Application of Awe Along with a Combined Fem/Mom Technique to Compute RCS of a Cavity-Backed Aperture in an Infinite Ground Plane Over a Frequency Ran

By: Nasa, National Aeronautics and Space Adm

A hybrid Finite Element Method (FEM)/Method of Moments (MoM) technique in conjunction with the Asymptotic Waveform Evaluation (AWE) technique is applied to obtain radar cross section (RCS) of a cavity-backed aperture in an infinite ground plane over a frequency range. The hybrid FEM/MoM technique when applied to the cavity-backed aperture results in an integro-differential equation with electric field as the unknown variable, the electric field obtained from the solution of the integro-differential equation is expanded in Taylor series. The coefficients of the Taylor series are obtained using the frequency derivatives of the integro-differential equation formed by the hybrid FEM/MoM technique. The series is then matched via the Pade approximation to a rational polynomial, which can be used to extrapolate the electric field over a frequency range. The RCS of the cavity-backed aperture is calculated using the electric field at different frequencies. Numerical results for a rectangular cavity, a circular cavity, and a material filled cavity are presented over a frequency range. Good agreement between AWE and the exact solution over the frequency range is obtained. Reddy, C.J. and Deshpande, M.D. Langley Research Center NCC1-231; RTOP-522-11-41-02...

• Format: Paperback
• Language: English
• ISBN: 1729107656
• ISBN13: 9781729107652
• Release Date: January 1
• Publisher: Independently Published
• Length: 40 Pages
• Weight: 0.26 lbs.
• Dimensions: 0.1" x 8.5" x 11.0"