrip-line and a circular slot to allow broadband operation. An angled dipole and two vertical copper plates on the ground plane are used to achieve wide beamwidth in lower and upper bands, respectively. The proposed antenna has an impedance bandwidth of 2.395 - 2.50 GHz and 5.07 - 5.96 GHz for the -10 dB reflection coefficient. At 2.45 GHz, the antenna has gain of 6.86 dBi, front-to-back ratio of 21 dB, and half-power beam-width of 104° and 102° in the E- and H-planes, respectively. At 5.5 GHz, the antenna has gain of 6.92 dBi, front-to-back ratio of 27 dB, and half-power beam-width of 118° and 114° in E- and Hplanes, respectively.","PeriodicalId":247542,"journal":{"name":"2013 International Workshop on Antenna Technology (iWAT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129504801","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 : 2013-03-04DOI: 10.1109/IWAT.2013.6518337
R. Tamas, D. Deacu, G. Caruntu, T. Petrescu
Antenna gain is generally measured either in an anechoic chamber or in an open test site. In this paper, we propose an indoor measuring technique based on averaging the magnitude of a normalized transfer function over a distance range. The effects of reflection and diffraction on the mean normalized transfer function are firstly investigated, prior to find the impact of the distance range on the measuring error. The method is then validated by measuring a low-gain, quasi non-directional antenna.
{"title":"An indoor measuring technique for antenna gain","authors":"R. Tamas, D. Deacu, G. Caruntu, T. Petrescu","doi":"10.1109/IWAT.2013.6518337","DOIUrl":"https://doi.org/10.1109/IWAT.2013.6518337","url":null,"abstract":"Antenna gain is generally measured either in an anechoic chamber or in an open test site. In this paper, we propose an indoor measuring technique based on averaging the magnitude of a normalized transfer function over a distance range. The effects of reflection and diffraction on the mean normalized transfer function are firstly investigated, prior to find the impact of the distance range on the measuring error. The method is then validated by measuring a low-gain, quasi non-directional antenna.","PeriodicalId":247542,"journal":{"name":"2013 International Workshop on Antenna Technology (iWAT)","volume":"150 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115598512","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 : 2013-03-04DOI: 10.1109/IWAT.2013.6518328
W. Whittow, C. C. Njoku, Y. Vardaxoglou
This paper reviews some of the latest advances in the field of artificial dielectrics. The dielectric properties (permittivity and losses) can be designed and synthesized by placing small scale inclusions in a host medium. This work will create many new opportunities for antenna designers and will also lead to applications in transformation optics. This paper highlights the progress made in understanding the analytical, practical and measurement aspects of this work.
{"title":"Review of artificial dielectrics containing small scale inclusions","authors":"W. Whittow, C. C. Njoku, Y. Vardaxoglou","doi":"10.1109/IWAT.2013.6518328","DOIUrl":"https://doi.org/10.1109/IWAT.2013.6518328","url":null,"abstract":"This paper reviews some of the latest advances in the field of artificial dielectrics. The dielectric properties (permittivity and losses) can be designed and synthesized by placing small scale inclusions in a host medium. This work will create many new opportunities for antenna designers and will also lead to applications in transformation optics. This paper highlights the progress made in understanding the analytical, practical and measurement aspects of this work.","PeriodicalId":247542,"journal":{"name":"2013 International Workshop on Antenna Technology (iWAT)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126884509","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 : 2013-03-04DOI: 10.1109/IWAT.2013.6518314
Y. Sun, Y. Ding, Y. Zhang
In this paper, we report a traditional Fabry-Pérot resonator antenna, which consists of a frequency selective surface (FSS) as the cover, a rectangle patch as the radiator, and an electric conductor as the reflecting plate. The total dimensions of the antenna sample are 90 mm×90 mm×20 mm. Measurements show that this antenna feature the high gain, low side-lobe-level (SLL), high ratio of front-to-back radiation, and relative low profile in structure.
{"title":"High-gain Fabry-Pérot resonator antenna","authors":"Y. Sun, Y. Ding, Y. Zhang","doi":"10.1109/IWAT.2013.6518314","DOIUrl":"https://doi.org/10.1109/IWAT.2013.6518314","url":null,"abstract":"In this paper, we report a traditional Fabry-Pérot resonator antenna, which consists of a frequency selective surface (FSS) as the cover, a rectangle patch as the radiator, and an electric conductor as the reflecting plate. The total dimensions of the antenna sample are 90 mm×90 mm×20 mm. Measurements show that this antenna feature the high gain, low side-lobe-level (SLL), high ratio of front-to-back radiation, and relative low profile in structure.","PeriodicalId":247542,"journal":{"name":"2013 International Workshop on Antenna Technology (iWAT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126577937","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 : 2013-03-04DOI: 10.1109/IWAT.2013.6518304
R. Hahnel, W. Benedix, D. Plettemeier
A low cost, novel antenna design based on a Vivaldi structure for the 60 GHz band is presented. The antenna concept may be manufactured on a multilayer PCB but is still compact. It provides both a wide band matching as well as a high realized gain (>7 dBi) at 50 Ohm input impedance. Though based on the Vivaldi structure the main beam directs vertically with respect to the printed circuit board. The proposed antenna design is also suitable for an InPackage technology. Here we present two concepts with microstrip feed and stripline feed.
{"title":"Broadside radiating vivaldi antenna for the 60 GHz band","authors":"R. Hahnel, W. Benedix, D. Plettemeier","doi":"10.1109/IWAT.2013.6518304","DOIUrl":"https://doi.org/10.1109/IWAT.2013.6518304","url":null,"abstract":"A low cost, novel antenna design based on a Vivaldi structure for the 60 GHz band is presented. The antenna concept may be manufactured on a multilayer PCB but is still compact. It provides both a wide band matching as well as a high realized gain (>7 dBi) at 50 Ohm input impedance. Though based on the Vivaldi structure the main beam directs vertically with respect to the printed circuit board. The proposed antenna design is also suitable for an InPackage technology. Here we present two concepts with microstrip feed and stripline feed.","PeriodicalId":247542,"journal":{"name":"2013 International Workshop on Antenna Technology (iWAT)","volume":"8 24","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114047389","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 : 2013-03-04DOI: 10.1109/IWAT.2013.6518360
A. Hussain, P. Kildal, A. Al-Rawi, J. Yang
The paper studies the performance of a novel ultra-wideband multiport self-grounded bow-tie antenna and presents simulated embedded radiation efficiencies and correlation at each antenna port, and the diversity gain of the antenna in rich isotropic multipath environment.
{"title":"Efficiency, correlation, and diversity gain of UWB multiport self-grounded bow-tie antenna in rich isotropic multipath environment","authors":"A. Hussain, P. Kildal, A. Al-Rawi, J. Yang","doi":"10.1109/IWAT.2013.6518360","DOIUrl":"https://doi.org/10.1109/IWAT.2013.6518360","url":null,"abstract":"The paper studies the performance of a novel ultra-wideband multiport self-grounded bow-tie antenna and presents simulated embedded radiation efficiencies and correlation at each antenna port, and the diversity gain of the antenna in rich isotropic multipath environment.","PeriodicalId":247542,"journal":{"name":"2013 International Workshop on Antenna Technology (iWAT)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114804128","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 : 2013-03-04DOI: 10.1109/IWAT.2013.6518308
T. Nguyen, Haewook Han, I. Park
An antenna design to increase the directivity of a terahertz (THz) photomixer used as a THz source is presented. The antenna is consisted of a full-wavelength dipole on a GaAs membrane substrate and covered by a frequency-selective surface (FSS). The perfect mirror of ground plane and the partially reflective mirror of FSS form a resonator which produces good transmission characteristics and thus significantly improving the antenna directivity. The cavity in the GaAs membrane substrate has been found to be an important parameter to achieve expected high directivity characteristic when having sufficient large size. We show the antenna geometry, optimization process and the final simulated results of the proposed antenna.
{"title":"Frequency selective surface for directivity enhancement of a terahertz photomixer antenna","authors":"T. Nguyen, Haewook Han, I. Park","doi":"10.1109/IWAT.2013.6518308","DOIUrl":"https://doi.org/10.1109/IWAT.2013.6518308","url":null,"abstract":"An antenna design to increase the directivity of a terahertz (THz) photomixer used as a THz source is presented. The antenna is consisted of a full-wavelength dipole on a GaAs membrane substrate and covered by a frequency-selective surface (FSS). The perfect mirror of ground plane and the partially reflective mirror of FSS form a resonator which produces good transmission characteristics and thus significantly improving the antenna directivity. The cavity in the GaAs membrane substrate has been found to be an important parameter to achieve expected high directivity characteristic when having sufficient large size. We show the antenna geometry, optimization process and the final simulated results of the proposed antenna.","PeriodicalId":247542,"journal":{"name":"2013 International Workshop on Antenna Technology (iWAT)","volume":"35 11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116652242","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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