1. Field of the Invention
The present invention relates generally to a monopole antenna, and more particularly to a monopole antenna being used in an electronic device.
2. Description of the Prior Art
With the development of wireless communication, compact structure antennas are popular to be used in electronic devices. Several conventional compact structure antennas include multiple parts, usually occupying rekatively space, while the electronic device has compact structure. Thus, reducing the number of parts of antenna can significantly reduce the cost and suitable for used in the electronic device. TW Pat. No. 239677 describes a wide band monopole antenna. The monopole antenna comprises a grouding portion, a radiating portion located above the grouding portion and a feeder line. The grouding portion is rectangular and includes an up edge, a low edge, a grouding point and a short point. The radiating portion includes a first metal patch, a second metal patch and a short metal arm. The feeder line includes a center conductor and an external conductor. But the occupied space of the monopole antenna is too large to be assembled in an interior space of the electronic devices with compact structure.
Referring now to
Hence, an improved antenna is desired to overcome the above-mentioned shortcomings of the existing antennas.
A primary object, therefore, of the present invention is to provide a monopole antenna with smaller size and wide bandwidth.
In order to implement the above object and overcomes the above-identified deficiencies in the prior art, the monopole antenna comprising: a planar base; a radiating element is long-guide trapezium-shaped and includes notch in the middle thereof; a grounding element locates on said planar base with a determined angle; a feeder line includes a center conductor connecting with said radiating element and a external conductor connecting with said grounding element.
Other objects, advantages and novel features of the invention will become more apparent from the following detailed description of a preferred embodiment when taken in conjunction with the accompanying drawings.
Reference will now be made in detail to a preferred embodiment of the present invention.
Referring to
The radiating element 20 of long-guide trapezium-shape comprises a trapezium-shaped notch 21 in the middle of the metal sheet which divides the antenna 1 into a first radiating arm 201 and a second radiating arm 202. Referring to
The grouding element 30 of rectangle-shaped is arranged substantially perpendicular to the planar substrate 10 and comprises a cutout 32 forming symmetrical rectangle-shaped grooves 31a, 31b on the both sides of the cutout in the middle thereof.
The feeder line 40 is a coaxial cable, and includes an inner conductor 41, an inner insulator 42 surrounding the inner conductor 41, a braid layer 43 surrounding the inner insulator 42, and an outer insulator 44 surrounding the braid layer 43. A front end of the inner insulator 42 is stripped to expose front end of the inner conductor 41. The inner conductor 41 is connected with the protruding portion 23 and the braid layer 43 extends through the cutout 32 to be connected with the grounding element 30.
The planar substrate 10 forms a pair of heaves 11a, 11b extending from the underside thereof. In assembly the heaves 11a, 11b respectively extend through the grooves 31a, 31b, so as to attach itself on the grouding element 30 firmly.
The data of the experiment of the monopole antenna 1 achieves enough band width. The monopole antenna 1 uses the special figure of trapezium with the notch 21 to improve its impedance matching. The monopole antenna 1 can gain enough band with.
While the foregoing description includes details which will enable those skilled in the art to practice the invention, it should be recognized that the description is illustrative in nature and that many modifications and variations thereof will be apparent to those skilled in the art having the benefit of these teachings. It is accordingly intended that the invention herein be defined solely by the claims appended hereto and that the claims be interpreted as broadly as permitted by the prior art.
Number | Date | Country | Kind |
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94141660 | Nov 2005 | TW | national |