Simple tool to evaluate amplitude of spurious responses of filter assemblies caused by out-of-band mismatch.
Freeware design tool. Follow steps and design a harmonic (low-pass) corrugated filter online.
Freeware design tool. Simulates frequency response for planar (micro-strip, strip-line) structures online.
Freeware design tool. Simulates potential spurious spikes or pass-bands caused by high order waveguide modes.
Technical note explaining nature of spurious responses of waffle-iron filters.
Summary of "fast" semi-numerical and semi-analytical computational method perfect to simulate performance of "practical" filter structures based on metal posts, irises, ridges in different mediums.
Quite standard and old approach how to design an H-plane iris filter without software.
A generalized version of the previous approach applicable to any kind of direct-coupled filter. A simulator is required here. Following this approach you can build a filter from any kind of junctions like a house from bricks.
Similar procedure is applied to quarter-wave-coupled filters. It is a little more sophisticated, but it gives some advantages.
A simple multi-moded procedure to test harmonic filters.