Design of Compact Zeroth-Order Resonant Antenna Based on CRLH TL

Abstract

Metamaterial (MTM) Based Antennas are class of antennas inspired by metamaterials to enhance the capability of antenna.One of the new applications is the Zeroth-Order Resonant (ZOR) antenna, which is based on Composite Right Left Handed (CRLH) transmission lines(TLs) periodic structures. In addition, ZOR antenna is easy to fabricate and allows design freedoms. Small physical size, low cost, broad bandwidth & good efficiency are desirable features for an integrated antenna. This thesis presents the design and analysis of Asymmetric compact coplanar waveguide(ACPW)-fed zeroth-order resonant (ZOR) antenna. The antenna designed on a ACPW single layer where vias is used. The ZOR phenomenon is employed to reduce the antenna size. The Composite Right Left Handed (CRLH) unit cell on a single layer simplifies the fabrication process. In addition, the ACPW geometry provides high design freedom, so that bandwidth-extended ZOR antenna can be designed.As an advantage of the proposed method, the size of antenna is reduced, and the resonant frequency of zeroth-order mode is 4.57GHz with radiation efficiency of 75.36 %,simulated -10dB fractional bandwidth up to 9.24% and omni-directional peak gain of 1.93 dBi.