Product Overview Mini-Circuits’ EDC21-24+ is a 21 dB directional coupler that operates from 4 to 20 GHz packaged in MCLP 4 x 4mm, 24-lead package. It provides excellent coupling flatness over a broad bandwidth and good return loss. This coupler also provides a quadrature phase shift between the signal at the through port and coupler port. Manufacturing using GaAs Technology, this model results in relatively high repeatablility in performance.