Metamaterial Multiband Antenna for Wireless Application

In this work a Multi-band antenna along with the innovative metamaterial structure is proposed which consists of a circular geometry incorporated with c shaped structure. This work is mainly focused on increasing the potential parameters of planar antennas and analyzing the multi band operation of proposed antenna. The impedance bandwidth of proposed antenna are covered and utilized frequency range of (2.6~3.1 GHz), (3.5~4.4 GHz) and (4.7~6.2 GHz). For verifying that the proposed metamaterial structure possesses Negative values of Permeability and Permittivity within the operating frequency ranges, Nicolson-Ross-Weir method (NRW) has been employed. For simulation purpose HFSS Software has been used. INTRODUCTION In the recent years the development in communication systems requires the development of low cost, minimal weight, low profile antennas that are capable of maintaining high performance over a wide spectrum of frequencies. The future development of the personal communication devices will aim to provide image, speech and data communications at any time, and anywhere around the world. This indicates that the future communication terminal antennas must meet the requirements of multi-band or wideband operations to sufficiently cover the possible operating bands. The performance of the fabricated antenna was measured and com-pared with simulation results [1]. Moreover, we have also indicated the appropriate choice of particular metamaterial for different specific purposes like antenna size reduction and other mode modificationrelated applications [2]. The performance of a rectangular patch antenna array on a metamaterial substrate was studied relative to a similar array constructed on a conventional FR4 substrate [3]. In modern wireless communication systems, the microstrip patch antennas are commonly used in the wireless devices. There-fore, the miniaturization of the antenna has become an important issue in reducing the volume of entire communication system [4]. In modern wireless communication systems, the microstrip patch antennas are commonly used in the wireless devices. The demand in commercial and military wireless systems is due to capabilities of proposed Antenna such as low weight, low profile, low cost, easily combined with design and technology, and relatively simple fabrication. All these antennas can also fabricate using HFSS simulation software and get very sharp characteristics. Proposed Antenna can be largely used in many wireless communication systems because of their low profile and light METAMATERIAL MULTIBAND ANTENNA FOR WIRELESS APPLICATION Nader AZIZI, Javad NOURINIA 734 weight Microstrip antennas are largely used in many wireless communication systems because of their low profile and light weight [5]. The theoretical concept of metamaterials to increase the transmitting power was given by Victor Veselago (1968), Engheta and Ziolkowski (2006), Pendry (2000) Garg et al. An array of metallic wires can be used to obtain negative permittivity and split ring resonators for negative permeability (Pendry et al., (1999). By using the available information a structure composed of split ring resonator and thin wire fabricated by Smith et al. (2001) possessed the negative permittivity and permeability simultaneously. This structure was named as LHM (Wu et al., 2005) (Burokur et al., 2005). Metamaterial is an artificial material that exhibits unique properties in electromagnetic spectrum unlike those of conventional materials available in nature [6]-[7]. The conventional material available in nature have positive magnetic permeability and almost positive dielectric permittivity, whereas metamaterial exhibits negative permeability, μ and/or negative permittivity, ε. Due to these significant features metamaterial is also referred to as single negative(SNG) or double negative(DNG) material [6]-[8]. In metamaterial, the refractive index is negative i.e. the group and phase velocity of the electromagnetic wave appears in opposite direction. The reversed direction of propagation with respect to direction of energy flow leads to reversed Doppler shift. These materials are also referred to as negative index material (NIM) because the refractive index is negative hence both refracted and incident wave remains on same side [6-12]. The potential applications of metamaterials at microwave frequencies include (a) substrate materials for antenna and microwave component designs and fabrications, and (b) absorbers for engineering and radar applications. Split ring resonators (SRRs) [12] and some other planar structures [12-18] were applied to enhance the return loss. In this paper a novel shape of SRR metamaterial structure is used to antenna patch that provide an antenna with multiband application.