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Applied Electromagnetics Conference (AEMC), 2011 IEEE

Date 18-22 Dec. 2011

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Displaying Results 1 - 25 of 149
  • A single band notched CPW antenna design

    Publication Year: 2011 , Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (373 KB)  

    A single band notched Coplanar Waveguide Antenna using complementary split ring resonators is proposed and investigated which is working on WLAN and C band applications. The proposed antenna can reject single frequency band by etching Circular Split Ring Resonators (CSRRs) in the radiating patch. The single stop band of the proposed CPW antenna are 4.6GHz-5.3GHz with a reference level of Sn = -5 dB. The center frequency of the first notched band is 5.0GHz at which the wireless WLAN (Upper WiFi) service is assigned. The proposed antenna operates from 2482 MHz to 2984 MHz for voltage standing wave ratio (VSWR) less than 2, except one frequency notched band of 4.6GHz-5.3GHz. View full abstract»

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  • Wideband dual frequency antenna for WLAN applications

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (434 KB)  

    A wideband antenna for dual resonant frequency operation is presented. It is a basic rectangular shape antenna with two triangular sharp notches and air as a dielectric medium. The impedance bandwidth of the antenna is 15.97%. The calculated 3dB pattern bandwidth is 15.96% and maximum total field gain is 9.14 dB. The experimental results are in good agreement with the calculated results. View full abstract»

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  • Modified CPW fed band-notched ultra-wideband antenna

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (413 KB)  

    A planner, square monopole ultra-wideband (UWB) antenna which is operated successfully on whole UWB range (3.1–10.6 GHz) is proposed with CPW feeding. The antenna has compact size of 28.5 mm × 18 mm × 1.6 mm with substrate relative permeability 3.2. Using Coplanar Waveguide (CPW) resonator, band-notched characteristics is achieved between 5.4–6.3 GHz to reduce the interference with WLAN systems working at 5.8 GHz. A good impedance matching is obtained in 3.1–15 GHz with reflection less than −10 db (VSWR < 2) except rejected band. View full abstract»

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  • Scattering by an infinite elliptic dielectric cylinder under oblique illumination

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (573 KB)  

    In the present work the electromagnetic scattering by an infinite elliptic dielectric cylinder is studied, under oblique illumination, with the use of the separation of variables method. The scattered and the induced fields are represented via hybrid waves due to the oblique incidence. The formulation supports media described by different wavenumbers and therefore the orthogonality relations for the elliptical wavefunctions cannot be applied. These two facts lead to coupled linear systems involving both polarization components. Numerical results are given for the scattering cross sections for various values of the parameters. The method is exact and can be regarded as an alternative to the ones that are based on integral equations, for the problem studied here. View full abstract»

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  • Surface wave reduction in circularly polarized microstrip patch antenna mounted on textured pin substrate

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (544 KB)  

    In this paper the work is presented on improvement of radiation characteristics in circularly polarized rectangular patch antenna achieved by designing it on textured pin substrate. A microstrip antenna mounted on textured pin surface has been developed that is characterized by high surface impedance. This surface does not support propagation of surface waves, but reflects these waves in the forbidden band gap. The cylindrical metallic obstacles embedded in the substrate are placed in a square grid array in the proposed design. The parametric study of the designing parameters for the textured pin surface like obstacle spacing and radius of wires has been done. The design has enabled the improvement of -15.7029 dB in isolation, gain enhancement by around 2 dB and radiation efficiency improvement of around 43% along with this axial ratio is obtained to be around 1 which enables it to be appropriately used in satellite communication where circular polarization and superior radiation characteristics are two major requirements. View full abstract»

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  • Spiral inductors for V-band wireless ICs

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (597 KB)  

    This paper presents spiral inductors for V-band (50GHz-75GHz) wireless Integrated Circuits (ICs). The effects of variation of various design parameters of spiral inductors viz. number of turns, internal radius and width & spacing of metal turns on self resonant frequency and quality factor of inductor are studied. Based on the observations spiral inductor for V-band wireless ICs has been designed. The proposed 1.5 Turn spiral inductor, which has an internal radius of 11μm and spiral & underpass metal thicknesses of 0.3μm, gives an inductance of 6.6nH with a quality factor of 7.3 at 60GHz. View full abstract»

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  • Microwave study of planar honeycomb EBG lattice with hexagonal basis points

    Publication Year: 2011 , Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (421 KB)  

    Hexagonal basis for EBG lattice structures have been reported due to their capability to accommodate maximum numbers of neighbors resulting closed packed array of hexagonal patches ideal for steerable devices for navigation. Present work reports the analysis of hexagonal basis in honeycomb metallo-dielectric lattice structure in Ka band. Hexagonal EBG are designs at λg/6 wavelength and are fed by microstripline from the back plane. Simulation and experiments shows that the stop band characteristics is observed from 32 GHz to 42 GHz frequency range. View full abstract»

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  • High Q ceramic dielectric resonator with planar spiral slot coupling

    Publication Year: 2011 , Page(s): 1 - 2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (437 KB)  

    A high quality factor (Q) unshielded ceramic dielectric resonator fed by a tapered coplanar waveguide and coupled through spiral slot structure designed at 8.5 GHz on RT-Duroid substrate is reported in this letter. Experimental Q × f obtained by using polycrystalline ceramics of CaTiO3-NdAlO3 (CTNA) and Ba(Zn1/3Ta2/3)O3 (BZT) dielectric pucks are 18,244.06 GHz and 72,055.20 GHz respectively. Results of the planar coupling method to DR are compared with the quality factors obtained by using cavity method for same dielectric samples. View full abstract»

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  • A complete user adaptive antenna tutorial demonstration: A GUI based approach using JAVA and MATLAB® interfacing

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (702 KB)  

    This paper is aimed at creation of an easy to use Antenna Graphical User Interface (GUI) Tutorial Demonstration using JAVA in BlueJ environment which provides the user with ample opportunity to feed desired input parameters and to study the basic antenna patterns and parameters according to the inputs using MATLAB® interfacing. It also presents three dimensional physical appearances using the JAVA3D utility. View full abstract»

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  • Compact filter using coupled metamaterial mushroom resonators with corner vias

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (528 KB)  

    In this paper, it is shown that the application of metamaterial resonators to the design of planar microwave filters provides a high level of miniaturization. Specifically, mushroom structure is used to synthesize microwave filters using the coupling coefficient approach. It is also shown that by changing the position of the metallic via in the mushroom cell from its center to corner, the resonance moves towards lower frequencies. This allows an easy structure size reduction which is critical in many applications. The magnetic and electric nature of the coupling coefficient is analyzed in detail. Finally, a bandpass filter operative at 2.46 GHz is simulated in ADS Momentum and also fabricated. The measured results show that the filter has an insertion loss less than 1.5 dB and bandwidth of 400 MHz with 15 dB rejection at 2.46 GHz. The dimensions of the experimental filter are 2.4 mm × 3.0 mm × 1.27 mm. View full abstract»

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  • Design of circular/triangular patch microstrip antennas using a single neural model

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (366 KB)  

    An efficient and quick approach based on artificial neural networks (ANN) is being applied on different patches of microstrip antennas since last one decade. Different scientists have proposed different neural models for analyzing the different types of microstrip patches like rectangular, triangular, square, circular etc. whereas few models have also been proposed for designing rectangular, triangular and square patches. But in the available literature of microstrip antennas with neural networks no single model has been proposed till date firstly for calculating the radius of the circular patch microstrip antenna (CPMSA) and secondly for calculating more than one parameter like radius of the CPMSA and side-length of the equilateral triangular patch microstrip antenna (ETMSA) simultaneously. In this paper authors have proposed a multi-layered perceptron feed forward neural network model for calculating the radius/side-length of the circular patch/triangular patch microstrip antennas simultaneously. The model has also been validated on some mathematically generated datasets that are not included in training or testing of the model. The results obtained by the proposed model are in conformity and very good in agreement with the experimental results given in the literature. View full abstract»

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  • In-vivo dielectric characterization of prokaryptic Subsystems using cavity perturbation technique

    Publication Year: 2011 , Page(s): 1 - 2
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (381 KB)  

    This paper present a dielectric characterization technique to characterize biological materials without extracting them from their parent cells. We calculated the dielectric constant of chlorophyll without extracting it from Spirulina Plantensis using this technique. View full abstract»

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  • Analysis of waveguide junctions using mode matching technique

    Publication Year: 2011 , Page(s): 1 - 4
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (885 KB)  

    This paper presents a mode matching technique for solving the waveguide junction problems. Some closed-form integration expressions for reaction matrix, which aids in efficient implementation of the codes for junction analysis, have been derived. Generalized MATLAB codes have been implemented to study the scattering parameters for symmetric circular waveguide junctions and for symmetric or asymmetric rectangular waveguide junctions. Computed results have been verified with simulation in Ansoft HFSS and close match is obtained. View full abstract»

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  • IEEE Applied Electromagnetics Conference - Welcome to 2011 IEEE AEMC

    Publication Year: 2011 , Page(s): 1
    Save to Project icon | Request Permissions | PDF file iconPDF (268 KB)  
    Freely Available from IEEE
  • Organising committee

    Publication Year: 2011 , Page(s): 1
    Save to Project icon | Request Permissions | PDF file iconPDF (433 KB)  
    Freely Available from IEEE
  • Degradation of on board antenna performances by re-entry plasma during supersonic or hypersonic re-entry of flight vehicles and its mitigation technique by application of d.c magnetic field

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (536 KB)  

    Ionization of neutral air molecules and heat shield ablation are the prime sources for generation of non-uniform and non-equilibrium plasma layers around re-entering supersonic or hypersonic missile liked flight vehicles. The ionized plasma layer not only reflects and attenuates the propagating electromagnetic (e.m) wave at certain concentration of electrons but it also degrades the on board antenna performances and produces very poor antenna efficiency, input impedance mismatch and undesired nulls in the desired radiation patterns-which results in RF black out during re-entry. This paper presents the analysis of degradation of on board antenna performances caused by the non-magnetized re-entry plasma and its mitigation technique at transmission frequency below the plasma resonant frequency by the application of suitably strength d.c magnetic field in the direction of on board dipole antenna radiation. View full abstract»

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  • Reflector based fat monopole UWB antenna for impulse radar application

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (938 KB)  

    UWB antennas with a capability of radiating narrow time domain pulses is of great interest for short-range Impulse radar applications like through wall surveillance, ground penetrating radar, etc. This paper discusses design, analysis and measurement of a reflector based fat monopole antenna. The antenna was analyzed using Finite time domain solver to estimate the far zone Electric field for a Gaussian excitation. The important characteristics measured for this antenna is; bandwidth 620 MHz-25 GHz more than 190%. The dispersion characteristics of the antenna were evaluated by measuring transmission coefficient using two similar antennas in an anechoic chamber. Phase linearity and flat group delay across the stated band ascertain its pulse fidelity property and make it a suitable choice for Short Range Impulse Radar. View full abstract»

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  • Stacked patch antenna design using ANN based BFO

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (527 KB)  

    This paper proposes the design aspects of dual resonance stacked patch antenna using the optimization feature of Bacteria Foraging Optimization (BFO) algorithm and function mapping feature of Neural Networks (NNs). At first, a NN was trained to learn the working frequencies of the stacked patch antenna for its different dimensional parameters. In the next phase, this trained NN was embedded inside the optimization loop of an optimizer working on BFO principle, to calculate the design dimensions of the antenna for user input frequencies. BFO, being new to microwave community, its capability has to be verified for microwave applications. The results obtained from the developed methodology were cross checked with simulations as well as with experimental verifications. View full abstract»

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  • Broadband dual linear antenna with omni directional coverage

    Publication Year: 2011 , Page(s): 1 - 4
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (362 KB)  

    In this paper, design and development of a broadband dual linearly polarized antenna is presented with measured results. The operating frequency range of proposed antenna is 1.15GHz to 2.1GHz. The radiation patterns of the antenna are omni directional in azimuth plane for vertical as well as horizontally polarized waves for vertical mounting of the antenna. Antenna structure consists of a circular array of four loops connected in parallel and placed in horizontal plane and one dipole connected in shunt to above arrangement and placed in vertical plane. The antenna parameters related to impedance bandwidth and radiation characteristics are studied and these parameters are presented as measured results. View full abstract»

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  • Performance analysis of a compact directional monopole antenna

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (138 KB)  

    In this paper, a compact directional monopole antenna is presented. Directional pattern is achieved by loading an electrically dense material onto the monopole antenna. Extensive measurements were carried out for the loaded monopole antenna to achieve directional pattern along the axis of the monopole. View full abstract»

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  • Radiation characteristics of partial height curved iris excited centered slot X-band radiator

    Publication Year: 2011 , Page(s): 1 - 4
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (412 KB)  

    Centered broadwall slot with curved partial height iris is analyzed in this paper. Slot length is optimized for finding out the maximum realized gain by varying iris depth in transverse direction. Maximum of 4.92dB realized gain is achieved with 15mm slot length with a reduction in operating range of iris. Slot voltage justifies the operating bandwidth of iris perturbation condition. View full abstract»

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  • Design of cross-slot coupled microstrip antenna using self adaptive differential evolution

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (411 KB)  

    In this paper, multi-objective design of an aperture coupled circularly polarized microstrip patch antenna, excited by a cross slot, is presented where an advanced version of differential evolution, namely, self adaptive differential evolution is used. Further the performance of this new algorithm is compared with normal differential evolution. Optimization is carried out with respect to both impedance matching and axial ratio bandwidth. View full abstract»

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  • Sidelobe level reduction of aperiodic planar array using an improved invasive weed optimization algorithm

    Publication Year: 2011 , Page(s): 1 - 4
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (350 KB)  

    This paper presents a procedure of reducing sidelobe level (SLL) of aperiodic planar array using an improved invasive weed optimization (IWO) algorithm that uses roulette wheel based reproduction. The proposed roulette wheel IWO (RW-IWO) algorithm uses roulette wheel to decide the number of seeds generated by each plant. RW-IWO is applied on standard benchmark functions. Benchmarking shows that RW-IWO gives better performance in terms of mean and standard deviation of optimal solution in comparison to classical IWO and the modified IWO proposed in [1]. Further, in contrary to classical IWO, RW-IWO produces the same number of seeds in each generation and thereby makes coding of RW-IWO much easier compared to coding of classical IWO. When RW-IWO is applied to SLL reduction of 80 element planar array of 9.5λ×4.5λ aperture, we obtained 4.41 dB improvement over the result presented in [2]. View full abstract»

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  • A novel small UWB antenna using new fractal-like geometry

    Publication Year: 2011 , Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (764 KB)  

    In this paper a novel miniaturized ultra-wideband antenna is presented. Using a new fractal-like geometry, dimensions of the antenna are reduced by more than 50%. The proposed fractal-like geometry is implemented on a microstrip-fed planar circular disk monopole antenna. A 10dB return loss bandwidth of final design is 9.58GHz that covers the frequency range of 2.57 to 12.15GHz, having satisfactory radiation properties and good gain. By increasing the iteration number of fractal-like structure, the lower-edge frequency for VSWR of 2 and the first resonant frequency may further be decreased. View full abstract»

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  • Radiation pattern synthesis of linear antenna arrays by amplitude tapering using Genetic Algorithm

    Publication Year: 2011 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (461 KB)  

    In this paper, the method of imposing nulls and side lobe suppression in the radiation pattern of an antenna array is discussed using Real Coded Genetic Algorithm (RGA). Linear symmetric antenna array is considered. The GA adjusts the excitation amplitude of each radiating element to impose a null in the desired direction. MATLAB is used to code GA in order to facilitate the realization. Various simulated results are presented by considering particular one and two desired nulls. View full abstract»

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