CN201430212Y - Doublet antenna - Google Patents

Abstract

The utility model discloses a doublet antenna, which comprises a medium base plate, two doublet arms and a feed joint. The two oval doublet arms are adhered to the surface of the medium base plate onthe same side and are connected through the feed joint; the long shafts and the short shafts of the two oval identical doublet arms are 80mm and 60mm respectively; the medium base plate made of epoxyresin is a circle with the diameter of 136mm and the thickness of 1.6mm; and the feed joint is an SMA joint. The oval doublet antenna provided by the utility model has the property of ultra wide band,and the working band thereof covers all the frequency range of the current mobile communication field; and in addition the oval doublet antenna with small volume, light weight, convenient carrying and easy processing and manufacturing can be widely applied in wireless mobile communication systems and is particularly suitable for small and portable mobile communication systems.

Description

A kind of dipole antenna

Technical field

The utility model relates to wireless communication field, is specifically related to a kind of dipole antenna.

Background technology

In recent years, the ultra broadband short-distance wireless communication has caused that the global communication technical field payes attention to greatly.Ultra-wideband Communication Technology is strong with its transmission rate height, anti-multipath interference performance, the confidentiality advantages of higher becomes short-distance wireless communication and has one of technology of competitiveness and development prospect.In ultra-wideband communication system, ultra-wideband antenna is one of critical component.The ultra-wideband antenna structure that some are commonly used, as traveling-wave antenna, logarithm periodic antenna, equiangular spiral antenna, horn antenna etc., these antenna can be realized the working band of several octaves, but they all have a common shortcoming, be that physical dimension is big, and mostly be stereochemical structure, can not satisfy the demand of needs miniaturization in the portable mobile radio system, complanation antenna.

Dipole antenna is a most basic present antenna form, has the omnidirectional radiation characteristic, and it is simple in structure, cheap, is widely used in the various wireless communication systems.But the frequency band of common dipole antenna very narrow (being about 1%-5%), dipole antenna that some is novel such as biconical antenna, double dipole antenna etc., bandwidth is that tangible broadening is arranged, but its working band is many more than 3GHz, be not suitable for mobile communication frequency range at present commonly used (800MHz～3GHz), and the structure relative complex mostly is stereochemical structure, still is not suitable for portable mobile radio system.

The utility model content

For fear of the problems referred to above, the ultra broadband dipole antenna that the utility model provides a kind of working band can cover at present all mobile communication frequency ranges, and simple in structure, function admirable.

The technical scheme that its technical problem that solves the utility model adopts is:

A kind of dipole antenna comprises medium chassis, two dipole arm and feed connection, and described two dipole arm are oval;

And described two dipole arm are attached at the same side surface on medium chassis, also continuous by described feed connection.

Preferably, two oval dipole arm sizes are consistent.

Preferably, the major axis of two oval dipole arm is 80mm, and minor axis is 60mm.

Preferably, described medium chassis is circular.

Preferably, the diameter on circular medium chassis is 136mm, and thickness is 1.6mm.

Preferably, described medium chassis is made by epoxy resin.

Preferably, described feed connection is a sub-miniature A connector.

Oval dipole antenna relative bandwidth of the present utility model is big, have ultra wideband, and its working band covers all band limits of present moving communicating field, the mobile band scope of the 800MHz～3GHz that is particularly useful for using always.In addition, oval dipole antenna of the present utility model is a flat plane antenna, and its diameter has only 136mm, the manufactured materials that uses is comparatively common, has the advantage that volume is little, in light weight, be convenient for carrying, be convenient to processing and manufacturing, therefore can be widely used in being particularly useful in the mobile communication system of small portable in the mobile radio system.

Description of drawings

Fig. 1 is the structural representation of dipole antenna of the present utility model.

Fig. 2 is the structural representation of the feed connection of dipole antenna of the present utility model.

Fig. 3 is oval dipole antenna S11 of the present utility model emulation and test data figure.

Fig. 4 is oval dipole antenna voltage standing wave ratio emulated data figure of the present utility model.

Embodiment

The purpose of this utility model is to provide a kind of working band can cover at present all mobile communication frequency ranges, super wide band plane dipole antenna simple in structure.

For making the purpose of this utility model, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the utility model is further described.

Fig. 1 is the structural representation of dipole antenna of the present utility model.As shown in Figure 1, dipole antenna of the present utility model is a planar structure, comprise medium chassis 2, two dipole arm 1A, 1B and feed connection 3, wherein, two dipole arm 1A, 1B shape unanimity, be ellipse, and all be attached at the same surface on medium chassis 2, feed connection 3 is connected with two dipole arm 1A, 1B.

Medium chassis 2 is used to support two dipole arm 1A, 1B and feed connection 3, and it can manufacture diameter is that 136mm, thickness are the circle of 1.6mm, and it is made by epoxy resin, and dielectric constant is 4.4.This material is used for making single face circuit board and flat plane antenna more, and is more common and cheap.

In order to make dipole antenna of the present utility model can be applicable to the mobile communication frequency range of 800MHz～3GHz commonly used at present, therefore its resonance band is designed to 800MHz～6.0GHz, that is, and f ₁=0.8GHz, f ₂=6.0GHz.When the length of antenna be the radio signal wavelength 1/2 the time, antenna to transmit and receive conversion efficiency the highest, wherein, the length of antenna is the length sum of two oval arms, then when the length of oval arm be the radio signal wavelength 1/4 the time, antenna to transmit and receive conversion efficiency the highest.Therefore, the length of antenna will be that wavelength decides according to the frequency of transmitting and receiving signal.According to the formula (1) and the formula (2) that calculate oval arm size, the minor axis length that can draw the single oval arm of dipole antenna of the present utility model is 60mm, and long axis length is 80mm.When adjusting the working frequency range of dipole antenna, can correspondingly adjust by the long and short shaft size of adjusting oval arm according to formula (1) and formula (2) according to the actual conditions needs.

$\mathrm{\λ}=\frac{c}{f}---\left(1\right)$

${\mathrm{\λ}}^{\′}=\frac{\mathrm{\λ}}{4}---\left(2\right)$

Two dipole arm 1A, 1B connect by feed connection 3 as shown in Figure 2.The inner core 31 of feed connection 3 is holding wires, and four pins 32 are ground pin on every side.Dipole arm 1A is connected with inner core 31, and another dipole arm 1B is connected with one of them pin 32.

Distance between two dipole arm 1A, the 1B is by the inner core 31 of feed connection 3 and the distance decision between the ground pin 32.In the present embodiment, feed connection 3 is a sub-miniature A connector, and then the distance between two dipole arm 1A, the 1B is 1.5mm.Dipole antenna is connected with coaxial cable by feed connection 3, and the effect of feed connection 3 is to make antenna feed place and coaxial cable impedance matching.Usually, the impedance of coaxial cable is 50 Ω, and therefore, the input impedance of feed connection 3 also is 50 Ω.

Fig. 3 is oval dipole antenna S11 of the present utility model emulation and test data figure, and wherein solid line is represented emulated data among the figure, and dotted line is represented test data.As can be seen from Figure 3, oval dipole antenna of the present utility model-10dB bandwidth can cover 800MHz～6.0GHz, covers all band limits of present moving communicating field, the mobile band scope of the 800MHz～3GHz that is particularly useful for using always; Its relative bandwidth is about 5.2GHz (76.5%), belongs to ultra-wideband antenna.

Fig. 4 is oval dipole antenna voltage standing wave ratio of the present utility model (VSWR) emulated data figure.As shown in Figure 4, in the working band scope of 800MHz～6.0GHz, the voltage standing wave ratio VSWR of oval dipole antenna of the present utility model can receive the small-signal in the free space well all less than 2.

Oval dipole antenna relative bandwidth of the present utility model is big, have ultra wideband, and its working band covers all band limits of present moving communicating field, the mobile band scope of the 800MHz～3GHz that is particularly useful for using always.In addition, oval dipole antenna of the present utility model is a flat plane antenna, and its diameter has only 136mm, the manufactured materials that uses is comparatively common, has the advantage that volume is little, in light weight, be convenient for carrying, be convenient to processing and manufacturing, therefore can be widely used in the mobile radio system, be particularly useful in the mobile communication system of small portable, for example can use as test antenna in portable terminal Electromagnetic Compatibility test macro, it can detect the small-signal that is produced during tested in the free space.

The above, it is preferred embodiment of the present utility model, be not that the utility model is done any pro forma restriction, any those skilled in the art, in not breaking away from the technical solutions of the utility model scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solutions of the utility model, to any simple modification, equivalent variations and modification that above embodiment did, all still belong to the scope of technical solutions of the utility model according to technical spirit of the present utility model.

Claims (7)

1, a kind of dipole antenna comprises medium chassis, two dipole arm and feed connection,

It is characterized in that,

Described two dipole arm are oval;

And described two dipole arm are attached at the same side surface on medium chassis, also continuous by described feed connection.

2, dipole antenna as claimed in claim 1 is characterized in that, two oval dipole arm sizes are consistent.

3, dipole antenna as claimed in claim 2 is characterized in that, the major axis of two oval dipole arm is 80mm, and minor axis is 60mm.

4, dipole antenna as claimed in claim 1 is characterized in that, described medium chassis is circular.

5, dipole antenna as claimed in claim 4 is characterized in that, the diameter on circular medium chassis is 136mm, and thickness is 1.6mm.

As claim 1,4 or 5 described dipole antennas, it is characterized in that 6, described medium chassis is made by epoxy resin.

7, dipole antenna as claimed in claim 1 is characterized in that, described feed connection is a sub-miniature A connector.

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