Communication channels through electrically conducting enclosure

Communications: electrical – Continuously variable indicating – With meter reading

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34082572, 340572, 343909, H04Q 100

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active

057677891

ABSTRACT:
Communication of information between the inside and the outside of an electrically conducting enclosure is performed through the use of a frequency selective surface on the electrically conducting enclosure, which permits passage of electromagnetic waves at particular frequencies, but prohibits waves of other frequencies from penetration. Thus, one or more objects contained within the electrically conducting enclosure, which include radio frequency tags attached to the objects containing information about the objects, may be monitored or interrogated by the transmission of an electromagnetic wave at the permitted frequency through the frequency selective surface. With such a system, control and inventory of enclosed objects may be performed while the EMI shielding function of the electrically conducting enclosure is maintained.

REFERENCES:
patent: 3789404 (1974-01-01), Munk
patent: 4125841 (1978-11-01), Munk
patent: 4862176 (1989-08-01), Voles
patent: 5008661 (1991-04-01), Raj
patent: 5208603 (1993-05-01), Yee
patent: 5278562 (1994-01-01), Martin et al.
patent: 5397863 (1995-03-01), Afzali-Ardakani et al.
B. A. Munk, Frequency-Sensitive (Or -Selective) Surfaces, Reflector Antennas and Their Feed Systems (12), pp. 600-605.

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