Frequency band,中文译为“频段”,是指无线电通信中一段连续的频率范围。在电磁波谱上,不同的频率对应不同的无线电波长,而频段则用来划分和管理这些无线电信号的使用。 例如: 超高频(Ultra High Frequency, UHF)频段通常指300 MHz至3 GHz之间的频率。 高频(High Frequency, HF)频段覆盖了3 MHz至30 MHz。
Band name Frequency range Wavelength range Notes HF 3–30MHz 10–100m coastal radar systems,over-the-horizon radar(OTH) radars; 'high frequency' P < 300 MHz 1 m+ 'P' for 'previous', applied retrospectively to early radar systems VHF 30–330 MHz 0.9–6 m Very long range, ground penetr...
X8–12 GHz Missile guidance, marine radar, weather, medium-resolution mapping andground surveillance; in the USA the narrow range 2.5–3.75 cm 10.525 GHz ±25 MHzis used for airport radar. NamedX band because the frequency was a secret duringWW2. 1.67–2.5cm high-resolution fromGerman kurz, ...
Low frequency (LF) 5 30 to 300 kHz 1 to 10 km Medium frequency (MF) 6 300 kHz to 3 MHz 100 to 1,000 meters (m) High frequency (HF) Also known as shortwave radio or decameter band 7 3 to 30 MHz 10 to 100 m Very high frequency (VHF) 8 30 to 300 MHz 1 to 10 m Ultra ...
Band name Frequency range Wavelength range Notes HF3–30MHz10–100m coastalradarsystems,over-the-horizonradar (OTH)radars;'highfrequency' P<300MHz1m+ 'P'for'previous',appliedretrospectivelyto earlyradarsystems VHF30–330MHz0.9–6m Verylongrange,groundpenetrating;'veryhigh frequency' UHF300–1000MHz...
Radar frequency bands Band name Frequency range Wavelength range Notes HF 3–30 MHz 10–100 m coastal radar systems, over-the-horizon radar OTH radars; high frequency P 300?MHz 1 m+ P for previous, applied retrospectively to early radar systems VHF 30–330?MHz 0.9–6 m Very long range,...
Characteristics and protection criteria for radars operating in the radiolocation service in the frequency band 30-300 MHzdoi:ITU-R M.1802
Development and evaluation of a long-range 300-m leaky coaxial cable in the 2.4-GHz band for IEEE 802.11 b/g wireless network access H,Einaga K,et al.Development andevaluation of a long-range 300-m leaky coaxial cable in the2.4GHz Band for IEEE 802.11b/g wireless network ac-cess... ...
被引量: 30发表: 2004年 Ultralow Noise and High-Power VECSEL for High Dynamic Range and Broadband RF/Optical Links 170 dB/Hz over a wide frequency bandwidth, from 300 MHz to 40 GHz, except at the laser free spectral range (20.4 GHz). In the low-frequency range... G Baili,L Morvan,...
When working with measured vibrations, constant bandwidth and density spectra are typically obtained using FFT analysis, while one-third-octave band spectra are obtained by using either parallel filtering or a synthesis based on FFT analysis. All have evolved from the digital signal processing requireme...