Patent Application
20110018781
1. Field of the Invention
The invention relates to an ultra-wideband antenna, and particularly to an ultra-wideband antenna with a compact structure capable of covering multiple frequency bands.
2. The Related Art
Ultra-wideband (UWB) is a radio technology that can be used at very low energy levels for short-range high-bandwidth communications by using a large portion of the radio spectrum. With the development of wireless communication, more and more portable electronic devices are generally equipped with the ultra-wideband antennas for supporting wireless communication in multiple operating frequency bands. However, the conventional ultra-wideband antenna generally has a big size for meeting a requirement of multiple frequency bands, which is against miniaturization trend of the portable electronic device. So it is necessary to design an ultra-wideband antenna with a simple and compact structure capable of covering multiple frequency bands in the world.
An object of the present invention is to provide an ultra-wideband antenna with a compact structure capable of covering multiple frequency bands.
The ultra-wideband antenna has an elongated grounding plate disposed horizontally. The grounding plate defines a long front edge thereon. A connecting portion is extended upwards from an end of the front edge of the grounding plate. A first antenna radiator has a first radiating strip, which is extended from a side of the connecting portion along an extending direction of the front edge of the grounding plate and spaced apart from the grounding plate, and a second radiating strip extended opposite to the first radiating strip and upwards from a free end of the first radiating strip, with a free end thereof flushing with an end of the grounding plate. A feeding point is arranged on the second radiating strip of the first antenna radiator and adjacent to the first radiating strip. A second antenna radiator includes a third radiating strip suspended over and substantially parallel with the grounding plate, with one end of a long front edge thereof connected with a free end of the connecting portion, a fourth radiating strip connecting with the other end of the long front edge of the third radiating strip and an upper side of the second radiating strip, and a fifth radiating strip extended downwards from the long front edge of the third radiating strip. The fifth radiating strip connects with the connecting portion and spaces apart from the first radiating strip. A third antenna radiator connects with a substantially middle portion of the long front edge of the third radiating strip and an upper side of the first radiating strip.
As described above, the ultra-wideband antenna has a simple and compact structure, which suits the miniaturization development of the portable electronic device and reduces the manufacture cost. Meanwhile, the ultra-wideband antenna has excellent and improvable performances in frequency bands ranging from 3.1 to 4.9 GHz, 4.9 to 6.3 GHz and 6.3 to 8.0 GHz.
The present invention will be apparent to those skilled in the art by reading the following description of an embodiment thereof, with reference to the attached drawings, in which:
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The first antenna radiator 2 has a first radiating strip 21, which is extended from a side of the connecting portion 5 along an extending direction of the front edge 11 of the grounding plate 1 and spaced apart from the grounding plate 1, and a second radiating strip 22, which is extended opposite to the first radiating strip 21 and upwards from a free end of the first radiating strip 21, with a free end thereof flushing with an end of the grounding plate 1. The feeding point 6 is arranged on the second radiating strip 22 and adjacent to the first radiating strip 21.
The second antenna radiator 3 includes an elongated third radiating strip 31 suspended over and substantially parallel with the grounding plate 1, with one end of a long front edge 311 thereof connected with a free end of the connecting portion 5, a fourth radiating strip 32 which is extended downwards from the other end of the long front edge 311 of the third radiating strip 31 and connects with an upper side of the second radiating strip 22, and a fifth radiating strip 33 extended downwards from the long front edge 311 of the third radiating strip 31, which connects with the connecting portion 5 and is spaced apart from the first radiating strip 21 with a predetermined distance. In this embodiment, the third radiating strip 31 is shorter than the grounding plate 1 in length. The fourth radiating strip 32 connects with an end of the upper side of the second radiating strip 22 adjacent to the first radiating strip 21. The long front edge 311 of the third radiating strip 31 has a substantial middle portion extended downwards to form the third antenna radiator 4, with a free end thereof connecting with an upper side of the first radiating strip 21. A rear edge of the third radiating strip 31 opposite to the long front edge 311 has an end extended downwards to form a third fixing portion 34, substantially facing to the fifth radiating strip 33, for mating with the electronic device. In this embodiment, the grounding plate 1, the third radiating strip 31, the fourth radiating strip 32 and the fifth radiating strip 33 are punched with fixing holes 15 thereon, for fixing the ultra-wideband antenna 100 on the electronic device firmly.
When the ultra-wideband antenna 100 operates at a wireless communication environment, a current is fed from the feeding point 6 to the first antenna radiator 2 to generate an electronic resonance corresponding to frequency band ranging between 6.3 GHz and 8.0 GHz. While the current is fed from the feeding point 6 to the second antenna radiator 3 to generate an electronic resonance corresponding to frequency band ranging between 3.1 GHz and 4.9 GHz. While the current is fed from the feeding point 6 to the third antenna radiator 4 to generate an electronic resonance corresponding to frequency band ranging between 4.9 GHz and 6.3 GHz.
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As described above, the ultra-wideband antenna 100 has a simple and compact structure, which suits the miniaturization development of the portable electronic device and reduces the manufacture cost. Meanwhile, the ultra-wideband antenna 100 has excellent and improvable performances in frequency bands ranging from 3.1 to 4.9 GHz, 4.9 to 6.3 GHz and 6.3 to 8.0 GHz.
Furthermore, the present invention is not limited to the embodiment described above; various additions, alterations and the like may be made within the scope of the present invention by a person skilled in the art. For example, respective embodiments may be appropriately combined.
