Patent ID: 8797122

Claim:
A butler matrix comprising: a plurality of input couplers that are positioned at an input end of the butler matrix, receive an input signal, and divide and output it to a plurality of paths; a plurality of output couplers that receive a signal from the input coupler and divide the signal into a plurality of paths to output it as an output signal; a plurality of transmission couplers that are respectively formed between the plurality of input couplers and the plurality of output couplers to transmit a signal output from the input coupler to the output coupler; a plurality of separation couplers that are respectively formed in intersecting paths including an intersecting section at which transmission paths intersect among a plurality of paths through which a signal is transmitted between the input coupler and the output coupler, and separate signals transmitted through different transmission paths; and a plurality of compensation couplers that compensate phase delays with signals transmitted on the path in which the compensation coupler is formed, wherein the plurality of separation couplers comprise: a plurality of first couplers that are formed in intersecting paths including an intersecting section at which transmission paths intersect among a plurality of paths between the input coupler and the transmission coupler; and a plurality of second couplers that are formed in intersecting paths including an intersecting section at which transmission paths intersect among a plurality of paths between the transmission coupler and the output coupler.