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During link planning, such factors as distance, obstacles and , humidity, temperature, atmosphere pressure and the link margin should be taken into account. We . Radio waves in the 70.5-76 GHz frequency range encounter additional atmospheric attenuation beyond that which is expected in free space due to water absorption, including rain fade. The amount of additional atmospheric attenuation will vary, depending on your specific installation environment. So we strongly recommend to use the InfiPLANNER tool for link planning where the rain impact is taken into account.
InfiPLANNER
InfiPLANNER is a link planning tool, which allows to design networks using InfiNet Infinet Wireless devices for optimal deployment and cost effectiveness. It accounts for different scenarios based on geography, distance, antenna height, transmit power, device models and other factors. It outputs an installation report that defines the parameters to be used for configuration, alignment and operation. Use the installation report to compare the predicted performance with the actual link performance. InfiPLANNER is available at https://infiplanner.infinetwireless.com.
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Make sure that line of sight is provided when planning the antennas' device placement for a point-to-point link in order to achieve maximum range and performance between two antennasdevices. Perform a survey to identify all the obstructions (such as trees or buildings) in the path and to assess the risk of interference.
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Any obstacle in the propagation path is critical for 70 GHz frequency band, make sure the line of sight is 100% clear. |
Below is an incomplete list of possible obstructions along the signal propagation path:
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More detailed information about radio signal propagation is available at "Wireless Networking Fundamentals" online course. |
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Wireless device placement
General recommendations for antenna device installation:
- Try to keep the LOS clear of obstructionsKeep 100% clear line of sight between devices. In case of installations over vegetation and forest, make sure the direct LOS line of sight stays above the trees; in urban environments - above the tallest buildings along the radio path.
- The influence of trees can be variable, depending on the season (ice, dew, leaves). Keep in mind that, during spring and summer, leaves can absorb high levels of radio energy. Therefore, when installing during the cold season, over forests and trees without leaves, try to achieve a higher fade margin.
- Install antennas Install wireless devices as far as possible from other antennas radio devices (the recommended distance is at least 2 meters between the edges of the antennas).
- Reflecting surfaces should be considered (buildings with reflective windows, water surfaces or wet grounds). These can be useful in NLOS situations, if there is no direct clear path between the 2 antennas, so the radio signal needs to be reflected by a surface. However, reflections can also decrease the signal quality when encountered along a clear LOS link, because of fading caused by multipath propagation. When installing antennas over the water, tune the height bracket within a 1-3 meters range variation, because it can yield significant signal level variations due to multipath fading.
- Install devices from power lines with a voltage higher than 35 kV at a distance at least 100-150 meters.
- Make sure the devices are located outside the area of water streams and splashes formation, which can affect the enclosure for a long time.
- 70 GHz antenna has a very narrow beam, keep devices directed strictly to each other.
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