An improvement of the miniaturized microstrip patch antenna based on coupled microstrips for on-body sensors

Abstract

This paper presents a low-cost miniaturized microstrip patch antenna (MPA) designed for on-body applications at a frequency of 2.45 GHz. The antenna is based on the coupled-microstrip principle using FR-4 material. The microstrip transmission line feeding method is used to easily integrate the antenna into the sensor chip on the same plane. The antenna has a gain of 2.28 dBi, a bandwidth of 2.62%, an efficiency of 46.5%, and overall dimensions of 48.6×48.6×1.6 mm³. To evaluate the performance of the proposed antenna, it is compared with three different antenna versions, considering the impact of the human body on the antenna and the specific absorption rate (SAR) of the human body. The proposed antenna shows excellent compliance with the requirements for on-body sensor antennas.