Hearing assistance device with balanced feed-line for antenna
A hearing assistance device, such as a hearing aid, includes an antenna connected to a communication circuit through a feed-line for wireless communication. The antenna and the feed-line are configured and placed such at capacitance between their conductors is approximately minimized. In one embodiment, the feed-line includes feed-line conductors each including a major portion approximately perpendicular to an antenna conductor. In another embodiment, the feed-line includes a feed-line conductor crossing the antenna conductor, and at least one of the antenna conductor and the feed-line conductor includes a notch in the crossing area to reduce the crossing area.
1. A hearing aid, comprising,
an antenna housed in the hearing aid and including an antenna conductor;
a communication circuit housed in the hearing aid and configured to perform wireless communication using the antenna;
a feed-line providing connections between the antenna and the communication circuit, the feed-line including a feed-line conductor crossing the antenna conductor; and
a crossover between the antenna conductor and the feed-line conductor, the crossover resulting in a capacitance,
wherein at least one of the antenna conductor and the feed-line conductor includes a notch positioned to reduce the capacitance by reducing an area of the crossover.
2. The hearing aid of claim 1 , wherein the antenna conductor includes the notch.
3. The heating aid of claim 1 , wherein the feed-line conductor includes the notch.
4. The hearing aid of claim 1 , wherein the hearing aid comprises a behind-the-ear (BTE) type hearing aid.
5. The hearing aid of claim 4 , wherein the hearing aid comprises a receiver-in-canal (RIC) type hearing aid.
6. The hearing aid of claim 4 , wherein the hearing aid comprises a receiver-in-the-ear (RITE) type hearing aid.
7. The hearing aid of claim 4 , wherein the antenna comprises a parallel loop antenna.
8. The hearing aid of claim 1 , wherein one or more dimensions of the notch are determined by balancing the capacitance resulting from the the crossover and a resistive loss resulting from the notch.
9. The hearing aid of claim 8 , wherein the feed-line conductor crosses the antenna conductor at a plurality of areas, and wherein at least one of the antenna conductor and the feedline conductor includes a notch in each area of the plurality of areas where the feed-line conductor crosses the antenna conductor.
10. A hearing aid, comprising,
an antenna housed in the hearing aid and including an antenna conductor;
a communication circuit housed in the hearing aid and configured to perform wireless communication using the antenna; and
a feed-line providing connections between the antenna and the communication circuit, the feed-line including a feed-line conductor crossing the antenna conductor to form a crossover resulting in a capacitance, the feed-line conductor including a notch positioned to reduce the capacitance by reducing an area of the crossover.
11. The hearing aid of claim 10 , wherein the hearing aid comprises a behind-the-ear (BTE) type hearing aid.
12. The hearing aid of claim 11 , wherein the antenna comprises a parallel loop antenna.
13. The hearing aid of claim 10 , wherein the antenna conductor comprises another notch in another area where the feed-line conductor crosses the antenna conductor.
14. A method for wireless communication with a hearing aid, comprising:
providing a hearing aid with an antenna including an antenna conductor;
providing the hearing aid with a communication circuit configured to perform the wireless communication using the antenna;
connecting the antenna to the communication circuit using a feed-line including a feedline conductor, the connection resulting in at least one crossover area where the feed-line conductor crosses the antenna conductor to result in a capacitance; and
forming a notch in at least one of the antenna conductor and the feed-line conductor in the crossover area to reduce the capacitance by reducing a size of the crossover area.
15. The method of claim 14 , comprising determining one or more dimensions of the notch is determined by balancing the capacitance resulting from the feed-line conductor crossing the antenna conductor and a resistive loss resulting from the notch.
16. The method of claim 15 , comprising forming the notch in the antenna conductor.
17. The method of claim 14 , comprising forming the notch in the feed-line conductor.
18. The method of claim 15 , wherein the connecting results in a plurality of crossover areas where the feed-line conductor crosses the antenna conductor, and further comprising forming notches in at least one of the antenna conductor or the feed-line conductor, the notches each formed in a crossover area of the plurality of crossover areas.
19. The method of claim 18 , comprising forming notches in the antenna conductor and the feed-line conductor.
20. The method of claim 14 , wherein providing the hearing aid with the antenna comprises providing a behind-the-ear (BTE) type hearing aid with a parallel loop antenna.