The presentation will give an overview on the present status of the resonant-tunnelling diodes (RTDs) in the area of THz electronics. The contemporary status of RTD oscillators will be discussed, in particular: the level of the output power and operating frequencies of RTD oscillators; overview on the different types of RTD oscillators, their advantages and disadvantages; tunability and frequency stability of the RTD oscillators. Use of RTDs as THz detectors will be also discussed, in particular: operating principles, limitations, application examples. Further on, an overview on the application examples of RTDs will be given: RTDs oscillators in high-data-rate wireless transmission systems, imaging applications, spectroscopy, etc.
