The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 19, 2008
Filed:
Feb. 01, 2007
Daisuke Matsuno, Osaka, JP;
Daisuke Matsuno, Osaka, JP;
Daihen Corporation, Osaka, JP;
Abstract
An impedance matching apparatuscalculates a forward wave voltage Vfo and a reflected wave voltage Vro at an output terminal, based on a forward wave voltage Vfi and a reflected wave voltage Vri at an input terminal, on information on variable values of variable capacitors VC, VCacquired in advance through measurement, and on a T parameter of the impedance matching apparatuscorresponding to the information on the variable values of variable capacitors VC, VC. The impedance matching apparatuscalculates an input reflection coefficient Γi at the input terminalcorresponding to the information on the variable values of the variable capacitors VC, VC, based on the forward wave voltage Vfo, the reflected wave voltage Vro and the T parameter. The impedance matching apparatusselects the lowest absolute value out of absolute values |Γi| of the input reflection coefficients corresponding to the variable values of the variable capacitors VC, VC, and adjusts the impedance of the variable capacitors VC, VCbased on the lowest value.