特低频（ULF, Ultra Low Frequency）是指频带由300Hz到3000Hz的无线电波。通常于矿场内使用，也可以作勘探地质和地震用。

无线电波名
英文缩写
频率下限
频率上限
最大波长
最小波长

极低频
ELF
3 Hz
30 Hz
100000 km
10000 km

超低频
SLF
30 Hz
300 Hz
10000 km
1000 km

特低频
ULF
300 Hz
3 kHz
1000 km
100 km

甚低频
VLF
3 kHz
30 kHz
100 km
10 km

低频
LF
30 kHz
300 kHz
10 km
1 km

Ultra low frequency (ULF) is the ITU designation for the frequency range of electromagnetic waves between 300 hertz and 3 kilohertz. In magnetosphere science and seismology, alternative definitions are usually given, including ranges from 1 mHz to 100 Hz, 1 mHz to 1 Hz, 10 mHz to 10 Hz. Frequencies above 3 Hz in atmosphere science are usually assigned to the ELF range.