How can I get rid of the random peaks in my graph?

Yolanda Gonzalez

Hello, 

I recently simulated a coil antenna to measure its resonance frequency. When the simulation had finished, I graphed the reflection coefficient in POSTFEKO and this was the result:

The results were fine all except for the random peaks that shoot upward throughout the graph. I was wondering if there was any way you get rid of these peaks? Are there any "filters" I could apply to the graph to take the peaks away? Or do changes need to be made to my model?

I have provided a PPT of results of different simulations run with the same frequency (1 MHz-20 MHz), # of Frequencies (300), and Frequency Increments (63.545 kHz). The only difference between the simulations is the capacitance values that were set. 

If you need any more information to help with this problem, please let me know! I appreciate the help! 

 

Best, 

Yolanda Gonzalez 

Resonance Frequency with # of Frequencies = 300.pptx

Jaehoon

Hello Yolanda,

The impedance value at the input port is normally calculated by using the ratio between a voltage and a current.

We normally apply "Double precision" to run a simulation at low frequencies.

1) Can you run your simulation with "Double precision" under Solve/Run tab > Solver Settings > General?

Additionally, 

2) finer mesh tends to give better results.

3) Continuous frequency setting...

Regards,

Jaehoon