CN200956405Y

CN200956405Y - Three-frequency antenna

Info

Publication number: CN200956405Y
Application number: CN 200620071354
Authority: CN
Inventors: 李武
Original assignee: Mitac Precision Technology Kunshan Ltd
Current assignee: Mitac Precision Technology Kunshan Ltd
Priority date: 2006-05-12
Filing date: 2006-05-12
Publication date: 2007-10-03
Anticipated expiration: 2016-05-12

Abstract

The utility model discloses a triple-band antenna to solve the problem that an existing multi-band antenna has a complicated structure and poor receiving performance for high frequency signals. The triple-band antenna includes a grounding portion and three radiation portions located at one side of the grounding portion, wherein, a first radiation portion runs parallel to the grounding portion and the first radiation portion connected at one side to the grounding portion via a first coupling portion; a second and third radiation portions are arranged in a parallel manner at the side of the first radiation portion away from the grounding portion; the second and third portions are connected with the first radiation portion via a second coupling portion; the second radiation portion and the third radiation portion are arranged to have a same surface level and a narrow slot, thereby, the first, the second and the third radiation portions corresponds to a first, a second and a third working bands respectively and has a better signal receiving effect at different bands.

Description

Three-frequency antenna

[Ji Intraoperative field]

The utility model relates to a kind of three-frequency antenna, is meant a kind of plane reverse F type tri-frequency antennae that is applied to WLAN (wireless local area network) especially.

[Bei Jing Ji Intraoperative]

Along with the extensive use of WLAN (WLAN (wireless local area network)) at modern mobile office environment, the antenna that is installed on the portable communication apparatus is able to a large amount of uses, and common employed frequency range is 2.4-2.5GHz, 5.15-5.35GHz and 5.7-5.8GHz, for the frequency range between the 5.7-5.8GHz, the industry high frequency oscillators of existing dual-band antenna that adopt are contained more, the structure of this dual-band antenna can be joined shown in Figure 1, this antenna comprises antenna body 1 and feeder line (not drawing among the figure), wherein this antenna body 1 comprises first oscillator 10, second oscillator 11, substrate 13, and first connecting portion 14 that connects above-mentioned second oscillator 11 and substrate 13 be connected the above-mentioned the 1, second connecting portion 16 of second oscillator 11, above-mentioned second oscillator 11 extends from the lateral margin of substrate 13, and be connected with substrate 13 by first connecting portion 14, first oscillator 10 extends out from the lateral margin with respect to first connecting portion 14 of second oscillator 11, and be connected with second oscillator 11 by second connecting portion 16, and first oscillator 10, second oscillator 11 and substrate 13 the threes plane at place respectively form the stereochemical structure that is parallel to each other in twos, and Fig. 2 for this reason antenna measure figure in the voltage standing wave ratio performance of its working frequency range, it is at a certain specific size of this antenna, for this size, those skilled in the art can be easy to debug according to practical application, so do not mark, as can be seen from Figure 2, its frequency range between 5.7-5.8GHz, its standing-wave ratio is greater than 2, thereby undesirable.Certainly, industry also has the microstrip antenna of use to realize three frequently, but needs many continuous little bands different in size, different of deposition on circuit board, and processing procedure is comparatively complicated.

Therefore, be necessary to provide a kind of three-frequency antenna in fact, it has preferable signal emission and reception when high band, and is easy to make.

[summary of the invention]

Therefore, the purpose of this utility model is to provide a kind of three-frequency antenna, and it has preferable signal emission and reception when high band, and is easy to make.

For reaching above-mentioned purpose, the utility model three-frequency antenna comprises a grounding parts and first and second Department of Radiation that is positioned at grounding parts one side, wherein first Department of Radiation parallels with grounding parts, and the one side is connected with grounding parts by first connecting portion, and second Department of Radiation is located at the side of first Department of Radiation away from grounding parts, and be arranged in parallel with first Department of Radiation, and second Department of Radiation is connected with first Department of Radiation by second connecting portion, and this antenna also comprises a feeder line, this feeder line is a coaxial cable, comprise internal core wire and screen, its screen is connected with grounding parts, and wherein this antenna also is provided with the 3rd Department of Radiation, and the 3rd Department of Radiation and the setting of the second Department of Radiation coplane, and be provided with a slit therebetween, the internal core wire of this feeder line is welded on one of the second or the 3rd Department of Radiation.

According to above-mentioned principal character, this second connecting portion and the first pontes are located at the first Department of Radiation both sides and are all extended to the direction that deviates from first Department of Radiation.

According to above-mentioned principal character, the length of this grounding parts is the longest, and first Department of Radiation takes second place, second Department of Radiation takes second place again, and the 3rd Department of Radiation is the shortest.

According to above-mentioned principal character, this first Department of Radiation, second Department of Radiation and the 3rd Department of Radiation be corresponding 2.4-2.5GHz respectively, 5.15-5.35GHz and the frequency range of 5.7-5.8GHz, and the length of first Department of Radiation, second Department of Radiation and the 3rd Department of Radiation corresponds respectively to the wavelength ratio of a characteristic frequency in the above-mentioned frequency range.

According to above-mentioned principal character, side two ends of this grounding parts are respectively equipped with fixed head, and are provided with an installing hole in the middle part of this fixed head, and this fixed head and first connecting portion are located at the same side of grounding parts, and are parallel to each other.

Compared with prior art, the utility model is by being provided with first, second and the 3rd Department of Radiation, thereby it is corresponding with three working frequency range, can guarantee that so this kind antenna has preferable signal emission and reception when high band, and this antenna only needs simple punching press to finish, so be easy to make.

For the purpose of this utility model, structural feature and function thereof are had further understanding, conjunction with figs. is described in detail as follows now:

[description of drawings]

Fig. 1 illustrates the schematic perspective view of existing dual-band antenna.

Fig. 2 illustrates dual-band antenna shown in Figure 1 voltage standing wave ratio performance measurement figure at its working frequency range.

Fig. 3 illustrates the schematic perspective view of the utility model three-frequency antenna.

[embodiment]

See also shown in Figure 3, the utility model tri-band antenna 2 comprises a grounding parts 20 and first Department of Radiation 21 that is positioned at grounding parts 20 1 sides, second Department of Radiation 22 and the 3rd Department of Radiation 23, wherein first Department of Radiation 21 parallels with grounding parts 20, and the one side is connected with grounding parts 20 by first connecting portion 26, form one between first Department of Radiation 21 like this and the grounding parts 20 at interval, thereby form first resonant cavity, and second Department of Radiation 22 and the 3rd Department of Radiation 23 are located at the side of first Department of Radiation 21 away from grounding parts 20, and be arranged in parallel with first Department of Radiation 21, and second Department of Radiation 22 is connected with first Department of Radiation 21 by second connecting portion 25 with the 3rd Department of Radiation 23, wherein this second connecting portion 25 is located at first Department of Radiation, 21 both sides with the first pontes and is all extended to the direction that deviates from first Department of Radiation 21, and this second Department of Radiation 22 and the 23 coplane settings of the 3rd Department of Radiation, and be provided with a slit 29 therebetween, so this first Department of Radiation 21 forms a virtual ground plane, thereby make second Department of Radiation 22 and the 3rd Department of Radiation 23 form second resonant cavity and the 3rd resonant cavity respectively and between first Department of Radiation 21, simultaneously in the present embodiment, grounding parts 20 is the longest, first Department of Radiation 21 takes second place, second Department of Radiation 22 takes second place again, the 3rd Department of Radiation 23 is the shortest, first Department of Radiation 21 like this, second Department of Radiation 22 and the 3rd Department of Radiation 23 be corresponding 2.4-2.5GHz respectively, 5.15-5.35GHz and the frequency range of 5.7-5.8GHz, and first Department of Radiation 21, the length of second Department of Radiation 22 and the 3rd Department of Radiation 23 corresponds respectively to the wavelength ratio of a characteristic frequency in the above-mentioned frequency range.Thereby guarantee that this antenna is in the preferable performance of the signal tool of each frequency range.

In addition, antenna 2 of the present utility model also comprises a feeder line 3, and this feeder line 3 is generally coaxial cable, comprises internal core wire 30 and screen 31.And between this internal core wire 30 and the screen 31, and between this screen 31 and the external world around it, include an insulating medium layer 32, one end of this screen 31 is electrically connected on the grounding parts 20, and the earth element (not shown) of the electronic installation of the other end of this screen 31 and this antenna 2 of use electrically connects; One end of above-mentioned internal core wire 30 is electrically connected on one of above-mentioned second Department of Radiation 22 and the 3rd Department of Radiation 23, and microwave receiving/transmitting element of the electronic installation of the other end of above-mentioned internal core wire 30 and this antenna 2 of use electrically connects.

In addition, this antenna 2 is mounted on the electronic installation that uses this antenna 2 for convenient, one side two ends of this grounding parts 20 are respectively equipped with fixed head 27, and these fixed head 27 middle parts are provided with an installing hole 28, so can pass this installing hole 28 and this antenna 2 is fixed on the electronic installation by a screw (not shown), in the present embodiment, this fixed head 27 and first connecting portion 26 are located at the same side of grounding parts 20, and are parallel to each other.

Compared with prior art, the utility model is by arranging first, second and the 3rd Department of Radiation, thereby Corresponding with three working frequency range, can guarantee that so this kind antenna has better signal emission when high band With reception, and this antenna only needs simple punching press to finish, so be easy to make.

Claims

1, a kind of three-frequency antenna, comprise a grounding parts and first and second Department of Radiation that is positioned at grounding parts one side, wherein first Department of Radiation parallels with grounding parts, and the one side is connected with grounding parts by first connecting portion, and second Department of Radiation is located at the side of first Department of Radiation away from grounding parts, and be arranged in parallel with first Department of Radiation, and second Department of Radiation is connected with first Department of Radiation by second connecting portion, and this antenna also comprises a feeder line, this feeder line is a coaxial cable, comprise internal core wire and screen, its screen is connected with grounding parts, it is characterized in that: this antenna also is provided with the 3rd Department of Radiation, and the 3rd Department of Radiation and the setting of the second Department of Radiation coplane, and be provided with a slit therebetween, the internal core wire of this feeder line is welded on one of the second or the 3rd Department of Radiation.

2, three-frequency antenna as claimed in claim 1 is characterized in that: this second connecting portion and the first pontes are located at the first Department of Radiation both sides and are all extended to the direction that deviates from first Department of Radiation.

3, three-frequency antenna as claimed in claim 1 is characterized in that: the length of this grounding parts is the longest, and first Department of Radiation takes second place, second Department of Radiation takes second place again, and the 3rd Department of Radiation is the shortest.

4, as claim 1 or 2 or 3 described three-frequency antennas, it is characterized in that: this first Department of Radiation, second Department of Radiation and the 3rd Department of Radiation be corresponding 2.4-2.5GHz respectively, 5.15-5.35GHz and the frequency range of 5.7-5.8GHz, and the length of first Department of Radiation, second Department of Radiation and the 3rd Department of Radiation corresponds respectively to the wavelength ratio of a characteristic frequency in the above-mentioned frequency range.

5, three-frequency antenna as claimed in claim 4 is characterized in that: side two ends of this grounding parts are respectively equipped with fixed head, and are provided with an installing hole in the middle part of this fixed head, and this fixed head and first connecting portion are located at the same side of grounding parts, and are parallel to each other.