S. . Nouri, J. . Nourinia, N. . Valizade, B. . Mohammadi, and A. . Valizade, “Novel Compact Branch-Line Coupler Using Non-Uniform Folded Transmission Line and Shunt Step Impedance Stub With Harmonics Suppressions”, ACES Journal, vol. 31, no. 04, pp. 401–409, Aug. 2021.