A Miniaturized Branch Line Coupler for 5G Dual Band Applications

This paper proposes a miniaturized dual-band branch-line coupler with an increased frequency ratio for 5G applications. In this design, a T-shaped line replaced the conventional line in which both the lines and stubs were folded to obtain a 46.62% size reduction compared to the standard one. Moreover, the design demonstrates an increased frequency ratio of 5 centered at 0.7 GHz and 3.5 GHz. The structure is designed on an RT/Duroid 5880 substrate and simulated using a CST-MW studio.