CN101071901B

CN101071901B - Multi frequency antenna

Info

Publication number: CN101071901B
Application number: CN2006100404104A
Authority: CN
Inventors: 洪振达; 柯云龙; 谷柏冈
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: 2006-05-10
Filing date: 2006-05-10
Publication date: 2012-02-08
Anticipated expiration: 2026-05-10
Also published as: CN101071901A

Abstract

The invention is a multi-frequency antenna for mobile electronic devices, able to be work in both WWAN and GPS, and comprising: T-shaped PCB, first antenna main body arranged on one surface of the PCB and second antenna main body arranged on the other surface of the PCB, where the radiating parts of the first and second antenna main bodies have the same structure and are symmetrically arranged on the two surface of the PCB with respect to the PCB, and the feed point and grounded point positions of the two main bodies are equipped with electric through hole of connecting the two main bodies. And the antenna uses a double-layer antenna main body structure to make it have wider frequency range and better radiating strength.

Description

Multifrequency antenna

[technical field]

The invention relates to a kind of multifrequency antenna, refer to especially a kind of planar inverted " F " type multifrequency antenna that is used for electronic apparatus (Planar Inverted-F Antenna, PIFA).

[background technology]

Along with making rapid progress of modern communication technology, increasing mobile electronic equipment such as notebook computer etc. all are equipped with antenna, so that it can insert a wireless lan (wlan) job.At present, wireless local area is the row standards based on bluetooth (Bluetooth) technical standard or I EEE802.11 mostly.The working band of antenna falls within 2.4GHz in the Bluetooth technology standard, and IEEE802.11 is that the working band of antenna in the row technical standard falls within 2.4GHz and 5GHz respectively.Therefore, the antenna in the present notebook computer is the antenna that is applied to above-mentioned frequency band mostly.

Yet; People do not satisfy and electronic equipment is only inserted one can not move that (the signal maximum transmission distance has only 10 meters in the Bluetooth technology; Allow inserting this hardly is that the electronic equipment of system moves) or moving range very little (I EEE802.11 is that signal transmission ultimate range also has only 150 meters in the row standard, only limit to office between move) WLAN.Mobile electronic equipment is inserted WWAN (WirelessWide Area Network, wireless wide area network) and GPS (Global Positioning System, global positioning system) is the target that people pursue.Insert mobile office, amusement that the mobile electronic equipment of WWAN and GPS can be wider.The WWAN in the whole world mainly adopts two big technology at present---and be respectively GSM and CDMA technology.And to make mobile electronic equipment such as notebook computer can insert the GSM network, the antenna of using in the notes type just must be able to work in the frequency band of GSM network work, i.e. 900/1800MHz.And the GPS working band is 1.575GHz.The laptop computer applications antenna only works in WLAN mostly at present; WWAN or GPS; If can work in above-mentioned three kinds of environment simultaneously, just three groups of antennas that work in above-mentioned environment respectively must be installed, this is originally very difficult with regard to narrow and small mobile electronic equipment for the inner space; And too much antenna not only influences operate as normal each other, and has increased the cost of mobile electronic equipment.

Therefore, be necessary to improve existing antenna, to solve above-mentioned defective of the prior art.

[summary of the invention]

The purpose of this invention is to provide a kind of multifrequency antenna, it makes multifrequency antenna have wideer frequency band, bigger radiation intensity through the board-like Antenna Design of bilayer.

For realizing above-mentioned purpose, multifrequency antenna of the present invention adopts following technical scheme:

A kind of multifrequency antenna is used for mobile electronic equipment, and it comprises: PCB which is provided with through hole; First antenna body is located at the surface of PCB, and it has first grounding parts that first Department of Radiation and first Department of Radiation are provided with at interval; Second antenna body is located at another surface of PCB, and it has second Department of Radiation, second grounding parts and is connected second Department of Radiation and the connecting portion of second grounding parts; The last through hole of PCB can electrically connect first antenna body and second antenna body.

For realizing above-mentioned purpose, the present invention also can adopt following technical scheme:

A kind of multifrequency antenna; Be used for mobile electronic equipment; It comprises: be provided with through hole PCB, be located at PCB one surface first antenna body with first Department of Radiation, be located at second antenna body on another surface of PCB and have inner wire and the feeder line of outer conductor; Said second antenna body has second Department of Radiation, second grounding parts and is connected second Department of Radiation and the connecting portion of second grounding parts; The through hole of being located on the above-mentioned PCB can electrically connect first Department of Radiation and second Department of Radiation, this first Department of Radiation and second Department of Radiation additional band that resonates out each other.

Compared with prior art; The advantage of multifrequency antenna of the present invention is: make the multifrequency antenna additional band that resonates out through dual-layer atenna body and the Department of Radiation design symmetrical with respect to PCB, thereby widen the emission band of multifrequency antenna and have better radiating strength saving under the prerequisite of space.

[description of drawings]

Fig. 1 is the stereogram of multifrequency antenna of the present invention.

Fig. 2 is the stereogram of another angle of Fig. 1.

Fig. 3 is the voltage standing wave ratio figure of multifrequency antenna of the present invention.

[embodiment]

Illustrated in figures 1 and 2 is the embodiment of multifrequency antenna 1 of the present invention; In this execution mode; Multifrequency antenna 1 can work in simultaneously WWAN (work in 824～960MHz and 1710～2170MHz) and GPS (working in 1575MHz), first antenna body (not label) that it comprises T type PCB (printed circuit board (PCB)) 2, be formed at PCB 2 one surfaces be formed at PCB 2 another surperficial second antenna bodies (not label).

First antenna body comprises first Department of Radiation 3 of the first half that is positioned at T type PCB 2 and is positioned at the latter half of T type PCB 2 and first grounding parts 71 that breaks off in PCB 2 the same sides with first Department of Radiation 3.Certainly, present embodiment makes win Department of Radiation 3 and 71 disconnections of first grounding parts, if first Department of Radiation 3 and first grounding parts 71 are electrically connected the operate as normal that can't influence multifrequency antenna of the present invention in the same side for better impedance matching.First Department of Radiation 3 comprise be " コ " type work in low frequency (824～960MHz) first radiation arm 31 with work in high frequency (1710～2170MHz) second radiation arm 32.A feeder line access portion 5 is extended towards first grounding parts 71 in first radiation arm 31 and second radiation arm, 32 junctions.First radiation arm 31, second radiation arm 32 and feeder line access portion 5 junctions are provided with a through hole 8, and this through hole 8 vertically connects first antenna body, PCB 2 and second antenna body from top to bottom.

First radiation arm 31 comprises that the first 311 that is connected with second radiation arm 32, spaced and parallel are in the second portion 312 of first 311 and connect first 311 and second portion 312 and perpendicular to the third part 313 of first 311 and second portion 312.The terminal part 322 that second radiation arm 32 comprises that the first 311 with first radiation arm 31 is positioned at same straight line and the reverse main part 321 that extends and continues from main part 321 to extend.Terminal part 322 rectangular triangle and tip broads, it passes through to increase swept area with the increase signal transmission path, thereby reaches the purpose that increases frequency range.

First grounding parts 71 comprises rectangle lamellar body 711 and is parallel to the first 311 of first radiation arm 31 with respect to first radiation arm, 31 1 sides and to the arrowband 712 that extends away from second radiation arm, 32 directions from rectangle lamellar body 711.One jiao of fritter that excises of arrowband 712 and rectangle lamellar body 711 vicinity feeder line access portions 5 is that present embodiment multifrequency antenna 1 is in order to reach the improvement that better radiativity the subject of knowledge and the object of knowledge is done.Rectangle lamellar body 711 is provided with some through holes 8, and these through holes 8 vertically connect first antenna body, PCB 2 and second antenna body from top to bottom.

One feeder line (not shown) has inner wire and outer conductor, and its inner wire is electrically connected at above-mentioned feeder line access portion 5, and outer conductor is electrically connected at above-mentioned first grounding parts 71.

Second antenna body comprise the first half of being positioned at T type PCB 2 second Department of Radiation 4, be positioned at the latter half of T type PCB2 and second grounding parts 72 and the connecting portion 9 that is connected second Department of Radiation 4 and second grounding parts 72 that is provided with at interval with second Department of Radiation 4.Second Department of Radiation 4 and second grounding parts, 72 structures and function and first Department of Radiation 3 and first grounding parts 71 are basic identical; Second Department of Radiation 4 comprises the 3rd radiation arm 41 and the 4th radiation arm 42 that works in high frequency that works in low frequency, is not giving unnecessary details its detailed structure here.

Connecting portion 9 comprise perpendicular to first 91 of second grounding parts 72, from the 3rd Department of Radiation 41 extend with the 4th Department of Radiation 42 junctions and be parallel to first 91 second 92 be connected first 91 and second 92 and perpendicular to first 91 and second 92 the 3rd 93.Connecting portion 9, the 3rd Department of Radiation 41 and the 4th Department of Radiation 42 junctions offer a through hole 8, and this through hole 8 vertically connects first antenna body, PCB 2 and second antenna body from top to bottom.

Certainly, above-mentioned feeder line can also move on to second antenna body, one side, and its inner wire and connecting portion second 92 and the 3rd 93 junction electrically connect, and its outer conductor and second grounding parts 72 electrically connect.

Multifrequency antenna 1 of the present invention need to prove the operate as normal that only adopts a grounding parts also can not influence multifrequency antenna of the present invention in order to have preferably the ground connection effect and adopt two grounding parts 71,72.

First grounding parts 71 and second grounding parts 72 are provided with more through hole, and first grounding parts 71 and second grounding parts 72 are better electrically connected.

Please refer to shown in Figure 3ly, it is VSWR (voltage standing wave ratio) figure of multifrequency antenna 1 of the present invention, can see from this figure, and multifrequency antenna 1 also has good radiance at the 1575MHz frequency band of GPS work.This is because multifrequency antenna 1 of the present invention has two high-frequency radiation part being located at the PCB both sides: second radiation arm 32 and the 3rd radiation arm 42.Resonance each other between these two high-frequency radiation part makes multifrequency antenna near 1.5GHz, resonate and produces the required operating frequency of GPS.Thereby make multifrequency antenna 1 can work in WWAN and GPS simultaneously.Can also see from Fig. 3; Multifrequency antenna 1 of the present invention can better work in low-frequency range (most of frequency range of 824～960MHz) of WWAN demand; Because the terminal swept area of two above-mentioned high frequency radiation portions resonance and two high frequency radiation portions increases; Multifrequency antenna high band of the present invention has the frequency band of non-constant width, can well work from 1400-2200MHz, and this frequency range has contained the high band of WWAN and the frequency range of GPS work fully.

Multifrequency antenna 1 of the present invention is because of having the dual-layer atenna body, and the antenna that is affixed on PCB 2 with respect to the individual layer antenna body has bigger radiation intensity.As everyone knows; The area of aerial radiation portion ingress of air medium is big more, and its radiation intensity is just big more, has only the individual layer antenna body to be affixed on the antenna of PCB 2; Its Department of Radiation one side contacts with air; And another side contacts with PCB 2, thereby it is abundant inadequately to make that Department of Radiation contacts with air, influences its radiation intensity.And first antenna body and second antenna body of multifrequency antenna 1 of the present invention because of having the symmetrically arranged PCB2 of being positioned at two sides, thereby make the gross area of multifrequency antenna 1 Department of Radiation ingress of air increase greatly, and have better radiating strength.

In the present embodiment, second Department of Radiation 4 and first Department of Radiation 3 are identical, and are symmetrically formed in PCB 2 both sides with respect to PCB 2 mirror images.Should be noted that first Department of Radiation 3 that all works in low frequency first radiation arm 31 and second Department of Radiation 4 the 3rd radiation arm 41 not mirror image be symmetrical set the operate as normal that also can not influence multifrequency antenna of the present invention and realize the bigger characteristic of radiation intensity; And second radiation arm 32 and the 4th radiation arm 42 sides of second Department of Radiation 4 that all work in first Department of Radiation 3 of high frequency will reach the mirror image symmetry basically; If deviation is bigger; To be difficult to make two high-frequency radiation part 1.5GHz frequency band that resonates out, or the 1.5GHz frequency band that resonates out is very narrow.

Claims

1. multifrequency antenna; Be used for mobile electronic equipment; It comprises: be provided with the PCB of a plurality of through holes and be positioned at first antenna body on the surface of PCB, first grounding parts that said first antenna body has first Department of Radiation and is provided with at interval with first Department of Radiation and breaks off each other; It is characterized in that: said multifrequency antenna comprises that also one is positioned at second antenna body on another surface of PCB; This second antenna body has with second Department of Radiation, second grounding parts of first Department of Radiation symmetry and is connected second Department of Radiation and the connecting portion of second grounding parts; Through hole on the above-mentioned PCB electrically connects first Department of Radiation and second Department of Radiation, first grounding parts and second grounding parts respectively; Second Department of Radiation and the connecting portion junction of said second antenna body are provided with a through hole; This through hole electrically connects first Department of Radiation and second Department of Radiation, and said multifrequency antenna also comprises the feeder line with inner and outer conductor, and first Department of Radiation of said first antenna body extends a feeder line access portion; The inner wire of said feeder line is electrically connected at this feeder line access portion, and the outer conductor of said feeder line is electrically connected at first grounding parts.

2. multifrequency antenna as claimed in claim 1; It is characterized in that: said first Department of Radiation comprises first radiation arm that works in low frequency and second radiation arm that works in high frequency, and second Department of Radiation comprises the 3rd radiation arm that works in low frequency and the 4th radiation arm that works in high frequency.

3. multifrequency antenna as claimed in claim 1 is characterized in that: said first grounding parts and second grounding parts electrically connect through a plurality of through holes.

4. multifrequency antenna as claimed in claim 1 is characterized in that: the contiguous high-frequency radiation part of said first and second grounding parts place's excision sub-fraction, is pasting the PCB edge and is extending an arrowband at vicinity low frequency radiation portion place.

5. a multifrequency antenna is used for mobile electronic equipment, it comprises: be provided with through hole

PCB, be located at PCB one surface first antenna body with first Department of Radiation, be located at second antenna body on another surface of PCB and have inner wire and the feeder line of outer conductor, said second antenna body has second Department of Radiation, second grounding parts and is connected second Department of Radiation and the connecting portion of second grounding parts; It is characterized in that: the through hole of being located on the above-mentioned PCB electrically connects first Department of Radiation and second Department of Radiation; This first Department of Radiation and second Department of Radiation additional band that resonates out each other; Said first Department of Radiation comprises first radiation arm that works in low frequency and second radiation arm that works in high frequency; Second radiation arm comprises that the part that links to each other with first radiation arm is positioned at same straight line and the reverse main part that extends and autonomous body and continues the terminal part that extends, and rectangular triangle of terminal part and end are wider than its front end.

6. multifrequency antenna as claimed in claim 5 is characterized in that: said first Department of Radiation and second Department of Radiation are symmetrical with respect to the PCB substantial mirror images.

7. multifrequency antenna as claimed in claim 5 is characterized in that: the inner wire of said feeder line is electrically connected at said connecting portion, and outer conductor is electrically connected at said second grounding parts.