DAB uses a wide-bandwidth broadcast technology and typically spectra have been allocated for it in Band III (174–240 MHz) and L band (1.452–1.492 GHz), although the scheme allows for operation between 30 and 300 MHz. DAB historically had a number of country-specific transmission modes (I, II, III and IV).
Traditionally, fiber providers used the C-band, which runs from approximately 1530nm to 1565nm. L-band, or long band, is a wavelength band immediately adjacent to the C-band that has been used for a decade to expand capacity of terrestrial networks. It is now being evaluated for use by submarine network providers.
A single S-band boom antenna on each satellite (deployed after launch by a pyrotechnic device) enables the satellite to communicate with Earth. It allows the satellites to communicate with Earth via radio systems in the microwave S-band spectrum.
V band
| Frequency range | 40 – 75 GHz |
|---|
| Wavelength range | 7.5 – 4 mm |
| Related bands | L / M (NATO) EHF (ITU) |
5G Ultra Wideband, Verizon's millimeter wavelength (mmWave)-based 5G, operates at frequencies of about 28 GHz and 39GHz. This is considerably higher than 4G networks, which use about 700 MHz-2500 MHz frequency to transfer information.
P-band The radar frequency band between 225 and 390 MHz. It is commonly used in remote sensing because of its good vegetation penetration.
Frequency Bands
| Letter Designation | Frequency Range | Wavelength Range |
|---|
| S band | 2 to 4 GHz | 7.5 cm to 15 cm |
| C band | 4 to 8 GHz | 3.75 cm to 7.5 cm |
| X band | 8 to 12 GHz | 25 cm to 37.5 cm |
| Ku band | 12 to 18 GHz | 16.7 mm to 25 mm |
relatively high frequencies are used to communicate with geostationary satellites. relatively low frequencies are used to communicate with low orbit satellites.
The most restrictive limits on whole-body exposure are in the frequency range of 30-300 MHz where the human body absorbs RF energy most efficiently when the whole body is exposed.
Extremely high frequency (EHF) is the highest microwave frequency band. EHF runs the range of frequencies from 30 to 300 gigahertz, above which electromagnetic radiation is considered as far infrared light, also referred to as terahertz radiation.
Currently, the entire 900 MHz band is designated for narrowband private land mobile radio communications and it has been primarily used for two-way dispatch radio communications by land transportation, utility, manufacturing, and petrochemical companies.
These waves are therefore considered the ideal wavelength for navigation. The two main frequency bands used for navigation are the 3000MHz S-bands and the 9000MHz X-bands.
WiFi frequency bands are frequency ranges within the wireless spectrum that are designated to carry WiFi: 2.4 GHz and 5 GHz. This article by TechTarget dives a bit deeper regarding what frequency bands are.
A SART will only respond to a 9 GHz X-band (3 cm wavelength) radar. It will not be seen on S-band (10 cm) or other radar. Shipboard Global Maritime Distress Safety System (GMDSS) include one or more search and rescue locating devices.
AN/SPY-1 (Army Navy Joint Electronics Type Designation System / S - Water (surface ship), P - Radar, Y - Surveillance (target detecting and tracking) and Control (fire and/or air control), model number).
A radar detector detects radar; it is not a “police detector.” Police radar transmits radio waves on a specific frequency, and the three frequency bands currently in use (in North America) are X-band, K-band, and Ka-band.
In addition to radar, the X-Band is also used for satellite and terrestrial communications. The frequency range from 8.175 to 8.215 GHz is usually used by meteorological satellites for monitoring weather conditions.
Radars usually operate at radio frequencies (RF) between 300 MHz and 15 GHz. They generate EMFs that are called RF fields. RF fields within this part of the electromagnetic spectrum are known to interact differently with human body.
between 3.4 GHz and 4.2 GHz
Most of the two million satellite dish users in the United States still used C-band.
Cellular 5G is completely different from WiFi 5G. Most cellular “5G frequencies” (higher frequencies) cannot even penetrate a piece of glass. 95% of cellular 5G frequencies are up to 100x worse at penetrating walls, glass, and buildings.
Verizon Communications (ticker: VZ) has the U.S. wireless industry's largest portfolio of high-frequency spectrum licenses, referred to as mmWave, but it lags behind competitors in mid-band. It was the biggest buyer in the CBRS auction, spending $1.9 billion on licenses mainly in densely populated areas.
The C-Band Alliance (CBA), which is comprised of the satellite operators Intelsat and SES that use the bulk of the C-band spectrum in the U.S., submitted a filing (PDF) to the FCC on Monday that cited two economic firms estimating the value of the 280 MHz of C-band spectrum at $43 billion to $77 billion.
The C-band has been described as "Goldilocks spectrum" for 5G because it can support blazing-fast transmissions as well as relatively broad geographic coverage.
5G low-band spectrum offers blanket coverageLow-band spectrum is any spectrum that is lower than 1 GHz on the spectrum chart. Early wireless networks, often referred to as analog cellular, were deployed in low-band 800 MHz spectrum.
The C-band (3300-4200 and 4400-5000 MHz) is emerging as the primary frequency band for the introduction of 5G by 2020, providing an optimal balance between coverage and capacity for cost efficient implementation.
