Safety Instructions

Table Of Contents

SYMEO LPR

LPR-1D

Product Documentation

Installation

Page 33 of 87

For installation of the Planar Antennas, it is important to keep the same

orientation of polarization for corresponding antennas (see Figure 17).

Figure 17: Backside of 23 dBi Planar Antenna

 Install the antenna fixture according to the accompanying operating instructions.

 Secure the antenna in the fixture.

 Connect the antenna to the antenna cable.

4.2.3 Fresnel zone

The area for radio transmission between two antennas is called Fresnel zone. The main part

of energy is concentrated in the first Fresnel zone.

This area has to be free of any obstacles otherwise the signal is

interrupted or attenuated.

The first Fresnel zone can be calculated as follows:

is the wave length and the distance between the two antennas. For a frequency of 5.8

GHz a wave length of approx. 0.05 m is calculated. The maximum radius between the two

antennas is indicated with . For different distances the maximum radius is given in Figure

18.

distance d

radius b

10 m

0.36 m

50 m

0.80 m

100 m

1.14 m

250 m

1. 80 m

500 m

2.54 m

1000 m

3.60 m

Antenna 1

Antenna 2

Fresnel zone