Electromagnetic interference (EMI) can degrade the performance and quality of RF circuits by inducing noise, distortion, or crosstalk on signals. To protect your RF circuits from EMI, you should use proper grounding and shielding methods, such as a single-point or star grounding scheme to connect all ground points to a common reference point, a multilayer or stripline substrate to embed your RF circuits between two ground planes, a metal or conductive enclosure to surround your RF circuits and block external EMI, a metal or conductive foil, tape, or mesh to cover your RF circuits and reflect internal EMI, and ferrite beads, chokes, or filters to suppress unwanted frequencies or harmonics. By following these techniques, you can make your RF circuits durable and reliable in harsh environments. It’s also important to test and verify your RF circuits under different environmental conditions to ensure their performance and quality. You can use simulation tools such as SPICE, ADS, or HFSS to model and analyze your RF circuits before fabrication. Additionally, you can use measurement instruments like oscilloscopes, spectrum analyzers, or network analyzers to evaluate and characterize your RF circuits after fabrication.