Very high frequency (VHF) is used in various applications because of its ability to propagate relatively long distances and penetrate obstacles like buildings and foliage. One of the main uses of VHF is radio broadcasting and television transmission. VHF frequencies, ranging from 30 megahertz (MHz) to 300 MHz, are allocated for public and commercial broadcasting, providing radio programs and television channels to a widespread audience.
Additionally, VHF frequencies are used in air traffic control communications, maritime communications, and some military applications where reliable communication over moderate distances is essential.
Super Frequency (SHF), which ranges from 3 gigahertz (GHz) to 30 GHz, finds application in telecommunications, satellite communications and radar systems. The use of SHF frequencies allows for higher data transmission rates and more precise radar imaging capabilities compared to lower frequency bands.
Telecommunications networks, including cellular networks and wireless Internet services, often operate in SHF frequencies to meet increasing data demands and to support faster communication speeds over shorter distances.
Extremely high frequency (EHF), generally defined as frequencies above 30 Gigahertz (GHZ), provides several advantages in modern communications and technology applications. A significant advantage is the availability of wider bandwidths, enabling higher data transfer rates for wireless communication systems.
EHF frequencies are used in millimeter wave communications technologies, such as 5G networks, where they support ultra-fast data speeds and low latency. EHF is also used in satellite communications, radio astronomy, remote sensing, and some military and scientific applications where precise, high-resolution data transmission or imaging is required.
High frequencies, in various bands such as VHF, UHF, SHF and EHF, are chosen for specific applications based on their inherent properties.
The main reasons for using high frequencies include their ability to carry large amounts of data, their suitability for short-term communication with minimal interference, and their ability to support advanced technologies such as radar, satellite and high-speed wireless networks. High frequencies also enable efficient use of the electromagnetic spectrum, allowing the deployment of multiple communications channels and services without significant interference.
Extremely high frequency (EHF) applications, typically ranging from 30 GHz to 300 GHz, span several technology areas.
One of the prominent applications is in 5G wireless communications networks, where EHF frequencies enable faster data rates and reduced latency compared to lower frequency bands. EHF is also used in satellite communications to transmit high-definition video and data, in radar systems for precise imaging and detection, and in radio astronomy to study celestial objects and phenomena. Additionally, EHF frequencies are used in medical imaging, security screening technologies, and military communications for improved performance and reliability in various operational environments