CN1291522C

CN1291522C - Multiple-frequency antenna for portable electronic equipment

Info

Publication number: CN1291522C
Application number: CN 02155785
Authority: CN
Inventors: 陈发坚
Original assignee: Quanta Computer Inc
Current assignee: Quanta Computer Inc
Priority date: 2002-12-06
Filing date: 2002-12-06
Publication date: 2006-12-20
Anticipated expiration: 2022-12-06
Also published as: CN1507112A

Abstract

The present invention relates to a multifrequency antenna of a portable electron device, which comprises a base plate, a radiation element, a microstrip metal wire, an earthing metal surface and a transmission line, wherein the base plate is provided with a first base surface and a second base surface which is opposite with the first base surface; the radiation element is arranged on the first base surface; the microstrip wire and the earthing metal surface are mutually and electrically arranged on the second base surface in an isolated mode; the microstrip metal wire, the earthing metal surface and the radiation element are mutually and electrically connected; the transmission line is provided with a first conduction part for carrying and transferring an electromagnetic wave signal, and a second conduction part which is mutually and electrically isolated with the first conduction part; the first conduction part is mutually and electrically connected with the microstrip metal wire; the second conduction part is mutually and electrically connected with the earthing metal surface; the purpose of containing multifrequency bands can be achieved.

Description

The multifrequency antenna of portable electronic devices

(1) technical field

The multifrequency antenna of the relevant a kind of portable electronic devices of the present invention is meant a kind of multifrequency antenna that is used for the portable electronic devices of radio area network especially.

(2) background technology

Radio area network is meant that a kind of radio magnetic wave of high frequency that utilizes asks the Local Area Network that carries out communication at different nodes, is different from and utilizes cable to carry out the line transmission manner in the tradition.Therefore can exempt puzzlement in the wiring and the obstacle on the environment, and the function that provides the user to roam, to adapt to network environment anywhere or anytime.

In the transmission technology of radio area network, microwave (microwave), exhibition different modes such as (spreadspectrum), infrared ray have frequently been comprised.Wherein, frequently technology is most popular with exhibition, international electronic motor association (IEEE) also proposes 802.11 specification to this, comprise IEEE 802.11a and 802.11b, the difference of the two is except modulation mode difference, and 802.11a is that the frequency range that is 5.15GHz defines, and being frequency range at 2.4GHz, 802.11b defines, make above-mentioned standard on ISM band, use, comprise 2.4-2.4835GHz (available bandwidth 83.5MHz), and 5.15-5.35GHz (available bandwidth 200MHz).

So, in order to make electronic installation can rove in the radio area network, just need corresponding Antenna Design to adapt to, to carry out the radio magnetic wave transmitting-receiving of different frequency range.In design in the past, with the notebook computer is example, network is avoided antenna to expose and is damaged easily, and for the purpose of the overall space design, generally all antenna is embedded in the notebook computer display screen, and antenna is welded on frame closes on the metal edge frame of display panels, to utilize metal edge frame to be used as ground plane and to provide support the function of antenna simultaneously.

As shown in Figure 1, this antenna can be a flat and inverted-F antenna (PIFA) 8, or a slot antenna (slot antenna), and can be arranged on around the metal edge frame 71 of notebook computer 7, yet but there are several shortcomings in this kind antenna: at first.By what with 8 solid weldings of this kind antenna on metal edge frame 71, and with signal feed-in line (scheming not shown) when coupling mutually, need artificial fine manipulation.But, still cause the reduction of yield unavoidably because of whole contraposition is difficult for.In addition, owing to the antenna of commonly using only designs at single frequency band.2.4GHz for example, and the standard that only can meet 802.11b can't be covered by 802.11a, as everyone knows, though the modulation mode of 802.11b and 802.11a is also inequality, but if antenna can be contained two kinds of frequency ranges simultaneously, then can strengthen designer or the user elasticity on selectivity, and make the wireless communication capability that electronic installation can possess simultaneously to be had under 802.11a and the 802.11b standard.

In addition, the above-mentioned 802.11b of according with standard commonly use antenna, its detailed content has been disclosed in the 6th, 339, No. 400 patents of the U.S., at this it is incorporated in this as the reference data.

(3) summary of the invention

Therefore, the purpose of this invention is to provide the multifrequency antenna that a kind of modularity and its frequency range can be contained the portable electronic devices of what 2.4GHz and 5.15GHz frequency range simultaneously.

So in a preferred embodiment, the multifrequency antenna of portable electronic devices of the present invention comprises a substrate, a width of cloth is penetrated element, a grounding metal plane, a little band metal wire and a transmission line.

Substrate is a printed circuit board (PCB), and has one first opposite basal plane and one second basal plane.Radiant element is a planar inverted F-antenna and is arranged on this first basal plane.Grounded metal but be provided with on this second basal plane of what and with this radiant element connects mutually.Little band metal wire is to be arranged on this second basal plane with this grounding metal plane danger spot that is separated by, and an end of little band metal wire also connects mutually with this radiant element on being positioned at first basal plane.

Transmission line has one in order to carry first conducting part of an electromagnetic wave signal, and one and the second mutually electrically isolated conducting part of this first conducting part, this first conducting part is to connect mutually with the other end of this little band metal wire, and your second conducting part is to connect mutually with this grounding metal plane, and the two is grounded to make this radiant element and this little band metal wire.

So nationality connects a radio circuit by first conducting part of transmission line, and carry an electromagnetic wave signal to little band metal wire and radiant element, to carry out the radio magnetic wave signal transmitting and receiving of multifrequency.

For clearer understanding purpose of the present invention, characteristics and advantage, purpose of the present invention, characteristics and advantage are elaborated below in conjunction with accompanying drawing.

(4) description of drawings

Fig. 1 is a schematic diagram, illustrates to commonly use in the display that antenna is arranged at a portable electronic devices;

Fig. 2 is a schematic diagram, illustrates that multifrequency antenna of the present invention is arranged at the situation in the portable electronic devices;

Fig. 3 is a front elevational schematic, and a preferred embodiment of this multifrequency antenna is described;

Fig. 4 is a dorsal view of this preferred embodiment;

Fig. 5 is the cutaway view along V among Fig. 4-the V hatching is looked;

Fig. 6 is voltage standing wave ratio (VSWR) figure of this preferred embodiment;

Fig. 7 is the directivity pattern of this preferred embodiment in the 2.45GHz horizontal polarization directions;

Fig. 8 is the directivity pattern of this preferred embodiment in the 2.45GHz vertical polarization directions;

Fig. 9 is the directivity pattern of this preferred embodiment in the 5.25GHz horizontal polarization directions; And

Figure 10 is the directivity pattern of this preferred embodiment in the 5.25GHz vertical polarization directions.

(5) embodiment

Consult Fig. 2, what will illustrate earlier is, hereinafter described portable electronic devices 6, be meant a notebook computer in the present embodiment, and nationality is by the setting of multifrequency antenna of the present invention, and can make portable electronic devices 6 possess simultaneously has the ability of the electromagnetic wave signal of transmitting-receiving 802.11a, 802.11b standard.Certainly, in radio area network, the applicable portable electronic devices of the present invention can also be PDA(Personal Digital Assistant), panel computer (table PC), desktop computer (pocket PC) etc., and not only with this

Exceed shown in the embodiment.

Consult Fig. 3 and 4, the preferred embodiment of the multifrequency antenna 100 of portable electronic devices of the present invention comprises a substrate 1, a radiant element 2, one little band metal wire 3, a grounding metal plane 4, and a transmission line 5.

Substrate 1, in the present embodiment, be meant a printed circuit board (PCB), it also has one first basal plane 11, and second basal plane 12 opposite with first basal plane 11, on basic meal 1 and be formed with one first perforation 13 (via hole) and one second perforation 14 that runs through this first basal plane 11 and second basal plane 12, along being coated with a metal level in the internal face of this

perforation

13,14, so can make win basal plane 11 and second basal plane, 12 mutual conduction.In addition, substrate 1 also has two screws 15, is used for substrate 1 spiral shell solid in the display 61 of portable electronic devices 6.

Radiant element 2 is arranged on this first basal plane 11, be meant plane inverse-F shape (PIFA) antenna in the present embodiment, and can be divided into two one first antenna part 21, one second antenna parts 22 that parallel, an and third antenna portion 23 that connects first antenna part 21 and second antenna part 22, wherein, one end of first antenna part 21 connects with little band metal wire 3 mutually by first perforation 13, and an end of second antenna part 22 connects with grounding metal plane 4 mutually by second perforation 14.Wherein, first, second antenna part the 21, the 22nd be used for carrying out electromagnetic transmitting-receiving, and third antenna portion 23 is 50 Ω impedance matchings as following transmission line 5, to reach maximum power transfer, to reduce signal reflex.

Consult Figure 4 and 5, little band (micro-strip) metal wire 3 i.e. a thin long metal sheet, is to be arranged on this second basal plane 12.And have certain length and width, for example Zui Jia length is that 4-10mm, best width are 0.75mm, can be used for carrying out the transmitting-receiving of radio magnetic wave.Little band metal wire 3 also has first end 31 that connects mutually with first antenna part 21, and second end 32, the first ends 31 opposite with first end 31 and be to connect mutually with first antenna part 21 by first perforation 13.

Grounding metal plane 4, promptly a thin metal reaches, and is to be arranged on this second basal plane 12 and with little band metal wire 3 electrically to completely cut off mutually, as shown in the figure.It is to surround little band metal wire 3 and connect mutually with second antenna part 22 of this radiant element 2 by second perforation 14 that ground connection is adhered to face 4 separately, is used as the ground plane of little band metal wire 3 and radiant element 2.

Transmission line 5 promptly refers to a coaxial line (coaxial cable), have one in order to carry first conducting part 51 of an electromagnetic wave signal, and one and second electrically isolated mutually conducting parts 52 of this first conducting part 51, this first conducting part 51 promptly refers to the inner conductor (Inner conductor) of coaxial line, and second transport unit promptly refers to outer contact (outer conductor).This first conducting part 51 is to weld and conducting mutually with second end 32 of this little band metal wire 3, and this second conducting part 52 is to weld and conducting mutually with this grounding metal plane 4, make the width of cloth penetrate element 2 and be grounded that little band metal wire 3 also is grounded by radiant element 2 by second antenna part 22.

Certainly, transmission line 5 is to couple mutually with the radio circuit of portable electronic devices away from the other end of substrate 1, by this non-emphasis of the present invention of what, so do not add to give unnecessary details at this.But person skilled in the art person should be appreciated that, be provided with by each above-mentioned member, when radio circuit transmits an electromagnetic wave signal (high-frequency current), first conducting part 51 by transmission line 5 is carried on little band metal wire 3, makes little band metal wire 3, radiant element 2 produce high-frequency resonance, so send electromagnetic wave signal, otherwise, when the present invention receives electromagnetic wave, promptly receive the electromagnetic wavelength of λ/4, and the generation induced current is sent on first conducting part 51 with little band metal wire 3, radiant element 2.

Consult Fig. 6, scheme the present invention as can be known on the frequency band of 2.4GHz, 5.15HHz by VSWR, its S WR is all below 2, and frequency range respectively is 83.5MHz, 200MHz, so contain the frequency range of what 802.11a, 802.11b institute standard simultaneously.Other consults Fig. 7 to Figure 10.On directive property, because radio area network is many indoor, so though less demanding for directive property, no matter the present invention is the frequency range at 2.4GHz or 5.15GHz, the directive property of each angle also all can satisfy user's demand, is not limited in single polarised direction.

What need one were carried in addition is, above-mentioned radiant element 2, little band metal wire 3, grounding metal plane 4 etc., in fact be to adopt exposure, development, etched processing procedure, make each metalwork shape can by correctly, apace on the moulding what circuit board, so the present invention can be with a large amount of outputs of modular mode.

Conclude above-mentioned, the multifrequency antenna 100 of portable electronic devices of the present invention, except the frequency range of the 802.11a that can contain what and 802.11b institute standard, owing to be on the moulding what circuit board, so when circuit board is fixed in the display 61, transmission line 5 just can accurately be welded on little band metal wire 3 and the grounding metal plane, exempts the shortcoming that what is commonly used antenna.

Discussed above is only for preferred embodiment of the present invention, and when can not limiting scope of the present invention with this, the variation or the replacement of all equivalences of having done according to spirit of the present invention all should be included in the claim institute restricted portion.

Claims

1. the multifrequency antenna of a portable electronic devices is characterized in that, comprising:

One substrate has one first opposite basal plane and one second basal plane;

One radiant element is arranged on this first basal plane;

One little band metal wire is arranged on this second basal plane, and connects mutually with this radiant element:

One grounding metal plane is arranged on this second basal plane with this little band metal wire danger spot that is separated by, and penetrates element with this width of cloth and connect mutually; And

One transmission line, have one in order to carry first conducting part of an electromagnetic wave signal, and one and the second mutually electrically isolated conducting part of this first conducting part, this first conducting part is to connect mutually with this little band metal wire, and this second conducting part is to connect mutually with this grounding metal plane, and the two is grounded to make this radiant element and this little band metal wire.

2. the multifrequency antenna of portable electronic devices as claimed in claim 1 is characterized in that, this radiant element is a planar inverted F-antenna

3. the multifrequency antenna of portable electronic devices as claimed in claim 1 is characterized in that, this transmission line is a coaxial line.

4. the multifrequency antenna of portable electronic devices as claimed in claim 1, it is characterized in that, this little band metal wire has one first end, and second end opposite with this first end, this first end is to couple mutually with this radiant element, and this second end is to couple mutually with first conducting part of this transmission line.

5. the multifrequency antenna of portable electronic devices as claimed in claim 1 is characterized in that, this substrate is a printed circuit board (PCB).

The multifrequency antenna of 6 portable electronic devices as claimed in claim 1, it is characterized in that, this substrate also has one first perforation and one second perforation that runs through this first basal plane and this second basal plane, this first perforation is to make this little band metal wire and this width of cloth penetrate element to electrically connect mutually, and this second perforation is that this radiant element and this grounding metal plane are electrically connected mutually.

7. the multifrequency antenna of portable electronic devices as claimed in claim 1, it is characterized in that, this portable electronic devices has a display, this substrate is arranged in this display, this first conducting part connects mutually with a radio circuit, described radio circuit be arranged at one with body that this display is connected in.

8. the multifrequency antenna of portable electronic devices as claimed in claim 7 is characterized in that, it is a planar inverted F-antenna that this width of cloth is penetrated element.

9. the multifrequency antenna of portable electronic devices as claimed in claim 7 is characterized in that, this transmission line is a coaxial line.

10. the multifrequency antenna of portable electronic devices as claimed in claim 7, it is characterized in that, this little band metal wire has one first end, and second end opposite with this first end, this first end is to couple mutually with this radiant element, and this second end is to couple mutually with first conducting part of this transmission line.

11. the multifrequency antenna of portable electronic devices as claimed in claim 7 is characterized in that, this substrate is a printed circuit board (PCB).

12. the multifrequency antenna of portable electronic devices as claimed in claim 7 is characterized in that, this substrate also has one first perforation and one second perforation that runs through this first basal plane and this second basal plane.This first perforation is that this little band metal wire and this radiant element are electrically connected mutually, and this second perforation is that this radiant element and this grounding metal plane are electrically connected mutually.

13. the multifrequency antenna of portable electronic devices as claimed in claim 7 is characterized in that, this substrate also has several screws, and is solid in this display by spiral shell for this substrate.