Patent ID: 8440538

Claim:
A method of manufacturing an airbridge, comprising: forming a first spacer layer on a substrate including a semiconductor element so that the first spacer layer covers a component to be located below the airbridge, the first spacer layer having a width extending in a width direction of the airbridge and a first length extending in a length direction of the airbridge, the width direction being a direction in which space under the airbridge extends, the length direction being a direction in which the airbridge extends over and straddles the component to be located on the substrate, below the airbridge; forming a second spacer layer on the first spacer layer so that the first and second spacer layers are a layer stack structure having a stepped shape, in a cross section taken in a plane perpendicular to the width direction of the airbridge, the second spacer layer having a second length in the length direction of the airbridge, the second length being shorter than the first length of the first spacer layer, wherein the second spacer layer includes a plurality of layers, and dimensions of the plurality of layers of the second spacer layer, in the length direction, and thicknesses of the plurality of layers of the second spacer layer, decrease with distance from the first spacer layer; forming a material layer over the layer stack structure, without any heat treatment that deforms the layer stack structure, the material layer forming the airbridge; and after the forming of the material layer, removing the layer stack structure.