ABSTRACT

The classical printed monopole antenna exhibits wideband operation with low gain and an omnidirectional radiation pattern. In order to boost the gain of the antenna at two frequency bands, a novel dual-band zero-index metamaterial (ZIM) based on both electric and magnetic resonance is developed. The printed monopole is also backed by a metallic ground plane for unidirectional radiation pattern towards boreside. The presented unit cell is comprised of two Schurig split-ring resonators nested together in such an arrangement that it leads to a zero refractive index at two distinct frequencies. Using the proposed design methodology, a ZIM is designed operating at 2.4 and 3.5 GHz. To substantiate the improvement in gain, the proposed design is fabricated and used with a cavity-backed printed monopole antenna. The metamaterial superstrate increases the measured realized gain of the printed monopole antenna by 3.2 dB at 3.5 GHz and by 2.5 dB at 2.4 GHz, in agreement with simulations.

摘要

经典的印刷单极天线具有低增益和全向辐射模式的宽带操作。为了提高天线在两个频段的增益，开发了一种基于电和磁共振的新型双频段零折射率超材料（ZIM）。印刷的单极子也由金属接地平面支撑，用于朝向钻孔的单向辐射图。所提出的晶胞由两个嵌套在一起的 Schurig 开口环谐振器组成，它在两个不同的频率下导致零折射率。使用建议的设计方法，ZIM 被设计为在 2.4 和 3.5 GHz 下运行。为了证实增益的改进，所提出的设计被制造并与背腔印刷单极天线一起使用。