According to the formula:capacitance=dielectric constant*area/length, as device area increases, the capacitance will increase while the resistivity will decrease, then the frequency, which equals to 1/RC, will maintain the same value.
However, I changed the device area and then found that the frequencies were not the same for different case.
In the dropbox (https://www.dropbox.com/sh/ailvkwtm40h4kjs/AACddf4EwKZa0t8dwT8jP63_a?dl=0) are my simulation files, hope you can help me solve this problem.
Thank you very much.
Meng-Chin Lee 李孟津
Graduate Institute of Photonics and Optoelectronics, NTU