DEVICE AND METHOD FOR REDUCING HARMFUL EFFECTS OF ELECTROMAGNETIC RADIATION

• US 20110128050A1
• Filed: 07/14/2009
• Published: 06/02/2011
• Est. Priority Date: 07/14/2008
• Status: Active Grant

• Current Assignee: Sapere Aude B.V.
• Original Assignee: W.W.I.M Ltd.
• Inventors: Wagenaar, Wilhelmus Adrianus Johannes Maris
• Granted Patent: US 8,937,516 B2
• Time in Patent Office: Days
• US Class Current: 327/113
• CPC Class Codes: H01Q 1/245 with means for shaping the antenna pattern, e.g. in order to protect user against rf exposure
• CPC Class Codes: H01Q 17/00 Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
• CPC Class Codes: H01Q 21/30 Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
• CPC Class Codes: H01Q 5/00 Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements combinations of separate active antenna units operating in different wavebands and connected to a common feeder system H01Q21/30
• CPC Class Codes: H04B 1/3838 Arrangements for reducing RF exposure to the user, e.g. by changing the shape of the transceiver while in use

Abstract

The present invention relates to a device and a method for educing harmful effects to people of a first alternating electromagnetic field that is characterised by a first frequency. According to the invention, the device comprises extraction means for extracting electric power from the first alternating electromagnetic field and transmission means for transmitting a second alternating electromagnetic field that is characterised by a second frequency. During operation, the transmission means are supplied with the electric power extracted by the extraction means, and the first and the second frequency are different.

Claims

1-21. -21. (canceled)

22. A device for reducing harmful effects to people of a first alternating electromagnetic field that is characterised by a first frequency, comprising:

extraction means for extracting electric power from the first alternating electromagnetic field;

transmission means for transmitting a second alternating electromagnetic field that is characterised by a second frequency;

wherein during operation the transmission means are supplied with the electric power extracted by the extraction means and wherein the first and the second frequency are different.

23. A device according to claim 22, wherein the second frequency f2 corresponds substantially to a value from the group of natural frequencies given by the equation:

f2=n1×

fn×

10ⁿ²;

where n1 and n2 are integers and fn is a value selected from a group consisting of {22.5 40.0 77.5 78.5 89.5 99.5}.

24. A device according to claim 23, wherein the transmission means are designed to transmit a third alternating electromagnetic field simultaneously with the second electromagnetic field, which third electromagnetic field is characterised by a third frequency that corresponds substantially to a frequency from the group of natural frequencies.

25. A device according to claim 22, wherein the first frequency corresponds to a harmonic frequency belonging to a carrier frequency of a radio frequency (RF) communication technology.

26. A device according to claim 22, wherein the extraction means and the transmission means comprise a first antenna and a second antenna, respectively, for receiving and transmitting the first and the second alternating electromagnetic field, respectively, wherein the first antenna forms part of a first tuned electrical circuit, wherein the second antenna forms part of a second tuned electrical circuit.

27. A device according to claim 26, wherein the first antenna and the second antenna are composed at least in part of the same components.

28. A device according to claim 26, wherein the first and the second tuned circuit are composed at least in part of the same electrical components.

29. A device according to claim 26, wherein the first tuned circuit comprises a discrete coil and/or resistor, said coil and/or resistor having a parasitic capacitance that forms part of the first tuned circuit, wherein the first tuned circuit further comprises a discrete capacitor.

30. A device according to claim 26, wherein the first tuned circuit further comprises a discrete coil and/or resistor, said coil and/or resistor having a parasitic capacitance that forms part of the first tuned circuit, wherein components that carry a current or voltage are provided with an electrically insulating material at an outer side.

31. A device according to claim 26, wherein at least one of the first and second tuned circuit comprises a dissipating element.

32. A device according to claim 26, wherein at least one of the first and second comprises a nonlinear element.

33. A device according to claim 22, further comprising an at least partly closed metal housing.

34. A device according to claim 22, further comprising a liquid accommodated in a housing, wherein said liquid comprises at least one of ethanol and water.

35. A method of reducing harmful effects to people of a first alternating electromagnetic field that is characterised by a first frequency, comprising the steps of:

extracting electric power from the first alternating electromagnetic field;

transmitting a second alternating electromagnetic field that is characterised by a second frequency;

wherein the transmission means are supplied with the extracted electric power.

36. A method according to claim 35, wherein the second frequency f2 corresponds substantially to a value from a group of natural frequencies given by the equation:

f2=n1×

fn×

10ⁿ²;

where n1 and n2 are integers and fn is a value chosen from a group comprising {22.5 40.0 77.5 78.5 89.5 99.5}.

37. A method according to claim 36, further comprising a step of transmitting a third alternating electromagnetic field simultaneously with the transmission of a second alternating electromagnetic field, which third electromagnetic field is characterised by a third frequency that corresponds substantially to a frequency from the group of natural frequencies.