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question abou SIW Radiation Loss

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tork

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View attachment Accurate Modeling, Wave Mechanisms, and Design.pdfHi everyone

I have a problem with SIW! I see a paradox in radiation loss when we increase the frequency.

it physically seems that when f increa
ses the gap between cylinders increases for the propagating wave relatively. So the radiation loss should increase. However, I see some papers says the opposite.
Also, in a paper attached here, one figure suggests that radiation loss increase with frequency(fig 6), while fig 12 shows the opposite!

Thank you
 

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