Patent ID: 8422947

Claim:
A communication device, comprising: a communication circuit part that performs processing of a high-frequency signal for data transmission; a transmission path of said high-frequency signal; a ground; a coupler electrode that includes an upper flat part that acts as an electrode, a support that supports said upper flat part so that said upper flat part faces said ground and is separately placed from said ground at a height only enough to ignore the wavelength of said high-frequency signal, while having a flexible portion which is elastically deformable in the direction of said height, and a connecting portion where the other end of said support is connected to said transmission path; and a resonance part that enlarges a current flowing into said coupler electrode through said transmission path, wherein a micro dipole formed of a line segment that connects the center of an electric charge accumulated in said upper flat part of said coupler electrode and the center of a mirror charge accumulated in said ground is formed, and said high-frequency signal is transmitted to a communication partner oppositely arranged at an angle .theta. of substantially zero with respect to the direction of said mirco dipole.