The radar band refers to the frequency range in which the radar emits radio waves. The unit of measurement is Hertz (Hz). For the sake of confidentiality, letters were used to indicate a certain frequency range during World War II. Because it is a paragraph by paragraph, the Chinese translation is vividly translated into bands. The operating frequency range of most radars is 30 to 300,000 MHz, and the corresponding wavelength is 10 meters to 1 mm. Generally: 230-1000 MHz is called P band 1000-2000 MHz is called L-band 2000-4000 MHz is called S-band 4000~8000 MHz is called C band 8000-12500 MHz is called x-band 12.5~18 GHz called Ku band 18~26.5 GHz called K band 26.5~40 GHz, called Ka band The above-mentioned bands are still in use today. With the continuous advancement of technology, the band used by radar is also expanding, such as the terahertz band. Other Microwave band:
| L band | 1 to 2 GHz | Q band | 30 to 50 GHz |
| S band | 2 to 4 GHz | U band | 40 to 60 GHz |
| C band | 4 to 8 GHz | V band | 50 to 75 GHz |
| X band | 8 to 12 GHz | E band | 60 to 90 GHz |
| Ku band | 12 to 18 GHz | W band | 75 to 110 GHz |
| K band | 18 to 26.5 GHz | F band | 90 to 140 GHz |
| Ka band | 26.5 to 40 GHz | D band | 110 to 170 GHz |
