ALEXANDRIA, Va., June 16 -- United States Patent no. 12,308,503, issued on May 20, was assigned to Advantest Corp. (Tokyo).
"Frequency selective electrical filter" was invented by Giovanni Bianchi (Ehningen, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "Embodiments of the present invention provide an electrical filter structure having a direct-coupled-stub filter (DCSF). The lengths of the transmission line portions can be arranged such that electrical lengths of the transmission line portions are shorter, by at least 10 percent, than a fourth of a wavelength of a signal having a frequency of a passband center frequency of the electrical filter structure. Moreover, lengths of the stubs can be select...