![]() One of the simplest parameters is the measurement of the signal strength. Depending on the specifications, various parameters of this signal are of importance. ![]() The basis is provided by the inventory by simply measuring the Wi-Fi signal. Depending on the area of application, coverage of Wi-Fi reception is, for example, desired or industrially mandatory. ![]() Wi-Fi reception depends on various factors. Walls and the architecture of a building are decisive factors when planning wireless networks and have a significant influence on the use of repeaters. The respective attenuation of the walls depends on various factors, such as the thickness and the material used. Put simply, the more walls there are between the transmitter and receiver, the weaker the incoming signal. Almost every wall attenuates radio signals and weakens them. One of the best known interferences in this area are simply walls. In the case of a radio signal, there is no bruising in this sense, but of course there are other resistances which can also reduce the power. In the case of a network cable, excessive pinching of the cable could increase the resistance and reduce the possible performance accordingly. 2.3 Which interferences can influence the Wi-Fi signal? Power over Line, also known as Powerline, refers to the use of the existing power grid to network end devices. Wi-Fi repeaters can be integrated for example via a network cable, an existing Wi-Fi or via Power over Line. Image by Revon.zhang under the Creative Commons Attribution-Share Alike 4.0 International licence The positioning should then be such that the defined areas are illuminated as well as possible. Before the router is installed, areas should be defined where Wi-Fi reception should be good and important. It is important to observe the radiation pattern of antennas. The position of the router and the connected antennas plays an important role in covering the signal strength in different rooms. 2.1 How is the Wi-Fi router best positioned? In the following chapter we will discuss the alignment of antennas and why devices are often equipped with more than one antenna. In the meantime, it has been fundamentally explained how an antenna works. The side mounted to the wall, in the diagram on the left, is strongly attenuated. This antenna has clear directional characteristics and, when installed correctly, radiates towards, for example, offices or the hall. 4: Radiation pattern, left: vertical alignment, right: horizontal alignmentįigure 4 shows the antenna diagram of a wall antenna. In Unternehmen mit großen Büros oder Hallen kann die Wahl einer anderen Antennenform große Vorteile mit sich bringen.įig. In companies with large offices or halls, the choice of a different antenna shape can bring great advantages. The housing of antennas is often designed more modern by the manufacturer, but the content remains an omnidirectional radiator. In domestic use, simple omnidirectional radiators are used in most cases. Due to the directivity, the gain of the radiation is higher, accordingly the range in this direction is also higher. In addition, unused areas are not or only very slightly irradiated. ![]() The antenna is designed to radiate field lines with good directivity. 1.3 Why do Wi-Fi antennas have different shapes?Īntennas are manufactured in different shapes in order to specifically influence the radiation pattern. The position of the exit and re-entry depends on the polarity of the antenna. In a rod antenna, the field lines exit one side of the antenna and re-enter the other end of the antenna, as shown in Figure 2. With vertical alignment, the antenna is viewed from the side. The wavelength can be calculated using the following formula:įig. The frequency is used to calculate the wavelength, which is decisive for the antenna length. Wi-Fi communicates among others in the frequency range of 2.4 GHz or 5 GHz, an FM radio in the frequency range of 87.6 MHz – 108 MHz. But why is this the case? Why do communication systems not use the same antenna? The reason is that different frequencies are assigned to different services and systems. For example, a Wi-Fi antenna is shorter than the antenna of a stationary radio. These vary in length depending on the system. In wireless communication systems, antennas are used for both the transmitter and the receiver. 1.1 Why are antennas of different lengths? Why are different radio systems equipped with differently constructed and long antennas? And what difference does it actually make if one or more antennas can be connected to a Wi-Fi router? Why is this extension necessary or is it perhaps just a question of better design? In the following chapter, the topic “antenna technology” is explained in more detail. ![]()
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