BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1A is a structural drawing of a prior art antenna.
FIG. 1B shows different efficiencies of the prior art antenna shown in FIG. 1A at different frequencies.
FIG. 2A is a perspective drawing of a multi-frequency antenna of an embodiment of the present invention.
FIG. 2B is a front view drawing of the multi-frequency antenna shown in FIG. 2A.
FIG. 2C shows different efficiencies of the multi-frequency antenna shown in FIG. 2A at different frequencies.
FIG. 3 is a schematic drawing showing the multi-frequency antenna being installed on the mobile device.
FIG. 4A is a schematic drawing showing a combination of the multi-frequency antenna and a frame.
FIG. 4B is a perspective drawing of the combination of the multi-frequency antenna and the frame shown in FIG. 4A.
FIG. 4C is a front view drawing of the combination of the multi-frequency antenna and the frame shown in FIG. 4A.
FIG. 5 is a system functional block drawing of the mobile device of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Following description provides an embodiment of a multi-frequency antenna and an embodiment of the multi-frequency antenna being installed in a mobile device with related drawings.
Please refer to FIG. 2A and FIG. 2B. FIG. 2A is a perspective drawing of a multi-frequency antenna of an embodiment of the present invention. FIG. 2B is a front view drawing of the multi-frequency antenna shown in FIG. 2A.
As shown in FIG. 2 and FIG. 2B, a multi-frequency antenna 10 comprises a radiating element 21, a grounding element 22 and a connecting element 23. The connecting element 23 comprises a first end 231 and a second end 232. The grounding element 22 comprises a first plane 221, a second plane 222 and a third plane 223, and the third plane 223 separately and perpendicularly adjoins the first plane 221 and the second plane 222 so the grounding element 22 substantially has a U-shape structure. The radiating element 21 may be a metal plate with a long stripe shape, when the currents are feeding, the radiating element 21 excite the radiation energy via the currents.
As shown in FIG. 2A and FIG. 2B, the first end 231 of the connecting element 23 is electrically connected to the radiating element 21, and the second end 232 of the connecting element 23 is electrically connected to the first plane 221 of the grounding element 22. Furthermore, the first end 231 and the radiating element 21 perpendicularly adjoin each other; the second end 232 and the first plane 221 also perpendicularly adjoin each other, so the multi-frequency antenna 10 forms a three-dimensional structure to reduce its volume. The connecting element 23 comprises a feeding point 233, which is slightly protruded from the first end 231 of the connecting element 23. With the feeding point 233, a feeding wire (not shown) is electrically connected to the feeding point 233 for feeding currents, and the radiating element 21 can excite the radiation energy via the currents, for example, receiving or transmitting wireless signals with 2.4 GHz and 5 GHz frequencies.
In one embodiment of the present invention, the radiating element 21 has at least one flute 211 for increasing its radiation efficiency. For example, the flute 211 can be disposed on the edge of the radiating element 21. Moreover, flute 211 disposed on the radiating element 21 is used for changing the current distribution on the radiating element 21 and further for increasing inductance to enhance the radiation efficiency of the multi-frequency antenna 10. Furthermore, the present invention utilizes the width of the radiating element 21 to increase the frequency band of the multi-frequency antenna 10. In addition, the multi-frequency antenna 10 can be made of metal with good electric conductivity, such as copper alloy.
Please refer to FIG. 2C. FIG. 2C shows different efficiencies of the multi-frequency antenna 10 shown in FIG. 2A at different frequencies. According to FIG. 2C, the multi-frequency antenna 10 has an efficiency about 60% at low frequencies 2.4 GHz˜2.5 GHz and has an efficiency about 55% at high frequencies 5.15 GHz˜5.85 GHz. Comparing with the prior art antenna 90 shown in FIG. 1B, the efficiency of the multi-frequency antenna 10 is much higher than the efficiency of the multi-frequency antenna 90.
In addition, on the multi-frequency antenna 10, a first U-shaped portion 32a and a second U-shaped portion 32b can be perpendicularly disposed on the first plane 221 and used for fixing the feeding wire or other cables or other purposes.
Furthermore, the U-shaped structure of the grounding element 22 can have an opening 224, and the opening 224 can be used for enabling the multi-frequency antenna 10 to be hanged on the frame of the mobile device. Moreover, the first plane 221 comprises a plurality of concaves 31, and the plurality of concaves 31 can help the multi-frequency antenna 10 to be fastened on the mobile device (another following embodiment will provide more detail).
The present invention also provides a mobile device with the multi-frequency antenna 10, for transmitting and receiving wireless signals. Please refer to FIG. 3, FIG. 4A to FIG. 4C.
In the following embodiment, a mobile device 40 is a notebook computer; however, the mobile device 40 can also be a mobile phone or a personal digital assistant (PDA), or other similar device.
As shown in FIG. 3, the mobile device 40 comprises a frame 41, and the multi-frequency antenna 10 is installed on the frame 41 of the mobile device 40. The multi-frequency antenna 10 can be installed at different position on the frame 41.
FIG. 4A is a schematic drawing showing a combination of the multi-frequency antenna and a frame. As shown in FIG. 4A (please also refer FIG. 2A), the multi-frequency antenna 10 is fixed on the frame 41 via the grounding element 22. Since the first plane 221, the second plane 222 and the third plane 223 of the grounding element 22 forms a U-shaped structure, and the U-shaped structure has the opening 224, the frame 41 can be inserted in the opening 224 to hang the multi-frequency antenna 10 on the frame 41. Furthermore, the first plane 221 has a plurality of concaves 31, and the frame 41 has a plurality of corresponding connecting areas 42, so the first plane 221 of the multi-frequency antenna 10 can be fastened with the frame 41 of the mobile device 40. FIG. 4B is a perspective drawing of the combination of the multi-frequency antenna and the frame shown in FIG. 4A. FIG. 4C is a front view drawing of the combination of the multi-frequency antenna and the frame shown in FIG. 4A. With the above mentioned mechanism, the present invention needs no screws or other fastening elements, which can reduce manufacturing cost.
Finally, please refer to FIG. 5. FIG. 5 is a system functional block drawing of the mobile device of the present invention. As shown in FIG. 5, when the multi-frequency antenna 10 is installed on the frame 41, a feeding wire is electrically connected to the multi-frequency antenna 10 (for example, for feeding currents to the feeding point 233) and a wireless signal module 51, to utilize the wireless signal module 51 to process signals from the multi-frequency antenna 10. Therefore, the mobile device 40 can receive or transmit wireless signals via the multi-frequency antenna 10 (not shown) to achieve wireless communication.
Although the present invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed.
Patent Application
20080001839
