EMI/RFI Filters, incorporating LC (inductor-capacitor) and RC (resistor-capacitor) networks, mitigate electromagnetic interference (EMI) and radio-frequency interference (RFI). These filters are designed to suppress unwanted electromagnetic noise, ensuring the proper functioning of sensitive electronic equipment. LC filters utilize inductors and capacitors to create resonant circuits, while RC filters employ resistors and capacitors to attenuate high-frequency interference. The market price of these filters vary based on factors such as brand, specifications, and quantity. Generally, basic LC or RC filter components can be relatively affordable, but specialized filters with advanced features or higher power handling capabilities may command higher prices. When buying these filters, pay attention to compatibility with your application's frequency and power, check specifications for insertion loss and attenuation, consider the filter's size and mounting options, ensure compliance with industry standards, and factor in the specific needs of your application.