Electronic device with capacitively fed display antenna

Abstract

An electronic device may be provided with sidewalls, a rear wall, and a display mounted to the sidewalls opposite the rear wall. The device may include an antenna integrated into the display. The antenna may include a resonating arm formed from a first conductive layer in the display. The first conductive layer may be layered onto a dielectric layer of the display. The antenna may be fed using a feed patch layered onto the dielectric layer. The feed patch may indirectly feed the first conductive layer via a first capacitive coupling across the dielectric layer. The antenna may have a return path that includes a second conductive layer on the dielectric layer. The second conductive layer may convey radio-frequency current between the first conductive layer and the rear wall via a second capacitive coupling across the dielectric layer.