CN2924818Y

CN2924818Y - Planar three-frequency antenna

Info

Publication number: CN2924818Y
Application number: CNU2006200688953U
Authority: CN
Inventors: 李武
Original assignee: Mitac Precision Technology Kunshan Ltd
Current assignee: Mitac Precision Technology Kunshan Ltd
Priority date: 2006-01-23
Filing date: 2006-01-23
Publication date: 2007-07-18
Anticipated expiration: 2016-01-23

Abstract

The utility model provides a plane triple-band antenna, the plane triple-band antenna is composed of a printed circuit and a feeder line, the printed circuit includes a base plate, one side of the front surface of the base plate is coated with a microstrip transmission line, one side of the microstrip transmission line is provided with two radiation oscillators whose one ends are both arranged on the microstrip transmission line, the microstrip transmission line is provided with a feed point, the base plate is penetrated through the position of the feed point, the other side of the front surface of the base plate is distributed with a plurality of guide through holes to penetrate the base plate, in the guide through holes are coated with metal, the cover guide through hole area is coated with a metal layer, on the front surface which is not coated with metal occurs a capacitance compensation film which is not electrically connected with the other parts, the back surface of the base plate is an extended ground plane which is a cover guide through the hole area. The feeder line includes an inner core line and a shielding layer, one end of the inner core line is electrically connected with the feed point, and one end of the shielding layer is electrically connected with the corresponding ground plane.

Description

The plane three-frequency antenna

[technical field]

The relevant a kind of three-frequency antenna of the utility model particularly relates to a kind of plane three-frequency antenna that is applied to WLAN (wireless local area network).

[background technology]

The wireless LAN communication agreement of carrying out mainly comprises IEEE 802.11b and two kinds of standards of 802.11a at present, and they have become present mainstream standard, and has obtained using very widely.Wherein the working frequency range of 802.11b is mainly 2.4-2.5GHz, and the working frequency range of 802.11a is mainly contained 5.15-5.35GHz.Communication device and all electronic installations are integrated in its hope.

Mechanics of communication development trend so, the inevitable microminiaturization of communication device has an important factor must include consideration in, i.e. and the design of antenna is microminiaturization correspondingly also.And the antenna microminiaturization separate the scheme of picking out, in the prior art, become ripe development field.For example, microstrip antenna, high-k antenna, slot aerial and compact spiral shape antenna are in response to the antenna microminiaturization and develop the technology that.(Planar Inverted-F Antenna PIFA) is a kind of small size antenna that is applicable to communication terminal commonly used to flat plane antenna.It has adapted to the trend of electronic installation microminiaturization and design simplification, and the demand of antenna microminiaturization.

And in order to adapt to the requirement of WLAN (wireless local area network), so, double frequency or multi-frequency plane antenna have appearred, and related art please refer to Chinese patent CN2577453Y, this utility model is a kind of double frequency or the three-frequency plane type sky of falling F money, and the mode of utilization printed circuit board (PCB) presents planar reverse F antenna; Under the spatial limitation of notebook computer or portable electronic device, this utility model sees through the design of planar reverse F antenna, and double frequency or three antenna open end is frequently calculated the resonant length of different frequency, designs the planar reverse F antenna of multiband; Open end to the equivalent length of signal feed side is 1/4 of antenna desire emission wavelength, the antenna of different frequency, its resonant length difference; And, advance to adjust the shape of open end thoroughly, can adjust the work bandwidth of antenna.

But the three-frequency plane antenna that above-mentioned patent disclosed, volume is bigger; Base areas is also less, causes radiation efficiency not enough, and it is less to gain; And it is few to have adjustment method, is difficult for debugging.

[summary of the invention]

Therefore, the purpose of this utility model just provides a kind of plane three-frequency antenna, and this antenna has the less and bigger gain of base areas of volume and is convenient to the characteristics of debugging more greatly.

For reaching above-mentioned purpose, the utility model provides a kind of plane three-frequency antenna, this plane three-frequency antenna is made up of a printed circuit and a feeder line, this printed circuit comprises a substrate, this substrate front side one side is coated with a microstrip transmission line, this microstrip transmission line one side is coated with all radiating doublets on microstrip transmission line of three one ends, there is a feedback point on this microstrip transmission line, this feedback point place penetrates substrate and gets through, the substrate front side opposite side is distributed with some vias that penetrate substrate, be coated with metal in these vias, cover the via zone and be coated with metal level, there is not a capacitance compensation sheet that does not electrically connect with other parts in plated region in the front, and the substrate reverse side is a ground plane that covers the via zone and extend.This feeder line includes internal core wire and screen, and this internal core wire one end is electrically connected on this feedback point, and this screen one end is electrically connected at corresponding ground plane place.

Especially, these via array distribution, 1/4 wavelength of this three radiating doublets corresponding first operating frequency of difference and second operating frequency and the 3rd operating frequency, in the corresponding region of reverse side, there is not ground plane in three radiating doublets in the corresponding region of substrate reverse side.

Compared with prior art, double-deck printing of the utility model plane three-frequency antenna printed circuit employing thereby volume are less; And contact area increases and extends ground, and contact area is also bigger, thereby radiation efficiency is higher, and it is bigger to gain; Increasing has the capacitance compensation sheet, is easy to regulate capacitive reactances, is convenient to debugging.

For making the purpose of this utility model, structural feature and function thereof there are further understanding, cooperate diagram to be described in detail as follows now:

[description of drawings]

Fig. 1 is the obverse and reverse view of printed circuit of a preferred embodiment of the utility model plane three-frequency antenna.

Fig. 2 is the structural representation of feeder line of a preferred embodiment of the utility model plane three-frequency antenna.

Fig. 3 is the voltage standing wave ratio test resolution of the utility model plane three-frequency antenna one preferred embodiment.

[embodiment]

Three-frequency antenna one preferred embodiment of a kind of plane of the utility model is made up of a printed circuit and a feeder line.

See also Fig. 1, Fig. 1 is the obverse and reverse view of printed circuit of a preferred embodiment of the utility model plane three-frequency antenna.

This printed circuit comprises a substrate 1, this substrate 1 positive side is coated with a microstrip transmission line 2, these microstrip transmission line 2 one sides are coated with all radiating doublets on microstrip transmission line 3 of three one ends, radiating doublet 4 and radiating doublet 5, there is feedback point 6 on this microstrip transmission line 2, these feedback point 6 places penetrate substrate 1 and get through, substrate 1 front opposite side is distributed with some vias that penetrate substrate 7, be coated with metal in these vias 7, cover via 7 zones and be coated with the extension ground 8 that metal level is a ground plane, there is not a capacitance compensation sheet 9 that does not electrically connect with other parts in plated region in the front, and substrate 1 reverse side is a ground plane 100 that covers via 7 zones and extend.

See also Fig. 2, Fig. 2 is the structural representation of feeder line of a preferred embodiment of the utility model plane three-frequency antenna.This feeder line is a coaxial cable, comprises internal core wire 10 and screen 20.And between this internal core wire 10 and the screen 20, comprise an insulating medium layer 30, between this screen 20 and the external world around it, include an insulating medium layer 40.

Please consult Fig. 1, Fig. 2 jointly, these internal core wire 20 1 ends are electrically connected on the feedback point 7, and these screen 10 1 ends are electrically connected at the ground plane place of feedback point 6 correspondences.The other end of this screen 20 and the grounding assembly on the electronic installation (not shown) electrically connect; And the other end of above-mentioned internal core wire 10 and the microwave receiving/sending assembly on the electronic installation (not shown) electrically connect.

See also Fig. 3, Fig. 3 is voltage standing wave ratio (Voltage Standing Wave Ratio, the VSWR) test resolution of the utility model plane three-frequency antenna one preferred embodiment.By among this figure as can be seen, at frequency range 2.4-2.5GHz and frequency range 5.15-5.35GHz and frequency range 5.725-5.825GHz, the voltage standing wave ratio of present embodiment three-frequency antenna (VSWR) is less than 2, so satisfy IEEE802.11b, 802.11a full frequency band consensus standard to antenna in the working frequency range scope, voltage standing wave ratio otherwise greater than 2.0 requirement.

To sum up, three-frequency antenna gain in the utility model plane can meet the requirement to antenna gain with 802.11b, 802.11a fully, and the utility model plane three-frequency antenna has the good operation bandwidth.The utility model plane three-frequency antenna is owing to adopt the low volume of printed circuit section less; And contact area is also bigger, thereby and radiation efficiency is higher with increasing extension, and it is bigger to gain; Increasing has the capacitance compensation sheet, is easy to regulate capacitive reactances, is convenient to debugging.

Claims

1, a kind of plane three-frequency antenna, it is characterized in that, this plane three-frequency antenna is made up of a printed circuit and a feeder line, this printed circuit comprises a substrate, this substrate front side one side is coated with a microstrip transmission line, this microstrip transmission line one side is coated with all radiating doublets on microstrip transmission line of two one ends, there is a feedback point on this microstrip transmission line, this feedback point place penetrates substrate and gets through, the substrate front side opposite side is distributed with some vias that penetrate substrate, is coated with metal in these vias, covers the via zone and is coated with metal level, there is not a capacitance compensation sheet in plated region in the front, and the substrate reverse side is a ground plane that covers the via zone and extend.

2, plane as claimed in claim 1 three-frequency antenna is characterized in that this feeder line includes internal core wire and screen, and this internal core wire one end is electrically connected on this feedback point, and this screen one end is electrically connected at corresponding ground plane place.

3, plane as claimed in claim 1 three-frequency antenna is characterized in that this capacitance compensation sheet does not electrically connect with other parts.

4, plane as claimed in claim 1 three-frequency antenna is characterized in that, ground plane institute elongated area covers the corresponding region of feedback point at reverse side.

5, plane as claimed in claim 1 three-frequency antenna is characterized in that there is not ground plane in three radiating doublets in the corresponding region of substrate reverse side.

6, plane as claimed in claim 1 three-frequency antenna is characterized in that these via array distribution.

7, plane as claimed in claim 1 three-frequency antenna is characterized in that, this three radiating doublet is 1/4 wavelength of corresponding first operating frequency and second operating frequency and the 3rd operating frequency respectively.

8, as claim 1, the described plane of claim 7 three-frequency antenna, it is characterized in that this first working frequency range and second working frequency range and the 3rd working frequency range are respectively 2.4-2.5GHz and 5.15-5.35GHz and 5.725-5.825GHz.