In recent years, the rapidly increasing demands for higher data-rate communications and super resolution imaging have pushed the wireless system carrier frequencies toward higher spectrum regions, i.e. the sub-millimeter and terahertz (THz) bands. Despite the huge potentials, THz wireless technologies are hindered by the severe propagation losses associated with atmospheric absorption and the lack of high-power transmitting sources and cost-effective sensitive receivers. High-temperature superconducting (HTS) Josephson junction features low noise within a wide frequency range up to THz. Additionally, HTS material have considerably higher superconducting critical temperatures. Currently, miniature single-stage cryocoolers with base temperatures of around 40 K are commercially available, which means that more cost-effective and portable HTS-device-based systems are potentially feasible for wireless communications and sensing applications. In this report, research progress of HTS Josephson THz mixers in CSIRO/UTS will be presented, including system modelling theory, device fabrication, module and system development and demonstrations.