Circuit substrate and branch circuit

A circuit substrate for use in a branch circuit that includes an input path, a first output path including a high pass filter and connected to the input path, and a second output path including a low pass filter and connected to the input path, the circuit substrate comprising:

• a substrate body;
• an input signal line conductor with which the substrate body is provided and which is included in the input path;
• a first mounting portion provided on a main surface of the substrate body, included in the first output path and on which the high pass filter is mounted;
• at least one first output signal line conductor with which the substrate body is provided and which is included in the first output path;
• and
• a second mounting portion provided on the main surface of the substrate body, included in the second output path and on which the low pass filter is mounted;
• wherein
• the first output signal line conductor provided farthest upstream in a propagation direction of a signal is connected to the input signal line conductor via a first lumped-parameter element mounted on the main surface of the substrate body.