Improving frequency band of ultra wide band antenna with metamaterial

In this manuscript, a small design of microstrip Ultra Wide Band (UWB) antenna was proposed. The antenna can work in frequency band of (1.5 GHz to 18 GHz). The paper describes the design of compact UWB antenna with 3.5GHz single band-notched characteristic. To achieve the UWB work of the antenna a circular microstrip antenna was used with improving ground plane as a semicircular ground. This shape produces a bandwidth range between (3.15–18) GHz with by decreasing the ground plane of 25% from the existing ground plane. Then the research concentrates on proving the existence of the negative phase of transmission coefficient within certain frequency region. And, the relationship between different varies dimensions used affect the frequency response (reflection and transmission coefficient) is emphasized in order to understand further the metamaterial structure and its properties. Also, it looks into the effect of metamaterial structure to the ultrawideband antenna by using artificial magnetic structure such as Split Ring Resonator (SRR) that satisfies enhancement in bandwidth in the range (1.5–18) GHz. It is suggested that antenna can work in frequency band more of then (2–8) GHz to be used in (4G) mobile communication. Finite element method was used to analysis the work of the modeled antenna with metamaterial using the Ansoft HFSS.