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[SOLVED] understanding group wavelength in coax to waveguide transition simulation

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yefj

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Hello,We excite the coax input by some freequency in CST simulation.
i need to locate the coax at 0.25*lambda_g from waveguide wall.
so if mycoax input is at f=2.4G i have tried to input the waveguide dimention as shown bellow in matlab.
matlab gives me complex number ( 0.0000 - 0.1677i) in the result.
Where did i go wrong?

Code:
c=3*10^8;
f=2.4*10^9;
a=98.06*10^-3;

sqt=sqrt(1-pow2(c/(2*a*f)))
formula=(c/f)*(1/sqt)

Thanks.
1633085234483.png

1633084768302.png
 

FvM

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pow2() does not what you apparently expect.
Try sqt=sqrt(1-(c/(2*a*f))^2)
 
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