Patent Application
20130335287
1. Technical Field
The disclosure generally relates to antenna structures, and particularly to a hearing aid compatibility (HAC) compatible antenna module which has a radiation blocking member to reduce EMI (electromagnetic interference) to listening equipments such as hearing aids.
2. Description of Related Art
When a wireless communication device is close to a hearing aid while communicating with other devices, electromagnetic radiation of the wireless communication may cause interference with the hearing aid.
With respect to the above-mentioned problem of concomitant use between the wireless communication device and the hearing aid, the standardization of the United States group American National Standards Institute (ANSI) established compatibility between the wireless communication device and the hearing aid under “ANSI C63.19”. The ANSI C63.19 standards regularize the hearing aid compatibility test as follows:
A test probe is used to measure electromagnetic fields intensity of 5*5 cm about 15 mm above a sound hole of the wireless communication device. A test plane is divided into nine girds. Peak electromagnetic field intensity of the nine girds is used to define HAC levels. The HAC levels are defined as levels M1, M2, M3, and M4 having 5 db value difference among them. The characteristics of HAC are better when the level is higher. However, most wireless communication devices are difficult to achieve higher levels, and have larger interference to the hearing aids.
Therefore, there is room for improvement within the art.
Many aspects of the present disclosure can be better understood with reference to the following drawing. The components in the drawing are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the disclosure.
The antenna 10 includes a main radiating body 11, a feed end 12, a ground end 13. The feed end 12 and the ground end 13 are positioned at one side of the main radiating body 11.
The main radiating body 11 is a curved sheet including a substantially U-shaped first radiating portion 14, a second radiating portion 15, a third radiating portion 16, a first combining portion 17, a second combining portion 18 and a third combining portion 19.
The first radiating portion 14 includes a first end portion 141, an opposite second end portion 142, and a first connecting portion 143. A length of the first end portion 141 is substantially the same as a length of the second end portion 142. A width of the first end portion 141 is slightly narrower than a width of the second end portion 142. Two opposite ends of the first connecting portion 143 are respectively connected to the first end portion 141 and the second end portion 142. The first connecting portion 143 forms an opening 144 with the first end portion 141 and the second end portion 142.
The structure of the second radiating portion 15 is substantially similar to that of the first radiating portion 14. The second radiating portion 15 includes a third end portion 151, an opposite fourth end portion 152, and a second connecting portion 153. A length of the third end portion 151 is substantially the same as a length of the fourth end portion 152. A width of the third end portion 151 is slightly narrower than a width of the four end portion 152. Two opposite ends of the second connecting portion 153 are respectively connected to the third end portion 151 and the fourth end portion 152, and they form the substantially U-shaped second radiating portion 15. The second radiating portion 15 is positioned at one side of the first radiating portion 14 with the third end portion 151, the fourth end portion 152, and the second connecting portion 153 are respectively parallel to the first end portion 141, the second end portion 142, and the first connecting portion 151. The second radiating portion 15 is spaced from the first radiating portion 14. A substantially U-shaped first slot 30 is formed between the second radiating portion 15 and the first radiating portion 14.
The structure of the third radiating portion 16 is substantially similar to those of the first radiating portion 14 and the second radiating portion 15. The third radiating portion 16 includes a fifth end portion 161, an opposite sixth end portion 162, and a third connecting portion 163. A length and a width of the fifth end portion 161 are substantially the same as a length and a width of the sixth end portion 151. Two opposite ends of the third connecting portion 163 are respectively connected to the fifth end portion 161 and the sixth end portion 162, and they form the substantially U-shaped third radiating portion 16. The third radiating portion 16 is positioned at one side of the second radiating portion 15 with the fifth end portion 161, the sixth end portion 162, and the third connecting portion 163 are respectively parallel to the third end portion 151, the fourth end portion 152, and the second connecting portion 153. The third radiating portion 16 is spaced from the second radiating portion 15. A substantially U-shaped second slot 40 is formed between the third radiating portion 16 and the second radiating portion 15.
The first, second and third combining portions 17, 18, 19 are substantially strip-shaped. Two opposite ends of first combining portion 17 are respectively connected to the first end portion 141 and the third end portion 151 to interconnect the first radiating portion 14 and the second radiating portion 15. Two opposite ends of second combining portion 18 are respectively connected to the third end portion 151 and the fifth end portion 161 and two opposite ends of third combining portion 19 are respectively connected to the fourth end portion 152 and the sixth end portion 162. The second radiating portion 15 and the third radiating portion 16 are interconnected by the second combining portion 18 and the third combing portion 19.
The feed end 12 and the ground end 13 are substantially strip-shaped. The feed end 12 and the ground end 13 are positioned in a plane perpendicular to the first, second, and third radiating portions 14, 15, and 16. The feed end 12 is extended from an end of the third end portion 151. The ground end is extended from an end of the fifth end portion 161.
The radiation blocking member 20 is a substantially L-shaped sheet including a first curved portion 21 and a second curved portion 22, perpendicularly connected to the first curved portion 21. The radiation blocking member 20 is positioned at one side of the antenna 10 aligning with the opening 144. The first curved portion 21 is coplanar with the first radiating portion 14. The second curved portion 22 is coplanar with the ground end 13 and the feed end 12. The radiation blocking member 20 may be positioned in the wireless communication device adjacent to an audio receiver. When the hearing aid is inserted into the wireless communication device, the radiation blocking member 20 blocks the portion radiation of the antenna 10 toward the audio receiver.
Referring to
It is believed that the exemplary embodiments and their advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the spirit and scope of the disclosure or sacrificing all of its material advantages, the examples hereinbefore described merely being preferred or exemplary embodiments of the disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201210200774X | Jun 2012 | CN | national |
