Patent ID: 6104240
Filing Date: 2000-08-15
Classification: H01P

Abstract:
A microwave circuit comprising:a substrate having first and second surfaces parallel to each other;two microstrip conductors on the first surface of said substrate, parallel to each other, electromagnetically coupled to each other, and having a coupling coefficient;a grounding conductor on the second surface of said substrate;a plurality of floating conductors on the first surface of said substrate, arranged parallel to each other and interposed between said two microstrip conductors; anda plurality of switching devices having respective first and second terminals, the first terminal of each switching device being connected to a corresponding one of said floating conductors, and a second terminal that is grounded, said switching devices being selectively turned on and off, wherein said substrate, said two microstrip conductors, and said grounding conductor constitute a coupler, said floating conductors being grounded when corresponding switching devices are turned on, said floating conductors having a floating potential when corresponding switching devices are turned off, and the coupling coefficient is stepwise changed by turning on or off said switching devices.