Pub Date : 2010-12-03DOI: 10.1109/ICEAA.2010.5653725
M. V. van Beurden, J. A. H. M. Vaessen, A. Tijhuis
Boundary integral equations for bodies of revolution have a Green's function kernel that can be written as the azimuthal integral over the free-space Green's function. We show that existing approximation methods for computing this integral suffer from efficiency or stability problems. Improvement of one of these methods leads to controllable accuracy while retaining efficiency.
{"title":"Numerical kernel construction for bodies of revolution with highorder Fourier modes","authors":"M. V. van Beurden, J. A. H. M. Vaessen, A. Tijhuis","doi":"10.1109/ICEAA.2010.5653725","DOIUrl":"https://doi.org/10.1109/ICEAA.2010.5653725","url":null,"abstract":"Boundary integral equations for bodies of revolution have a Green's function kernel that can be written as the azimuthal integral over the free-space Green's function. We show that existing approximation methods for computing this integral suffer from efficiency or stability problems. Improvement of one of these methods leads to controllable accuracy while retaining efficiency.","PeriodicalId":375707,"journal":{"name":"2010 International Conference on Electromagnetics in Advanced Applications","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121115547","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 : 2010-12-03DOI: 10.1109/ICEAA.2010.5653176
M. Tanabe, Y. Masuda
This paper describes the axial ratio characteristics of an Archimedean spiral antenna placed on a thin magnetic material. The thin magnetic material having a high permittivity and some magnetic loss tangent is used. The outer circumference of the spiral antenna is chosen to be approximately one wavelength at 300 MHz. To obtain a unidirectional beam, the antenna is located above a ground plane. The proposed antenna is analyzed using the finite-difference time-domain method. For comparison, a spiral antenna without the thin magnetic material is also analyzed. We have come to the conclusion that the spiral antenna on the thin magnetic material radiates a circularly polarized wave at lower frequencies.
{"title":"Axial ratio characteristics of an Archimedean spiral antenna on a thin magnetic material","authors":"M. Tanabe, Y. Masuda","doi":"10.1109/ICEAA.2010.5653176","DOIUrl":"https://doi.org/10.1109/ICEAA.2010.5653176","url":null,"abstract":"This paper describes the axial ratio characteristics of an Archimedean spiral antenna placed on a thin magnetic material. The thin magnetic material having a high permittivity and some magnetic loss tangent is used. The outer circumference of the spiral antenna is chosen to be approximately one wavelength at 300 MHz. To obtain a unidirectional beam, the antenna is located above a ground plane. The proposed antenna is analyzed using the finite-difference time-domain method. For comparison, a spiral antenna without the thin magnetic material is also analyzed. We have come to the conclusion that the spiral antenna on the thin magnetic material radiates a circularly polarized wave at lower frequencies.","PeriodicalId":375707,"journal":{"name":"2010 International Conference on Electromagnetics in Advanced Applications","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115101548","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 : 2010-12-03DOI: 10.1109/ICEAA.2010.5653909
Chonghua Fang, Qi Zhang, Da-gang Xie
This work simulates the shielding characteristic of a typical decay waveguide window for EMP. In the past, most researchers on electromagnetic protection have mainly focused their attention on the aperture coupling on the rectangular cavity. In contrast, the focus of this paper is not on it, but rather on the shielding characteristic of a typical decay waveguide window for EMP. The effect on EM coupling and shielding due to penetration through apertures behind it is also investigated. Here, the popular double exponential pulse has been used in the simulation of incident EMP. Full wave method of finite integration has been employed for the field strength at different points behind the window decay waveguide window. In addition, field nephograms are obtained for showing the whole shielding characteristic. Finally, the simulated results are verified with test data
{"title":"Simulation of shielding characteristic of a typical decay waveguide window for EMP","authors":"Chonghua Fang, Qi Zhang, Da-gang Xie","doi":"10.1109/ICEAA.2010.5653909","DOIUrl":"https://doi.org/10.1109/ICEAA.2010.5653909","url":null,"abstract":"This work simulates the shielding characteristic of a typical decay waveguide window for EMP. In the past, most researchers on electromagnetic protection have mainly focused their attention on the aperture coupling on the rectangular cavity. In contrast, the focus of this paper is not on it, but rather on the shielding characteristic of a typical decay waveguide window for EMP. The effect on EM coupling and shielding due to penetration through apertures behind it is also investigated. Here, the popular double exponential pulse has been used in the simulation of incident EMP. Full wave method of finite integration has been employed for the field strength at different points behind the window decay waveguide window. In addition, field nephograms are obtained for showing the whole shielding characteristic. Finally, the simulated results are verified with test data","PeriodicalId":375707,"journal":{"name":"2010 International Conference on Electromagnetics in Advanced Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115174485","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 : 2010-12-03DOI: 10.1109/ICEAA.2010.5651563
Eunjoo Kim, H. Ryu, J. Woo
In this paper a printed inverted-F antenna (IFA) is miniaturized by loading a ceramic chip coupler for bluetooth applications. The chip coupler is composed of printed meander lines on surfaces of the ceramic (εr=21) chip. The proposed printed IFA with the chip coupler is reduced up to 64.9 % compared with a general printed IFA. The size of antenna is a volume of 35.1 mm3. The −10 dB bandwidth was measured as 90 MHz (3.68 %). The measured radiation pattern shows omnidirectional patterns in the yz plane and xy plane.
{"title":"An electrically small printed inverted-F antenna with a ceramic chip coupler","authors":"Eunjoo Kim, H. Ryu, J. Woo","doi":"10.1109/ICEAA.2010.5651563","DOIUrl":"https://doi.org/10.1109/ICEAA.2010.5651563","url":null,"abstract":"In this paper a printed inverted-F antenna (IFA) is miniaturized by loading a ceramic chip coupler for bluetooth applications. The chip coupler is composed of printed meander lines on surfaces of the ceramic (εr=21) chip. The proposed printed IFA with the chip coupler is reduced up to 64.9 % compared with a general printed IFA. The size of antenna is a volume of 35.1 mm3. The −10 dB bandwidth was measured as 90 MHz (3.68 %). The measured radiation pattern shows omnidirectional patterns in the yz plane and xy plane.","PeriodicalId":375707,"journal":{"name":"2010 International Conference on Electromagnetics in Advanced Applications","volume":"231 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122455327","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 : 2010-12-03DOI: 10.1109/ICEAA.2010.5653095
T. Michiyama, K. Asanuma, S. Kuwano
We previously proposed a new coaxial-slot antenna of not whole conductor needle but one sandwiched dielectric between conductors for cancer therapy. The heating of the antenna was possessed of suppressed extension in the direction of the tip compared with that of the antenna of whole conductor needle, as a result of the experiment of liver phantom In this paper, we calculate the heating characteristics of the antenna in the liver model. It is shown that the heating pattern is similar to the measured one although the value is different
{"title":"Numerical simulation of heating characteristics in a new microwave coaxial-slot antenna for cancer therapy","authors":"T. Michiyama, K. Asanuma, S. Kuwano","doi":"10.1109/ICEAA.2010.5653095","DOIUrl":"https://doi.org/10.1109/ICEAA.2010.5653095","url":null,"abstract":"We previously proposed a new coaxial-slot antenna of not whole conductor needle but one sandwiched dielectric between conductors for cancer therapy. The heating of the antenna was possessed of suppressed extension in the direction of the tip compared with that of the antenna of whole conductor needle, as a result of the experiment of liver phantom In this paper, we calculate the heating characteristics of the antenna in the liver model. It is shown that the heating pattern is similar to the measured one although the value is different","PeriodicalId":375707,"journal":{"name":"2010 International Conference on Electromagnetics in Advanced Applications","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122602796","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 : 2010-12-03DOI: 10.1109/ICEAA.2010.5654003
A. Kadri, A. Abu-Dayya, D. Trinchero, R. Stefanelli
The interest in the exploitation of wireless sensor networks in dissipative media (other than the free space) is nowadays growing in importance, thanks to the identification of ever newer fields of applications. This paper introduces an efficient design methodology for an easy definition of the characteristics of mobile sensors inserted in pipes filled with fluids. The proposed procedure takes into account all the physical parameters of the systems such as: the performance range of the acoustic transducer, the acoustic and electromagnetic coupling mechanism among different media, and the electromagnetic interaction within the sensor and among the electronic and metallic components. Results obtained for the design of mobile sensor networks floating in underground water conduits confirm the adequacy of the proposed method.
{"title":"Design of radio-acoustic sensors for leakage detection in underground water pipes","authors":"A. Kadri, A. Abu-Dayya, D. Trinchero, R. Stefanelli","doi":"10.1109/ICEAA.2010.5654003","DOIUrl":"https://doi.org/10.1109/ICEAA.2010.5654003","url":null,"abstract":"The interest in the exploitation of wireless sensor networks in dissipative media (other than the free space) is nowadays growing in importance, thanks to the identification of ever newer fields of applications. This paper introduces an efficient design methodology for an easy definition of the characteristics of mobile sensors inserted in pipes filled with fluids. The proposed procedure takes into account all the physical parameters of the systems such as: the performance range of the acoustic transducer, the acoustic and electromagnetic coupling mechanism among different media, and the electromagnetic interaction within the sensor and among the electronic and metallic components. Results obtained for the design of mobile sensor networks floating in underground water conduits confirm the adequacy of the proposed method.","PeriodicalId":375707,"journal":{"name":"2010 International Conference on Electromagnetics in Advanced Applications","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122206553","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 : 2010-12-03DOI: 10.1109/ICEAA.2010.5653831
K. Whites, T. Amert, L. Groven, B. Glover
A new metallo-dielectric metamaterial is described in this paper that is comprised of a lattice of so-called dumbbell particles. Low loss with potentially large index of refraction is possible with these artificial electromagnetic materials using multiple enhancement effects including thin layers of high dielectric constant, low loss composite films printed between layers of dumbbell particles. Spray deposition of these composite dielectric layers is described.
{"title":"Low loss, high index of refraction metamaterials based on multiple enhancement mechanisms","authors":"K. Whites, T. Amert, L. Groven, B. Glover","doi":"10.1109/ICEAA.2010.5653831","DOIUrl":"https://doi.org/10.1109/ICEAA.2010.5653831","url":null,"abstract":"A new metallo-dielectric metamaterial is described in this paper that is comprised of a lattice of so-called dumbbell particles. Low loss with potentially large index of refraction is possible with these artificial electromagnetic materials using multiple enhancement effects including thin layers of high dielectric constant, low loss composite films printed between layers of dumbbell particles. Spray deposition of these composite dielectric layers is described.","PeriodicalId":375707,"journal":{"name":"2010 International Conference on Electromagnetics in Advanced Applications","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117077565","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 : 2010-12-03DOI: 10.1109/ICEAA.2010.5653692
M. R. Pereira, H. Salgado, J. Pereira
We propose the use of inverse scattering for the design of filters, in microstrip technology, with a specified reflective group delay response. The inverse scattering is performed using the layer peeling algorithm. The method is simple and easily implemented numerically. To validate the method, filters with a reflective linear group delay were designed and implemented. The simulation and measurement results are shown to agree well the target response.
{"title":"Synthesis of microstrip filters with arbitrary reflective group delay response","authors":"M. R. Pereira, H. Salgado, J. Pereira","doi":"10.1109/ICEAA.2010.5653692","DOIUrl":"https://doi.org/10.1109/ICEAA.2010.5653692","url":null,"abstract":"We propose the use of inverse scattering for the design of filters, in microstrip technology, with a specified reflective group delay response. The inverse scattering is performed using the layer peeling algorithm. The method is simple and easily implemented numerically. To validate the method, filters with a reflective linear group delay were designed and implemented. The simulation and measurement results are shown to agree well the target response.","PeriodicalId":375707,"journal":{"name":"2010 International Conference on Electromagnetics in Advanced Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129712850","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 : 2010-12-03DOI: 10.1109/ICEAA.2010.5651138
E. Palantei, L. R. Emakarim, A. Nugraha, N. K. Subaer
Several horn antennas designed to operate at various frequencies including ISM bands (433 MHz, 0.9, 2.5, 3.5 and 5 GHz) and 1.8 GHz, respectively, are discussed. The preliminary construction of these antennas was firstly implemented through numerical computation using the available HFSS 11 optimizer tools. The optimization process was done by simply varying the size and angle of flares. The best design of each horn prototype was achieved for the setting of flares size and angle that contributed to the optimum value of S11, impedance bandwidth, gain and directivity. Other horn parameters such as waveguide width, length and height are kept constant. The fabrication and experimental testing were performed in Telematics Laboratory (UNHAS). This paper presents the numerical and experimental results of those processes. These include the impact of flares angle variations to the horn properties. Some modifications of horn antennas such as double and quad ridges, both linear and arc-circle forms and horn with cavity back, are also outlined.
{"title":"Optimized wideband horn antennas of high gain and directivity","authors":"E. Palantei, L. R. Emakarim, A. Nugraha, N. K. Subaer","doi":"10.1109/ICEAA.2010.5651138","DOIUrl":"https://doi.org/10.1109/ICEAA.2010.5651138","url":null,"abstract":"Several horn antennas designed to operate at various frequencies including ISM bands (433 MHz, 0.9, 2.5, 3.5 and 5 GHz) and 1.8 GHz, respectively, are discussed. The preliminary construction of these antennas was firstly implemented through numerical computation using the available HFSS 11 optimizer tools. The optimization process was done by simply varying the size and angle of flares. The best design of each horn prototype was achieved for the setting of flares size and angle that contributed to the optimum value of S11, impedance bandwidth, gain and directivity. Other horn parameters such as waveguide width, length and height are kept constant. The fabrication and experimental testing were performed in Telematics Laboratory (UNHAS). This paper presents the numerical and experimental results of those processes. These include the impact of flares angle variations to the horn properties. Some modifications of horn antennas such as double and quad ridges, both linear and arc-circle forms and horn with cavity back, are also outlined.","PeriodicalId":375707,"journal":{"name":"2010 International Conference on Electromagnetics in Advanced Applications","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128562544","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 : 2010-12-03DOI: 10.1109/ICEAA.2010.5650005
D. Blagoveshchensky, M. Sergeeva, A. Kalishin
Manifestation of magnetospheric disturbances in the Earth's ionosphere has a very complex character. Magnetospheric storms and substorms cause drastic violation of the ionosphere structure. As a result, there are some difficulties in operation of different radio systems: communications, navigation, over-horizon radiolocation and so on. The specific regularities in variations of both frequency range on the path and critical frequencies of the F2 layer through the ionosondes chain during the disturbed period were revealed.
{"title":"Multilateral investigation of the ionosphere through a magnetospheric storm","authors":"D. Blagoveshchensky, M. Sergeeva, A. Kalishin","doi":"10.1109/ICEAA.2010.5650005","DOIUrl":"https://doi.org/10.1109/ICEAA.2010.5650005","url":null,"abstract":"Manifestation of magnetospheric disturbances in the Earth's ionosphere has a very complex character. Magnetospheric storms and substorms cause drastic violation of the ionosphere structure. As a result, there are some difficulties in operation of different radio systems: communications, navigation, over-horizon radiolocation and so on. The specific regularities in variations of both frequency range on the path and critical frequencies of the F2 layer through the ionosondes chain during the disturbed period were revealed.","PeriodicalId":375707,"journal":{"name":"2010 International Conference on Electromagnetics in Advanced Applications","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127011589","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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