Anechoic chamber power line filters are high-performance electromagnetic interference (EMI) suppression devices designed to eliminate both conducted and radiated noise across the 10 kHz to 40 GHz frequency range in RF testing environments. These filters meet EN 60939-1 standards for civilian use and MIL-STD-461G requirements for military applications, ensuring low-noise conditions during critical measurements such as antenna calibration, radar cross-section testing, and 5G millimeter-wave device characterization. Their patented coaxial shielding structure effectively mitigates ground plane resonance in multi-channel systems, while hermetically sealed stainless steel housings provide robust protection in humidity- or climate-controlled anechoic chambers.