IP Mobilenet LLC B64450G25 Manuale Utente

 

 
 

637246.DOC  

Page 

15

 

 
Typical Antenna Configuration 
 
Base station antenna configurations may vary from site to site depending on the type of mounting 
structure, the presence of existing antennae, mounting structure loading limitations, etc.  The following 
information is provided as a guideline for a typical scenario. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Figure 10: Typical Antenna Configuration 

 
 
 
An optimal antenna mounting configuration is shown in the figure above.  The transmit antenna and 
receive antennae are located at different elevations.  This vertical separation provides the greatest 
degree of isolation between transmit and receive antennae.  The three (3) receive antennae are mounted 
at the same elevation and are oriented in a 120 degree triangular pattern.  A triangular orientation of the 
receive antennae provides optimal diversity performance in an omnidirectional pattern. 
 

 

The greater the separation between receive antennae, the greater the diversity gain; therefore, 
the distance between antennae should be made as great as is practical. 

 
 
In the event only two (2) receive antennae are used (i.e. a dual receiver diversity reception system), the 
receive antennae should be mounted in a broadside orientation with respect to the radio coverage area.   
 

 

To prevent the antenna’s radiation pattern from becoming distorted, the immediate area 
surrounding each antenna should be kept free from conductive objects (i.e. other antennae, guy 
wires, or the tower structure itself).  The amount of clear area required to prevent pattern distorion 
is equal to the antenna’s near-field exclusion.