Interface structures for wireless communication devices

An electronic device having first and second faces, comprising:

• a housing having a housing wall at the first face;
• a display mounted to the housing and disposed at the second face;
• an antenna resonating element configured to form a near-field wireless communication link with external equipment by conveying radio-frequency signals at a frequency greater than 10 GHz through the housing wall;
• and
• a dielectric matching layer interposed between the antenna resonating element and a first portion of the housing wall, wherein the first portion of the housing wall is surrounded by a second portion of the housing wall, the first portion of the housing wall has a thickness different than a thickness of the second portion of the housing wall, and the first portion of the housing wall comprises a recess at an interior surface of the housing wall.

An electronic device having first and second faces, comprising:

• a housing having a housing wall at the first face;
• a display mounted to the housing and disposed at the second face;
• an antenna resonating element configured to form a near-field wireless communication link with external equipment by conveying radio-frequency signals at a frequency greater than 10 GHz through the housing wall;
• and
• a dielectric matching layer interposed between the antenna resonating element and a first portion of the housing wall, wherein the first portion of the housing wall is surrounded by a second portion of the housing wall, the first portion of the housing wall differs from the second portion of the housing wall in at least one physical property, the housing wall has a ledge portion that partly defines a cavity overlapping the antenna resonating element, and the first portion of the housing wall overlaps the cavity.