What Is The Difference Between These "Dielectric" Terms?by FredericChopin Tags: dielectric, difference, terms 

#1
Nov213, 08:25 PM

P: 34

Can someone please explain to me what the difference between these terms are?
1. Dielectric constant 2. Relative dielectric constant 3. Dielectric loss I came across them on this website: http://www.lsbu.ac.uk/water/microwave.html#pen Also, I don't really know what "δ" and "ε_{r}'" on the website are meant to represent. All and any help would be appreciated. Thank you. 



#2
Nov313, 02:23 AM

P: 34

Also, does anyone know the derivation to the equation:
$$\alpha = \frac{2 \pi }{ \lambda } \sqrt[]{ \frac{ \varepsilon_r \sqrt[]{1 + tan^{2} \delta }  1}{2} }$$ , which is also on the website? Thank you. 



#3
Nov413, 04:29 AM

HW Helper
P: 4,715

An ideal capacitor has no losses, a dielectric introduced between the plates just changes the total capacitance in proportion to the relative dielectric constant.
An nonideal dielectric also introduces a loss, which we represent by a resistance between the plates. So the real capacitor shows both capacitance and resistance; I think that leads to the angle you have there, δ. 


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