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Attenuation at High Frequency

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balamani

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Hi

Please find the attached file (image). How does SIW show less attenuation at high frequency whereas Microstrip shows high attenuation @ high frequency? Which property / parameter plays role here?

plz clarify slide.jpg
 

It's normal.Waveguides have always less attenuation compare to Transmission Lines at very high frequencies.Therefor Waveguides have "lower cut-off frequency" and they don't have higher cut-off frequency due to their EM modes ( TE or TM)
 
Hi

Really thank You so much. Is there any relation between TEM Vs TE modes with respect to attenuation and frequency? Please explain me and/or share me a document to understand this.

Thanks
 

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