ALEXANDRIA, Va., Feb. 24 -- United States Patent no. 12,562,447, issued on Feb. 24, was assigned to SAAB AB (Linkoping, Sweden).
"Compact balun with out-of-band spurious suppression" was invented by Sten Gunnarsson (Jarfalla, Sweden) and Dan Kuylenstierna (Ojersjo, Sweden).
According to the abstract* released by the U.S. Patent & Trademark Office: "A balun circuit is disclosed. The balun circuit has an unbalanced port and a balanced port, wherein the balanced port comprises a first terminal, and a second terminal. The balun circuit further comprises a main line having a first end and a second end, the first end being coupled to the unbalanced port. Moreover, the balun circuit comprises a first sub-line electromagnetically coupled to the m...