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:
Sep. 15, 1981
Filed:
May. 11, 1979
Konomu Sanpei, Katsuta, JP;
Tadaaki Fujii, Katsuta, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A standing wave ratio detecting apparatus is disclosed which comprises an integration circuit for integrating a traveling wave detection voltage V.sub.F, a comparator circuit for comparing the output voltage V'.sub.F of the integration circuit with a reflected wave detection voltage V.sub.R to a voltage E.sub.o proportional to the voltage ratio V.sub.R /V'.sub.F, a control circuit receiving the output voltage E.sub.o of the comparator circuit and turned on or off according as the output voltage E.sub.o is put in a high level or in a low level to lower or raise the output voltage V'.sub.F of the integration circuit, thereby conducting such a control as making the output voltage V'.sub.F approximately equal to said reflected wave detection voltage V.sub.R and maintaining the amplitude of the output voltage E.sub.o constant, a smoothing circuit for deriving an average voltage corresponding to the ratio V.sub.R /V.sub.F of the reflected wave detection voltage V.sub.R to the traveling wave detection voltage V.sub.F from the output voltage E.sub.o of the comparator circuit, and a meter for indicating the average voltage from the smoothing circuit.