1. FIELD OF THE INVENTION
The present invention relates to an antenna assembly, particularly relates to an antenna assembly for wireless data transmission.
2. DESCRIPTION OF THE PRIOR ART
With the development of electronic technology, more and more mobile electronic devices are equipped with wireless transceiver for wireless signal transmission. The antenna is often integrated in the electronic device. In the traditional technology, the antenna is integrated in the electronic device with screw or glue. However, with the miniaturization development trend of the electronic device, the internal space of the electronic device will become smaller and smaller, and the size of the antenna will become smaller and smaller. This increases the difficulty for installing the antenna to the electronic device and needs more time for assembling the antenna to the electronic device. It reduces the production efficiency of the electronic device.
It is desired to obtain an improved antenna assembly.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide an improved antenna assembly.
In order to achieve the object set forth, an antenna comprises a main body having a grounding portion, a cantilevered arm facing to the grounding portion, a first connecting portion and a second connecting portion. The first connecting portion connects the grounding portion and the cantilevered arm. The first connecting portion is located above the cantilevered arm and defines a first slot with the cantilevered arm. The second connecting portion connects the grounding portion and the cantilevered arm. The second connecting portion is located under the cantilevered arm and defines a second slot with the cantilevered arm. The cantilevered arm has a free end close to the grounding portion a signal feeding point thereon. the grounding portion having a grounding feeding point thereon; and a feeder cable connecting to the main body.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an assembled perspective view of an antenna assembly in accordance with the present invention;
FIG. 2 is an exploded perspective view of the antenna assembly of FIG. 1;
FIG. 3 is a further exploded perspective view of the antenna assembly of FIG. 2;
FIG. 4 is a further exploded perspective view of the antenna assembly of FIG. 3;
FIG. 5 is a front view of the first antenna of FIG. 4; and
FIG. 6 is a Voltage Standing Wave Ratio Chart of the antenna in accordance with the present invention.
DESCRIPTION OF PREFERRED EMBODIMENT
Reference will now be made to the drawings to describe the present invention in detail.
Referring to FIGS. 1-2, an antenna assembly includes a plurality of antennas 100, a metal shell 200, a plurality of speakers 300 and a plurality of screws 400. The antennas 100, the speakers 300 and the metal shell 200 are assembled together by the screws 400. In this embodiment, the metal shell 200 is a shell of a notebook.
The antennas 100 include a first antenna 110 and a second antenna 120. The first antenna 110 includes a first main body 111 and a first feeder cable 112 connecting to the first main body 111. The second antenna 120 includes a second main body 121 and a second feeder cable 122 connecting to the second main body 121. The structure of the first main body 111 is similar to the structure of the second main body 121, the first main body 111 and the second main body 121 are called the main body in the following description. Referring to FIGS. 3-4, the speakers 300 includes a first speaker 310 and a second speaker 320, the screws 400 include a first screw 410, a second screw 420, a third screw 430 and a fourth screw 440. The first antenna 110 and one end of the first speaker 310 are fixed to the metal shell 200 by the first screw 410, and the other end of the first speaker 310 is fixed to the metal shell 200 by the second screw 420. The second antenna 120 and one end of the second speaker 320 are fixed to the metal shell 200 by the third screw 430, and the other end of the second speaker 320 is fixed to the metal shell 200 by the fourth screw 440.
The first and second main bodies (111,121) shown in FIG. 1 to FIG. 4 are schematic diagrams. The detailed structure is shown in FIG. 5. Referring to FIG. 5, the main body (111,121) includes a grounding portion 103, a cantilevered arm or primary base 104 disposed by one side of the grounding portion 103, a first connecting portion 105 and a second connecting portion 106 connecting the grounding portion 103 with the cantilevered arm 104. The cantilevered arm 104 has a free end, the free end has a signal feeding point S. The grounding portion 103 has a grounding feeding point G. The first connecting portion 105 connects the grounding portion 103 with an upper portion of the cantilevered arm 104, and forms a first slot 101 between the cantilevered arm 104 and the first connecting portion 105. The second connecting portion 106 connects the grounding portion 103 with a lower portion of the cantilevered arm 104, and forms a second slot 102 between the cantilevered arm 104 and the second connecting portion 106. A length of the first slot 101 is larger than a length of the second slot 102. In this embodiment, the first slot 101 and the second slot 102 extend along a lengthwise direction while the third slot extends along a transverse direction perpendicular to said lengthwise direction. The free end of the cantilevered arm 104 is spaced from the grounding portion 103 with therebetween a third slot 107 which is connected to both the first slot 101 and the second slot 102. The feeder cable (112,122) includes an inner conductor 130 and a metallic weave 140 surrounding the inner conductor 130, the inner conductor 130 connects to the signal feeding point S, the metallic weave 140 connects to the grounding feeding point G. The grounding portion 103 is connected to the metal shell 200 by the first screw 410.
FIG. 6 is a Voltage Standing Wave Ratio Chart of the antenna 100 in accordance with the present invention. The main body (111,121) and the metal shell 200 are coupled and this controls the antenna 100 working in a 2.4 Ghz frequency band. The working frequency of the antenna 100 is more lower when the square of the main body (111,121) is more larger. The working frequency of the antenna 100 is more higher when the square of the main body (111,121) is more smaller. The antenna 100 can adjust the impedance by changing the length of the first slot 101, that is, the impedance of the antenna 100 and the characteristic impedance of the feeder cable can be in a matching state by adjusting the internal resistance of the main body. The antenna 100 adjusts the length of the second slot 102 to control the working frequency band in 5 Ghz. The working frequency of the antenna 100 is more lower when the length of the second slot 102 is more longer. The working frequency of the antenna 100 is more higher when the length of the second slot 102 is more shorter. In this embodiment, the antenna 100 is fixed in the speaker 300, and the antenna can also be fixed in a component having an insulative surface in other embodiments.
Although the present invention has been described with reference to particular embodiments, it is not to be construed as being limited thereto. Various alterations and modifications can be made to the embodiments without in any way departing from the scope or spirit of the present invention as defined in the appended claims.
Patent Grant
9917351
