Patent ID: 8427254

Claim:
An electronically driven automatic matching apparatus comprising: a matching device employing a plurality of ferrite phase shifters as a matching element, with a first end of each of said plurality of ferrite phase shifters being coupled with a lateral part of a first rectangular wave guide and a shortening plate being provided at a second end of each of said plurality of ferrite phase shifters, between a power supply and a load: each of said plurality of ferrite phase shifters comprising: a second rectangular waveguide; substantially sheet-like ferrites disposed to face each other with respective mounting surfaces thereof kept in tight contact with inner walls of wide surfaces of the second rectangular waveguide and dielectric layers provided on surfaces of the substantially sheet-like ferrites facing each other; and a coil wound around a periphery of the second rectangular waveguide in a position substantially corresponding to a position of the substantially sheet-like ferrites and through which a control current is passed, whereby electronic change of the control current changes a phase of the respective phase shifter to automatically match the power supply and the load.