Microwave circuit and method of manufacturing microwave circuit

摘要

A microwave circuit having a coupler with two microstrip conductors on a front surface of a substrate, parallel to each other, and electromagnetically coupled to each other with a coupling coefficient wherein the substrate has a rear surface on which a grounding conductor is formed. A floating conductor is interposed between the microstrip conductors. A first terminal of a switching device is connected to one end of the floating conductor while a second terminal of the switching device is grounded. By selectively turning on and off the switching device, the coupling coefficient is changed.