INCREASING ANTENNA PERFORMANCE FOR WIRELESS HEARING ASSISTANCE DEVICES
Disclosed herein, among other things, are methods and apparatus for increasing antenna performance for hearing assistance devices. One aspect of the present subject matter includes a receiver-in-canal (RIC) hearing assistance device for a wearer including an antenna within a device housing, an audio receiver configured to be worn in an ear canal of a wearer, and a cable assembly configured to connect the audio receiver to the device housing. A circuit component, such as a ferrite bead or an inductor, is connected to the cable assembly and configured to adjust coupling between the cable assembly and the antenna by modifying high frequency current through the wires of the cable assembly. According to various embodiments, the circuit component is configured to enhance radiation from the cable assembly conductors to assist in wireless communications. In other embodiments, the circuit component is configured to limit and make more consistent the radiation from the cable assembly conductors that interfere with antenna transmissions.
1 . A receiver-in-canal (RIC) hearing assistance device for a wearer, comprising:
a device housing;
an antenna within the device housing;
an audio receiver configured to be worn in an ear canal of a wearer;
a cable assembly configured to connect the audio receiver to the device housing; and
a circuit component connected to the cable assembly and configured to control coupling between the cable assembly and the antenna by enhancing high frequency current through wires of the cable assembly.
2 . The device of claim 1 , wherein the circuit component includes a ferrite bead.
3 . The device of claim 1 , wherein the circuit component includes an inductor.
4 . The device of claim 1 , wherein the circuit component includes a capacitor.
5 . The device of claim 1 , wherein the circuit component is connected in series with the cable assembly.
6 . The device of claim 1 , wherein the circuit component is connected to the cable assembly adjacent to the device housing.
7 . The device of claim 1 , wherein the circuit component is located adjacent the device housing outside of an antenna aperture.
8 . The device of claim 1 , wherein the circuit component is located in the cable assembly adjacent the audio receiver.
9 . The device of claim 1 , wherein the circuit component is adjustably located along the cable assembly.
10 . The device of claim 9 , wherein the circuit component is configured to be adjusted for a prescribed electrical length.
11 . The device of claim 9 , wherein the circuit component is configured to be adjusted for a prescribed radiation efficiency of the cable assembly.
12 . The device of claim 9 , wherein the circuit component is configured to be adjusted for a prescribed sensitivity to head gap variation.
13 . The device of claim 1 , comprising multiple circuit components connected in series to the cable assembly.
14 . A method, comprising:
connecting a circuit component to a cable assembly configured to connect an audio receiver configured to be worn in an ear canal to a hearing assistance device housing, the circuit component configured to control coupling between the cable assembly and the antenna by enhancing high frequency current through wires of the cable assembly.
15 . The method of claim 14 , wherein connecting a circuit component to a cable assembly includes connecting a ferrite bead to the cable assembly.
16 . The method of claim 14 , wherein connecting a circuit component to a cable assembly includes connecting an inductor to the cable assembly.
17 . The method of claim 14 , wherein connecting a circuit component to a cable assembly includes connecting a capacitor to the cable assembly.
18 . The method of claim 14 , further comprising connecting multiple circuit components along the cable assembly.
19 . The method of claim 14 , wherein connecting the circuit component includes connecting the ferrite bead or the inductor in series to the cable assembly adjacent the housing.
20 . The method of claim 14 , wherein connecting the circuit component includes connecting the ferrite bead or the inductor adjacent a receiver assembly housing the audio receiver.