Patent ID: 8594564

Claim:
A communication apparatus, comprising: a substrate including a ground electrode; a communication unit provided on a first main surface of the substrate; a first signal line provided on the first main surface of the substrate, the first signal line having one end connected to the communication unit; a coaxial line provided at a first main surface side of the substrate, the coaxial line including a second signal line and a third signal line, the third signal line provided at an outside of the second signal line through a dielectric, the second signal line having one end connected to the other end of the first signal line, the third signal line having one end connected to the ground electrode through a via; and an electrode unit including a reference potential electrode and a signal electrode, the signal electrode having a distance from the reference potential electrode and provided around the reference potential electrode, the reference potential electrode connected to the other end of the third signal line, the signal electrode connected to the other end of the second signal line, wherein data communications are performed by use of an electrostatic coupling formed between the electrode unit and a living body.