Parallel antennas for standard fit hearing assistance devices
View Patent ↗An embodiment of a hearing assistance device comprises a housing, a power source, a radio circuit, an antenna and a transmission line. The radio circuit is within the housing and electrically connected to the power source. The antenna has an aperture, and the radio circuit is at least substantially within the aperture. The transmission line electrically connects to the antenna to the radio circuit. Various antenna embodiments include a flex circuit antenna.
1. A hearing assistance device, comprising:
a housing;
a power source;
a radio circuit within the housing and electrically connected to the power source;
an antenna including first and second parallel loops conforming to opposite perimeters of the device housing, wherein the loops are configured to be electrically fed in parallel and phase is configured to be adjusted between the loops to steer a radiation pattern in a near or far field; and
a transmission line to electrically connect the antenna to the radio circuit.
2. The device of claim 1 , wherein the antenna includes multi-filar wire.
3. The device of claim 1 , wherein the antenna includes metal plating.
4. The device of claim 1 , wherein the antenna includes a metal shim.
5. The device of claim 1 , wherein the antenna is a flex circuit antenna, the flex circuit antenna including a flex circuit.
6. The device of claim 5 , wherein the power source is not within the aperture of the flex circuit antenna.
7. The device of claim 5 , wherein the housing includes an outer shell with an inside surface and an outside surface, and at least a portion of the flex circuit antenna conforms to a portion of the inside surface of the outer shell.
8. The device of claim 5 , wherein the housing includes an outer shell with an inside surface and an outside surface, and at least a portion of the flex circuit antenna is on a portion of the inside surface of the outer shell.
9. The device of claim 5 , wherein the housing has a groove around the radio circuit, and the groove adapted to receive at least a portion of the flex circuit antenna when the flex circuit antenna loops around the radio circuit.
10. The device of claim 5 , wherein the housing has a long axis, and the flex circuit antenna forms a loop in a plane substantially parallel to the long axis of the housing, and the aperture has an axis substantially perpendicular to the long axis.
11. The device of claim 5 , wherein the housing has a long axis, and the flex circuit antenna forms a loop in a plane substantially perpendicular to the long axis of the housing, and the aperture has an axis substantially parallel to the long axis.
12. The device of claim 11 , wherein the flex circuit antenna includes a first portion, a second portion and a third portion, the first and second portions form a first aperture, the first and third portions form a second aperture, and the second and third portions are electrically connected in parallel.
13. The device of claim 12 , wherein the power source is excluded from either the first or second apertures.
14. The device of claim 12 , wherein the first and second apertures have nonparallel center axes.
15. The device of claim 5 , wherein the radio circuit includes a hybrid radio circuit.
16. The device of claim 15 , wherein the hybrid radio circuit includes a radio, an EPROM and a digital signal processor.
17. The device of claim 5 , further comprising a microphone, a receiver, and signal processing circuitry connected to the antenna, the microphone and the receiver.
18. The device of claim 17 , wherein the microphone and the receiver are not within the aperture of the flex circuit antenna.
19. The device of claim 5 , wherein the flex circuit antenna includes a conductor layer between dielectric layers.
20. The device of claim 19 , wherein the dielectric layers includes a polyimide material.