ferrite based power divider

[Electron3]

how to design a power divider with ferrite beads
at 10-100MHz frequency for max 1 watt power

 

[FvM]

Power dividers can use transmission line stubs or transformers. Do you see any literature references for implementation with "ferrite beads"?

 

[Electron3]

yes i am having litreture

 

[FvM]

The power divider is using LC networks and achieves impedance matching only for a small frequency range (if designed correctly), e.g. 28 MHz as claimed in the picture filename. It can never work over 1:10 frequency range.

For the possible design of a wide band power divider see the "3 dB hybrid transformer" in https://en.wikipedia.org/wiki/Power_dividers_and_directional_couplers#Hybrid_transformer

 

[ge]

FVM is right that the circuit in your pic will never do wideband, but I have seen similar using binocular (2-hole) ferrites and bifilar wire. I'm uncertain those will handle 1Watt.

 

[Electron3]

i tried similar design but didn't find even narrow band from prototype what should be the approach with ferrites

 

[FvM]

The "ferrite" is actually a RF inductor, I guess with a powder core. It's forming a 100:50 ohm matching circuit together with the capacitors.

 

[PG4I]

Your bandwidth of 10-100 MHz can never be reached with ferrites

 

[FvM]

Your bandwidth of 10-100 MHz can never be reached with ferrites

We should quickly clarify the terms. In the post #3 design, "ferrite based" actually means lumped LC, specifically based on single pi-filter. As said it can't be wideband.

A transformer based 10 - 100 MHz power divider would be well possible using ferrites, using the basic circuit linked in post #4. Another approach would be a multi-section lumped LC circuit, the lumped equivalent of a multi section transmission line Johnson power divider. It could possibly use ferrite core inductors.

 

[PG4I]

Okay, I was being premature. When building a power divider, I was thinking of using some kind of transformer with 2 secondary windings. Most ferrites have a limited bandwidth. When looking at the amidon datasheets for example, I would look at ferrite type materials. Material 43 runs from 1-50 MHz and material 61 goes from 10-200.

Specs at **broken link removed**

Regards,
Joop

 

[Electron3]

at 64 Mhz

multi-section lumped LC circuit, the lumped equivalent of a multi section transmission line Johnson power divider.
give me idea about this one

 

[FvM]

First a correction, I meant Wilkinson power divider. Johnson is a lossy resistive splitter.

Secondly search for "lumped multi section power divider".

A multi section transmission line power divider is e.g. described here https://www.microwaves101.com/encyclopedias/multistage-wilkinsons