# relative permittivity

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Related to relative permittivity: Relative permeability

n.

## relative permittivity

n
(General Physics) the ratio of the permittivity of a substance to that of free space. Symbol: εr Also called: dielectric constant
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Capacitance and relative permittivity values were measured using Hewlett Packard 4194A impedance analyzer (50 Ohms, Refurbished).
The next equation can be used to calculate the relative permittivity:
and the total electric field, where [[epsilon].sub.r] is the relative permittivity. The scattered electric field can be obtained [21] as follows:
In the second layer, the substrate properties for the 50-[micro]m PEN film substrate are introduced by assigning the loss tangent to 0.01 and the relative permittivity to 3.35.
where [bar.E], [bar.B], [bar.D], and [bar.H] are electromagnetic fields, and [[epsilon].sub.r] and [[mu].sub.r] are relative permittivity and permeability of the material, while [kappa] is the chirality parameter which describes electromagnetic coupling and c is speed of light in vacuum.
The relative permittivity of the Engineering Quartz is about 3.9-j0.0001 [18] in the C band, so the proposed method for measuring the permittivity under the condition that the composite sample [S.sub.6] as showed in Figure 4 with mass ratio 2 : 1 and thickness is 8.56 mm is of very high accuracy.
The relative permittivity of water, about 70-80, is much higher than that of most civil construction materials, which are generally less than 5 [21].
The medium of the the slits and the ring (white area) is assumed to be air whose relative permittivity [[epsilon].sub.d] is set to be 1.
It is external non-magnetic dielectric layer (an upper index "d"), characterized by the real relative permittivity [[epsilon].sup.d.sub.r] and the relative permeability [[mu].sup.d.sub.r] = 1.
Given the relative permittivity and loss tangent of the dielectric, the attenuation constant can he determined using
For the Rogers 4350 substrate, the relative permittivity [[epsilon].sub.r] is 3.45, the value of tangent for the loss angle is 0.004, and the thickness of the metal is 50 microns.
The sample consists of a layer of material with thickness [DELTA] and relative permittivity [[epsilon].sub.r] = 10 embedded and centered within a layer of relative permittivity [[epsilon].sub.r] = 2, as shown in Figure 1.

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