ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Surface wave scattering characteristics of electromagnetic discontinuity and defect structures
Received date: 2023-08-22
Revised date: 2023-10-06
Accepted date: 2023-11-20
Online published: 2023-12-07
Supported by
National Level Project
For stealth vehicle design， when the main scattering sources such as mirror and cavity are suppressed， the echo scattering and spatial scattering produced by surface waves at electromagnetic discontinuities and defective structures become important scattering sources. In order to study the surface wave scattering behaviors of electromagnetic discontinuities and defective structures， a surface wave propagation model is established by planar waveguide excitation. Based on the surface wave propagation model， three kinds of electromagnetic discontinuity or defective structures of aircraft， including curved surface， dihedral inclination angle， gap and step， and the quantitative relationship between key structural parameters and echo scattering intensity and space scattering efficiency is obtained by simulation research. The results show that the surface wave of the convex discontinuous structure scatters and attenuates continuously in the propagation process. When the radius of the convex surface exceeds 10 times the wavelength of the waveguide， the attenuation coefficient is close to 0， while the surface wave of the concave discontinuous structure does not attenuate in the propagation process. When the diplanar dip angle is within the range of 30°， the spatial scattering efficiency of surface wave can be effectively suppressed within 10%， and the echo scattering is weak. There is a half-wave resonance relationship between the surface wave scattering of slots and steps and the structure size， and it is difficult to give attention to both echo scattering and spatial scattering suppression. The research results can provide guidance for the design of surface wave scattering suppression of stealth aircraft.
Longzhou YU , Jiangtao HUANG , Shidong ZHONG , Xian CHEN , Cheng CHEN . Surface wave scattering characteristics of electromagnetic discontinuity and defect structures[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2024 , 45(12) : 329467 -329467 . DOI: 10.7527/S1000-6893.2023.29467
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