RT/duroid® 5870-5880 Laminates
●The fine scale uniformity of glass microfibers in the PTFE matrix of the RT/duroid® high frequency laminates apparently ac-counts for a significant advantage in isotropy of dielectric constant compared with PTFE materials depending on a woven fabric for reinforcement.
●Anisotropy, the condition in which the dielectric constant varies in value depending on the direction of the electric field with respect to the axis of the material, can be expected to lead to extra fringing capacitance, most evident in resonator elements, in narrow lines and in edgewise couplers where it impairs directivity. Localized variation in anisotropy, especially characteristic of woven fabric reinforced composites, can lead to degradation of performance. This is particularly true at higher frequencies in situations where a narrow coupling gap or very narrow lines are used.
●To simplify circuit design computations, isotropy of the electrical properties of laminated materials for microstrip or stripline circuitry is usually assumed. The nominal dielectric constant value is obtained by test methods in which the electric field is pre dominantly in the Z (thickness) direction. Glass fiber reinforced PTFE laminates have fibers Iying in the XY plane that have a dielectric constant nearly 3 times higher than the polymer matrix. The composite will be isotropic with εr,x and εr,y nearly equal but both greater than εr,z.
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Please see the document for details |
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