A 2.3 GHz −10.8 dBm Threshold Parametric Frequency Selective Limiter with 1.7 dB Loss

We present the design and measured performance of a two-stage ~ 2.3 GHz diode-based parametric frequency selective limiter (pFSLs), built on a FR-4 printed-circuit-board (PCB) and showing record-low power threshold ( $P_{th}$ , equal to −10.8 dBm) and insertion-loss value (ILS.S, equal to 1.66 dB) for driving power levels (P in ) lower than P th . Thanks to its optimally engineered dynamics, the built pFSL can not only selectively attenuate undesired signals with power levels ranging from −10.8 dBm to 4 dBm, but it also provides a strong suppression level (IS> 19 dB) when driven by much higher P in values than P th , even approaching 28 dBm. The record performance demonstrated in this work proves, for the first time, that diode-based pFSLs are suitable to increase the resilience to electromagnetic interference (EMI) even of those wireless radios designed for low-power consumption and, consequently, characterized by a narrow dynamic range.