IQ modulators are not a specific brand but a category of electronic components used in telecommunications and signal processing. They are typically produced by various companies specializing in RF and microwave technology, such as Analog Devices (USA), Mini-Circuits (USA), or Qorvo (USA). These devices are essential in industries like wireless communication, radar systems, and satellite technology, enabling the modulation of signals for efficient data transmission. Key products include I/Q (In-phase/Quadrature) modulators, which are critical for complex waveform generation in 5G, IoT, and defense applications.