Reflective Parametric Frequency Selective Limiters with sub-dB Loss and $μ$Watts Power Thresholds

Abstract

This article describes the design methodology to achieve reflective diode-based parametric frequency selective limiters (pF SLs) with low power thresholds (P th ) and sub-dB insertion-loss values (IL s.s ) for driving power levels (Pin) lower than P th . In addition, we present the measured performance of a reflective pF SL designed through the discussed methodology and assembled on a FR-4 printed circuit board (PCB). Thanks to its optimally engineered dynamics, the built pF SL can operate around ∼2.1 GHz while exhibiting record-low P th (-3.4 dBm) and IL s.s (0.94 dB) values. Furthermore, while the pF SL can selectively attenuate undesired signals with power ranging from -3.4 dBm to 13 dBm, it provides a strong suppression level (IS > 12.0 dB) even when driven by much higher Pin 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), even of wireless radios designed for a low-power consumption and consequently characterized by a narrow dynamic range.