Petropoulos, IoannisVoudouris, Konstantinos N.Abd-Alhameed, RaedJones, Steven M.R.2016-03-102016-03-102015-09Petropoulos I, Voudouris K, Abd-Alhameed RA et al(2015) Beam-forming module for backhaul link in a Relay-aided 4G network. AEU - International Journal of Electronics and Communications. 69(9): 1321-1327.9000258690009854http://hdl.handle.net/10454/7882YesA novel beam-forming module based on Wilkinson power divider technology, including attenuators and phase shifter chips is designed, fabricated and evaluated to be incorporated in a Relay Station connecting it with the Base Station under a 4G network. The proposed module is a 1:8 port circuit, utilizing two substrates, providing approximately 700 MHz bandwidth over 3.5 GHz frequency band and less than −20 dB transmission line coupling. Moreover an external control unit that feeds the beam-forming module with code-words that define the proper amplitude/phase of the excitation currents is established and described. The presented module is connected to a planar array and tested for two beam-forming scenarios, providing satisfactory radiation patterns.en© 2015 Elsevier. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license (http://creativecommons.org/licenses/by-nc-nd/4.0/)Beam-forming; Relay Station; Wilkinson power divider; Attenuators; Phase shiftersArticlehttps://doi.org/10.1016/j.aeue.2015.05.018