Best numerical tehniques for simulating UWB antennas?

I think for large structures you need FDTD, for smaller ones MoM may be employed, for very small strucutres FEM can also be used

you may also use the MOM or FEM method combine the AWE method.

Since you're simulating UWB antenna you need results for a large number of frecuencies so you should use a time domain method like FDTD which generates results for many frecuencies at the same time.

i think cst mws is suitable fo the simulation of uwb antenna. its transient analysis is very good !

sorry IICCEE what do you mean by the AWE method, I haven't heard of it before?

AWE is the Asymptotic Waveform Evaluation method. It expands the matrix elements in a Taylor series with respect to frequency to evaluate the derivative of the Z matrix with respect frequency. The derivatives you have the greater the bandwith of your approximation.

Almost every frequency domain comercial solver uses some variation of this method to compute a frequency sweep. For instance ALPS is essentialy the same but a Pade expansion instead of a Taylor series. Computing every frequency point is very wasteful.

thank you very much wiley for your brief description. Actually I became very interested, is there some place where I can get more details?

Doing a google search on "asymptotic waveform evaluation" yields a multitude of papers. One paper seemed like a good place to start:

http://ntrs.nasa.gov/archive/nasa/ca...1997004960.pdf

Another reference which also contains a good background is Miller and Sarkar's chapter in "Frontiers in Electromagnetics", Werner and Mittra eds.

I think cst microwave studio which is based on finite integration method is better that xfdtd. The former can mesh the structure in nonuniform way which can save a lot of computer resource and time with the same accuracy with that using xfdtd.

Why not HFSS or IE3D