CN2600926Y

CN2600926Y - Double-frequency antenna

Info

Publication number: CN2600926Y
Application number: CNU022868003U
Authority: CN
Inventors: 戴新国; 戴隆盛; 林宪助; 郭家铭
Original assignee: Hongteng Precision Technology Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Hongteng Precision Technology Co Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2002-11-08
Filing date: 2002-11-08
Publication date: 2004-01-21
Anticipated expiration: 2012-11-08

Abstract

A dual-frequency antenna that is positioned in electronic devices for reception and transmission of RF signals, which comprises a planar insulated substrate, a feeder line, as well as a grounding part, a primary radiation part and secondary radiation part that are mounted on the planar insulated substrate, a primary connecting part that connects the primary radiation part and the grounding part, and a secondary connecting part that connects the primary radiation part and the secondary radiation part, wherein the grounding part is extended to form an extension part; a feed-in part is positioned at the joining part of the secondary radiation part and the secondary connecting part. The primary radiation part, the secondary connecting part, the feed-in part, the grounding part, the extension part of the grounding part and the feeder line form a planar inverse F-shaped antenna for low frequency bands; the feed-in part, the secondary radiation part, the primary connecting part, the grounding part, the extension part of the grounding part and the feeder line form a conductive loop to constitute a circular antenna for high frequency bands. Through combination of the circular antenna and the inverse F-shaped antenna, the dual-frequency antenna can work both at high and low frequency bands, and can realize width band characters at high working frequency bands.

Description

Dual-band antenna

[technical field]

The utility model relates to a kind of antenna, relates in particular to a kind of being installed in and is used for the dual-band antenna that receives or transmit in the electronic installation.

[background technology]

At present, the WLAN communication agreement mainly comprises IEEE 802.11a and two kinds of standards of 802.11b, wherein the working frequency range of 802.11b is mainly 2.4-2.5GHz, and the working frequency range of 802.11a is contained 5.15-5.825GHz, mainly comprise 5.15-5.25GHz, 5.25-5.35GHz, three frequency ranges of 5.725-5.825GHz.

In order to make the communication apparatus can compatible 802.11a and two kinds of standards of 802.11b, need to use double frequency or multifrequency antenna, (Planar Inverted-F Antenna PIFA) is exactly mobile device in modern age a kind of desirable miniaturization built-in aerial commonly used to planar inverted F-shape antenna.But because the electric gonosome of antenna amasss/(frequency band * gain * efficient)=constant, with antenna planeization and miniaturization, its frequency bandwidth and radiation efficiency all can reduce, therefore, the dual-band antenna that planar inverted F-shape antenna constitutes, its working band often can't be contained three frequency ranges of 802.11a simultaneously.

A kind of way that addresses the above problem is the mode that adopts two or more antenna to combine, and can consult United States Patent (USP) the 6th, 204, the dual-band antenna shown in 819 B1 numbers.The dual-band antenna of this prior art comprises planar inverted F-shape antenna and loop aerial structure simultaneously, selects different signal feed-in modes to switch between the two by switch.Owing to adopt different antenna structures, the adjustable scope of this dual-band antenna working band is big and relatively flexibly, for example, can changing wherein, the relevant parameter of loop aerial makes it have wide band characteristic.Yet this dual-band antenna adopts stereochemical structure, need take bigger space, is unfavorable for that electronic product develops to miniaturization.In addition, this dual-band antenna adopts different signal feed-in modes to come the switch operating frequency band, complex structure, and cost is higher.

[utility model content]

The purpose of this utility model is to provide that a kind of cost is lower, volume is less and have the dual-band antenna of broadband character.

For achieving the above object, the utility model dual-band antenna comprise plane insulated substrate, feeder line and paste grounding parts on the insulated substrate of plane, first Department of Radiation, second Department of Radiation, connect first Department of Radiation and grounding parts first connecting portion, be connected second connecting portion of first Department of Radiation and second Department of Radiation, wherein extension is provided with extension on the grounding parts, and the junction of second Department of Radiation and second connecting portion is provided with feeding portion.The extension of first Department of Radiation, second connecting portion, feeding portion, grounding parts, grounding parts and feeder line constitute planar inverted F-shape antenna, work in lower band; Form the loop of conducting between the extension of feeding portion, second Department of Radiation, first connecting portion, grounding parts, grounding parts and feeder line, thereby the looping antenna works in high frequency band.

Compared to prior art, the utility model dual-band antenna adopts planar structure, and volume is less, cost is lower, and by combining of loop aerial and planar inverted F-shape antenna, both can be operated in higher and lower frequency band, can realize wide band characteristic at higher working band again.

The purpose of this utility model, feature and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.

[description of drawings]

Fig. 1 is the front view of first embodiment of the present utility model.

Fig. 2 works in the electromagnetic radiation field pattern of the horizontal polarization of 2.484GHz frequency for the utility model.

Fig. 3 works in the electromagnetic radiation field pattern of the perpendicular polarization of 2.484GHz frequency for the utility model.

Fig. 4 works in the electromagnetic radiation field pattern of the horizontal polarization of 5.35GHz frequency for the utility model.

Fig. 5 works in the electromagnetic radiation field pattern of the perpendicular polarization of 5.35GHz frequency for the utility model.

Fig. 6 works in the electromagnetic radiation field pattern of the horizontal polarization of 5.725GHz frequency for the utility model.

Fig. 7 works in the electromagnetic radiation field pattern of the perpendicular polarization of 5.725GHz frequency for the utility model.

Fig. 8 is voltage standing wave ratio of the present utility model (Voltage Standing Wave Ratio, a VSWR) test resolution.

Fig. 9 is the front view of second embodiment of the present utility model.

[embodiment]

Please refer to shown in Figure 1ly, the first embodiment dual-band antenna 1 of the present utility model comprises plane insulated substrate 30, grounding parts 10, first Department of Radiation 21, second Department of Radiation 22, first connecting portion 23, second connecting portion 25 and signal feed 40.

Grounding parts 10, first Department of Radiation 21, second Department of Radiation 22, first connecting portion 23 and second connecting portion 25 are sheet metal and are covered on the surface of insulated substrate 30 the same sides, wherein grounding parts 10, first Department of Radiation 21 and first connecting portion 23 all are the lengthwise strip, first connecting portion 23 is connected the end of first Department of Radiation 21 with the end of grounding parts 10, the other end of first Department of Radiation 21 is to be parallel to the free end that grounding parts 10 extends.Second Department of Radiation 22 and second connecting portion 25 are all stepped, and second connecting portion 25 is connected an end of second Department of Radiation 22 and the middle part of first Department of Radiation 21, and the other end of second Department of Radiation 22 then is connected with the middle part of first connecting portion 23.In addition, grounding parts 10 levels are provided with extension 11, and second connecting portion 25 and the junction horizontal-extending of second Department of Radiation 22 are provided with the feeding portion 24 relative with extension 11.

Feeder line 40 is a coaxial line, comprises wire sheathing 41 and inner core lead 42, and wherein inner core lead 42 is welded on the feeding portion 24, and wire sheathing 41 is welded on the extension 11 of grounding parts 10.

40 of the extension 11 of first Department of Radiation 21, second connecting portion 25, feeding portion 24, grounding parts 10, grounding parts 10 and feeder lines constitute a planar inverted F-shape antenna, are used for receiving or launch signal than low frequency; The extension 11 of inner core lead 42, feeding portion 24, second Department of Radiation 22, first connecting portion 23, grounding parts 10, grounding parts 10 and wire sheathing 41 constitute the loop of conducting, thereby form a loop aerial, are used for launching or receiving the signal of higher-frequency.

Fig. 2 is respectively that the utility model dual-band antenna 1 is being packed an electronic installation (as notebook computer) into afterwards to Fig. 7, level when the operating frequency that records is respectively 2.484GHz, 5.35GHz and 5.725GHz and perpendicular polarization electromagnetic radiation field pattern, by test result as can be known, the average gain of dual-band antenna 1 all can meet the demands under three kinds of operating frequencies, does not have tangible dead angle.

Please refer to shown in Figure 8, the utility model dual-band antenna 1 is after the described electronic installation of packing into, the value of the voltage standing wave ratio that records operating frequency be between 2.35-2.80GHz and the 5.09-7.00GHz all less than 2, show that promptly the working band of the utility model dual-band antenna 1 is contained IEEE 802.11a and substandard all frequency ranges of 802.11b fully.

In addition, please refer to shown in Figure 1ly, by adjusting the length of L, M, N respectively, can regulate the frequency resonance point of dual-band antenna 1 to a certain extent, for example, increase L, the low-frequency resonance of dual-band antenna 1 is named a person for a particular job and is moved to low frequency more; Reduce M, then low-frequency resonance point moves to low frequency more, and high-frequency resonance point moves to high frequency more; Reduce N, the high-frequency resonance point of dual-band antenna 1 and low-frequency resonance point all move to high frequency more.

Please refer to shown in Figure 9ly, first Department of Radiation 61 and second Department of Radiation 62 of another embodiment dual-band antenna 2 of the present utility model are all L-shaped, and an end of second Department of Radiation 62 is connected with first Department of Radiation 61, and the other end is connected with second connecting portion 65.Because other member of present embodiment dual-band antenna 2 is all basic identical with first embodiment, this place repeats no more.

Claims

1. dual-band antenna, comprise grounding parts, first Department of Radiation, second Department of Radiation, connect first Department of Radiation and grounding parts first connecting portion, is connected second connecting portion and the feeder line of first Department of Radiation and second Department of Radiation, wherein grounding parts, first Department of Radiation, second connecting portion and feeder line formation planar inverted F-shape antenna; Form the loop of conducting between second Department of Radiation, first connecting portion, grounding parts and feeder line, thereby the looping antenna is characterized in that: extension is provided with extension on the grounding parts, and the junction of second Department of Radiation and second connecting portion is provided with feeding portion.

2. dual-band antenna as claimed in claim 1 is characterized in that: described feeder line is a coaxial line, comprises wire sheathing and inner core lead.

3. dual-band antenna as claimed in claim 2 is characterized in that: described inner core lead and feeding portion electrically connect, and the extension of wire sheathing and grounding parts electrically connects.

4. dual-band antenna as claimed in claim 3 is characterized in that: described first Department of Radiation is the lengthwise strip, and second connecting portion and second Department of Radiation are all stepped.

5. dual-band antenna as claimed in claim 4 is characterized in that: described second Department of Radiation is connected with first connecting portion.

6. dual-band antenna as claimed in claim 3 is characterized in that: described first Department of Radiation and second Department of Radiation are all L-shaped.

7. dual-band antenna as claimed in claim 6 is characterized in that: described second Department of Radiation is connected with first Department of Radiation.

8. dual-band antenna as claimed in claim 1, it is characterized in that: described dual-band antenna also comprises the plane insulated substrate, and described grounding parts, first Department of Radiation, second Department of Radiation, first connecting portion and second connecting portion, extension and feeding portion all paste on the surface of insulated substrate the same side, described plane.