Is it correct that in a bi-directional 2:1 Combiner - In1, In2, Out - there is a:
1. 3dB loss from Out -> In1 and from Out -> In2
2. no loss from In1 -> Out and from In2 -> Out
i.e.
if:
- In1 transmits 4dBm
- In2 transmits 5dBm
- - Out will receive 9dBm
if:
- Out transmits 6dBm
- - In1 will receive 3dBm
- - In2 will receive 3dBm
i.e. typical inesrtion loss is 0.5dB (approximately), therefore it'd change to:
if:
- In1 transmits 4dBm
- In2 transmits 5dBm
- - Out will receive 8dBm
if:
- Out transmits 6dBm
- - In1 will receive 2.5dBm
- - In2 will receive 2.5dBm
I doubled the insertion loss as you can see, but i'm not sure if its correct.
RF combiner/splitters are simple yet interesting devices.
If you want to know more about them, have a look here at the MiniCircuits website. **broken link removed**
This link takes you ro the application notes, there are lots of them. Scroll down, and near the bottom of the list you will find a section for Power Splitters/Combiners.
There you will find an FAQ and a section Understanding Power Splitters.