Antenna Installation
Tsunami
®
MultiPoint 10200 Series - Antenna Installation Guide
10
The antenna/devices located at different altitudes should be tilted at the correct angle to efficiently transmit/receive the
signals between the devices in the wireless network. The following
figure shows the antenna tilt and its importance when the
successive devices are located at different elevations above the ground.
Figure 1-2 Typical installation showing device/antenna tilt angle
The radiation patterns for a device with Horizontal polarized antenna in
Azimuthal
and
Elevation
planes are shown below
in
Figure 1-3
.
As per the regulatory domain, there are no limitations to the Azimuthal plane with respect to EIRP, but the
Elevation plane has a limit specific to EIRP above 30
degrees
as 21 dBm. To comply with this specification, Proxim products
have an option to control the transmit power based on the installation tilt angle and the radiation pattern of the antenna.
Figure 1-3 Antenna radiation patterns for Azimuthal and Horizontal Planes
The formula used for the calculation of
Transmit Power
is given below:
Transmit Power = EIRP - G
(30- 0)
- MIMO Gain
Where,
EIRP
- Equivalent Isotropically Radiated Power
G
(30- 0)
- Antenna gain at (30- 0) in the elevation plane
MIMO Gain
- Gain for Multi Input Multiple Output products
(2x2 MIMO Gain is 3 dB and 3X3 MIMO Gain is 4.8 dB)
•
The calculation of Transmit Power to comply with the EIRP limits for an antenna with a gain of 22 dB is explained below
for three different tilt angles:
•
Case 1
: 0 = 0
0
(No antenna tilt)
