Time filter

Source Type

New Delhi, India

Singh A.K.,Mahatma Jyotiba Phule Rohilkhand University | Singh A.K.,Indian School of Mines | Gangwar R.K.,Indian School of Mines | Kanaujia B.K.,AIACTR
International Journal of Microwave and Wireless Technologies

A wideband orthogonally slot cut annular ring microstrip antenna fed by L-shaped probe is investigated using modal expansion cavity model and circuit theory approach. Simulation of the proposed antenna is performed using Ansoft HFSS and simulated results are compared with the measured and theoretical results. The impedance bandwidth of about 37.46% is observed at resonant frequency 3.15 GHz. The proposed antenna realizes an improvement in bandwidth of 13.46% and miniaturization in physical dimension about 10% from earlier reported structures. An improvement in bandwidth and miniaturization is due to thick substrate, L-probe feed, and orthogonally loaded slots. The measured results of fabricated antennas are in good agreement with simulated and theoretical results. Copyright © Cambridge University Press and the European Microwave Association 2015 Source

Gupta D.,LIBSYS Ltd | Gupta M.,AIACTR
International Conference on Recent Advances and Innovations in Engineering, ICRAIE 2014

Swarm based algorithms with features like easy implementation; self-organization and decentralization have led to emergent behavior successful in bridging the gap from idealistic situation to reality. Firefly Algorithm is one such new nature-inspired metaheuristic algorithms used for solving various optimization problems. It mimics the flashing behaviour of fireflies at night and was first proposed in 2008. In this work, performance of a new modified version of Firefly algorithm (MoFA) is compared with standard FA and two more versions of FA on various parameters. Results demonstrate that the new modified algorithm is superior to all the other three algorithms in all aspects. © 2014 IEEE. Source

Yaduvanshi R.S.,AIACTR
International Journal of Ultra Wideband Communications and Systems

A hybrid magneto-hydrodynamic antenna consisting of one copper annular ring loaded with dielectric resonator has been biased with DC voltage and magnetic fields. RF input and DC bias voltage has been applied in x direction and magnetic field B has been given in y direction. Propylene polymer pipes (PPR) cylindrical tube filled with mixture of barium strontium titanate (BSTO) and silicone oil is placed on the concentric copper annular ring. Mathematical coupled solution of Maxwell's and Navier Stroke's equations have been worked for this geometry. A new antenna parameter, i.e., velocity field (v) has been found to be contributing to the Poynting vector solution to this class of antennas. Velocity field (v) has become integral part along with E and H fields for computing Poynting vector. Hence, PPR geometry, fluid volume, copper annular ring radius, fluid permittivity, electric filed (E), magnetic field (H) and velocity (v) becomes the function of antenna resonant frequency and radiation patterns. A prototype antenna has been designed. Simulations based on HFSS have been presented. Both type results were compared. More than 4.5 GHz ultra large bandwidth and 17 dB gain has been reported in the results. © 2012 Inderscience Enterprises Ltd. Source

Singh A.K.,Mahatma Jyotiba Phule Rohilkhand University | Singh A.K.,Indian School of Mines | Gangwar R.K.,Indian School of Mines | Kanaujia B.K.,AIACTR
Microwave and Optical Technology Letters

A novel and simple design of circularly polarized sectored annular ring microstrip antenna with coplanar and concentric circular microstrip antenna is presented. The proposed antenna has single microstrip line feed with defected ground structure. Simulation analysis has been carried out using Ansoft High Frequency Structure Simulator (HFSS™) software and measurement is carried out using the Agilent™ Vector Network Analyser (N5230A:PNA-L). Parametric analysis of return loss and axial ratio versus frequency for different physical parameter of antenna has been studied. Experimental results of the proposed antenna show the 34.61% impedance bandwidth and 8.08% axial ratio bandwidth at 2.6 GHz center frequency with 6.96 dB peak gain. Simulated results are in good agreement with measured results. Due to low profile and simple geometry, it can be applicable for S-band application effectively as wireless LAN, Wi-Fi, Bluetooth, Zig-Bee, and radio frequency identification antennas. © 2016 Wiley Periodicals, Inc. Source

Singh D.K.,Indian School of Mines | Kanaujia B.K.,AIACTR | Dwari S.,Indian School of Mines | Pandey G.P.,Maharaja Agrasen Institute of Technology | Kumar S.,Indian School of Mines
International Journal of Microwave and Wireless Technologies

The design and measurement of reconfigurable circularly polarized capacitive fed microstrip antenna are presented. Small isosceles right angle triangular sections are removed from diagonally opposite corners for the generation of circular polarization (CP) of axial ratio bandwidth of 11.1%. Horizontal slits of different lengths are inserted at the edges of the truncated patch to provide the dual-band CP and by switching PIN diodes across the slits ON and OFF, reconfigurable circularly polarized antenna is realized. The antenna shows dual-band behavior with reconfigurable CP. In order to enhance the operation bandwidth of the antenna, an inclined slot was embedded on the patch along with PIN diodes across the horizontal slits. This proposed antenna gave an impedance bandwidth of 66.61% (ON state) ranging from 4.42 to 8.80 GHz and 68.42% (OFF state) ranging from 4.12 to 8.91 GHz and exhibits dual-frequency CP with PIN diode in OFF state and single-frequency CP with PIN diode in ON state with good axial ratio bandwidth. The axial ratio bandwidth of 4.42, 2.35, and 2.72% is obtained from the antenna. The antenna has a similar radiation pattern in all the three different CP bands and almost constant gain within the bands of CP operation. Copyright © Cambridge University Press and the European Microwave Association 2016 Source

Discover hidden collaborations