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:
May. 27, 2014
Filed:
Jan. 20, 2011
Shuya Kishimoto, Tokyo, JP;
Shuya Kishimoto, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A 0-to-90-degree phase shifter () includes a voltage-variable power supply (), a transistor (), a 90-degree divider (), gain-variable amplifiers () (-and-), and a combiner (). The 90-degree divider () divides an input signal into a signal to which a 90-degree phase is given and a signal to which no phase is given, and outputs the divided signals to the gain-variable amplifiers (). The gain-variable amplifiers () (-and-) output signals whose amplitudes are changed according to a phase control amount to the combiner (). The combiner () combines the signals input from the two gain-variable amplifiers () and outputs the combined signal. The impedance between the source and the drain of the transistor connected to the isolation port of the 90-degree divider () can be changed as appropriate.