Device and method for reducing harmful effects of electromagnetic radiation

• US 8,937,516 B2
• Filed: 07/14/2009
• Issued: 01/20/2015
• 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
• Primary Examiner(s): Takaoka, Dean O
• Assistant Examiner(s): Wong, Alan
• Application Number:
  US13/054,116
• Publication Number:
  US 20110128050A1
• Time in Patent Office: 2,016 Days
• Field of Search: 333/12, 343/700.R, 343/749
• US Class Current: 333/12
• 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 reducing harmful effects to people of a first alternating electromagnetic field that is characterized 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 characterized 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. A device for reducing harmful effects to people caused by radiation from an electromagnetic device for mobile or wireless communication, comprising:

an electromagnetic communications device configured to produce a first alternating electromagnetic field at a first frequency and in a spectral range which is harmful to people, wherein the first frequency corresponds to a harmonic frequency belonging to a carrier frequency of a radio frequency (RF) or wireless communication technology;

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 the second electromagnetic field is not harmful to people;

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.

2. A device according to claim 1, wherein the second frequency f2 (in Hz) 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 (in Hz) selected from a group consisting of {22.5 40.0 77.5 78.5 89.5 99.5}.

3. A device according to claim 2, 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.

4. A device according to claim 1, 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.

5. A device according to claim 4, wherein the first antenna and the second antenna are composed at least in part of the same components.

6. A device according to claim 4, wherein the first and the second tuned circuit are composed at least in part of the same electrical components.

7. A device according to claim 4, 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.

8. A device according to claim 4, 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.

9. A device according to claim 4, wherein at least one of the first and second tuned circuit comprises a dissipating element.

10. A device according to claim 1, further comprising an at least partly closed metal housing.

11. A device according to claim 1, further comprising a liquid accommodated in a housing, wherein said liquid comprises at least one of ethanol and water.

12. A method of reducing harmful effects to people caused by radiation from an electromagnetic device for mobile or wireless communication, comprising the steps of:

producing with an electromagnetic communications device a first alternating electromagnetic field at a first frequency and in a spectral range which is harmful to people, wherein the first frequency corresponds to a harmonic frequency belonging to a carrier frequency of a radio frequency (RF) or wireless communication technology;

extracting electric power from the first alternating electromagnetic field;

transmitting a second alternating electromagnetic field that is characterised by a second frequency, wherein the second electromagnetic field is not harmful to people;

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

13. A method according to claim 12, wherein the second frequency f2 (in Hz) 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 (in Hz) chosen from a group comprising {22.5 40.0 77.5 78.5 89.5 99.5}.

14. A method according to claim 13, 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.