Optimization of Carbon Fiber Composite for Microwave Absorber

Optimization of the carbon fiber composite for a microwave absorber is presented. The predicted results are based on the modulus of permittivity which obeys a logarithmic law of mixtures while the dielectric loss tangents are related through a linear law of mixtures. Linear regression analysis performed on the data points provides the constants which are used to predict the effective permittivities at different frequencies. An optimization program is written to compute the optimum amount of carbon fiber paste and thickness required for each layer. As shown, the predicted results agree quite well with the measured data.