Patent ID: 8928428
Filing Date: 2015-01-06
Classification: H01P

Abstract:
1. A directional coupler, comprising: an input port; an output port; a coupled port; a ballasting port; a first transmission element having a first connection to the input port and a second connection to the output port; a second transmission element having a first connection to the coupled port and a second connection to the ballasting port; a first compensation capacitor connected to the input port and the coupled port; a second compensation capacitor connected to the input port and the ballasting port; and a third compensation capacitor connected to the coupled port and the ballasting port; wherein the first transmission element and the second transmission element are inductors, the first transmission element being inductively coupled to the second transmission element by a predefined coupling factor, the coupled port being isolated from the input port by a predefined first isolation factor, and the ballasting port being isolated from the input port by a predefined second isolation factor.