RCS Estimation of Singly Curved Dielectric Shell Structure with PMCHWT Method and Experimental Verification

Area of Science:

• Electromagnetic theory
• Computational electromagnetics
• Materials science

Background:

• Accurate electromagnetic scattering analysis is crucial for stealth technology and radar cross-section (RCS) prediction.
• Dielectric structures, particularly singly curved ones, present unique challenges in electromagnetic analysis.
• Existing methods may lack efficiency or accuracy for complex geometries like aircraft canopies.

Purpose of the Study:

• To develop and validate a numerical algorithm for the electromagnetic scattering analysis of singly curved dielectric structures.
• To apply the developed algorithm to realistic scenarios, such as fighter aircraft canopies.
• To provide experimental verification for the numerical method's accuracy.

Main Methods:

• Utilized the Poggio-Miller-Chang-Harrington-Wu-Tsai (PMCHWT) method, a Method of Moments (MoM)-based solution.
• Employed the Electric Field Integral Equation (EFIE) formulation for multi-region dielectric scattering.
• Implemented the PMCHWT algorithm in C++ and conducted bistatic RCS calculations for canonical structures.

Main Results:

• The PMCHWT algorithm demonstrated accuracy in calculating bistatic RCS for both conductive and dielectric canonical structures.
• Experimental RCS measurements were performed under quasi-anechoic conditions, including calibration methods.
• Excellent agreement was observed between analytical PMCHWT results and experimental monostatic RCS data for singly curved dielectric structures.

Conclusions:

• The developed PMCHWT-based numerical algorithm is a reliable tool for electromagnetic scattering analysis of singly curved dielectric structures.
• The method shows significant potential for application in analyzing complex geometries, such as fighter aircraft components.
• Experimental validation confirms the accuracy and effectiveness of the proposed numerical approach.