Reflective Parametric Frequency-Selective Limiters With Sub-dB Loss and μWatts Power Thresholds

This article describes the design methodology to achieve reflective diode-based parametric frequency-selective limiters (pFSLs) with low-power thresholds ( P_{\mathrm{ th}} ) and sub-dB insertion-loss values (IL s.s ) for driving power levels ( P_{\mathrm{ in}} ) lower than P_{\mathrm{ th}} . In addition, we present the measured performance of a reflective pFSL designed through the discussed methodology and assembled on an FR-4 printed circuit board (PCB). Due to its optimally engineered dynamics, the built pFSL can operate around ~2.1 GHz while exhibiting record-low P_{\mathrm{ th}} (−3.4 dBm) and IL s.s (0.94 dB) values. Furthermore, while the pFSL can selectively attenuate undesired signals with power ranging from −3.4 to 13 dBm, it provides a strong suppression level ( IS>12.0 dB) even when driven by much higher P_{\mathrm{ in}} values approaching 28 dBm. Such measured performance metrics demonstrate how the unique nonlinear dynamics of parametric-based FSLs can be leveraged through components and systems compatible with conventional chip-scale manufacturing processes in order to increase the resilience to electromagnetic interference (EMI) and even of wireless radios designed for low-power consumption and, consequently, characterized by a narrow dynamic range.