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. 28, 2002
Filed:
Oct. 05, 2000
Kazuhiko Honjo, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A circuit connected between an output terminal of an amplification transistor and a resistor for dealing with higher harmonics included in an output signal transmitted from the amplification transistor, includes (a) a first transmission line having an input terminal electrically connected to the output terminal of the amplification transistor, and having a length of &lgr;/4 wherein &lgr; indicates a wavelength of a fundamental harmonic, (b) a first group of transmission lines, including N transmission lines electrically connected in parallel with one another to an output terminal of the first transmission line, wherein N is an integer equal to or greater than 1, each of the N transmission lines having a length L defined by the following equation: L=&lgr;/4(1+M) (M=1, 2, 3, - - -, N) each of the N transmission lines having an open end, and (c) a second group of transmission lines, including N transmission lines electrically connected in parallel with one another to an output terminal of the first transmission line, each of the N transmission lines having a length Lh defined by the following equation: Lh+L=&lgr;/2, each of the N transmission lines having an open end.