wilkinson splitter design

Dear all,

Has anyone designed a 1 to 3 unequal power splitter,
I have read the Microwave Engineering (David Pozar).
It says it is a little difficult to disign a more than 3 ways
power splitter.
Can anyone who has done it share the experience with me?

Thanks

There are many families of couplers/power splitters. These what you want are done with what are called "Un-even Rat Race" couplers most of times called "Hybrid Rings". They are mostly done in strip-line waveguides and coaxials.



I do not have a scanner but try to find this in your nearest library:

"Hybrig Circuits in microwaves" Proc. IRE trans. 1947
From W. Tyrell

"An analysis of a broadband coaxial Hybrid Ring" IRE Trans. Microwave Theory and techniq. MTT-6 1958
From: V. Albanese, P. Peyser

Oh by the way here is a list of couplers/splitters/dividers known to Microwave world and surprisely some are not in Marcuwitz Waveguide handbook.

I am adding them using their most popular names:

Hybrig Ring
Wilkinson Coupler
Multihole coupler
Riblet-Saad coupler
Moreno Cross-Guide coupler
Branch-Line coupler
Riblet short-slot coupler

this might help:
w*w.edaboard.com/viewtopic.php?t=89212&highlight=wilkinson

I desiged 3 way Wilkinson splitter fo X band. You can design Star or triangle circuit. You have to connect the resistor between any two junctions(3 at all) and with m. strip it is tricky. You might use only two resistors but then you loose isolation between ports.

D.J

Which software do you use to design to 3-way divider,
The <Microwave Engineering >says the difficult part is
to disign the crossover isolation resistor.
What is your opinion?

IE3d is good for power splitter simulation.

What is the freq. rage you need?
You can think on different ways how to layout the circuit in order to have thtree resistors. It is impossible to have them all at one junction so use an air bridge short enought to have min influence.
If the Isolation is not critical give up on one of the resistors.

What if you were to design a 4.8dB coupler and then cascade it with a wilkinson splitter? That should give you a 3way even split.

Actually just to correct you who actually ask about frequency range a lot.

Couplers/power splitters are in most of the cases passive so the frequency are in contrast with active circuit is quite a lot broadband.

What is important however in couplers/power splitters is (1)coupling which is ratio in decibel incident power over coupled power and (2)Directivity which is again in dB scale ratio of coupled power over the power in decoupled port.

When they ask what is isolation that is nothing but ratio of incident power of power in decoupled port(S) in dB.

Frequency is of a second importance. What is important is that manufacturers may say that in (example 2GHz) maximum coupling is 10dB. 3dB is bandwidth is lingua-franca used by us.

Couplers are passive structures inherently. So they are quite a lot broadband.

Frequency range is important but not so much important as is for active circuits.

Rember that.

---------------------------
What are ranges stefen wants?

Does anyone know how much a 2-way combiner/splitter combo device is. I have heard it was about 1,400 S but it is too much for such a device I think.

Depends on application. If you want something special (a special application) for building your own satellite why not let me charge your 2000S for a such one. I will plate it with gold on top and etc.

You can buy power couplers/splitters/dividers for even 10S in electronic stores those for TV's ones.

http://www.miteq.com/micro/powercomp/index.html

top-left in figure is the "rat race" I have mentioned before. We built couplers in in passive RF class lab last year. It costed university peanuts.

For 3 way microstrip wilkinson splitter in order to keep high isolations between any two ports, one has to connect the 3 resistors. It is impossible so you have to use such as air bridge, bonds etc. As frequency goes up the layout is more complicated and tricky.

By the way an easy eay but take more area as mensioned before , split it twice.

I have a question about Power Divider/Combiners again. Is there a 2 way Power Divider/Combiner supports DC - 1 Ghz frequency range and costs around 500 S or below. Insertion loss lower than 5 dB is acceptable and there is no other restrictions.

ertug:

DC to 18GHz (6dB insertion loss) USS 780?
http://we.home.agilent.com/USeng/nav...879247/pd.html

Anzac T-1000 Power Divider 10Hz-1000MHz
S 20US
I do not know what is insertion loss

http://www.torontosurplus.com/redire.../rfp/rfp90.htm

Hi stefen,

Where are u using this splitter? is it working as combiner? if not then you may design 3 way unequal splitter without those isolation resistor. But remember that it depends upon where it will be used. If output ports are terminated with matched impedance and it is used as a splitter then u may neglect those isolation resistors.

g86



:D :D

u have not defined the specs or your requirements!
they are necessary for chosing appropriate solution:
1. insertion loss (6db lossy or very low for power combiner)
2. bandwidth (narrow or wide)
3. frequency (HF,VHF,UHF, or microwave)

remember that power splitters can be lossy but power combiner have low loss.

BEST!

I like to design and implement 3db coupler in 950-2250Mhz.After some research I found it should be implemented with "hybrid ring" sugested by S. March , D. I. Kim andY. Naito.Now I need their 2 papers:

1- S. March. "A Wideband Stripline Hybrid Ring," IEEE Trans. MTT., Vol. 16, June 1968, p. 361.

2-D. I. Kim and Y. Naito, "Broad-Band Design of Improved Hybrid-ring 3-dB Directional Couplers," IEEE Trans. MTT., Vol. MTT-30, November 1982, pp. 2040-2046.

Thanx

can u tell me how u designed ur resistor part in IE3d. and i want to simulate wilkinson power splitter with capacitive loading so can you tell me how to design these capacitors

---------- Post added at 16:59 ---------- Previous post was at 15:25 ----------

hey which software you have used for simulation . can you mail me that file. and one thing more . i want o simulate wilkinson power splitter with capacitive loading so can you help me in that .