Kerlink Wirnet iBTS Installation And Maintenance Manual page 151

Mounting the LoRa antenna just above or below the 4G antenna allows then to get 20 to
30dB isolation among the 50dB required.
The LoRa antenna can be an omnidirectional antenna. The worst case would be a 3dBi
antenna which has the "less directive" antenna pattern. An example is presented below:
We can see that the gain on the top of the antenna or below the antenna is about -15dBi to -
20dBi.
In case of sectorial antenna, the antenna gain above or below the antenna is also
significantly reduced to -10 to -15dB as shown below:
Classification
Internal Use
Confidential
Strict confidential
Figure 91 : Typical antenna gain pattern of a GSM BTS
Figure 92 : Typical gain of 3dBi omnidirectional antenna
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Wirnet iBTS
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Document title : Installation and
Maintenance Manual
Version : 2.0
Author : SNI
Date : 04/12/2018
Page 151 / 221