极低频 ELF (Extremely Low Frequency) 3-30Hz
　　超低频 SLF (Super Low Frequency) 30-300Hz
　　特低频 ULF (Ultra Low Frequency) 300-3000Hz
　　甚低频 VLF (Very Low Frequency) 3-30KHz
　　低频 LF ( Low Frequency) 30-300KHz
　　中频 MF (Medium Frequency) 300-3MHz
　　高频 HF (High Frequency) 3-30MHz
　　甚高频 VHF (Very High Frequency) 30-300MHz
　　特高频 UHF (Ultra High Frequency) 300-3000MHz
　　超高频 SHF (Super High Frequency) 3-30GHz
　　极高频 EHF (Extremely High Frequency) 30-300GHz