Electromagnetic field communications system for wireless networks
First Claim
1. A method comprising the steps of:
- generating a radio frequency signal;
feeding said frequency signal to a conductor;
said conductor being a conductive array existing within a structure;
creating a quasi-static non-propagating electromagnetic field within said structure, said electromagnetic field extending from said conductor in a manner such that said structure forms a cavity resonator; and
using said electromagnetic field to convey said radio frequency signal to a receiver generally located within said structure.
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Accused Products
Abstract
An Electromagnetic Field Communications System for Wireless Networks for producing an electromagnetic field within a structure is disclosed. The electromagnetic field is produced by using common conductive elements already present within virtually all pre-existing residential commercial, industrial buildings. These conductors, which may include electrical ground shields, wiring, pipes, sprinkler conduits or structural members, are excited with a signal, and become the cavity which contains the electromagnetic field. In preferred embodiments of the invention, signals are generated using the High Frequency, Very High Frequency and lower UHF bands (3 to 30, 30 to 300 and up to 400 MHz). The invention may be used to create a local area network inside the field and within the structure. Devices that include receivers tuned to the electromagnetic field may then be connected and networked. The system may be operated without causing interference to other conventional radio devices outside the structure in the HF band.
14 Citations
15 Claims
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1. A method comprising the steps of:
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generating a radio frequency signal;
feeding said frequency signal to a conductor;
said conductor being a conductive array existing within a structure;
creating a quasi-static non-propagating electromagnetic field within said structure, said electromagnetic field extending from said conductor in a manner such that said structure forms a cavity resonator; and
using said electromagnetic field to convey said radio frequency signal to a receiver generally located within said structure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An electromagnetic field system, comprising:
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a structure including an electrically conductive grid array having a grid opening size; and
means for generating a quasi-static non-propagating electromagnetic filed within said structure by feeding a frequency signal into said electrically conductive grid array;
wherein the frequency of said frequency signal is selected such that the dimension of said grid opening size is small relative to the wavelength of said frequency signal. - View Dependent Claims (15)
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Specification