The SMIQ-1844H-DG+ is a passive wideband in phase/quadrature (I/Q) mixer die fabricated using GaAs HBT technology. The SMIQ-1844H-DG+ is usable as a single-sideband upconverter for transmit applications or an image rejection mixer for receiver applications. The SMIQ-1844H-DG+ is ideal for wideband frequency translation applications that require inherent rejection of image signals and spurious mixing products. The mixer covers a broad band with RF and LO frequency range of 18 to 43.5 GHz and an IF frequency range of DC to 7 GHz. As a passive mixer, the SMIQ-1844H-DG+ offers lower noise figure than active mixers enabling superior dynamic range for high performance applications. No DC bias is needed for operation.