archimedes spiral programm
abhi_kolkata shalom,
(Proper Disclosure: I work for Ansoft rep in Israel)
A) In HFSS the spiral can be drawn in three ways:
1) Use the built in Spiral operation (that sweeps any crosssection along a spiral)
2) Use the built in Equation curve (that can be used to sweep the cross section)
3) Program your own spiral using C++ (Called User Defined Primitive).
B) HFSS allows you to study different groundings (or cavities) behind the antenna.
C) In addition the mesher (that cuts the geometry into polygons) can be instructed how accurate should it trace the spiral geometry. The solver can achieve any accuracy you whish since it has an error criteria that you define (the default is 2%).
D) With HFSS you can simulate also the feed structure.
E) And last (but not least) you have two frequency sweep options. The fast sweep is good when Fmax/Fmin < 5. If you require a broader sweep use the interpolating sweep. In any case, you can use fine frequency steps and a broad frequency range, without sacraficing simulation time.
Regards,
Itai