Feeder selecting principle -> ensure that the power loss between the RRU RF port and the antenna port does not exceed 3 dB. If the power loss is greater than 3 dB, cell coverage is smaller, although cell functions are not affected.
Based on the above principle, the feeder length planning guidelines for a 1.8 GHz & 1.4 GHz project are as follows.
Frequency Band | Cabling Length Between the RRU and Antenna | Feeder |
1.8 GHz & 1.4 GHz | ≤ 20 m | 1/2" feeder |
≤ 45 m | 7/8" feeder | |
> 45 m | 5/4" feeder |
Feed selection for a different frequency can be applied based on the principle and the loss performance. Performance indicators of typical feeders can be found below:
