Abstract
This paper presents some numerical and experimental results in respect of reduction of the scattering properties of phased arrays outside their operating range using the band-stop frequency-selective structures (FSS). It reviews the phenomenon of incomplete non-suppression of separate Bragg lobes being caused by the formation of a Fabry-Perot cavity between the FSS and the conductive screen of the phased array. The reviewed approach has been applied to reduce the BSP of the L-band phased array on the basis of the Vivaldi radiator. The matching characteristics have been obtained (SWR < 2 with in-phase excitation and SWR < 3, when phased by beam at −45° direction) and the PA directionality. An integrated use of the band-stop FSS and absorbent material has allowed the amplitude of Bragg lobes to be reduced by 5–20 dB within the 8–18 GHz frequency band.
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