2007 IEEE Applied Electromagnetics Conference (AEMC)最新文献

{"title":"Research on fractal antenna and use of soft computing technique towards its development at Jadavpur University, Berhampur University and the University of Burdwan","authors":"R. Ghatak, D. Poddar, R. K. Mishra","doi":"10.1109/AEMC.2007.4638059","DOIUrl":"https://doi.org/10.1109/AEMC.2007.4638059","url":null,"abstract":"This paper summarizes fractal antenna designs that have improved performance over conventional fractal antenna. A real coded genetic algorithm code in MATLABTM is developed that plugs on to electromagnetic simulation software IE3DTM to search for a suitable design of a Sierpinski gasket microstrip patch antenna. The same code is further modified to optimize a Sierpinski carpet monopole antenna with a coplanar wave-guide feed.","PeriodicalId":397229,"journal":{"name":"2007 IEEE Applied Electromagnetics Conference (AEMC)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124097152","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}

{"title":"Applications of artificial intelegence techniques in microstrip component and antenna design at Jadavpur University in the present decade","authors":"B. Gupta, S. Chakraborty, P. Mukherjee, S. Biswas","doi":"10.1109/AEMC.2007.4638066","DOIUrl":"https://doi.org/10.1109/AEMC.2007.4638066","url":null,"abstract":"Artificial intelligence techniques viz. artificial neural networks (ANN) and genetic algorithms (GA) etc. are well-known in the field of soft computing to solve computationally intensive problems. Researches at Jadavpur University by the authors focussed on applying these techniques to overcoming the limitations of microstrip components and antennas in terms of several useful parameters like band width, power handling capacity etc. Factors of influence experienced and innovations made in these recent works are enlisted in brief.","PeriodicalId":397229,"journal":{"name":"2007 IEEE Applied Electromagnetics Conference (AEMC)","volume":"15 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133944239","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}

{"title":"Performances of two dual-frequency microstrip antennas for GPS and Bluetooth communications","authors":"J. Ghosh, J. S. Roy","doi":"10.1109/AEMC.2007.4638001","DOIUrl":"https://doi.org/10.1109/AEMC.2007.4638001","url":null,"abstract":"In this paper, the performances of a short-circuited microstrip antenna and a proximity coupled microstrip antenna are compared at the frequency bands of wireless communications using global positioning system (GPS) and Bluetooth. Both the antennas are able to generate dual frequencies. Simulated results are verified by measurement.","PeriodicalId":397229,"journal":{"name":"2007 IEEE Applied Electromagnetics Conference (AEMC)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115050669","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}

{"title":"Radar Cross Section reduction using plasma blobs: 3-D Finite Difference Time Domain simulations","authors":"Bhaskar Chaudhury, Shashank Chaturvedi","doi":"10.1109/AEMC.2007.4638040","DOIUrl":"https://doi.org/10.1109/AEMC.2007.4638040","url":null,"abstract":"Bistatic scattering cross-section or radar cross section (RCS) of a flat plate covered with cold, collisional, steady-state, inhomogeneous plasma blobs have been studied in this paper. We have performed 3-D finite difference time domain (FDTD) simulations for this study which provides a detailed spatio-temporal evolution of electromagnetic fields. The simulation has been performed using a 10 GHz sinusoidal wave for the case of vertical polarization. Two configurations have been studied, firstly a plate covered with a single blob and secondly the same plate covered with several blobs of smaller dimension. The simulation shows several interesting results and confirms that plasma absorber can be successfully used for reducing the scattering cross section of a plate for almost all azimuthal angles. To our knowledge, this is the first detailed three-dimensional computation of bistatic RCS of plasma shielded objects.","PeriodicalId":397229,"journal":{"name":"2007 IEEE Applied Electromagnetics Conference (AEMC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115713664","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}

{"title":"The selection of MIMO antennas in a fading scenario and performance evaluation of MIMO and SISO systems in an indoor office environment","authors":"C. Ghosh, I. S. Misra","doi":"10.1109/AEMC.2007.4638006","DOIUrl":"https://doi.org/10.1109/AEMC.2007.4638006","url":null,"abstract":"In broadband wireless communication system the multiple- input multiple-output (MIMO) antenna pattern improves wireless communication system substantially with using adaptive techniques like power allocation and antenna selection. In multiple input multiple output system, a large number of antennas are used in the transmitting and receiving end as well. So a multiple number of RF chains are employed where each RF chain consists of analog to digital converter (ADC), preamplifier, mixer, power amplifier, automatic gain control (AGC), modulator, low pass filter (LPF), digital to analog converter (DAC) etc. In this paper, it has been discussed how the RF chain should be utilized in the receiving end so that without using all chains simultaneously the performance of the MIMO system will be better. Further more, the performance evaluation of MIMO and SISO antenna system has been done experimentally in an indoor office environment.","PeriodicalId":397229,"journal":{"name":"2007 IEEE Applied Electromagnetics Conference (AEMC)","volume":"235 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115660644","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}

{"title":"A simple analytical approach to study the bound Plasmon Polariton modes guided by a metallic wire of rectangular cross section","authors":"S. Chattopadhyay, P. K. Saha","doi":"10.1109/AEMC.2007.4638041","DOIUrl":"https://doi.org/10.1109/AEMC.2007.4638041","url":null,"abstract":"Propagation characteristics of Surface Plasmon Polariton (SPP) modes supported by thin metal films of rectangular cross-section have been determined through matching of trial field solutions on the boundary. Though simple and approximate, the method yields results that show good agreement with those obtained by conventional effective index and numerical methods. As an added benefit, one also obtains explicit expressions for the field components from this procedure.","PeriodicalId":397229,"journal":{"name":"2007 IEEE Applied Electromagnetics Conference (AEMC)","volume":"48 11","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121011714","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}

{"title":"An efficient algorithm for analyzing microstrip structure using macro-basis-function and progressive method","authors":"B. Ooi, M. Leong, H. Hristov, R. Feick, I. Ang, Z. Zhong, C. Sing","doi":"10.1109/AEMC.2007.4638047","DOIUrl":"https://doi.org/10.1109/AEMC.2007.4638047","url":null,"abstract":"An efficient algorithm using macro-basis-function (MBF) and progressive method has been proposed to analyze microstrip structure. The mutual coupling effects of all the elements are considered in each MBF by applying progressive approach. The algorithm consists of two stages. The first stage is to determine the initial current on the structure. The second stage is to calculate the elements one by one while still taking into account the mutual coupling effect among all the currents. Two examples are given to test the validity and efficiency of the proposed method. Numerical results from the proposed method have excellent agreements with those from the conventional method of moments.","PeriodicalId":397229,"journal":{"name":"2007 IEEE Applied Electromagnetics Conference (AEMC)","volume":"206 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125879115","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}

{"title":"Performance of space durable polymeric nano composite under electromagnetic radiation at Low Earth Orbit","authors":"S. Bhowmik, R. Benedictus","doi":"10.1109/AEMC.2007.4638050","DOIUrl":"https://doi.org/10.1109/AEMC.2007.4638050","url":null,"abstract":"It is well known that during long mission at low Earth orbit (LEO) as well as geosynchronous Earth orbit (GEO), electromagnetic radiation such as proton, gamma rays, alpha particles etc. creates severe damages to space electronics equipment as well as structural materials of spacecraft. In this context, present study investigates the rationale to developing space materials which could be useful as shielding material for spacecraft when spacecraft is subject to intense radiation at low Earth orbit (LEO). It is noted that several international space agencies such as National Aeronautics and Space Administration (NASA), European Space Agency (ESA) have launched several programs to investigating materials and techniques for shielding of spacecraft structure as well as electronic equipments involved in long-term missions. Usually high-mass density materials of high atomic number, are not good choices for shielding the spacecraft because, when struck by the primary positive ions, the nuclei of these materials fragment and produce a shower of secondary radiation that includes more charged particles, photons, and neutrons, and the thicknesses of heavy shielding material necessary to stop these becomes excessive from a weight standpoint. Therefore, new shielding materials that not only block and/or fragment more radiation than aluminium - the material currently used to build most spacecraft structures but also lighter than aluminium is polyethylene which is a good shielding material because it has high hydrogen content and hydrogen atoms are good at absorbing and dispersing radiation. However, longer mission under electromagnetic radiation, mechanical properties of the polymer deteriorate. Therefore, one of several novel material developments that are currently being researched is nano reinforced polyethylene and proper selection of nano particles in terms of physicothermal and theromechanical properties are of priorities. It is proved that at longer mission at LEO, polyethylene based shielding materials are not so useful in terms of physicothermal and thermomechanical properties. Therefore, attention is given to find better shielding materials and one such material is space durable polymer such as polybenzimidazole (PBI) having higher service temperature and also having excellent properties to resist high energy radiation. Therefore, this paper highlights future of polymeric nano composite based on these polymers with dispersion of appropriate nano particles such as carbon nano fibre and calcium and that could be a solution for materials of space radiation shielding for long mission at LEO.","PeriodicalId":397229,"journal":{"name":"2007 IEEE Applied Electromagnetics Conference (AEMC)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123127819","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}

{"title":"RF coupler and frequency tuning system design for RFQ cavity of VEC-RIB","authors":"H. Pandey, V. Naik, A. Chakrabarti","doi":"10.1109/AEMC.2007.4638057","DOIUrl":"https://doi.org/10.1109/AEMC.2007.4638057","url":null,"abstract":"Variable energy cyclotron centre (VECC) is presently developing an isotope separator on-line (ISOL) postaccelerator type of radioactive ion beam (RIB) facility. A 33.7 MHz, 1.7 meter long heavy-ion radio frequency quadrupole (RFQ) linear accelerator has recently been commissioned. The design of loop coupler for RF power feeding and also of a tuner for fine frequency tuning of this RFQ cavity are presented.","PeriodicalId":397229,"journal":{"name":"2007 IEEE Applied Electromagnetics Conference (AEMC)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127998682","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}

{"title":"Broadband impedance matching technique for microwave amplifiers","authors":"S. Khah, P. Singh, S. Rabra, R. Saxena, T. Chakarvarty","doi":"10.1109/AEMC.2007.4638055","DOIUrl":"https://doi.org/10.1109/AEMC.2007.4638055","url":null,"abstract":"Impedance matching for microwave amplifiers have been investigated extensively using different methods such as stub matching for broadband applications. In the present communication broadband impedance matching technique has been developed by combining the amplifier module with series microstrip transmission lines with optimum characteristic impedance (Zc) and electrical length. Resistive loading are used at both the source and load terminals to ensure unconditional stability. Different variable parameters like resistance values, characteristics impedance and length of the transmission line are used to design the amplifier. . The analysis of the design circuit has been carried out using multiplication of transmission matrices. This unique method hitherto unpublished can be used as a broadbandning technique for designing microwave amplifiers.","PeriodicalId":397229,"journal":{"name":"2007 IEEE Applied Electromagnetics Conference (AEMC)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132146761","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}