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Articles

Flat-base broadband multibeam Luneburg lens for wide-angle scan

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Pages 1329-1341 | Received 15 Oct 2014, Accepted 16 Apr 2015, Published online: 01 Jun 2015
 

Abstract

In this paper, we present the design of a flat-base Luneburg type of lens antenna, designed for wide-angle scan. The antenna consists of a 11-layer lens, fed at its base by a array of waveguides. The lens is broadband and has a high aperture efficiency, only 1 dB below that of a reference aperture antenna with uniform amplitude and phase distributions. Its sidelobe level is –21 dB at boresight and –13 dB when the scan angle is . It shows good performance when compared to the flat Luneburg lens previously reported in the literature, in terms of gain, scan capability, as well as ease of fabrication. It is shown to have the capability of producing multiple beams simultaneously, multiple angle, scan capability. Two different methodologies have been used to design the feed array of waveguides for the lens. The first of these utilizes a conventional perfect electric conductor waveguide, while the second employs materials for the guided wave region that has a high permittivity at frequencies at which metals become lossy and plasmonic. The performance of the lens has been investigated in this paper for both of these feed array designs.

Notes

No potential conflict of interest was reported by the authors.

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