 Subjects -> ELECTRONICS (Total: 207 journals)
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- Synopsis of the June 2023 Issue of the IEEE Letters on Electromagnetic
Compatibility Practice and Applications-
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Pages: 34 - 36
Abstract: Summary form only: s of articles presented in this issue of the publication.
PubDate:
June 2023
Issue No: Vol. 5, No. 2 (2023)
- Impact of Antenna Tilt on Measurements Below 1 GHz in Semi-Anechoic
Chamber-
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Authors:
Krzysztof Sieczkarek;Adam Maćkowiak;
Pages: 37 - 40
Abstract: The conditions of measurement of radio disturbance emission are defined in the EN 55016-2-3 standard. It defines the detailed requirements of the measuring system and the methodology of the test. In case of the measurement up to 1 GHz, the antenna height scan is required but there is no regulation regarding the antenna tilt in the current edition of standard. As a result, most laboratories perform measurements of radiated emission with a fixed antenna angle of 0°—the antenna is located in parallel with the ground plane despite the actual height. Knowing that the antenna inclination angle in relation to the emission source affects its characteristics, it can lead to omit the measurement configuration at which the measured field strength is the highest. This letter investigates the influence of receiving antenna inclination angle on measurements of radiated disturbances from a reference emission source and real TV-set.
PubDate:
June 2023
Issue No: Vol. 5, No. 2 (2023)
- A Simplified Constrained Bayesian Optimization Approach to Optimize the Tx
Equalization in SerDes Channels-
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Authors:
Majid Ahadi Dolatsara;
Pages: 41 - 47
Abstract: Design of high-speed channels has become increasingly more complicated. Due to the eye diagram closure at higher speeds, designers use Tx equalization by placing a finite impulse response (FIR) filter at Tx. Assigning the FIR tap values can be time consuming and require domain expertise since it can require sweeping hundreds or more combinations of tap values. Therefore, in this letter, we propose a machine learning optimization approach to find the FIR tap values which result in the largest eye opening. Conventional optimization techniques may not be applicable in this context since specifications of the channel can require a constraint, which is the sum of the absolute value of the FIR taps needs to be equal to 1. Therefore, we have developed a simplified constrained Bayesian optimization (BO) approach that can automate this process and expedite calculation of the FIR tap values without requiring domain expertise. Numerical examples are provided to show efficiency of the proposed approach and compare its performance with BO and genetic algorithm for this problem.
PubDate:
June 2023
Issue No: Vol. 5, No. 2 (2023)
- Error Analysis of the Maximum Coupling for HEMP Illumination Tests With
EUT Rotations-
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Authors:
Yuewu Shi;Xin Nie;Yifu Zhou;Zhizhen Zhu;Wei Chen;Wei Wu;
Pages: 48 - 52
Abstract: The maximum electromagnetic (EM) coupling is directly related to the polarization angle of the incident field in the high-altitude EM pulse (HEMP) illumination test. Aimed at the linear system, this letter analyzed the test error of the maximum coupling corresponding to the change of the angle between the polarization direction and the direction of the equipment under test (EUT) in EMP illumination tests. Characterized by the EM norm, the quantization estimation formula of the maximum coupling test error under illuminations with EUT rotations is deduced. The results show that the maximum measurement accuracy is the cosine of 1/2 of the maximum rotation angle of the EUTs. Finally, a test scheme of five illuminations (with rotations of the EUT and the rotation angle of each rotation is 36°) with 95% test accuracy of the maximum coupling of the method itself is recommended in this letter. The results can provide support for the design and evaluation of the EM illumination test.
PubDate:
June 2023
Issue No: Vol. 5, No. 2 (2023)
- Characterizing Transient Radio-Frequency Interference From Motors for the
Square Kilometer Array Radio Telescopes-
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Authors:
Abraham J. Otto;Antheun R. Botha;Paul S. Van der Merwe;Treasure Nkawu;
Pages: 53 - 56
Abstract: This letter considers the characterization of wideband radio-frequency interference generated by motors, diesel generators, as well as fans for the Square Kilometer Array (SKA) radio telescopes. The transient and/or impulsive nature of the emissions from the equipment, required as part of the telescope or ancillary hardware designs, can have a detrimental impact on highly time-sensitive scientific observations, such as pulsar science or gravitational wave detection. Wideband interference from pulses generated by servo motors with pulse-width modulation drivers, diesel generators, and compressor alternating current fans are presented.
PubDate:
June 2023
Issue No: Vol. 5, No. 2 (2023)
- Design of Nanosecond-Level Transient Electric Field Sensor and Its
Application in HVDC Converter Station-
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Authors:
Shaoyin He;Bohao Zhang;Xiaojun Ni;Peng Qiu;Yu Song;Liang Song;
Pages: 57 - 61
Abstract: In this letter, a nanosecond-level transient electric field (E-field) sensor based on a monopole electrically small rod antenna is proposed. The working principle and design process of the sensor are analyzed in detail while a finite-element simulation is carried out to verify the response characteristics of the sensor both in time and frequency domains, whose upper cut-off frequency can reach 680 MHz. For the purpose of assessing the actual detection capability of the sensor in HVDC converter stations, the sensor designed in this letter was used to detect the transient radiation E-field in the valve hall during the artificial short-circuit test in the Zhoushan ±200-kV five-terminal flexible dc transmission project. The measurement results of the transient E-field indicates that the sensor is able to respond instantaneously to the radiated E-field generated by the operation of the key power electronic equipment in the valve hall. It demonstrates that the designed sensor can be effectively applied in the scenario of the measurement of transient electromagnetic environment and noninvasive situational awareness technology for high-voltage devices in HVDC systems.
PubDate:
June 2023
Issue No: Vol. 5, No. 2 (2023)
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