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Comparison of the dielectric constant and dissipation factors of non‐woven aramid/FR4 and glass/FR4 laminates

Subhotosh Khan (Du Pont Advanced Fibers Systems, Richmond, Virginia, USA)

Circuit World

ISSN: 0305-6120

Publication date: 1 June 2000

Abstract

Permittivity and dissipation factor (Dk and Df) are effects of polarization of different components of the dielectric substrate material when subjected to an electrical field. A database of these important design parameters for PWBs has been developed for Thermount RT. Effects of variations in the level of moisture (bone‐dry to completely saturated at various relative humidity levels), testing temperature (room temperature to 120uC) and testing frequencies (1MHz to 1.5GHz) on Dk and Df are reported. As the frequency of test is increased from 1MHz to 1.5GHz, the effect of moisture on the properties is reduced. Comparison with conventional glass/FR4 laminate properties shows the distinct advantage of Thermount. It is increasingly used in high frequency cellular telephone, satellite, and wireless applications which require HDI PWBs to achieve the highest packaging density at the lowest cost and weight.

Keywords

Citation

Khan, S. (2000), "Comparison of the dielectric constant and dissipation factors of non‐woven aramid/FR4 and glass/FR4 laminates", Circuit World, Vol. 26 No. 2, pp. 33-37. https://doi.org/10.1108/03056120010310909

Publisher

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MCB UP Ltd

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