Talking about beautifying the antenna to boost the quality wireless network coverage

I. Introduction

With the increasing use of mobile communication applications, people have put forward higher requirements for communication capacity and quality. In order to meet the market demand, mobile service operators have proposed concepts such as full coverage and seamless coverage, which has continuously increased the construction and investment of the network, resulting in a large increase in the number of wireless base stations and antennas, thus bringing the following problems.

1. The antennas at the top of the urban buildings are lined up, and the dense urban areas appear to be more chaotic, which seriously affects the visual environment. Contradictions with the construction of “ecological cities” and “green cities” proposed by various places. Figure 1.

2. Although the design of electromagnetic radiation in wireless network construction projects meets national standards, with the improvement of residents' awareness of green environmental protection, there is a strong resistance to electromagnetic radiation of antennas, which brings great difficulties for site selection and construction of wireless network sites. .

3, the construction of urbanization, the floor is getting higher and higher, the conventional plate antenna simply relies on increasing the mechanical downtilt to deal with the coverage, the performance is poor, can not meet the high quality network coverage requirements.

In response to the above problems, beautifying antennas came into being, providing application solutions for high-quality wireless network coverage construction.

Figure 1 Picture of a city site

2. Overview of “beautifying the antenna”

The so-called "beautification antenna" can also be called "camouflage antenna", that is, under the premise of satisfying the essential function of the antenna, the electrical performance of the antenna is optimized according to various means, and the external appearance is camouflaged and modified to shape the appearance. Fusion is the starting point for design. Thereby beautifying the urban visual environment, reducing the residents' resistance to the wireless electromagnetic environment, greatly facilitating the construction of the site and ensuring the quality of the wireless communication network.

Three beautification measures commonly used to beautify antennas:

1. Dress up the antenna. The surface of the conventional plate antenna is sprayed with the same color as the environment, or the artificial plant and the green leaf are used to wrap the antenna, and the far-sighted effect is landscaping. This method has low cost and short processing cycle.

2, add a cover to beautify the antenna. In order to cope with the diversified requirements of the owner's beautification method, a beautification cover is added in addition to the plate antenna, and the outer cover shape is flexibly designed. This method is simple to operate, and the beautification effect is better, but the electrical performance is slightly worse.

3. Integrated landscaping antenna. Directly design the antenna into a special shape, change the traditional appearance of the antenna, and even design the shape of the object that is common in the environment to achieve the purpose of beautification. This method has better beautification effect, convenient product selection, stable electrical performance, and mass production, but the development cycle is longer. The integrated design idea will become the industry trend in the later period.

3. Beautify the environmental contribution of the antenna

The urban population is highly dense, with a large amount of traffic and concentration. Take Humen Town, Dongguan City, a coastal city as an example. The registered population is 120,000, while the migrant population is 500,000, and it is relatively concentrated in some industrial parks. According to incomplete statistics, the local population density reaches 3,680 people per square kilometer or more. The traffic volume is extremely large. In order to cope with the communication coverage, the original cellular structure must be further split, and the number of corresponding base stations must be increased, thereby improving the frequency reuse efficiency and accessing more users. The result is that the distance between the station and the station is greatly reduced, and the site is dense; secondly, the arrangement of the antennas varies widely, thus forming a phenomenon that the base stations are spread all over the floor and the antennas of the large and small buildings can be seen everywhere. This has greatly affected the appearance of the city. In order to reduce the impact of the antenna on the environment, Dongguan Mobile adopted a series of landscaping products of Huishen Company, and modified some sites to design a new site, which not only beautified the urban environment, but also achieved good network coverage. . At present, the widespread application of landscaping antennas in various cities has achieved good social repercussions, and various forms of high imitation landscaping antennas have become a beautiful landscape in the city. For example, Figure 2 and Figure 3.

Figure 2 Humen Baisha Industrial Zone Station Figure 3 Humen Baisha Industrial Zone Station after beautification (exhaust pipe shape)

Four. Two-dimensional electric adjustment technology application

In life, the layout of the building floor is complex, and the actual environment varies. In order to meet the full coverage and seamless coverage, in practical engineering applications, the antenna can usually be adjusted horizontally and vertically downwardly. The conventional plate-shaped ESC antenna can only realize the continuous electronic adjustment of the vertical plane beam. The horizontal beam beam pointing adjustment is realized by the artificial machine alone. In the case of a high-rise building or a tower, the adjustment is greatly inconvenient, and the manual adjustment of the mechanical time-consuming and laborious, the adjustment precision Poor, beam pointing error directly leads to a decline in network coverage quality. In this regard, Huishun Company takes the lead in adopting two-dimensional electric adjustment technology in the beautification antenna. The horizontal and vertical adjustment structure is built in the antenna, and is controlled centrally by RCU handheld controller or remote network management, thereby facilitating remote precise adjustment. Coverage provides great convenience. The vertical and horizontal adjustment structure of Huispeed Company is shown in Figure 4 and Figure 5.

Figure 4 vertical adjustment structure

Figure 5 Horizontal adjustment structure

Five. Large downtilt technology application

As the pace of urban construction accelerates, more and more high-rise buildings add a modern touch to the city. However, base station antennas are often placed on the roof of the building. It is extremely difficult to select a suitable height site in a city with high-rise buildings. At the same time, it brings a series of problems to engineering construction, property coordination, antenna maintenance, etc., and becomes a network optimization construction. difficulty.

If the antenna is laid out on a higher floor, in order to satisfy the coverage, the antenna beam is usually tilted down. Currently, there are three implementations of the antenna beam downtilt in the industry: mechanical downtilt, preset electrical downtilt, and electrical downtilt adjustment. The large mechanical downtilt adjustment is easy to cause waveform distortion, and the beautification antenna is a reasonable control volume, and the mechanical downtilt adjustment function is not available. Therefore, the ESC downtilt adjustment with better performance is the second choice. In general, the antenna downtilt setting can be calculated by the following formula:

Consider the downtilt angle at the time of interference suppression: α=actan(H/R)+β/2

Where α is the downtilt angle of the antenna, H is the effective height of the antenna, and β is the vertical half power angle of the antenna. R is the main lobe coverage distance of the cell. As shown in Figure 6.

Figure 6 Schematic diagram of base station coverage

Take the GSM900M 15dBi 65° ESC antenna as an example. The height of the antenna is 80m, and the beam width of the vertical plane of the antenna is 14°. It can be known from the above formula that if the main lobe is to cover a distance of about 250m, the electric downtilt angle should reach 18°. This is similar to the antenna frame height of 35m and the downtilt angle of 8°.

At the same time, for the problem of the increase of the far side lobes at the time of the large downtilt, Huishen Company adopts the single-vibrator phase shift for precise design technology. At the same time, the genetic algorithm is used to perform multi-frequency sampling, which achieves the effect of sidelobe suppression and reduces cross-over interference. Through the large downtilt technology, the coverage effect is similar to that of the antenna position. After testing with the operator, the company's large downtilt angle ESC antenna can meet the application scenario of more than 98%, thus making the mobile communication network The quality of communication has improved.

Huisheng's current large downtilt antennas are mainly divided into the following categories:

Summary and outlook

Beautifying antennas have become an important means for mobile operators to coordinate and solve site construction with their better environmental adaptability and shape diversity characteristics, which has played an active role in promoting mobile operators to achieve high-quality wireless network coverage. At the same time, with the continuous improvement of the requirements of urbanization construction and the increasing awareness of “greening and environmental protection”, the application of beautifying antennas in mobile communication base stations will become an inevitable trend.

Looking into the future, beautify the antenna or license through cooperation with other fields, such as street lamp construction, billboard construction, park landscape construction, building roof decoration design, etc., through integrated solution design, integration of resources, optimization Configuration, reducing the cost of mobile operators and optimizing wireless network coverage. At that time, the beautification antenna is not only a part of the communication antenna, but also coexists as a city landscape and the surrounding environment.

Poster LED Display

Advantage
1. Utra Thin and Light weight, Cabinet weight only 19KG and 86mm thickness.
2. In direct sunlight, the outdoor LED Display can be high-definition and high-brightness, high refresh rate, high contrast
3. Can withstand high and low temperature, can be used in extremely harsh environment
4. Modular design, Front and Rear maintenance system available, Separate and exchangeable power and data unit can be easily removed for easy maintenance
5. Outdoor IP65 is waterproof, dustproof and corrosion proof, ensures smooth and reliable operation under variable and extreme weather conditions.

* Nova MSD 300 sending card and Nova mrv328 receiving card

* Cabinet size:640x1920mm

* Kinglight/Nationstar LED Lamp, Refresh rate:1920-3840hz

* High brightness up to 2000cd/sq.m, even in the sunlight conditions can see clear, but low power consumption to save the electric power cost.

* High debugging brightness and no damage to gray scale, achieving the debugging technology for nice image.

* Passed the TÃœV,FCC,ROHS,CE cetification.

Poster LED Display,Poster Led Display,Mirrior Led Display,Led Poster Display

Guangzhou Chengwen Photoelectric Technology co.,ltd , https://www.cwstagelight.com