Abstract This paper presents the perfect match formula and perfect isolation formula for the parallel lines directional couplers in general case, and gives the necessary and sufficient condition by which match and isolation can be realized simu ltaneously.
Xuan Qiwo,Wu Ziqian,T. P. Leung. A NOTES ON THE PERFECT MATCH FORMULA AND PERFECT ISOLATION FORMULA FOR DIRE CTIONAL COUPLERS[J]. , 1990, 12(3): 317-322 .