Radio frequency subbands are subdivisions within larger radio frequency bands. These subbands are further defined by specific frequency ranges and are allocated for particular applications or services. Subdividing frequency bands into subbands allows for more efficient and organized use of the electromagnetic spectrum, minimizing interference between different technologies and services. Here are some examples of radio frequency subbands within commonly used bands:
High Frequency (HF) Band:
- International Broadcast Bands: Within the HF band, there are subbands allocated for international broadcasting. These subbands are divided by geographic regions and provide clear frequency allocations for broadcasting stations.
Very High Frequency (VHF) Band:
- FM Broadcast Band: Frequencies from 88 MHz to 108 MHz are allocated for FM radio broadcasting.
- Aviation Band: Frequencies around 108 MHz to 137 MHz are allocated for aviation communication, including air traffic control and aircraft communication.
- Public Safety Band: Frequencies around 150 MHz to 174 MHz are often used for public safety communication, such as police and fire departments.
Ultra High Frequency (UHF) Band:
- UHF Television Band: Frequencies are allocated for UHF television broadcasting, including both analog and digital television.
- UHF Radio Microphone Band: Frequencies from 470 MHz to 698 MHz are used for wireless microphones and other audio devices.
- Cellular Bands: Frequencies within the UHF band are used for cellular communication, including 4G and 5G networks.
Super High Frequency (SHF) Band:
- C Band: Frequencies around 4 GHz to 8 GHz are used for satellite communication, radar, and some microwave links.
- X Band: Frequencies around 8 GHz to 12 GHz are used for satellite communication, radar, and scientific research.
Extremely High Frequency (EHF) Band:
- Ka Band: Frequencies around 26.5 GHz to 40 GHz are used for satellite communication, high-capacity data links, and remote sensing.
These are just a few examples of the many subbands within various frequency bands. The allocation and usage of subbands are carefully regulated to prevent interference and ensure that different technologies and services can coexist harmoniously within the radio frequency spectrum.