Dear Mr Hayder S. Ahmed, i am also working on filter design and want to get its equivaent ckt in HFSS. kindly share the process/steps as you have done some work on it and perhaps got it published.
In electric circuits a filter is often a capacitor and an inductor in parallel tuned to resonate at the target frequency or some harmonic of it. A number of configurations are possible depending on what is to be done with the other components of electricity, which might be either drained off or inverted and reflected backwards.