Patent ID: 8581112

Claim:
A coupler apparatus comprising: a coupling element comprising a conductive material, the coupling element configured to receive power at a feeding point; a ground plane comprising a conductive material and facing at least a portion of the coupling element; and a dielectric which is between the coupling element and the ground plane and faces the coupling element and the ground plane, wherein the coupling element has an open end, wherein the coupling element has a rectangular portion where a current from the feeding point to the open end flows, wherein the coupling element has one or more through holes along an alignment direction of the coupling element and the ground plane, the one or more through holes being at a portion where the current flowing in the rectangular portion from the feeding point to the open end runs through a center of the rectangular portion when no through hole is provided, and wherein the dielectric has one or more holes which face the one through hole formed in the coupling element or one or more holes which face at least some of the plurality of through holes formed in the coupling element.