Design of a slot array antenna with ultra-wideband low-scattering characteristic

This paper presents a 4 × slot array antenna with ultra-wideband low-scattering characteristic, which integrates metasurface based on the multielement phase cancellation (MEPC) method. Limited by characteristics of array, contradiction between ideal radiation performance and requirement low radar cross section (RCS) has not been well resolved. Therefore, in this paper, MEPC-based is designed as cover-layer proposed antenna, can disperse reflected energy to more directions without degrading performance. The operates bandwidth 3.89–4.00 GHz maximum gain 14.3 dBi. Additionally, 7 dB RCS reduction for TE/TM polarization at normal incidence 5.5–40 (fh / fl = 7.27:1), achieving out-of-band reduction. Furthermore, remain stable large-angle oblique incidence. To verify feasibility design, prototype fabricated measured demonstration. simulated results are good agreement.