CN2865039Y

CN2865039Y - Plane bifrequency antenna

Info

Publication number: CN2865039Y
Application number: CNU2006200688949U
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: 2007-01-31
Anticipated expiration: 2016-01-23

Abstract

The utility model provides a plane dual-frequency antenna. The plane dual-frequency antenna consists of a copper-surfaced circuit and a feeding line. The copper-surfaced circuit comprises a base plate. The base plate is provided with a micro band transmission line on its front. The micro band transmission line is provided on one side with a radiation oscillator with its both ends on the micro band transmission line. The micro band line is provided with a feeder point. The feeder point breakthroughs the base plate. The base plate is provided on the other side with a plurality of through-holes to breakthrough the base plate and the inner portions of the through-holes are plated with metal. The area covering the through-holes is plated with metal layer. The area with no metal plated on the front is provided with a capacitance compensating gage with no electric connection to other parts. The base plate is provided with an earth connection surface covering the area with through-holes and extending. The feeding line consists of an internal heart yarn and a shielding layer. One end of the internal heart yarn is joined with the feeder point by electric connection. One end of the shielding layer is joined with the earth connection surface by electric connection.

Description

Planar double-frequency antenna

[technical field]

The relevant a kind of dual-band antenna of the utility model particularly relates to a kind of planar double-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 shown in the United States Patent (USP) No. 6002367, No. 6008762 and No. 6229485.

But when the flat plane antenna that above-mentioned patent disclosed was operated in double frequency, it was higher and cause the bigger shortcoming of volume to have a section; And 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 the shortcoming of debugging.

[summary of the invention]

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

For reaching above-mentioned purpose, the utility model provides a kind of planar double-frequency antenna, this planar double-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, 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 two radiating doublets corresponding first operating frequency of difference and second operating frequency, in the corresponding region of reverse side, there is not ground plane in two radiating doublets in the corresponding region of substrate reverse side.

Compared with prior art, the utility model planar double-frequency antenna adopts the printed circuit section lower thereby volume is 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.

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 illustrates the obverse and reverse view of printed circuit of a preferred embodiment of a kind of planar double-frequency antenna of the utility model.

Fig. 2 illustrates the structural representation of feeder line of a preferred embodiment of a kind of planar double-frequency antenna of the utility model.

Fig. 3 illustrates the voltage standing wave ratio test resolution of a preferred embodiment of a kind of planar double-frequency antenna of the utility model.

Fig. 4 is the electric field radiation resolution chart of a preferred embodiment of planar double-frequency antenna shown in Figure 1A, Figure 1B when working in the 2.45GHz frequency.

Fig. 5 is the magnetic field radiation resolution chart of a preferred embodiment of planar double-frequency antenna shown in Figure 1A, Figure 1B when working in the 2.45GHz frequency.

Fig. 6 is the electric field radiation resolution chart of a preferred embodiment of a kind of planar double-frequency antenna of the utility model when working in the 5.25GHz frequency.

Fig. 7 is the magnetic field radiation resolution chart of a preferred embodiment of a kind of planar double-frequency antenna of the utility model when working in the 5.25GHz frequency.

[embodiment]

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

See also its obverse and reverse view of Fig. 1 for the printed circuit of a preferred embodiment of a kind of planar double-frequency antenna of the utility model.

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

See also Fig. 2, Fig. 2 illustrates the structural representation of feeder line of a preferred embodiment of a kind of triangle antenna of the utility model.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 10 1 ends are electrically connected on the feedback point 5, and these screen 20 1 ends are electrically connected at the ground plane place of feedback point 5 correspondences.The other end of this screen 20 and the earth element on the electronic installation (not shown) electrically connect; And the other end of above-mentioned internal core wire 10 and the microwave receiving/transmitting element on the electronic installation (not shown) electrically connect.

Fig. 3 is voltage standing wave ratio (Voltage Standing Wave Ratio, the VSWR) test resolution of planar double-frequency antenna shown in Figure 1.By among this figure as can be seen, at frequency range 2.4GHz-2.5GHz and frequency range 5.15GHz-5.35GHz, the voltage standing wave ratio of present embodiment triangle antenna (VSWR) is less than 2, so satisfy IEEE802.11b, 802.11a (low frequency) consensus standard to antenna in the working frequency range scope, voltage standing wave ratio otherwise greater than 2.0 requirement.

See also Fig. 4, Fig. 5, Fig. 6, Fig. 7.

By Fig. 4, Fig. 5, Fig. 6, Fig. 7 as can be seen, the utility model planar double-frequency antenna has good directivity, does not have dead angle.

To sum up, the gain of the utility model triangle antenna can meet the requirement to antenna gain with 802.11b, 802.11a fully, and the utility model triangle antenna has the good operation bandwidth.The utility model planar double-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 planar double-frequency antenna, it is characterized in that, this planar double-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, planar double-frequency antenna as claimed in claim 1 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, planar double-frequency antenna as claimed in claim 1 is characterized in that, this capacitance compensation sheet does not electrically connect with other parts.

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

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

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

7, planar double-frequency antenna as claimed in claim 1 is characterized in that, 1/4 wavelength of this two radiating doublets corresponding first operating frequency of difference and second operating frequency.

As claim 1, the described planar double-frequency antenna of claim 7, it is characterized in that 8, this first operating frequency and second operating frequency are respectively 2.4G hertz (Hz) and 5.2G hertz (Hz).