A coupler for proximity wireless communication primarily based on an electric induction field generated therein, includes a substrate, a ground layer formed on a first region of the substrate and surrounding a second region of the substrate on three sides of the second region, a fourth side of the second region being defined by an edge of the substrate, and a coupling element electrically isolated from the ground layer and formed on the second region of the substrate. The coupling element includes a first portion that extends adjacent to and along the edge of the substrate and a second portion that is electrically connected to the first portion, extends inwardly from the edge of the substrate, and includes an inductor.