BACKGROUND OF THE INVENTION
1. Field of the Invention
The present disclosure relates to an antenna, and more particularly to a high isolation antenna.
2. Description of Related Art
With the development of technology, more and more portable electronic devices are equipped with wireless transceiver for transmitting wireless signals, so antenna is integrated therein. In order to meet the wireless signal transmission on different frequency band, the portable electronic equipment is often integrated with two or more antennas. However, with the miniaturization tendency of portable electronic devices, the internal space of the electronic device becomes smaller and smaller and the distance between two antennas becomes closer and closer. Thus the isolation therebetween becomes bad and can not meet the normal requirement of each antenna.
In view of the above, an improved antenna is desired to overcome the problems mentioned above.
SUMMARY OF THE INVENTION
Accordingly, an object of the present disclosure is to provide an antenna with high isolation.
According to one aspect of the present disclosure, an antenna with an isolating portion is provided. The antenna comprises a grounding portion extending in a longitudinal direction, a main body and an isolating portion extending from the grounding portion, a metal foil assembled on the grounding portion and a coaxial cable connecting the main body. The grounding portion comprises a first section and a second section connecting with each other. The main body extends from the first section while the isolating portion extends from the second section. The isolating portion locates beside the main body in the longitudinal direction and defines a gap therebetween.
Other objects, advantages and novel features of the disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an assembled, perspective view of an antenna in accordance with a preferred embodiment of the present disclosure;
FIG. 2 is an exploded, perspective view of the antenna shown in FIG. 1;
FIG. 3 is an isolation chart of the antenna shown in FIG. 1;
FIG. 4 is an isolation chart of an antenna without an isolating portion.
DETAILED DESCRIPTION OF THE INVENTION
Reference will now be made to the drawings to describe a preferred embodiment of the present disclosure in detail.
Referring to FIG. 1, an antenna 100 is stamped from a metal plate. The antenna 100 extends in a longitudinal direction/X-axis (see in FIG. 2), comprising a grounding portion 1 integrally extending in the longitudinal direction and defining two opposite ends (10a, 10b), a main body 2 and an isolating portion 3 integrally extending from the grounding portion 1 in a vertical direction/Y-axis (see in FIG. 2) perpendicular to the longitudinal direction, a coaxial 4 connecting the main body 2 and a metal foil 5 assembled on the grounding portion 1.
Referring to FIG. 2, the grounding portion 1 comprises a first section 11 and a second section 12 in the longitudinal direction. The main body 2 directly and integrally extends upwardly in the vertical direction from an upper edge of the first section 11 at a middle area 10c of the grounding portion 1 between said two opposite ends (10a, 10b). The main body 2 defines a continuous step structure which comprises an L-shaped/step structured connecting portion 21 and a radiating portion 22 integrally extending from the connecting portion 21. The radiating portion 22 firstly extends upwardly in the vertical direction to form a vertical section 22a, then extends in the longitudinal direction, and then extends in the vertical direction again, at last extending backwardly in the longitudinal direction. The connecting portion 21 and the radiating portion 22 define an opening 23 facing towards the isolating portion 3. The continuous step structure of the main body 2 cooperates with and extends away from the grounding portion 1 to define an L-shaped slot 24 therebetween. The antenna 100 further comprises a tab 13 extending upwardly from the first section 11 and into the L-shaped slot 24. The coaxial cable 4 comprises an inner conductor 41 soldering on the joint of the connecting portion 21 and the vertical section 22a of the radiating portion 22, and an outer conductor 42 surrounding the inner conductor 41 for soldering on the tab 13. The antenna 100 works at the frequency bands of 2.4-2.5 GHz and 5.15-5.85 GHz.
The isolating portion 3 directly and integrally extends from an upper edge of the second section 12. The isolating portion 3 defines a plurality of bends 31 and is substantially a rectangular frame with a cutout 30 (see in FIG. 1) facing opposite to the main body 2 in the longitudinal direction. The isolating portion 3 is coplanar with the main body 2 and defines a gap 203 cooperating with the main body 2. That is, the isolating portion 3 is located beside and spaced from the main body 2 in the longitudinal direction. The metal foil 5 connects the first section 11 of the grounding portion 1. The dimension of the metal foil 5 in the longitudinal direction is less than that of the grounding portion 1, i.e. at least partial of the grounding portion 1 is not covered by the metal foil 5 in the longitudinal direction. The frequency of the antenna 100 can be adjusted by changing the dimension of the metal foil 5 so that the antenna can be manufactured with a rough tolerance. In this embodiment, the metal foil 5 does not across the gap 203 in the longitudinal direction.
FIG. 3 shows the isolation chart of the present antenna 100. On the frequency band of 2.4-2.5 GHz, the isolation is less than −25 dB. Referring to point numbered 1, wherein the frequency is 2.4 GHz, the isolation is −28.9 dB; referring to point numbered 2, wherein the frequency is 2.5 GHz, the isolation is −29.5 dB. The antenna 100 of the present disclosure performs a high isolation. FIG. 4 is a comparison chart without the isolating portion. As the points numbered as 1′ and 2′ show, when the frequency band is 2.4-2.5 GHz, the isolation is about −23 dB, the isolation is bad.
While preferred embodiment in accordance with the present disclosure has been shown and described, equivalent modifications and changes known to persons skilled in the art according to the spirit of the present disclosure are considered within the scope of the present disclosure as defined in the appended claims.
Patent Grant
9806411
