Surface acoustic wave resonator for down-hole applications

A surface acoustic wave (SAW) tagging device comprising:

• a base comprising a lower cavity and an upper cavity being adjacent to each other, the base comprising an electrically conductive material;
• a dielectric disk having a lower surface and an upper surface, the dielectric disk adapted to fit in the upper cavity, the dielectric disk comprising a first through hole extending from the lower surface to the upper surface of the dielectric disk;
• an antenna substrate having a top surface and a bottom surface, the antenna substrate comprising a first via extending from the top surface to the bottom surface, the antenna substrate being adapted to fit in the upper cavity and on top of the dielectric disk;
• an antenna system on the top surface of the antenna substrate;
• a hermetically sealed enclosure comprising a SAW piezoelectric device in an interior of the enclosure and at least one electrically conductive connection extending from the interior of the enclosure to the exterior of the hermetically sealed enclosure, a first electrically conductive connection of the at least one electrically conductive connection being electrically connected to the SAW piezoelectric device;
• the hermetically sealed enclosure being adapted to fit in the lower cavity in a position below and adjacent to the dielectric disk such that the first conductive connection extends through the first through hole and through the first via to electrically connect to the antenna system;
• and
• a radio frequency transparent material on the exterior surfaces of base, the antenna substrate, the antenna system.