Circular apertures in rectangular waveguides

[jga]

I wish somebody could tell me if he knows articles or information about modeling circular apertures in a transverse metalic plate in a rectangular waveguide. It appears in the "Waveguide Handbook" by N. Marcuvitz, on page 238. Can anybody help me to find more information about this theme? Thanks a lot.

 

[marcusl]

R Collin, Field Theory of Guided Waves, 2nd ed. (1991) treats apertures in both transverse and long waveguide walls. He also gives an extensive list of references for further exploration.

 

[jga]

Thanks a lot for your reply. I will check the book as fast as I can. Other replies will be welcomed, too.

 

[cyclone24]

Hi,

When you are dealing with apertures and performing theoretical SE calculations, would you consider a near-field or a far-field condition? Or both?

i.e. do we have to take into account about the RF or EM wave proximity to the aperture, apart from the aperture dimensions??

Thanks.

 

[cyclone24]

anyone?

thanks

 

[marcusl]

The question doesn't completely make sense since there's no far field inside a waveguide. Near and far fields are antenna concepts. [BTW, what's an "SE calculation"?] The approach is to solve Maxwell's equations with correct boundary conditions, and you're never far from a boundary.

 

[cyclone24]

Thank you.

SE = shielding effectiveness calculation. I was curious to know if shielding effectiveness is calculated separately if the EM source is very close to the aperture or very far from it.