Abstract
This study provides comparison of different types of conductive yarns stitched on top of the plain woven fabric via two different structures (parallel and mesh form) for electromagnetic shielding applications. Different types of structures with conductive yarns were investigated for electromagnetic shielding and reflection loss features within the S and X Radar bands. Conductive yarns; namely stainless steel, copper and silver plated polyamide yarns, having different linear resistance values were arranged evenly throughout the woven structure in parallel lines and in mesh form. The S-parameters (S11 and S21) of the woven fabrics were measured using a vector network analyzer in conjunction with a waveguide system incorporating the woven fabric samples. More specifically, the transmission line techniques with waveguides of type WR430 (WG9) and WR90 (WG16) were used; as such, the frequencies between 2.2–3.3 and 8.2–12.0 GHz were tested, respectively. Test results revealed that there is a highly varying shielding effectiveness among samples while there is also a remarkable difference with respect to shielding effectiveness between samples having mesh and parallel structure at horizontal polarizations.
Highlights
Due to the advances in electronic systems and excessive use of electronic and electrical equipment containing digital devices/circuits in the field of industry, military and consumer sections, the problem of the radio-frequency interference or electromagnetic wave interference (EMI) has increased
The SE of the conductive textile samples is similar for each conductive yarn even in both vertical and horizontal polarization
It is shown that there is a remarkable difference between samples having mesh and parallel structures in SE for horizontal polarization in the S frequency range
Summary
Due to the advances in electronic systems and excessive use of electronic and electrical equipment containing digital devices/circuits in the field of industry, military and consumer sections, the problem of the radio-frequency interference or electromagnetic wave interference (EMI) has increased. Cross talk and generation of noise, etc., resulting from electronic and electrical equipments/devices/circuits radiating electromagnetic (EM) waves intentionally or unintentionally (Received October 10, 2018; accepted April 20, 2019; published online May 3, 2019). Miniaturization in electronics and advances in wireless systems over the past decades have increased the problem of electromagnetic interference, which results in reduced performance or damage of the exposed systems.[1,2] Many devices such as digital computers, mobile phones, the cell phone, radar signals, FM/AM radio broadcasting waves, etc.. EMI may affect the proper operation of the exposed systems and cause serious health problems like leukemia, brain tumours, Alzheimer’s disease, allergies, stress and sleep problems, etc.[3,4,5] For these reasons, EM shielding is essential in order to prevent those hazards to human beings and to protect the sensitive circuits from undesired EM
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