All we know that we can not use the probe for measuring the high-frequency signal (microwave signals). I still can not understand the reason. I have read that the reason because of the wavelength size of the microwave signals is comparable to the electronic components, but this does not make any sense to me as the wavelength of the 1GHz is about 20 cm which is already comparable to the size of the electronic components.
Could any of you please explain to me in more details why we can not use the probe for measuring the high-frequency signal.