For this reason, a capacitor's loss tangent is sometimes stated as its " dissipation factor ", or the reciprocal of its " quality factor Q ", as follows
12.
Since the dielectric constant, dielectric loss tangent value, and volume resistivity are high, the corona resistance is not very good, and it is generally suitable for medium or low voltage and low frequency insulation materials.
13.
Furthermore, while " G " has virtually no effect at audio frequency, it can cause noticeable losses at high frequency with many of the dielectric materials used in cables due to a high loss tangent.
14.
Presence of alkaline metal ions has also detrimental effect to the loss tangent of the glass, and to its electrical resistance; glasses for electronics ( sealing, vacuum tubes, lamps . . . ) have to take this in account.
15.
The "'loss tangent "'is then defined as the ratio ( or angle in a complex plane ) of the lossy reaction to the electric field "'E "'in the curl equation to the lossless reaction:
16.
Thus, PCB traces have a small series resistance ( typically 0.1 ? / cm ) at DC . The high frequency component of the pulse is however attenuated by additional resistance due to the skin effect and dielectric loss tangent associated with the PCB material.
17.
At multigigabit / s data rates, link designers must consider reflections at impedance changes ( e . g . where traces change levels at vias ), noise induced by densely packed neighboring connections ( crosstalk ), and high-frequency attenuation caused by the skin effect in the metal trace and dielectric loss tangent.
18.
The substrates are characterized by several key parameters, chiefly thermomechanical ( glass transition temperature, tensile strength, shear strength, thermal expansion ), electrical ( dielectric constant, loss tangent, dielectric breakdown voltage, leakage current, tracking resistance . . . ), and others ( e . g . moisture absorption ).
19.
Copper has a small loss angle and a high quality factor, so a copper coin will ring for a long time, whereas zinc has a moderate loss tangent ( around 0.01 at a range of frequencies ), so a zinc coin will damp out much faster .-- talk ) 07 : 32, 25 June 2007 ( UTC)
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