High-directive multiband microstrip patch antenna for biomedical applications, inspired by metamaterial

Abstract

Recent advancements in medical technology impose a limited number of devices for biomedical applications. A variety of techniques are being proposed to improve the performance of novel antenna designs in response to the rapid development of modern wireless technologies. A miniaturised microstrip antenna structure based on metamaterial (MTM) is presented here. The objective of this work is to present a high-directive antenna for wireless systems utilising MTM properties. Directivity is improved by the incorporation of the MTM structure on the ground structure. In order to improve the performance parameters of the antenna for medical applications, this study provides the design and analysis of a multiband patch antenna employing split-ring MTM. The split-ring resonator (SRR) MTM structures are embedded in a unique and novel way in the ground structure of the antenna. So that subwavelength modes get introduced in the patch cavity and a good performance characteristics is obtained. The reference antenna is a rectangular microstrip patch antenna exhibiting a directivity of 1.1823[Formula: see text]dB that resonates at a frequency of 2.32[Formula: see text]GHz. The optimised SRR MTM is positioned in the ground plane of the suggested antenna to increase the directivity of the antenna. This technology covers the frequency range between 2.24 and 3.96[Formula: see text]GHz used for biomedical applications and the ultra-wideband (UWB) range from 4.48 to 9.08[Formula: see text]GHz used for medical applications, industrial and scientific areas. The number of gaps of the rectangular-shaped SRRs is a key component of the enhancement of directivity from 1.1823 to 8.88823[Formula: see text]dB.