allintitle: build microstrip

hi guys, i was wondering if i could get help in building a microstrip spiral antenna to meet uwb standard but with the frequency scaled down to occupy 1-3GHz. i have done some research on this but its all kind of hard to understand and i dont really know were to start.I am planning on using cst software but cant seem to get the hang of it.

please check on IEEE
by the way

this type of design need a complicated mathematics