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coupler Type Working frequency (GHz) Insert loss (dB) Stopband frequency (GHz) Dimensions (mm) 1 0.337-0.343(-1dB) -1.5 0.349,≥45dB 280*187*40 2 0.735-0.795(-1dB) -1.5 0.815,,≥50dB 140*65*20 3 0.774-0...