Scattering analysis of nonlinearly loaded antennas

A novel technique-Volterra series analysis-is applied to the analysis of a nonlinearly loaded antenna. The electromagnetic field problem is first reduced to a network problem by application of the method of moments. The nonlinear network problem is then solved using the Volterra technique. A procedure with sinusoidal inputs for obtaining a time domain solution from the frequency domain solution without using fast Fourier transform techniques is demonstrated. The characteristic of the nonlinear load is approximated from scattered power measurements. The derived characteristic is then used to predict scattered power levels at different intermodulation responses of the loaded antenna.