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–The design of a broadband printed slot antenna is reported here. First, the CPW-fed conventional rectangular slot antenna is designed and then the rectangular shape is modified by a stepped configuration to achieve higher bandwidth. The simulated results using IE3D software are verified by measurement and the results show that the printed stepped-slot(More)
Pilot Added Channel Estimation (PACE) for Orthogonal Frequency Division Multiplexing (OFDM) in multiple transmitting antennas causes inter-antenna interference. This can be mitigated by the use of null sub-carriers. However the presence of null sub-carriers degrades the spectral efficiency of OFDM system This paper proposes an efficiency enhancing channel(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)
– The investigations on a new proximity coupled dual-frequency 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)
– 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.
— 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(More)
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)