Patent ID: 8063715
Filing Date: 2011-11-22
Classification: H01P

Abstract:
1. A directional coupler comprising: a first substrate including a first principal surface and a second principal surface that counters said first principal surface; a first transmission line formed on said first principal surface of said first substrate; a second transmission line formed on said first principal surface of said first substrate; and a coupling substrate including a third transmission line and a fourth transmission line forming a first coupling part, said coupling substrate being attached to said first substrate so that said first coupling part is inserted in said first transmission line and said second transmission line wherein said coupling substrate includes a first base layer having a third principal surface and a fourth principal surface that counters said third principal surface, said third transmission line is formed on said third principal surface of said first base layer, said fourth transmission line is formed on said fourth principal surface of said first base layer, and said coupling substrate is attached to said first principal surface of said first substrate so that said third principal surface of said first base layer counters said first principal surface of said first substrate wherein said first transmission line and said second transmission line have a region in which said first transmission line and said second transmission line are close and are parallel and said first transmission line and said second transmission line form a second coupling part at said region.