Hello Farha,
I understand you are trying to figure out why your program is taking more time to execute when the frequency is increased from 2.5Ghz to 18Ghz. The reason why your program is taking such a long time to generate the phase plots for 18 GHz frequency could be due to complexity of the circular array you are designing, the number of antenna elements, and the computational resources available on your system.
The wavelength gets narrower at higher frequencies, thus your simulation might need to represent the antenna elements more accurately. This could increase the number of calculations needed to produce the phase graphs, lengthening the computation time.
Additionally, to effectively record and process signals at higher frequencies, larger sample rates could be needed, which could slow down your simulation even more.
If you want to boost the performance of your programme, you might think about employing more effective algorithms that are better suited for high-frequency simulations. You might also use parallel processing approaches.
