Patent ID: 7675294

Claim:
A system for determining the effectiveness of an electromagnetic shield to shield electromagnetic waves in a microwave frequency range by determining a level of amplitude attenuation of the electromagnetic waves impacting the electromagnetic shield, the system comprising: a signal generator for producing a first signal exhibiting a first frequency that is lower than the microwave frequency range; a first converter coupled to the signal generator for changing the first signal to a second signal exhibiting a second frequency that is within the microwave frequency range and is higher than the first frequency; a first antenna for converting the second signal to electromagnetic waves substantially exhibiting the second frequency and for transmitting the electromagnetic waves toward the electromagnetic shield; a second antenna for receiving remnants of the electromagnetic waves attenuated by the electromagnetic shield and for converting the remnants to a third signal substantially exhibiting the second frequency; a second converter for converting the third signal to a fourth signal exhibiting a third frequency lower than the second frequency; and a measuring receiver coupled to the second converter for determining amplitude of the fourth signal.