Pub Date : 2010-03-01DOI: 10.1109/IWAT.2010.5464764
T. Maruyama, T. Furuno, T. Ohya, Y. Oda, Qiang Chen, K. Sawaya
This paper proposes a novel dual frequency selective reflectarray that can control reflected beams independently at dual frequencies using two different polarizations. The reflectarray improves propagation by controlling the scattered beams to achieve high speed in broadband wireless mobile communication systems at a high frequency. The reflectarray comprises cross-dipole arrays and double square loops. Measurement and analysis results show the effectiveness of the reflectarray.
{"title":"Dual frequency selective reflectarray for propagation improvement","authors":"T. Maruyama, T. Furuno, T. Ohya, Y. Oda, Qiang Chen, K. Sawaya","doi":"10.1109/IWAT.2010.5464764","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464764","url":null,"abstract":"This paper proposes a novel dual frequency selective reflectarray that can control reflected beams independently at dual frequencies using two different polarizations. The reflectarray improves propagation by controlling the scattered beams to achieve high speed in broadband wireless mobile communication systems at a high frequency. The reflectarray comprises cross-dipole arrays and double square loops. Measurement and analysis results show the effectiveness of the reflectarray.","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":"129358401","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.2010.5464688
J. Vicente, A. A. Moreira
This paper reports an electro-textile antenna fed by a thin coaxial cable, based on a monopole like element and a rectangular slot with a triangular transition on a ground plane. The structure resembles a printed slot antenna with two electro-textile layers and common felt used as dielectric. Prototypes were fabricated and measured for an isolated antenna and in the vicinity of a user's limb. The antenna was designed for central frequency 2.45 GHz. A simplified simulation model was used to emulate the effect of the user's limb on the antenna performance. To improve antenna radiation and total efficiency an EBG inspired structure was included in the design. The new structure was numerically simulated and measured in wearing scenario in the vicinity of the human body.
{"title":"Electro-textile printed slot antenna over finite EBG structure","authors":"J. Vicente, A. A. Moreira","doi":"10.1109/IWAT.2010.5464688","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464688","url":null,"abstract":"This paper reports an electro-textile antenna fed by a thin coaxial cable, based on a monopole like element and a rectangular slot with a triangular transition on a ground plane. The structure resembles a printed slot antenna with two electro-textile layers and common felt used as dielectric. Prototypes were fabricated and measured for an isolated antenna and in the vicinity of a user's limb. The antenna was designed for central frequency 2.45 GHz. A simplified simulation model was used to emulate the effect of the user's limb on the antenna performance. To improve antenna radiation and total efficiency an EBG inspired structure was included in the design. The new structure was numerically simulated and measured in wearing scenario in the vicinity of the human body.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"31 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":"115998481","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.2010.5464653
Y. Kawakami, T. Hori, M. Fujimoto, R. Yamaguchi, Keizo Cho
A FSS (Frequency Selective Surface) is composed of metal patches arranged in narrow intervals, and has frequency-band-rejection and frequency-band-pass characteristics. It is known that the FSS with the ground plane has PMC (Perfect Magnetic Conductor) characteristics in a specific frequency band. The surface is referred to as a meta-surface and it can control the phase of the wave which is reflected at the surface. This paper proposes a design method to realize a low-profile meta-surface. In the proposed method, the FSS which has low-pass or high-pass filtering characteristics is utilized. The effects of the filtering characteristics of a FSS on PMC characteristics of a meta-surface are described. Based on the calculated results, it is confirmed that the meta-surface can be obtained by using the FSS. In addition, it is found that the thinner and more wideband meta-surface can be achieved by using the FSS which has low-pass filtering characteristics.
{"title":"Low-profile design of meta-surface by considering filtering characteristics of FSS","authors":"Y. Kawakami, T. Hori, M. Fujimoto, R. Yamaguchi, Keizo Cho","doi":"10.1109/IWAT.2010.5464653","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464653","url":null,"abstract":"A FSS (Frequency Selective Surface) is composed of metal patches arranged in narrow intervals, and has frequency-band-rejection and frequency-band-pass characteristics. It is known that the FSS with the ground plane has PMC (Perfect Magnetic Conductor) characteristics in a specific frequency band. The surface is referred to as a meta-surface and it can control the phase of the wave which is reflected at the surface. This paper proposes a design method to realize a low-profile meta-surface. In the proposed method, the FSS which has low-pass or high-pass filtering characteristics is utilized. The effects of the filtering characteristics of a FSS on PMC characteristics of a meta-surface are described. Based on the calculated results, it is confirmed that the meta-surface can be obtained by using the FSS. In addition, it is found that the thinner and more wideband meta-surface can be achieved by using the FSS which has low-pass filtering characteristics.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"41 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":"117242970","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.2010.5464794
N. Llombart, G. Chattopadhyay, Choonsup Lee
In this contribution we present the design of an integrated micro-lens antenna for THz heterodyne arrays. The antenna geometry consists of a waveguide feed, which can be integrated with Schottky mixers, that excites a silicon lens antenna through a leaky-wave or EBG resonant cavity. This cavity is used to match the waveguide feed with the silicon medium as well as to illuminate the upper part of the lens. Thanks to this illumination, the lens sector can be fabricated with photo-lithographic techniques.
{"title":"Micro-lens antenna for integrated THz arrays","authors":"N. Llombart, G. Chattopadhyay, Choonsup Lee","doi":"10.1109/IWAT.2010.5464794","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464794","url":null,"abstract":"In this contribution we present the design of an integrated micro-lens antenna for THz heterodyne arrays. The antenna geometry consists of a waveguide feed, which can be integrated with Schottky mixers, that excites a silicon lens antenna through a leaky-wave or EBG resonant cavity. This cavity is used to match the waveguide feed with the silicon medium as well as to illuminate the upper part of the lens. Thanks to this illumination, the lens sector can be fabricated with photo-lithographic techniques.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"34 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":"128134635","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.2010.5464862
M. Banozic, J. Bartolić, B. Ivsic, T. Debogovic
In this paper an improved design of a dual band planar folded monopole is proposed. The planar folded monopole has been analyzed theoretically and experimentally. The design was extended to a dual band operation. The proposed monopole is successfully simulated, designed, and measured, showing stable radiation patterns and good matching properties in both frequency bands. The proposed antenna has potential applications in the ceiling mount base stations for indoor communications and wireless positioning including adaptive MIMO systems for mobile terminals.
{"title":"Dual band planar folded monopole","authors":"M. Banozic, J. Bartolić, B. Ivsic, T. Debogovic","doi":"10.1109/IWAT.2010.5464862","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464862","url":null,"abstract":"In this paper an improved design of a dual band planar folded monopole is proposed. The planar folded monopole has been analyzed theoretically and experimentally. The design was extended to a dual band operation. The proposed monopole is successfully simulated, designed, and measured, showing stable radiation patterns and good matching properties in both frequency bands. The proposed antenna has potential applications in the ceiling mount base stations for indoor communications and wireless positioning including adaptive MIMO systems for mobile terminals.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"75 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":"125990216","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.2010.5464976
Jian Liu
In this paper, we describe a single feed multiple-bands internal antenna that is designed for mobile and wireless application. A planar inverted-F antenna (PIFA) is configured as the basic architecture. The multi-band is achieved by integrating a U-shape strip line and an inverted L radiator. The PIFA antenna produces the first resonant frequency at 2GHz band; the U-shaped strip line produces the second resonant frequency at 2.4GHz band; the inverted L radiator the third resonant frequency at 5.8GHz band. The designed antenna is small in size, simple in structure. Bandwidth is 26% at 2GHz with VSWR less than and equal to 2∶1. Bandwidth is about 7% at 5.8GHz with VSWR less than and equal to 2∶1. The designed antenna is band wide enough to support mobile and wireless scenarios of UMTS (3G) band from 1920MHz to 2170MHz; Bluetooth WLAN at 2.4GHz from 2.4GHz to 2.485GHz; and WLAN at 5.8GHz from 5.725GHz to 5.85GHz. The antenna was designed by MWS CST software and was validated by experimental measurement in terms of port parameters. Finally, the impedance characteristic and far-field radiation pattern are listed and illustrated in the paper.
{"title":"A single feed multi-band internal antenna for mobile communication terminals","authors":"Jian Liu","doi":"10.1109/IWAT.2010.5464976","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464976","url":null,"abstract":"In this paper, we describe a single feed multiple-bands internal antenna that is designed for mobile and wireless application. A planar inverted-F antenna (PIFA) is configured as the basic architecture. The multi-band is achieved by integrating a U-shape strip line and an inverted L radiator. The PIFA antenna produces the first resonant frequency at 2GHz band; the U-shaped strip line produces the second resonant frequency at 2.4GHz band; the inverted L radiator the third resonant frequency at 5.8GHz band. The designed antenna is small in size, simple in structure. Bandwidth is 26% at 2GHz with VSWR less than and equal to 2∶1. Bandwidth is about 7% at 5.8GHz with VSWR less than and equal to 2∶1. The designed antenna is band wide enough to support mobile and wireless scenarios of UMTS (3G) band from 1920MHz to 2170MHz; Bluetooth WLAN at 2.4GHz from 2.4GHz to 2.485GHz; and WLAN at 5.8GHz from 5.725GHz to 5.85GHz. The antenna was designed by MWS CST software and was validated by experimental measurement in terms of port parameters. Finally, the impedance characteristic and far-field radiation pattern are listed and illustrated in the paper.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"30 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":"126390641","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.2010.5464690
Arij Farhat, E. Jehamy, M. Ney
The paper investigates the optimization of an electrically large antenna : a shaped dielectric substrate lens at millimeter wave frequencies (76 – 77 GHz). The aim is to determine the best lens profile that complies with arbitrary desired radiation pattern templates. A feed forward artificial neural network (ANN) was implemented in order to predict the radiation pattern of this antenna. Particle Swarm Optimization (PSO) procedure, combined with neural network modeling, is applied in order to minimize the cost function (the fitness function) and to fit specifications. The optimized results are in a good agreement with 3D MoM simulations.
{"title":"Optimization methods for computer-aided design of artificial dielectric lens antennas","authors":"Arij Farhat, E. Jehamy, M. Ney","doi":"10.1109/IWAT.2010.5464690","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464690","url":null,"abstract":"The paper investigates the optimization of an electrically large antenna : a shaped dielectric substrate lens at millimeter wave frequencies (76 – 77 GHz). The aim is to determine the best lens profile that complies with arbitrary desired radiation pattern templates. A feed forward artificial neural network (ANN) was implemented in order to predict the radiation pattern of this antenna. Particle Swarm Optimization (PSO) procedure, combined with neural network modeling, is applied in order to minimize the cost function (the fitness function) and to fit specifications. The optimized results are in a good agreement with 3D MoM simulations.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"57 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":"125067358","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.2010.5464697
Xiaohui Tao, Jun-ping Geng, R. Jin, Xianling Liang, Haobo Wu
A new planar RFID tag antenna is developed, which performs well on metallic objects. Unlike earlier attempts to resist the effect of metal with absorbing and isolating materials, this approach introduces a special structure—“Multi-Layers”, and the newly-invented Adaptive Comprehensive Learning Particle Swarm Optimization (A-CLPSO) is implemented in the process of the antenna design. Moreover, with specially-designed algorithms, both the radiation part and the middle ground part are continuous structure without point contact. The overall size of the optimized antenna is 70*50*4 mm3. The simulated and experiment results are shown, which meet the demand of Chinese RFID standard.
{"title":"RFID tag antenna for use on metal","authors":"Xiaohui Tao, Jun-ping Geng, R. Jin, Xianling Liang, Haobo Wu","doi":"10.1109/IWAT.2010.5464697","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464697","url":null,"abstract":"A new planar RFID tag antenna is developed, which performs well on metallic objects. Unlike earlier attempts to resist the effect of metal with absorbing and isolating materials, this approach introduces a special structure—“Multi-Layers”, and the newly-invented Adaptive Comprehensive Learning Particle Swarm Optimization (A-CLPSO) is implemented in the process of the antenna design. Moreover, with specially-designed algorithms, both the radiation part and the middle ground part are continuous structure without point contact. The overall size of the optimized antenna is 70*50*4 mm3. The simulated and experiment results are shown, which meet the demand of Chinese RFID standard.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"23 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":"122192369","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.2010.5464762
Di Li, Yi Huang, Yao-chun Shen, N. Khiabani
Photoconductive antennas have been widely used to generate and detect THz waves in recent years. Because the thickness of the substrate is usually larger than the wavelength of THz waves, surface/substrate modes may be generated and the effect of the substrate cannot be ignored - this has not been properly investigated. This paper is therefore to investigate this problem using a numerical simulation tool. The radiation pattern and power of photoconductive antennas with different sizes of substrates are obtained. The results show that the radiated power is sensitive to the dimensions of the substrate: most of the radiated power is radiated towards the substrate side rather than the free space, and a thin substrate is preferred to maximise the radiated power and control the radiation direction.
{"title":"Effects of substrate on the performance of photoconductive THz antennas","authors":"Di Li, Yi Huang, Yao-chun Shen, N. Khiabani","doi":"10.1109/IWAT.2010.5464762","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464762","url":null,"abstract":"Photoconductive antennas have been widely used to generate and detect THz waves in recent years. Because the thickness of the substrate is usually larger than the wavelength of THz waves, surface/substrate modes may be generated and the effect of the substrate cannot be ignored - this has not been properly investigated. This paper is therefore to investigate this problem using a numerical simulation tool. The radiation pattern and power of photoconductive antennas with different sizes of substrates are obtained. The results show that the radiated power is sensitive to the dimensions of the substrate: most of the radiated power is radiated towards the substrate side rather than the free space, and a thin substrate is preferred to maximise the radiated power and control the radiation direction.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"15 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":"123827519","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.2010.5464681
Lu Guo, Sheng Wang, Xiao-dong Chen, C. Parini
A printed miniature ultra wideband (UWB) antenna has been studied by exploiting a quasi-self-complementary structure and a tapered radiating slot in this paper. The optimal design of this type of antenna features an ultra wide impedance bandwidth with reasonable radiation patterns. It exhibits a rather compact physical dimension of 19mm×16mm, corresponding to an electrically size of 0.19λ. A good agreement is obtained between the simulated and the measured antenna characteristics.
{"title":"A printed miniaturised antenna for ultra wideband systems","authors":"Lu Guo, Sheng Wang, Xiao-dong Chen, C. Parini","doi":"10.1109/IWAT.2010.5464681","DOIUrl":"https://doi.org/10.1109/IWAT.2010.5464681","url":null,"abstract":"A printed miniature ultra wideband (UWB) antenna has been studied by exploiting a quasi-self-complementary structure and a tapered radiating slot in this paper. The optimal design of this type of antenna features an ultra wide impedance bandwidth with reasonable radiation patterns. It exhibits a rather compact physical dimension of 19mm×16mm, corresponding to an electrically size of 0.19λ. A good agreement is obtained between the simulated and the measured antenna characteristics.","PeriodicalId":125732,"journal":{"name":"2010 International Workshop on Antenna Technology (iWAT)","volume":"35 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":"126500502","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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