Partial Ring Element with a Gap for Dual Frequencies Application

Abstract

The combination of partial and complete ring patch elements antenna produce a diversity of response with regards to the polarization. The patches have been designed to obtain dual frequencies for many applications such as in monopulse radar. Simple geometric design of a ring patch and the inclusion of a gap have been used to get the preferred resonant frequency. The gap size of 0.0 to 1.0 mm and gap's position at the top and right position of the ring have been used in this paper. The return loss and reflection phase are observed to study the element behavior. Analysis have shown that the element with smaller ring's width, $w$ will give steeper slope or curve that reduces its bandwidth performance. The partial ring, resulted from addition of gap also found to maintain or shift up the resonant frequency, depending on the position of the gap. As a result, the combination of partial and complete ring elements could be used as a reflector to realize monopulse mode of operation.