The at the bends and surfacediscontinuity, at

The micro-strip patch antenna was introduced in the beginning of 1950 with limited applications.In last decades there has been a rapid growth in antenna design of integrating GPS into terrestrial wireless communication system. Global navigation Satellite System (GNSS) is the standard universal term for radio navigation satellite systems that provide autonomous geo-spatial positioning with global coverage. The GNSS permits receivers to determine their location using signals transmitted from satellites. Aviation receivers utilizes GPS L5 radio navigation.  Micro-strip antenna is most widely used antenna because of itslow cost, light weight, ease of fabrication, printed technology,conformable to planner and non planner surfaces. In addition, feed line andimpedance matching network can be integrated. But it also havesome drawbacks like low gain, narrow bandwidth and challenges in designing.To overcome with various drawback different designing aspects are used but the main problem is covering one drawback sometimes results into another drawback.By increasing the height of substrate, we can increase thebandwidth and radiation efficiency but at the same time thesurface waves comes in pictures which travel within thesubstrate and they scattered at the bends and surfacediscontinuity, at the truncation of dielectric and ground plane.This extracts the power from total available power, hencedecreases the efficiency. The surface waves can be eliminatedby using the cavity. By the Stacking method we can increasethe Bandwidth. The matching between the Patch antenna andfeed network is mainly depends on the feeding technique used for this. Various feeding techniques have been discussed in literature like micro-strip line Feed, proximity coupled feed, coaxial feed, inset feed, aperture couple feed.In this work we have designed rectangular micro strip antenna using High Frequency Structure Simulator software with frequency 1.176GHZ using coaxial feeding because  the feed can be placed at any desired location on thepatch in order to match cable impedance with the antenna input impedance as well as it enhances the gain and provides narrow bandwidth. We tried with different different design  configuration of antenna in HFSS and optimized the results according to our application. We have calculated various parameters like radiation pattern(3D), bandwidth, axial ratio, VSWR, reflection coefficient,gain plot etc. and the results are discussed in the section

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