Issue link: https://read.uberflip.com/i/1423190
LoRa Alliance ® Whitepaper Page 13 of 49 LoRaWAN ® Gateways Radio Coexistence Issues and Solutions Copyright ©2021 LoRa Alliance, Inc. All rights reserved. www.lora-alliance.org We can see that the gain on the top of the antenna or below the antenna is about - 10dB to -15dB compared with maximum gain. In this section, we are going to consider the 6dBi omnidirectional LoRa antenna and the following performance: • Max gain: 6dBi • Horizontally 90°: 0dB loss • Horizontally 180°: 0dB loss • Vertically 90°: 20dB loss • Vertically 270°: 20dB loss 3.2.3 LoRa/LTE ANTENNA ISOLATION CALCULATION Considering the LoRa antenna gain and LTE antenna gain, the correction factor for horizontal isolation is: Correction H [0 0 ] = (6dBi - 0dB) + (20dBi – 0dB) = +26dB Correction H [90 0 ] = (6dBi - 0dB) + (20dBi – 20dB) = +6dB Correction H [180 0 ] = (6dBi - 0dB) + (20dBi – 30dB) = -4dB Considering the LoRa antenna again and LTE antenna gain, the correction factor for vertical isolation is: Correction V [0 0 ] = (6dBi - 0dB) + (20dBi –0dB) = +26dB Correction V [90 0 ] = (6dBi - 20dB) + (20dBi –25dB) = -19dB Correction V [180 0 ] = (6dBi - 20dB) + (20dBi –25dB) = -19dB Now, considering free-space attenuation between antenna, the total isolation between antennas, depending on the separation distance, is: