×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

circular waveguide mode suppression

circular waveguide mode suppression

circular waveguide mode suppression

(OP)
Hi

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...

thanks

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

(OP)
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...

thanks

RE: circular waveguide mode suppression

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

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close