By Topic

Radio Science Conference, 2006. NRSC 2006. Proceedings of the Twenty Third National

Date 14-16 March 2006

Filter Results

Displaying Results 1 - 25 of 99
  • [Front cover]

    Publication Year: 2006 , Page(s): C1
    Save to Project icon | PDF file iconPDF (1619 KB)  
    Freely Available from IEEE
  • [Breaker page]

    Publication Year: 2006 , Page(s): 1
    Save to Project icon | Request Permissions | PDF file iconPDF (75 KB)  
    Freely Available from IEEE
  • Contributor Listings

    Publication Year: 2006
    Save to Project icon | PDF file iconPDF (63 KB)  
    Freely Available from IEEE
  • [Advertisements]

    Publication Year: 2006 , Page(s): 1
    Save to Project icon | Request Permissions | PDF file iconPDF (87 KB)  
    Freely Available from IEEE
  • Contributor Listings

    Publication Year: 2006
    Save to Project icon | PDF file iconPDF (178 KB)  
    Freely Available from IEEE
  • [Society related material]

    Publication Year: 2006 , Page(s): 1
    Save to Project icon | PDF file iconPDF (130 KB)  
    Freely Available from IEEE
  • [Society related material]

    Publication Year: 2006 , Page(s): 1
    Save to Project icon | PDF file iconPDF (363 KB)  
    Freely Available from IEEE
  • Honored Egyption poineers of radio science in NRSC2006

    Publication Year: 2006
    Save to Project icon | PDF file iconPDF (51 KB)  
    Freely Available from IEEE
  • Information for authors

    Publication Year: 2006 , Page(s): 1 - 2
    Save to Project icon | PDF file iconPDF (723 KB)  
    Freely Available from IEEE
  • Table of contents

    Publication Year: 2006 , Page(s): 1 - 6
    Save to Project icon | PDF file iconPDF (653 KB)  
    Freely Available from IEEE
  • [Breaker page]

    Publication Year: 2006 , Page(s): 1
    Save to Project icon | Request Permissions | PDF file iconPDF (40 KB)  
    Freely Available from IEEE
  • Composite and Hybrid Dielectric Resonator Antennas: Recent Advances and Challenges

    Publication Year: 2006 , Page(s): 1 - 7
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2389 KB) |  | HTML iconHTML  

    Dielectric resonator antenna (DRA) has been proposed recently as a viable new way to build antenna in view of some of the advantages they offer. One recent trend in DRA research focuses on using composite and hybrid structures. Some considerable investigations are already underway showing quite interesting and significant features. A brief review of the topic is presented in this article. A general discussion comparing a microstrip patch and a DRA is provided in the beginning. Some state-of-the-art developments and associated challenges in the DRA design and applications are also discussed View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • MEMS For Wireless: FBAR and LiMMS

    Publication Year: 2006 , Page(s): 1 - 6
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (3181 KB) |  | HTML iconHTML  

    This paper describes technology of micro-electro-mechanical systems (MEMS) in the field of mobile handsets, which uses the single-mode CDMA product of 1800-1900 MHz range. In order to gain the market penetration, the HP Labs uses the FBAR project, where it reduces the size and weight of the RF resonators, filters and duplexers. Thus, the brief analysis illustrates that the FBAR, as a miniaturization technology for filters and resonators not only has functional dimension of micrometers but also the fabrication method is similar to that of the mass-market integrated-circuit fabrication. In the liquid metal micro switch (LiMMS), we employ a liquid-liquid contact to address the handset failure. The switching operation is achieved by forming a gap in the liquid metal using gas expansion. LiMMS also has good RF performance, thus the micro-machined version developed by California achieves promising parameters of 0.2 dB insertion loss at 2 GHz of below 0.3 ms switching time, switching power of 0.3 W for 2.5 microsecond duration View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Nuclear Power and the Environment Prospects and Challenges

    Publication Year: 2006 , Page(s): 1 - 32
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (4927 KB) |  | HTML iconHTML  

    World wide there were 441 operating nuclear power plants (NPPs) at the end of 2002 supplying 16 percent of global electricity generation, cumulative operating experience now stands at over 10,000 reactor years. The most significant recent trend has been that of steady increases in availability factors, without such improvement in availability factors, nuclear power would not have maintained its 16% share of global electricity. Some 83% of nuclear capacity is concentrated in industrialized countries. By contrast, almost 2 billion people in developing countries remain without reliable energy supplies, a major factor in their aspirations for social and economic development. Nuclear power can be considered the only source that can provide electricity on a large scale with comparatively minimal impact on the environment. But any major future expansion in the use of nuclear power will depend heavily on the innovation in reactor and fuel cycle technology. Innovation should ensure that new reactor and fuel cycle technologies incorporate inherent safety features, proliferation resistant characteristics, and reduced generation of waste, consideration should be given to physical protection and other characteristics that will reduce the vulnerability of nuclear facilities and materials to theft, sabotage and terrorist acts. In this paper consideration will be given to economic competitiveness, safety, waste management, proliferation resistance, health effects, and sustainable development and environmental protection, the nuclear innovation efforts and the international collaboration will be highlighted View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • [Breaker page]

    Publication Year: 2006 , Page(s): 1
    Save to Project icon | Request Permissions | PDF file iconPDF (62 KB)  
    Freely Available from IEEE
  • Miniturized E-Shaped Dual Band PIFA on FR4 Substrates

    Publication Year: 2006 , Page(s): 1 - 6
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1686 KB) |  | HTML iconHTML  

    A novel design of compact planar inverted F-antenna (PIFA) is proposed for dual band resonant frequencies. The antenna is designed and fabricated on FR4 cheap substrates with dielectric constants epsivr=4.7, respectively. Over 95% reduction in the antenna size is achieved from conventional lambda0/4 rectangular PIFA resonating at same frequencies. This is done by implementing two oppositely shorting capacitive straps under the radiating surface. Dual band operation is achieved by inserting two parallel slots on the edges of the PIFA radiating surface forming an E-shape. In this case, the center wing resonates at the higher frequency while the two side wings resonate at the lower frequency. The antenna resonance frequencies on FR4 substrate are 1.07 GHz and 2.77 GHz with areas' reduction ratios of 97% and 81% for the lower and upper resonance frequencies, respectively. The antenna size on FR4 substrate is 13times11times8 mm3. The antenna directivity is 3.73 with radiation efficiency 97%. The radiation pattern has acceptable shape with low cross polarization in both resonances and at both E-plane and H-plane directions View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Control of Rectangular Dielectric Resonator Characteristics by Ground Plane Shape

    Publication Year: 2006 , Page(s): 1 - 9
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2971 KB) |  | HTML iconHTML  

    Finite-difference time-domain (FDTD) method is used to illustrate the characteristics of strip-fed rectangular dielectric resonator antenna (DRA) over a ground plane with different shapes. The rectangular DRA is investigated on infinite ground plane, finite perfect electric conductor (PEC) ground plane, corrugated ground plane and electromagnetic band gap (EBG) ground plane. The input impedance and the radiation patterns in different planes are calculated and compared with a finite flat PEC ground plane View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Radial Basis Function Neural Networks for Filling the MoM Impedance Matrix

    Publication Year: 2006 , Page(s): 1 - 8
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1194 KB) |  | HTML iconHTML  

    In this paper radial basis function neural network (RBF-NN) used for filling the method of moments (MoM) impedance matrix of several configuration of wire antennas. Four radial basis function neural networks (RBF-NNs) are trained to calculate the impedances of two elements consist of four monopoles. The mutual impedance between the two elements is the sum of outputs of the four RBF-NNs. The RBF-NN model is applied to the analysis of the straight dipole, two element array, circular array, wire-grid corner reflector, square loop, and square spiral antenna View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Investigations on Novel Configurations of Triangular Fractal Microstrip Patch Antenna

    Publication Year: 2006 , Page(s): 1 - 10
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (3162 KB) |  | HTML iconHTML  

    The first three iterations of Sierpinski Gasket and Koch Island fractal microstrip patch antenna with a probe feeding on a single microstrip substrate are studied. Predictable multiband characteristics is explained. A new design of fractal multiband antenna based on both the Sierpinski Gasket and Koch Island is presented. Antenna fabrication is done with photolithographic technique. Experimental measurements are compared with numerical results obtained using the method of moments implemented in the ready-made Zeland IE3D version 10.0 simulator software. Comparison between results verifies the new design idea and characteristics View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Modal Analysis of Two-Dimensional Magneto-Dielectric Grating Slab

    Publication Year: 2006 , Page(s): 1 - 9
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1947 KB) |  | HTML iconHTML  

    Fast and efficient vectorial modal analysis of a 2-D magneto-dielectric grating structure is presented. This modal analysis is combined with the generalized scattering matrix to obtain the transmission and reflection coefficients of multilayered 2-D magneto-dielectric grating slabs. The accuracy of this technique is verified with previously published results obtained by using method of moment View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Microstrip Antenna For Detecting Buried Land Mines

    Publication Year: 2006 , Page(s): 1 - 6
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1151 KB)  

    Two patch array antennas have been proposed for detection of buried land mines using the mutual coupling effect. Mutual coupling among the edges of a patch or among the edges or nearby patches can influence the performance of microstrip antennas and arrays. The finite-difference time-domain method (FDTD) is used. The patch array antennas (sensor) have been simulated to detect various types of targets (nylon plate, stycast plate, and metal plate targets) in different types of soil properties View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Neural Network-Based CAD Model for the Design of Hemispherical Dielectric Resonator Antenna with a Concentric Conductor

    Publication Year: 2006 , Page(s): 1 - 7
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1226 KB) |  | HTML iconHTML  

    Radial-basis function neural network (RBF-NN) is presented for calculating the dimensions of the probe-fed hemispherical dielectric-resonator antenna (DRA) with a concentric conductor. Simple formulas for the resonant frequency and the Q-factor are used. The RBF-NN is trained to calculate the resonant frequency and the Q-factor of the DRA antenna, when the inputs are the conductor radius and the relative dielectric constant. The RBF-NN is also trained to calculate the conductor radius when the resonant frequency and the Q-factor are known View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Evanescent Wave Coupling Between Optical Fiber and Planar Optical Waveguide

    Publication Year: 2006 , Page(s): 1 - 6
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1027 KB) |  | HTML iconHTML  

    Transverse coupling between single mode fiber and single mode planar waveguide is analyzed for the first time-to the authors' knowledge-by an improved coupled mode theory (ICMT). The coupling is established via the evanescent part of the modal field propagating in the fiber which penetrates the slab waveguide. The main parameters that characterize the coupling process are calculated. A comparison between the results of the ICMT and those obtained by the usual coupled mode theory reveals an improvement in the accuracy by almost twenty percent View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Modified Analysis of Traveling Wave Modulator and Active Directional Coupler with Coplanar Electrodes

    Publication Year: 2006 , Page(s): 1 - 12
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (3755 KB) |  | HTML iconHTML  

    This algorithm presented a simple analysis of traveling wave modulator (TWM) and active directional coupler, ADC, with coplanar electrodes. In this algorithm, the electrooptic material, EOM, is treated as anisotropic-homogenous material before and after the applied electric field by using the average values of the d.c electric field components, Exav and Eyav, instead of the varying components, Ex(x,y) and Ey(x,y). In this algorithm, for TWM, the mismatch velocity between microwave and optical waves has been improved by controlling the external drive voltage, to increase the optical effective refractive index, LiNbO3 is the best EOM. Also, for ADC, two waveguides propagation constants, coupling coefficient, C, and transferred power between ADC waveguides are controlled by an applied voltage C between two similar and dissimilar EOMs is evaluated. Two similar EOMs act as dissimilar materials with different orientation of crystallographic axes. Excellent pair of EOMs depend upon electrodes configurations. This algorithm permits finding the effect of all modulator and coupler parameters on the performance of them View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Antenna Selection Algorithms in Correlated Fading MIMO Channels

    Publication Year: 2006 , Page(s): 1 - 8
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1784 KB) |  | HTML iconHTML  

    This paper studies the performance of existing receive antenna selection algorithms in spatially correlated fading MIMO channels. The antenna subset is selected based on maximizing the channel capacity. First the most recently proposed algorithms, which are dedicated to i.i.d channel, are revisited and investigated. Then, we apply these algorithms to the case of correlated fading channel. The performance of each algorithm is evaluated and compared in terms of the outage characteristics for different scenarios regarding the angle spread and the required number of antenna elements. Finally, we compare between our results and another algorithm dedicated to correlated channels, namely the correlation selection algorithm View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.