Patent ID: 9706656
Date: 2017-07-11
CPC Classifications: H05K

Claim:
1. A signal transmission board, comprising: a substrate having a first external surface and a second external surface that are opposite to each other; a cavity disposed in the substrate; a conductive via having a first end and a second end that are opposite to each other, the conductive via penetrating through the first external surface of the substrate, the cavity and the second external surface of the substrate in sequence, the first end of the conductive via being disposed on the first external surface, and the second end of the conductive via being disposed on the second external surface; and a connecting hole having a third end and a fourth end that are opposite to each other, the connecting hole being disposed on the substrate, the third end of the connecting hole being disposed on the first external surface, and the fourth end of the connecting hole communicating with the cavity.