Specification Level Optimization Based CAD of Waveguide Bandpass Filters

Modern satellite and terrestrial telecommunication systems usually employ a large umber of waveguide filters operating at microwave frequencies. Traditionally, waveguide filters are designed empirically using approximate discontinuity models and extensive prototyping. Over the last two decades, the demand for accurate analysis and design techniques has generated a tremendous output of numerical methods for microwave applications. With the advent of powerful computers, field theory based models became desirable tools for computer aided design of waveguide filters. In this thesis, complete computer aided design methods for H-plane iris coupled waveguide and pass filters are developed. A new technique using closed form equations to model iris discontinuities is discussed, as well as a new optimization approach which uses three optimization variables regardless of the order of the filter. Several filters designed using he new optimization approach are presented in this thesis. With the computer aided design methods discussed in this thesis, H-plane iris coupled waveguide bandpass filters an be quickly and accurately designed without post production tuning