Switching Circuit Design For Linear Bi-Statics Ultra Wideband (UWB) Antenna In Microwave Bone Imaging Application

Ooi, Jian Ping (2017) Switching Circuit Design For Linear Bi-Statics Ultra Wideband (UWB) Antenna In Microwave Bone Imaging Application. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

Text Switching Circuit Design For Linear Bi-Statics Ultra Wideband (UWB) Antenna In Microwave Bone Imaging Application - Ooi Jian Ping - 24 Pages.pdf - Submitted Version Download (597kB)

Abstract

This project is part of the microwave imaging system collaboration project. The microwave imaging system will utilize the Ultra Wideband (UWB) frequency band and aim to become a new alternative bone imaging system. This project only focus on one of the components in microwave imaging system, which is the switching circuit. A new switching circuit design is required because the switches available in the market are not suitable to be used in the microwave imaging system. The current switches have limitation of insufficient isolation, narrow operation bandwidth, or high cost. So, the objective of this project is to design a PIN diode Single Pole Four Throw (SP4T) switching circuit that have low insertion loss, high isolation over UWB frequency band. The project is carried out by first selecting suitable components, then determine switch topology with good performance and finally designing the SP4T switch through several design process. All the design is constructed and simulated in Advanced Design System (ADS) simulation software. The simulation results in each stage of the projects are documented in this thesis. From the final design, insertion loss lower than 5.53 dB and isolation higher than 13.748 dB is achieved. The insertion loss is within the desired design parameter but future improvement is needed to further increase the isolation of the switch.

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