CN2896555Y

CN2896555Y - Three-frequency PIFA antenna adopting reverted vibrator

Info

Publication number: CN2896555Y
Application number: CNU2006200720997U
Authority: CN
Inventors: 李武
Original assignee: Mitac Precision Technology Kunshan Ltd
Current assignee: Mitac Precision Technology Kunshan Ltd
Priority date: 2006-03-31
Filing date: 2006-03-31
Publication date: 2007-05-02
Anticipated expiration: 2016-03-31

Abstract

The utility model relates to a three-frequency PIFA antenna adopting hollow-shaped oscillators. The antenna at least comprises a ground plate, a first, second and third oscillators arranged in parallel on one side of the plate. The first and second oscillators are in the same plane but not in the same as the third oscillator. Besides, a first connecting unit and a second connecting unit are respectively arranged between the ground plate and the third oscillator, and between the third oscillator and second oscillator. The third oscillator comprises a first through unit connected with the connecting unit, a first subject and a second subject connected with one side of the first through unit, as well as the bending unit connecting the first and second subjects. Therein, one end of the first subject is connected with the second through unit, and the other end is bent to have a bending unit. At the end of the bending unit is the second subject which is bent in parallel to the first subject. The third oscillator of the utility model is bent into a hollow shape, thereby reducing the size and enabling a simple structure.

Description

Adopt back three frequency PIFA antennas of type oscillator

[technical field]

The utility model relevant a kind of three is the PIFA antenna frequently, and three frequency PIFA antennas of type oscillator are returned in particularly a kind of employing.

[background technology]

At present, communication product on the market has the trend of microminiaturization gradually, and as the microminiaturization of mobile phone, and communication product is also integrated with other electronic product gradually, for example, communication device is installed in notebook computer, personal digital assistant etc.When this extra device was installed in electronic product, being bound to will be with its microminiaturization.

Development trend in the face of mechanics of communication has a key factor must include consideration, i.e. antenna in.Because along with the microminiaturization of communication device, inevitably, the design of antenna is microminiaturization correspondingly also.And on the other hand, along with WLAN (wireless local area network) (Wireless Local Access Net, WLAN) extensive use in modern mobile office environment, the antenna that is installed on the portable communication apparatus (for example notebook computer) is able to a large amount of uses, and the main flow wireless LAN communication agreement of Chan Shenging mainly comprises IEEE802.11b and two kinds of standards of IEEE802.11a thereupon, wherein the IEEE802.11b working frequency range is mainly 2.4-2.5GHz, and the IEEE802.11a working frequency range is contained 5.15-5.825GHz, mainly comprise 5.15-5.25GHz, 5.25-5.35GHz, 5.725-5.825GHz.Because along with the microminiaturization of communication device, inevitably, the design of antenna is microminiaturization correspondingly also.And the solution of antenna microminiaturization in the middle of prior art, has become ripe development field.

In order to make that communication apparatus can compatible IEEE802.11a and two kinds of standards of IEEE802.11b, need to use double frequency or multifrequency antenna, planar inverted F-shape antenna (Planar Inverted-F Antenna, PIFA) be a kind of miniaturization built-in aerial that is applicable to mobile terminals commonly used, at present, structure, the kind of planar inverted F-shape antenna are a lot, but dual-band antenna is limited to the narrow and small restriction in mechanism space of portable communication apparatus mostly, and sacrifice gain and bandwidth.The entire antenna industry does not all influence under the prerequisite of antenna gain in lasting pursuit at present, the reduction antenna size.

In view of this, be necessary to provide a kind of volume less, simple in structure in fact, and cover three frequency PIFA antennas of IEEE802.11a and two frequency ranges of IEEE802.11b fully.

[summary of the invention]

Therefore, the purpose of this utility model is to provide a kind of employing to return three frequency PIFA antennas of type oscillator, and this antenna has less, the characteristic of simple structure of volume.

For reaching above-mentioned purpose, the three frequency PIFA antennas that the type oscillator is returned in employing of the present utility model comprise ground plate at least, parallel first, second, third oscillator that is mounted on this ground plate one side, and this first, second oscillator coplane and with the 3rd oscillator antarafacial, and between this ground plate and the 3rd oscillator, be respectively equipped with first, second connecting portion between the 3rd oscillator and second oscillator, and this first, second connecting portion connects ground plate and the 3rd oscillator and the 3rd oscillator and second oscillator respectively.Wherein, the 3rd oscillator comprises first interconnecting part that is communicated with above-mentioned first connecting portion, first body that is connected in this first interconnecting part, one side, second body and the kink that is communicated with above-mentioned first body and second body, wherein, this first body, one end is communicated with second interconnecting part, and other end bending is provided with kink, parallel second body that is bent with of the end of this kink with first body, so, first interconnecting part of the 3rd oscillator, first body, kink and second body become " return " the shape structure.

Compared to prior art, the 3rd oscillator of the present utility model is bent into " return " the shape structure, make the length overall of this antenna shorten more than 30%, volume is scaled-back also; And the utility model can be by the sheet metal punch forming, therefore have simple in structure, the characteristics that are easy to make.

[description of drawings]

Fig. 1 returns the schematic perspective view of three frequency PCB antennas of type oscillator for employing of the present utility model.

Fig. 2 returns the three voltage standing wave ratio curves of measuring when frequently the PCB antennas work in IEEE802.11b and IEEE802.11a frequency range of type oscillator for employing of the present utility model.

[embodiment]

See also Fig. 1, return the three-dimensional structure diagram of three frequency PIFA antennas of type oscillator for employing of the present utility model, as shown in the figure, this antenna comprises ground plate 10 at least, parallel first of these ground plate 10 1 sides that are mounted on, second, the 3rd oscillator 21,22,23, and this is first years old, second oscillator 21,22 coplanes and with the 3rd oscillator 23 antarafacials, and between this ground plate 10 and the 3rd oscillator 23, be respectively equipped with first between the 3rd oscillator 23 and second oscillator 22, second connecting portion 30,31, and this first, second connecting portion 30,31 vertical respectively ground plate 10 and the 3rd oscillator 23 and the 3rd oscillator 23 and second oscillators 22 of connecting.

Please continue to consult Fig. 1, the 3rd oscillator 23 comprises first interconnecting part 234 that is connected with above-mentioned first connecting portion 30, be connected in first body 231 of these first interconnecting part, 234 1 sides, second body 233 and the kink 232 that is communicated with above-mentioned first body 231 and second body 233, wherein, this first interconnecting part 234 is be arranged in parallel with ground plate 10 by first connecting portion, 30 ends, and this first interconnecting part, 234 1 sides are extended first body 231 parallel with ground plate 10, this first body, 231 other ends bending is provided with kink 232, the end of this kink 232 and first body 231 parallel second body 233 that is bent with on same plane, so, first interconnecting part 234 of the 3rd oscillator 23, first body 231,233 one-tenth one of the kink 232 and second bodies " return " the shape structure.

Again, these first interconnecting part, 234 ends are with vertical and be provided with second connecting portion 31 away from the direction bending of ground plate 10, the end of this second connecting portion 31 and ground plate 10 are parallel is provided with one second interconnecting part 24, these second interconnecting part, 24 two ends are extended with first oscillator 21, second oscillators 22 parallel with ground plate 10 and that length is different, and leave a slit 25 between this first, second oscillator 21,22.In addition, the length difference of this first, second, third oscillator 21,22,23 is represented the frequency range difference of its electric field that agitates formation.In present embodiment, thereby produce the resonance electric field between first oscillator 21 and the ground plate 10 and agitate the signal that forms (5.725GHz-5.825GHz) in the IEEE802.11a frequency range, thereby form the resonance electric field in the slit between second oscillator 22 and the ground plate 10 and agitate (5.15GHz-5.35GHz) signal that produces in the IEEE802.11a frequency range, agitate (2.4GHz-2.5GHz) signal that produces in the IEEE802.11b frequency range thereby form the resonance electric field in the slit between the 3rd oscillator 23 and the ground plate 10.In addition, because the size of passband is relevant with the width and the gap length of oscillator, therefore the width by changing first, second, third oscillator 21,22,23 and and first, second, third oscillator 21,22,23 and ground plate 10 between gap length can realize the variation of this beamwidth of antenna and gain, help widening the bandwidth of operation of this antenna like this.Simultaneously, these ground plate 10 both sides relative positions extend respectively and are bent into an assembled portion 11, offer an assembly hole 12 in this assembled portion 11, with cooperate screw (not illustrating) with this antenna mount on casing.

In addition, antenna of the present utility model also comprises a feeder line 40, and this feeder line 40 comprises internal core wire 41 and screen 42 for the coaxial cable structure, and between this internal core wire 41 and the screen 42, and all include an insulating barrier between the screen 42 and the external world around it.In present embodiment, an end of this internal core wire 41 is electrically connected on above-mentioned first oscillator 21, and the microwave receiving on the other end of above-mentioned internal core wire 41 and the communication terminal/ballistic device electrically connects; One end of this screen 42 is electrically connected on the above-mentioned ground plate 10, and the other end of this screen 42 and the ground connection device on the communication terminal electrically connect.Simultaneously the link position of internal core wire 41 and first oscillator 21 can be different and finely tune in very little scope regulating the impedance matching of this antenna according to the mechanism of the actual use of feed-in, thereby can improve the effect of this antenna structure of use.

Please refer to shown in Figure 2, return voltage standing wave ratio (the Voltage Standing Wave Ratio of three frequency PCB antennas of type oscillator for employing of the present utility model, VSWR) measure curve, in IEEE802.11b frequency range (2.4GHz-2.5GHz) and IEEE802.11a frequency range (5.15GHz-5.35GHz) and (5.725GHz-5.825GHz) in the scope, employing of the present utility model return the type oscillator three frequently the value of the voltage standing wave ratio that records of PCB antennas all less than 2, promptly show employing of the present utility model return the type oscillator three frequently the working band of PCB antennas satisfy the requirement of industry fully to the voltage standing wave ratio of three-frequency antenna.

Compared to prior art, the 3rd oscillator of the present utility model is bent into one " return " the shape structure, make the length overall of this antenna shorten more than 30%, volume is scaled-back also; And the width that this oscillator changes first, second, third oscillator is the bandwidth of operation and the gain size of this antenna of scalable, helps improving its bandwidth of operation like this; Again, the utility model can be by the sheet metal punch forming, therefore have simple in structure, the characteristics that are easy to make.

Claims

1, three frequency PIFA antennas of type oscillator are returned in a kind of employing, at least comprise ground plate, parallel first, second, third oscillator that is mounted on this ground plate one side, and this first, second oscillator coplane and with the 3rd oscillator antarafacial, it is characterized in that: the 3rd oscillator comprises first body, second body and the kink that is communicated with above-mentioned first body and second body, wherein, this first body, one end is communicated with second interconnecting part, and other end bending is provided with kink, the end of this kink and first body parallel second body that is bent with on same plane.

2, three frequency PIFA antennas of type oscillator are returned in employing as claimed in claim 1, it is characterized in that: between this ground plate and the 3rd oscillator, be respectively equipped with first, second connecting portion between the 3rd oscillator and second oscillator, and vertical respectively ground plate and the 3rd oscillator and the 3rd oscillator and second oscillator of connecting of this first, second connecting portion.

3, three frequency PIFA antennas of type oscillator are returned in employing as claimed in claim 1, and it is characterized in that: this first interconnecting part be arranged in parallel with ground plate by first connecting portion is terminal, and this first interconnecting part, one side is extended first body parallel with ground plate.

4, three frequency PIFA antennas of type oscillator are returned in employing as claimed in claim 3, it is characterized in that: this first interconnecting part end is with vertical and be provided with second connecting portion away from the direction bending of ground plate, and the end of this connecting portion is parallel with ground plate is provided with one second interconnecting part.

5, three frequency PIFA antennas of type oscillator are returned in employing as claimed in claim 4, and it is characterized in that: these second interconnecting part two ends are extended with first oscillator, second oscillators parallel with ground plate and that length is different, and leave a slit between this first, second oscillator.

6, three frequency PIFA antennas of type oscillator are returned in employing as claimed in claim 1, it is characterized in that: agitate the signal that forms (5.725GHz-5.825GHz) in the IEEE802.11a frequency range thereby produce the resonance electric field between first oscillator and the ground plate, thereby form the resonance electric field in the slit between second oscillator and the ground plate and agitate (5.15GHz-5.35GHz) signal that produces in the IEEE802.11a frequency range, agitate (2.4GHz-2.5GHz) signal that produces in the IEEE802.11b frequency range thereby form the resonance electric field in the slit between the 3rd oscillator and the ground plate.

7, three frequency PIFA antennas of type oscillator are returned in employing as claimed in claim 1, and it is characterized in that: this ground plate both sides relative position extends respectively and is bent into an assembled portion, offers an assembly hole in this assembled portion.