IEEE uses letters to signify a range of frequencies.There are a number of organizations that assign these letter bands.
ka- The Ka-band as defined by IEEE is a frequency range from 27 to 40 GHz.
Q- The Q-Band is not officially recognized by IEEE or ITU, however, it is recognized by ISO as the frequency range from 36 to 46 GHz.
V- The V-band as defined by IEEE is a frequency range from 40 to 75 GHz
W- IEEE uses letters to signify a range of frequencies.W-band as defined by IEEE is a frequency range from 75 to 110 GHz.
credit- https://www.everythingrf.com/tech-resources/frequency-bands
