The Design of High Gain Omni Directional Monopole Based on Conformal Metamaterial Cover

A high gain omnidirectional monopole antenna with a metamaterial cover is proposed in this paper. We show that under proper condition the energy radiated by a source embedded in a cylinder of metamaterial will be concentrated in a narrow cone in the horizontal plane and maintain its omni-directivity in the vertical plane. The ideas developed here are applied in the microwave domain to realize a high gain omnidirectional monopole antenna using conformal metamaterial which is composed of metallic cylinder array. The measured results show that the gain of the monopole is increased from 5.0 dB to 7.3 dB and maintains its omni-directivity. Our designs are helpful in the application of metamaterial in omnidirectional communication antenna.