868MHz 18dBi Yagi Antenna with RG58 Cable (L-20cm) + N (F) St. Connector

    

        LORA 18dBi Yagi Directional Antenna

 

 A Yagi antenna, also known as a Yagi-Uda antenna, is a directional antenna commonly used for communication purposes, particularly in radio and television broadcasting, as well as in wireless communication systems. It was invented by Hidetsugu Yagi and Shintaro Uda in 1926.

The Yagi antenna consists of several elements arranged in a specific configuration to achieve directionality and gain (the ability to focus or amplify signals in a particular direction). The basic elements of a Yagi antenna include:

    Driven Element: This is the active element of the antenna that is directly connected to the transmission line or feedline.

 

 

Reflectors: One or more reflector elements are placed behind the driven element. Reflectors help in directing the signal forward and enhancing the antenna's directivity.

    Directors: One or more director elements are positioned in front of the driven element. Directors focus the energy in the desired direction, increasing the antenna's gain.

The combination of a driven element, reflectors, and directors creates a phased array that enhances the antenna's directional characteristics. The length and spacing of these elements are carefully calculated based on the desired operating frequency.

Yagi antennas are widely used for point-to-point communication and are particularly suitable for situations where a focused signal beam is needed, such as for long-distance communication or receiving signals from a specific direction. They are commonly seen on rooftops for television reception, in ham radio setups, and in various wireless communication applications.

Key advantages of Yagi antennas include their high gain, directivity, and relatively simple design. However, they are limited in their ability to cover a broad range of frequencies, and adjustments to the design are needed for operation on different frequency bands.

It's important to note that Yagi antennas are just one type of directional antenna design, and there are other options like log-periodic antennas and parabolic reflectors that are also used for similar purposes.

 

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