| Popis: |
Introduction Wideband, low-cost, and low-profile modular phased arrays are in high demand for future mutlifunctional systems. Currently, low-profile ultrawideband arrays such as the current sheet array (CSA) [1] or the fragmented aperture array (FSS) [2] use printed layers, but rely on 3D machined feed organizers and external wideband baluns that contribute to cost and limit modularity and scaling to higher frequencies. This paper presents the Planar Ultrawideband Modular Array (PUMA), a fully planar implementation of Wheeler's current sheet [3] requiring no feed organizers or external baluns, that can be fabricated entirely using standard planar microwave circuit processes. This allows for low-cost aperture fabrication, high volume production and frequency scalability. The unique feed arrangement of PUMA allows for a modular egg-crate construction, with direct connection to standard 50Ω interfaces, and low profile (≈ λ/3 at its highest frequency). Predicted dual-polarized infinite array performance has demonstrated a 3:1 bandwidth (7–21GHz) and scanning with VSWR < 2.2 out to θ = 45° in all planes. Measurements of a 16×16×2 array are currently in progress. |
