CPW fed elliptical zeroth order resonant antenna for WiMax applications

In this paper, a new compact coplanar waveguide (CPW) fed elliptical zeroth order resonant (ZOR) antenna based on Composite Right/Left Handed (CRLH) transmission line is proposed. The performance of the antenna is designed and simulated by Ansoft HFSS. The reflection coefficient, gain and antenna efficiency of the proposed antenna are observed to be - 38.3108dB, 2.1930dB and 77.286% respectively at the zeroth mode of 4.89GHz. In this paper an effort is made to circumvent the narrow bandwidth problem and fabrication complexity as exhibited by popular microstrip based ZOR antennas with vias. It is observed that an extended bandwidth of about 6.6% at the zeroth mode is obtained. Since the proposed antenna is implemented by using a combination of open ended spiral and anti-spiral inductors using CPW feeding technique, so vias are not required which enables the fabrication of this antenna simple and easy. The proposed antenna also has an additional advantage of being a very low profile one exhibiting an omni-directional radiation pattern typical of monopole antennas. Hence the antenna is suitable for modern wired and wireless systems and also suitable for Worldwide interoperability for Microwave Access (WiMax) applications (IEEE 802.11a standard).