Application of Deep-Sub-Wavelength Metamaterial Magnetic Conductor Surface to Unidirectional Small Antennas

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  • 極サブ波長メタマテリアル磁気導体面の単一指向性小形アンテナへの応用

Abstract

We have applied a deep-sub-wavelength artificial magnetic conductor (AMC) surface to a unidirectional small antenna at 920 MHz band. By constructing the AMC as a two-dimensional lumped element LC network, miniaturization of 1/6 to 1/13 of wavelength has been achieved. It is shown that such an AMC of only a fraction of area works as a significantly strong reflector of electromagnetic wave. A basic prototype antenna with a side 1/6 and a height 1/25 of wavelength, as well as an ultra-compact antenna of half the size of the basic one, have significantly large front-to-back radiation ratio and good unidirectionality, indicating the effectiveness of the AMC.

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