Antenna with flared cross-feed in a hearing assistance device
A hearing assistance device such as a hearing aid includes an antenna for wireless communication with another device. The antenna includes two antenna elements and a cross-feed that provides for electrical connection between the two antenna elements. The cross-feed having a flared structure configured to reduce an effect of head loading on the performance of the wireless communication by approximately minimizing capacitive coupling between the cross-feed and a wearer when the hearing assistance device is worn by the wearer.
1. A hearing assistance device configured to be worn by a wearer, comprising:
a circuit configured to perform wireless communication;
an antenna including:
two antenna elements; and
a cross-feed coupled directly between the two antenna elements to provide for electrical connection directly between the two antenna elements, the cross-feed having a flared structure configured to reduce capacitive coupling between the antenna and the wearer;
an antenna feed coupled between the cross-feed and the circuit to provide for electrical connection between the antenna and the circuit; and
a case housing the circuit, the antenna, and the antenna feed.
2. The hearing assistance device of claim 1 , wherein the two antenna elements comprise two antenna loops, and the cross-feed comprises two cross-feed lines each coupled directly between the two antenna loops.
3. The hearing assistance device of claim 2 , wherein the two antenna loops are approximately symmetric and positioned in parallel.
4. The hearing assistance device of claim 3 , wherein the two cross-feed lines each comprise a portion approximately perpendicular to each loop of the two antenna loops.
5. The hearing assistance device of claim 3 , comprising two lines each including a plurality of bends forming the flared structure, the two lines each including a line of the two cross-feed lines.
6. The hearing assistance device of claim 5 , wherein the two lines each comprise a line of the two cross-feed lines and portions of the two antenna loops.
7. The hearing assistance device of claim 5 , wherein the two lines each comprise two approximately 45-degree bends forming the flared structure.
8. The hearing assistance device of claim 3 , comprising a hearing aid including the circuit, the antenna, and the case.
9. The hearing assistance device of claim 8 , wherein the case is configured to be worn behind the ear or over the ear.
10. A hearing assistance device configured to be worn by a wearer having an ear, comprising:
a circuit configured to perform wireless communication;
an antenna feed coupled to the circuit;
an antenna coupled to the circuit via the antenna feed and including:
two antenna loops;
two cross-feed lines each coupled directly between the two antenna loops and coupled to the antenna feed; and
a flared structure formed by at least the two cross-feed lines to reduce capacitive coupling between the antenna and the wearer; and
a case housing the circuit and the antenna.
11. The hearing assistance device of claim 10 , wherein the flared structure is formed by the two cross-feed lines and portions of the two antenna loops.
12. The hearing assistance device of claim 10 , wherein the two cross-feed lines each comprise a plurality of bends.
13. The hearing assistance device of claim 12 , wherein the two cross-feed lines each comprise two approximately 45-degree bends.
14. The hearing assistance device of claim 12 , comprising a hearing aid including the circuit, the antenna, and the case.
15. The hearing assistance device of claim 14 , wherein the hearing aid comprises a behind-the-ear (BTE) type hearing aid.
16. A method for wireless communication to be performed by a hearing assistance device configured to be worn by a wearer, comprising:
providing an antenna including two antenna elements and a cross-feed connected directly between the two antenna elements;
reducing capacitive coupling between the antenna and the wearer by configuring the cross-feed into a flared structure; and
connecting the antenna to a circuit configured to perform the wireless communication using an antenna feed configured to connect the cross-feed to the circuit.
17. The method of claim 16 , wherein providing the antenna comprises providing two antenna loops and two cross-feed lines each connected directly between the two antenna loops.
18. The method of claim 17 , further comprising configuring the two cross-feed lines and portions of the two antenna loops into the flared structure.
19. The method of claim 17 , wherein configuring the cross-feed into the flared structure comprises configuring each line of the two cross-feed lines to include a plurality of bends.
20. The method of claim 19 , wherein configuring the cross-feed into the flared structure comprises configuring each line of the two cross-feed lines to include two approximately 45-degree bends.