Design of a Tri-band Antenna Using Artificial Magnetic Conductor Ground Characterized With Three Zero-Phases of Reflection Coefficient

In this communication, a triband AMC-backed microstrip antenna is designed. It is implemented by placing a triband microwave antenna which uses coplanar-waveguide (CPW) over a novel artificial magnetic conductor (AMC) with three zero-phases in the reflection coefficient. The AMC unit cell is composed of three homocentric copper rings. The simulated S-parameters generally corresponds to the performance of original antenna without AMC. The return loss of the frequency range 2.4GHz which can be used for WLAN is enhanced. By adjusting the distance between the antenna and the AMC plane, the performance near 1.8GHz can be optimized.