CN101997162A

CN101997162A - Multi-frequency antenna

Info

Publication number: CN101997162A
Application number: CN2009103060041A
Authority: CN
Inventors: 曾宪圣; 陈尚仁
Original assignee: Foxconn Kunshan Computer Connector Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Foxconn Kunshan Computer Connector Co Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2009-08-25
Filing date: 2009-08-25
Publication date: 2011-03-30

Abstract

The invention provides a multi-frequency antenna which comprises a grounding metal sheet provided with an edge and a grounding point, a first radiation metal arm, a second radiation metal arm, a third radiation metal arm and a feed-in coaxial transmission line for signal transmission, wherein, the first radiation metal arm is an L-shaped metal sheet positioned above the grounding metal sheet and comprises a feed-in point; the second radiation metal arm is an L-shaped metal sheet positioned above the first radiation metal arm and operates at a first operating frequency band; the third radiation metal arm is a rectangular metal sheet parallel to the edge and operates at a second operating frequency band; the feed-in coaxial transmission line comprises a central lead connected to the feed-in point and an external-layer grounding conductor connected to the grounding point; and the feed-in point, the first radiation metal arm, the grounding metal sheet and the grounding point are jointly formed in a first slot which operates at a third operating frequency band. The multi-frequency antenna has the advantages of simple structure, small occupied internal space of electronic equipment and convenient manufacturing.

Description

Multifrequency antenna

[technical field]

The present invention relates to a kind of multifrequency antenna, relate in particular to a kind of multifrequency antenna that is applied on the mobile electronic device.

[background technology]

Along with the fast development of wireless network in recent years, on the performance requirement of antenna, also improve gradually, the built-in downsizing of integrating in the electronic equipment that not only requires size, and must possess characteristics such as built-in, conformability and multiband are arranged, the market competitiveness just had.

Be applicable to the telecommunications product of WLAN at present, more existing multifrequency inverted F shaped antenna commonly used designs, a kind of three-frequency antenna as No. 200849719 announcement of TaiWan, China patent disclosure, it comprises first radiant body, second radiant body and signal feed-in source, and first radiant body comprises that first metalwork that operates in high frequency band and co-operate are in second metalwork, the 3rd metalwork of a low-frequency band.Second radiant body comprises the 4th, the 5th, the 6th metalwork that operates in a medium-frequency band.Project organization complexity like this, volume is big, the requirement that the incompatibility modern electronic equipment is more and more frivolous.

Therefore, be necessary to provide the multifrequency antenna that a kind of size is little, save the space.

[summary of the invention]

Main purpose of the present invention is to provide a kind of undersized multifrequency antenna.

For achieving the above object, the present invention adopts following technical scheme: a kind of multifrequency antenna, it comprises the grounded metal sheet with an edge and an earth point, the first radiation metal arm, the second radiation metal arm, the 3rd radiation metal arm reaches the feed-in coaxial transmission line in order to transmission signals, the first radiation metal arm is one to be positioned at the L shaped sheet metal of grounded metal sheet top and it comprises a load point, the second radiation metal arm is to be positioned at the L shaped sheet metal of top of the first radiation metal arm and it works in first operational frequency bands, the 3rd radiation metal arm is to be parallel to the rectangular metal sheet at described edge and it works in second operational frequency bands, described feed-in coaxial transmission line comprises the center conductor that is connected to load point and is connected to the outer earthing conductor of earth point, load point, the first radiation metal arm, the common formation one of grounded metal sheet and earth point works in first fluting of the 3rd operational frequency bands.

Compared with prior art, the present invention electronic equipment internal space simple in structure, that take is little and easily manufactured.

[description of drawings]

Fig. 1 is the three-dimensional combination figure of multifrequency antenna of the present invention.

Fig. 2 removes the stereogram of feed-in coaxial line for multifrequency antenna of the present invention.

Fig. 3 is the test record figure of the voltage standing wave ratio frequency function of multifrequency antenna of the present invention

[embodiment]

See also Figure 1 and Figure 2, multifrequency antenna 1 of the present invention comprises a grounded metal sheet 10, one first radiation metal arm 11, one second radiation metal arm 12, one the 3rd radiation metal arm 13 and a feed-in coaxial transmission line 16.

Grounded metal sheet 10 is a rectangular large area sheet metal, and it has an edge 101 and an earth point 102.The first radiation metal arm 11 is one to be positioned at the L shaped sheet metal of grounded metal sheet 10 tops, it first limit 111 and end from first limit 111 that comprises the right-hand member of vertical adjoining edge 101 has an end 113 along 112, the second limits, second limit that the direction that is parallel to edge 101 is extended left.The second radiation metal arm 12 is one to be positioned at the L shaped sheet metal of the first radiation metal arm, 11 tops, and it has second limit 122 that direction that first limit 121 that the end 113 from the first radiation metal arm 11 extends vertically upward and the upper end edge from first limit 121 be parallel to edge 101 is extended to the right.The 3rd radiation metal arm 13 is a rectangular metal sheet, and its end 113 from the first radiation metal arm 11 extends left and is parallel to edge 101.So, first limit 121 of second limit 112 of the first radiation metal arm 11, the second radiation metal arm 12 and the 3rd radiation metal arm 13 are shared an end 113.Terminal 113 are provided with load point 114, and load point 114 also can move along the first radiation metal arm 11.Load point 114, the first radiation metal arm 11, grounded metal sheet 10 and earth point 102 common formation one are first fluting 14 of opening left.Second limit 112 of the first radiation metal arm 11 and the 12 common formation one of the second radiation metal arm are second fluting 15 of opening to the right.Feed-in coaxial transmission line 16 comprises center conductor 161 that connects load point 114 and the earthing conductor 162 that electrically connects the earth point 102 of grounded metal sheet 10.

Above-mentioned grounded metal sheet 10, the first radiation metal arm 11, the second radiation metal arm 12 and the 3rd radiation metal arm 13 can utilize single sheet metal die cut to be made, or be formed on the substrate with printing or etching mode, or etching mode is formed on the flexible printed circuit board (FPC).

Consult shown in Figure 3ly, multifrequency antenna 1 of the present invention works in three operational frequency bands.(on 2.3～2.7GHz), and 2.5～2.7GHz frequency range of first operational frequency bands meets the WiMAX standard, and 2.4～2.5GHz frequency range meets wlan standard in low first operational frequency bands for the first radiation metal arm 11 and the second radiation metal arm, 12 co-operation.The total length of the second radiation metal arm 12 is near 1/4 wavelength of the first operational frequency bands centre frequency.(on 3.3～3.8GHz), and second operational frequency bands meets the WiMAX standard in higher second operational frequency bands for the first radiation metal arm 11 and the 3rd radiation metal arm 13 co-operation.The total length of the 3rd radiation metal arm 13 is near 1/4 wavelength of the second operational frequency bands centre frequency.First fluting 14 works in relative the 3rd a highest operational frequency bands, and (on 5.15～5.85GHz), and the 3rd operational frequency bands meets wlan standard.The girth of first fluting 14 approaches 1/2 wavelength of the 3rd operational frequency bands centre frequency.Multifrequency antenna of the present invention is not limited to this three frequency bands, also can be other frequency band.Can be by the position that changes feedback point 114, the first, the 3rd frequency band that first size of slotting the 14 or first radiation metal arm 11 or the 3rd radiation metal arm 13 is adjusted this multifrequency antenna.Adjust second frequency band of this multifrequency antenna by the position that changes feedback point 114, the size of second fluting, the 15 or second radiation metal arm 12, to realize suitable WLAN system frequency band requirement.

Claims

1. multifrequency antenna, it comprises: the grounded metal sheet with an edge and an earth point, the first radiation metal arm, the second radiation metal arm, the 3rd radiation metal arm reaches the feed-in coaxial transmission line in order to transmission signals, it is characterized in that: the first radiation metal arm is one to be positioned at the L shaped sheet metal of this grounded metal sheet top and it comprises a load point, the second radiation metal arm is to be positioned at the L shaped sheet metal of top of the first radiation metal arm and it works in first operational frequency bands, the 3rd radiation metal arm is to be parallel to the rectangular metal sheet at described edge and it works in second operational frequency bands, described feed-in coaxial transmission line comprises the center conductor that is connected to load point and is connected to the outer earthing conductor of earth point, load point, the first radiation metal arm, the common formation one of grounded metal sheet and earth point works in first fluting of the 3rd operational frequency bands.

2. multifrequency antenna as claimed in claim 1 is characterized in that: the described first radiation metal arm comprise the described edge of vertical connection right-hand member first limit and from the end on first limit along second limit that the direction that is parallel to the edge is extended left.

3. multifrequency antenna as claimed in claim 2 is characterized in that: the described second radiation metal arm comprise the described first radiation metal arm of vertical connection the second limit left end first limit and be parallel to second limit that the direction at edge is extended to the right from first edge.

4. multifrequency antenna as claimed in claim 2 is characterized in that: described the 3rd radiation metal arm extends left from second limit of the first radiation metal arm, and described first, second, third radiation metal arm and grounded metal sheet are positioned on the same horizontal plane.

5. multifrequency antenna as claimed in claim 3, it is characterized in that: the described first radiation metal arm and the second radiation metal arm co-operation are on 2.3～2.7GHz frequency band, and the total length of the second radiation metal arm is near 1/4 wavelength of the centre frequency of this frequency range, and wherein 2.4～2.5GHz frequency range meets wlan standard, and 2.5～2.7GHz frequency range meets the WiMAX standard.

6. multifrequency antenna as claimed in claim 4, it is characterized in that: described first radiation metal arm and the 3rd radiation metal arm co-operation are on the 3.3～3.8GHz frequency band that meets the WiMAX standard, and the total length of the 3rd radiation metal arm is near 1/4 wavelength of the centre frequency of this frequency band.

7. as claim 1 or 5 or 6 described multifrequency antennas, it is characterized in that: described first fluting works on the 5.15～5.85GHz frequency band that meets wlan standard, and the girth of first fluting is near 1/2 wavelength of the centre frequency of this frequency band.

8. multifrequency antenna as claimed in claim 1 is characterized in that: described grounded metal sheet, the first radiation metal arm, the second radiation metal arm and the 3rd radiation metal arm are made by a single sheet metal punching press or cutting.

9. multifrequency antenna as claimed in claim 1 is characterized in that: described grounded metal sheet, the first radiation metal arm, the second radiation metal arm and the 3rd radiation metal arm are formed on the substrate by printing or etching technique.

10. multifrequency antenna as claimed in claim 1 is characterized in that: described grounded metal sheet, the first radiation metal arm, the second radiation metal arm and the 3rd radiation metal arm are formed on the flexible printed circuit board by etching technique.