Miniaturized zeroth order resonance antenna over a reactive impedance surface

A miniaturized zeroth order resonance (ZOR) antenna designed on a reactive impedance surface (RIS) is proposed and presented. It is essentially a composite right/left-handed (CRLH) structure which enables the miniaturization by pushing down the left-handed (LH) region. This is achieved by increasing the LH inductor using a shorted meander line. The RIS consists of two-dimensional periodic printed metallic patches. It is an inductive surface which can also miniaturize the antenna size and improve the radiation efficiency. The antenna radiates omni-directional waves in the horizontal plane. Simulated and measured results are provided, which show a good consistency.