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feed a planar antenna with coax cable or discrte port in cst

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eleazar_777

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Hi everybody

I already design a planar antenna in cst(monopole) but I don't know how to feed the antenna with a coax cable because the ground is in the same plane as the antenna
i used a discrete port but I don't know if I am correct because
I had to change the impedance (10 ohms) to have the same result (simulate and measured) also can I use discrete complex ports in cst???
 

Jamesanton

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Re: feed a planar antenna with coax cable or discrte port in

see the picture and try to give the port in the bottom it may increase the electrical length of the antenna. and it is easy to feed the connector after the fabrication

U can use the discrete port. if u want to use waveguide port extend it to the rectangular part it will take it as a ground i am not sure about this but try this....
 

eleazar_777

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Re: feed a planar antenna with coax cable or discrte port in

HI James

thanks for your help but now I can't simulate in frequency
I have this error

"The length ratio between the shortest and the longest model edges is 1:1286. The shortest model edges can be highlighted via objects/solid healing tools/show shortest edges (it may be advantageous to model the metallization as infinitely thin sheets""
 

budder8818

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Re: feed a planar antenna with coax cable or discrte port in

If you are using frequency domain solver, it isn't good at handling very think sheets of material. So you need to model the sheet as infintily small
 

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