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network analyzer problem at low frequency

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kazim

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dear friends

i have made an antenna in HFSS that resonates at 600 MHz and works till 5 GHz. its works fine in simulation but when i fabricated it checked it on network analyzer its shows resonant frequency from 1.5 GHz.
i calibrated the NA from all aspects but still i cant find the problem.
i tested another antenna which i made earlier and it shows the same problem.

please help me i have very short time to present my work
 

You didn't tell anything about the antenna geometry and possble measures to prevent the cable from disturbing the antenna impedance. But if the EM simulation has been performed correctly, cable effects can be an explanation for the deviations. You can add the feeding cable in HFSS and check for the involved impedance changes.

A previous discussion of decoupling measures for a small band antenna:
https://www.edaboard.com/threads/129541/
 
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    kazim

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its is a microstip antenna which contain single feed having two parts-one meandered to get low frequency and the other circular shape to work at high frequency. dimension is around 100mm by 50mm. the result in HFSS is perfect. there are two type of ports to assign in HFSS-lumped port and wave port. i have assigned lumped port to the antenna. the results is perfect in HFSS but in network analyzer it shows that that the antenna start resonating at 1.5 GHz while it should start at 0.7
 

why do we face antenna measurement problem at low frequencies while at high frequencies there is nothing to consider other than simple calibration?
 

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