Pub Date : 2013-12-01DOI: 10.1109/AEMC.2013.7045070
S. Sharma
Reconfigurable and tunable antennas are getting popular because of reduced number of antennas to meet several wireless communication applications on a given devices such as Mobile phone, tablets, laptop and wireless routers. However, this benefit comes at the cost of some trade-offs such as complexity in antenna simulation design, fabrication and experimental verification including reduced antenna performance than a passive antenna. In this talk, some of these aspects will be presented based on the research work being performed at San Diego State University. Interested readers are encouraged to read reference papers for additional details.
{"title":"Design considerations of reconfigurable and tunable planar antennas","authors":"S. Sharma","doi":"10.1109/AEMC.2013.7045070","DOIUrl":"https://doi.org/10.1109/AEMC.2013.7045070","url":null,"abstract":"Reconfigurable and tunable antennas are getting popular because of reduced number of antennas to meet several wireless communication applications on a given devices such as Mobile phone, tablets, laptop and wireless routers. However, this benefit comes at the cost of some trade-offs such as complexity in antenna simulation design, fabrication and experimental verification including reduced antenna performance than a passive antenna. In this talk, some of these aspects will be presented based on the research work being performed at San Diego State University. Interested readers are encouraged to read reference papers for additional details.","PeriodicalId":169237,"journal":{"name":"2013 IEEE Applied Electromagnetics Conference (AEMC)","volume":"3 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":"128512964","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.2013.7045105
B. Majumder, K. Krishnamoorthy, J. Mukherjee
A novel dual band compact near to edge located via-comb shape EBG (NELV-CEBG) has been proposed and its compactness has been studied. A good reduction level of 8-21 dB has been observed when 7×3 matrix of the proposed structure has been applied to enhance the isolation between the patch antenna arrays operating over WIMAX band.
{"title":"A novel compact comb shaped EBG structure for coupling reduction in WIMAX band","authors":"B. Majumder, K. Krishnamoorthy, J. Mukherjee","doi":"10.1109/AEMC.2013.7045105","DOIUrl":"https://doi.org/10.1109/AEMC.2013.7045105","url":null,"abstract":"A novel dual band compact near to edge located via-comb shape EBG (NELV-CEBG) has been proposed and its compactness has been studied. A good reduction level of 8-21 dB has been observed when 7×3 matrix of the proposed structure has been applied to enhance the isolation between the patch antenna arrays operating over WIMAX band.","PeriodicalId":169237,"journal":{"name":"2013 IEEE Applied Electromagnetics Conference (AEMC)","volume":"419 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":"116505137","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.2013.7045064
Yadunath Kaiprath, Saptarshi Ghosh, S. Bhattacharya, K. V. Srivastava
This paper proposes an ultra-thin polarization-independent metamaterial absorber for dual band applications. The single unit cell consists of two cave ring resonators backed by metallic plane separated by a dielectric layer. The dimensions of the structure have been optimized so that absorptions take place at two distinct frequencies 5.8 and 8.83 GHz (with absorptivities 99.1% and 99.5% respectively) operating at the FCC radar frequency spectrum. The proposed structure is more compact, consuming lesser area compared to the conventional rectangular closed-ring resonators. It is polarization-insensitive and also shows high absorption (above 80%) upto 60° for both TE and TM incidence.
{"title":"An ultra-thin polarization-independent wide-angle metamaterial absorber for dual-band applications","authors":"Yadunath Kaiprath, Saptarshi Ghosh, S. Bhattacharya, K. V. Srivastava","doi":"10.1109/AEMC.2013.7045064","DOIUrl":"https://doi.org/10.1109/AEMC.2013.7045064","url":null,"abstract":"This paper proposes an ultra-thin polarization-independent metamaterial absorber for dual band applications. The single unit cell consists of two cave ring resonators backed by metallic plane separated by a dielectric layer. The dimensions of the structure have been optimized so that absorptions take place at two distinct frequencies 5.8 and 8.83 GHz (with absorptivities 99.1% and 99.5% respectively) operating at the FCC radar frequency spectrum. The proposed structure is more compact, consuming lesser area compared to the conventional rectangular closed-ring resonators. It is polarization-insensitive and also shows high absorption (above 80%) upto 60° for both TE and TM incidence.","PeriodicalId":169237,"journal":{"name":"2013 IEEE Applied Electromagnetics Conference (AEMC)","volume":"42 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":"127828555","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.2013.7045110
A. Gorai, C. Goswami, Manimala Pal, R. Ghatak
A planar CPW-fed ultra wideband (UWB) monopole antenna with triple band notch characteristics is presented in this paper. A combination of Moore curve and Euclidean curve to create a hybrid fractal slot that is etched out from the radiator results in creating band notches centered at 5.5GHz and 8.1GHz. The band notch centered at 6.8GHz is obtained by Moore fractal slots etched from the ground planes. The impedance bandwidth of the proposed antenna covers frequency range from 2.8GHz to 12 GHz. The simulated peak gain is 4 dBi. The group delay profile is almost linear within the passband. Stable radiation patterns are observed within the operating range.
{"title":"A planar elliptical shaped UWB antenna with triple band notch characteristics using hybrid fractal slots","authors":"A. Gorai, C. Goswami, Manimala Pal, R. Ghatak","doi":"10.1109/AEMC.2013.7045110","DOIUrl":"https://doi.org/10.1109/AEMC.2013.7045110","url":null,"abstract":"A planar CPW-fed ultra wideband (UWB) monopole antenna with triple band notch characteristics is presented in this paper. A combination of Moore curve and Euclidean curve to create a hybrid fractal slot that is etched out from the radiator results in creating band notches centered at 5.5GHz and 8.1GHz. The band notch centered at 6.8GHz is obtained by Moore fractal slots etched from the ground planes. The impedance bandwidth of the proposed antenna covers frequency range from 2.8GHz to 12 GHz. The simulated peak gain is 4 dBi. The group delay profile is almost linear within the passband. Stable radiation patterns are observed within the operating range.","PeriodicalId":169237,"journal":{"name":"2013 IEEE Applied Electromagnetics Conference (AEMC)","volume":"24 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":"127972614","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.2013.7045072
L. Shafai, S. Latif
Modifying a solid conductor with multiple thin laminated conductors can significantly reduce the ohmic loss of microstrip conductors. This concept can be used in circuits and antennas where substantial conductor loss occurs. The lamination in the composite material is realized using dielectric material. The laminating dielectric thickness is smaller or of the order of the skin depth of the conductor. First, it is shown analytically that in this composite material, the power lost is less in the conductor with several laminated conductors instead of a single solid conductor having the same thickness. The concept can be used in miniaturized antennas having poor gain due to a very high ohmic loss to improve their gain and efficiency by reducing the loss using multiple laminated conductors.
{"title":"Reduction of ohmic loss in planar circuits and antennas using laminated conductors","authors":"L. Shafai, S. Latif","doi":"10.1109/AEMC.2013.7045072","DOIUrl":"https://doi.org/10.1109/AEMC.2013.7045072","url":null,"abstract":"Modifying a solid conductor with multiple thin laminated conductors can significantly reduce the ohmic loss of microstrip conductors. This concept can be used in circuits and antennas where substantial conductor loss occurs. The lamination in the composite material is realized using dielectric material. The laminating dielectric thickness is smaller or of the order of the skin depth of the conductor. First, it is shown analytically that in this composite material, the power lost is less in the conductor with several laminated conductors instead of a single solid conductor having the same thickness. The concept can be used in miniaturized antennas having poor gain due to a very high ohmic loss to improve their gain and efficiency by reducing the loss using multiple laminated conductors.","PeriodicalId":169237,"journal":{"name":"2013 IEEE Applied Electromagnetics Conference (AEMC)","volume":"118 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":"129063672","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.2013.7045055
Anshul Gupta, R. Gangwar
In this paper, the simulation study of conducting conformal strip-fed four-element linear broadside rectangular dielectric resonator antenna array is carried out using Ansoft HFSS simulation software. The Input and radiation characteristic of the proposed array has also been investigated in S-band of microwave frequencies.
{"title":"Four-element high gain conformal strip excited rectangular dielectric resonator antenna array","authors":"Anshul Gupta, R. Gangwar","doi":"10.1109/AEMC.2013.7045055","DOIUrl":"https://doi.org/10.1109/AEMC.2013.7045055","url":null,"abstract":"In this paper, the simulation study of conducting conformal strip-fed four-element linear broadside rectangular dielectric resonator antenna array is carried out using Ansoft HFSS simulation software. The Input and radiation characteristic of the proposed array has also been investigated in S-band of microwave frequencies.","PeriodicalId":169237,"journal":{"name":"2013 IEEE Applied Electromagnetics Conference (AEMC)","volume":"4 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":"132605787","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.2013.7045066
Somak Bhattacharyya, Saptarshi Ghosh, K. V. Srivastava
This paper presents an ultra-thin polarization independent metamaterial microwave absorber comprising of three concentric closed ring resonators (CRR). The unit cell sizes as well as the other geometrical dimensions like radii and widths of the rings are optimized so that absorptions take place at three distinct frequencies near to the middle of the FCC radar frequency spectrum. The proposed structure shows absorptivities of 94.1%, 99.6% and 99.4% at 5.5 GHz, 9.52 GHz and 13.8 GHz respectively. The proposed structure has been studied under oblique incidence, both for TE and TM polarization where it behaves as absorber upto 60 ° incident angles in both the cases. Due to the geometrical symmetry, the structure is found to be polarization independent absorber.
{"title":"An ultra-thin polarization independent metamaterial absorber for triple band applications","authors":"Somak Bhattacharyya, Saptarshi Ghosh, K. V. Srivastava","doi":"10.1109/AEMC.2013.7045066","DOIUrl":"https://doi.org/10.1109/AEMC.2013.7045066","url":null,"abstract":"This paper presents an ultra-thin polarization independent metamaterial microwave absorber comprising of three concentric closed ring resonators (CRR). The unit cell sizes as well as the other geometrical dimensions like radii and widths of the rings are optimized so that absorptions take place at three distinct frequencies near to the middle of the FCC radar frequency spectrum. The proposed structure shows absorptivities of 94.1%, 99.6% and 99.4% at 5.5 GHz, 9.52 GHz and 13.8 GHz respectively. The proposed structure has been studied under oblique incidence, both for TE and TM polarization where it behaves as absorber upto 60 ° incident angles in both the cases. Due to the geometrical symmetry, the structure is found to be polarization independent absorber.","PeriodicalId":169237,"journal":{"name":"2013 IEEE Applied Electromagnetics Conference (AEMC)","volume":"37 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":"133597469","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.2013.7045044
Ardhendu Kundu
Specific Absorption Rate (SAR) is a measure of the rate at which energy is absorbed by an object when exposed to an electromagnetic field. SAR evaluation at different human organs due to cell phone radiation is very common today. On the other hand, none has yet considered that the plants, fruits and crops get exposed to RF radiation from cell phone towers 24 hours a day without any shielding. Therefore, the purpose of this research paper is to evaluate SAR in apple fruit (in tree) due to radiation coming from cell phone towers in GSM bands at controlled and public exposure zones. SAR has been evaluated in an apple with CST MICROWAVE STUDIO (CST-MWS) simulator based on Finite Integration Technique (FIT).
比吸收率(SAR)是测量物体暴露在电磁场中时吸收能量的速率。由于手机辐射对人体不同器官的SAR评估在今天非常普遍。另一方面，还没有人考虑到植物、水果和农作物每天24小时都暴露在手机信号塔发出的射频辐射中，没有任何屏蔽。因此，本研究的目的是评估苹果果实(树上)在控制和公共暴露区受到GSM频段手机信号塔辐射的SAR。利用基于有限积分技术(FIT)的CST MICROWAVE STUDIO (CST- mws)模拟器对苹果的SAR进行了评估。
{"title":"Specific Absorption Rate evaluation in apple exposed to RF radiation from GSM mobile towers","authors":"Ardhendu Kundu","doi":"10.1109/AEMC.2013.7045044","DOIUrl":"https://doi.org/10.1109/AEMC.2013.7045044","url":null,"abstract":"Specific Absorption Rate (SAR) is a measure of the rate at which energy is absorbed by an object when exposed to an electromagnetic field. SAR evaluation at different human organs due to cell phone radiation is very common today. On the other hand, none has yet considered that the plants, fruits and crops get exposed to RF radiation from cell phone towers 24 hours a day without any shielding. Therefore, the purpose of this research paper is to evaluate SAR in apple fruit (in tree) due to radiation coming from cell phone towers in GSM bands at controlled and public exposure zones. SAR has been evaluated in an apple with CST MICROWAVE STUDIO (CST-MWS) simulator based on Finite Integration Technique (FIT).","PeriodicalId":169237,"journal":{"name":"2013 IEEE Applied Electromagnetics Conference (AEMC)","volume":"9 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":"122205739","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.2013.7045027
Soumyo Chatterjee, S. Chatterjee, D. R. Poddar
In this paper, a novel method has been proposed to achieve reduced side lobe level (SLL) for beam steered linear array of isotropic elements. Tschebyscheff polynomial and Particle Swarm Optimization (PSO) algorithm has been used to develop the proposed method. In the proposed method search space for PSO has been defined using Tschebyscheff polynomial for an amplitude taper beam steered linear array. PSO with the information of where to search finds the optimum excitation amplitude of the beam steered linear array to achieve reduced SLL.
{"title":"Synthesis of amplitude taper beam steered linear array using Particle Swarm Optimization and Tschebyscheff polynomial","authors":"Soumyo Chatterjee, S. Chatterjee, D. R. Poddar","doi":"10.1109/AEMC.2013.7045027","DOIUrl":"https://doi.org/10.1109/AEMC.2013.7045027","url":null,"abstract":"In this paper, a novel method has been proposed to achieve reduced side lobe level (SLL) for beam steered linear array of isotropic elements. Tschebyscheff polynomial and Particle Swarm Optimization (PSO) algorithm has been used to develop the proposed method. In the proposed method search space for PSO has been defined using Tschebyscheff polynomial for an amplitude taper beam steered linear array. PSO with the information of where to search finds the optimum excitation amplitude of the beam steered linear array to achieve reduced SLL.","PeriodicalId":169237,"journal":{"name":"2013 IEEE Applied Electromagnetics Conference (AEMC)","volume":"30 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":"128130120","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.2013.7045065
H. Baskey, M. Akhtar
This paper describes the design procedures and the electromagnetic testing of carbon black and carbon fiber-epoxy composites for their applications as electromagnetic absorbers. The designed absorber composites are fabricated and tested in the microwave frequency range using the proposed partially filled rectangular waveguide setup. The measured performance of absorber composites shows the reflection loss of at least 13 dB i.e., absorption of 95% throughout the `X' band frequency region. The minima of the reflection loss having value of 28.5 dB i.e., absorption of 99.8% is observed at 10.30 GHz for the optimized sample thickness of 2.5 mm. The wide band absorption and adhesion characteristics of the designed electromagnetic absorber composite having a metallic background makes it a potential candidate for the defense stealth applications.
{"title":"Electromagnetic design and testing of carbon black and carbon fiber-epoxy composites for defence stealth applications","authors":"H. Baskey, M. Akhtar","doi":"10.1109/AEMC.2013.7045065","DOIUrl":"https://doi.org/10.1109/AEMC.2013.7045065","url":null,"abstract":"This paper describes the design procedures and the electromagnetic testing of carbon black and carbon fiber-epoxy composites for their applications as electromagnetic absorbers. The designed absorber composites are fabricated and tested in the microwave frequency range using the proposed partially filled rectangular waveguide setup. The measured performance of absorber composites shows the reflection loss of at least 13 dB i.e., absorption of 95% throughout the `X' band frequency region. The minima of the reflection loss having value of 28.5 dB i.e., absorption of 99.8% is observed at 10.30 GHz for the optimized sample thickness of 2.5 mm. The wide band absorption and adhesion characteristics of the designed electromagnetic absorber composite having a metallic background makes it a potential candidate for the defense stealth applications.","PeriodicalId":169237,"journal":{"name":"2013 IEEE Applied Electromagnetics Conference (AEMC)","volume":"35 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":"132928524","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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