Patent ID: 6640643
Filing Date: 2003-11-04
Classification: G01L

Abstract:
A capacitive pressure sensor comprising:a substrate; a first capacitive portion including a first lower electrode on a surface of said substrate and a first upper electrode facing said first lower electrode with a first cavity space between said first lower electrode and said first upper electrode, said first upper electrode being supportable by said substrate to define a first diaphragm structure; a second capacitive portion including a second lower electrode on said surface of said substrate and a second upper electrode facing said second lower electrode with a second cavity space between said second lower electrode and said second upper electrode, said second upper electrode being supportable by said substrate to define a second diaphragm structure; a lower insulation layer on said substrate and an upper insulation layer on said lower insulation layer extending substantially between said first and second capacitive portions; and a communicating structure for providing fluid communication between said first and second cavity spaces, wherein said communicating structure comprises a channel having a width in a direction perpendicular to an extending direction of said channel that is smaller than widths of said first and second capacitive portions in said direction, wherein said channel is provided between said lower and upper insulation layers.