CN2874804Y

CN2874804Y - Double frequency antenna

Info

Publication number: CN2874804Y
Application number: CN 200520058807
Authority: CN
Inventors: 伍国伟
Original assignee: Mitac Precision Technology Shunde Ltd
Current assignee: Mitac Precision Technology Shunde Ltd
Priority date: 2005-05-27
Filing date: 2005-05-27
Publication date: 2007-02-28
Anticipated expiration: 2015-05-27

Abstract

The utility model discloses an external dual-frequency antenna which comprises a primary vibrator, a secondary vibrator, and a third vibrator, connected horizontally in sequence. The primary vibrator is connected with shielding layers of a coaxial cable electrically while the secondary and the third vibrators are all spiral metal conductors and are coupled with inner core of the coaxial cable electrically. The primary vibrator can work together with the secondary vibrator in the frequency band of IEEE 802.11b. The primary vibrator can work with the third vibrator in the frequency band of IEEE 802.11a together. The operation principle is similar to that of half-wave symmetric vibrator antennas. The utility model of dual-frequency antenna can be used together with wireless communication electronic device in accordance with IEEE 802.11 a and b Wireless Communication Protocol. The advantages are generous gains and broad working frequency band.

Description

Dual-band antenna

Technical field

The utility model relates to a kind of antenna, particularly relates to a kind of and electronic installation and is used, and has that high-gain is big, a broadband and can satisfy IEEE 802.11a﹠amp; The external dual-band antenna of b.

Background technology

At present, the wireless LAN communication agreement mainly comprises IEEE 802.11b and two kinds of standards of 802.11a, they have become present mainstream standard, and 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 contained 5.15-5.85GHz.

Along with development of science and technology, it is more extensive that the use occasion of radio communication becomes, and the radio communication device that thereupon is developed use also increases greatly, and the agreement of radio communication also is developed, to satisfy the requirement of high-speed traffic.Simultaneously, in communicator, generally comprise an antenna that is used to communicate by letter, this antenna type is a lot, divide roughly two kinds according to the position of antenna and electronic installation relation: the one, be arranged at the external antenna of communicator shell, the one, be arranged at the built-in aerial of communicator inside.And the antenna of above-mentioned two types is the job requirements for the communication electronic equipment that satisfies different use occasions.Wherein, generally using built-in aerial mainly is to consider that the built-in aerial volume is little; Can be contained in electronic installation inside, be beneficial to the electronic installation use protection antenna of merely hitting, in order to avoid be damaged; Make electronic installation have portability etc. preferably simultaneously, such as the antenna that uses in the notebook host case.And external antenna generally is because antenna volume is not easy to be contained in electronic installation inside, and external antenna has directivity preferably, such as, the external antenna that uses on the radio network gateway, can adjust the direction of antenna at any time according to customer requirements, etc.

Nowadays, IEEE 802.11a﹠amp; The b wireless communication protocol is widely used in the electronic installation of radio communication, and industry has had the multiple 802.11a﹠amp that can satisfy; The external antenna of b wireless communication protocol, but some external antenna gain is less, and working band is narrower.

Summary of the invention

The utility model has disclosed a kind of external dual-band antenna, with use IEEE 802.11a﹠amp; Be used in the electronic installation of b wireless communication protocol, this external dual-band antenna has gain greatly, the advantage that working band is wide.

External dual-band antenna of the present utility model is to adopt following technical scheme to realize: a kind of dual-band antenna comprises: first, second and the 3rd oscillator, and it is a straight line respectively and connects setting according to this; One coaxial cable, the internal core wire and the screen that comprise mutual electrical isolation, wherein, this screen and above-mentioned first oscillator electrically connect, and internal core wire and the above-mentioned second and the 3rd oscillator couple, and the above-mentioned second and the 3rd oscillator is spiral metallic conductor, wherein, one terminal terminal connects corresponding with above-mentioned first oscillator of this second oscillator is provided with, and another terminal terminal connects corresponding with above-mentioned the 3rd oscillator of this second oscillator is provided with.

Preferable, above-mentioned the 3rd oscillator electrically connects away from the end of above-mentioned oscillator and is provided with one and is the frequency trim element of metallic conductor bar; Can be between above-mentioned first oscillator and the second oscillator respective ends but not electrically connect by a conductor rods is set, this conductor rods is connected with the internal core wire telecommunications of above-mentioned coaxial cable.

Owing to adopted as above technical scheme, external dual-band antenna of the present utility model can satisfy the requirement of the international standard of IEEE 802.11a and 802.11b to antenna: voltage standing wave ratio (VSWR) is not more than 2.0; Average gain is greater than-5.0dBi; When frequency of utilization was 2.4G-2.5G, peak gain was not more than 3.0dBi; When frequency of utilization was 5.15G-5.85G, peak gain was not more than 5.0dBi.Therefore, this external dual-band antenna has preferable use value.

Description of drawings

Fig. 1 is the schematic diagram of external dual-band antenna of the present utility model.

Fig. 2 is the size schematic diagram of external dual-band antenna of the present utility model.

Fig. 3 is the resolution chart of the voltage standing wave ratio of external dual-band antenna of the present utility model.

Fig. 4 A and Fig. 4 B are respectively the horizontal polarization of external dual-band antenna of the present utility model when working in the 2.45GHz frequency and the electromagnetic radiation test schematic diagram of perpendicular polarization.

Fig. 5 A and Fig. 5 B are respectively the horizontal polarization of external dual-band antenna of the present utility model when working in the 5.35GHz frequency and the electromagnetic radiation test schematic diagram of perpendicular polarization.

Embodiment

As shown in Figure 1, be the schematic diagram of external dual-band antenna of the present utility model.First oscillator 110 and second oscillator 120 and the 3rd oscillator 130 that this dual-band antenna 10 comprises in horizontal direction and is provided with according to this, wherein, above-mentioned first oscillator 110 is a metallic conductor, and above-mentioned second,

third oscillator

120 and 130 is spiral metallic conductor.In addition, this dual-band antenna 10 also comprises a coaxial cable 150, and this coaxial cable 150 comprises internal core wire 151 and screen 152; And be provided with an insulating barrier (not shown) between internal core wire 151 and the screen 152, make internal core wire 151 and screen 152 electrical isolation; And the outermost layer of screen 152 also is provided with an insulating barrier (not shown), makes the screen 152 and the external world be able to electrical isolation.

Above-mentioned first oscillator 110 electrically connects with the screen 152 of above-mentioned coaxial cable 150; Above-mentioned second,

third oscillator

120 and 130 all with internal core wire 151 electric property couplings of above-mentioned coaxial cable 150; Be connected with a conductor rods 141 between the relative end of one terminal and above-mentioned second oscillator 120 of above-mentioned first oscillator 110, and this conductor rods 141 electrically connects with the internal core wire 151 of above-mentioned coaxial cable 150, makes and realizes between above-mentioned second oscillator 120 and the above-mentioned internal core wire 151 that the signal of telecommunication passes mutually; Another end of above-mentioned second oscillator 120 is provided with a conductor rods 142 by connection and realizes electrically connecting with above-mentioned the 3rd oscillator 130.

And an end of above-mentioned the 3rd oscillator 130 is connected with a frequency trim element 160, and this frequency trim element 160 is a metallic conductor bar, and its length, diameter etc. all are the means that the operating frequency of this dual-band antenna 10 is finely tuned.

In addition, above-mentioned second,

third oscillator

120 and 130 is in the spiral helicon, form the straight number of turn of the conductor of this spiral, spiral through the pitch between, two adjacent spirals, spiral directly through etc., all be the key factor of above-mentioned second, third oscillator 120 of influence and 130 operating frequencies.Wherein, the conductor of composition spiral directly influences the working band of above-mentioned second,

third oscillator

120 and 130 through meeting; Pitch can influence operating frequency, specifically is that pitch is big more, and operating frequency is high more; Pound number and also can influence operating frequency; The diameter of spiral can influence operating frequency, specifically is that diameter is big more, and operating frequency is low more.

Above-mentioned first oscillator 110 and second oscillator 120 work in the frequency range of IEEE 802.11b; And above-mentioned first oscillator 110 works in the frequency range of IEEE 802.11a with above-mentioned the 3rd oscillator 130, and its operation principle is similar to the half-wave doublet antenna.

Wherein, the concrete parameter of a specific embodiment of the utility model antenna is seen Fig. 2, and the long measure among this figure is a millimeter.The length of above-mentioned first oscillator 110 is 25 millimeters; Spiral one end of above-mentioned second oscillator 120 and the distance of the other end are 10 millimeters, and pitch is 2 millimeters, and the diameter of spiral is 3 millimeters; The length of above-mentioned the 3rd oscillator 130 is 6 millimeters, and pitch is 1 millimeter, and the diameter of spiral is 2.2 millimeters; The length of said frequencies vernier element 160 is 10 millimeters.

Fig. 3 is voltage standing wave ratio (Voltage Standing WaveRatio, resolution chart VSWR) of dual-band antenna 10 of the present utility model.By the test result of this figure as can be seen, when this antenna 20 is operated in frequency range and is respectively 2.4-2.5GHz and 5.15-5.85GHz, the voltage standing wave ratio VSWR of this dual-band antenna 10 is not more than 2, as this resolution chart label is 1,2,3,4 indicate, wherein, label 1 expression, voltage standing wave ratio when frequency is 2.4GHz is 1.53, voltage standing wave ratio when label 2 expression frequencies are 2.5GHz is 1.37, voltage standing wave ratio when label 3 expression frequencies are 5.725GHz is 1.57, label 4 expressions, the voltage standing wave ratio when frequency is 5.85GHz is 1.41, so satisfy IEEE 802.11a﹠amp; The b consensus standard to antenna in the working frequency range scope, voltage standing wave ratio otherwise greater than 2.0 requirement.

Fig. 4 A and Fig. 4 B are respectively the horizontal polarization of external dual-band antenna of the present utility model when working in the 2.45GHz frequency and the electromagnetic radiation test schematic diagram of perpendicular polarization.Fig. 5 A and Fig. 5 B are respectively the horizontal polarization of external dual-band antenna of the present utility model when working in the 5.35GHz frequency and the electromagnetic radiation test schematic diagram of perpendicular polarization.Wherein, in the resolution chart, each lattice is expressed as 3dB.This test shows, dual-band antenna 10 of the present utility model can satisfy the omnibearing directivity requirement of antenna, and dual-band antenna of the present utility model 10 can satisfy the requirement of the international standard of IEEE 802.11a and 802.11b to antenna: voltage standing wave ratio (VSWR) is not more than 2.0; Average gain is greater than-5.0dBi; When frequency of utilization was 2.4G-2.5G, peak gain was not more than 3.0dBi; When frequency of utilization was 5.15G-5.85G, peak gain was not more than 5.0dBi.Therefore, this external dual-band antenna has preferable use value.

Claims

1. a dual-band antenna is characterized in that, comprising:

One first, second and the 3rd oscillator, it is a straight line respectively and connects setting according to this;

One coaxial cable comprises an internal core wire and a screen of mutual electrical isolation, and wherein, this screen and above-mentioned first oscillator electrically connect, and internal core wire and the above-mentioned second and the 3rd oscillator couple, and it is characterized in that:

The above-mentioned second and the 3rd oscillator is spiral metallic conductor, and wherein, terminal terminal connect corresponding with above-mentioned first oscillator of this second oscillator is provided with, and another terminal terminal connects corresponding with above-mentioned the 3rd oscillator of this second oscillator is provided with.

2. dual-band antenna as claimed in claim 1 is characterized in that, above-mentioned the 3rd oscillator electrically connects away from the end of above-mentioned oscillator and is provided with one and is the frequency trim element of metallic conductor bar.

3. dual-band antenna as claimed in claim 1 is characterized in that, can be between above-mentioned first oscillator and the second oscillator respective ends but not electrically connect by a conductor rods is set, and this conductor rods is connected with the internal core wire telecommunications of above-mentioned coaxial cable.