Patent Grant
8471771
The present invention relates to an antenna, and more particularly to a dual-band antenna having a better effect for transmitting and receiving electro-magnetic signals.
Presently, in wireless communication field, demand of handheld electronic products dramatically increases day by day, and the handheld electronic products are developed according to trends of compactness. Most of traditional handheld electronic products can receive different electro-magnetic signals in two or more communication frequency bands. For allowing a handheld electronic product to receive electro-magnetic signals in a plurality of frequency bands, an internal antenna installed in the handheld electronic product is generally designed to have a considerable size and a plurality of radiation portions for receiving different frequency bands, in order to ensure that the handheld electronic product has a better receiving effect.
However, if it needs the internal antenna to receive electro-magnetic signals well in at least two frequency bands, the size of the antenna must be designed to be a considerable size. The development trend of compactness inevitably limits usable internal space in the handheld electronic product for receiving the internal antenna. Thus, the limited space in the handheld electronic product for receiving the internal antenna can not satisfy the need of providing a sufficient space for installing the internal antenna with the considerable size. If the handheld electronic product is designed to narrow the antenna receiving space to satisfy the compactness trend of the handheld electronic product, the receiving effect of the handheld electronic product will be inevitably lowered, and even can not normally work during communication.
A primary object of the present invention is to provide a dual-band antenna, which has a better effect for transmitting and receiving signals and thus can overcome the disadvantages existing in the conventional technologies, as described above.
To achieve the above object, the dual-band antenna provided by the present invention comprises a feed base portion, a low-frequency radiation portion and a high-frequency radiation portion. A first end of the feed base portion is bent and extended to form the low-frequency radiation portion which includes a first transverse portion transversely extended from the first end of the feed base portion, a first longitudinal portion longitudinally extended from a distal end of the first transverse portion, a second transverse portion extended from a distal end of the first longitudinal portion and substantially parallel to the first transverse portion along an identical direction thereof, a second longitudinal portion longitudinally extended from a distal end of the second transverse portion, substantially parallel to the first longitudinal portion and opposite to the first longitudinal portion, and a third transverse portion extended from a distal end of the second longitudinal portion, parallel to the first transverse portion and opposite to the first and second transverse portions. A second end of the feed base portion is bent and extended to form the high-frequency radiation portion which includes a third longitudinal portion longitudinally extended from the second end of the feed base portion, a fourth transverse portion transversely extended from a distal end of the third longitudinal portion and a fourth longitudinal portion extended upward from a distal end of the fourth transverse portion and substantially parallel to the third longitudinal portion. The feed base portion is further bent and extended to form a feed end.
As described above, the dual-band antenna of the present invention has an S-shape roundabout bent structure, so that the dual-band antenna has a better effect for transmitting and receiving electro-magnetic signals of two frequency bands of 900 MHz and 1800 MHz.
The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings. Furthermore, directional terms described by the present invention, such as upper, lower, front, back, left, right, inner, outer, side and etc., are only directions by referring to the accompanying drawings, and thus the used directional terms are used to describe and understand the present invention, but the present invention is not limited thereto.
A dual-band antenna according to the present invention is mainly applied to handheld electronic products, such as mobile phones.
Referring now to
Referring still to
A side edge of the feed base portion 2 is further bent and extended to form a feed end 21, wherein the feed end 21 is substantially hook-like and has an elastically-engaging feed portion 211 and a contact feed portion 212.
Referring to
When the dual-band antenna 100 according to the present invention is designed, the second longitudinal portion 14 of the low-frequency radiation portion 1 can be suitably widen according to actual desire, so as to provide a better effect of the dual-band antenna 100 for receiving the electro-magnetic signals of 900 MHz.
As described above, the dual-band antenna 100 according to the present invention has an S-shape roundabout bent structure, so that the dual-band antenna 100 has a better effect for transmitting and receiving electro-magnetic signals of two frequency bands of 900 MHz and 1800 MHz.
The present invention has been described with a preferred embodiment thereof and it is understood that many changes and modifications to the described embodiment can be carried out without departing from the scope and the spirit of the invention that is intended to be limited only by the appended claims.
| Number | Name | Date | Kind |
|---|---|---|---|
| 6166694 | Ying | Dec 2000 | A |
| 7417588 | Castany et al. | Aug 2008 | B2 |
| 8013796 | Liu et al. | Sep 2011 | B2 |
| Number | Date | Country | |
|---|---|---|---|
| 20120127059 A1 | May 2012 | US |
