hi I'm trying to find the resonant lentgh of a waveguide slot array antenna by the admitance matrix, where the imaginary part will be zero.does ansoft hfss give a reliable answer?and also, I had problems setting the radiation boundaries for my structure, wich is much affected by its position and shape. Can someone provide me with some information about how to use the ansoft hfss for this purpose? regardshoda --------------------------------- Do you Yahoo!? The New Yahoo! Search - Faster. Easier. Bingo. ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu