Sadasivarao, B.; Madhav, B. T. P.
June 2014
Journal of Agricultural & Biological Science;Jun2014, Vol. 9 Issue 6, p885
Academic Journal
Most of the microstrip patch antennas are constructed on thin substrates with low dielectric constant. The demand of millimeter wave and monolithic fabrication increased the interest of thick substrates with high dielectric constant. The efficiency of the antenna will decreases with increase in substrate permittivity but size of the antenna also decreases. When substrate permittivity is decreased, then performance can be improved. The thicker substrates will increase the bandwidth but if it exceeds some point then surface wave losses will be affected. Thinner substrates will not give bandwidth enhancement but surface wave losses can be decreased. There is tradeoff between substrate material selection and the performance of the antenna and the size. Without changing the substrate material, the size reduction can be achieved by employing slots in the model. The purpose of this paper is to provide a set of output parameters of hybrid slot antenna with change in substrate permittivity. The performance evaluation of hybrid slot antenna is carried out by changing the dielectric constant of the materials by maintaining the constant thickness of 1.6mm.


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