In this brief, a novel symmetrical broadband tight-coupled directional coupler with high directivity using three-folded-coupled lines is proposed and implemented. The directional coupler is consisted of two simple coupled lines… Click to show full abstract
In this brief, a novel symmetrical broadband tight-coupled directional coupler with high directivity using three-folded-coupled lines is proposed and implemented. The directional coupler is consisted of two simple coupled lines and two three-folded-coupled (TFC) lines, which realizes advantages of broadband, tight coupling, and high directivity. The TFC line is simplified as two-level coupled lines. Electrical lengths of coupled lines and precise mathematical equations for
               
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