So, I took a rectangular box and assigned an air material. Set two wave ports to the opposite face. I want to calculate the impedance with E & H calculation by field calculation. I hope it will be near to 377. But whenever I try to evaluate Mag_E or H, it shows this error. Also with geometry chosen, the same error! What should I do actually?
My plane to calcualte E & H, and then Z! Is it a right way?