## Tunable power divider

Started by 4 years ago7 replieslatest reply 3 years ago140 views

Hi,

Can anyone please suggest any tunable power divider available in market. I tried searching a lot, but found only research articles or patents. For a project related to simultaneous information and power transfer, I am looking for 2 way tunable power divider. By tunable, I mean the ratio of divided powers can be varied.

Regards

Sumit

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Hi Sumit,

What is the frequency range required?  Must this be a passive device, or can it be powered?

-- Neil

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Hi Neil,

Thanks much for reply. I tried much to search.

Upto 6 GHz should be OK for me. I would like to check both options, passive as well as active. If you can share the link, that will be great.

Regards

Sumit

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Sumit,

Sorry, but I don't have anything specific.  Since passive devices tend to be based on transformers, they tend to have a fixed loss.  Maybe you could just use a conventional two-way splitter, and place a variable attenuator in one leg.  Then one output leg would be -3 dB (plus some implementation loss), and the other leg would be lower than -3 dB (e.g. -4 dB to -10 dB).

If you want the total power to add to a constant amount, you could obtain that by properly adjusting variable attenuators placed on each leg.

-- Neil

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Ok, thanks, this one I understood. And what should be the implementation for an active divider. So that I make sure power_out_1 + power_out_2 = power_in; I mean if this is possible.

Regards

Sumit

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So, if P1 + P2 = Ptotal,

P2/Ptotal = 1 - P1/Ptotal

let P1 dB = 10log10(P1/Ptotal)

P2 dB = 10log10(P2/Ptotal)

then

P2 dB = 10log10(1 - 10^(P1dB/10))

e.g.  for P1 dB =-3.01 dB,

P2 dB = 10log10((1 - 10^(-3.01/10)) = -3.01 dB

Note P1 dB and P2 dB are always negative numbers.

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