Measuring the shielding effectiveness of large textile materials in an anechoic chamber

Kowal, Michał; Kubal, Sławomir; Zieliński, Ryszard

doi:10.1109/emceurope.2012.6396852

Cited by 10 publications

(6 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among the others, for samples of small dimensions, methods include the coaxial transmission line method [29][30][31][32] or waveguide methods (see, e.g., [33]) and the reverberation chamber method [34,35]. In the case of large size samples, free-space measurement [36], shielded room [7] and transmission measurements in anechoic chamber [37] are generally used.…”

Section: Introductionmentioning

confidence: 99%

Shielding Effectiveness Measurements of Drywall Panel Coated with Biochar Layers

et al. 2022

View full text Add to dashboard Cite

Shielding against electromagnetic interference (EMI) is a critical issue in civil applications generally solved with metal screens. In recent years, the properties of many composite materials filled with carbon nanotubes or graphene or materials with a carbon-based coating have been analysed with the aim of using them for electromagnetic shielding applications. Among other carbon materials, biochar, derived from biomass and characterized by high carbon content, emerges as a sustainable, renewable, environmentally friendly, and inexpensive material. In this paper, commercial biochar thermally treated at 750 °C is used to coat with several layers common building components such as drywall panel. Shielding effectiveness is measured in the frequency band 1–18 GHz for normal incidence and skew angles 10, 20 and 30 deg in a full anechoic chamber with double ridged, vertically and horizontally polarized broadband horn antennas. The results show that the proposed biochar-coated drywall panels provide a good shielding effectiveness compared to similar solutions, with the advantage of a less expensive and easier to realize building material

show abstract

Section: Introductionmentioning

confidence: 99%

Shielding Effectiveness Measurements of Drywall Panel Coated with Biochar Layers

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The transmitting and receiving frequencies were synchronized by connecting bot the signal generator and the spectrum analyzer to the same Rubidium frequency standar With each frequency change, we provided the system with a warm-up time of sever minutes until a stable signal was received. Once the signal was stable, the free-space tran mission technique [34][35][36][37] was used to compute the attenuation. First, a reference mea urement was taken with the empty sample holder.…”

Section: Measurement Proceduresmentioning

confidence: 99%

Car Bumper Effects in ADAS Sensors at Automotive Radar Frequencies

Expósito,

Chin,

García Sánchez

et al. 2023

Sensors

View full text Add to dashboard Cite

Radars in the W-band are being integrated into car bumpers for functionalities such as adaptive cruise control, collision avoidance, or lane-keeping. These Advanced Driving Assistance Systems (ADAS) enhance traffic security in coordination with Intelligent Transport Systems (ITS). This paper analyzes the attenuation effect that car bumpers cause on the signals passing through them. Using the free-space transmission technique inside an anechoic chamber, we measured the attenuation caused by car bumper samples with different material compositions. The results show level drops lower than 1.25 dB in all the samples analyzed. The signal attenuation triggered by the bumpers decreases with the frequency, with differences ranging from 0.55 dB to 0.86 dB when comparing the end frequencies within the radar band. Among the analyzed bumper samples, those with a thicker varnish layer or with talc in the composition seem to attenuate more. We also provide an estimation of the measurement uncertainty for the validation of the obtained results. Uncertainty analysis yields values below 0.21 dB with a 95% coverage interval in the measured frequency band. When comparing the measured value with its uncertainty, i.e., the relative uncertainty, the lower the frequency in the measured band, the more accurate the measurements seem to be.

show abstract

“…To avoid this problem, in [7] the anechoic chamber is split into two rooms by a metal wall, assuring, this time, that all the transmitted measured signal did indeed pass through the aperture. Technically, this is certainly the best way but, unfortunately, this solution is very difficult to implement if it is not meant to be permanent.…”

Section: Introductionmentioning

confidence: 99%

Efficient setup for the measurement of transmission-coefficients with a single-room anechoic chamber

Niembro-Martin

Pistono

Lemaître-Auger

et al. 2014

2014 IEEE Conference on Antenna Measurements &Amp; Applications (CAMA)

View full text Add to dashboard Cite

This paper describes a new setup for the measurement of transmission coefficient of materials. The proposed setup is a cheap and efficient way to obtain a good isolation between the transmission and reception antennas with a single room anechoic chamber. The dynamic range is better than 60 dB between 3 to 7 GHz and better to 40 dB in the range 0.7-3 GHz. Moreover, this measurement bench is easy to install and does not require modifying the configuration of the absorbents of the anechoic chamber. It is a excellent technique to measure the performances of Frequency Selective Surfaces (FSS).

show abstract

Measuring the shielding effectiveness of large textile materials in an anechoic chamber

Cited by 10 publications

References 3 publications

Shielding Effectiveness Measurements of Drywall Panel Coated with Biochar Layers

Shielding Effectiveness Measurements of Drywall Panel Coated with Biochar Layers

Car Bumper Effects in ADAS Sensors at Automotive Radar Frequencies

Efficient setup for the measurement of transmission-coefficients with a single-room anechoic chamber

Contact Info

Product

Resources

About