Research on Testing Method for Shielding Effectiveness of Irregular Cavity Based on Field Distribution Characteristics
Abstract
:1. Introduction
2. Electromagnetic Topology Calculation Model of Shielding Effectiveness of Irregular Cavity
2.1. Electromagnetic Topology Modle
- -
- is the voltage vector.
- -
- is the unit hypermatrix.
- -
- S is the scattering matrix.
- -
- is the propagation matrix.
- -
- is the source vector.
2.2. Irregular Cavity Classification
- 1.
- Capacitive step
- 2.
- Inductive step
- 3.
- Capacitive obstacles with a zero thickness value
- 4.
- Inductive obstacles with a zero thickness value
- 5.
- Capacitive obstacles with finite thickness
- 6.
- Inductive obstacles with finite thickness
3. Simulation Analysis of Field Distribution in Irregular Cavity
3.1. Simulation Parameters of Irregular Cavity Field Distribution
3.2. Simulation Results of Field Distribution in the Irregular Cavity
3.2.1. Basic Model Field Distribution
3.2.2. Field Distributions of Capacitive Step and Inductive Step
3.2.3. Field Distributions of Capacitive and Inductive obstacles with a Finite Thickness
3.2.4. Field Distributions of Capacitive and Inductive Obstacles with Zero Thickness
3.3. Analysis of Field Distribution in Special-Shaped Cavity
- 1.
- The effects of irregular structures.
- 2.
- Selection of observation points.
- Irregular cavities mean that the distributions of the front and back parts are different, with the cavity of the step structure being the most obvious part. As the step structure changes the size of the front and back parts of the cavity, and the change in the size of the capacitive step is the height direction, the mode transmission has only a small effect on the overall field distribution since there is no mode transmission in the height direction of the back part of the cavity in the Mode303. However, there are changes in the length direction of the back part of the cavity in the inductive steps, resulting in the coupling of the modes in the front and back parts of cavities.
- The regular cavity is similar to the irregular cavity of the thick block type on the whole, which is mainly reflected in the cross-coupling of the inductive thick block appearance mode.
- As there is a small volume in the cavity that the thin plate takes up, the capacitive thin plate has only a small effect on the field distribution of the cavity. In contrast, the inductive thin plate has more significant effects, which is similar to the inductive thick block.
4. Characterization and Test Method of Shielding Effectiveness of Irregular Cavity
4.1. Characterization of Shielding Effectiveness of Irregular Cavity
4.2. Test Method for Shielding Effectiveness of Irregular Cavity
5. Measurement for Shielding Effectiveness of Irregular Cavity
5.1. Test Parameters
5.2. Test Layout
5.2.1. Reference Test Arrangement
5.2.2. Shield Test Arrangement
5.3. Test Results
6. Conclusions
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Numbering | Type | Heteromorphic Structure Parameters |
---|---|---|
1 | Capacitive step | 300 × 20 × 160 mm3 |
2 | Inductive step | 30 × 120 × 160 mm3 |
3 | Capacitive obstacles with a zero thickness value | 300 × 20 × 1 mm3, d2 +d3 = 180 mm |
4 | Inductive obstacles with a zero thickness value | 25 × 120 × 1 mm3, d2 +d3 = 180 mm |
5 | Capacitive obstacles with a finite thickness | 300 × 10 × 40 mm3, d2 +d3 = 200 mm |
6 | Inductive obstacles with a finite thickness | 20 × 120 × 40 mm3, d2 +d3 = 200 mm |
Test Frequency Band | Location and Number of Observation Points |
---|---|
20 MHz~0.8 fr | Single point: Cavity center position |
0.8 fr~1 GHz | Multi-point: the center position of the x-direction, the y-direction or the center position of the multi-segment division, and the center position of the multi-segment division in the z-direction |
Figure | Type of Transmitting Antenna | Polarization Direction | Shielding Effectiveness/dB |
---|---|---|---|
30 | Biconical antenna | Horizontal | 38.08 |
Vertical | 34.34 | ||
50 | Biconical antenna | Horizontal | 34.5 |
Vertical | 35.85 | ||
80 | Biconical antenna | Horizontal | 32.97 |
Vertical | 33.11 | ||
100 | Biconical antenna | Horizontal | 43.06 |
Vertical | 42.82 | ||
100 | Periodic log antenna | Horizontal | 46.23 |
Vertical | 42.63 | ||
200 | Periodic log antenna | Horizontal | 34.14 |
Vertical | 31.92 | ||
300 | Periodic log antenna | Horizontal | 26.54 |
Vertical | 31.49 | ||
500 | Periodic log antenna | Horizontal | 25.07 |
Vertical | 28.24 | ||
800 | Periodic log antenna | Horizontal | 18.21 |
Vertical | 19.2 | ||
1000 | Periodic log antenna | Horizontal | 14.26 |
Vertical | 16.68 |
Frequency/MHz | Polarization Direction | No.1 SE/dB | No.2 SE/dB | No.3 SE/dB | No.4 SE/dB | No.5 SE/dB |
---|---|---|---|---|---|---|
500 | Horizontal | 25.07 | 24.79 | 26.59 | 24.83 | 24.25 |
Vertical | 28.24 | 28.72 | 27.19 | 28.78 | 27.7 | |
800 | Horizontal | 18.21 | 17.88 | 18.12 | 18.89 | 18.03 |
Vertical | 19.2 | 20.85 | 18.65 | 20.03 | 19.07 | |
1000 | Horizontal | 14.26 | 14.51 | 14.29 | 15.08 | 14.85 |
Vertical | 16.68 | 16.64 | 17.44 | 17.04 | 17.25 |
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Ren, J.; Pan, Y.; Zhou, Z.; Zhang, T. Research on Testing Method for Shielding Effectiveness of Irregular Cavity Based on Field Distribution Characteristics. Electronics 2023, 12, 1035. https://doi.org/10.3390/electronics12041035
Ren J, Pan Y, Zhou Z, Zhang T. Research on Testing Method for Shielding Effectiveness of Irregular Cavity Based on Field Distribution Characteristics. Electronics. 2023; 12(4):1035. https://doi.org/10.3390/electronics12041035
Chicago/Turabian StyleRen, Jinjing, Yuhao Pan, Zhongyuan Zhou, and Tao Zhang. 2023. "Research on Testing Method for Shielding Effectiveness of Irregular Cavity Based on Field Distribution Characteristics" Electronics 12, no. 4: 1035. https://doi.org/10.3390/electronics12041035
APA StyleRen, J., Pan, Y., Zhou, Z., & Zhang, T. (2023). Research on Testing Method for Shielding Effectiveness of Irregular Cavity Based on Field Distribution Characteristics. Electronics, 12(4), 1035. https://doi.org/10.3390/electronics12041035