Patent Number: 8,797,122

Title: Butler matrix

Abstract: A butler matrix includes at least one input coupler that is positioned at an input end of the butler matrix, receives an input signal, and divides and outputs it to a plurality of paths, and at least one output coupler that receives a signal from the input coupler and divides the signal into a plurality of paths to output it as an output signal. A separation coupler is formed in an intersecting path including an intersecting section at which transmission paths intersect among a plurality of paths through which a signal is transmitted to separate signals transmitted through different transmission paths. Further, a compensation coupler is formed in a path excluding the intersecting path to compensate a phase difference.

Inventors: Lee; Hongyeol (Chungcheongbuk-do, KR), Uhm; Man Seok (Daejeon, KR), Yun; So-hyeun (Daejeon, KR), Kwak; ChangSoo (Daejeon, KR), Choi; Jang-sup (Daejeon, KR), Yom; In Bok (Daejeon, KR)

Assignee: Electronics and Telecommunications Research Institute

International Classification: H01P 5/12 (20060101); H01Q 3/00 (20060101)

Expiration Date: 8/05/12018