Jibendu Sekhar Roy

Learn More
This paper presents a comparative study of beam forming techniques using least mean square (LMS) algorithm and its variants, like, normalized least mean square (NLMS) algorithm and sign least mean square (SLMS) algorithm. The accuracy of beam generation toward the direction of arrival (DoA) and null generation toward the interferer, depends on the value of(More)
Today Communication devices support several applications which require higher bandwidth; such as mobile phones these days are getting thinner and smarter but many application supported by them require higher bandwidth, so microstrip antenna used for performing this operation should provide wider bandwidth as well as their size should be compact so that it(More)
The investigations on a new proximity coupled dualfrequency microstrip antenna, which can be operated at GPS and Bluetooth frequency bands of wireless communication, are reported. The patch geometry consists of two square sections joined at the common corners and proximity coupled by a microstrip line. The results show that the antenna has sufficient(More)
The application of Genetic Algorithm (GA) to the optimization of gain of microstrip antenna, fabricated on ferrite substrate, biased externally by a steady magnetic field, is reported. The fitness function for the GA program is developed using cavity method for the analysis of microstrip antenna. The computed results are compared with the results obtained(More)
Design of thinned elliptical antenna arrays of uniformly excited isotropic antennas using particle swarm optimization (PSO), is reported. Thinned arrays can generate directive beam with minimum side lobe level (SLL) without degrading the performance of fully populated antenna arrays significantly. Thinning of elliptical antenna arrays using PSO are(More)
Differential evolution (DE) algorithm is used to design a microstrip antenna, loaded with a shorting pin. The position of probe and the position of shorting pin are optimized using DE. The fitness function for DE is obtained using multiport network modelling technique. Antenna is fabricated and measured results are compared with the theoretical results.
Differential evolution (DE) algorithm is applied to the design of single-layer and multi-layer microstrip antennas. For the design of single-layer co-axial probe-fed microstrip antenna, fitness function is obtained from cavity model theory of microstrip antenna, whereas for the design of multi-layer aperture-coupled microstrip antenna, transmission line(More)
Particle Swarm Optimization (PSO) is applied to the thinning of elliptical antenna arrays of uniformly excited isotropic antennas which can generate directive beam with minimum relative side lobe level (SLL). Thinning of elliptical antenna arrays using PSO are optimized with different values of eccentricity in all the cases and variation of side lobe level(More)
For efficient spectrum utilization in cognitive radio networks it requires appropriate allocation of idle frequency spectrum among coexisting cognitive radios while maximizing total bandwidth utilization and minimizing interference. The fixed spectrum allocation scheme leads to low spectrum utilization across the whole spectrum. This paper is an attempt to(More)
The design of a miniaturized proximity-coupled microstrip antenna (PCMA) is presented here. The antenna has very small size, wide bandwidth and moderate gain and may be used as small, compact antenna for 5GHz band wireless local area network (WLAN). Simulated results using IE3D software are verified by measurement.