A 3d broadband duallayer multiaperture microstrip directional coupler
Athree–dimensional(3-D)broadbanddual-layermultiaperaturemicrostripdirectionalcouplerispresentedinthispaper.Thedual-layer,multiaperaturedirectionalcouplerconsistsoftwo-layerback-to-backsubstrateswith15smallcouplingaperturesonthecentergroundplane.Anovelrectangularmultiaperaturecouplingstructurew
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