Transmission circuit and composite transmission circuit

A composite transmission circuit configured to be connected to an antenna, the composite transmission circuit comprising at least:

• a first transmission circuit having a first characteristic related to a capacitance value and a resistance value;
• a second transmission circuit having a second characteristic different from the first characteristic with respect to a capacitance value and a resistance value;
• and
• a third transmission circuit having a third characteristic different from the first characteristic and the second characteristic with respect to a capacitance value and a resistance value,
• the composite transmission circuit comprising
• a switch control circuit configured to selectively connect the first transmission circuit, the second transmission circuit, and the third transmission circuit to the antenna, wherein
• each of the first transmission circuit, the second transmission circuit, and the third transmission circuit comprises:
• a plurality of impedance circuits having different impedance from each other;
• a plurality of switch elements each of which is connected to a respective one of the plurality of impedance circuits;
• and
• a control circuit configured to control opening/closing of the plurality of switch elements, and
• the control circuit is controllable to selectively change the opening/closing of the plurality of switch elements and to rotate a reflection coefficient of an output terminal on the antenna side in a complex plane.