Abstract
This paper presents the forcible resonant characteristics of a cutoff cavity-backed slot radiator. It has a feed post and a parasitic post inserted parallel to the slot width, done by adding a single external reactance to the top or the bottom side of the parasitic post. The basic radiator characteristics for a perfect matching to a 50-Ω coaxial line due to the connecting position of the external reactance are discussed. Comparisons show that the bandwidth of the top side loading is narrower than the bottom side loading case. The theoretical analysis is verified by the measured return loss.
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