RESONANT SHUNT SLOTS ON OPPOSITE BROAD WALLS OF A RECTANGULAR WAVEGUIDE AND THEIR ARRAYS.

The paper deals with the study of doublet structures formed by two identical slots on the opposite broadwalls of a standard X-band rectangular waveguide such that their centres coincide with the same transverse plane. Two types of doublets - staggered and look-through - are studied as primary radiators and it is shown that each doublet may be treated as a single slot radiating both ways about the waveguide with their equivalent shunt conductances being the same as that of an individual slot in the look-through case and it is the double of that of a single slot in the staggered case. Two resonant broadside arrays of such doublets have been designed and experimentally found to have a near omnidirectional coverage.