Optimization of a 3D UHF cubic antenna with quasi-isotropic radiation pattern for RFID, WSN and RSN applications

摘要

In this article, the conceptions of miniaturization of a 3D cubic antenna are presented and discussed. The miniature 3D cubic antenna is designed to operate in the UHF band [902-928 MHz] (centered at 915MHz), produce a quasi-isotropic radiation pattern and have a miniaturized size which gives us a low cost, light weight and a compact size device for RFID, WSN and RSN applications. The size of this antenna was reduced from 30 × 30 × 30 mm~3 to 13.48 × 13.48 × 13.48 mm~3 that implies a reduction in volume of 90.9279% and a reduction in electrical size of 54.35%. A T-match configuration has been added in order to adapt the input impedance of the antenna to the 50 Ω value. The circuit and radiation parameters simulated by HFSS and CST of the miniaturized antenna show good agreement. The form of the antenna allows to easily envelope the circuits of sensors in its interior, to reconfigure it for many values of impedances, and to operate it in other ISM bands by adjusting their geometric parameters.