Design of microwave imaging based microstrip ultra-wideband antenna

The designed micro-strip ultra-wideband (UWB) antenna is based on a travelling wave propagating along the tapered surface with a phase velocity less than the speed of light. It results in end-fire radiation with a good penetration and resolution characteristics. The designed antenna for microwave imaging (MI) works on a technique which requires the measurement of reflected electromagnetic waves by the object under test. The UWB antenna with overall size of 70×40×1 mm using Rogers RO3003 substrate with a relative permittivity of 3 is designed using ANSYS-HFSS software. The results for the frequency band 3 to 20 GHz are optimized on the parameters return loss, VSWR and gain. The effect of different medium on the parameters of antenna is also tested. The designed UWB antenna has obtain return loss better than - 10dB and VSWR less than the 1.8 within the band (3GHz to 20GHz). The designed UWB microstrip antenna has wide practical application in concealed weapon detection, medical imaging, remote sensing, through the wall imaging etc.