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单词 Ultra high frequency
释义

Ultra high frequency

中文百科

特高频

特高频英语:Ultra High Frequency,简称UHF),是指频率由300MHz到3GHz的电磁波。波长由10cm到1m不等。

用于短途通信,可以用小而短的天线作收发,适合移动通信。

用途如下:

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

英语百科

Ultra high frequency 特高频

Another antenna type common at UHF; a reflective array TV antenna consisting of two high-bandwidth
Walkie talkies which operate on the 446 MHz PMR(Professional Mobile Radio) band.  The 67 cm wavelength permits them to use very short
Corner reflector UHF-TV antenna from 1950s

Ultra high frequency (UHF) is the ITU designation for radio frequencies in the range between 300 MHz and 3 GHz, also known as the decimetre band as the wavelengths range from one meter to one decimetre. Radio waves with frequencies above the UHF band fall into the SHF (super-high frequency) or microwave frequency range. Lower frequency signals fall into the VHF (very high frequency) or lower bands. UHF radio waves propagate mainly by line of sight; they are blocked by hills and large buildings although the transmission through building walls is high enough for indoor reception. They are used for television broadcasting, cell phones, satellite communication including GPS, personal radio services including Wi-Fi and Bluetooth, walkie-talkies, cordless phones, and numerous other applications.

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更新时间:2025/6/17 20:18:50