| 摘要 |
A balun is provided to adjust phase difference of a balance signal simply without whole design tuning, by comprising a phase adjustment unit. A balun includes a first transmission line(210), a second transmission line(220), a third transmission line(230) and a phase difference adjustment unit. The first transmission line has a balance signal port(211). The second transmission line is connected to an unbalance signal port(221). The third transmission line is grounded while maintaining a fixed gap with the second transmission line. The phase difference adjustment unit adjusts the length of a ground(231) of the third transmission line. |
