CEDAR PARK, Texas, October 4, 2022 – ETS-Lindgren announced its technical contributions to AMTA 2022, the annual Symposium of the Antenna Measurement Techniques Association (AMTA). The Symposium will be held in person from October 9 to 14 at the Westin Westminster in Westminster, Colorado, ideally situated between Boulder and Denver. The contributions include research papers on varied topics documenting ETS-Lindgren's expertise in wireless Over-the-Air (OTA), EMC, and RF/Microwave Test and Measurement System Solutions. The research papers contributed by ETS-Lindgren will be presented in several sessions, including:

Monday, October 10, Session 1: 5G and Wireless Design and Applications from 9:00 am to 9:54 am, Michael Foegelle, Director of Technology Development, will present the paper "Tunable Cellular Desensitization Using SD Card Data Transfer." In this paper, Dr. Foegelle demonstrates a method for producing repeatable and tunable desensitizing interference in various cell phones using data transfer from an SD memory card. The resulting device can be used as a test artifact for evaluating the ability of different over-the-air test methods (e.g. free-space vs. reverberation chamber) to detect the same level of desensitization.

Wednesday, October 12, Session 10: Antenna Measurements II, from 10:00 am to 11:48 am, Zhong Chen, Director of RF Engineering, will present the paper "Additional Insights into Chamber Effects in the Gain Extrapolation Data Using Empirical Mode Decomposition." Co-authored with Yibo Wang, RF Engineer with ETS-Lindgren, this paper describes a novel method to analyze antenna extrapolation calibration data using Empirical Mode Decomposition (EMD) and Hilbert-Huang Transform (HHT). The method provides additional insights into the reflection sources, such as how the spectral contents of the reflections vary as the antenna travels along the track. As a result of the EMD process, "clean" data with minimal chamber influence is obtained, which can be used to compute the far-field gain. The technique provides yet another powerful post-processing algorithm to reduce chamber effects in the gain extrapolation method.

Thursday, October 13, Session 15: Imaging, Algorithms, and Processing Techniques, from 1:30 pm to 3:00 pm, Yibo Wang will present the paper "A Technique of Holographic Projection from Far-Field Pattern to an Unconstrained Planar Surface." Co-authored with Zhong Chen, this paper proposes a robust back-projection method. The far-field data can be projected to an arbitrary surface while maintaining a high-resolution hologram. It is especially applicable for cases when the Antenna Under Test (AUT) has an arbitrary orientation with an offset from the origin, or for cases where projections are needed onto several surfaces of a multifaceted AUT.

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