Fundamentals of Engineering Electromagnetics 1st Edition by David Cheng

Exercise 6

A microwave oven cooks food by irradiating the food with microwave power generated by a magnetron. Assuming the dielectric constant of a beef steak to be 40 with a loss tangent of 0.35 at an operating frequency 2.45 (GHz), use the electric field amplitude given in Example 7-3 to calculate the average power per cubic meter. (Neglect skin effect , which will be discussed in Subsection.)