Patent Application
20140313097
1. Technical Field
The disclosure generally relates to antennas, and particularly to a global positioning system (GPS) antenna, a motherboard employing the GPS antenna, and a wireless communication device employing the motherboard.
2. Description of Related Art
A typical GPS antenna is a planar inverted-F antenna or a panel antenna. However, the planar inverted-F antenna and the panel antenna are usually large, which compromise efforts toward miniaturization of portable electronic devices.
Therefore, there is room for improvement within the art.
Many aspects of the embodiments can be better understood with reference to the drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the disclosure.
The GPS antenna 20 includes a resonating member 21, a grounding portion 24, and a feeding portion 25. The resonating member 21 is electronically connected to and grounded by the grounding portion 24. The resonating member 21 is further electronically connected to a signal feeding point (not shown) of the motherboard 100 via the feeding portion 25.
The resonating member 21 includes a radiation body 210, and defines a first slit 22 and a second slit 23. The radiation body 210 includes a first radiating portion 211, a second radiating portion 213, and a third radiating portion 215. The first radiating portion 211 is rectangular-frame-shaped. The second and the third radiating portions 213, 215 are strip-shaped. The second radiating portion 213 and the third radiating portion 215 are substantially parallel to each other and extend from a same side of the first radiating portion 211. The second radiating portion 213 is longer than the third radiating portion 215. The first, second, and third radiating portions 211, 213, and 215 cooperatively define a first slit 22. A second slit 23 is defined in a center portion of the first radiating portion 211.
The grounding portion 24 and the feeding portion 25 extend from the third radiating portion 215 away from the second radiating portion 213. The grounding portion 24 extends from a distal end of the third radiating portion 215. The feeding portion 25 is substantially parallel to the grounding portion 24 and extends from a middle portion of the third radiating portion 215. A shape and size of the first slit 22 and the second slit 23 can be adjusted to ensure that the GPS antenna 20 receives/transmits wireless signals at a central frequency of about 1575 megahertz (MHz).
In use, current transmitted to a portion of the radiation body 210 adjacent to the first slit 22 and the second slit 23 is enhanced, such that an electromagnetic field distribution of the resonating member 21 is adjusted, and an electromagnetic field power of the resonating member 21 is enhanced. The adjusted electromagnetic field distribution and the enhanced electromagnetic field power broaden a bandwidth of the GPS antenna 20. In addition, the presence of the first slit 22 and the second slit 23 increase a length of a current path of the radiation body 210. Thus, a size of the GPS antenna 20 is decreased.
The GPS antenna 20 is a copper foil directly formed by etching on the PCB 10, thus reducing a required size of the GPS antenna 20. In addition, the current path of the radiation body 210 is increased by the first and second slits 22 and 23, thereby further reducing the required size of the GPS antenna 20. Therefore, the disclosure provides a GPS antenna to facilitate miniaturization of motherboards and wireless communication devices.
It is believed that the 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 embodiments of the disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102114287 | Apr 2013 | TW | national |
