IEEE SAN DIEGO EMC AND PRODUCT SAFETY CHAPTER TALK

## IEEE SAN DIEGO EMC AND PRODUCT SAFETY CHAPTER TALK

CISPR and ANSI C63® Overview on Site Validation Measurements from 18 GHz to 40 GHz - Latest Advances in EMC Test Site Evaluation Using Advanced Antenna Measurement Techniques


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By Zhong Chen, Chief Engineer, ETS-Lindgren, Cedar Park, Texas, USA


**Abstract: **This presentation introduces a novel approach for EMC chamber validation beyond 18 GHz, currently under consideration in ANSI C63 and CISPR standards. By integrating Cylindrical Mode Filtered Site Voltage Standing Wave Ratio (CMF SVSWR) with Compressed Sensing (CS), we address inherent challenges in traditional SVSWR methods, such as inconsistency and slow data acquisition. CMF SVSWR utilizes circular path measurements and mode domain post-processing to discern antenna and chamber reflections, crucial for comprehensive VSWR analysis. Compressed Sensing, a data-driven machine learning technique, exploits signal sparsity to reconstruct data from fewer randomly sampled measurement points, thereby reducing test times and eliminating the need for precise turntable positioning.
Cylindrical Mode Filtered SVSWR Demonstration
Demonstration Abstract: The Cylindrical Mode Filtered SVSWR (CMF SVSWR) is measured by placing the transmit antenna (typically a low gain omni-directional antenna) at the edge of the turntable and performing a single cut vector pattern measurement. The vector S21 as a function of turntable angle at each frequency is transformed to the spectrum domain, where a filter can be applied to mathematically remove the chamber effects. The SVSWR is derived by comparing the original pattern in the chamber to the “clean” filtered pattern. This CMF SVSWR provides a more comprehensive evaluation of the EMC chamber quiet zone and can be readily measured without any special positioning fixtures. The demonstration will show an entire measurement process including the post processing which can be performed in real time. This new measurement technique is under consideration for the new draft standard ANSI C63.25.3 under development by the ANSC C63® committee for EMC test sites from 18 GHz to 40 GHz.
Speaker Bio:
Zhong Chen is Chief Engineer at ETS-Lindgren, located in Cedar Park, Texas. He has over 25 years of
experience in RF testing, anechoic chamber design, as well as EMC antenna and field probe design and
measurements. He is an active member of the ANSC C63® committee currently serving as Vice-Chair
and is the immediate past Chair of Subcommittee 1 which is responsible for the antenna calibration
(ANSI C63.5) and chamber/test site validation standards (ANSI C63.4 and the ANSI C63.25 series). Mr.
Chen is chair of the IEEE Standard 1309 committee responsible for developing calibration standards for
field probes, and IEEE Standard 1128 for absorber evaluation. Currently he is a member of the IEEE EMC
Society Board of Directors and a former member of the Antenna Measurement Techniques Association
(AMTA) Board of Directors. He is a past Distinguished Lecturer for the EMC Society and is recognized as
an AMTA Fellow. His research interests include measurement uncertainty, time domain measurements
for site validation and antenna calibration, and development of novel RF absorber materials. Several
papers authored and co-authored by Mr. Chen have received best paper recognition at global
conferences. Zhong Chen received his M.S.E.E. degree in Electromagnetics from the Ohio State
University at Columbus. He may be reached at zhong.chen@ets-lindgren.com

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• Date: 06 Oct 2025
• Time: 06:00 PM PDT to 08:00 PM PDT

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