I am trying to design a rectangular waveguide (WR12) power divider/combiner to split/combine my signal and at the same time maintain a good isolation between the two fan-out legs.
In my simulation, I have tried a simple T junction with a septum in the middle, it works well as a fan-out and combiner but the isolation is poor.
Does anyone know any design tricks so I can achieve a good isolation while maintaining a good power dividing insertion loss? I can't use isolator structure in my design since my signal will go both way.
Thanks!
First, we need some numbers. Is it a 3dB power split you are after? (I presume so, from what you wrote). Second, what isolation do you need? 10dB, 15dB, 25dB?
I would recommend a Magic T coupler. This one perhaps?
https://www.pasternack.com/wr-12-waveguide-magic-tee-ug387-round-90-ghz-pewmt1001-p.aspx
Hi George,
Thank you very much for your answer. I kept searching some ideas but I forgot the magic T! As long as I terminate the E-arm, it would serve as a power divider with good isolation. Previously in my simulation, I had even tried to dig holes in between two adjacent waveguides to mimic a Wilkinson divider structure...
Yes, 3dB split is what I am trying to do. Our ideal isolation would be >25dB. And actually we will finally need to split the signal into four branches, I think this can be done by cascading two parallel magic T to another one.
Thank you again for the tip!
Best regards,
Wei
Hello,
A rectangular waveguide based in phase H-T power divider where the cavity is split in two with the whole circuit on one half and the metal cover on the other in order to guarantee the performance.
To advance this power divider as a power divider/combiner, a Wilkinson power divider is used to replace the T-junction. The power divider/combiner using the Wilkinson power divider with antisymmetric tapered probe is compact and has a broadband performance that shows equal power division, small reflection, and good isolation for all ports.
For more information read the paper given below.
Thanks,
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