Patent ID: 9166559
Filing Date: 2015-10-20
Classification: H03H

Abstract:
1. A composite circuit module comprising: a circuit module including: a motherboard on which the circuit module is mounted; wherein the ceramic multilayer substrate includes a substrate body including a first main surface and a second main surface and a first connection terminal disposed on the second main surface; the surface acoustic wave filter is disposed on the first main surface; the ceramic multilayer substrate is mounted on the motherboard via the first connection terminal; the piezoelectric substrate, the ceramic multilayer substrate, the cover layer, and the motherboard have substantially the same coefficient of linear expansion; a Young's modulus of the piezoelectric substrate is larger than a Young's modulus of the ceramic multilayer substrate, a Young's modulus of the cover layer, and a Young's modulus of the motherboard; the Young's modulus of the ceramic multilayer substrate is larger than the Young's modulus of the motherboard and the Young's modulus of the cover layer; the Young's modulus of the motherboard is larger than the Young's modulus of the cover layer; and the Young's modulus of the ceramic multilayer substrate is from 70/9 to 80/9 times the Young's modulus of the cover layer and from 7/30 to 2/5 times the Young's modulus of the piezoelectric substrate.