CN1549395A

CN1549395A - Three-frequency dipole antenna and producing method thereof

Info

Publication number: CN1549395A
Application number: CNA031308597A
Authority: CN
Inventors: 洪振达; 戴隆盛; 郭家铭
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: 2003-05-15
Filing date: 2003-05-15
Publication date: 2004-11-24

Abstract

The present invention relates to a three-frequency doublet antenna and its making method. Said three-frequency doublet antenna includes insulating base plate, doublet antenna and feeder line, the doublet antenna includes symmetrically arranged radiation portion and grounding portion, in which the radiation portion and grounding portion are equipped with L-shaped open groove respectively. Said correspondent making method includes the following steps: providing an insulating base plate, symmetrically placing two identical metal thin sheets on the surface of the insulating base plate, respectively cutting L-shaped open groove on every metal thin sheet, dividing every metal sheet into two portions which have a common end and are different in area, providing a coaxial feeder line and making its metal braided layer and inner core conducting wire respectively be electrically connected with two metal thin sheets.

Description

Three frequency dipole antenna and manufacture methods thereof

[technical field]

The present invention relates to a kind of antenna and manufacture method thereof, relate in particular to a kind of three dipole antenna and manufacture methods thereof frequently that are used in the electronic installation receiving or transmit that are installed in.

[background technology]

At present, wireless lan (wlan) is as one of wireless communication technique with fastest developing speed, main IEEE802.11g, IEEE802.11b/a and the Bluetooth four big standards of adopting, wherein the standard of IEEE802.11g, IEEE802.11b and Bluetooth is applicable to the frequency range of 2.4GHz, and another kind of standard IEEE 802.11a then is applicable to the frequency range of 5GHz.

In development in the past, use the more standard that is based on 2.4GHz, present further developing along with wireless network, IEEE802.11a also can provide the transmission speed that exceeds any other wlan solution for whole coverage area because of it, service band is difficult for being interfered or signal is not seized plurality of advantages and key chip appearance such as channel, make IEEE802.11a production cost reduce, its market prospects are wide.

Yet, no matter adopt any communication standard, always the indispensable assembly of antenna wireless device.Wherein, microstrip antenna because of its have gently, thin, little and can obtain single bearing circle, greatest irradiation is substantially in the normal direction on plane, and is easy to realize the characteristics of linear polarization or circular polarization and two-frequency operation, and is widely used in portable electron device.

But, the antenna system that existing microstrip antenna approaches to seal, frequency range is narrow, and efficient is low, if the client needs wider frequency in 5GHz～6GHz frequency range, or needs the various criterion under the while employing wireless local area network (LAN), and then present microstrip antenna is difficult to reach demand.

Relevant prior art can be consulted United States Patent (USP) the 5th, 892, No. 486, the dipole antenna that it disclosed is a planar structure, comprise horizontally disposed dipole terminal and feeder line connected vertically, the junction of described feeder line and dipole terminal is provided with the end, and this end dimpling is in dipole terminal place straight line.Adopt this kind structure can make the frequency range of the frequency range of dipole antenna, but it can not work in double frequency and can not realize broadband properties at higher working band greater than the prior art structure of same size.

[summary of the invention]

The object of the present invention is to provide a kind of three frequency dipole antenna and manufacture methods thereof with broadband properties.

For achieving the above object, the present invention adopts following technical scheme: the present invention three is dipole antenna frequently, comprise insulated substrate, dipole antenna and feeder line, dipole antenna comprises Department of Radiation and the grounding parts that is symmetricly set on the insulated substrate, this Department of Radiation and grounding parts all are provided with L type fluting, and described feeder line is a coaxial cable, and it comprises inner core lead and the outside braid that is connected with Department of Radiation and grounding parts respectively.

The present invention three manufacture method of dipole antenna frequently mainly may further comprise the steps:

One insulated substrate is provided;

Be symmetrical arranged two identical sheet metals on the insulated substrate surface;

On two sheet metals, offer L shaped fluting respectively, each sheet metal is divided into has a common port but two different parts of area; And

One coaxial feeder is provided, its wire sheathing and inner core lead are electrically connected with two sheet metals respectively.

Compared with prior art, the present invention's three frequency dipole antennas form Department of Radiation and grounding parts corresponding to different frequency bands, and can realize wide band characteristic at higher working band by the L type fluting in Department of Radiation and grounding parts setting.

[description of drawings]

Fig. 1 is the present invention three plane structure chart of dipole antenna frequently.

Fig. 2 is the present invention three size indication figure of dipole antenna frequently.

Fig. 3 is the present invention three standing-wave ratio resolution chart of dipole antenna frequently.

Fig. 4 is the horizontal polarization electromagnetic radiation diagram that the present invention's three frequency dipole antennas are operated in 2.45GHz.

Fig. 5 is the perpendicular polarization electromagnetic radiation diagram that the present invention's three frequency dipole antennas are operated in 2.45GHz.

Fig. 6 is the horizontal polarization electromagnetic radiation diagram that the present invention's three frequency dipole antennas are operated in 5.35GHz.

Fig. 7 is the perpendicular polarization electromagnetic radiation diagram that the present invention's three frequency dipole antennas are operated in 5.35GHz.

Fig. 8 is the horizontal polarization electromagnetic radiation diagram that the present invention's three frequency dipole antennas are operated in 5.725GHz.

Fig. 9 is the perpendicular polarization electromagnetic radiation diagram that the present invention's three frequency dipole antennas are operated in 5.725GHz.

[embodiment]

Please refer to shown in Figure 1ly, the present invention three dipole antennas 1 frequently comprises dipole antenna 20, insulated substrate 30 and feeder line 40.

Dipole antenna 20 is sheet metal and is covered on insulated substrate 30 1 side surfaces that it roughly is the lengthwise bar shaped and comprises first Department of Radiation 24, second Department of Radiation 22, first grounding parts 23 and second grounding parts 21.Described first Department of Radiation 24, second Department of Radiation 22 and first grounding parts 23, second grounding parts 21 are symmetricly set on the insulated substrate 30.Wherein second Department of Radiation 22 is operated in than low-frequency range, and it is that the elongate structure and an end broad other end are narrower, and a narrower end is arranged on the middle part of insulated substrate 30.First Department of Radiation 24 is operated in higher frequency band, it is elongate structure and the downside of being located at second Department of Radiation, 22 narrower ends, the one end links to each other with second Department of Radiation 22, the other end is provided with and ends near second Department of Radiation, 22 broads, one end place to the extension of the end of insulated substrate 30, thereby has formed L type fluting 26 between first Department of Radiation 24 and second Department of Radiation 22.Second grounding parts 21 is operated in than low-frequency range, it is that the elongate structure and an end broad other end are narrower, a narrower end is arranged on the middle part of insulated substrate 30, and first grounding parts 23 is operated in higher frequency band, it is even elongate structure and the downside of being located at second grounding parts, 21 narrower ends, the one end links to each other with second grounding parts 21, the other end is to the end of insulated substrate 30 and end near second grounding parts, 21 broads, one end place, thereby has formed L type fluting 25 between first grounding parts 23 and second grounding parts 21.

Feeder line 40 is a coaxial line, comprises wire sheathing 42 and inner core lead 41, and wherein inner core lead 41 is welded on the junction of first Department of Radiation 24 and second Department of Radiation 22, and wire sheathing 42 is welded on the junction of first grounding parts 23 and second grounding parts 21.

Please refer to shown in Figure 2ly, by adjusting the length of SL, SH, GL and GH respectively, can adjust three working bands of dipole antennas 1 frequently, marked out the present invention three portion size parameter of dipole antennas 1 frequently among the figure, the unit of numerical value is millimeter (mm) among the figure.

Please refer to shown in Figure 3, the present invention three frequently dipole antennas 1 voltage standing wave ratio value operating frequency be between 2.4GHz～2.5GHz and the 5.15GHz～5.725GHz all less than 2, promptly show the present invention three frequently the working band of dipole antennas 1 contain IEEE802.11a and substandard all frequency ranges of 802.11b fully.

Fig. 4 is respectively that the present invention's three frequency dipole antennas 1 are being packed an electronic installation (as notebook computer) into afterwards to Fig. 9, level when the operating frequency that records is respectively 2.45GHz, 5.35GHz and 5.725GHz and perpendicular polarization electromagnetic radiation field pattern, by test result as can be known, under three kinds of operating frequencies three frequently the average gain of dipole antennas 1 all can meet the demands, do not have tangible dead angle.

Claims

1. dipole antenna frequently, comprise insulated substrate, dipole antenna and feeder line, wherein dipole antenna comprises Department of Radiation and the grounding parts that is symmetricly set on the insulated substrate, described feeder line is a coaxial cable, comprise respectively the inner core lead and the outside braid that electrically connect with Department of Radiation and grounding parts, it is characterized in that: described Department of Radiation and grounding parts all are provided with L type fluting.

2. three frequency dipole antennas as claimed in claim 1, it is characterized in that: the Department of Radiation of described dipole antenna comprises first Department of Radiation and second Department of Radiation with common port, corresponding higher and lower respectively working frequency range, described L type fluting is arranged between first Department of Radiation and second Department of Radiation.

3. three frequency dipole antennas as claimed in claim 2, it is characterized in that: the Department of Radiation of described dipole antenna comprises first grounding parts and second grounding parts with common port, corresponding higher and lower respectively working frequency range, described L type fluting is arranged between first grounding parts and second grounding parts.

4. three frequency dipole antennas as claimed in claim 3, it is characterized in that: the inner core lead of described coaxial cable is connected with the common port of first and second Departments of Radiation and the common port of first and second grounding parts respectively with wire sheathing.

5. manufacture method of dipole antenna frequently may further comprise the steps:

One insulated substrate is provided;

6. the manufacture method of three frequency dipole antennas as claimed in claim 5, it is characterized in that: described wire sheathing is connected with described common port respectively with the inner core lead.

7. the manufacture method of three frequency dipole antennas as claimed in claim 6, it is characterized in that: the less part of the described foil area that links to each other with wire sheathing forms first grounding parts, be operated in higher frequency band, the part that area is bigger forms second grounding parts, is operated in than low-frequency range.

8. the manufacture method of three frequency dipole antennas as claimed in claim 7, it is characterized in that: the less part of the described foil area that links to each other with the inner core lead forms first Department of Radiation, be operated in higher frequency band, the part that area is bigger forms second Department of Radiation, is operated in than low-frequency range.