Patent Grant
8552919
1. Field of the Invention
The present invention relates to an antenna module, and in particular relates to a Penta-band antenna module.
2. Description of the Related Art
Nowadays, mobile devices require multi-mode and multi-band communication functions, and need to transmit wireless signals of frequency bands such as GSM850/900/1800/1900/UMTS (Penta-band), where GSM and UMTS are the abbreviations of Global System for Mobile Communications and the Universal Mobile Telecommunications System, respectively.
Conventionally, a dielectric antenna module is utilized to transmit wireless signals of frequency bands such as GSM850/900/1800/1900/UMTS (Penta-band). A conventional dielectric antenna module includes a Planar Inverted F Antenna (PIFA) radiator and a dielectric radiator. The PIFA radiator is utilized to transmit wireless signals of frequency bands such as GSM800/900, and the dielectric radiator is utilized to transmit wireless signals of frequency bands such as GSM1800/1900/2100. A conventional dielectric antenna module is expensive, causing the increased cost of a mobile device.
An antenna module is provided. The antenna module includes a radiator, a feed pin, a ground element, a first parasitic arm, a second parasitic arm and an impedance matching unit. The radiator includes a first section and a second section, wherein an end of the first section is connected to the second section, and the first section is perpendicular to the second section. The feed pin is connected to another end of the first section. The first parasitic arm is parallel to the second section, wherein an end of first parasitic arm is connected to the ground element, and the first parasitic arm couples with the second section of the radiator. The impedance matching unit is connected to the second section and the ground element. The second parasitic arm is partially parallel to the first section, and the second parasitic arm couples with the first section of the radiator, and an end of the second parasitic arm is connected to the ground element.
In the embodiment of the invention, four ground points are utilized to improve impedance matching effect. The first parasitic arm couples with the second section of the radiator to increase wideband coverage of the antenna module to 850 GHz. The second parasitic arm couples with the first section of the radiator to increase wideband coverage of the antenna module to 1900 MHz and 2100 MHz. The length of the first parasitic arm is shorter than a quarter of the wavelength of the signal at 850 GHz. The impedance matching unit improves impedance matching effect, and increases bandwidth of the antenna module at high frequency bands (1900 MHz to 2100 MHz). The first parasitic arm, the second parasitic arm and impedance matching unit generate inductance and capacitance effect to offset reactance and to increase impedance bandwidth. The antenna module of the embodiment of the invention provides a Penta-band coverage (GSM850/900/1800/1900/UMTS). The antenna module of the embodiment of the invention is provided at a low cost (about USD 0.2), and with a wide bandwidth, good impedance matching and high efficiency.
A detailed description is given in the following embodiments with reference to the accompanying drawings.
The present invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:
The following description is of the best-contemplated mode of carrying out the invention. This description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims.
In this embodiment, the ground element 130 is planar, and the ground element 130 comprises a first side 131 and a second side 132, and the first side 131 is perpendicular to the second side 132, and the first parasitic arm 140 is extended from the first side 131.
In this embodiment, the first parasitic arm 140 is longitudinal. At least portion of the second section 112 of the radiator 110 is located between the first section 111 of the radiator 110 and the first parasitic arm 140. In the first embodiment, the length of the second section 112 of the radiator 110 is about a quarter of the wavelength of the signal at, for example, 850 MHz. The first parasitic arm 140 couples with the second section 112 of the radiator 110 to increase wideband coverage of the antenna module to, for example, 850 MHz. The length of the first parasitic arm 140 is shorter than a quarter of the wavelength of the signal at, for example, 850 MHz.
In this embodiment, the ground element 130 is planar, and the ground element 130 comprises a first side 131 and a second side 132, and the first side 131 is perpendicular to the second side 132, and the first parasitic arm 140 is extended from the first side 131, and the second parasitic arm 150 is extended from the second side 132.
In this embodiment, the first parasitic arm 140 is longitudinal. The second parasitic arm 150 comprises a first parasitic section 151 and a second parasitic section 152, and the first parasitic section 151 is connected to the second parasitic section 152, an end of the first parasitic section 151 is connected to the ground element 130, and the first parasitic section 151 is parallel and adjacent to the first section 111 of the radiator 110, and the second parasitic section 152 is partially parallel to the second section 112 of the radiator 110. In this embodiment, the first parasitic section 151 is longitudinal, and the second parasitic section 152 is L shaped.
In this embodiment, at least portion of the second section 112 of the radiator 110 is located between the first section 111 of the radiator 110 and the first parasitic arm 140, and at least portion of the second section 112 of the radiator 110 is located between the first parasitic arm 140 and the second parasitic arm 150. The first parasitic arm 140 and the second parasitic arm 150 may be utilized separately. The location of the first parasitic arm 140 and the second parasitic arm 150 disclosed above does not restrict the invention.
In the second embodiment, the first parasitic arm 140 couples with the second section 112 of the radiator 110 to increase wideband coverage of the antenna module to, for example, 850 MHz (low band). The second parasitic arm 150 couples with the first section 111 of the radiator 110 to increase wideband coverage of the antenna module to, for example, 1900 MHz and 2100 MHz (high band). The length of the first parasitic arm 140 is shorter than a quarter of the wavelength of the signal at, for example, 850 MHz.
The impedance matching unit 160 comprises a first matching section 161, a second matching section 162 and a third matching section 163, and the first matching section 161 is connected to the second section 112 of the radiator 110, and the second matching section 162 is connected to the first matching section 161 and the ground element 130, and the third matching section 163 is connected to the first matching section 161 and the ground element 130. The second matching section 162 and the third matching section 163 are connected to the ground element 130 on ground points 124 and 125, respectively.
The first matching section 161 may be L shaped, and any of the second matching section 162 and the third matching section 163 may be longitudinal, L shaped, zigzag shaped or a similar but different shape.
More specifically, the second section 112 of the radiator comprises a first portion 113, a second portion 114 and a third portion 115, and the first portion 113 is connected to the first section 111, and the second portion 114 is connected and perpendicular to the first portion 113, and the third portion 115 is connected and perpendicular to the second portion 114, and the third portion 115 extends toward the third matching section 163. The third portion 115 couples with the third matching section 163. In this embodiment, the third portion 115 comprises a free end 116, and the free end couples with the third matching section 163.
In the third embodiment, the impedance matching unit 160 improves impedance matching effect, and increases bandwidth of the antenna module at high frequency bands (e.g. 1900 MHz to 2100 MHz).
The impedance matching unit 160 comprises a first matching section 161, a second matching section 162 and a third matching section 163, and the first matching section 161 is connected to the second section 112 of the radiator 110, and the second matching section 162 is connected to the first matching section 161 and the ground element 130, and the third matching section 163 is connected to the first matching section 161 and the ground element 130. The second matching section 162 and the third matching section 163 are connected to the ground element 130 on ground points 124 and 125, respectively.
The second section 112 of the radiator comprises a first portion 113, a second portion 114 and a third portion 115, and the first portion 113 is connected to the first section 111, and the second portion 114 is connected and perpendicular to the first portion 113, and the third portion 115 is connected and perpendicular to the second portion 114, and the third portion 115 extends toward the third matching section 163. The third portion 115 couples with the third matching section 163. In this embodiment, the third portion 115 comprises a free end 116, and the free end couples with the third matching section 163.
In this embodiment, the ground element 130 is planar, and the ground element 130 comprises a first side 131 and a second side 132, and the first side 131 is perpendicular to the second side 132, and the first parasitic arm 140 is extended from the first side 131, and the second parasitic arm 150 is extended from the second side 132.
In this embodiment, the first parasitic arm 140 is longitudinal. The second parasitic arm 150 comprises a first parasitic section 151 and a second parasitic section 152, and the first parasitic section 151 is connected to the second parasitic section 152, an end of the first parasitic section 151 is connected to the ground element 130, and the first parasitic section 151 is parallel and adjacent to the first section 111 of the radiator 110, and the second parasitic section 152 is partially parallel to the second section 112 of the radiator 110. In this embodiment, the first parasitic section 151 is longitudinal, and the second parasitic section 152 is L shaped.
In this embodiment, at least portion of the second section 112 of the radiator 110 is located between the first section 111 of the radiator 110 and the first parasitic arm 140, and at least portion of the second section 112 of the radiator 110 is located between the first parasitic arm 140 and the second parasitic arm 150. The first parasitic arm 140 and the second parasitic arm 150 may be utilized separately. The location of the first parasitic arm 140 and the second parasitic arm 150 disclosed above does not restrict the invention.
In the fourth embodiment, four ground points 122 to 125 are utilized to improve impedance matching effect. The first parasitic arm 140 couples with the second section 112 of the radiator 110 to increase wideband coverage of the antenna module to, for example, 850 MHz. The second parasitic arm 150 couples with the first section 111 of the radiator 110 to increase wideband coverage of the antenna module to, for example, 1900 MHz and 2100 MHz. The length of the first parasitic arm 140 is shorter than a quarter of the wavelength of the signal at, for example, 850 MHz. The impedance matching unit 160 improves impedance matching effect, and increases bandwidth of the antenna module at high frequency bands (e.g. 1900 MHz to 2100 MHz). The first parasitic arm 140, the second parasitic arm 150 and impedance matching unit 160 generate inductance and capacitance effect to offset reactance and increase impedance bandwidth.
Use of ordinal terms such as “first”, “second”, “third”, etc., in the claims to modify a claim element does not by itself connote any priority, precedence, or order of one claim element over another or the temporal order in which acts of a method are performed, but are used merely as labels to distinguish one claim element having a certain name from another element having a same name (but for use of the ordinal term) to distinguish the claim elements.
While the invention has been described by way of example and in terms of the preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.
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| Entry |
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| English language translation of abstract of WO 2011/024280 (published Mar. 3, 2011). |
| Number | Date | Country | |
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| 20120242555 A1 | Sep 2012 | US |
