About The Fresnel Zone - Radwin 5000 HPMP User Manual

Antenna Height
Availability
7 –
 
= 1 6 – 10
Cfactor
– arg
ExpectedFadeM in
----------------------------------------------------------- -
10

10
Antenna Height
The recommended antenna height required for line of sight is calculated as the sum the
Fresnel zone height and the boresight height. See About the Fresnel Zone below. Using the
notation of Figure 23‐1 below, splitting ExpectedRange into d
at distance d from the left hand antenna, is given by
1
300

---------------------------------- -
frequency
 GHz
0.6 ---------------------------------------------------------- -
+
d d
1 2
For the most conservative setting, we take the mid‐point between the antennas, setting
ExpectedRange
---------------------------------------- -
= =
d d
1 2
2
---------------------------------- -
frequency

0.6 ------------------------------------------------------------------------------------------- -
which gives
ExpectedRange
---------------------------------------- -
ExpectedRange

0.52 ---------------------------------------- -
simplifying to
The boresight clearance height is calculated as:
= 6367.4425Km
where R
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.
RADWIN 5000 HPMP User Manual
  
frequency
GHz

d d
1 2
300
ExpectedRange

---------------------------------------- -
2
GHz
ExpectedRange
---------------------------------------- -
+
2
.
frequency
GHz
.
Release 3.5.70
3

RequiredRange
KM
+ d , the Fresnel zone height
1 2
2
2
ExpectedRange
2
---------------------------------------- -
+
R
Mean
2
2
–
R
Mean
23‐3