RADIATION ATTENUATION
First Claim
1. A device for attenuating electromagnetic radiation in a frequency band in which transmission is desired comprisinga generally planar substrate, anda resistive pattern arranged on said substrate, said resistive pattern adapted to reflect a proportion of incident radiation in said desired transmission band.
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Accused Products
Abstract
A device for attenuating electromagnetic radiation in a desired transmission frequency band. The device includes a generally planar substrate, and a resistive pattern arranged on the substrate adapted to reflect a proportion of incident radiation in the transmission band. The resistive pattern may be screen printed using carbon based ink. This provides a simple, cheap and easy to fabricate device which can quickly and easily be affixed to the exterior of an antenna or antenna housing to attenuate the power of radiation in the transmission band, resulting in reduced range or sensitivity.
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Citations
20 Claims
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1. A device for attenuating electromagnetic radiation in a frequency band in which transmission is desired comprising
a generally planar substrate, and a resistive pattern arranged on said substrate, said resistive pattern adapted to reflect a proportion of incident radiation in said desired transmission band.
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12. A transducer arrangement for transmitting electromagnetic radiation in a desired transmission band, said arrangement comprising
an antenna for producing electromagnetic radiation in said transmission band, and a substantially planar attenuator comprising a resistive pattern arranged adjacent to said antenna such that radiation in said desired transmission band is incident thereon, wherein said resistive pattern is adapted to reflect a proportion of said incident radiation in said desired transmission band.
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16. A method for attenuating an antenna producing radiation in a defined frequency band, said method comprising:
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providing a patterned resistive element adapted to reflect a proportion of incident radiation in the defined frequency band, and locating said element adjacent to said antenna so as to allow a controlled proportion of radiation in said defined band to be transmitted beyond said element. - View Dependent Claims (17, 18, 19, 20)
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Specification