ALEXANDRIA, Va., May 19 -- United States Patent no. 12,633,639, issued on May 19, was assigned to National Tsing Hua University (Hsinchu, Taiwan) and National Synchrotron Radiation Research Center (Hsinchu, Taiwan).

"Planar balun and power amplifier using the planar balun" was invented by Tsun-Hsu Chang (Hsinchu, Taiwan), Tsung-Chi Yu (Hsinchu, Taiwan) and Cheng-Hsuan Chan (Hsinchu, Taiwan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A planar Balun used in solid-state microwave generator and radio frequency component manufacturing includes an upper coupling line, a lower coupling line and a delay line segment. The upper coupling line comprises two coupling line segments connected in series by the delay lin...