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Multiple independent projects discovered undocumented firmware features in ESP32 microcontrollers that unlock raw IQ baseband capture, effectively turning cheap Wi-Fi chips into software-defined radios covering 2.2–2.7 GHz and up to 80 MS/s. These include ESPARGOS, an ESP32-S3 plus FPGA streaming setup, and the C5VRX 5.8 GHz FPV receiver.
Radio-frequency convolutional neural networks (RF-CNNs) repurpose existing wireless communication hardware for efficient AI inference on edge devices, demonstrating deep CNN performance with significant energy savings.
Applied Electrodynamics introduces WaveSight, a device that uses radio frequencies to reveal internal structures behind opaque layers, aimed at construction, industrial inspection, and security applications.
A Rotman lens is a passive electronic component used for beamforming in radio frequency applications, enabling multiple antenna beams without phase shifters. It was invented by Walter Rotman and R.F. Turner in 1963.