Koch Snowflake Fractal Patch Antenna with New ENG Metamaterial loads for WiMAX and Wi-Fi

In this paper, a compact fractal antenna using metamaterial concept with the dual band characteristic is presented and investigated. The proposed antenna is developed by loading a new Complementary Split Ring Resonator (CSSR) cell into the square radiating patch center and then the Koch snowflake fractal, is introduced along the square patch edges. The reflection/transmission method has considered extracting the intrinsic properties of CSSR cell as metamaterial. The antenna has two resonance frequencies that matched with the Electric Negative metamaterial (ENG) characteristic, at 2.64 GHz and 5.6 GHz. Aforementioned antenna is designed on a Rogers 5880RT substrate, using CST microwave studio. The obtained results show that the antenna covers the main wireless, IEEE 802.16 WIMAX and IEEE (802.11n, 802.11ac ) 5 GHz ISM bands with sufficient gain and high efficiency (more than 90% typically). The metamaterial is used for controlling the resonances and Koch snowflake for improving.