IQ demodulators are a category of electronic devices used for signal processing, rather than a specific brand. They are commonly employed in industries such as telecommunications, aerospace, and medical instrumentation. These devices are designed to extract in-phase (I) and quadrature (Q) components from modulated signals, enabling precise analysis and demodulation. Companies like Keysight Technologies (USA), Rohde & Schwarz (Germany), and National Instruments (USA) produce IQ demodulators as part of their test and measurement equipment portfolios. These products are essential for applications like radar systems, software-defined radio (SDR), and wireless communication testing.