scholarly journals The Analysis of Shielding Effectiveness of the enclosure of an EMI-Filter for a Spacecraft Power Bus

2021 ◽  
Vol 15 ◽  
pp. 470-475
Author(s):  
Yevgeniy Zhechev ◽  
Alexander Zabolotsky
Keyword(s):  
Electromagnetic Interference ◽  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Shielding Effectiveness ◽  
Frequency Range ◽  
Dynamic Approach ◽  
Printed Circuit ◽  
Power Bus ◽  
Protection Devices ◽  
Emi Filter

In this paper, the shielding enclosure of an electromagnetic interference (EMI-) filter for a spacecraft power bus was analysed for shielding effectiveness (SE). By using an electro- dynamic approach, the authors conducted simulation in the frequency domain taking into account losses in the shield. The investigation covered the performance of the shielding enclosure with and without the connected cables and the in uence of apertures formed between the enclosurebase and its cover. It was found that the smallest value of the SE of the enclosure is observed for the configuration with unshielded cables. However, whilst maintaining shielding integrity, attenuation of at least 88 dB in the frequency range from 0 to 20 GHz was achieved. In the study, the authors analysed the in uence of printed circuit boards of EMI-filter in the shielded volume on SE of the enclosure and found that they have a weak effect on the SE. In conclusion, there is some practical guidance on the design of similar EMI-protection devices.

Influence of the cavities on the PCB mechanical properties

Circuit World ◽  
2015 ◽  
Vol 41 (2) ◽  
pp. 76-79
Author(s):  
Boleslav Psota ◽  
Alexandr Otáhal ◽  
Ivan Szendiuch
Keyword(s):  
Mechanical Properties ◽  
Resonant Frequency ◽  
Design Methodology ◽  
Printed Circuit Boards ◽  
Measured Data ◽  
Circuit Boards ◽  
Frequency Range ◽  
Content Type ◽  
Printed Circuit ◽  
Acceleration Amplitude

Purpose – The main aim of this paper is to investigate the influence of the cavity coverage on the printed circuit boards (PCB) to the resonant frequency, acceleration and displacement. Design/methodology/approach – Tests were realized on four PCBs with different cavity areas. Frequency range of tests was between 10 and 2,000 Hz with 0.3 g acceleration amplitude. In addition, more simulations were performed to check different setups of the boards. Findings – From the calculated and measured data, it is clear that with the larger cavity area the resonance frequency drops. In case a greater number of components placed in cavities are needed on board, it is appropriate to use multiple smaller cavities than the bigger ones. Originality/value – Results in this paper could be very useful for PCB manufacturers and designers during designing of the new PCBs with cavities for dipped components.

scholarly journals Electromagnetic interference in a multiconductor transmission system – MTL

2019 ◽  
Vol XXII (2) ◽  
pp. 343-351
Author(s):  
Ciocioi I.
Keyword(s):  
Transmission Lines ◽  
Electromagnetic Interference ◽  
Printed Circuit Boards ◽  
Electronic Circuit ◽  
Electromagnetic Coupling ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Different Types ◽  
Correct Function ◽  
Coupling Phenomena

In electrical and electronic practice, many connection and transmission elements (cables) are used as a multi-conductor transmission lines (MTL). The electromagnetic fields existing in the environment of these multiconductor transmission lines and can generate different types of coupling phenomena, causing EMC problems by the appearance of the unwanted EMI, disturbing the correct function and altering the information. Electromagnetic coupling between the circuits/cables of a circuit (also known as crosstalk) can also occur between the signal and power paths of an assembly made on printed circuit boards, PCB (printed board circuit), so it is important that when designing such an electrical / electronic circuit, these aspects should be taken into account.

Power bus isolation using power islands in printed circuit boards

2002 ◽  
Vol 44 (2) ◽  
pp. 373-380 ◽  
Author(s):  
J. Chen ◽  
T.H. Hubing ◽  
T.P. Van Doren ◽  
R.E. DuBroff
Keyword(s):  
Printed Circuit Boards ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Power Bus ◽  
Power Islands
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