| 摘要 |
A transmission line substrate includes a spurious-wave suppression circuit (50). In the spurious-wave suppression circuit (50), a divider (51) divides a signal line of a driving control signal connected to a semiconductor device into two signal lines of the same phase. A delay unit (52) is connected to one of the two signal lines, and includes a signal line with a length of substantially one half of an in-substrate effective wavelength of a spurious wave. Parallel two lines (53) that include parallel two signal lines, on which spurious waves are in opposite phases, are connected to the delay unit (52) and the other one of the two signal lines, respectively. A resistor (55) is arranged on the parallel two lines (53), and connects between the parallel two signal lines. A combiner (54) includes a signal line that combines the parallel two signal lines, and outputs a combined signal to the outside. |
