This manuscript presents an original concept for mm-wave non-dependent battery IoT devices. Firstly, both concept and components in focus for this work (reader front-end, RF-DC converter, and Backscatter modulator) are described. Then, the design and measurement of each component individually were performed. This work presents an up/down converter capable of converting signals with an IF frequency from 1 to 5 GHz to an RF frequency of 20 to 24 GHz and vice versa. The RF-DC Converter presents an efficiency above 40% in a range from 22 to 24 GHz, and the backscatter modulator can perform ASK and PSK modulations from 21 - 23 GHz with low power consumption. This shows that integrating all the components would be a viable solution for sovereign and battery-free systems.