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A new λ/4 microstrip coupled line (MSCL) partially-narrowed and slotted the other part to obtain both tight coupling beyond machining limitations and high directivity is proposed. And a multi-element broadband coupler using the proposed MSCL as the tightest coupling element is presented. A multi-element 10 dB coupler is designed, and the performances, which are −10.3±0.9dB coupling and greater than...