System and method for determining attenuation of electromagnetic waves impacting an electromagnetic shield
First Claim
1. 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.
1 Assignment
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Accused Products
Abstract
A method for determining attenuation of electromagnetic waves impacting an electromagnetic shield. A reference amplitude is provided. A signal exhibiting a first frequency is converted to a converted signal exhibiting a second frequency higher than the first frequency. Electromagnetic waves corresponding to the converted signal are transmitted from a first antenna toward a second antenna with the electromagnetic shield positioned between them. Attenuated remnants of the electromagnetic waves received by the second antenna are converted to a corresponding signal exhibiting a third frequency that is lower than the second frequency. The amplitude of the corresponding signal is compared to the reference amplitude.
22 Citations
17 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for determining the effectiveness of an electromagnetic shield to shield electromagnetic waves in a microwave frequency range by determining an attenuation level of the electromagnetic waves impacting the electromagnetic shield, the system comprising:
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a first converter receiving a first signal exhibiting a first frequency that is lower than the microwave frequency range and converting 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 positioned on a side of the electromagnetic shield receiving the second signal for transmitting corresponding electromagnetic waves substantially exhibiting the second frequency through the electromagnetic shield toward a second antenna positioned on another side of the electromagnetic shield, the second antenna receiving attenuated remnants of the electromagnetic waves attenuated by the electromagnetic shield and producing a corresponding 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 for transmission to a measuring receiver.
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13. A system for determining an attenuation level of electromagnetic waves impacting an electromagnetic shield, the system comprising:
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a first converter receiving a first signal exhibiting a first frequency and converting the first signal to a second signal exhibiting a second frequency higher than the first frequency; a first antenna positioned on a side of the electromagnetic shield receiving the second signal for transmitting corresponding electromagnetic waves substantially exhibiting the second frequency through the electromagnetic shield toward a second antenna positioned on another side of the electromagnetic shield, the second antenna receiving attenuated remnants of the electromagnetic waves attenuated by the electromagnetic shield and producing a corresponding 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 for transmission to a measuring receiver, and an attenuator coupled between the first converter and the first antenna for decreasing amplitude of the signal transmitted to the first antenna and to the measuring receiver for testing accuracy of the attenuation determination.
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14. A method for determining an attenuation level of electromagnetic waves impacting an electromagnetic shield, the method comprising:
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converting a produced signal exhibiting a first frequency to a converted signal exhibiting a second frequency higher than the first frequency; transmitting electromagnetic waves corresponding to the converted signal from a first antenna toward a second antenna without the electromagnetic shield positioned between the first antenna and the second antenna; converting the electromagnetic waves received by the second antenna to a corresponding signal exhibiting a third frequency lower than the second frequency; determining a first amplitude of the corresponding signal, thereby providing a reference amplitude; transmitting the electromagnetic waves corresponding to the converted signal from the first antenna toward the second antenna with the electromagnetic shield positioned between the first antenna and the second antenna; converting attenuated remnants of the electromagnetic waves received by the second antenna to a second corresponding signal exhibiting a fourth frequency lower than the second frequency; determining a second amplitude of the second corresponding signal; and comparing the second amplitude to the reference amplitude. - View Dependent Claims (15, 16, 17)
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Specification