A piezoelectric oscillator includes: a piezoelectric substrate having at least a vibrating part and a base part; an excitation electrode formed on the vibrating part; and an oscillation circuit formed on the base part. In one embodiment, the antenna may be mounted to the tire sidewall outside the body cords of the tire. The sheath may be expandable and held in an expanded condition as the body tissue to be resectioned is drawn into the sheath. The gaseous fluid of the pad fluid mixture typically contains at least 70 volume percent of the mixture. If the average is less than or equal to a threshold, a wireless transmission operation is enabled.