ALEXANDRIA, Va., July 9 -- United States Patent no. 12,355,401, issued on July 8, was assigned to Sumitomo Electric Industries Ltd. (Osaka, Japan).
"Doherty amplifier" was invented by Takashi Sumiyoshi (Osaka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A Doherty amplifier includes a divider configured to divide an input signal into two signals, a first amplifier configured to amplify one of the two signals and output the amplified signal to a first node, a second amplifier configured to amplify the other of the two signals and output the amplified signal to a second node, a balun including lumped parameter elements and configured to output a signal obtained by combining the signal output from the f...