Patent Application
20150077307
The subject matter herein generally relates to antenna structures, and particular to a multiband antenna structure and wireless communication device employing same.
With improvements in the integration of wireless communication systems, antennas have become increasingly important. For a wireless communication device to utilize various frequency bandwidths, antennas having wider bandwidths have become a significant technology.
Implementations of the present technology will now be described, by way of example only, with reference to the attached figures.
It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale and the proportions of certain parts have been exaggerated to better illustrate details and features of the present disclosure.
Several definitions that apply throughout this disclosure will now be presented.
The term “coupled” is defined as connected, whether directly or indirectly through intervening components, and is not necessarily limited to physical connections. The connection can be such that the objects are permanently connected or releasably connected. The term “comprising” when utilized, means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in the so-described combination, group, series and the like.
The first radiating body 23 and second radiating body 24 are metal sheets, and are parallel to each other. The printed circuit board 10 is parallel to the first and second radiating bodies 23 and 24, and is positioned between and apart from the first and second radiating bodies 23 and 24. In one embodiment, the first radiating body 23 is a portion of a front cover (not shown) of the wireless communication device 100, and is insulative from the remaining portion of the front cover of the wireless communication device 100. The second radiating body 24 is a portion of a back over of the wireless communication device 100, and is insulative from the remaining portion of the back cover of the wireless communication device 100.
The first coupling portion 25 and second coupling portion 26 are meander strips, and are positioned in a plane that is substantially perpendicular to a plane in which the first radiating body 23 is positioned. In particular, the first coupling portion 25 includes a first arm 251, a second arm 252 and a third arm 253 which are coupled sequentially. The first arm 251 is substantially perpendicularly coupled to an edge of the first radiating body 23. The second arm 252 is substantially U-shaped and positioned at a side of the first arm 251 facing the second coupling portion 26. The third arm 253 is substantially perpendicularly coupled to an edge of the second radiating body 24 facing the edge of first radiating body 23.
The second coupling portion 26 includes a first strip 261, a second strip 262, and a third strip 263 which are coupled sequentially. The first strip 261 is substantially perpendicularly coupled to the edge of the first radiating body 23. The second strip 262 is substantially U-shaped and positioned at a side of the first strip 261 facing the first coupling portion 25. The third strip 263 is substantially perpendicularly coupled to the edge of the second radiating body 24. In one embodiment, the second strip 262 aligns with the second arm 252.
The feeding portion 21 and the grounding portion 22 are substantially perpendicularly coupled to a same surface of the first radiating body 23.
In use, the loop antenna generates a low frequency resonate mode and a first high frequency resonant mode that is a harmonic of the low frequency resonate mode; the first and second coupling portions 25 and 26 generates a second high frequency resonate mode and a third high frequency resonate mode respectively.
By changing the capacitance value of the variable capacitor C, the operation frequency at low frequency band of the antenna structure 100 can be adjusted and the antenna characteristic can be improved. In one embodiment, the variable capacitor C can be a digital tuned capacitor that is an integrated circuit capacitor, such as a variable capacitor based on micro-electro-mechanical systems (MEMS) technology. In another embodiment, the variable capacitor C is a capacitance-variable diode of which the capacitance value can be changed by changing an applied voltage. In one embodiment, the capacitance value of the variable capacitor C can be set to either 2.3 pF or 7 pF.
Therefore, the antenna structure 20 can operate a low frequency band from about 704 MHz to about 960 MHz, and a high frequency band from about 1710 MHz to about 2170 MHz with an exceptional communication quality.
The embodiments shown and described above are only examples. Many details are often found in the art. Therefore, many such details are neither shown nor described. Even though numerous characteristics and advantages of the present technology have been set forth in the foregoing description, together with details of the structure and function of the present disclosure, the disclosure is illustrative only, and changes may be made in the detail, including in matters of shape, size and arrangement of the parts within the principles of the present disclosure up to, and including the full extent established by the broad general meaning of the terms used in the claims. It will therefore be appreciated that the embodiments described above may be modified within the scope of the claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2013104251042 | Sep 2013 | CN | national |
