Body-mountable device to provide radio-frequency wireless communication

A body-mountable device comprising:

• an antenna substantially circumscribing a region of the body-mountable device, the antenna composed of a conductive material and having a first distal end and a second distal end separated by an insulative slit structure extending between an interior surface and an opposing exterior surface of the antenna, the exterior surface of the antenna and the insulative slit structure together forming an exterior sidewall of the body-mountable device and the interior surface of the antenna and the insulative slit structure together circumscribing a region of the body-mountable device;
• a proximity-coupled feed structure disposed at the region and separated from the antenna by a gap;
• and
• a controller disposed at the region and coupled to the antenna via a first conductor and coupled to the proximity-coupled feed structure via a second conductor.

A smartwatch comprising:

• first and second watchbands;
• and
• a communication device having a watch form factor and coupled to the first and second watchbands, the communication device including:
• an antenna substantially circumscribing a region, the antenna having two distal ends separated by a non-conductive gap, the non-conductive gap defining a portion of a periphery of the region, and wherein the antenna and the non-conductive gap together form an exterior sidewall of the communication device;
• a controller disposed in the region, the controller configured to conduct wireless signaling via the antenna using a feed structure adjacent to the antenna;
• a display panel disposed in the region and coupled to the controller, the display panel configured to display a graphical user interface (GUI);
• and
• a button coupled to the controller and disposed at least partially in a first aperture extending between an interior surface and an opposing exterior surface of the antenna, the button configured to be manipulated by a user to facilitate navigation of the GUI.