자성체를 이용한 안테나의 소형화에 관한 연구

Abstract

This thesis describes several methods for miniaturization and wide band effects of antenna. Two examples of the proposed methods are magneto-dielectric material and R and L chip components matching. First, in case of magneto-dielectric material, single and double layer substrates are considered. Single layer magneto-dielectric subatrate is material which has permittivity and permeability together. And double layer magneto-dielectric substrate is matrial which has permittivity and permeability each other. In order to confirm a miniaturization rate and wide band effect, sample antenna is redesigned because magnetic substrate operates well at 1 GHz frequency band. Especially, in case of structure using magnetic substrate and air gap, magnetic pole and cylinder are considered to confirm miniaturization ability. In case of magnetic pole, the parameter is number of pole. And in case of magnetic cylinder, in order to find optimistic value, the thickness and inside diameter of cylinder is studied. So alteration tendency of optimistic resonance frequency is confirmed in according to thickness and inside diameter of magnetic cylinder pole. At the last R and L chip components matching method is used for design of internal FM radio antenna. This has advantage for miniaturization but gain is not good.

The magneto-dielectric material and R and L chip components matching methods are proposed in this thesis. These are very helpful to miniaturize antenna size. Due to the these merits of proposed methods, it is expected magneto-dielectric material could be applied in the wireless communication system.