Delay line with different receiver-resonator channels as an all mechanical front-end of a discrete matched filter for wake-up radios

We present the conceptual approach, theoretical simulations, and experimental results of a new radio frequency mechanical signal processor composed of a delay line with one transmitter and several receivers integrated with resonators. The system allows to set different delays and voltage gains for every receiver-resonator subsystem (channel), hence enabling processing of discrete chirp signals or complex frequency-shift keying (FSK) signals. We show results for a 2-channel system. The experimental results show voltage gain and different delay for each channel. This all-mechanical signal processor is ideal for improving signal-to-noise ratio in low-power wake-up radio receivers.