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circular waveguide mode suppression

circular waveguide mode suppression

circular waveguide mode suppression


I have a circular waveguide which can propagate both TE11 and TM01 modes due to its diameter. I would like to be able to suppress the TM01. Are there any easy classical ways of doing this? I cannot make the waveguide any smaller by the way...


RE: circular waveguide mode suppression

You really can not beat the old MIT rad lab series when it comes to moding filters, best check there.

Brute force mode filters short out the E-field, orthoganal to the desired mode E-field. others can use lossy materal parallel.

My initial guess, I have none of the reference materials at hand, But TM01 has a circular E-field, bessel functioned.

Insert a printed circuit, low ER, with thin printed copper circles, that correspond to the peak of J01 function.

If neccessary, l/4 matching can be incorporated to lower the TE insertion loss.

RE: circular waveguide mode suppression

Thanks GOTWW for the insight

However, the mode I have (which I'm pretty sure is TM01) has a radial e-field pattern, not circular.

I'll try & track down the MIT radiation labs titles again...


RE: circular waveguide mode suppression

You are right, sorry. This complicates matters quite a bit.

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