Pub Date : 2013-12-01DOI: 10.1109/AEMC.2013.7045124
Greeshmaja Govind, M. Akhtar
An improved numerical optimization approach based on the Newton-Kantorovich iterative scheme to obtain the one dimensional dielectric image of the multi-layered media in terms of the measured spectral domain reflection data is presented. The improvement in the iterative scheme is achieved by computing the initial permittivity profile using an independent analytical approach. The analytical approach provides a very good initial guess of the unknown permittivity profile in terms of the a priori information, which significantly improves the convergence and stability of the achieved solution. The proposed scheme for solving the one-dimensional inverse scattering problem is successfully implemented, and validated with the help of independent simulated and experimental data.
{"title":"Improved numerical optimization approach for microwave imaging of multi-layered media","authors":"Greeshmaja Govind, M. Akhtar","doi":"10.1109/AEMC.2013.7045124","DOIUrl":"https://doi.org/10.1109/AEMC.2013.7045124","url":null,"abstract":"An improved numerical optimization approach based on the Newton-Kantorovich iterative scheme to obtain the one dimensional dielectric image of the multi-layered media in terms of the measured spectral domain reflection data is presented. The improvement in the iterative scheme is achieved by computing the initial permittivity profile using an independent analytical approach. The analytical approach provides a very good initial guess of the unknown permittivity profile in terms of the a priori information, which significantly improves the convergence and stability of the achieved solution. The proposed scheme for solving the one-dimensional inverse scattering problem is successfully implemented, and validated with the help of independent simulated and experimental data.","PeriodicalId":169237,"journal":{"name":"2013 IEEE Applied Electromagnetics Conference (AEMC)","volume":"06 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127215484","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 : 2013-12-01DOI: 10.1109/AEMC.2013.7045121
G. Mishra, S. Sahu
Now a days, the terahertz signals are finding different uses in the medical and the security applications. A lot many work need to be done in the terahertz regime to have fundamental technological advances. Here is represented a circular split ring resonator unit cell metamaterial model with inserted ferrite layer. The simulation results reveal the origins of the effective permittivity and permeability exhibiting perfect resonance properties. The phase shifting property of the ferrite materials lead to the perfect matching of the resonator structure.
{"title":"Terahertz split ring resonator with ferrite insertion","authors":"G. Mishra, S. Sahu","doi":"10.1109/AEMC.2013.7045121","DOIUrl":"https://doi.org/10.1109/AEMC.2013.7045121","url":null,"abstract":"Now a days, the terahertz signals are finding different uses in the medical and the security applications. A lot many work need to be done in the terahertz regime to have fundamental technological advances. Here is represented a circular split ring resonator unit cell metamaterial model with inserted ferrite layer. The simulation results reveal the origins of the effective permittivity and permeability exhibiting perfect resonance properties. The phase shifting property of the ferrite materials lead to the perfect matching of the resonator structure.","PeriodicalId":169237,"journal":{"name":"2013 IEEE Applied Electromagnetics Conference (AEMC)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124899059","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 : 2013-12-01DOI: 10.1109/AEMC.2013.7045048
N. Kumar, K. Vinoy, S. Gopalakrishnan
Finite element modeling of large-scale scattering problems like radar cross-section (RCS) lead to large matrices. Model order reduction (MOR) using eigenspace projection of these models involving plane wave excitation requires solution of nonlinear eigenvalue problems. This paper proposes a methodology to expediently compute wideband RCS. Jacobi-Davidson iteration is used to generate the projection spaces. Reduction by many orders in the system size and the computational cost is exemplified.
{"title":"Jacobi-Davidson iteration based reduced order finite element models for radar cross-section","authors":"N. Kumar, K. Vinoy, S. Gopalakrishnan","doi":"10.1109/AEMC.2013.7045048","DOIUrl":"https://doi.org/10.1109/AEMC.2013.7045048","url":null,"abstract":"Finite element modeling of large-scale scattering problems like radar cross-section (RCS) lead to large matrices. Model order reduction (MOR) using eigenspace projection of these models involving plane wave excitation requires solution of nonlinear eigenvalue problems. This paper proposes a methodology to expediently compute wideband RCS. Jacobi-Davidson iteration is used to generate the projection spaces. Reduction by many orders in the system size and the computational cost is exemplified.","PeriodicalId":169237,"journal":{"name":"2013 IEEE Applied Electromagnetics Conference (AEMC)","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123580210","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 : 2013-12-01DOI: 10.1109/AEMC.2013.7045109
J. Venkatachalapathi, P. H. Rao, K. Selvan
A broadband fractal slot coupled stacked microstrip antenna is presented. Third order fractal slots are used, to improve the antenna bandwidth. The antenna resonates at the center frequency of 1.5GHz and offers 30% bandwidth for a return loss criterion of 10dB. The introduction of fractal slot also leads to antenna miniaturization. The proposed configuration is fabricated and characterized for gain, return loss and radiation patterns. While the measured peak gain of the fractal slot coupled antenna configuration is 8 dB at the center frequency, an average gain of 7dB is measured over the band.
{"title":"Fractal slot coupled stacked microstrip antenna","authors":"J. Venkatachalapathi, P. H. Rao, K. Selvan","doi":"10.1109/AEMC.2013.7045109","DOIUrl":"https://doi.org/10.1109/AEMC.2013.7045109","url":null,"abstract":"A broadband fractal slot coupled stacked microstrip antenna is presented. Third order fractal slots are used, to improve the antenna bandwidth. The antenna resonates at the center frequency of 1.5GHz and offers 30% bandwidth for a return loss criterion of 10dB. The introduction of fractal slot also leads to antenna miniaturization. The proposed configuration is fabricated and characterized for gain, return loss and radiation patterns. While the measured peak gain of the fractal slot coupled antenna configuration is 8 dB at the center frequency, an average gain of 7dB is measured over the band.","PeriodicalId":169237,"journal":{"name":"2013 IEEE Applied Electromagnetics Conference (AEMC)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122556825","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 : 2013-12-01DOI: 10.1109/AEMC.2013.7045108
H. K. Bora, D. K. Neog
A printed quad band microstrip antenna is presented in this paper. The proposed microstrip-fed antenna consists of a circular ring connected to a slotted square with two arc shaped arms operates in the 1990 MHz Personal Communication System(PCS) band, 3.5/5.5 GHz worldwide interoperability for microwave access (WiMAX) bands, 6-7 GHz Satellite communication bands. The antenna has dimensions of 38×25×1.59 mm3. The proposed antenna is simulated with HFSS software and achieved good impedance bandwidth, directional radiation pattern and improved peak gain in the all four operating frequency bands.
{"title":"A novel quad band antenna for wireless application","authors":"H. K. Bora, D. K. Neog","doi":"10.1109/AEMC.2013.7045108","DOIUrl":"https://doi.org/10.1109/AEMC.2013.7045108","url":null,"abstract":"A printed quad band microstrip antenna is presented in this paper. The proposed microstrip-fed antenna consists of a circular ring connected to a slotted square with two arc shaped arms operates in the 1990 MHz Personal Communication System(PCS) band, 3.5/5.5 GHz worldwide interoperability for microwave access (WiMAX) bands, 6-7 GHz Satellite communication bands. The antenna has dimensions of 38×25×1.59 mm3. The proposed antenna is simulated with HFSS software and achieved good impedance bandwidth, directional radiation pattern and improved peak gain in the all four operating frequency bands.","PeriodicalId":169237,"journal":{"name":"2013 IEEE Applied Electromagnetics Conference (AEMC)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114462443","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 : 2013-12-01DOI: 10.1109/AEMC.2013.7045041
D. Biswas, S. Sen, B. Nataraj, V. Ramachandra
The paper describes a parametric analysis approach to design and configure a printed dipole antenna and its development methodology in S Band. The dipole radiators and balun in their strip forms have been printed on both sides of a substrate and embedded inside a compact radome for airborne application with omni radiation coverage in the yaw plane. The approach is based on identifying various design parameters, critically analyzing their effects and tailoring the geometry of the balun uniquely to arrive at a compact and optimized solution.
{"title":"An analytical approach for designing compact printed dipole antenna in S Band","authors":"D. Biswas, S. Sen, B. Nataraj, V. Ramachandra","doi":"10.1109/AEMC.2013.7045041","DOIUrl":"https://doi.org/10.1109/AEMC.2013.7045041","url":null,"abstract":"The paper describes a parametric analysis approach to design and configure a printed dipole antenna and its development methodology in S Band. The dipole radiators and balun in their strip forms have been printed on both sides of a substrate and embedded inside a compact radome for airborne application with omni radiation coverage in the yaw plane. The approach is based on identifying various design parameters, critically analyzing their effects and tailoring the geometry of the balun uniquely to arrive at a compact and optimized solution.","PeriodicalId":169237,"journal":{"name":"2013 IEEE Applied Electromagnetics Conference (AEMC)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124448915","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 : 2013-12-01DOI: 10.1109/AEMC.2013.7045040
P. Rahul, S. Sahu, A. Panda, S. Pahadsingh
In this paper, a band notched ultra-wideband antenna integrated with complementary split ring resonator (CSRR) is proposed and investigated. The proposed antenna not only covers the UWB frequency spectrum but also avoids interference with HIPERLAN/2 (5.15 GHz - 5.35 GHz) by giving a notch band from 4.98 GHz to 5.37 GHz. The centre frequency of the notched band is 5.2 GHz at which the wireless LAN (HIPERLAN/2) in Europe is assigned. The notch band in the proposed paper is achieved by etching CSRR in the radiating patch. The complementary split ring resonator acts as a bandstop filter and hence enables the rejection of any undesired band within the passband of the antenna. The proposed antenna operates from 2.7 GHz to 13.7 GHz for voltage standing wave ratio (VSWR) less than 2, except the notch band of 4.98 GHz to 5.37 GHz.
{"title":"An Ultra-wideband Antenna with HIPERLAN/2 band rejection using CSRR structure","authors":"P. Rahul, S. Sahu, A. Panda, S. Pahadsingh","doi":"10.1109/AEMC.2013.7045040","DOIUrl":"https://doi.org/10.1109/AEMC.2013.7045040","url":null,"abstract":"In this paper, a band notched ultra-wideband antenna integrated with complementary split ring resonator (CSRR) is proposed and investigated. The proposed antenna not only covers the UWB frequency spectrum but also avoids interference with HIPERLAN/2 (5.15 GHz - 5.35 GHz) by giving a notch band from 4.98 GHz to 5.37 GHz. The centre frequency of the notched band is 5.2 GHz at which the wireless LAN (HIPERLAN/2) in Europe is assigned. The notch band in the proposed paper is achieved by etching CSRR in the radiating patch. The complementary split ring resonator acts as a bandstop filter and hence enables the rejection of any undesired band within the passband of the antenna. The proposed antenna operates from 2.7 GHz to 13.7 GHz for voltage standing wave ratio (VSWR) less than 2, except the notch band of 4.98 GHz to 5.37 GHz.","PeriodicalId":169237,"journal":{"name":"2013 IEEE Applied Electromagnetics Conference (AEMC)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133049870","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 : 2013-12-01DOI: 10.1109/AEMC.2013.7045025
B. Mukherjee, Bappaditya Mandal, S. Parui, Santanu Das
In this paper, a Co-planar waveguide (CPW) fed wide bandwidth slot antenna is proposed for UWB applications. The antenna consists of a rectangular slot modified at both side of the CPW feed forming two symmetrical step like ground structure. The proposed antenna structure is simulated by using Finite element Method based ANSOFT HFSS electromagnetic simulation software and characterized by return loss, radiation pattern and gain response. The proposed antenna exhibits an impedance bandwidth from 3.46 GHz to 10.48 GHz that gives a fractional bandwidth of 101% with return loss less than or equal to 10 dB (VSWR≤ 2). The maximum available gain is 4.5dBi in the broad side direction.
{"title":"Coplanar waveguide fed wide band modified rectangular slot antenna for UWB applications","authors":"B. Mukherjee, Bappaditya Mandal, S. Parui, Santanu Das","doi":"10.1109/AEMC.2013.7045025","DOIUrl":"https://doi.org/10.1109/AEMC.2013.7045025","url":null,"abstract":"In this paper, a Co-planar waveguide (CPW) fed wide bandwidth slot antenna is proposed for UWB applications. The antenna consists of a rectangular slot modified at both side of the CPW feed forming two symmetrical step like ground structure. The proposed antenna structure is simulated by using Finite element Method based ANSOFT HFSS electromagnetic simulation software and characterized by return loss, radiation pattern and gain response. The proposed antenna exhibits an impedance bandwidth from 3.46 GHz to 10.48 GHz that gives a fractional bandwidth of 101% with return loss less than or equal to 10 dB (VSWR≤ 2). The maximum available gain is 4.5dBi in the broad side direction.","PeriodicalId":169237,"journal":{"name":"2013 IEEE Applied Electromagnetics Conference (AEMC)","volume":"199 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115685274","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 : 2013-12-01DOI: 10.1109/AEMC.2013.7045101
B. Ramesh, V. Lakshmi
The paper presents the design of circular patch antenna with a simple rectangular defected ground structure (DGS) for ultra-wide band width. The comparative study of patch without DGS and with DGS is presented. The effect of dimensions of rectangular DGS on the performance of the antenna is also observed. An ultra-wide band width from 3GHz to 12GHz is achieved with less than -10dB return loss and is suitable for many applications. The simulation was done with CST MW Studio.
{"title":"Design of an ultrawideband circular microstrip antenna with DGS","authors":"B. Ramesh, V. Lakshmi","doi":"10.1109/AEMC.2013.7045101","DOIUrl":"https://doi.org/10.1109/AEMC.2013.7045101","url":null,"abstract":"The paper presents the design of circular patch antenna with a simple rectangular defected ground structure (DGS) for ultra-wide band width. The comparative study of patch without DGS and with DGS is presented. The effect of dimensions of rectangular DGS on the performance of the antenna is also observed. An ultra-wide band width from 3GHz to 12GHz is achieved with less than -10dB return loss and is suitable for many applications. The simulation was done with CST MW Studio.","PeriodicalId":169237,"journal":{"name":"2013 IEEE Applied Electromagnetics Conference (AEMC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114768409","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 : 2013-12-01DOI: 10.1109/AEMC.2013.7045077
J. S. Sajin, P. H. Rao
The reconfigurability of phase delay in a complementary split ring resonator (CSRR) loaded microstrip transmission line with capacitive stubs is presented. The reconfigurable phase delay is achieved by varying the short positions on the CSRR. A linear increment in the phase delay is obtained by varying the short positions of the inner ring of the CSRR. Five distinct phase delays are obtained for different positions of the short with a maximum phase delay of -340°. The phase delays generated by the Left Handed phase delay line fall within a range between -340.32° and -308.97° when compared to a reference transmission line.
{"title":"Reconfigurable left handed microstrip phase delay line","authors":"J. S. Sajin, P. H. Rao","doi":"10.1109/AEMC.2013.7045077","DOIUrl":"https://doi.org/10.1109/AEMC.2013.7045077","url":null,"abstract":"The reconfigurability of phase delay in a complementary split ring resonator (CSRR) loaded microstrip transmission line with capacitive stubs is presented. The reconfigurable phase delay is achieved by varying the short positions on the CSRR. A linear increment in the phase delay is obtained by varying the short positions of the inner ring of the CSRR. Five distinct phase delays are obtained for different positions of the short with a maximum phase delay of -340°. The phase delays generated by the Left Handed phase delay line fall within a range between -340.32° and -308.97° when compared to a reference transmission line.","PeriodicalId":169237,"journal":{"name":"2013 IEEE Applied Electromagnetics Conference (AEMC)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123423599","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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