Vulnerability of L-Band LNA to the Out-of-Band HPM

In this article, the radio frequency (RF) performance degradation induced by out-of-band high-power microwave (HPM) is studied by simulation and experiment. The latent threat of the X-band HPM to the L-band low-noise amplifier (LNA) is verified by experiments. Due to the nonlinearity of active devices, the gain decreases under HPM inference, the nonlinear response of the LNA is investigated from the physical model, and the injection experiment shows that both the duty ratio and peak power of the HPM significantly influence the LNA gain.