Antenna Space Loss/Isolation Calculator The Antenna Space Loss/Isolation Calculator provides a quick method to determine isolation losses between two antennas. Antenna positioning configurations can be simple or very complex at wireless communication sites. A brief overview of antenna configurations and space isolation is described below. Vertical antenna space isolation is simple and there are charts available from antenna manufacturers which provide the isolation values. These isolation values are based on frequency band and antenna separation distance. The charts assume the antennas are mounted directly above and below each other (collinear) and the antenna gain has no effect due to this collinear arrangement. The distance between the antennas is measured from center line-to-center line. Horizontal antenna space isolation is also simple and there are charts available from antenna manufacturers for determining these isolation values. These values are also based on frequency band and antenna separation distance. The charts basically reflect free space loss and it is a simple matter to determine the amount of space isolation. Both antenna configurations consist of antennas that are neither vertically separated nor horizontally separated. The separation spacing is somewhere in between. You cannot use vertical isolation values or horizontal isolation values by themselves. You must measure or estimate the isolation value that lies somewhere in between. The figure shown here depicts a complex antenna configuration where the antenna configuration is neither vertical or horizontal. It is a combination of both. The best procedure to determine the isolation is to use measured data. However, measured data is rarely available so there must be some way of estimating the isolation between the antennas. One method for determining an approximate isolation value for this type of configuration is as follows: 1. De te rmin e the Ve rt ic al is ol at ion (V). 2. De te rmin e the Hori zo ntal isolation (H). 3. Use the fol lowin g f ormula to deter mine the net is ol ati on:
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