公开(公告)号：EP1433220B1

公开(公告)日：2011-12-14

申请号：EP02750194.9

申请日：2002-07-18

申请人： Cree, Inc.

发明人： CRESCENZI, Emil, James, Jr.

IPC分类号： H01P5/18 ,  H01P5/08

CPC分类号： H01P5/186 ,  H05K1/0237

摘要： A coplanar coupler (14) for use with microstrip input and output ports includes a printed circuit substrate in which first and second metal input ports are formed on a top surface and cooperate with a metal layer on the bottom surface as microstrip lines, and a first and second metal output ports formed on the top surface which cooperate with the metal layer on the bottom surface as microstrip lines. The metal layer (24) on the bottom surface functions as a ground plane for the input ports and output ports, the metal layer being removed in a coupler region underlying at least portions of the metal input and output ports and extending therebetween. First and second metal lines (31, 32) are formed on the bottom surface in the coupler region and function as a coplanar coupler for the input and output ports. Electrical vias in the substrate interconnect the ports and the coplanar coupler.