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Wavelength in vacuum (open air is almost the same)
Frequency is 2400 MHz
Final resulting wavelength in cm
Now for a PCB:
Dk (Effective Dielectic constant)=Er (Epsilon r=Relative permitivity) =Eeff (Epsilon effective, recognizing it is not a solid homogeneous material but a mixture of materials (resin and glass))
FR4 (PCB material) the Eeff is roughly 4.2
Guide wavelength in a PCB