Ultra-WideBand antenna array design and development for microwave imaging

Won, Poh Ting (2017) Ultra-WideBand antenna array design and development for microwave imaging. Project Report. UTeM, Melaka,Malaysia. (Submitted)

Text (24 Pages) Ultra-WideBand antenna array design and development for microwave imaging.pdf - Submitted Version Download (2MB)

Abstract

Microwave imaging has been one step forward among the biomedical imaging techniques such as X-ray,Magnetic Resource Imaging (MRI)and ultrasound imaging.By projecting non-invasive high frequency electromagnetic (EM) waves across the human body parts,the signals across the body tissues of different dielectric constants will reflect on di screpancy which then to be processed with algorithm in order to reconstruct the 3D image.Antenna plays an important role as the transmitting and receiving elements whereby the reflection coefficient of the antenna itself should be extreme low to ensure optimal operation of antenna.An Ultra-WideBand (UWB) antenna operating from 3.1 GHz to 10 GHz with the microstrip patch design is proposed at which its return loss is targeted to below -10 dB.Return loss of -10 dB indicates 90% of the signals are being transmitted successfully across the matching terminals to the antenna radiating element with only 10% of them being reflected back to the system.This project presented an optimized microstrip patch UWB antenna of dimension 20 mm X 18.5 mm with return loss of below -10 dB at bandwidth 3.1 GHz to 10 GHz.Substrate of Flame Retardant 4 (FR4) with dielectrics constant of 4.4 of thickness 1.6 mm is being used in conjunction with the application of partial ground plane and added circular slot on conducting patch.The antenna design is well simulated using CST Simulation Software for its return loss of -20 dB from 3.1 GHz to 10 GHz with 180° phase shift on Far-Field radiation pattern. Validation of the antenna is conducted with the fabricated prototype to perform measurement process with the aid of Vector Network Analyzer (VNA) in the far-field region.The measurement and simulation results are compared and analyzed for its performances.

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