Babale, S. A. ., Rahim, S. K. A. ., Tan, K. G. ., Paracha, K. N. ., Butt, A. D. ., Lawan, S. H. . and Ali, I. . (2022) “PET-Based Instant Inkjet-Printed 4 × 4 Butler Matrix Beamforming Network”, Applied Computational Electromagnetics Society Journal (ACES), 37(02), pp. 199–208. doi: 10.13052/2022.ACES.J.370208.