Abstract: A power combiner includes a first substrate provided with a first microstrip line, a second substrate provided with a second microstrip line, and a hollow waveguide having a metal film on an inner wall of a hollow and coupled to the first microstrip line and the second microstrip line, the hollow waveguide combining a first electric power transmitted through the first microstrip line and a second electric power transmitted through the second microstrip line and transmitting a combined electric power.

Abstract: An impedance converter includes an insulating layer; a first wire provided on a first surface of the insulating layer and extending in a first direction; a second wire provided on a second surface of the insulating layer and extending in the first direction and face the first wire, the second surface being located on a side opposite to the first surface; a third wire provided on the first surface and extending in a second direction orthogonal to the first direction; a fourth wire provided on the second surface and extending in the second direction and face the third wire; a fifth wire provided on the first surface and extending in the second direction; and a sixth wire provided on the second surface and extending in the second direction and face the fifth wire.

Abstract: A power combiner includes a first substrate provided with a first microstrip line, a second substrate provided with a second microstrip line, and a hollow waveguide having a metal film on an inner wall of a hollow and coupled to the first microstrip line and the second microstrip line, the hollow waveguide combining a first electric power transmitted through the first microstrip line and a second electric power transmitted through the second microstrip line and transmitting a combined electric power.

Abstract: An impedance converter includes an insulating layer; a first wire provided on a first surface of the insulating layer and extending in a first direction; a second wire provided on a second surface of the insulating layer and extending in the first direction and face the first wire, the second surface being located on a side opposite to the first surface; a third wire provided on the first surface and extending in a second direction orthogonal to the first direction; a fourth wire provided on the second surface and extending in the second direction and face the third wire; a fifth wire provided on the first surface and extending in the second direction; and a sixth wire provided on the second surface and extending in the second direction and face the fifth wire.

Abstract: A distributed amplifier includes a plurality of transistors, a first line connecting gate electrodes of the transistors to each other, and a second line connecting drain electrodes of the transistors to each other, wherein the first line and the second line are electromagnetically coupled to each other at a position situated between immediately adjacent transistors among the plurality of transistors.

Abstract: A distributed amplifier includes a plurality of transistors, a first line connecting gate electrodes of the transistors to each other, and a second line connecting drain electrodes of the transistors to each other, wherein the first line and the second line are electromagnetically coupled to each other at a position situated between immediately adjacent transistors among the plurality of transistors.