Abstract: A source embedded in a vertically installed cylinder of the low-refractive medium ( n＜1) will be concentrated in a narrow cone in the vertical plane and maintain its omni directivity in the horizontal plane. The ideas developed here are applied to the monopole using the conformal metamaterial cover which is composed of metallic cylinder arrays, the transmission properties of this metamaterial is analyzed by the method of moments, and the monopole antenna system based on the metamaterial cover is measured. Results show that the pattern of the monopole becomes more convergent in the E plane and maintains its omni-directivity in the H plane and that the gain of the monopole is increased from 5.0dB to 7.8dB.

Key words: conformal metamaterial, omni-directivity, low-refractive