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- Ekman, Jonas, et al.
(author)
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Electromagnetic shielding capabilities of conductive thermoplastic materials and three measurement methods for evaluation
- 2002
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Reports (other academic/artistic)abstract
- This report summarizes the work to compare 12 conductive thermoplastics using three measurement methods. The 12 thermoplastic materials were chosen to observe the influence of variation of base polymer, variation of additives, different mechanical properties and processing and mouldability properties. Test samples were manufactured to be useful in fixtures for far field insertion loss measurements, and to load a coaxial transmission line. Boxes were made to make an enclosure for an electric field source, this arrangement was used for simple application-like near field insertion loss measurements. With all three methods data was obtained in the frequency range from 100 MHz to 1000 MHz for- far field shielding effectiveness- near field shielding effectiveness- complex permeability- complex permittivityResults were obtained showing that variations in the manufacturing process where extra heated thermoplastics or yeast additive was tested, did not improve the shielding efficiency for the particular compounds that was used. The mesurements indicates that a higher amount of additive improves both the near field SE and the far field SE. Measured far field SE is in good agreement with the numerical simulations based on the measured material data.
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| 2. |
- Lundgren, Urban, et al.
(author)
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Analysis of printed antenna structures using the partial element equivalent circuit (PEEC) method
- 2001
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In: Conference proceedings : EMB 01. - : Uppsala universitet. - 9163116294
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Conference paper (peer-reviewed)abstract
- The partial element equivalent circuit (PEEC) method is a electromagnetic simulation technique suitable for mixed circuit and field problems. The technique is numerically equivalent to a method of moments solution using Galerkin solution. In this paper, the PEEC method is illustrated and applied to printed antenna structures where measurements are compared to simulations and analytical solutions. The possibility to use simplified PEEC models to decrease computation time is discussed with illustrative examples.
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