The unit of frequency is the hertz (Hz). 1 Hz is one wave per second. It is common for kilohertz (kHz), megahertz (MHz) and gigahertz (GHz) to be used when waves have very high frequencies.
Researchers at the University of Glasgow in the UK have developed the world’s first 60 Giga Hertz (GHz) millimeter-wave (mmWave) band antenna to facilitate ultrafast communication using 6G networks.