Broadband Equal-Split Directional Couplers Composed of Cascade- and Tandem-Connected Coupled-Line Sections Having Unequal Lengths. - Kinga Gawel; Magda Kalawska; Kamil Staszek; Robert Smolarz; Slawomir Gruszczynski; Krzysztof Wincza (IEEE Access, 2021)