Spectrum and Some Types of Radio Waves

Radio Wave Spectrum and Types Radio waves are divided into several frequency bands based on their use.

Generally, the classifications include:

VLF (3–30 kHz) – maritime navigation, underwater communications.

LF (30–300 kHz),

MF (300 kHz–3 MHz) – AM radio, long-distance communications.

HF (3–30 MHz) – shortwave radio, long-distance/intercontinental communications.

VHF (30–300 MHz) – FM radio, two-way communications, some TV.

UHF (300 MHz–3 GHz) – TV, cellular, radar, and WiFi/Bluetooth.

How it Works and Propagation Radio waves are generated by an electronic oscillator that excites electrical charges in a conductor, which are then transmitted through an antenna.

These signals can travel directly (line-of-sight), bounce off the ionosphere (long-range HF waves), or reflect off the earth's surface and buildings (VHF/UHF for cellular communications and Wi-Fi).

Examples of Everyday Use Some examples of radio wave applications that we often encounter: AM/FM radio for music and news broadcasts. Television and satellite communications. Cellular networks, Wi-Fi, and Bluetooth on cell phones and laptops