Development of microwave imaging system using multistatic configuration with phase shifter for spatial object detection

Mohd Khairi, Afzan Najiha (2021) Development of microwave imaging system using multistatic configuration with phase shifter for spatial object detection. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

There are many imaging techniques nowadays such as X-Ray, CT scan, MRI and Microwave Imaging System (MWI). The MWI system seem to be the most safest and inexpensive compare to others systems. However, there are three configurations in microwave imaging which are Monostatic, Bistatic and Multistatic. Multistatic configuration system is able to scan 3600 without mechanical and physical movement. However, the radiated signal in multistatic configuration can be cancelled or reduced due to the phase differential. Therefore, this project aims to be developed the MWI system using multistatic configuration with phase shifter for spatial detection. The MIMO (4x4) MWI system based on multistatic configuration system has been developed to detect the Defected Material (DM). The microwave sensors with 00, 450, and 900 phase have been designed and fabricated based on Vivaldi structure at frequency on 3.924GHz. All sensors meet the minimum reflection coefficient requirement of -10dB. Next, the 4x4 multistatic MWI system has also been setup for spatial detection testing. Meanwhile, water, soap, sand, soil, sugar, flour and plasticine were selected for material under test (MUT). The metal, lime, rubber and plastic were chosen as the defected material under test for spatial detection measurement. The measurement result shows that the average efficiency of the system is 26.95%. The system can detect plastic and rubber better in water and sand with efficiency of 50%. The highest efficiency of 62.5% achieved when system try to detect the plastic in soil. Therefore, the developed system can be used in detection of plastic material.

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