Cylindrical array of EBG sectoral antennas for Radar applications

Abstract

This paper presents an additional work on a previous EBG cylindrical antenna in order to conceive a steerable antenna for Radar applications which require the coverage of the horizontal plane with a high gain (higher than 25 dB). The already designed antenna provides 18 beams with 15 dBi of maximum directivity. That is why some modifications were applied on it in order to obtain more beams in the horizontal plane (30 beams) and increase its gain. Moreover, the theories of cylindrical arrays in the horizontal plane and the multi-feed in the vertical plane are used which allows further gain improvement and reaching the required one.

Analysis by Asymptotic Boundary Conditions of Strip-Grated Dielectric Pipe Over Dielectric Rod With Wide Total Band-Gap as Multifrequency Cylindrical Leaky-Wave Antennas

“…Among these, many have not even presented anything that properly quantifies or conveys the bandgaps (widths and ranges) of their EBG structures, such as those of [3], [4], [6], [22], [24], [38]- [42]. For the rest (of those without dispersion diagrams) that have at least exhibited some form of EBG characterization, they were through the spectra of transmission/transmittance or mutual coupling [20], [23], [26], [30], [31], [43]- [55], all of which lack the theoretical rigor and scientific depth of the dispersion approach. Such spectra could at best be validations of the latter but should not supersede it as the sufficient portrayal of EBG phenomena in the first place.…”