Abstract: A gallium nitride (GaN) substrate, a semiconductor device, and methods for fabricating a GaN substrate and a semiconductor device are provided. The GaN substrate includes: a GaN base; an aluminum gallium nitride (AlGaN) layer, disposed on the GaN base; and a p-type conducting layer disposed on an active area of the AlGaN layer, and used to exhaust surface state negative electrons on the AlGaN layer and neutralize a dangling bond on the AlGaN layer. The p-type conducting layer is formed on the AlGaN layer, and a hole charge carrier in the p-type conducting layer can be used to exhaust the surface state negative electrons on an n-type AlGaN layer, neutralize the dangling bond on a section of the AlGaN layer, and prevent the forming of a virtual gate, so as to suppress a current collapse effect of the semiconductor device fabricated using the GaN substrate.

Abstract: A gallium nitride (GaN) substrate, a semiconductor device, and methods for fabricating a GaN substrate and a semiconductor device are provided. The GaN substrate includes: a GaN base; an aluminum gallium nitride (AlGaN) layer, disposed on the GaN base; and a p-type conducting layer disposed on an active area of the AlGaN layer, and used to exhaust surface state negative electrons on the AlGaN layer and neutralize a dangling bond on the AlGaN layer. The p-type conducting layer is formed on the AlGaN layer, and a hole charge carrier in the p-type conducting layer can be used to exhaust the surface state negative electrons on an n-type AlGaN layer, neutralize the dangling bond on a section of the AlGaN layer, and prevent the forming of a virtual gate, so as to suppress a current collapse effect of the semiconductor device fabricated using the GaN substrate.

Abstract: A capacitive switch includes: a first conductive cantilever, a second conductive cantilever, a substrate, a coplanar waveguide arranged on the substrate, the coplanar waveguide includes a first conductor configured to transmit an electrical signal, a second conductor and a third conductor are arranged as ground wires on two sides of the first conductor; an insulation medium layer is arranged on the first conductor, a conducting layer is arranged on the insulation medium layer; the first conductive cantilever is connected to the second conductor by using a first fixed end, the second conductive cantilever is connected to the third conductor by using a second fixed end; when a direct-current signal is transmitted on the capacitive switch, a first free end of the first conductive cantilever and a second free end of the second conductive cantilever contact the conducting layer.

Abstract: A capacitive switch includes: a first conductive cantilever, a second conductive cantilever, a substrate, a coplanar waveguide arranged on the substrate, the coplanar waveguide includes a first conductor configured to transmit an electrical signal, a second conductor and a third conductor are arranged as ground wires on two sides of the first conductor; an insulation medium layer is arranged on the first conductor, a conducting layer is arranged on the insulation medium layer; the first conductive cantilever is connected to the second conductor by using a first fixed end, the second conductive cantilever is connected to the third conductor by using a second fixed end; when a direct-current signal is transmitted on the capacitive switch, a first free end of the first conductive cantilever and a second free end of the second conductive cantilever contact the conducting layer.