Abstract

Inspired from the filter-bank (FB) concept that is normally used for multirate signal processing, an FB-enabled array technique of leaky-wave antennas (LWAs) is proposed and studied for creating full-band-locked frequency-scanning radar systems in a stitched frequency-space domain. This is mainly for addressing the coupling dilemma between the range and angle resolutions that is historically and naturally inherited from a conventional frequency-scanning radar. FB-related conditions for the required "frequency-space stitching" (or full-band beam-target illumination) in radar operation are described and translated into the design specifications of an array of LWAs, such as engineered beam-scanning functions, beam-crossovers, and phase alignments. For a direct proof of concept, a practical two-channel LWA array is modelled, fabricated, and measured. Simulated and measured results are in a reasonable agreement, which exhibit the highly desired "frequency-space stitching" behaviour. The proposed FB-enabled array solution may present a potential competitor against the prevailing phased array.

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