Pub Date : 2015-03-04DOI: 10.1109/IWAT.2015.7365358
Changhong Zhang, Xianling Liang, Jun-ping Geng, R. Jin
A single-layer single-feed bidirectional radiated circularly polarized `G'-shaped microstrip-line antenna is proposed. The `G'-shaped microstrip-line is composed of multi segments for good matching and pure circular polarization. Moreover, a semi circle arc shaped ground is used to obtain no tilted radiation pattern. Simulations show that the antenna has 10-dB return loss bandwidth of 9%, 3-dB axial-ratio bandwidth of 11% and beamwidth of 60o, and the gain is larger than 3.6 dBic over the band from 4.4 GHz to 5 GHz.
{"title":"Single-layer single-feed bidirectional radiated circularly polarized ‘G’-shaped microstrip-line antenna","authors":"Changhong Zhang, Xianling Liang, Jun-ping Geng, R. Jin","doi":"10.1109/IWAT.2015.7365358","DOIUrl":"https://doi.org/10.1109/IWAT.2015.7365358","url":null,"abstract":"A single-layer single-feed bidirectional radiated circularly polarized `G'-shaped microstrip-line antenna is proposed. The `G'-shaped microstrip-line is composed of multi segments for good matching and pure circular polarization. Moreover, a semi circle arc shaped ground is used to obtain no tilted radiation pattern. Simulations show that the antenna has 10-dB return loss bandwidth of 9%, 3-dB axial-ratio bandwidth of 11% and beamwidth of 60o, and the gain is larger than 3.6 dBic over the band from 4.4 GHz to 5 GHz.","PeriodicalId":342623,"journal":{"name":"2015 International Workshop on Antenna Technology (iWAT)","volume":"14 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134515372","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 : 2015-03-04DOI: 10.1109/IWAT.2015.7365298
S. Kurokawa, M. Hirose, M. Ameya
We propose an optical reflection-type electro-absorption modulator having high stability of time by using a super luminescent diode. Our proposed modulator can improve the time stability without temperature control. Time stability of our proposed modulator is less than 0.2 dB during the ambient temperature variation less than 3 degrees.
{"title":"Optical reneciion-iype electro-adsorption modulator having high stability with time by using super luminescent diode","authors":"S. Kurokawa, M. Hirose, M. Ameya","doi":"10.1109/IWAT.2015.7365298","DOIUrl":"https://doi.org/10.1109/IWAT.2015.7365298","url":null,"abstract":"We propose an optical reflection-type electro-absorption modulator having high stability of time by using a super luminescent diode. Our proposed modulator can improve the time stability without temperature control. Time stability of our proposed modulator is less than 0.2 dB during the ambient temperature variation less than 3 degrees.","PeriodicalId":342623,"journal":{"name":"2015 International Workshop on Antenna Technology (iWAT)","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132573540","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 : 2015-03-04DOI: 10.1109/IWAT.2015.7365352
Ki Joon Kim, W. Choi, Y. Yoon, Seok-hee Bae
The 8×8 array applicator for 915 MHz hyperthermia proposed. Proposed array applicator is 8×8 lattice array with and without phased feeding. 8×8 lattice array with same phase is for superficial hyperthermia. 8×8 lattice array with phased feeding is for ultra-superficial hyperthermia, which has deeper treatment area. 8×8 lattice array without phased feeding has 61 % effective treatment area of array size in 2 cm depth from skin surface. 8×8 lattice array with phased feeding has penetration enhancement from 34 mm to 49 mm.
{"title":"Planar array for non-invasive ultra-superficial hyperthermia applicator","authors":"Ki Joon Kim, W. Choi, Y. Yoon, Seok-hee Bae","doi":"10.1109/IWAT.2015.7365352","DOIUrl":"https://doi.org/10.1109/IWAT.2015.7365352","url":null,"abstract":"The 8×8 array applicator for 915 MHz hyperthermia proposed. Proposed array applicator is 8×8 lattice array with and without phased feeding. 8×8 lattice array with same phase is for superficial hyperthermia. 8×8 lattice array with phased feeding is for ultra-superficial hyperthermia, which has deeper treatment area. 8×8 lattice array without phased feeding has 61 % effective treatment area of array size in 2 cm depth from skin surface. 8×8 lattice array with phased feeding has penetration enhancement from 34 mm to 49 mm.","PeriodicalId":342623,"journal":{"name":"2015 International Workshop on Antenna Technology (iWAT)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130970880","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 : 2015-03-04DOI: 10.1109/IWAT.2015.7365297
H. Chao, Chi-Fang Huang
In order to improve the homogeneity of volumetric temperature distribution in the hyperthermia for bio-materials, this paper studies the optima spatial configuration of the implanted ferrite needles. The magnetic induction heating system and thermal effects are modelled and simulated by an engineering simulation package. Finally, the results and analysis from thermal simulations of this issue are presented in this work.
{"title":"Optimal arrangement of implant needles for temperature homogeneity in magnetic induction heating for tumor treatment","authors":"H. Chao, Chi-Fang Huang","doi":"10.1109/IWAT.2015.7365297","DOIUrl":"https://doi.org/10.1109/IWAT.2015.7365297","url":null,"abstract":"In order to improve the homogeneity of volumetric temperature distribution in the hyperthermia for bio-materials, this paper studies the optima spatial configuration of the implanted ferrite needles. The magnetic induction heating system and thermal effects are modelled and simulated by an engineering simulation package. Finally, the results and analysis from thermal simulations of this issue are presented in this work.","PeriodicalId":342623,"journal":{"name":"2015 International Workshop on Antenna Technology (iWAT)","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132325417","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 : 2015-03-04DOI: 10.1109/IWAT.2015.7365279
Chan-Sun Park, Yi-Ru Jeong, J. Yook, I. Hong, H. Chun, Y. Park, Y. Kim
Registration sensitivity study of double-layer cross FSS and 4-legged slot FSS designed for FSS radome was conducted in this paper. Transmission properties, from aligned structure to misaligned structure of half periodicity of unit cell between FSS layers, were discussed. Transmission properties such as center frequency, 3-dB bandwidth and specific characteristic of each misaligned double layer FSS are shown in the paper. The results show that each FSS structure had maximum center frequency transition of 2 GHz and 1.2 GHz and also bandwidth showed change.
{"title":"Registration sensitivity study of double-layer FSS design for radome","authors":"Chan-Sun Park, Yi-Ru Jeong, J. Yook, I. Hong, H. Chun, Y. Park, Y. Kim","doi":"10.1109/IWAT.2015.7365279","DOIUrl":"https://doi.org/10.1109/IWAT.2015.7365279","url":null,"abstract":"Registration sensitivity study of double-layer cross FSS and 4-legged slot FSS designed for FSS radome was conducted in this paper. Transmission properties, from aligned structure to misaligned structure of half periodicity of unit cell between FSS layers, were discussed. Transmission properties such as center frequency, 3-dB bandwidth and specific characteristic of each misaligned double layer FSS are shown in the paper. The results show that each FSS structure had maximum center frequency transition of 2 GHz and 1.2 GHz and also bandwidth showed change.","PeriodicalId":342623,"journal":{"name":"2015 International Workshop on Antenna Technology (iWAT)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132342617","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 : 2015-03-04DOI: 10.1109/IWAT.2015.7365287
C. H. Lee, Y. K. Cho, B. Kim
The wavelength shift of transmission resonance was achieved by a tapered metallic slit. We simulated the transmission and reflection of the tapered slit structure with the tapered slit width of 0.25, 0.5, 0.75 and 1 mm. The tapered slit angle shifted higher the resonance frequency, by which the cavity resonant length became shorter.
{"title":"Wavelength shift of transmission resonance by a tapered metallic slit","authors":"C. H. Lee, Y. K. Cho, B. Kim","doi":"10.1109/IWAT.2015.7365287","DOIUrl":"https://doi.org/10.1109/IWAT.2015.7365287","url":null,"abstract":"The wavelength shift of transmission resonance was achieved by a tapered metallic slit. We simulated the transmission and reflection of the tapered slit structure with the tapered slit width of 0.25, 0.5, 0.75 and 1 mm. The tapered slit angle shifted higher the resonance frequency, by which the cavity resonant length became shorter.","PeriodicalId":342623,"journal":{"name":"2015 International Workshop on Antenna Technology (iWAT)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123856933","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 : 2015-03-04DOI: 10.1109/IWAT.2015.7365296
M. B. Raza, T. Fickenscher
Mitigation of the impact of wind turbine (WT) forward scattering on radars, navigation systems and terrestrial radio links requires accurate modelling and rapid calculation of diffraction of RF and microwave signals at the tower and rotor of WTs. A proper analysis by 3D numerical field simulation is very time consuming as the problem is electrically extremely large. We are using 2D Fresnel-Kirchhoff diffraction formula and speed up numerical integration using Babinet's principle. Furthermore, perfect conducting and real ground plane is accounted for. Time variant diffraction loss (or obstacle gain) and phase modulation as well as time-frequency spectrum of the frequency deviation of the forward scattered signal is presented. Results are verified by numerical 3D field simulations (Uniform Theory of Diffraction).
{"title":"Impact of ground plane on wind turbine forward scattering","authors":"M. B. Raza, T. Fickenscher","doi":"10.1109/IWAT.2015.7365296","DOIUrl":"https://doi.org/10.1109/IWAT.2015.7365296","url":null,"abstract":"Mitigation of the impact of wind turbine (WT) forward scattering on radars, navigation systems and terrestrial radio links requires accurate modelling and rapid calculation of diffraction of RF and microwave signals at the tower and rotor of WTs. A proper analysis by 3D numerical field simulation is very time consuming as the problem is electrically extremely large. We are using 2D Fresnel-Kirchhoff diffraction formula and speed up numerical integration using Babinet's principle. Furthermore, perfect conducting and real ground plane is accounted for. Time variant diffraction loss (or obstacle gain) and phase modulation as well as time-frequency spectrum of the frequency deviation of the forward scattered signal is presented. Results are verified by numerical 3D field simulations (Uniform Theory of Diffraction).","PeriodicalId":342623,"journal":{"name":"2015 International Workshop on Antenna Technology (iWAT)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122584518","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 : 2015-03-04DOI: 10.1109/IWAT.2015.7365369
Q. Cheng, H. Ma, T. Cui
Metamaterials are man-made artificial periodic structures composed by sub wavelength electromagnetic resonant or non-resonant structures, which can be characterized by effective medium parameters. The potential applications of such materials have attracted a great deal of interest within the scientific communities, like the negative refraction lens and invisible cloaks. In this paper, we will introduce some examples of microwave lens and low scattering surfaces based on metamaterials. We believe that these designs are good candidates to replace traditional devices in microwave and optical engineering.
{"title":"Microwave antennas and low RCS surfaces based on metamaterials","authors":"Q. Cheng, H. Ma, T. Cui","doi":"10.1109/IWAT.2015.7365369","DOIUrl":"https://doi.org/10.1109/IWAT.2015.7365369","url":null,"abstract":"Metamaterials are man-made artificial periodic structures composed by sub wavelength electromagnetic resonant or non-resonant structures, which can be characterized by effective medium parameters. The potential applications of such materials have attracted a great deal of interest within the scientific communities, like the negative refraction lens and invisible cloaks. In this paper, we will introduce some examples of microwave lens and low scattering surfaces based on metamaterials. We believe that these designs are good candidates to replace traditional devices in microwave and optical engineering.","PeriodicalId":342623,"journal":{"name":"2015 International Workshop on Antenna Technology (iWAT)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121608472","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 : 2015-03-04DOI: 10.1109/IWAT.2015.7365304
S. Ta, I. Park
This paper introduces a single-feed dual-band antenna for an anti-jam global positioning system array. The antenna is composed of a circularly polarized (CP) crossed scythe-shaped dipole over a finite artificial magnetic conductor (AMC) reflector. The dual-band operation is obtained by utilizing the original band generated by the radiator and an additional band caused by surface waves propagating on the finite AMC. The compact radiating system, including the crossed dipole and the finite AMC surface, is backed by a cavity to achieve a wide CP radiation beamwidth and a high level of mutual coupling at both bands.
{"title":"A single-feed dual-band antenna for an anti-jam GPS array","authors":"S. Ta, I. Park","doi":"10.1109/IWAT.2015.7365304","DOIUrl":"https://doi.org/10.1109/IWAT.2015.7365304","url":null,"abstract":"This paper introduces a single-feed dual-band antenna for an anti-jam global positioning system array. The antenna is composed of a circularly polarized (CP) crossed scythe-shaped dipole over a finite artificial magnetic conductor (AMC) reflector. The dual-band operation is obtained by utilizing the original band generated by the radiator and an additional band caused by surface waves propagating on the finite AMC. The compact radiating system, including the crossed dipole and the finite AMC surface, is backed by a cavity to achieve a wide CP radiation beamwidth and a high level of mutual coupling at both bands.","PeriodicalId":342623,"journal":{"name":"2015 International Workshop on Antenna Technology (iWAT)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116951359","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 : 2015-03-04DOI: 10.1109/IWAT.2015.7365379
T. Nguyen, Jae-Young Chung
In this paper, we report results of parametric study on the radiation efficiency of woven textile antennas using full-wave simulations and measurements. The parameters of interest are the conductive thread diameter and intervals between the threads consisting of a rectangular woven patch. In a full-wave simulation tool, rectangular patch antennas are modeled by weaving conductive threads with different thread diameters and intervals. The results show that the radiation efficiency increases with a wider interval between the threads when a thicker conductive thread is used. This contrasts with the common assumptions that radiation efficiency increases as more conductive material is used. These results are also validated by experiments on woven patch antennas fabricated with silver-coated threads.
{"title":"Parametric study on radiation efficiency of woven textile antennas","authors":"T. Nguyen, Jae-Young Chung","doi":"10.1109/IWAT.2015.7365379","DOIUrl":"https://doi.org/10.1109/IWAT.2015.7365379","url":null,"abstract":"In this paper, we report results of parametric study on the radiation efficiency of woven textile antennas using full-wave simulations and measurements. The parameters of interest are the conductive thread diameter and intervals between the threads consisting of a rectangular woven patch. In a full-wave simulation tool, rectangular patch antennas are modeled by weaving conductive threads with different thread diameters and intervals. The results show that the radiation efficiency increases with a wider interval between the threads when a thicker conductive thread is used. This contrasts with the common assumptions that radiation efficiency increases as more conductive material is used. These results are also validated by experiments on woven patch antennas fabricated with silver-coated threads.","PeriodicalId":342623,"journal":{"name":"2015 International Workshop on Antenna Technology (iWAT)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114222502","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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