ALEXANDRIA, Va., Dec. 16 -- United States Patent no. 12,500,321, issued on Dec. 16, was assigned to KMW Inc. (Hwaseong-si, South Korea).
"Waveguide filter" was invented by Nam Shin Park (Hwaseong-si, South Korea) and Yeon Ho Shin (Yongin-si, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a waveguide filter having an enhanced property of a specific passband through cross coupling using a resonator, and can set cross coupling in a limited space by providing a notch post, simplify the complexity of a filter by allowing the properties or strength of the cross coupling to be changed according to the position or form thereof, and implement various filter performances."...