Topic
Dielectric loss
About: Dielectric loss is a research topic. Over the lifetime, 20296 publications have been published within this topic receiving 349254 citations.
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TL;DR: In this paper, the authors focus on achieving low dielectric loss while trying to enhance the intrinsic dielectrics of polymers, which can be divided into two categories: extrinsic and intrinsic.
116 citations
TL;DR: In this paper, a percolative film with conductive acetylene black introduced into β-polyvinylidene fluoride was prepared by dip-coating method, and the experimental results showed that the dielectric constant of polymer/conductor composite films can reach 56 and the Dielectric loss is below 0.15 when the black concentration is in the neighborhood of percolation threshold (fc).
Abstract: A percolative film with conductive acetylene black introduced into β-polyvinylidene fluoride was prepared by dip-coating method. Percolation theory was employed to explain the dielectric behavior of polymer/conductor composite films. Experimental results showed that the dielectric constant of polymer/conductor composite films can reach 56 and the dielectric loss is below 0.15 when acetylene black concentration is in the neighborhood of percolation threshold (fc). The experimental results are in good agreement with classic percolation power law, with fc≈1.3% and exponent q≈0.53. Such composite films have a potential to become capacitors and can be easily fabricated due to its flexibility.
116 citations
TL;DR: In this article, a vector network analyzer and a coplanar-wave-guide miniature wafer probe are used to measure the dielectric constant and loss tangent of a thin film dielectrical material up to 5 GHz.
Abstract: We have developed a novel technique for measuring the dielectric constant and loss tangent of a thin film dielectric material up to 5 GHz. The dielectric film needs to be deposited on a metal layer and capped with a metal electrode layer. The bottom metal layer does not have to be very conductive, as long as its sheet resistance is uniform and known. Only one step lithography on the top metal layer is required. No dc electrical contact to the bottom metal layer is necessary. The measurement is taken with a Vector Network Analyzer and a coplanar-wave-guide miniature wafer probe.
116 citations
TL;DR: In this article, a polyvinylidene fluoride-carbonyl iron powder (PVDF-CIP) composites with different carbonyl-iron powder loading were developed for electromagnetic interference shielding applications in the X band.
116 citations
TL;DR: In this article, the transverse propagation constants for even TE modes when the dielectric sandwich is unsymmetrical were calculated for a three layer dielectra and the resultant field distributions were used to derive a formula for the gain of a junction laser of the form \alpha = \frac{1} + P\alpha{3}/nR + f\alpha_{2}}{g}, where the α n's are the attenuation (or gain) constants associated with the various regions of the junction structure.
Abstract: For a three layer dielectric sandwich, the center dielectric region must have a dielectric constant higher than the outer regions and some finite thickness for a wave to be "bound" to the center region. We have calculated the transverse propagation constants for even TE modes when the dielectric sandwich is unsymmetrical. The resultant field distributions are used to derive a formula for the gain of a junction laser of the form \alpha = \frac{\alpha_{1} + P\alpha_{3}/nR + f\alpha_{2}}{g} , where the α n 's are the attenuation (or gain) constants associated with the various regions of the junction structure. Curves of P/nR , f , and g as a function of active region thickness are given from which the condition for laser oscillation or the net gain or loss per unit length of a given device may be found.
115 citations