There are several different types of RF (Radio Frequency) antennas, each with its own characteristics and typical operating frequencies.
One common type is the dipole antenna, which is simple and widely used. It operates effectively in a broad range of frequencies, from a few MHz (megahertz) up to several GHz (gigahertz).
The Yagi-Uda antenna is another well-known type, often used for directional communication. It typically operates in frequencies ranging from VHF (Very High Frequency) to UHF (Ultra High Frequency), such as in the range of 100 MHz to 1 GHz.
Patch antennas are popular in wireless devices and operate at frequencies typically above 1 GHz, often in the microwave range.
Helical antennas are suitable for frequencies in the range of hundreds of MHz to several GHz and are used in various applications including satellite communication.
For example, in a Wi-Fi router, a patch antenna might be used to operate at frequencies around 2.4 GHz and 5 GHz. In a TV broadcast station, a Yagi-Uda antenna could be employed at frequencies in the VHF or UHF bands.
In conclusion, the choice of RF antenna depends on the specific application requirements and the frequency band of operation.