Patent ID: 8686794

Claim:
An amplifying apparatus comprising: a first amplifier that amplifies a first signal of a constant amplitude; a second amplifier that amplifies a second signal identical in amplitude and differing in phase with respect to the first signal; a first transmission line of which, a first end is connected to an output terminal of the first amplifier; a second transmission line differing in length with respect to the first transmission line and of which, a first end is connected to an output terminal of the second amplifier and a second end is connected to a second end of the first transmission line; and an amplitude balance adjusting element that is connected to any one among the first transmission line and the second transmission line, wherein a signal that is a combination of an output signal of the first amplifier and an output signal of the second amplifier is output from a connection node of the first transmission line and the second transmission line, the amplitude balance adjusting element is an element that controls electrical characteristics thereof by a variation of voltage applied to the element, and the voltage is varied according to the signal output from the connection node.