SURFACE ACOUSTIC WAVE APPARATUS

摘要

A surface acoustic wave apparatus has a laminated ceramic substrate in which a phase unit is disposed inside of the laminated ceramic substrate. A surface acoustic wave device is secured to the laminated ceramic substrate. The phase unit is configured by forming a first ground electrode above a signal line and a second ground electrode below the signal line in the laminated ceramic substrate. The laminated ceramic substrate is made from a low-permittivity ceramic having a relative dielectric constant of about 7 or less.