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Hello, I have the theory from the books shown below where we can change the polarization of an incident wave.

suppose we have TEM wave  where E field is in X direction.

so if n1=1 (vacuum) and n2=sqrt(4) )=2 FR-4

phi=(1-2)*(2*pi*lambda*0.25)/lambda=pi/2

so by this logic after quarter wavelength in FR-4 ,linear polarized wave will   have circular polarization?

[URL unfurl="true"]https://eceweb1.rutgers.edu/~orfanidi/ewa/ch04.pdf[/URL]

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