Patent ID: 8547184

Claim:
A high-frequency coupler comprising: a ground; a coupling electrode which faces the ground and is supported so as to be separated by a negligible height with respect to a wavelength of a high-frequency signal; a resonating unit to increase a current flowing into the coupling electrode via a transmission path; a supporting unit which is connected to the resonating unit at about a center of the coupling electrode; and a short-circuiting unit to short-circuit tip portions of the coupling electrode to the ground, wherein an infinitesimal dipole constituted by a line connecting a center of charges accumulated in the coupling electrode and a center of mirror-image charges accumulated in the ground is formed, and the high-frequency signal is transmitted toward a high-frequency coupler of a communication partner side arranged to face each other so that an angle θ formed in a direction of the infinitesimal dipole is substantially 0 degrees.