ABSTRACT

In this paper, the construction of a miniaturised hexagonal microstrip antenna (MSA) loaded with Defected Ground Structure (DGS) and Metamaterial (MTM) superstrate proposed for 5.2 GHz WLAN application is presented. Initially, the fundamental resonant frequency of the hexagonal MSA was reduced from 14.8 GHz to 5.2 GHz using a rectangle DGS. For the suggested antenna model a miniaturisation of about 64.86% is achieved, which makes the antenna to approach electrically small antenna. Finally, the characteristics of MSA loaded with DGS and an MTM superstrate, which enhances the peak gain, directivity, and efficiency. The suggested miniaturised antenna with substrate dimensions of 0.25λ₀ × 0.243λ₀ mm² (or) 14.4 × 14 mm² of thickness h₁ = 1.6 mm fabricated on an FR4 epoxy of dielectric constant 4.4. By employing an MTM superstrate, of RT Duriod substrate of thickness h₂ = 1.575 mm above the proposed miniaturised hexagonal MSA at a height of h₃ = 14.4 mm, a gain increased from 3.32 dBi to 6.38 dBi is attained at 5.2 GHz. The simulated outcomes of the suggested model are in association with experimental results of the prototype model.

摘要

在本文中，介绍了一种装载有缺陷接地结构 (DGS) 和超材料 (MTM) 覆层的小型化六边形微带天线 (MSA) 的构造，该天线适用于 5.2 GHz WLAN 应用。最初，使用矩形 DGS 将六边形 MSA 的基本谐振频率从 14.8 GHz 降低到 5.2 GHz。对于建议的天线模型，实现了约 64.86% 的小型化，这使得天线接近电小型天线。最后，加载 DGS 和 MTM 覆层的 MSA 特性可提高峰值增益、方向性和效率。建议使用基板尺寸为 0.25λ ₀  × 0.243λ ₀ mm ² (或) 14.4 × 14 mm ²厚度 h 的小型化天线₁  = 1.6 mm 在介电常数为 4.4 的 FR4 环氧树脂上制造。通过采用厚度为 h ₂  = 1.575 mm的 RT Duriod 基板的 MTM 覆板，在 h ₃  = 14.4 mm的高度处，在建议的小型化六边形 MSA 上方，增益从 3.32 dBi 增加到 6.38 dBi，在 5.2 GHz 下实现。建议模型的模拟结果与原型模型的实验结果相关。