This paper presents an improved open transverse electromagnetic (TEM) cell for pre-compliance testing. The design shows a 300 mm septum height and works over CISPR Bands C and D (from 30 MHz to 1 GHz). The improvement lies in its do-it-yourself construction, enabling in-house manufacturing using laser-cut, bendable sheet metals with rectangular slots removed to ease bending. The resulting structure is cost-effective and mechanically robust. 3D-printed supports extending only between the septum and the upper conductor improve the accessibility to the test volume. The design is tested experimentally (minimum return loss of 11.5 dB), and its reproducibility is validated over four independently assembled samples.

Complying with the harmonized standards, that is, the principally applied rule-based electromagnetic compatibility (EMC) approach, does not always ensure EMC in practice. It is also just a presumption of conformity with the Essential Requirements, as stated in the European Directive for EMC. There is a need for a robust and durable methodology that accounts for factors which are not covered by current EMC standards: the risk-based EMC approach. The term “risk-based EMC” along with the associated terminology is commonly interpreted differently by manufacturers, technicians, and users. This letter clarifies this often misused terminology. First, a comparison between the so-far implemented rule-based EMC approach and the up-and-coming risk-based EMC approach is made. Then, the application of risk-based EMC via a risk management-based methodology is proposed. The goal of this research is to provide an overview on the need of risk-based EMC, list the so-far used (or misused) terminology, and create a common platform of risk management-based methodology, which will act as a guidance tool for EMC engineers when it comes to clear and consistent communication and application of EMC engineering.

Saturation of common-mode chokes in high-power and wide-frequency band applications leads to elevated EMI levels that negatively impact the primary system and nearby devices. However, detecting such common-mode choke saturation is often complex, time-consuming, and costly. This paper presents a method for detecting core saturation by introducing a highfrequency signal alongside the operational frequencies, including the fundamental switching signal and its harmonics, of a highpower system. To validate the concept, the technique is tested in a controlled environment using a high-frequency detection signal combined with a low-frequency saturating current. Experimental results confirm the method’s feasibility, and recommendations for practical implementation are provided.

Mobile communication systems are essential for expanding the operational range of industrial drones. However, electromagnetic (EM) noise from onboard electronics can be a source of intrasystem electromagnetic interference (EMI), which may lead to receiver sensitivity degradation. This issue is particularly critical in industrial drones, for which miniaturization and weight constraints limit the application of conventional EMI countermeasures. The impacts of non-Gaussian EMI vary depending on its temporal and spectral structures, and such impacts on various wireless systems have been reported. The degree and nature of impacts are often highly dependent on the specific communication scheme. In this study, we focus on an intrasystem EMI problem specific to a drone platform, evaluating the effects of frequency-domain characteristics of EMI that are typical of noise generated by onboard drone equipment on LTE communication performance. White noise from the power module and clock-driven harmonic noise from the control module were modeled and evaluated using a wireless communication simulator. The results showed that both noise types degrade receiver sensitivity, with clock-driven harmonic noise having stronger impacts when the total in-band power is equal. Since this degradation occurs during down conversion and demodulation, the findings apply beyond the 800 MHz band. These results highlight the importance of considering not only total noise power but also spectral composition in EMI mitigation strategies. The proposed simulation-based EMI analysis can be an efficient approach to evaluating EMI effects in mobile communication systems, particularly during the early design phase of compact and lightweight electronic devices. While the results are specific to the evaluated drone, the proposed simulation-based EMI analysis provides a broadly applicable framework for assessing EMI effects in mobile communication systems.