Design Of Conformal Composite Absorber With Non-Uniform Resistors Via Characteristic Basis Function Method

A conformal composite absorber with non-uniform resistors was designed to achieve broadband absorption characteristics. An improved characteristic basis function method was proposed, which separates the load-resistors matrices in the inverse of impedance matrices by using the Woodbury matrix inverse lemma. The extraction of characteristic basis functions was accelerated, and the total time of solving the matrix equation was reduced obviously. Finally, a prototype was fabricated and measured with the optimized resistors. The measured results showed that proposed conformal composite absorber achieved good absorption in the 2.8-8.0 GHz for different polarized incident wave.