Typical requirements for 2T4R base stations: IMD3＜-150 dBc
Impact of frequency spacing: Intermodulation products are difficult to filter when Δf <10 MHz
Power correlation: 1 dB increase in input power raises third-order intermodulation by 3 dB
Multi-tone test signal generation technology
Digital predistortion compensation in real-time spectrum analysis
Aging trend prediction based on machine learning
Material selection: Specify non-magnetic stainless steel (μ_r=1.05)
Connection process: Prohibit magnetic coatings (e.g., nickel)
Maintenance specifications: Establish 25 N·m torque standard to prevent contact nonlinearity
