CHAPTER 20Microwave Waveguides and Antennas
CAUTION Microwave RF energy is dangerous to your health! Anything that can cook meat can also cook you! The U.S. government sets the safety limit for microwave exposure at 10 mW/cm2 averaged over 6 min; some other countries use a level 
of the U.S. standard. The principal problem is tissue heating, and eyes seem especially sensitive to microwave energy. Some authorities believe that cataracts form from prolonged exposure. Some authorities also believe that genetic damage to offspring is possible as well as other long-term effects as a result of cumulative exposure.
Because of their relatively high gain, ...
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