Abstract
This paper present circular polarized micro strip antenna using Reactive Impedance Surface (RIS) below feed patch and metallic patches on substrate layer. The reactive impedance surface (RIS) does not only miniaturize but extensively enhances the bandwidth as well as the radiation characteristics of an antenna. The proposed antenna structure consists of a micro strip antenna fabricated on one side of FR4 substrate and RIS on other side of FR4 substrate. Diminution in antenna size and enhancement in gain of circular polarized antenna by using RIS and 5×5 array of patches fabricated on low cost FR4 substrate is proposed. Gain is enhanced from 8 dB to 14.6 dB when 5×5 array of parasitic patches is fabricated on a FR4 substrate layer. Meta-material are intermittent structures. These have been investigated intensively due to the exacting characteristics of ultra-refraction occurrence and negative permittivity or permeability. The Ansoft HFSS is used for the simulation. A patch antenna is used as the radiation source. The antenna size is reduced by 10.04% and bandwidth increased by 77.11% (1.097GHz).
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