Patent Application
20110043415
1. Technical Field
The disclosure generally relates to antennas, particularly to a dual-band antenna and a wireless communication device using the dual-band antenna.
2. Description of Related Art
Antennas are important components of wireless communication devices such as mobile phones and personal digital assistants (PDAs) used for transmitting/receiving signals. Wireless communication devices usually need a dual-band or multi-band antenna to communicate at different frequency bands.
Referring to
Therefore, there is room for improvement within the art.
Many aspects of the dual-band antenna and wireless communication device can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the dual-band antenna and the wireless communication device.
Referring to
The radiating body 10 includes a first radiating portion 12 and a second radiating portion 14 connected to the first radiating portion 12. The first radiating portion 12 is an L-shaped sheet including a first band section 122 and a second band section 124 shorter than the first band section 122. The second band section 124 is perpendicularly connected to one end of the first band section 122. The second radiating portion 14 is also an L-shaped sheet including a connecting section 142 and an extending section 144. The connecting section 142 is perpendicularly connected to one end of the first band section 122, and parallel to the second band section 124. The extending section 144 is perpendicularly connected to the connecting section 142, and parallel to the first band section 122 with a space between them.
The grounding portion 20 and the feeding portion 30 are both strip-shaped sheet. One end of the grounding portion 20 is perpendicularly connected to the end of the first band section 122 opposite to the second band section 124. The feeding portion 30 is perpendicularly connected to one side of the first band section 122, and parallel to the grounding portion 20. A gap (not labeled) is defined between the grounding portion 20 and the feeding portion 30.
The baseboard 200 is a printed circuit board (PCB) in the wireless communication device 300 used to support and protect the dual-band antenna 100. The baseboard 200 includes a top surface 201, a first side surface 202, and a second side surface 203. The first side surface 202 and the second side surface 203 are perpendicularly extended from two adjacent edges of the top surface 201. The first side surface 202 is perpendicularly connected to the second side surface 203. A feeding point (not shown) and a grounding point (not shown) are set on the second side surface 203.
Referring to
During assembly, the radiating body 10 is mounted on the top surface 201 of the baseboard 200. The grounding portion 20 and the feeding portion 30 can be mounted on the side surface 203 of the baseboard 200, and respectively connected to the grounding point and feeding point thereon. In work, the dual-band antenna 100 receives the signals from the feed point via the feeding portion 30, and forms a first circuit path and a second circuit path having different electrical lengths. The first circuit path is from the feeding portion 30 to the first radiating portion 12. The second circuit path is from the feeding portion 30 to the second radiating portion 14. As is well known, signals at different frequencies have different wavelengths correspondingly. When the electrical lengths of the first circuit path and the second circuit path can be equal to ¼ of the wavelength of a signal, the corresponding first radiating portion 12 or the second radiating portion 14 can transmit and receive the corresponding signals.
In this exemplary embodiment, the length of the first circuit path can be approximately 29 mm, and the first radiating portion 12 receives/sends wireless signals at a first frequency band of 2.4˜2.5 GHz. The length of the second circuit path can be approximately 13 mm, and the second radiating portion 14 receives/sends wireless signals at a second frequency band of 5.4˜5.9 GHz. The dual-band antenna 100 can be suitable for operating in wireless local area network communication systems such as IEEE 802.11a/b/g/n.
Referring to
The outer dimensions of the dual-band antenna 100 is about 20 mm×3 mm×6 mm, and the dual-band antenna 100 does not occupy much space within wireless communication devices, which is advantageous to miniaturization of wireless communication devices. Furthermore, the dual-band antenna 100 provides two resonance frequencies via the first radiating portion 12 and the second radiating portion 14 suitable for two different communication systems, which reduces the cost of wireless communication device 300.
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 invention or sacrificing all of its material advantages, the examples hereinbefore described merely being preferred or exemplary embodiments of the invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 200910305716.1 | Aug 2009 | CN | national |
