Communication device and high-frequency coupler

A communication device comprising:

• a communication circuit unit processing a high-frequency signal transmitting data;
• a transmission path for the high-frequency signal, the transmission path being connected to the communication circuit unit;
• a ground;
• a coupling electrode supported by two terminals so as to face the ground and to be separated by a height negligible with respect to a wavelength of the high-frequency signal;
• and
• a resonating unit increasing a current flowing into the coupling electrode via the transmission path;
• wherein
• the resonating unit includes a first resonating unit connected to the transmission path and a second resonating unit having one end connected to the first resonating unit and another end short-circuited to the ground, the second resonating unit having the terminals of the coupling electrode connected thereto, and
• a microdipole is formed of a line segment connecting a center of charges stored in the coupling electrode and a center of mirror-image charges stored in the ground, and the high-frequency signal is transmitted to a distant side disposed so as to face the communication device with an angle A formed relative to a direction of the microdipole being approximately 0 degree.