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:
Oct. 20, 2020
Filed:
Jun. 30, 2015
Hitachi Kokusai Electric Inc., Tokyo, JP;
HITACHI KOKUSAI ELECTRIC INC., Tokyo, JP;
Abstract
A matching box comprises a directional coupler that detects forward waves and reflected waves; a matching circuit having a first variable capacitance capacitor, a second variable capacitance capacitor, and inductance; and a control unit that calculates a reflection coefficient on the basis of the forward waves and the reflected waves, and controls a capacitance value VCof the first variable capacitance capacitor and a capacitance value VCof the second variable capacitance capacitor, wherein the control unit changes VCif the distance between a matching circle drawn by the trajectory of the reflection coefficient passing through a matching point on a Smith chart, and the calculated reflection coefficient is greater than a prescribed value, and changes VCif such distance is set to be no greater than the prescribed value and when the value of such distance becomes no greater than the prescribed value, thereby reducing the reflection coefficient.