Su H.-JHuang H.-JHo H.-K.HSI-TSENG CHOU2022-04-252022-04-252021https://www.scopus.com/inward/record.uri?eid=2-s2.0-85123059451&doi=10.1109%2fICCE-TW52618.2021.9603057&partnerID=40&md5=fa7368afbfa004845f95553146a9b03chttps://scholars.lib.ntu.edu.tw/handle/123456789/607133Multibeam (MB) radiations of antenna arrays need effective beamforming networks (BFNs). This paper presents a fisheye lens-based BFN (FL-BFN) by parallel-plate sandwiched substrates. It implements the beam and antenna excitation ports on the half-circular circumference and straight-line boundaries. The rule to determine the positions of antenna elements is shown for easy design. The performance is validated by using it to excite a Vivaldi antenna array. Measurements over a prototype were performed to validate its feasibility with good agreements. ? 2021 IEEE.Antenna arrayBeamforming networkFisheye lensMulti-beam radiationParallel-plate substrateAntenna phased arraysBeam forming networksBeamformingLens antennasMultibeam antennasAntenna elementExcitation portFish-eye lensLine boundariesMultibeamsParallel platesPhased-arraysSubstratesconference paper10.1109/ICCE-TW52618.2021.96030572-s2.0-85123059451