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:
Jul. 21, 2020
Filed:
Apr. 13, 2017
Cape Peninsula University of Technology, Bellville, Cape Town, ZA;
Safari Mugisho Moise, Cape Town, ZA;
Clive Whaits, Cape Town, ZA;
Cape Peninsula University of Technology, Bellville, Cape Town, ZA;
Abstract
A power amplifier is provided having an input for receiving a signal to be amplified that is associated with a fundamental frequency. An amplifier circuit of the power amplifier includes an active device for amplifying the input signal and an output for providing the amplified signal to a load. A load network is electrically interposed between the amplifier circuit and the output and includes fundamental frequency matching circuitry which presents an optimal resistance at the fundamental frequency. The load network further includes a parallel transmission line arrangement having, at the fundamental frequency, a one-eighth wavelength short-circuited stub and a one-eighth wavelength open-circuit stub. The fundamental frequency matching circuitry and the parallel transmission line arrangement cooperate such that the load network operatively presents an optimal resistance at the fundamental frequency, an open-circuit at a second harmonic frequency and a short-circuit at a third harmonic frequency.