Originally, California’s road signs were black with white lettering, but the state changed them after a federal rule was ...

Abstract: A retro-detection technique is introduced for simultaneous optical retroreflection, detection, and control in bidirectional sensor links. An architecture with three orthogonal photodiodes ...

The simulated retroreflection angles agree very well with the theoretical results, which validate the proposed design methodology. Published in: 2022 IEEE MTT-S International Microwave Workshop Series ...