Antenna Height; About The Fresnel Zone - Radwin WinLink 1000 User Manual

Antenna Height

Antenna Height
The recommended antenna height required for line of sight is calculated as the sum the Fres-
nel zone height and the boresight height. See
notation of Figure 21-1
height at distance d
300
----------------------------------- -
frequency

GHz
0.6 ------------------------------------------------------------ -
d +
1
For the most conservative setting, we take the mid-point between the antennas, setting
ExpectedRange
d = d = ---------------------------------------- -
1 2
----------------------------------- -

which gives
0.6 -------------------------------------------------------------------------------------------- -

simplifying to
0.52
The boresight clearance height is calculated as:
where
R = 6367.4425Km
Mean

About the Fresnel Zone

The Fresnel zone (pronounced "frA-nel", with a silent "s") is an elliptically shaped conical zone
of electromagnetic energy that propagates from the transmitting antenna to the receiving
antenna. It is always widest in the middle of the path between the two antennas.
WinLink 1000 User Manual
below, splitting ExpectedRange into d
from the left hand antenna, is given by
1
 
d d
1 2
d
2
2
300 ExpectedRange

---------------------------------------- -
frequency
GHz
ExpectedRange ExpectedRange
---------------------------------------- - + ---------------------------------------- -
2
ExpectedRange
.
---------------------------------------- -
frequency
GHz
.
Release 1.9.40
About the Fresnel Zone
1
2
2
2
ExpectedRange
2
R + ---------------------------------------- -
Mean
Chapter 21
below. Using the
+ d , the Fresnel zone
2
2
– R
2
Mean
21-3