Ergonomic head-up display is enabled by reliable, low latency, radio frequency (RF) communication between smart glasses and smartphones. The form factor of antennas on head-worn frames is impacted by the proximity of the frame to the human head and by cross-body interference. In addition, the large bandwidth required on the glass-to-phone link entails the use of multiple antennas, limiting the space available to route signals. The presence of antennas also restricts the choice of material for the front frames. This disclosure describes a multi-element, front-frame structure for smart glasses that enables metallic front-frame materials that enable superior cosmetic, structural, and communication design options. The described structure reduces the space occupied by antennas and reduces the complexity of assembly of multiple discrete antennas. The propagation loss presented by the human head is nullified, enabling lower radiated power, lower power consumption, and smaller and/or lighter smart glasses.

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.