November 30,

2017

MAXIMUM DISTANCE 70-80GHZ

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TABLE OF FIGURES

FIGURE 1 99.9% 0.1M / 3.97” ANTENNA 2000 MHZ CHANNEL ................................... 4

FIGURE 2 99.9% 0.3M / 1 FT. ANTENNA 2000 MHZ CHANNEL ................................... 5

FIGURE 3 99.9% 0.6M / 2 FT. ANTENNA 2000 MHZ CHANNEL ................................... 5

FIGURE 4 99.99% 0.1M / 3.97” ANTENNA 2000 MHZ CHANNEL ................................. 6

FIGURE 5 99.99% 0.3M / 1 FT. ANTENNA 2000 MHZ CHANNEL ................................. 6

FIGURE 6 99.99% 0.6M / 2 FT. ANTENNA 2000 MHZ CHANNEL ................................. 7

FIGURE 7 99.9% 0.1M / 3.97” ANTENNA 250 MHZ CHANNEL ..................................... 7

FIGURE 8 99.9% 0.3M / 1 FT. ANTENNA 250 MHZ CHANNEL ..................................... 8

FIGURE 9 99.9% 0.6M / 2 FT. ANTENNA 250 MHZ CHANNEL ..................................... 8

FIGURE 10 99.99% 0.1M / 3.97” ANTENNA 250 MHZ CHANNEL .................................. 9

FIGURE 11 99.99% 0.3M / 1 FT. ANTENNA 250 MHZ CHANNEL .................................. 9

FIGURE 12 99.99% 0.6M / 2 FT. ANTENNA 250 MHZ CHANNEL ............................... 10

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70-80GHZ MAXIMUM DISTANCE

Calculating Maximum Distance of 70-80GHz Links

There has been significant growth in backhaul products operating in millimeter

frequency range recently. Being subject to rain attenuation, and because different

environments can have different characteristic attenuations, careful and precise

calculation of theoretical distances is critical.

The Aviat Networks data sheet, Maximum Distance 70-80GHz, graphically outlines the

relative distances for different combinations of link characteristics. The graphs represent

maximum distances in different cities around the world. The variables used are 0.1

m/3.97”, 0.3 m/1ft., 0.6 m/2 ft. antenna sizes; 250 MHz and 2000 MHz channel sizes;

and 99.9 percent and 99.99 percent availability requirements.

Note that the graphs show maximum theoretical distances, and that rain attenuation and

other environmental factors native to a city or locale, which can limit transmission range,

are not given any numerical environmental data. However, you can see the range of

differences for the significantly different environments of the major cities represented in

the charts.

Factors Used

Determining the maximum transmission distance for the 70-80GHz radios involves three

main variables: antenna size, channel size, and availability objective. With these three

parameters, you can calculate the maximum theoretical distance between antennas.

Features such as antenna placement, or atmospheric conditions such as rain,

temperature, or electromagnetic interference, are site-specific, and are not discussed or

quantified here or in the data sheet.

Antenna size: The larger your antenna, of course, the greater the transmission distance

your links can cover. However, the effective antenna range is also limited by channel

size and availability objective—these three factors are interdependent. The three sizes

used for comparison in the data sheet are 0.1 meters (3.97 inches), 0.3 meters (1 foot),

and 0.6 meters (2 feet).

Channel size: The smaller the channel size, the greater the maximum transmission

distance. Note that using 2000 MHz channels, 0.1 meter antenna, and an availability

objective of 99.9 percent limits the maximum distance to less than 7 kilometers. Using

the same antenna size and availability goal with 250 MHz channels increases the

maximum distance to around 9 kilometers.

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Availability objective: This is the level of availability you need to serve customer

expectations. The two levels commonly used are 99.9 percent and 99.99 percent. Note

that increasing the availability objective from 99.9 percent and 99.99 percent reduces

the maximum distance from 9 kilometers to just over 3 kilometers, given the 0.1 meter

antenna and 2000 MHz channels cited in the examples above.

Figure 1 99.9% 0.1m / 3.97” antenna 2000 MHz channel

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Figure 2 99.9% 0.3m / 1 ft. antenna 2000 MHz channel

Figure 3 99.9% 0.6m / 2 ft. antenna 2000 MHz channel

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Figure 4 99.99% 0.1m / 3.97” antenna 2000 MHz channel

Figure 5 99.99% 0.3m / 1 ft. antenna 2000 MHz channel

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Figure 6 99.99% 0.6m / 2 ft. antenna 2000 MHz channel

Figure 7 99.9% 0.1m / 3.97” antenna 250 MHz channel

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Figure 8 99.9% 0.3m / 1 ft. antenna 250 MHz channel

Figure 9 99.9% 0.6m / 2 ft. antenna 250 MHz channel

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Figure 10 99.99% 0.1m / 3.97” antenna 250 MHz channel

Figure 11 99.99% 0.3m / 1 ft. antenna 250 MHz channel

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Figure 12 99.99% 0.6m / 2 ft. antenna 250 MHz channel

Conclusion

Due to atmospheric absorption for millimeter waves, the frequency bands used by the

70-80GHz radios are more susceptible to rain attenuation than lower frequency bands.

In general, cities with heavier annual rainfall will have a shorter range than cities with

dryer climates. Because different environments can have different characteristic

attenuations, careful and precise calculation of theoretical distances is critical.

The purpose of the graphs in the data sheet is to plot the maximum distance millimeter

wave radios can achieve using different antenna combinations for different cities

worldwide. These plots provide a general idea of what distance range and capacity you

can expect based on representative cities with different rain rates.

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Data subject to change without notice.

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