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CST waveguide, dont work for >300mm design?

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nadabro

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Hi. I´m doing a work about Waveguide slotted 2.4ghz antenna but when i simulate the slotted waveguide (using waveguide port) using a slotted PEC bigger than 300mm, the results are very innacurate (S-dB/farfield/etc), but if the slotted have less than 300mm everything works well. the first issue that i know that something is wrong, is the information about the "number´s processor in use 0", if is <300mm always says 1.


since i dont have CST at home (only in my university)..i have very few time simulation available, if anyone can see the antenna feeding or mesh properties i´ll appreciate.

Thanks.
 

Hello,

I ran your problem (exactly as you uploaded it), with the waveguide being 475.5 mm long, and I got S11 of about -15.25 db @ 2.45 Ghz. Is that what it's supposed to be?

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jpsmith123
 

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    nadabro

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That´s very close of what i was expecting.. yesterday when i did the simulation (using that uploaded file), the S1,1 between 2ghz and 3ghz was always between -8.65 and -8.68, obviously something was wrong.
Maybe the CST installation in my university is corrupted..i dont know.

Can you upload the file with the results? i appreciate a lot, to explain at my university that something is wrong..

Thanks.
 

I'll send it to you by way of PM.

Regards,
jpsmith123
 

nadabro said:
Hi. I´m doing a work about Waveguide slotted 2.4ghz antenna but when i simulate the slotted waveguide (using waveguide port) using a slotted PEC bigger than 300mm, the results are very innacurate (S-dB/farfield/etc), but if the slotted have less than 300mm everything works well. the first issue that i know that something is wrong, is the information about the "number´s processor in use 0", if is <300mm always says 1.


since i dont have CST at home (only in my university)..i have very few time simulation available, if anyone can see the antenna feeding or mesh properties i´ll appreciate.

Thanks.
Click to expand...
If you're using CST2006-version, you need install the last Service Pack from CST company.
 

Use Agilent EMDS for such problems.
 

yes..with the latest Service Pack works just fine.

Thanks.
 

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