Forcible Resonant Characteristics of a Cutoff Cavity-Backed Slot Radiator with a Single Reactance Loaded at the End of the Parasitic Post

Ki-Chai KIM  Kazuhiro HIRASAWA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E93-B   No.10   pp.2777-2780
Publication Date: 2010/10/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.2777
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Antennas and Propagation
Keyword: 
cavity-backed slot radiator,  forced resonance,  reactance loading,  

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Summary: 
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.