CN101540431B - Multi-frequency antenna - Google Patents
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- CN101540431B CN101540431B CN 200810086864 CN200810086864A CN101540431B CN 101540431 B CN101540431 B CN 101540431B CN 200810086864 CN200810086864 CN 200810086864 CN 200810086864 A CN200810086864 A CN 200810086864A CN 101540431 B CN101540431 B CN 101540431B
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Abstract
The invention provides a multi-frequency antenna, which at least comprises a ground plane, a parasitic element, a first radiating body and a second radiating body, wherein the ground plane also includes a first ground plane and a second ground plane, the parasitic element is connected with one side of the ground plane and operates at a first frequency band; the first radiating body is provided with a feed point and operated in a second frequency band; the second radiating body is connected with the feed-in point and operates at a third frequency band; and the first radiating body and the second radiating body are positioned between the parasitic element and the side of the ground plane. The second ground plane can lift the height of the plane wherein the parasitic element, the first radiating body and the second radiating body are arranged, wherein the plane and the first ground plane are not in the same plane.
Description
Technical field
The relevant a kind of antenna assembly of the present invention, and particularly about a kind of antenna assembly that works in two or more different frequency ranges.
Background technology
Along with the progress of science and technology, the main battle ground of mechanics of communication is transferred to wireless mechanics of communication from wired mechanics of communication gradually.And on the transmission media of signal, being changed over the air by tangible in the past metallic circuit (as coaxial cable) is the wireless telecommunications of propagation medium, and the door of signal turnover wireless telecommunications system is antenna.Therefore, the design of antenna will influence the communication quality of wireless telecommunications system.And along with the development of various different communications protocol and then expand different bandwidths, therefore, integrate various different bandwidths by a multifrequency antenna development of wireless telecommunications is become more important.
On November 2nd, 2004, the United States Patent (USP) of bulletin disclosed a kind of multifrequency antenna the 6th, 812, No. 892.As shown in Figure 1, this multifrequency antenna 1 comprises first Department of Radiation 2, second Department of Radiation 3, grounding parts 5, connecting portion 4 and signal feed 6.Wherein connecting portion 4 is in order to connect first Department of Radiation 2 and second Department of Radiation 3.First Department of Radiation 2, second Department of Radiation 3, grounding parts 5 and connecting portion 4 all are arranged on the same plane.First Department of Radiation 2 and connecting portion 4 constitute first planar inverted F-shape antenna, work in first frequency band, and second Department of Radiation 3 and connecting portion 4 constitute another planar inverted F-shape antenna, work in lower band.Configuration realizes that double frequency receives or emission according to this.
Please refer to the voltage standing wave ratio resolution chart that Figure 2 shows that known multifrequency antenna 1, wherein when low frequency, 2.39GHz～2.53GHz, the frequency range percentage that known multifrequency antenna 1 is reached is 5.7%, can not reach the effect of low wideband.Therefore, form a kind of target that has the multifrequency antenna of low wideband and become pursuit.
Summary of the invention
Therefore purpose of the present invention is exactly that a kind of multifrequency antenna with low wideband is being provided.
For reaching above-mentioned purpose, the invention provides a kind of multifrequency antenna, comprise at least: a ground plane, this ground plane also comprise one first ground plane and one second ground plane; One parasitic antenna connects this ground plane, and this parasitic antenna operates in first frequency range; One first radiant body has a load point, and this first radiant body operates in second frequency range; One second radiant body connects this load point, and this second radiant body operates in the 3rd frequency range, and wherein this first radiant body and this second radiant body are between this parasitic antenna and this ground plane; This second ground plane can this parasitic antenna of lifting, this first radiant body and the common residing plane of this second radiant body one height, wherein this plane and this first ground plane copline not.
For reaching above-mentioned purpose, the invention provides a kind of multifrequency antenna, comprise at least: a ground plane, wherein this ground plane comprises one first ground plane and one second ground plane; One parasitic antenna connects a first side of this second ground plane, and this parasitic antenna operates in first frequency range; One first radiant body has a load point, and this first radiant body operates in second frequency range; One second radiant body connects a second side of this load point and this second ground plane, this second side and this first side adjacency, and this second radiant body operates in the 3rd frequency range, wherein this second ground plane is understood this first radiant body of lifting and this second radiant body position, make this first radiant body and this second radiant body not with this same plane of first ground plane, wherein, this parasitic antenna and this second ground plane a common cross section that constitutes present one " ㄈ " font outward appearance, this first radiant body and this second radiant body projection in this cross section are positioned at this " ㄈ " range of glyphs.
Description of drawings
For above and other objects of the present invention, feature, advantage can be become apparent, below conjunction with figs. is elaborated to preferred embodiment of the present invention, wherein:
Figure 1 shows that known multifrequency antenna summary icon.
Figure 2 shows that the voltage standing wave ratio resolution chart of known multifrequency antenna.
Fig. 3 has illustrated according to the present invention the multifrequency antenna summary icon of first preferred embodiment.
Figure 4 shows that the current path of parasitic antenna when resonance.
Figure 5 shows that the current path of first radiant body when resonance.
Fig. 6 current path of second radiant body in when resonance of doing.
Fig. 7 has shown that the voltage standing wave ratio (VSWR) of multifrequency antenna of the present invention under different frequency changes.
Figure 8 shows that the multifrequency antenna summary icon of second preferred embodiment according to the present invention.
Figure 9 shows that the multifrequency antenna summary icon of the 3rd preferable concrete enforcement according to the present invention.
Figure 10 shows that the multifrequency antenna summary icon of the 4th preferable concrete enforcement according to the present invention.
Figure 11 to Figure 13 is the radiation pattern figure that multifrequency antenna of the present invention is operated in X-Y under the different frequency, Y-Z and X-Z plane.
Embodiment
Fig. 3 has illustrated the multifrequency antenna 100 summary icons according to a preferred embodiment of the present invention.Multifrequency antenna 100 of the present invention comprises a parasitic antenna 101, one first radiant body 102, one second radiant body 103, a Connection Element 104 and a ground plane 105.Wherein a side 105a of ground plane 105 has a signal ground point 107 in order to connect parasitic antenna 101.First radiant body 102 and 103 of second radiant bodies are connected to a signal feed-in point 106 jointly.
According to the first embodiment of the present invention, parasitic antenna 101, first radiant body 102 all become the lengthwise strip with second radiant body 103, and are arranged in order on same plane with ground plane 105.Parasitic antenna 101 is arranged in outermost and is coupled to signal ground point 107, and slightly is " ㄈ " font with the formed outward appearance of a side 105a of ground plane 105 and has towards the opening of a specific direction.The position of signal feed-in point 106 is near the place, bottom of this " ㄈ " font and this side 105a of close ground plane 105.First radiant body 102 is arranged in the below of parasitic antenna 101, wherein this first radiant body 102 therewith signal feed-in point 106 connect and be the lengthwise strip towards this specific direction along exhibition.Second radiant body 103 is arranged in the below of first radiant body 102, wherein this second radiant body 103 also therewith signal feed-in point 106 connect and be the lengthwise strip in one embodiment towards this specific direction along exhibition, a Connection Element 104 is in order to be connected to this second radiant body 103 the side 105a of ground plane 105.In other words, according to the configuration of multifrequency antenna 100 of the present invention, first radiant body 102 and second radiant body 103 are to be coated among parasitic antenna 101 and the side 105a.
In one embodiment, parasitic antenna 101 of the present invention, have first end 101a and a second end 101b, first end 101a is parallel to side 105a and connects signal ground point 107 by the second end 101b, first end 101a vertical the second end 101b for example wherein, the common outward appearance that forms of first end 101a, the second end 101b and side 105a slightly is " ㄈ " font.First radiant body 102 has one the 3rd end 102a and the 4th end 102b, and the 3rd end 102a is parallel to side 105a and connects signal feed-in point 106 by the 4th end 102b.Second radiant body 103 has the 103a of five terminal portion and the 6th end 103b, and the 103a of five terminal portion is parallel to side 105a and connects signal feed-in point 106 by the 6th end 103b.Connection Element 104 is in order to connect the 103a of five terminal portion and side 105a.
Signal feed-in point 106 is to be connected to a coaxial transmission line (not showing among the figure) with signal ground point 107, and signal feed-in point 106 is connected with the inner core lead of coaxial transmission line, and signal ground point 107 is connected with the wire sheathing of coaxial transmission line.The inner core lead can be by signal feed-in point 106 with current fed to first radiant body 102 and second radiant body 103, and this feed-in electric current can be put 107 feed-in parasitic antennas 101 by ground plane 105, signal ground.Consult Fig. 4 to Fig. 6 and described parasitic antenna 101, first radiant body 102 and second radiant body 103 current path when resonance respectively.As shown in the figure, the current path 401,501 and 601 that produces on parasitic antenna 101, first radiant body 102 and second radiant body 103 from the electric current of signal feed-in point 106 feed-ins all is in the same direction, that is all are directions of 108 towards the hole, therefore, each feed-in electric current can't offset each other, has increased the service efficiency of feed-in electric current.
According to the present invention, parasitic antenna 101 is in order to operating in the low frequency frequency range, and first radiant body 102 is in order to operating in the intermediate frequency frequency range, and second radiant body 103 is in order to operate in high-frequency band.According to this, if multifrequency antenna 100 of the present invention is for the WiMAX communication, then the band limits of parasitic antenna 101 operations is from 2.3GHz～2.7GHz, the band limits of first radiant body, 102 operations is from 3.3GHz～3.8GHz, and the band limits of second radiant body, 103 operations is from 5.15GHz～5.85GHz.And in other embodiments, also can make parasitic antenna 101 operate in the intermediate frequency frequency range by adjusting the size of parasitic antenna 101 and first radiant body 102, first radiant body 102 operates in the low frequency frequency range.
On the other hand, according to multifrequency antenna 100 structures of the present invention, parasitic antenna 101 can produce resonance with first radiant body 102, therefore can be by adjusting parasitic antenna 101 or/and the size of first radiant body 102, make the band limits combination of parasitic antenna 101 and the operation of first radiant body 102, and be provided as a wideband segment limit, the frequency range frequency range operated originally greater than parasitic antenna and first radiant body of the frequency range of this frequency range wherein.Allow this multifrequency antenna 100 operate in two-way from originally operating in three frequency ranges, becoming.Its relevant frequency range measurement result please refer to Fig. 7, and Fig. 7 has shown that the voltage standing wave ratio (VSWR) of multifrequency antenna 100 of the present invention under different frequency changes.Because the combination of low frequency frequency range and intermediate frequency frequency range, make that its whole frequency scope is from 2.144GHz～3.878GHz under voltage standing wave ratio is 2 situation by finding out among the figure, frequency range percentage can reach 57.7%.
Consult the multifrequency antenna 200 summary icons that Figure 8 shows that second preferred embodiment according to the present invention.According to present embodiment, multifrequency antenna 200 has the ground plane of a bending outward appearance, comprise first ground plane 205 and second ground plane 206, wherein parasitic antenna 101, first radiant body 102, second radiant body 103 and Connection Element 104 are connected first ground plane 205 by second ground plane 206.Second ground plane 206 can lifting parasitic antennas 101, first radiant body 102, second radiant body 103 and Connection Element 104 common residing planes, cause and first ground plane 205 copline not, and make multifrequency antenna 200 have the outward appearance of a similar step.In one embodiment, first ground plane 205 is perpendicular to second ground plane 206, and wherein the height h of second ground plane is the height that parasitic antenna 101, first radiant body 102, second radiant body 103 and Connection Element 104 are lifted.
Consult the multifrequency antenna 300 summary icons that Figure 9 shows that the 3rd preferable concrete enforcement according to the present invention.According to present embodiment, multifrequency antenna 300 has the ground plane of a bending outward appearance, comprise first ground plane 205 and second ground plane 206, wherein first radiant body 102, second radiant body 103 and Connection Element 104 are connected first ground plane 205 by second ground plane 206.Second ground plane 206 can liftings first radiant body 102, second radiant body 103 and Connection Element 104 common residing planes one height, causes and first ground plane 205 copline not, and makes multifrequency antenna 200 have the outward appearance of a similar step.In this embodiment, parasitic antenna 301 is that the side that is not connected with second radiant body 103 from second ground plane 206 outwards extends and goes out, and cross sections of 206 common formations of parasitic antenna 301 and second ground plane slightly are " ㄈ " font.Wherein, first radiant body 102 and second projection of radiant body 103 on this cross section are to drop in this " ㄈ " font.In one embodiment, this parasitic antenna 301 comprises the first plane 301a and the second plane 301b, wherein has an angle between the first plane 301a and the second plane 301b, and in one embodiment, this angle for example is about 90 degree.The first plane 301a, the second plane 301b present one " ㄈ " font outward appearance with 206 common cross sections that constitute of second ground plane, and wherein the first plane 301a need be not less than 102 projections of upper limb 110 on this cross section of first radiant body.
Consult the multifrequency antenna 400 summary icons that Figure 10 shows that the 4th preferable concrete enforcement according to the present invention.The difference of present embodiment and the 3rd embodiment maximum be in, according to multifrequency antenna 400 configuration of present embodiment, second radiant body 103 and Connection Element 104 are positioned at same plane, but an end of first radiant body 402 and this interplanar have an angle.In one embodiment, this end causes with this interplanar to have an angle to carry out recessed folding towards the direction of parasitic antenna 301, and for example, this angle is about 90 degree, embodiment according to this, and a surperficial 402a of end is towards parasitic antenna 301.In one embodiment, this parasitic antenna 301 comprises the first plane 301a and the second plane 301b, present one " ㄈ " font outward appearance with 206 common cross sections that constitute of second ground plane, wherein the first plane 301a need be not less than the projection of surperficial 402a on this cross section of first radiant body, 402 recessed folding ends.According to this, owing to only need the first plane 301a to be not less than the surperficial 402a of recessed folding end, therefore, can allow the entire antenna device volume dwindle, and because therefore recessed folding end is perpendicular to the cross section,, can under the situation that does not influence overall volume, enlarge the area of first radiant body 402, and increase frequency range.
Figure 11 to Figure 13 is the radiation pattern figure that multifrequency antenna of the present invention is operated in X-Y under the different frequency, Y-Z and X-Z plane, and clearly, multifrequency antenna of the present invention all has very average radiation field pattern on each plane, and reaches isotropic requirement.
Though the present invention discloses as above with a preferred embodiment; yet it is not in order to limit the present invention; any person skilled in the art person; without departing from the spirit and scope of the present invention; when can making the various changes that are equal to or replacement, so protection scope of the present invention is when looking accompanying being as the criterion that the application's claim scope defines.
Claims (31)
1. multifrequency antenna comprises at least:
One ground plane, this ground plane also comprise one first ground plane and one second ground plane;
One parasitic antenna connects a side of this ground plane, and this parasitic antenna operates in first frequency range;
One first radiant body has a load point, and this first radiant body operates in second frequency range;
One second radiant body connects this load point, and this second radiant body operates in the 3rd frequency range, and wherein this first radiant body and this second radiant body are between this side of this parasitic antenna and this ground plane;
It is characterized in that this second ground plane can this parasitic antenna of lifting, this first radiant body and the common residing plane of this second radiant body one height, wherein this plane and this first ground plane copline not.
2. multifrequency antenna according to claim 1 is characterized in that also comprising a Connection Element, and wherein this second radiant body joins by this side of this Connection Element and this ground plane.
3. multifrequency antenna according to claim 1 is characterized in that the outward appearance of this side formation of this parasitic antenna and this ground plane slightly is " ㄈ " font and tool one opening.
4. multifrequency antenna according to claim 3 is characterized in that formed current path direction is all towards this opening on this parasitic antenna, this first radiant body and this second radiant body.
5. multifrequency antenna according to claim 1 is characterized in that tool one angle between this first ground plane and this second ground plane.
6. multifrequency antenna according to claim 5 is characterized in that this angle is 90 degree.
7. multifrequency antenna according to claim 1 is characterized in that this parasitic antenna, also comprises a first end and a second end, and this first end is parallel to this side and connects this side of this ground plane by this second end.
8. multifrequency antenna according to claim 1 is characterized in that this first radiant body, has one the 3rd end and one the 4th end, and the 3rd end parts parallel connects this load point in this side of this ground plane and by the 4th end.
9. multifrequency antenna according to claim 1 is characterized in that this second radiant body, has a five terminal portion and one the 6th end, and this five terminal portion is parallel to this side of this ground plane and connects this load point by the 6th end.
10. multifrequency antenna according to claim 1 is characterized in that this first frequency range is 2.3GHz～2.7GHz.
11. multifrequency antenna according to claim 1 is characterized in that this second frequency range is 3.3GHz～3.8GHz.
12. multifrequency antenna according to claim 1 is characterized in that the 3rd frequency range is 5.15GHz～5.85GHz.
13. multifrequency antenna according to claim 1, it is characterized in that being one the 4th frequency range in conjunction with this first frequency range and this second frequency range by this parasitic antenna of modulation and/or this first radiant body outward appearance, wherein the frequency range of the 4th frequency range is greater than this first frequency range and this second frequency range.
14. a multifrequency antenna comprises at least:
One ground plane, wherein this ground plane comprises one first ground plane and one second ground plane;
One parasitic antenna connects a first side of this second ground plane, and this parasitic antenna operates in first frequency range;
One first radiant body has a load point, and this first radiant body operates in second frequency range;
One second radiant body connects a second side of this load point and this second ground plane, this second side and this first side adjacency, and this second radiant body operates in the 3rd frequency range, wherein this second ground plane is understood this first radiant body of lifting and this second radiant body position, make this first radiant body and this second radiant body not with this same plane of first ground plane
Wherein, this parasitic antenna and this second ground plane a common cross section that constitutes present one " ㄈ " font outward appearance, this first radiant body and this second radiant body projection in this cross section are positioned at this " ㄈ " range of glyphs.
15. multifrequency antenna according to claim 14 is characterized in that this second radiant body joins by a Connection Element and this second side.
16. multifrequency antenna according to claim 14, it is characterized in that this parasitic antenna also comprises one first plane and one second plane, this first plane connects this first side by this second plane, and this first plane is not less than on this first radiant body one projected position because of this cross section in the position in a cross section.
17. multifrequency antenna according to claim 16 is characterized in that this first plane parallel is in this second ground plane.
18. multifrequency antenna according to claim 16 is characterized in that this first plane and this second interplanar tool, one angle.
19. multifrequency antenna according to claim 18 is characterized in that this angle is 90 degree.
20. multifrequency antenna according to claim 14 is characterized in that formed current path direction all in the same direction on this parasitic antenna, this first radiant body and this second radiant body.
21. multifrequency antenna according to claim 14 is characterized in that this first radiant body, has a first end and a second end, this first end is parallel to this second side and connects this load point by this second end.
22. multifrequency antenna according to claim 21 is characterized in that tool one angle between this first end and this second end, makes the direction recessed folding of this first end towards this parasitic antenna.
23. multifrequency antenna according to claim 22 is characterized in that this angle is 90 degree, this first end is parallel to this parasitic antenna.
24. multifrequency antenna according to claim 22 is characterized in that on this cross section this parasitic antenna is not less than this first end in the projection in this cross section.
25. multifrequency antenna according to claim 14 is characterized in that this second radiant body, has one the 3rd end and one the 4th end, the 3rd end parts parallel connects this load point in this second side and by the 4th end.
26. multifrequency antenna according to claim 14 is characterized in that this first frequency range is 2.3GHz～2.7GHz.
27. multifrequency antenna according to claim 14 is characterized in that this second frequency range is 3.3GHz～3.8GHz.
28. multifrequency antenna according to claim 14 is characterized in that the 3rd frequency range is 5.15GHz～5.85GHz.
29. multifrequency antenna according to claim 14, it is characterized in that being one the 4th frequency range in conjunction with this first frequency range and this second frequency range by this parasitic antenna of modulation and/or this first radiant body outward appearance, wherein the frequency range of the 4th frequency range is greater than this first frequency range and this second frequency range.
30. multifrequency antenna according to claim 14 is characterized in that tool one angle between this first ground plane and this second ground plane.
31. multifrequency antenna according to claim 30 is characterized in that this angle is 90 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810086864 CN101540431B (en) | 2008-03-17 | 2008-03-17 | Multi-frequency antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200810086864 CN101540431B (en) | 2008-03-17 | 2008-03-17 | Multi-frequency antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101540431A CN101540431A (en) | 2009-09-23 |
| CN101540431B true CN101540431B (en) | 2013-07-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200810086864 Active CN101540431B (en) | 2008-03-17 | 2008-03-17 | Multi-frequency antenna |
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| CN (1) | CN101540431B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104425874B (en) * | 2013-09-10 | 2017-05-17 | 启碁科技股份有限公司 | Antenna and electronic device |
| CN104953234B (en) * | 2014-03-26 | 2018-02-09 | 宏碁股份有限公司 | Handheld apparatus |
| CN108649332A (en) * | 2018-04-23 | 2018-10-12 | 歌尔科技有限公司 | A kind of multifrequency microstrip antenna and electronic equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1409570A (en) * | 2001-09-14 | 2003-04-09 | 诺基亚有限公司 | Internal multiple frequency antenna with improved radiation effeciency |
| US6650294B2 (en) * | 2001-11-26 | 2003-11-18 | Telefonaktiebolaget Lm Ericsson (Publ) | Compact broadband antenna |
-
2008
- 2008-03-17 CN CN 200810086864 patent/CN101540431B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1409570A (en) * | 2001-09-14 | 2003-04-09 | 诺基亚有限公司 | Internal multiple frequency antenna with improved radiation effeciency |
| US6650294B2 (en) * | 2001-11-26 | 2003-11-18 | Telefonaktiebolaget Lm Ericsson (Publ) | Compact broadband antenna |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2007-184883A 2007.07.19 |
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| CN101540431A (en) | 2009-09-23 |
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