This non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application No. 99128443 filed in Taiwan, R.O.C. on 2010 Aug. 25, the entire contents of which are hereby incorporated by reference.
1. Technical Field
The present invention relates to an antenna structure, and more particularly to an antenna structure capable of enhancing the radiation effect of the entire antenna.
2. Related Art
With the development of wireless communication technologies, many wireless communication devices, such as mobile phones, notebook computers, personal digital assistants (PDAs), GPS Satellite Navigation Systems, and E-book readers, have been developed. Aside from wireless communication functions, by replacing a conventional external antenna with an embedded antenna, the wireless communication devices can be built with an attractive, light, and thin industrial design while having a good quality of wireless communication.
However, in order to ensure an attractive design with accompanying sensation of quality, the housing of electric devices is expected to be made of metal, or be plated with a metal layer, influences the quality of wireless communication. Due to the shielding effect of metal, the delivery of electromagnetic waves is blocked, and antenna signal quality suffers.
Accordingly, the present invention is directed to an antenna structure so as to enhance the antenna gain and increase the bandwidth or provide multiple modes. The present invention is further directed to an antenna structure so as to enable an electronic device to have pleasing housing without reducing the gain of the antenna when being applied in the electronic device.
An antenna structure is provided, which includes: a substrate; a radiation unit, disposed on the substrate; and a metal plate, separated from the radiation unit for a distance and electrically isolated with the radiation unit. The metal plate is excited by the radiation unit to generate at least one resonance mode, and the metal plate includes a hole penetrating the metal plate.
An antenna structure is provided, which includes: a radiation unit; and a metal cover, including a concave surface and a convex surface. The concave surface faces the radiation unit. The metal cover is electrically isolated with the radiation unit and is excited by the radiation unit to generate at least one resonance mode. The metal cover includes a hole penetrating the concave surface and the convex surface.
Preferred embodiments and effects of the present invention are illustrated below with reference to the accompanying drawings.
The present invention will become more fully understood from the detailed description given below for illustration only, and thus not limitative of the present invention, wherein:
Hereafter embodiments are exemplified to illustrate the present invention in detail with reference to the accompanying drawings. For numbers mentioned in the specification, please make reference to the reference numbers in the drawings.
When the radiation unit 14 radiates electromagnetic wave signals, the metal plate 16 having the hole 162 couples the electromagnetic wave signals, and sends the electromagnetic wave signals with a radiation area larger than the radiation unit 14. Therefore, the gain of the radiation unit 14 is increased, and the quality of communication is improved. On the other hand, when receiving the electromagnetic wave signals, the metal plate 16 provides a larger area to receive the electromagnetic wave signals, and thus the quality of the signals are improved. The metal plate 16 couples the electromagnetic wave signals to the radiation unit 14 and converts the electromagnetic wave signals into electric signals. Here, the radiation unit 14 must be separated from the metal plate 16 for a distance d, so as to prevent the two being too far away from each other to couple the electromagnetic wave signals; or the two are too close to each other such that the radiated electromagnetic wave signals has a strength exceeding the official standard.
The shape of the hole 162 may be a geometrical shape, such as circle and square, and may also be an irregular shape, for example, be designed to a shape of a trademark. The hole 162 cannot be connected to edges of the metal plate 16, that is, the hole 162 must be a hole with closed surroundings. The hole 162 is projected orthogonally to the substrate 12 to form a projection part 164, and at least part of the projection part 164 is overlapped with the radiation unit 14. The radiation unit 14 is selected from a group consisting of a microstrip antenna, a slot antenna, a monopole antenna, a dipole antenna, a patch antenna, a loop antenna, and an array antenna.
Furthermore, the antenna structure 1 further includes a fixing member (not shown), which is connected to at least one of the substrate 12 and the metal plate 16, so as to maintain a distance between the metal plate 16 and the radiation unit 14. Here, the fixing member may be member for supporting and fixing the substrate 12 or the metal plate 16, such as, a support, a screw stud, and a screw thread. Moreover, when the antenna structure 1 is applied in an electronic device the metal plate 16 may be connected to a housing of the electronic device or become a part of the housing. The material of the metal plate 16 may be magnesium, aluminum, stainless steel, or an alloy thereof.
Compared with a single radiation unit 14, when the antenna structure 1 of the present invention is added with the metal plate 16, a capacity effect is generated between the radiation unit 14 and the metal plate 16, and a good resistance match is obtained. Therefore, at least one resonance mode is generated, and the resonance mode can provide a larger bandwidth and gain.
Here, the radiation unit 14 in
The metal cover 34 includes a concave surface 342 and a convex surface 344. The concave surface 342 faces the radiation unit 32. The metal cover 34 is electrically isolated with the radiation unit 32, and is excited by the radiation unit 32 in the manner of energy coupling, so as to generate at least one resonance mode. The metal cover 34 includes a hole 346 penetrating the concave surface 342 and the convex surface 344. The metal cover 34 cannot be fed with any electric signals or be grounded. Here, the material of the metal cover 34 may be magnesium, aluminum, stainless steel, or an alloy thereof. The shape of the metal cover 34 in
When the radiation unit 32 radiates the electromagnetic wave signals, the metal cover 34 with the hole 346 couples the electromagnetic wave signals, and sends the electromagnetic wave signals with a radiation area larger than the radiation unit 32. The gain of the radiation unit 32 is thus increased. On the other hand, when receiving the electromagnetic wave signals, the metal cover 34 provides a large area to receive the electromagnetic wave signals. Therefore, the quality of communication of the radiation unit 32 is improved by the metal cover 34. The metal cover 34 couples the electromagnetic wave signals to the radiation unit 32 and converts the electromagnetic wave signals into electric signals. Here, the radiation unit 32 must be separated from the hole 346 of the metal cover 34 for a distance, so as to prevent that the two are too far away from each other to couple the electromagnetic wave signals; or the two are too close to each other such that the radiated electromagnetic wave signals has a strength exceeding the official standard.
The shape of the hole 346 may be a geometrical shape, such as circle and square, and may also be an irregular shape, for example, be designed to a shape of a trademark. The hole 346 cannot be connected to edges of the metal plate 16, that is, the hole 346 must be a hole with closed surroundings. The hole 346 is projected orthogonally to the radiation unit 32 to form a projection part 348, and the projection part 348 is at least partially overlapped with the radiation unit 32.
In view of the above, according to the present invention, the communication capability of the antenna is actually improved with a metal plate having a hole or a metal cover, and the metal plate is applied in the housing of electronic devices to improve the degree of freedom in appearance design of electronic devices.
While the present invention has been described by the way of example and in terms of the preferred embodiments, it is to be understood that the invention need not to be limited to the disclosed embodiments. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims, the scope of which should be accorded the broadest interpretation so as to encompass all such modifications and similar structures.
Number | Date | Country | Kind |
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99128443 A | Aug 2010 | TW | national |
99216360 U | Aug 2010 | TW | national |
Number | Name | Date | Kind |
---|---|---|---|
5087920 | Tsurumaru et al. | Feb 1992 | A |
6552685 | Zhang | Apr 2003 | B2 |
6593891 | Zhang | Jul 2003 | B2 |
20040201531 | Fujimura et al. | Oct 2004 | A1 |
20050017914 | Huang | Jan 2005 | A1 |
20100141535 | Chen et al. | Jun 2010 | A1 |
Number | Date | Country |
---|---|---|
0 384 777 | Aug 1990 | EP |
0 891 004 | Jan 1999 | EP |
2-168703 | Jun 1990 | JP |
9-74312 | Mar 1997 | JP |
Number | Date | Country | |
---|---|---|---|
20120050123 A1 | Mar 2012 | US |