Hi all,

Can anyone tell me how to find out the power handling capability of Microwave Filters like interdigital bandpass filters?

Thanking you in advance.

 

That may depend on the frequency range. There are products available from 500MHz to 60 GHz.

Here is a link to an interesting site - http://www.ussc.com/~uarc/utah_atv/interdigital1.html.

The links the site contains may get you to another site where power can be factored in. None of the commercial sites gave power handling above 50 watts.

 

Hi beenthere,
Thanks for the reply and the website. The information in the website is quite useful.

Is there any IEEE paper or any journal on Microwave where power handling calculation is given for interdigital bandpass filters?

Is there any way to figure out the maximum power handling for interdigital bandpass filter through EM simulation or mathematical calculations using coupling coefficients?

 

By far and away the most useful paper on the subject of Microwave filters, including interdigital filters, is the widely cited Levy et al paper from IEEE Transactions on MW Theory and Techniques: http://ieeexplore.ieee.org/iel5/22/21335/00989962.pdf

Dave

 

Hi Dave,
Thanks for the paper.

Can anyone tell me how to find the maximum electric field intensity inside the filter using any 3D simulator??

 

Hi Dave,
Thanks for the paper.

Can anyone tell me how to find the maximum electric field intensity inside the filter using any 3D simulator??

How do you mean "inside the filter"? Do you mean physically inside the filter from an externally irradiated source?

Dave

 

Hi Dave,
Yes you are correct.
Take an example of Round rod interdigital bandpass filter. So if I connect the source to the filter, then what will be the maximum electric field intensity inside the cavity of the filter?

Is there any way to find out this using any 3D simulator?

 

Hi Dave,
Yes you are correct.
Take an example of Round rod interdigital bandpass filter. So if I connect the source to the filter, then what will be the maximum electric field intensity inside the cavity of the filter?

Is there any way to find out this using any 3D simulator?

Yes, quite easily. What sorts of frequencies are we looking at?

Dave

 

Hi Dave,
I have designed a filter at 2 GHz with 8% bandwidth.

Can you suggest any effective 3D simulator which I can use to find out maximum field intensity inside the cavity of filter and maximum power handling capability of the filter?

 

Hi Dave,
I have designed a filter at 2 GHz with 8% bandwidth.

Can you suggest any effective 3D simulator which I can use to find out maximum field intensity inside the cavity of filter and maximum power handling capability of the filter?

If you can get access to it, Ansoft HFSS is ideal for this type of HF problem, you will be able to model all field parameters (including your own mathematically derived functions), but specifically E/H intensity and power density distribution. For anything in the microwave frequency band this is what I use, and I use Maxwell 3D for anything in the RF range.

If you can model it I would be more than happy to take a look at your HFSS files and give you pointers on your model and solutions.

Dave