Surface acoustic wave filter

A surface acoustic wave filter comprising

• a resonator pattern formed on a piezoelectric substrate,
• a ground pattern formed on said piezoelectric substrate, said ground pattern disposed at an outer shape of said resonator pattern, said ground pattern being grounded electrically,
• a through-hole provided near said resonator pattern,
• a conductive material filled in said through-hole, said through-hole filled with said conductive material being electrically grounded, and conductive material having a thermal conductivity, wherein a heat generated in said resonator pattern is released through said ground pattern and said conductive material,
• a package, and
• a conductive paste, said conductive paste having a thermal conductivity, wherein said conductive paste is disposed at a bottom of said piezoelectric substrate,
• said conductive paste is connected to said conductive material filled in said through-hole,
• a bottom of said piezoelectric substrate is fixed in said package through said conductive paste, and
• said heat generated in said resonator pattern is further released through said conductive material and said conductive paste.

A surface acoustic wave filter comprising

• a resonator pattern formed on a piezoelectric substrate,
• a through-hole provided near said resonator pattern, and
• a conductive material filled in said trough-hole, said conductive material having a thermal conductivity,
• an insulating material connected to said conductive material, said insulating material having a thermal conductivity,
• wherein said heat generated in said resonator pattern is released through said conductive material and said insulating material.