GENERAL PURPOSE MICROWAVE CIRCUIT ANALYSIS USING MATLAB

The application of Computer Aided Design (CAD) is very crucial to microwave
circuit design and analysis. The initial design of any arbitrarily microwave circuit
must be simulated and verified prior to its fabrication. This eliminates the timeconsuming
and costly changes on the fabricated circuit due to its limited ability to
incorporate any modifications. There are many commercially available CAD
packages that are used in industries and universities for fabrication and academic
purposes. These packages are very sophisticated and reliable. However, a licensed
microwave CAD package is very expensive for universities and colleges to obtain
and use, especially for academic purposes. In this fmal year project, an attempt to
develop a computer code that acts as a basis for an alternative CAD program for
microwave network design and analysis is incorporated. The CAD program is to be
developed specially to suit the learning requirements and outcomes of Microwave
Engineering courses at universities and colleges. This report gives a general review
on microwave circuits and their representations. In addition, it demonstrates the
method chosen to perform the analysis on an arbitrary connected microwave network;
Scattering Connection Matrix method. The report also details the procedure followed
to develop the required computer code based on the chosen method. The computer
codes are developed using Mathematics Laboratory (Matlab) software package. A
detailed discussion and verification of the results obtained is also shown in this
report. The results are verified using a sophisticated microwave CAD package called
Advanced Design System (ADS) and compared with the results obtained from
implementing the developed computer codes. Comparison of both results shows an
acceptable accuracy between them and thus proves that the chosen method to analyze
microwave networks is very effective and reliable.