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Zhong Chen, Zubiao Xiong, Dennis Lewis
Quiet Zone (QZ) reflectivity levels in an anechoic chamber are typically qualified using free-space VSWR method. The VSWR method consists of a series of scalar measurements along a linear distance. The free-space VSWR, however, provides no information about the locations or directions …
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Yuxin Wu, vkhalidov, Santiago Castro, Gu Wang et autres
Detectron2 is FAIR's next-generation research platform for object detection and segmentation.
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A novel method is presented to overcome the accuracy problem in the ray tracing method for anechoic EMC chamber modeling, with minimum increase in computing time and resources. The algorithm approximates absorber arrays as multi-layered flat structures through a homogenization technique. The …
Time domain gating in vector network analyzers (VNAs) is used widely in EMC and other RF measurement applications. Conceptually, it is straightforward - the analyzer first converts frequency domain data to time domain via inverse Fourier transform, and a gate is applied …
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Time domain gating is a well-known signal processing technique by first converting frequency domain data to time domain via inverse Fourier Transform. Time domain gating is thereafter applied as a filter to include or exclude certain time periods. One of the side …
Mengna Yang, David R. Jackson, Ji Chen, Zubiao Xiong et autres
A novel localization algorithm, which considers nonline-of-sight (NLOS) propagation, is proposed in this paper. By introducing a transfer function that relates the field at a given receiver to the source as a function of frequency and position, the NLOS effect can be …
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A hybrid method that combines the finite element method (FEM), the Floquet mode analysis and the shooting and bouncing ray method (SBR) is presented to solve the quiet-zone field in large tapered anechoic chambers. In the method, the field equivalence principle is …
Garth D'Abreu, Zubiao Xiong, Zhong Chen
The increasing demand for sensors and systems that use RF communication in one form or another in modern vehicles is driving the growing degree of complexity and control system density. For many of these systems, it is necessary to perform some level …
Time domain gating is a common technique in antenna measurements to remove or evaluate the effects of extraneous reflections. Complex valued frequency domain response is transformed to time domain impulse response via Inverse Fourier Transform, so time gating can be applied. This …
Conventional closed-form homogenizing rules may be not accurate if the contrast of material properties is high, such as the case of ferrite tiles with gaps used in EMC anechoic chambers. A new homogenization method is proposed to handle such extreme cases. It …
Guidance on accounting for site imperfections in the uncertainty evaluation of emissions measurement result is provided by CISPR 16-4-2. Site Voltage Standing Wave Ratio (SVSWR) results from the chamber are used as the basis for estimating the uncertainty contributions due to the …
Zubiao Xiong, Zhong Chen, Ji Chen
An efficient method is presented to numerically model anechoic chambers ranging from VHF to microwave frequencies. In this method, an approximate image theory is proposed to improve the accuracy of plane wave assumptions used at lower frequencies. At high frequencies, an efficient …
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