CN101527387A

CN101527387A - Multiple 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

The invention relates to a multiple frequency antenna, which comprises a loop radiation part, a first radiation arm and a second radiation arm, wherein the loop radiation part comprises a break over point, a feed-in end and a grounding end, and the feed-in end and the grounding end are away from the break over point and are mutually adjacent. The first radiation arm extends outwards from the feed-in end, and the second radiation arm extends outwards from the break over point and is positioned on the same side as the loop radiation part. The multiple frequency antenna has the advantages of small volume, broad band, simple designed structure, easy frequency control, 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. multifrequency antenna comprises:

One 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;

One first radiation arm is stretched out by this feed side; And

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

2. multifrequency antenna according to claim 1, wherein, this loop Department of Radiation generally is a rectangle open loop, and comprise that an end is one first radiant section of this earth terminal, one end is connected in this first radiant section other end and generally is one second vertical radiant section with this first radiant section, and an end is connected in this second radiant section other end and generally is one the 3rd vertical radiant section with this second radiant section, the other end of the 3rd radiant section is this feed side, and the end that the 3rd radiant section links to each other with this second radiant section is this turning point.

3. multifrequency antenna according to claim 2, wherein, this first radiation arm comprises one first section that an end links to each other with the feed side of this loop Department of Radiation, and an end is connected in this other end of first section and generally is vertical one second section with this first section, and this first section generally is vertical with the 3rd radiant section.

4. multifrequency antenna according to claim 3, wherein, this second radiation arm comprises the 3rd section that an end links to each other with the turning point of this loop Department of Radiation, and an end is connected in the 3rd section the other end and generally is vertical one the 4th section with the 3rd section, and the 3rd section generally is vertical with the 3rd radiant section.

5. multifrequency antenna according to claim 4, wherein, this second section with the 4th section toward each other, an and gap at interval.

6. according to the wherein arbitrary described multifrequency antenna of claim 1-5, wherein, this loop Department of Radiation is operated in one first frequency range, and this first radiation arm combines with this loop Department of Radiation and is operated in one second frequency range, and this first frequency range and second frequency range can be synthesized and one surpassed the wideband frequency range.

7. multifrequency antenna according to claim 6, wherein, this second radiation arm combines with this loop Department of Radiation and is operated in one the 3rd frequency range that frequency range is lower than this super wideband frequency range.

8. multifrequency antenna according to claim 7, wherein, this super wideband frequency range is 3168MHz～4752MHz.

9. multifrequency antenna according to claim 8, wherein, the 3rd frequency range is 2402MHz～2480MHz.

10. multifrequency antenna according to claim 9, wherein, this first radiant section is positioned at one first plane; This second radiant section, the 3rd radiant section, this first section and the 3rd section are positioned at this first plane and generally are one second vertical plane; This second section and the 4th section is positioned at this second plane and generally is one the 3rd vertical plane.

11. multifrequency antenna according to claim 5, wherein, this gap is essentially 1.5mm.

12. multifrequency antenna according to claim 10, wherein, this length of first section is essentially 5mm, and width is essentially 4mm; This length of second section is essentially 14mm, and width is essentially 5mm.

13. multifrequency antenna according to claim 12, wherein, the 3rd section length is essentially 5mm, and width is essentially 5mm; The 4th section length is essentially 14.5mm, and width is essentially 5mm.

14. multifrequency antenna according to claim 13, wherein, the length of this first radiant section is essentially 30mm, and width is essentially 5mm; The length of this second radiant section is essentially 7mm, and width is essentially 1mm; The length of the 3rd radiant section is essentially 30mm, and width is essentially 3mm.

15. multifrequency antenna according to claim 14, it is arranged at a notebook computer.