Patent ID: 8552821

Claim:
An electromagnetic resonance coupler for transmitting a signal between first resonant wiring and second resonant wiring without contact, the electromagnetic resonance coupler comprising: a first substrate; and a second substrate facing the first substrate, wherein the first resonant wiring and first input/output wiring are provided on the first substrate, the first resonant wiring having a loop shape that includes an inwardly recessed portion and an opening, and the first input/output wiring being connected to a first connection portion in the first resonant wiring, the second resonant wiring and second input/output wiring are provided on the second substrate, the second resonant wiring having the same wiring width and the same shape as the first resonant wiring, and the second input/output wiring being connected to a second connection portion in the second resonant wiring, when viewed in a direction perpendicular to a main face of the first substrate, the first resonant wiring and the second resonant wiring are symmetric with respect to a point, and contours of the first resonant wiring and the second resonant wiring match, a distance between the first resonant wiring and the second resonant wiring in a direction perpendicular to the main face of the first substrate is less than or equal to one half a wavelength of the signal, and in the first resonant wiring, at least part of wiring that constitutes the recessed portion is close to wiring other than the at least part of wiring that constitutes the recessed portion at a distance that is less than or equal to four times the wiring width of the first resonant wiring.