Metamaterials are artificially engineered material having negative permittivity and permeability. Due to their negative constitutive parameters, metamaterials are capable of focusing incident electromagnetic energy called as beam focusing property. We have made use of beam focusing property of metamaterial to enhance antenna far-field gain. We have also conducted experimental study by varying the distance between patch antenna and metamaterial array to determine optimum distance. The distance is varied in seven steps of 35 mm. The far-field gain of antenna is increased by 4 dB when metamaterial is placed at 95 mm. The beamwidth of antenna reduces when loaded with metamaterial indicating beam sharpening. At 155 mm from patch antenna, the beamwidth reduces to 33.95 degrees and starts increasing as metamaterial is moved further away. The resonance frequency and bandwidth of antenna follows alternate increase and decrease pattern as the distance of metamaterial is increased, however, the impact is negligible. (c) 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:178-183, 2015
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机译：超材料是具有负介电常数和磁导率的人工工程材料。由于它们的负本构参数，超材料能够聚焦入射的电磁能，称为束聚焦特性。我们利用超材料的波束聚焦特性来增强天线的远场增益。我们还通过改变贴片天线和超材料阵列之间的距离来确定最佳距离，进行了实验研究。距离以35毫米的七个步长变化。当超材料放置在95 mm处时，天线的远场增益增加4 dB。当装载超材料时，天线的波束宽度减小，表明波束变尖锐。在距贴片天线155毫米处，波束宽度减小到33.95度，并随着超材料的移动而开始增加。随着超材料的距离增加，天线的谐振频率和带宽遵循交替的增加和减少模式，但是影响可以忽略不计。 （c）2015年，Wiley Periodicals，Inc.微波Opt Technol Lett 57：178-183，2015年
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