Waveguide Diplexer Design using MATLAB GUI for Microwave Engineering Education

This research presents a waveguide diplexer design using the simulator based on the K-inverter technique, which was developed using the GUI function of MATLAB® for microwave engineering education. The bandpass filter was synthesised using the Chebyshev approximation theory to design the structure of the inductive iris and the length between each iris in the waveguide. The diplexer designed using the developed GUI program was implemented in the operating frequency range of 8.35 - 8.65 GHz and 8.85 - 9.15 GHz, optimized performance with the commercial simulator. The simulated results of the designed waveguide diplexer BPF filter using the developed simulator can be designed consistently with the designed BPF theory. The designed waveguide diplexer band-pass filter using the developed GUI program can be implemented and used effectively as a teaching media for learning and teaching in engineering education.