CN101527387A

CN101527387A - multi-frequency antenna

Info

Publication number: CN101527387A
Application number: CN 200810083247
Authority: CN
Inventors: 蔡调兴; 吴朝旭; 方启印
Original assignee: Quanta Computer Inc
Current assignee: Quanta Computer Inc
Priority date: 2008-03-04
Filing date: 2008-03-04
Publication date: 2009-09-09
Anticipated expiration: 2028-03-04
Also published as: CN101527387B

Abstract

A multi-frequency antenna comprises a loop radiation part, a first radiation arm and a second radiation arm. The loop radiating part comprises a turning part, a feed-in terminal and a grounding terminal, wherein the feed-in terminal is far away from the turning part and is adjacent to the turning part. The first radiating arm extends outward from the feed end. The second radiating arm extends outwards from the turning part and is positioned on the same side of the loop radiating part as the first radiating arm. The invention has the advantages of small volume, wide frequency, simple designed structure, easy control of frequency and the like.

Description

Multifrequency antenna

Technical field

The invention relates to a kind of multifrequency antenna, be meant a kind of multifrequency antenna that is applied to individual radio Local Area Network (WPAN) especially.

Background technology

Bluetooth (Bluetooth) communication technology be by Sony Ericsson of Sweden telecommunications company (Sony Ericsson) 1998 research and develop, be named bluetooth allusion is arranged, pass on from one to another Norway in tenth century, there is individual Wei Jing king to be named as " Harrar moral bluetooth " (Harald Bluetooth), he stays the annals of history because of unified Denmark name, behind the millennium, the sales staff of Sony Ericsson thinks that they are at unified consumer electronics commodity, the contribution that the world the is done Harrar moral bluetooth king that can match in excellence or beauty is therefore with this Radio Transmission Technology called after bluetooth.

Yet Luo Guanzhong makes clear the purpose and main theme from the very beginning in its The Romance of the Three Kingdoms of showing and just talks about " momentum of history; divide and must close for a long time; close for a long time and must divide ", Sony Ericsson wants to unify the consumer electronics commodity with Bluetooth technology, but the various communication technologys but are constantly to weed out the old and bring forth the new, (Ultra-Wideband, UWB) (Federal Communication Commission FCC) allowed and uses on consumption electronic products technology for example super wideband by FCC in 2002.

And be applied to the notebook computer built-in aerial of above-mentioned two kinds of communication technologys { be individual radio Local Area Network WPAN[2.402～2.480GHz (Bluetooth) and 3.168～4.752GHz (UWB Band I)] }, at present all with reversed F-typed plate aerial (PIFA, Planar Inverted-F Antennas) antenna frame of pattern is realized, partly design can add parasitism or coupling element, spatially overlap and produce stronger coupling amount, to reach the effect of double frequency or wideband.At this, the present invention also proposes the multifrequency antenna of a kind of WPAN of being applied to, with the gain consumption market.

Summary of the invention

Therefore, purpose of the present invention, promptly provide that a kind of volume is little, wideband, design simple in structure and control the multifrequency antenna of its frequency easily.

So multifrequency antenna of the present invention is to comprise a loop Department of Radiation, one first radiation arm and one second radiation arm.

The loop Department of Radiation comprises a turning point, away from this turning point and a feed side and an earth terminal adjacent one another are.

First radiation arm is to be stretched out by this feed side.

Second radiation arm is to be stretched out by this turning point, and is positioned at the same side of this loop Department of Radiation with this first radiation arm.

Description of drawings

Fig. 1 is a stereogram, and the structure of the preferred embodiment of multifrequency antenna of the present invention is described;

Fig. 2 is a schematic diagram, illustrates that the preferred embodiment is arranged at the position of notebook computer;

Fig. 3 is a plane graph (reverse side), and the structure of the preferred embodiment is described;

Fig. 4 is a plane graph (front), and the structure of the preferred embodiment is described;

Fig. 5 is a plane graph, and the size of the preferred embodiment is described;

Fig. 6 is the measurement result figure of the voltage standing wave ratio (VSWR) of the preferred embodiment, (a) curve is result measured when only the loop Department of Radiation exists, (b) curve is that the loop Department of Radiation combines the measured result in back with first radiation arm, and (c) curve is that loop Department of Radiation, first radiation arm and second radiation arm of the multifrequency antenna of present embodiment is in conjunction with the measured result in back.

Fig. 7 is the measurement result figure of the preferred embodiment voltage standing wave ratio (VSWR) of being arranged at notebook computer;

Fig. 8 is radiation pattern (Radiation Pattern) figure of the preferred embodiment when 2440MHz;

Fig. 9 is radiation pattern (Radiation Pattern) figure of the preferred embodiment when 3168MHz;

Figure 10 is radiation pattern (Radiation Pattern) figure of the preferred embodiment when 3960MHz; And

Figure 11 is radiation pattern (Radiation Pattern) figure of the preferred embodiment when 4752MHz.

The main element symbol description

1 multifrequency antenna

2 loop Departments of Radiation

21 first radiant sections

22 second radiant sections

23 the 3rd radiant sections

24 turning points

25 feed sides

26 earth terminals

3 first radiation arms

31 first sections

32 second sections

4 second radiation arms

43 the 3rd sections

44 the 4th sections

45 gaps

8 coaxial transmission lines

81 anodes

82 negative terminals

9 notebook computers

91 positions

92 positions

Embodiment

About aforementioned and other technology contents, characteristics and effect of the present invention, in a following cooperation DETAILED DESCRIPTION OF THE PREFERRED with reference to the accompanying drawings, can clearly present.

Consult Fig. 1 and Fig. 2, the preferred embodiment of multifrequency antenna 1 of the present invention is to be arranged in the notebook computer 9, and the position of setting can be position 91 or position 92, and its primary structure comprises a loop Department of Radiation 2, one first radiation arm 3 and one second radiation arm 4.

Be contained in the particular space in the notebook computer 9 for convenience, multifrequency antenna 1 is designed to three-dimensional pattern and is arranged in the notebook computer 9, yet the pattern that it can also the plane exists, in this its structure for convenience of description, so (consult Fig. 3 and Fig. 4 with the pattern on plane earlier, Fig. 4 is a front view, and Fig. 3 is a reverse view) explain.

Loop Department of Radiation 2 generally is a rectangle open loop, comprises one first radiant section 21, one second radiant section 22, one the 3rd radiant section 23, a turning point 24, away from this turning point 24 and a feed side 25 and an earth terminal 26 adjacent one another are.One end (open end) of first radiant section 21 is earth terminal 26, and its other end links to each other with an end of second radiant section 22, and first,

second radiant section

21,22 both generally be vertical.The other end of second radiant section 22 is to link to each other with an end of the 3rd radiant section 23, and second, third

radiant section

22,23 both generally be vertically, and the other end of the 3rd radiant section 23 is feed side 25.In addition, turning point 24 is the end that the 3rd radiant section 23 links to each other with second radiant section 22.What deserves to be mentioned is that the anode 81 of an available coaxial transmission line 8 is connected to feed side 25, and the negative terminal 82 of coaxial transmission line 8 just is connected to earth terminal 26, to finish the feed-in of signal.

First radiation arm 3 is to be stretched out by feed side 25, comprise one first section 31 that an end links to each other with the feed side 25 of loop Department of Radiation 2, and an end is connected in first section 31 the other end and generally is vertical one second section 32 with first section 31, and first section 31 generally be vertical with the 3rd radiant section 23.

Second radiation arm 4 is to be stretched out by turning point 24, and be positioned at the same side of loop Department of Radiation 2 with first radiation arm 3, it comprises one the 3rd section 43 that an end links to each other with the turning point 24 of loop Department of Radiation 2, and an end is connected in the 3rd section 43 the other end and generally is vertical one the 4th section 44 with the 3rd section 43, and the 3rd section 43 generally be vertical with the 3rd radiant section 23.In addition, the 4th section 44 and second sections 32 toward each other, and one gap 45, interval.

Consult Fig. 4 and Fig. 5, Fig. 5 is the size sign picture of the multifrequency antenna 1 of this preferred embodiment, by finding out among the figure, the 4th section 44 and second sections 32 gaps that are separated by 45 are 1.5mm, and the gap that first radiant section 21 and the 3rd radiant section 23 are separated by is 1mm, this 1mm is the width of second radiant section 22, is shown in the tabulation 1 down in this lengths table with each section.

When with multifrequency antenna 1 when the plane pattern of Fig. 4 is bent into the three-dimensional pattern of Fig. 1, first radiant section 21 is positioned at one first plane (figure does not show); Second radiant section 22, the 3rd radiant section 23, first section 31 and the 3rd section 43 are positioned at first plane and generally are vertical one second plane (figure does not show); Second section 32 and the 4th section 44 is positioned at second plane and generally is vertical one the 3rd plane (figure does not show).By being bent into three-dimensional mode, can dwindle antenna volume, the utilance on the increase industry.

	Length (mm)	Width (mm)
	Length (mm)	Width (mm)	First radiant section	30	5
Second radiant section	7	1	First radiant section	30	5
Second radiant section	7	1	The 3rd radiant section	30	3
First section	5	4	The 3rd radiant section	30	3
First section	5	4	Second section	14	5
The 3rd section	5	5	Second section	14	5
The 3rd section	5	5	The 4th section	14.5	5

Table 1

And this multifrequency antenna 1 is mainly used in (but being not limited to) super wideband frequency range (UWBBand I in the present embodiment, 3168MHz～4752MHz) and bluetooth frequency range (Bluetooth, 2402MHz～2480MHz), its design concept is to utilize loop Department of Radiation 2 to be operated in one first frequency range (being roughly super wideband frequency range), one the 3rd frequency range of utilizing second radiation arm 4 to combine with loop Department of Radiation 2 again and making multifrequency antenna 1 can be operated in frequency range to be lower than super wideband frequency range (be the bluetooth frequency range, 2402MHz～2480MHz); And want to allow multifrequency antenna 1 be operated in two above-mentioned frequency ranges, can carry out the adjustment (as the size of table 1) of length or width at each section of the loop Department of Radiation 2 and second radiation arm 4, to be adjusted to desired frequency range.Yet, consult Fig. 6, (a) curve of Fig. 6 is antenna measured voltage standing wave ratio (VSWR) when only having loop Department of Radiation 2 to exist, as can be seen from Figure, in the super wideband frequency range of 3168MHz～4752MHz, its impedance matching poor effect, frequency range are narrower, and the voltage standing wave ratio (VSWR) that a bit of frequency range is for example arranged is greater than 2.5; In view of this, the present invention has added the design of first radiation arm 3, combine with loop Department of Radiation 2 and make multifrequency antenna 1 can be operated in one second frequency range (being roughly super wideband frequency range) by first radiation arm 3, and the synthetic multifrequency antenna 1 that makes of first frequency range and second frequency range can be under the requirement that meets voltage standing wave ratio (VSWR), be operated in desired super wideband frequency range, shown in (b) curve of Fig. 6, the voltage standing wave ratio (VSWR) that is measured to for the antenna that is combined with the loop Department of Radiation 2 and first radiation arm 3, as can be seen from Figure, in the super wideband frequency range of 3168MHz～4752MHz, its voltage standing wave ratio (VSWR) is all less than 2.5, and less than the value of (a) curve, so work bandwidth can comprise whole super wideband frequency band, solved the problem of frequency range deficiency.In addition, the voltage standing wave ratio that (c) curve of Fig. 6 then is measured to for the multifrequency antenna 1 that is combined with loop Department of Radiation 2, first radiation arm 3 and second radiation arm 4, relatively (c) curve and (b) curve are as can be seen, (c) curve is because many second radiation arms 4, so can be operated in the frequency range of 2402MHz～2480MHz, and its voltage standing wave ratio (VSWR) can be less than 2.5.

Fig. 7 schemes for the voltage standing wave ratio (VSWR) that multifrequency antenna 1 is applied to notebook computer 9 (see figure 2)s, and as can be seen from Figure, frequency all can be less than 2.5 from 2402MHz～2480MHz and 3168MHz～4752MHz.And page table 2 is total radiation energy (Total RadiationPower) and efficient (Efficiency) sorting table of multifrequency antenna 1 in application band down, in showing, can find out, and total radiation energy＞-5.5dB, and efficient＞30%.At last, Fig. 5～Fig. 8 is radiation pattern (Radiation Pattern) figure that this preferred embodiment is measured at 2440MHz, 3168MHz, 3960MHz and 4752MHz respectively, and by finding out among the figure, the omni-directional of its radiation pattern is good.

Frequency (MHz)	Total radiation energy (dB)	Efficient (%)
Frequency (MHz)	Total radiation energy (dB)	Efficient (%)	2402	-5.2	30.2

2440	-4.2	37.6
2440	-4.2	37.6	2480	-4.4	36.4
3168	-3.2	48.1	2480	-4.4	36.4
3168	-3.2	48.1	3432	-3.2	48.2
3696	-3.1	48.5	3432	-3.2	48.2
3696	-3.1	48.5	3960	-2.8	52.6
4224	-3.3	47.3	3960	-2.8	52.6
4224	-3.3	47.3	4488	-4.0	39.7
4752	-4.4	36.0	4488	-4.0	39.7

Table 2

In sum, the volume of present embodiment multifrequency antenna 1 is little and solved the problem of frequency range deficiency and reached the characteristics of wideband by the design of second radiation arm 4, and its project organization is simple, and control frequency easily is so can realize purpose of the present invention really.

The above person only is the preferred embodiments of the present invention, and when not limiting scope of the invention process with this, promptly the simple equivalent of doing according to description of the present invention generally changes and modifies, and all still belongs in the scope that the present invention contains.

Claims

1. A multi-frequency antenna, comprising:

A loop radiation part, including a turning point, a feed-in end and a grounding end that are far away from the turning point and adjacent to each other;

a first radiating arm extending outward from the feeding end; and

A second radiating arm extends outward from the turning point and is located on the same side of the loop radiating portion as the first radiating arm.

2. The multi-frequency antenna according to claim 1, wherein the loop radiating portion is roughly a rectangular open loop, and includes a first radiating section with one end being the ground terminal, one end connected to the other end of the first radiating section and a second radiating section approximately perpendicular to the first radiating section, and a third radiating section connected at one end to the other end of the second radiating section and approximately perpendicular to the second radiating section, the third radiating section The other end is the feed-in end, and the end where the third radiating section is connected to the second radiating section is the turning point.

3. The multi-frequency antenna according to claim 2, wherein the first radiating arm comprises a first section with one end connected to the feeding end of the loop radiation part, and one end connected to the other end of the first section and a second segment approximately perpendicular to the first segment, the first segment approximately perpendicular to the third radial segment.

4. The multi-frequency antenna according to claim 3, wherein the second radiating arm comprises a third section whose one end is connected to the turning point of the loop radiation part, and one end is connected to the other end of the third section and is connected to The third section is approximately vertical to a fourth section, and the third section is approximately perpendicular to the third radial section.

5. The multi-frequency antenna according to claim 4, wherein the second segment and the fourth segment face each other with a gap therebetween.

6. The multi-frequency antenna according to any one of claims 1-5, wherein the loop radiating part works in a first frequency band, and the first radiating arm is combined with the loop radiating part to work in a second frequency band, And the first frequency band and the second frequency band can be synthesized into an ultra-wideband frequency band.

7. The multi-frequency antenna according to claim 6, wherein the second radiating arm is combined with the loop radiating part to work in a third frequency band whose frequency range is lower than the ultra-wideband frequency band.

8. The multi-frequency antenna according to claim 7, wherein the ultra-wideband frequency range is 3168MHz-4752MHz.

9. The multi-frequency antenna according to claim 8, wherein the third frequency band is 2402MHz˜2480MHz.

10. The multi-frequency antenna according to claim 9, wherein the first radiating section is located on a first plane; the second radiating section, the third radiating section, the first section and the third section are located in the same plane as the The first plane is approximately perpendicular to a second plane; the second section and the fourth section are located on a third plane approximately perpendicular to the second plane.

11. The multi-frequency antenna according to claim 5, wherein the gap is substantially 1.5mm.

12. The multi-frequency antenna according to claim 10, wherein the length of the first segment is substantially 5 mm, and the width is substantially 4 mm; the length of the second segment is substantially 14 mm, and the width is substantially 5 mm.

13. The multi-frequency antenna according to claim 12, wherein the length of the third segment is substantially 5 mm, and the width is substantially 5 mm; the length of the fourth segment is substantially 14.5 mm, and the width is substantially 5 mm.

14. The multi-frequency antenna according to claim 13, wherein the length of the first radiating section is substantially 30 mm, and the width is substantially 5 mm; the length of the second radiating section is substantially 7 mm, and the width is substantially 1 mm ; The length of the third radiating section is substantially 30 mm, and the width is substantially 3 mm.

15. The multi-frequency antenna according to claim 14, which is set on a notebook computer.