What is "guard band"

alt. 1 (context radio English) An unused part of the radio spectrum between bands, for the purpose of preventing interference. 2 The unrecorded space between tracks on magnetic tape or other media which prevents the signals on adjacent tracks from interfering with each other. 3 (context quality control English) The amount by which minimum product specifications are increased to ensure that, even with measurement uncertainty, the product will meet the minimum specifications with a specified level of confidence. 4 (context computer graphics English) A virtual area of the screen, bordering the real screen, to which any rendering is ignored, used to simplify clipping. n. 1 (context radio English) An unused part of the radio spectrum between bands, for the purpose of preventing interference. 2 The unrecorded space between tracks on magnetic tape or other media which prevents the signals on adjacent tracks from interfering with each other. 3 (context quality control English) The amount by which minimum product specifications are increased to ensure that, even with measurement uncertainty, the product will meet the minimum specifications with a specified level of confidence. 4 (context computer graphics English) A virtual area of the screen, bordering the real screen, to which any rendering is ignored, used to simplify clipping.

In radio, a guard band is an unused part of the radio spectrum between radio bands, for the purpose of preventing interference.

It is a narrow frequency range used to separate two wider frequency ranges to ensure that both can transmit simultaneously without interfering with each other. It is used in Frequency division multiplexing. It may be used in both wired or wireless communications, so that adjacent frequency bands on the same media can avoid interference.

The spectrum can also be licensed for low-power devices such as a private mobile phone network.