npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041


Research Paper

New Phys.: Sae Mulli 2021; 71: 464-468

Published online May 31, 2021

Copyright © New Physics: Sae Mulli.

Evaluations of Shielding Effectiveness in the Broadband Frequency Region up to 18 GHz by Using Flanged Coaxial Transmission Lines

Wongyu JANG, Baekil NAM, Minji GU, Shanigaram MALLESH, Ki Hyeon KIM*

Department of Physics, Yeungnam University, Gyeongsan 38541, Korea


Received: January 7, 2021; Revised: March 26, 2021; Accepted: April 9, 2021


We have designed a jig that employed the flanged, coaxial transmission line through a 3D finite-element-method (FEM) simulation to measure the broadband electromagnetic (EM) shielding effectiveness (SE) in the frequency range from 0.5 GHz to 18 GHz. The flanged, coaxial transmission line comprises the ground (outer diameter: 7.00 mm) and the signal line (inner diameter: 3.04 mm). Representative specimens were prepared with metallic materials (Al, Ni, Cu sheets, \& Ni mesh) and non-metallic materials (graphene oxide and magnetic polymer composite) to evaluate the SE. We analyzed the EM properties, the reflection, absorption, and total EM SE, of the fabricated specimens. Further, the SE results acquired from the flanged, coaxial transmission line which compared with those of a rectangular waveguide by measuring the S parameters. The SE measured using the flanged, coaxial transmission line correlates well with those of the rectangular waveguides (WR-90, WR-62).

Keywords: Shielding effect, Flanged coaxial transmission line, Rectangular waveguide, Broadband, ASTM D4935

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