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Continue to ChatA miniaturized 180° hybrid ring coupler - https://avesis.istanbul.edu.tr/yayin/77e3e2b5-f319-48a3-8416-8ec25d95d396/a-miniaturized-180-hybrid-ring-coupler
A miniaturized 180° hybrid ring coupler - https://avesis.istanbul.edu.tr/yayin/77e3e2b5-f319-48a3-8416-8ec25d95d396/a-miniaturized-180-hybrid-ring-coupler