Browsing Open Access Journals by Issue Date
Now showing items 21-40 of 831
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Ad Hoc Network Hybrid Management Protocol Based on Genetic Classifiers
(Scientific Research Publishing, 2010-10)The purpose of this paper is to solve the problem of Ad Hoc network routing protocol using a Genetic Algorithm based approach. In particular, the greater reliability and efficiency, in term of duration of communication ... -
Resonant Length Formulations for Dual Band Slot Cut Equilateral Triangular Microstrip Antennas
(Scientific Research Publishing, 2010-10)The dual band equilateral triangular microstrip antennas are realized by cutting the slots of either quarter wave or half wave in length, inside the patch. In this design, however these simpler approximations of slot length ... -
Performance of Double-Pole Four-Throw Double-Gate RF CMOS Switch in 45-nm Technology
(Scientific Research Publishing, 2010-10)In this paper, we have investigated the design parameters of RF CMOS switch, which will be used for the wireless tele-communication systems. A double-pole four-throw double-gate radio-frequency complementary-metal-oxide-semicon- ... -
Design of Aperture Coupled Microstrip Antenna Using Radial Basis Function Networks
(Scientific Research Publishing, 2010-10)This paper, two Artificial Neural Network (ANN) models using radial basis function (RBF) nets are developed for the design of Aperture Coupled Microstrip Antennas (ACMSA) for different number of design parameters. The ... -
On the Design of Circular Fractal Antenna with U-Shape Slot in CPW-Feed
(Scientific Research Publishing, 2010-10)new ultawideband circular fractal antenna with notched-band characteristics is presented. A notched-band characteristic is achieved by employing a U-shape slot in 50 Ω feed lines. The ultra-wideband impedance matching and ... -
Rain Attenuation at Terahertz
(Scientific Research Publishing, 2010-10)Rain attenuation values were calculated using empirical raindrop-size distributions, which were, Marshall-Palmer (M-P), Best, Polyakova-Shifrin (P-S) and Weibull raindrop-size distributions, and also calculated using a ... -
Interference Mitigation in Satellite Personal Communication Networks Using Adaptive Antenna Arrays and Filtering Technique
(Scientific Research Publishing, 2010-10)We address the problem of interference as related to Satellite Personal Communication Networks (S-PCNs). Basic low Earth orbit (LEO) constellation is considered. The paper uses combined adaptive antenna arrays and adaptive ... -
Sampling and Reconstruction of Zero-Order Hold Signals by Parallel RC Filters
(Scientific Research Publishing, 2011)In this work we describe a reconstruction algorithm for zero-order hold (ZOH) waveforms measured by a parallel sam-pling scheme. In the method the ZOH signal is fed to a parallel network consisting of resistor-capacitor ... -
Bandwidth Enhancement and Size Reduction of Microstrip Patch Antenna by Magnetoinductive Waveguide Loading
(Scientific Research Publishing, 2011-01)A planar magnetoinductive (MI) waveguide loaded rectangular microstrip patch antenna is presented and discussed. The MI waveguide consists of two planar metamaterial split squared ring resonators (SSRRs) placed in between ... -
Experimental Analysis of a Node B Coverage Based on the CPICH and Ec/Io Values
(Scientific Research Publishing, 2011-01)This paper presents experimental results of a coverage analysis in a WCDMA network using the 850 MHz band; an urban electromagnetic propagation environment is considered. Obtained coverage estimation maps are based on Krige ... -
Experimental Analysis of Voice and Data Transmission Parameters for Mobile Terminals in Cellular Data Networks
(Scientific Research Publishing, 2011-01)This work presents the experimental results related to performance measurements in GSM and GPRS cellular data networks. Two Mobile Terminals were used, in order to take place the scenario. Power Level, Power vs Time, ... -
An Efficient Method to Reduce the Numerical Dispersion in the HIE-FDTD Scheme
(Scientific Research Publishing, 2011-01)A parameter optimized approach for reducing the numerical dispersion of the 3-D hybrid implicit-explicit finite-difference time-domain (HIE-FDTD) is presented in this letter. By adding a parameter into the HIE-FDTD formulas, ... -
Capacitive Model and S-Parameters of Double-Pole Four-Throw Double-Gate RF CMOS Switch
(Scientific Research Publishing, 2011-01)In this paper, we have analyzed the Double-Pole Four-Throw Double-Gate Radio-Frequency Complementary Metal-Oxide-Semiconductor (DP4T DG RF CMOS) switch using S-parameters for 1 GHz to 60 GHz of frequency range. DP4T DG RF ... -
Optimization of Impedance Plane Reducing Coupling between Antennas
(Scientific Research Publishing, 2011-01)This paper provides a solution for the design optimization of two-dimensional impedance structures for a given elec-tromagnetic field distribution. These structures must provide electromagnetic compatibility between antennas ... -
Perinatal Outcome of Inadvertent Immunization with the Measles-Rubella Vaccine in Pregnant Mexican Women during the Campaign for the Eradication of Congenital Rubella in 2008
(Scientific Research, 2011-02)Objective: To investigate maternal and neonatal complications resulting from inadvertent immunization against rubella-measles during the first trimester of pregnancy. Methods: A prospective and descriptive study was carried ... -
Inhomogeneous Perforated Reflect-Array Antennas
(Scientific Research Publishing, 2011-03)A new reflect-array antenna structure is proposed. This structure utilizes a perforated substrate as a reflecting surface with the lattice of different holes. The effective electric permittivity of the dielectric substrate ... -
Performance Tradeoff with Routing Protocols for Radio Models in Wireless Sensor Networks
(Scientific Research Publishing, 2011-04)In this paper, we have simulated and evaluated the performance tradeoff with routing protocols: Constrained Flooding, the Real-Time Search and the Adaptive Tree on MICA and MICAz platform with different radio models using ... -
A New Algorithm of Mobile Node Localization Based on RSSI
(Scientific Research Publishing, 2011-04)Position mobile node coordinate is a key component to determine the accuracy and efficiency of positioning in wireless sensor networks. Flexible location algorithm admits to adjust the accuracy and time cost of positioning ... -
MoM Analysis and Design of a Compact Coaxial-to-Microstrip Directional Coupler
(Scientific Research Publishing, 2011-04)In order to overcome the main drawbacks of coaxial, waveguide, and stripline couplers, the analysis and the design of a compact coaxial-to-microstrip directional coupler convenient for power and antenna control application, ... -
A Self-Similar Fractal Cantor Antenna for MICS Band Wireless Applications
(Scientific Research Publishing, 2011-04)Low profile antenna in communication is a new methodology. Fractal geometry is a methodology through which size reduction is achieved. A Self-similar fractal antenna using multicantor technique is proposed and experimentally ...