A Compact Dual-Band Folded-Cavity Antenna for Microwave Biomedical Imaging Applications

Abstract

A compact dual-band folded-cavity antenna is presented for microwave biomedical imaging applications. The antenna which operates at 433MHz and 915MHz in industrial, scientific and medical (ISM) band radiates in the in-body direction. The antenna has a compact size of 20mm × 20mm. It is miniaturized by folded-cavity structure. A circuit with lumped components is adopted to improve impedance matching performance. The antenna is fabricated and an experiment is conducted to verify its performance. The comparison between simulation and experiment results is made and discussed. This antenna may be used for thorax imaging in the future development.