Antenna and circuit board

Abstract

Provided is an antenna that suppresses increase in passing loss when phase-shifting signals input from an antenna element throughout a wide frequency band. The antenna includes a power feeding circuit 20 that converts four input signals input with phase differences different by 90 degrees from an antenna element so that the four input signals have a same phase and outputs them as one combined signal from an output terminal s31. The power feeding circuit 20 includes a first phase circuit portion 200A that phase-shifts the four input signals and combines them two by two to output two first combined signals, and a second phase circuit portion 200B that phase-shifts each of the two first combined signals by 90 degrees by reversing a shift direction to combine the two first combined signals. The second phase circuit portion 200B includes cascade-type phase shifters 241, 242 in which two 45 degrees phase-shifters or three 30 degrees phase shifters are connected in series.

Dependencies are inferred from the claim text.