Patent ID: 7770449

Claim:
A resistive-type humidity sensing structure with a microbridge, comprising: a substrate, having a first surface and a second surface, a first isolated layer being formed on said first surface, and a second isolated layer being formed on said second surface, and having an opening penetrating from said second isolated layer and passing through said first isolated layer to form a through hole after a bridge area is reserved in said first isolated layer; a sensing portion, consisted of a resistive sensing layer formed by patterning on said bridge area, and a humidity sensing layer covered on said resistive sensing layer, wherein variations of a length of a material of said resistive sensing layer causes variations in resistance, and a material of said humidity sensing layer changes its volume according to variations of humidity; and at least two measuring electrodes, formed on two ends of said resistive sensing layer of said sensing portion so as to fix said sensing portion on said first isolated layer, wherein said two measuring electrodes are formed by conductive metal or alloy material, so as to measure a resistance value of said resistive sensing layer, wherein said first isolated layer further comprises a temperature compensation sensing electrode formed on said first isolated layer by the material of said resistive sensing layer.