English
Dec 13 , 2024
In the world of amateur radio, the choice of antenna often determines the quality and distance of communication. Among the many types of antennas, the LoRa Yagi Antenna is the top choice for many amateur radio enthusiasts due to its outstanding gain and directivity. So, what exactly is the LoRa Yagi Antenna? What are its components? And why are there LoRa Yagi Antennas with different numbers of elements? This article will answer these questions one by one.
The LoRa Yagi Antenna, fully named "LoRa Yagi Antenna," was co-invented by Professor Hidetsugu Yagi and Dr. Shintaro Uda of Japan in 1926. The LoRa Yagi Antenna features a simple yet powerful design, typically used for communication in the VHF and UHF bands. Visually, the LoRa Yagi Antenna consists of a series of metal rods arranged not randomly but according to certain rules on a supporting rod. Each metal rod is called an "element," and these elements together form the main structure of the LoRa Yagi Antenna.
The driven element is the only part of the antenna directly connected to the transmitter or receiver, usually a half-wave dipole. It is responsible for receiving or radiating electromagnetic waves and is the core of the antenna.
The reflector element is usually located behind the driven element and is slightly longer than the driven element. Its role is to reflect signals radiated from the driven element, thereby enhancing the directionality of the signal.
Director elements are located in front of the driven element and are shorter than the driven element. There can be one or multiple directors, and their role is to guide electromagnetic waves to propagate in a specific direction, thus increasing the antenna's gain.
The collaboration of these elements allows the LoRa Yagi Antenna to have a stronger reception or transmission capability in a specific direction.
The LoRa Yagi Antenna primarily relies on the interference and superposition effects of electromagnetic waves. When the driven element receives a signal, it generates an electromagnetic field in the surrounding space. The reflector and director elements couple with the electromagnetic waves generated by the driven element, altering the propagation direction and intensity of the electromagnetic waves.
The reflector element enhances the suppression of the backward signal by reflecting part of the electromagnetic waves back towards the driven element, thus increasing the strength of the forward signal.
The director elements concentrate and amplify the signal through phase difference, resulting in the LoRa Yagi Antenna having exceptionally high gain in the forward specific direction.
In a nutshell, the LoRa Yagi Antenna can focus the signal energy in one direction, similar to a "spotlight," significantly enhancing the transmission distance and quality of the signal.
The LoRa Yagi Antenna , with its unique design and excellent performance, becomes an indispensable tool for amateur radio enthusiasts. Whether a novice or an experienced operator, understanding the LoRa Yagi Antenna's structure and working principle will lead to a better communication experience in practice.
