U band explained

The U band is a range of frequencies contained in the microwave region of the electromagnetic spectrum. Common usage places this range between 40 and 60 GHz, but may vary depending on the source using the term.^{[1] [2]}

Notes and References

1. News: Millimeter Wave Propagation: Spectrum Management Implications. July 1997. Federal Communications Commission, Office Of Engineering And Technology, Bulletin Number 70. September 10, 2016.
2. Halfen . D. T. . Min . J. . Ziurys . L. M. . a New U-Band (40 - 60 GHz) Fourier Transform Microwave Spectrometer . 67th International Symposium on Molecular Spectroscopy . 1 June 2012 . 2012mss..confEFC01H . 26 March 2022.