Wireless IC device

A wireless IC device, comprising:

• a wireless IC chip including input and output terminals defining a first terminal and a second terminal and arranged to process transmission and reception signals;
• a feeder circuit board including a feeder circuit, the feeder circuit including at least one of a resonator circuit and a matching circuit, the feeder circuit including a first coupler and a second coupler, each coupler including an inductance element;
• and
• a first radiation plate including a first mount having the feeder circuit board mounted thereon, and a second radiation plate including a second mount having the feeder circuit board mounted thereon, each of the first and second radiation plates being made of a metal;
• wherein
• an electromagnetic coupler module having the feeder circuit board and the wireless IC chip mounted on the feeder circuit board is arranged with the first and second terminals of the wireless IC chip electrically connected to the first and second couplers, respectively;
• the first coupler is electromagnetically coupled with the first mount and the second coupler is electromagnetically coupled with the second mount;
• the wireless IC chip is arranged to be operated by the first and second couplers in response to a signal received by the first and second radiation plates, and a response signal from the wireless IC chip is radiated to the outside from the first and second radiation plates via the first and second couplers;
• the first coupler and the second coupler are arranged so as to overlap the first mount and the second mount, respectively, in a direction perpendicular to a main surface of the first and second radiation plates and a main surface of the electromagnetic coupler module;
• each of the first mount and the second mount includes first and second opposed edges;
• the first coupler is arranged such that the first coupler extends outward from the first edge of the first mount and extends outward from the second edge of the first mount along an entire length of the first coupler;
• and
• the second coupler is arranged such that the second coupler extends outward from the first edge of the second mount and extends outward from the second edge of the second mount along an entire length of the second coupler;
• and
• each of the first coupler and the second coupler extends a plurality of times across the first and second edges of the first and second mounts along an entire length of the first coupler and the second coupler.