The moment method solution in the spectral domain is used to determine
the current distribution and the field of a short constant-width slot
antenna (CWSA). For the first time, the farfield radiation patterns o
f a CWSA with a length of 1 lambda(g) (where lambda(g), is the wavelen
gth of the slot in the front of the antenna) are presented. The comput
ed H-plane radiation pattern shows a large sidelobe. This is verified
experimentally.