700 MHz high-gain Yagi antenna specs

　　700 MHz high-gain Yagi antenna: unlocking a new realm of efficient communication

　　**

　　In the vast field of wireless communication, efficient transmission and accurate reception of signals have always been the core goals. With its unique and exquisite design and outstanding performance, the 700 MHz high-gain Yagi antenna stands out in many scenarios and becomes a powerful assistant for optimizing communication links and expanding signal coverage. Whether it is the stable transmission of radio and television signals or the efficient construction of professional communication networks, it shows incomparable advantages.

　　1. Exquisite design, casting excellent performance

　　(I) Unique vibrator structure

　　The Yagi antenna consists of an active vibrator, a passive reflector and multiple passive directors arranged in parallel. In the 700 MHz high-gain Yagi antenna, the active vibrator, as a key component of signal conversion, is usually in the form of a folded vibrator, connected to the feeder, converting the RF signal into an electromagnetic wave and transmitting it, or vice versa, receiving the electromagnetic wave and converting it into an electrical signal. Its length is precisely calculated and is generally close to half of the wavelength corresponding to the 700 MHz frequency band, ensuring efficient signal coupling in this frequency band.

　　The passive reflector is located behind the active vibrator and is slightly longer than the active vibrator, generally 50% - 55% of the wavelength. It is like a signal "reflector", reflecting the electromagnetic waves radiated backward by the active vibrator forward, superimposing them with the forward propagating signals, and enhancing the signal strength in the forward radiation direction. Multiple passive directors are distributed in front of the active vibrator, with decreasing lengths, usually 45% - 50% of the wavelength. The director generates an induced current and radiates again by sensing the electromagnetic waves radiated by the active vibrator. Its radiation signal is superimposed in phase with the active vibrator signal in a specific direction, further enhancing the radiation capability of the antenna in that direction, greatly improving the antenna's directivity and gain.

　　(II) Accurate spacing setting

　　The spacing between the vibrators has a significant impact on the antenna performance. In the 700 MHz high-gain Yagi antenna, the distance between the reflector and the active vibrator is about one-quarter wavelength. This distance can ensure that the electromagnetic waves reflected by the reflector and the electromagnetic waves directly radiated by the active vibrator are in phase with each other in a specific direction ahead, achieving maximum superposition enhancement. The spacing between the director and the active vibrator has also been carefully designed. Generally, starting from the first director close to the active vibrator, the spacing gradually decreases, and the common range is between 0.15 and 0.3 times the wavelength. Reasonable spacing setting enables the radiation signal generated by each director to be effectively superimposed in the target direction, avoiding mutual interference between signals, thereby improving the overall gain of the antenna.

　　(III) Selection of high-quality materials

　　In order to ensure that the antenna operates stably and efficiently in the 700 MHz frequency band, the selection of materials is crucial. The vibrator is usually made of high-conductivity aluminum alloy. This material not only has good conductivity and can effectively reduce signal transmission loss, but also has excellent corrosion resistance and wind resistance, and can adapt to various harsh outdoor environments. The antenna support structure uses high-strength fiberglass or carbon fiber materials, which are light and strong. They can not only firmly support the vibrator and ensure the stability of the antenna structure, but also will not cause obvious interference to the signal, ensuring that the antenna's performance remains consistent during long-term use.

　　II. Excellent performance, opening a new chapter in communication

　　(I) High gain, worry-free long-distance communication

　　High gain is a significant advantage of the 700 MHz high-gain Yagi antenna. By optimizing the vibrator structure and spacing, its gain can reach 10-15 dBi or even higher. Taking a 12-unit 700 MHz high-gain Yagi antenna as an example, the measured gain reaches 13.5 dBi. Compared with ordinary omnidirectional antennas, the signal strength is increased several times at the same transmission power. This means that in the transmission of radio and television signals, longer-distance coverage can be achieved, providing a clear and stable signal source for remote areas. In the field of professional communications, such as maritime communications and forest fire prevention communications, high gain characteristics can effectively overcome the attenuation of signals during long-distance transmission, ensure the smooth flow of communication links, and make information transmission not limited by distance.

　　(II) Strong directivity, precise signal focusing

　　The Yagi antenna itself has strong directivity, especially the 700 MHz high-gain Yagi antenna. Its radiation pattern shows obvious narrow beam characteristics. In the horizontal direction, the half-power beam width is usually between 30°-60°, and in the vertical direction, the half-power beam width is between 20°-40°. This strong directivity enables the antenna to concentrate signal energy in a specific direction, illuminating the target area accurately like a spotlight. In an environment with tall buildings in the city, the antenna direction can be adjusted to avoid obstacles, accurately cover specific blocks or buildings, reduce signal interference, and improve communication quality. In the field of radar detection, strong directivity helps to detect the target position and movement trajectory more accurately, providing reliable data support for meteorological monitoring, air traffic control, etc.

　　(III) Good anti-interference ability

　　In complex electromagnetic environments, the 700 MHz high-gain Yagi antenna exhibits excellent anti-interference ability. Its strong directivity makes the antenna have a natural suppression effect on interference signals from non-target directions. At the same time, by reasonably designing the resonant frequency and bandwidth of the antenna, it has good selectivity in the 700 MHz frequency band and can effectively filter out adjacent frequency interference signals. For example, in areas where the 5G communication band is adjacent to the 700 MHz band, the antenna can reduce the interference of 5G signals to 700 MHz communication through its own filtering characteristics, ensuring the purity and stability of the communication signal. In places with severe electromagnetic interference such as industrial plants, it can also ensure the normal operation of communication equipment without being affected by the complex electromagnetic noise around it.

　　III. Diversified applications, enabling development in various fields

　　(I) Broadcasting and television signal coverage

　　In the broadcasting and television industry, the 700 MHz high-gain Yagi antenna plays a key role. For terrestrial digital TV broadcasting, it can be used as a transmitting antenna to transmit TV signals to the target area in a directional manner, achieving high-quality signal coverage over a large area. Especially in areas with complex terrain such as mountainous areas where signals are easily blocked, its high gain and strong directivity can effectively penetrate obstacles such as mountains and trees, and deliver clear TV programs to residents in remote mountain villages. In the signal transmission of some county-level TV stations, after using 700 MHz high-gain Yagi antennas, the signal coverage radius has been expanded from the original 20 kilometers to 50 kilometers, greatly improving the service scope and influence of the TV stations. At the same time, in terms of radio and television signal reception, the antenna can also be used for TV signal reception in homes or communities, helping users obtain stronger and more stable signals, avoiding problems such as screen freezes and snow, and improving the viewing experience.

　　(II) Construction of professional communication network

　　In the field of professional communications, 700 MHz high-gain Yagi antennas are widely used in emergency communications, railway communications, power communications and other scenarios. In emergency communications, when natural disasters such as earthquakes and floods occur, communication base stations may be damaged. At this time, mobile emergency communication equipment equipped with 700 MHz high-gain Yagi antennas can be quickly deployed. Its high gain and long-distance transmission capabilities can quickly establish communication links with the outside world, provide real-time information transmission channels for rescue command, and ensure the smooth progress of rescue work. In railway communications, it is used for communication between trains and ground base stations. The strong directionality ensures that the train always maintains a stable communication connection with the base stations along the line during high-speed driving, and timely transmits key information such as train operation status and dispatching instructions to ensure the safety and efficiency of railway transportation. In power communications, it can be used for communication between power inspection drones and ground control centers, helping drones to accurately transmit inspection images and data in complex power line environments, and improve the maintenance efficiency of power facilities.

　　(III) Internet of Things Data Transmission

　　With the rapid development of Internet of Things technology, 700 MHz high-gain Yagi antennas have also emerged in the field of Internet of Things data transmission. In the construction of smart cities, it is used for data communication of Internet of Things devices such as smart transportation, environmental monitoring, and smart security. For example, in the intelligent transportation system, the traffic flow monitoring sensor installed on the roadside transmits the collected data such as vehicle flow and speed to the traffic management center quickly and accurately through the 700 MHz high-gain Yagi antenna, providing a basis for the intelligent control of traffic lights and alleviating urban congestion. In terms of environmental monitoring, the air quality monitoring stations and water quality monitoring stations distributed in various corners of the city use this antenna to transmit the monitoring data in real time, so that the environmental protection department can grasp the environmental dynamics in time and take corresponding measures. In the field of intelligent security, the surveillance cameras in communities, shopping malls and other places use this antenna to transmit video image data to the monitoring center to achieve remote real-time monitoring and ensure public safety. Its high gain and anti-interference ability ensure the stability and reliability of data transmission of IoT devices in complex environments, and provide strong support for the widespread application of IoT.

　　The 700 MHz high-gain Yagi antenna occupies an important position in the field of wireless communications with its exquisite design, excellent performance and wide application. It continues to promote the development of industries such as radio and television, professional communications, and the Internet of Things, bringing many conveniences to people's lives and social progress. As communication technology continues to evolve, the 700 MHz high-gain Yagi antenna will continue to innovate and upgrade, playing a more important role in the future communication world and ushering in a new era of more efficient and convenient communications.