Title: Octave-Band Four-Beam Antenna Arrays with Stable Beam Direction Fed by Broadband 4 × 4 Butler Matrix
Authors: Andrzej Dudek, Piotr Kanios, Kamil Staszek * , Slawomir Gruszczynski and Krzysztof Wincza
Journal: Electronics
Publication type: article
DOI: 10.3390/electronics10212712