Patent ID: 7102464
Filing Date: 2006-09-05
Classification: H03H

Abstract:
1. A circuit, comprising: a transmission line transformer coupled between an input port and an output port and configured to transmit energy from the input port to the output port by a transmission line mode, the transmission line transformer also being coupled to a ground return path, wherein the transmission line transformer provides an impedance transformation between the input and output ports; and an inductor, wherein the circuit is configured to selectively couple the inductor into the ground return path, whereby the impedance transformation changes depending upon whether the inductor is coupled into the ground return path, and wherein the transmission line transformer couples to the ground return path through a first node, and the inductor couples to the first node in parallel with a diode coupling to the first node such that the inductor is selectively coupled into the ground return path when the diode is non-conducting.