Device and method of use for reducing hearing aid RF interference

• US 6,639,564 B2
• Filed: 09/30/2002
• Issued: 10/28/2003
• Est. Priority Date: 02/13/2002
• Status: Active Grant

• Current Assignee: Aerius International, Ltd.
• Original Assignee: Gregory F. Johnson
• Inventors: Johnson, Gregory F.
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): CHEN, SHIH CHAO
• Application Number:
  US10/262,447
• Publication Number:
  US 20030151557A1
• Time in Patent Office: 393 Days
• Field of Search: 343/700.MS, 343/702, 343/718, 381/315, 381/316, 381/321, 381/322
• US Class Current: 343/702
• 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 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 5/328 between a radiating element and ground
• CPC Class Codes: H01Q 5/378 Combination of fed elements with parasitic elements
• CPC Class Codes: H01Q 9/0421 with a shorting wall or a shorting pin at one end of the element H01Q9/0414 takes precedence
• CPC Class Codes: H01Q 9/42 with folded element, the folded parts being spaced apart a small fraction of the operating wavelength

Abstract

An apparatus for reducing hearing aid radio frequency (RF) interference including a directional multi-band and/or single band antenna for use with PWDs such as digital cellphones is disclosed. The apparatus greatly reduces or eliminates the audio noise induced in hearing aids by the PWDs and allows operation of a hearing aid during PWD operation. In operation, the apparatus may be provided on the PWD side away from the user'"'"'s head. The apparatus may be integrated into the PWB during its manufacture or provided as an after market assembly for a PWD that has a port for connection of an external antenna. The apparatus provides for improved front-to-back ratio as compared to antennas currently in use on PWD'"'"'s, and therefore also reduces SAR (specific absorption rate), the level of RF energy received into the head by a PWD.

Claims

1. An apparatus comprising:

a hearing aid having an electronic component for amplifying a signal to be received during use by a human being;

a graspable portable wireless device including reception and transmission circuitry for generating RF signals used to communicate audio communication, said wireless device having an RF signal line, said wireless device having a top and a bottom and being used in proximity to the hearing aid;

a conductive element coupled to a ground plane of said portable wireless device; and

first and second elongated elements each having first and second ends, said first ends being connected to said conductive element, said second ends being directed toward the top of the wireless device, wherein the first elongated element is coupled to the RF signal line at a feedpoint, and wherein said second elongated element is parasitically coupled to the first elongated element.

2. The apparatus of claim 1 wherein the first and second elongated elements are in generally parallel alignment.

3. The apparatus of claim 1 wherein the first and second elongated elements are connected by a conductive crossbar element.

4. The apparatus of claim 3 wherein the crossbar element is generally proximate to the first ends of the first and second elongated elements.

5. The apparatus of claim 1 wherein the first and second elements each have an LC trap assembly connected at respective second ends.

6. The apparatus of claim 5 wherein the LC trap assemblies each include a coiled conductive wire element and a generally planar conductor element.

7. The apparatus of claim 5 wherein the LC trap assemblies each include a pair of coiled conductive wire elements and an intermediate conductor element.

8. The apparatus of claim 6 wherein at least one of the coiled conductive wire elements includes non-uniformly spaced wire windings.

9. The apparatus of claim 1 wherein the wireless device has an external antenna port and the conductive element and first and second elongated elements are operatively coupled through said external antenna port.

10. A method of reducing induced RF noise in a hearing aid when used in close proximity to a wireless device, said wireless device having a top and a bottom when in operation, said method comprising the steps of:

providing a conductive element coupled to a ground plane of the wireless device;

providing first and second elongated conductor elements upon the conductive element, said first and second elongated conductor elements each having a first end connected to the conductive element and a second end, said elongated conductor elements being generally directed toward the top of the wireless device;

coupling the first elongated conductor element to an RF signal line of the wireless device; and

parasitically coupling the second elongated conductor element to the first elongated conductor element during use.

11. The method of claim 10 further comprising the steps of:

coupling LC traps structures at the second ends of the first and second elongated conductor elements.

12. An antenna device for a wireless device for use in conjunction with a hearing aid adapted to be in proximity to a user'"'"'s ear, said wireless device having a top and a bottom when in operation, said antenna device comprising:

a conductive element having a length of at least 0.35 times an operational wavelength, said conductive element having an upper edge and a lower edge defined between a middle portion, said conductive element being coupled to a ground plane element of the wireless device;

a driven conductor element being coupled to the conductive element within the middle portion, said driven conductor including a first element being generally perpendicular to the conductive element and a second element being generally parallel to the conductive element, said second element extending toward the top of the wireless device; and

a parasitic conductor element coupled to the conductive element at the middle portion, said parasitic conductor including a first element being generally perpendicular to the conductive element and a second element being generally parallel to the conductive element, said second element extending toward the top of the wireless device.

13. The antenna device of claim 12 wherein the conductive element is defined as ground traces upon a printed wiring board of the wireless device.

14. The antenna device of claim 12 wherein the conductive element is substantially planar.

15. The antenna device of claim 12 wherein the second elements of the driven conductor element and parasitic conductor element are substantially parallel.

16. The antenna device of claim 12 wherein the first elements of the driven conductor element and the parasitic conductor element are connected together.

17. The antenna device of claim 12 further comprising one or more LC trap structures for effecting a dual-band operability, said LC trap structures being coupled at a free end of either the driven conductor element or the parasitic conductor element or both.

18. An antenna device for a wireless device suitable for use in conjunction with a hearing aid, said wireless device having a top and a bottom when in operation, said antenna device comprising:

a segmented ground plane element including at a plurality of ground plane segments, at least one of said plurality of segments being movable relative to the another one of said plurality of segments;

a driven conductor element being coupled to the segmented ground plane element, said driven conductor element including a first element being generally perpendicular to the segmented ground plane element and a second element being generally parallel to the segmented ground element, said second element extending toward the top of the wireless device; and

a parasitic conductor element coupled to the segmented ground element, said parasitic conductor element including a first element being generally perpendicular to the segmented ground element and a second element being generally parallel to the segmented ground element, said second element extending toward the top of the wireless device.

19. The antenna device of claim 18 wherein the second elements of the driven conductor element and parasitic conductor element are substantially parallel.

20. The antenna device of claim 18 the first elements of the driven conductor element and the parasitic conductor element are connected together element.

21. The antenna device of claim 18 further comprising one or more LC trap structures for effecting a dual-band operability, said LC trap structures being coupled at a free end of either the driven conductor element or the parasitic conductor element or both.

22. An apparatus comprising:

a graspable portable wireless device including reception and transmission circuitry for generating RF signals used to communicate audio communication, said wireless device having an RF signal line, said wireless device having a top and a bottom when in operation;

a conductive element coupled to a ground plane of said portable wireless device; and

an elongated element having a first end and a second end and an intermediate portion therebetween, said first end being connected to said middle portion of the conductive element, said second end being directed toward the top of the wireless device, wherein the elongated element is directly coupled to the RF signal line at a feedpoint.

23. The apparatus of claim 22 further comprising a second elongated element having a first end and a second end, said first end being connected to the conductive element and said second elongated end being directed toward the top of the wireless device, said second elongated element being parasitically coupled to the elongated.

24. The apparatus of claim 23 wherein the conductive element is defined as ground traces upon a printed wiring board of the wireless device.

25. The apparatus of claim 23 wherein the conductive element is substantially planar.

26. The apparatus of claim 23 wherein the elongated element and the second elongated element are connected together.

27. The apparatus of claim 22 further comprising a LC trap structure for effecting a dual-band operability, said LC trap structure being coupled at a free end of the elongated element or the second elongated element or both.