CN201523080U

CN201523080U - Broadband omnidirectional antenna for mobile communication

Info

Publication number: CN201523080U
Application number: CN2009201010147U
Authority: CN
Inventors: 杨晓冬; 李迎松; 刘乘源; 李渠塘
Original assignee: Harbin Engineering University
Current assignee: Harbin Engineering University
Priority date: 2009-09-29
Filing date: 2009-09-29
Publication date: 2010-07-07
Anticipated expiration: 2019-09-29

Abstract

The utility model provides a broadband omnidirectional antenna for mobile communication, which comprises a feed cable, an upper vibrator, a lower vibrator and a fixed base. The lower vibrator is fixed on the fixed base, the upper vibrator is supported on the upper vibrator through a polytetrafluoroethylene column, the upper vibrator and the lower vibrator are connected via a short circuit conducting wire, an outer conductor of the feed cable is connected with the lower vibrator to form a negative feed end, and an inner conductor of the feed cable is connected with the upper vibrator to form a positive feed end. The broadband omnidirectional antenna has relatively high radiation efficiency, increases communication quality, improves communication environments and improves antenna broadband impedance matching. Impedance bandwidth is simple in structure, easy in production, low in cost and convenient for batch production.

Description

A kind of broadband omni-directional antenna that is used for mobile communication

(1) technical field

The utility model relates to a kind of antenna that is applied to communicate by letter, conduct transmits and receives the broadband omni-directional antenna of radio signal in interior all communication networks of specifically a kind of moving communicating field.

(2) background technology

Because radio communication equipment and electronic message unit be towards multifunction, miniaturization, ultra broadband and the friendly direction of coordinating with surrounding environment develop, and this makes broadband, and miniaturization becomes one of hot subject of domestic and international research.It relates to the wideband impedance match technology of antenna, the loading technique of antenna, the reactance compensation technique of antenna, the advanced technology and the technologies such as optimal design of miniature antenna profile.Be suitable for the design of the miniature antenna broadband matching network that the different districts signal covers and the integrated design of multiband common antenna, also become one of focus of present research.The antenna of a plurality of frequency ranges is integrated into a kind of antenna structure, and the design ultra-wideband antenna is a kind of trend of current technical development, also is the major impetus that realizes device miniaturization.Antenna product in the past is to design at different working frequency range, and stock size and volume are all bigger, variant communication system independent design, can be compatible or compatible degree depend on the bandwidth and the cost of antenna system.And development product all is the directional antenna product, though broadband omni-directional antenna product few in number, complex structure are also arranged, design loaded down with trivial detailsly, versatility is poor, the processing cost height, and there is certain defective in performance, should not promote, this mobile communication cells covers and has caused certain degree of difficulty, therefore develops multiband, miniaturization, simple in structure, flexible design, broadband omni-directional antenna with low cost are the most important things of current research.

(3) summary of the invention

The purpose of this utility model is to provide a kind of multiband, miniaturization, a kind of broadband omni-directional antenna that is used for mobile communication simple in structure, with low cost.

The purpose of this utility model is achieved in that

Comprise feeder cable, last oscillator, following oscillator, firm banking, following oscillator is fixed on the firm banking, last oscillator is supported on the oscillator top by the polytetrafluoroethylene post, be connected by short-circuit conductors between last oscillator and the following oscillator, the outer conductor of feeder cable connects and composes the negative sense feed end with following oscillator, and the inner wire of feeder cable and last oscillator connect and compose the feedforward end.

The utility model can also comprise:

1, described upward oscillator and following oscillator are the ladder grading structure, last oscillator, following oscillator are connected on copper pipe and the following copper pipe, described polytetrafluoroethylene post is supported between copper pipe and the following copper pipe, described firm banking comprises firm banking and following firm banking, last copper pipe links to each other with upper bed-plate, following copper pipe links to each other with lower bottom base, and feeder cable passes down firm banking and enters down copper pipe.

2, upward the edge of oscillator has two compensating plates.

3, the edge of oscillator has a slice compensating plate down, and the upper end of this compensating plate has insulator cap.

4, down firm banking is installed in fixedly on the channel-section steel, is covered with radome at last firm banking, time firm banking.

5, described oscillator down is the ladder grading structure, and last oscillator is a conical structure.

Distinguishing feature of the present utility model is mainly reflected in: (1) the utility model utilizes the broadband character of biconical antenna, designs a broadband omni-directional antenna, and bandwidth of the present utility model surpasses 110%, and higher radiation efficiency is arranged.(2) the utility model is a omnidirectional antenna, can be installed in the Plastic Drum and the radome of Any shape in, directional diagram is more satisfactory, can cover whole space, CURRENT DISTRIBUTION is even, the covering of realization non-blind area has improved communication quality greatly, has improved communication environment.(3) the utility model direct-current short circuit grounding technology and reactance compensation technique are improved the broadband impedance matching of antenna, increase the bandwidth of operation of antenna.(4) the utility model uses copper pipe organization center supporting construction up and down, is convenient to feed, and feeder cable passes through from the inside of center copper pipe simultaneously, has avoided the leakage of electromagnetic wave when high frequency, improves the radiation efficiency of antenna.Can improve current feed phase by changing the trend of feeder cable simultaneously, improve the deviation in roundness of directional diagram.(5) the utility model adopts the channel-section steel supporting antenna, not only takes into account the antenna of stable supported design, plays choking effect simultaneously, improves the impedance bandwidth of antenna.(6) antenna that the utility model proposes, two firm bankings adopt rubber to make up and down, do not advance the well antenna of supported design, can guarantee that antenna performance in the process of transportation is constant simultaneously, play cushioning effect.(7) antenna that the utility model proposes, its feeder line passes through from copper pipe inside, center, is convenient to antenna array, changes the beamwidth of antenna simultaneously.(8) antenna structure that the utility model proposes is simple, flexible design, can optimize corresponding antenna size according to different radomes, is convenient to actual production and popularization.(6) the utility model adopts thin Copper Foil conduct oscillator up and down, adopts coaxial feed simultaneously, and material is easy, produces easily, and cost is low, is convenient to produce in batches.

(4) description of drawings

Fig. 1 is a basic structure schematic diagram of the present utility model;

Fig. 2 is the structural representation of another execution mode of the utility model.

(5) embodiment

For example the utility model is done description in more detail below in conjunction with accompanying drawing:

Embodiment 1:

In electronic apparatus systems such as modern communications, antenna of a great variety, biconical antenna has obtained using widely with its good broadband character.But it makes comparatively complicated, and cost is higher, and bandwidth can not well satisfy mobile communication (800～2500MHz) demand.Compare with common biconical antenna, this antenna overall width is generally the half wavelength of the lower frequency limit of design of communications frequency band, and this programme is in order to realize the demand of miniaturization Design, and the actual size that adopts is far smaller than λ _Max/ 2 (λ _MaxFor the farm labourer of service band makes wavelength), in this embodiment, the maximum caliber (being the Breadth Maximum of antenna) that we adopt is 116mm, is far smaller than normal λ _Max/ 2.Adopt the trapezoidal gradual change degeneration conical structure that does not wait simultaneously, size is further dwindled, and size of circular cone only is 0.2 λ on it _MaxThe height of this all channel antenna can change along with trapezoidal variation, to adapt to different installation environment demands.This broadband omni-directional antenna is convenient to fixing and design in the group battle array, and can overcome the pattern distortion that brings because of the group battle array.

This example adopt as shown in Figure 1 make oscillator 2 and following oscillator 5 than thin copper foil or single-side coated copper plate, can not only play good radiation effect like this, play a supporting role simultaneously.The simple feed structure that present case adopts is that main feeder 17 is by fixedly channel-section steel 13 and following firm banking 12 enter down copper pipe 11 to the radiating element feed.Radiating element is made up of last oscillator 2 and following oscillator 5, and its essential characteristic is: go up oscillator 2 and following oscillator 5 and form feed in the centre by feeder cable 17.Being provided with polytetrafluoroethylene post 15 between last oscillator 2 and the following oscillator 5 supports, two copper pipes up and down that polytetrafluoroethylene post 15 is used for supporting simultaneously, last copper pipe 7 is used for supporting oscillator 2, following copper pipe 11 is used for supporting down oscillator 5, middle with 15 connections of polytetrafluoroethylene post, last copper pipe 7 and following copper pipe 11 constitute supporting constructions with upper bed-plate 8 and lower bottom base 12 respectively.The center copper pipe plays multiple action: as supporting construction, and oscillator 2 and following oscillator 5 in the stable support; Support as feed, the outer conductor 16 of feeder cable is connected with following oscillator 5 by the hole on the copper pipe, constitute negative oscillator, another pillar as feed, the inner wire 14 of feeder cable 17 (tape insulation medium) joins with last oscillator, constitute positive oscillator, thereby oscillator constitutes a pair of doublet unit up and down, for the dipole feed, play the effect of Ba Lun conversion; Coaxial cable 17 passes through from the inside of following center copper pipe 11, has effectively avoided the antenna effect of coaxial cable when high frequency, electromagnetic energy is shielded in the copper pipe of center, effective like this influence that improves the radiation effect of coaxial cable to directional diagram.There are compensating

plate

1 and 3 in the edge of last oscillator 2, and compensating plate 10 comprehensive compensations are because of the inner wire 14 long inductive effects that cause of coaxial cable 17, and the upper end of compensating plate 10 has insulator cap 6, prevents to cause direct short-circuit.Short-circuit conductors 4 directly connects oscillator up and down, constitutes the DC channel structure, has increased bandwidth.

Entire antenna has upper bed-plate 8, lower bottom base 12, and polytetrafluoroethylene post 15, last copper pipe 7, following copper pipe 11 constitutes supporting construction, and is installed in the radome 9 (PVC or glass-reinforced plastic material).

This antenna designs is simple, and flexible design can satisfy different design requirements, particularly can be used in the mobile communication as embellished antenna.Such as: be used in Lawn lamp, street lamp, mushroom lamp etc. beautifies provides good omnidirectional radiation characteristic in the communication.

Embodiment 2:

As shown in Figure 2, oscillator 2 is changed to a little circular cone on the antenna of design, following oscillator 5 still adopts the ladder grading structure, main feeder cable 17 is given the oscillator feed by fixed head 12, the outer conductor of its feeder cable 17 constitutes the negative sense feed end by connecing the locking copper sheathing with following oscillator 5, and its inner wire and last oscillator 2 constitute the feedforward end.Be provided with dielectric support post 15 between last oscillator 2 and the following oscillator 5.Short-circuit conductors (short bar) 4 direct and last oscillator 2 and following oscillator 5 short circuits, thus bandwidth increased.Total is fixed up entire antenna by plastic bolt and plastic nut.The total solder joint is fewer, therefore more helps improving passive intermodulation.The antenna of design can be used as the ceiling light antenna, also can be used as Lawn lamp simultaneously and uses.

Claims

1. broadband omni-directional antenna that is used for mobile communication, comprise feeder cable, last oscillator, following oscillator, firm banking, it is characterized in that: following oscillator is fixed on the firm banking, last oscillator is supported on the oscillator top by the polytetrafluoroethylene post, be connected by short-circuit conductors between last oscillator and the following oscillator, the outer conductor of feeder cable connects and composes the negative sense feed end with following oscillator, and the inner wire of feeder cable and last oscillator connect and compose the feedforward end.

2. a kind of broadband omni-directional antenna that is used for mobile communication according to claim 1, it is characterized in that: the described oscillator of going up is the ladder grading structure with following oscillator, last oscillator, following oscillator are connected on copper pipe and the following copper pipe, described polytetrafluoroethylene post is supported between copper pipe and the following copper pipe, described firm banking comprises firm banking and following firm banking, last copper pipe links to each other with upper bed-plate, and following copper pipe links to each other with lower bottom base, and feeder cable passes down firm banking and enters down copper pipe.

3. a kind of broadband omni-directional antenna that is used for mobile communication according to claim 2 is characterized in that: the edge of going up oscillator has two compensating plates.

4. according to claim 2 or 3 described a kind of broadband omni-directional antennas that are used for mobile communication, it is characterized in that: the edge of following oscillator has a slice compensating plate, and the upper end of this compensating plate has insulator cap.

5. according to claim 2 or 3 described a kind of broadband omni-directional antennas that are used for mobile communication, it is characterized in that: following firm banking is installed in fixedly on the channel-section steel, at last firm banking, firm banking is covered with radome down.

6. a kind of broadband omni-directional antenna that is used for mobile communication according to claim 4 is characterized in that: following firm banking is installed in fixedly on the channel-section steel, at last firm banking, firm banking is covered with radome down.

7. a kind of broadband omni-directional antenna that is used for mobile communication according to claim 1 is characterized in that: described oscillator down is the ladder grading structure, and last oscillator is a conical structure.