Yagi Antenna (Yagi-UDA Antenna) is a high gain and strong directional antenna, which is widely used in wireless communication, broadcast, television reception and amateur radio. It was developed by the Japanese engineer H. Yagi and his colleague S. Uda in the early 20th century, hence the name. Here are some key features about Yagi's antenna:

Structural features:

Yagi antennas typically consist of multiple metal conductors, including a main radiator (also known as "emitter"), a reflector, and multiple guides (or "guiders").

The main radiator is the core part of the antenna and is responsible for transmitting and receiving signals. The reflector is located behind the main radiator and can enhance the radiation direction of the signal. The guide is located in the front to further increase the gain of the antenna.

Directionality and gain:

The Yagi antenna is highly directional and can concentrate the signal in a specific direction, making its gain in one direction significantly higher than that in other directions.

Typically, Yagi antennas have gains ranging from 6 to 18 dBi, depending on design and construction.

Frequency range:

Yagi antennas can be designed to operate in different frequency ranges, suitable for VHF, UHF, and other frequency bands. Its design can also be adjusted as needed to accommodate specific frequencies.

Field of Application:

Yagi antennas are widely used in television and radio signal reception, amateur radio, mobile communications, wireless networks such as Wi-Fi, and others.

In some cases, Yagi antennas are also used for astronomical observations and other scientific research.