This paper deals with an experimental measurement and a numerical simulation of shielding effectiveness of a perforated shielding enclosure using finite element method (FEM). There are shown possibilities of model definitions, differences between 2D and 3D models are discussed. Important part of simulation is the possibility to verify the model results -the simulation result should be verified in terms of total electric energy of the model on the degrees of freedom and the simulation results could be verified by measurements. A solution of illustrative example of shielding effectiveness FEM simulation is shown and the simulation results are verified by the experimental measurement results.
This paper deals with the cavity resonance of perforated shielding boxes, which decrease shielding effectiveness. Shielding effectiveness is very important part of electromagnetic interference (EMI) -the properly designed shielding box eliminates undesired interference from the electric equipment which is placed into the box (power converters, control unit). In this paper, the illustrative example of numerical modeling of the cavity resonance of the perforated shielded box is shown and various methods for results evaluation are described. The results of simulations are confirmed by measurement.
This article presents the design, modeling, and fabrication of a printed log-periodic biconical dipole array antenna (PLPBDA) for electromagnetic compatibility (EMC) measurements. The proposed structure used bow tie-shaped dipoles instead of typical dipoles to achieve a size reduction of 50% and bandwidth enhancement of 170% with the help of PCB technology. Furthermore, the balanced feeding method and the modifications in bow tie-shaped dipole dimensions were utilized to obtain broad bandwidth of 5.5 GHz (from 0.5 GHz to 6 GHz). This structure comprises 12 dipole elements with a compact size of 170 × 160 × 1.6 mm, reflecting low fluctuations gain of about (4.6–7) dBi with the help of an extra dipole. Moreover, the achieved frequency and radiation characteristics (simulated and measured) agree with each other and are compatible with the results of classical EMC antennas. The achievements of this structure showed promising results compared to both literature reviews and reference antenna Hyper LOG® 7060 offered for sale.
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