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This paper is emphasized on the total sensing time of the dedicated sensing receiver (DSR) of the cognitive radio (CR) network. To minimize the total sensing tine that is the time taken by the receiver to sense the spectrum, a potential modification has been made in the basic cognitive radio receiver architecture. The cognitive radio is a novel communication network, which is useful in utilizing the...
In this paper, the effects of shorting pin on resonant frequency of the gap-coupled circular microstrip patch antennas is presented. The effects of location of shorting pin and variations of its diameter as well as the effect of variation of gap distance between adjacent edges of the feed patch and parasitic patch of gap-coupled circular microstrip patch antennas on the resonant frequency is simulated...
In this paper, we have simulated 2D photonic crystal (dielectric slab with regular cylindrical periodic lattice of air-gap) as substrate to enhance the electrical performance of the microstrip (rectangular or circular) patch antenna at THz/millimeter wave frequencies. The periodic structures designed to open up frequency bands within which the propagation of electromagnetic waves is forbidden irrespective...
In this paper, the concept to enhanced directivity of a electrically small subwavelength radiator containing plasmonic materials with negative permittivity at THz, infrared and optical frequencies have been explored theoretically. We study plasmonic resonances of a subwavelength core-shell spherical nanoantenna and simulate the far-field radiation patterns of such a structure when it is excited by...
The effect of multilayer, 2-D photonic band gap substrate on the performance of rectangular microstrip patch antenna at THz frequency is simulated. The radiation efficiency, gain and directivity for the proposed antennas are 93.28%, 10.46 dB and 10.76 dBi, respectively at 875 GHz. The 10 dB impedance bandwidth of the antenna is 36.67%, which is ultra-wide bandwidth. The simulation has been performed...
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