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Superstrate-Enhanced Ultrawideband Tightly Coupled Array With Resistive FSS

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3 Author(s)
William F. Moulder ; ElectroScience Laboratory, Department of Electrical and Computer Engineering, The Ohio State University, Columbus, OH, USA ; Kubilay Sertel ; John L. Volakis

An efficient low-profile ultrawideband tightly coupled array employing a resistive frequency selective surface (FSS) and a superstrate is introduced. The FSS suppresses destructive ground plane interference, resulting in an increase in the array bandwidth by a factor greater than two. A superstrate is used to alleviate losses due to the resistive FSS. It is shown that a properly designed superstrate reduces losses by about 2.5 dB. The proposed array, which employs tightly coupled bowtie elements, achieves very low profile (0.055λlow) , 21:1 bandwidth, and radiation efficiency greater than 73% across the band. This paper presents the analysis and design of the array, particularly the FSS and superstrate. To validate the design, measurements of a prototype array are presented as well.

Published in:

IEEE Transactions on Antennas and Propagation  (Volume:60 ,  Issue: 9 )