Design and Analysis Of Micro strip Antennas For Ultra- Wide Band Applications

Abstract

A Micro strip fed antenna which consists of a rectangular patch with rectangular shaped slot incorporated into patch is presented for ultra-wide band application with enhanced bandwidth. The proposed antenna achieves an impedance bandwidth of 3.8-11.1GHz with for over the entire UWB bandwidth. Good return loss and radiation pattern characteristics are obtained in the frequency band of interest. The proposed antenna is designed on low cost FR-4 substrate fed by a 50-O micro strip line. The simulation was performed in CST 2012 software. The antenna parameters such as resonant frequency, return loss, radiation pattern and VSWR are simulated and discussed in this paper. The several factors affecting the bandwidth of the micro strip antenna such as the thickness of the substrate, the dielectric constant of the substrate and the shape of the patch also studied in this paper. The parametric study also contains the study of different techniques for optimizing the different parameters of antenna to get the optimum results and performance. This is a simulation based study. The first design is the two slotted rectangular micro-strip patch antenna and using DGS (Narrow Band). The second design based on RMSPA with single slot with partial ground plane and third and fourth design is based on circular and elliptical patch in which various antenna parameters like return loss, VSWR, directivity, and gain are studied for antenna designing. Now a days it is essential for an antenna designed for a system to avoid the interference from the other existing wireless system. The antenna should possess a band reject characteristic at interfering frequency bands. This can be achieved with the help of Band Notched Characteristics.