Patent Grant
7652633
1. Field of the Invention
The present invention relates to an antenna for wireless network, and more particularly to an antenna for GPS.
2. Description of the Related Art
Along with the rapid development of wireless communication technology, various communication products emerge in quick succession. Thus, wireless communication products gradually become a part of people's life, and nearly all the new products have the function of wireless transmission to cater for the mass. As notebooks or mobile multimedia devices often need data transmission, and wireless transmission can simplify the wirings and settings, an antenna is required to achieve wireless transmission. In order to be widely accepted in the market, it is critical for notebooks or mobile multimedia devices with wireless transmission function to have preferred appearance, size, and performances, so it is more important to have a good antenna design and dispose the antenna at an appropriate position.
Conventional antennae for Global Positioning System (GPS) are ceramic circular polarization antennae for GPS, which have disadvantages that it cannot be customized and has a limited receiving angle. As current electronic devices are increasingly miniaturized, the inner space for accommodating other peripheral elements is limited. Thus, due to space limitation, the conventional circular polarization antennae for GPS are rather difficult to be applied to products (for example, notebook) with a small volume, so the application range is limited.
Moreover, as the electromagnetic field pattern of the conventional circular polarization antenna for GPS is right circularly polarized, the angle of receiving signals emitted by satellites is only limited to a range of about 15° above the conventional circular polarization antenna for GPS. Therefore, the conventional circular polarization antenna for GPS cannot receive signals from sides, which results in many dead angles.
Therefore, it is necessary to provide an antenna for GPS, so as to solve the above problems.
The present invention is to provide an antenna for GPS. The antenna comprises a ground metal plate, a parasitic metal plate, a radiation metal plate, and at least one supporting element. The parasitic metal plate is disposed above the ground metal plate and connects to the ground metal plate. The radiation metal plate is an independent metal plate and is disposed above the ground metal plate. The parasitic metal plate cooperates with the radiation metal plate to induce a resonance mode. The supporting element is disposed on the ground metal plate and is used to support the radiation metal plate.
The antenna for GPS provided by the present invention is a linear polarization antenna for GPS, which has the advantages that the antenna can be easily customized, applied to various wireless communication products, enhance the ability of receiving signal from sides, and broaden the receiving angle, thus solving the problem that the conventional circular polarization antenna for GPS cannot receive signals from sides and has many dead angles.
Referring to
The antenna 3 for GPS has at least one fixing portion for fixing the antenna 3 for GPS to the screen case frame 22. In this embodiment, the fixing portions are two through holes 35 (as shown in
Referring to
The ground metal plate 31 is disposed on a first side surface. The parasitic metal plate 32 is disposed above the ground metal plate 31 and connects to the ground metal plate 31. In the first embodiment, the parasitic metal plate 32 has a first portion 321 and a second portion 322. The first portion 321 is disposed on a second side surface, which is adjacent to the first side surface, and the second portion 322 is disposed on a third side surface, which is opposite to the first side surface. The first portion 321 of the parasitic metal plate 32 is connected to the ground metal plate 31.
The radiation metal plate 33 is an independent metal plate and is disposed above the ground metal plate 31. The parasitic metal plate 32 cooperates with the radiation metal plate 33 to induce a resonance mode, in which a frequency of the resonance mode is 1575 MHz. Though the cooperation of the parasitic metal plate 32 and the radiation metal plate 33, a zero electric potential is generated between the parasitic metal plate 32 and the radiation metal plate 33. Moreover, the wavelength excited by the parasitic metal plate 32 and the radiation metal plate 33 is a half wavelength, such that in an application of a frequency of 1575 MHz (the frequency of GPS), the parasitic metal plate 32 and the radiation metal plate 33 can have short length.
The radiation metal plate 33 has a first portion 331, a second portion 332, and a third portion 333. The first portion 331 is disposed on the second side surface, the second portion 332 is disposed on the third side surface, the third portion 333 is disposed on the second side surface. The second portion 322 of the parasitic metal plate 32 is located at a corresponding position above a first end of the ground metal plate 31, and extends towards the radiation metal plate 33. The third portion 333 of the radiation metal plate 33 is located at a corresponding position above a second end of the ground metal plate 31, and extends towards the parasitic metal plate 32. The second end is opposite to the first end. The supporting element 34 is disposed on the ground metal plate 31, and is used to support the radiation metal plate 33. Preferably, the supporting element 34 is an insulating element.
In the first embodiment, the supporting element 34 is a ceramic substrate having a first side surface 341, a second side surface 342, and a third side surface 343. The second side surface 342 is adjacent to the first side surface 341, and the third side surface 343 is opposite to the first side surface 341. The ground metal plate 31 is disposed on the first side surface 341 of the ceramic substrate. The first portion 321 of the parasitic metal plate 32 extends along a side of the ground metal plate 31, and is disposed on the second side surface 342 of the ceramic substrate. The second portion 322 of the parasitic metal plate 32 is disposed on the third side surface 343 of the ceramic substrate. The first portion 331 of the radiation metal plate 33 is disposed on the second side surface 342 of the ceramic substrate, the second portion 332 is disposed on the third side surface 343 of the ceramic substrate, and the third portion 333 is disposed on the second side surface 342 of the ceramic substrate. In other applications, the supporting element 34 can also be a non-conductive solid material.
Referring to
The parasitic metal plate 42 has a first portion 421 and a second portion 422. The first portion 421 of the parasitic metal plate 42 extends upward from a side of the ground metal plate 41 close to the first end 411. The second portion 422 of the parasitic metal plate 42 extends horizontally from the first portion 421 towards the second end 412 of the ground metal plate 41.
The radiation metal plate 43 has a first portion 431, a second portion 43, and a third portion 433. The first portion 431 of the radiation metal plate 43 is spaced by a distance from the side of the ground metal plate 41 close to the second end 412 and extends upward. The top of the first portion 431 of the radiation metal plate 43 and the top of the first portion 421 of the parasitic metal plate 42 are spaced by the same distance from the ground metal plate 41. The second portion 432 of the radiation metal plate 43 is disposed at the same level as the second portion 422 of the parasitic metal plate 42. The second portion 432 of the radiation metal plate 43 extends toward the first end 411 of the ground metal plate 41. The third portion 433 of the radiation metal plate 43 extends from the bottom of the second portion 432 towards the first end 411 of the ground metal plate 41 until between the ground metal plate 41 and the second portion 422 of the parasitic metal plate 42.
Next, the flexible PCB 44 is folded into a cuboid 44, so as to form the antenna 4 for GPS according to the second embodiment. Referring to
Referring to
It should be noted that, the supporting element 54 of the third embodiment can be a ceramic substrate or a non-conductive solid material. Or, the supporting element 54 of the third embodiment is a flexible PCB, and the ground metal plate 51, the parasitic metal plate 52, and the radiation metal plate 53 are respectively disposed on the flexible PCB. Then, the flexible PCB is folded into a cuboid antenna.
Referring to
Referring to
Moreover, the antenna 7 for GPS according to the fifth embodiment also has the following different structural aspects of element configuration. Relative to the ground metal plate 71, the second portion 722 of the parasitic metal plate 72 is at a level higher than that of the second portion 732 of the radiation metal plate 73, as shown in
It should be noted that, the supporting element 74 of the fifth embodiment can also be a flexible PCB. The ground metal plate 71, the parasitic metal plate 72, and the radiation metal plate 73 are respectively disposed on the flexible PCB. Then, the flexible PCB is folded into a cuboid antenna, as shown in
The antenna for GPS provided by the present invention is a linear polarization antenna for GPS, which has following advantages that the antenna can be easily customized, adapted for various wireless communication products, enhance the ability of receiving signal from sides, and broaden the receiving angle, thus solving the problem that the conventional circular polarization antenna for GPS cannot receive signals from sides and has many dead angles.
While several embodiments of the present invention have been illustrated and described, various modifications and improvements can be made by those skilled in the art. The embodiment of the present invention is therefore described in an illustrative, but not restrictive, sense. It is intended that the present invention may not be limited to the particular forms as illustrated, and that all modifications which maintain the spirit and scope of the present invention are within the scope as defined in the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 95149568 A | Dec 2006 | TW | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 4907006 | Nishikawa et al. | Mar 1990 | A |
| Number | Date | Country | |
|---|---|---|---|
| 20080158088 A1 | Jul 2008 | US |
