Research On Low Profile Antenna Based On AMC And The Optimal Structure

In recent years, metamaterials has received massive attention in the fields of applied electromagnetics, solid state physics and materials science because of their special electromagnetic properties and has become one of the current research hotspots. Artificial Magnetic Conductor is a typical kind of metamaterial. It has the nature of ideal magnetic surface in the reflection band gap, based on which there are numerous advantages and practical prospects in the aspects of low-profile antenna production and antenna radiation performance improvements. Therefore, the AMC structure research is of paramount significance.The directive gain of half-wave dipole antenna is low because of omnidirectional radiation, not suitable for practical application. In order to improve the shortcomings, we need to load catopter at one side to improve directive gain. In this study, thorough study and research have been carried out based on applying AMC structure to dipole antenna.Firstly, the generation mechanism AMC reflection band-gap is introduced, then the important parameters affecting the band gap are analyzed in details and relevant conclusions are reached.Secondly, AMC structure of specific reflex frequency is designed and applied to dipole antenna. Therein, to explore the optimal AMC structure that achieves the maximum antenna directive gain, the AMC structure patch elements of square arrangement, rectangular arrangement and the influence of earth plate on directive gain are discussed in this paper. Additionally, two new elements arrangement schemes are proposed. By comparing optimal AMC structure with the loading surface electric dipole antenna, it is indicated that the antenna of optimal AMC structure not only achieves the practical application need of low profile, but also improves the antenna directive gain by3.6dB.Finally, the optimal AMC structure is applied to the antenna array in this paper. Research is carried out in two major areas:(1) analyze the bandwidth and the directive gain of parallel and coaxial vibrator binary array loading AMC structure and optimal electrical surface; It is indicated in the results that the performance of the former structure is better that of the latter.(2) explore the arrangement that has the maximum antenna directive gain by changing the antenna unit arrangement in four-element array under the same AMC structure.