Resonant antenna based on CRLH TL

In this paper, a study of the compact microstrip antenna based on composite right/left handed (CRLH) metamaterial transmission line is presented. The physical size and operational frequencies of the antenna are determined by the CRLH metamaterial´s unit cell. The antenna exhibits monopolar radiation at its fundamental mode of resonant frequency. As it is well known that the composite right/left-handed (CRLH) transmission line (TL) has unique property of an infinite-wavelength wave at specific non-zero frequency because of zero permittivity and permeability. Generally, CRLH includes both LH series C/shunt L and parasitic RH series L/shunt C in its circuit model, resulting in a structure which is LH at lower frequencies and RH at higher frequencies. The operation bandwidth cover the required band widths of the IEEE 802.11 wireless local-area networks (WLAN) standards and worldwide interoperability for microwave access (WiMax) in the 2.97 GHz, 3.345GHz and 3.79 GHz (3.49-3.79 GHz). The zeroth order resonant frequency was found to be at 3.79GHz.