Antenna designs for hearing instruments
A hearing instrument comprises a housing that defines a cavity; a printed circuit board (PCB) disposed within the cavity; an antenna that comprises an internal portion and an external portion, wherein a first location on the internal portion of the antenna is disposed within the cavity and is physically connected to the PCB and a different second location on the internal portion of the antenna is physically connected to the external portion of the antenna; and a cable protruding from the housing and configured for use as a handle for removal of the hearing instrument from an ear of a user, wherein the cable encloses the external portion of the antenna.
1 . A hearing instrument comprising:
a housing that defines a cavity;
a printed circuit board (PCB) disposed within the cavity;
an antenna that comprises an internal portion and an external portion, wherein a first location on the internal portion of the antenna is disposed within the cavity and is physically connected to the PCB and a different second location on the internal portion of the antenna is physically connected to the external portion of the antenna; and
a cable protruding from the housing and configured for use as a handle for removal of the hearing instrument from an ear of a user, wherein the cable encloses the external portion of the antenna, wherein the internal portion of the antenna comprises a first segment and a second segment, the first segment extending along an inner surface of a superior side of the housing from the first location to a junction with the second segment, the second segment extending along an inner surface of an anterior side of the housing and an inner surface of an inferior side of the housing.
2 . The hearing instrument of claim 1 , wherein the second segment further extends along an inner surface of a posterior side of the housing.
3 . The hearing instrument of claim 1 , wherein the first segment is substantially triangular.
4 . The hearing instrument of claim 1 , wherein the second segment is substantially rectangular in shape when flat, with an indentation on one side.
5 . The hearing instrument of claim 1 , wherein:
the internal portion of the antenna further comprises a third segment extending in an opposite direction from the second segment at the junction, and
the hearing instrument further comprises an insulating strip that physically connects an end of the second segment to an end of the third segment and substantially prevents electrical current from flowing directly between the second segment and the third segment via the insulating strip.
6 . The hearing instrument of claim 5 wherein: the insulating strip, the second segment of the antenna, and the third segment of the antenna form a physical ring to help secure the internal portion of the antenna within the hearing instrument.
7 . The hearing instrument of claim 1 , wherein the external portion of the antenna comprises two or more wires twisted around each other.
8 . The hearing instrument of claim 1 , wherein the external portion of the antenna comprises a copper trace.
9 . The hearing instrument of claim 1 , wherein the cable comprises a sleeve defining a passage within which the external portion of the antenna is disposed.
10 . The hearing instrument of claim 1 , wherein the antenna comprises a chip antenna physically connected to the external portion of the antenna.