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A low profile, dual frequency probe-fed Microstrip antenna with E-shape radiating patch is designed and proposed for S-band and C-band applications. The purpose of this work is to obtain a dual frequency antenna with high gain and less return loss at the intended frequencies. The operating frequencies of the proposed antenna are 3.51 GHz and 5.82 GHz which are suitable for wider band of frequencies...
This paper deals with the electromagnetic (EM) wave propagation modeling in complex tunnel environments. We propose a novel segmented alternating direction implicit finite difference time domain (S-ADI-FDTD) method for modeling the electromagnetic wave propagation inside an electrically large tunnel. The proposed S-ADI-FDTD method reduces the computational redundancy by dividing the problem space...
In this paper, nonorthogonal locally one dimensional finite difference time domain (LOD-NFDTD) method based on curvilinear coordinate system is presented for analyzing electromagnetic scattering from curved conducting structures. A formulation of LOD-NFDTD method for two dimensional problems is provided. In our generalized approached, the non-orthogonal grid is used to model the computational domain...
This paper presents the design of a modified rectangular microstrip patch antenna for quad band applications specially for C-band, X-band, Ku-band and K-band applications. The antenna is simulated using the commercially available software General Electromagnetic Solver (GEMS) simulator and MATLAB. Quad band is achieved using six vertical slits in the rectangular patch and feeding with microstrip feed...
This paper presents a simple but novel circular ring slotting technique into rectangular microstrip antenna of making a compact patch which works in four frequency band. This compact microstrip antenna realized by changing the geometric shape, obtained by inserting small circular slots. The simulation has been performed by simulation software GEMS version 7.71.01 and using Taconic TLY-5 dielectric...
We present a photonic crystal fiber (PCF) for shaping nearly zero ultra-flattened dispersion and low splice loss at telecom window. The finite-element method with perfectly matched layers boundary condition is used to investigate the guiding properties. Simulation results reveal that, ultra-flattened dispersion of 0 ± 0.8 ps/nm/km is obtained in a wavelength range of 1.33 to 1.71 μm with low splice...
In this paper, we propose and demonstrate a simple photonic crystal fiber (PCF) based on decagonal cladding structure for simultaneous control of dispersion and leakage properties restoring the design simplicity. Simulation results show that decagonal photonic crystal fibers with five rings can assume ultra-flattened dispersion of 0 ± 0.6 ps/nm/km in the wavelength range of 1.30 to 1.60 μm with low...
The number of nodes in a deployed wireless sensor network might vary due to ad hoc nature, natural disaster. Counting the number is very important in useful data collection, network maintenance, node localisation. Although protocols are being used to count the number in terrestrial networks, harsh environment limits their use in underwater networks. A statistical signal processing approach of node...
This paper presents a simple, low cost compact microstrip antenna, which works in triple frequency band. This compact microstrip antenna realized by changing the geometric shape, obtained by inserting a vertical slot. The simulation has been performed by simulation software GEMS version 7.71.01 and using Taconic TLY-5 dielectric substrate with relative permittivity 2.2 and height 1.588mm. The simulated...
Due to random variations of wind speed, the output power and terminal voltage of a fixed-speed wind generator fluctuates continuously. In this paper, it is reported that the SMES system with a voltage-source IGBT converter and a DC chopper can smooth the line power and can also maintain the terminal voltage of fixed-speed wind generator at desired level, as it has both real and reactive power control...
The main motto of this paper is to design the effective shape of a microstrip patch antenna which can provide lower return losses, better gain and performance for K-band (18 GHz to 26 GHz), Ku-band (12 GHz to 18 GHz) and X-band (2 GHz to 12 GHz) applications. Attempts have been made to optimize the antenna performance by using a single slot in different position in patch, by increasing the number...
As wind turbine output is proportional to the cube of wind speed, the wind turbine generator output fluctuates due to wind speed variations. Hence, if the power capacity of wind power generators becomes large, wind power generator output can have an influence on the power system frequency. Some methods for smoothing the wind generator output fluctuations using several types of energy storage systems...
Due to random variations of wind speed, the output power and terminal voltage of a fixed speed wind generator fluctuates continuously. These irregularities in power output affect the power quality and thus an energy storage system is needed. In this work, the STATCOM/SMES system with a voltage-source IGBT converter is proposed as a controllable energy storage system. The proposed STATCOM/SMES system...
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