Diode mixer

A diode mixer comprising:

• a semiconductor section having a first circuit element unit including an inductor and a capacitor connected in series, a first diode having an anode and a cathode and connected in parallel with the first circuit element unit, a first connecting portion to which a first end of the first circuit element unit and the anode of the first diode are connected, and a second connecting portion to which a second end of the first circuit element unit and the cathode of the first diode are connected;
• a first signal input/output terminal coupled to the first connecting portion of the semiconductor section and receiving a first signal;
• a first branching circuit disposed between the first signal input/output terminal and the first connecting portion of the semiconductor section;
• second and third branching circuits:
• a second signal input/output terminal coupled to the semiconductor section through the second branching circuit;
• and
• a third signal input/output terminal coupled to the semiconductor section through the third branching circuit, wherein the inductor and a capacitive component of the first diode constitute a resonant circuit with respect to the first signal.