Compact and triple band meta-material antenna for all WiMAX applications

The electric permittivity (e) and magnetic permeability (μ) of a medium are the electromagnetic constitutive parameters of the medium which are used to describe the material behavior on applying an electromagnetic wave. In general, metamaterial artificial effective medium are electromagnetic ordered array scatters satisfying a sufficient long wavelength condition at RF/microwave frequencies to demonstrate particular electromagnetic properties. Since the emerging of metamaterials, electromagnetic community has been making great effort in utilizing their unique properties. Planar left handed (LH) transmission media have been realized using different techniques. They can be based on loading a hosting transmission line (TL) with series capacitors and shunt inductors [1,2]. This approach is a non resonant approach and has advantage of compactness in addition to the broad bandwidth. Due to the parasitic shunt capacitor and series inductor effects of the hosting transmission line, this TL can be named as composite right/left-handed (CRLH) TLs [1]. This approach has led to development of novel guided and radiated microwave devices and components. Many antenna performance and size enhancement have been introduced employing different metamaterial LH TL structures [3–6]. The CPW configuration is preferred rather than microstrip configuration in many applications. Such configuration makes the implementing of shunt inductive required for LH TL becomes more simple and hence inexpensive fabrication procedures in addition to their simple cascading with active components.