CN201298591Y

CN201298591Y - Broadband omnidirectional antenna with low gain

Info

Publication number: CN201298591Y
Application number: CNU2008201605478U
Authority: CN
Inventors: 邢红兵; 徐燕; 李渠塘
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-09-27
Filing date: 2008-09-27
Publication date: 2009-08-26
Anticipated expiration: 2018-09-27

Abstract

The utility model relates to a broadband omnidirectional antenna with low gain. A main feed line (6) is used for feeding a main oscillator, wherein, the main oscillator comprises an upper oscillator (12) and a lower oscillator (13), the lower ports (32) of the upper oscillator(12) and the lower oscillator (13) are in short connection, and a small plastic fixing plate (5) is arranged between the lower ports thereof; a hollow copper pipe (4) penetrates the main oscillator, an inner layer sleeve (8) and an outer layer sleeve (7) are respectively sleeved outside the copper pipe (4), two layers of media ring block (14) are added in the inner layer sleeve (8) of the upper oscillator (12), the thickness of the inner layer sleeve is adjustable, and the space between the two layers of media ring block is also adjustable; moreover, a dielectric radome (3) is arrange at the outer part of the main oscillator, an upper positioning cover (1) and a lower positioning cover (2) are arranged on both ends of the radome (3), and a central copper pipe (4) passes through the lower positioning cover (2). A gradual transition form is adopted in the middle initial section of the main oscillator, and an included angle of the transitional part and the central copper pipe (4) is 30 DEG to 45 DEG.

Description

The low gain broadband omni-directional antenna

Technical field

The utility model relates to a kind of low gain broadband omni-directional antenna, be applied to communication, in the moving communicating field in all communications network systems as sending out or/and the usefulness that receives radio signals, affiliated technical field: radio communication equipment, Electromagnetic Field and Microwave Technology, mobile communication antenna.

Background technology

Because radio communication equipment and electronic equipment are towards multi-functional, miniaturization, ultra broadband and the friendly direction of coordinating with surrounding environment develop, this makes broadband, the research of miniature antenna becomes the hot subject of domestic and international mobile communications industry, it relates to the loading and the reactance compensation technique of antenna, the optimal design of miniature antenna external form, 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, a plurality of frequency ranges are integrated into a kind of trend that a kind of antenna structure is current antenna technology development, also are the motive forces that realizes device miniaturization.Antenna product in the past is to design at different working frequency range, stock size and volume are all bigger, variant communications network system independent design, whether compatible or compatible degree depend on the bandwidth and the corresponding performance of antenna system, frequency of utilization and road device during some communication products system integration, be not easy to install, improved cost, and the exploitation all be the directional antenna product, though also promising number broadband omni-directional antenna product seldom, complex structure, processing cost is higher, and have some defectives on the performance, and should not promote, cover to mobile communication cells like this and caused certain degree of difficulty, therefore develop the multiband miniaturization, simple in structure, power saving reduces discharging, and broadband omni-directional antenna with low cost is very necessary.

The utility model content

The purpose of this utility model is to overcome the deficiency of above-mentioned prior art and a kind of low gain broadband omni-directional antenna is provided.

Main feeder 6 of the present utility model is given the main element feed, main element comprises oscillator 12 and following oscillator 13, it is characterized in that: go up oscillator 12, down oscillator 13 lower port 32 short circuits together and between be provided with fixedly shallow bid 5 of plastics, in the middle of main element, be installed with the copper pipe 4 of hollow, copper pipe 4 outsides are with inner layer sleeve 8 and outer layer sleeve 7 respectively, in the inner layer sleeve 8 of last oscillator 12, be added with two layer medium ring piece 14, external agency radome 3 at main element, be provided with upper and

lower location lid

1 and 2 at the two ends of radome 3, center copper pipe 4 passes down the location and covers 2.The initial segment adopts the gradual transition form in the middle of the main element, and the gradual change part is 30 °-45 ° with the angle of center copper pipe 4.Dielectric ring piece 14 is made by the tetrafluoro hexene.The thickness of dielectric ring piece 14 is adjustable, and the spacing of two layer medium ring piece 14 also is adjustable.Vertical large compensation sheet 9 is connected to the outer wall of outer sleeve 7, and the horizontal line at vertical main element center; Angle in oscillator formation up and down is provided with vertical little compensating plate 10 and slope compensation sheet 11, the two ends of slope compensation sheet 11 are connected to the outer wall of oscillator up and down, with the opposite side of slope compensation sheet 11 symmetries vertical little compensating plate 10 is arranged, the two ends of vertical little compensating plate 10 are connected to the outer wall of oscillator up and down.

Beneficial effect:

1, because this antenna has adopted thick oscillator and transition and the measure of two sleeve reactance compensation, not only guaranteed wide band impedance matching property, reduced the size of radiating element simultaneously greatly, more helped power saving and reduce discharging.

2, in antenna structure, the copper pipe of hollow plays triple role:

A, supporting antenna radiant body

B, feeder line penetrate from hollow copper pipe and pass, in pipe, lay, prevented the influence of feeder line effectively to radiation pattern, the feeder line radiating element can be moved freely along this pipe help changing array element distance and current feed phase, reach and change pattern characteristics easily, the purpose of adjusting antenna beamwidth.

C, it plays a part double-layer coaxial chokes sleeve inner wire, and the dielectric-sleeve that is enclosed within simultaneously above it plays tunning effect, has saved multiple compensating plate, has kept radiating doublet symmetry structurally, thereby makes antenna have good directivity and uniformity.

Figure of description

Fig. 1 is the structural representation of the utility model embodiment 1;

Fig. 2 is a main element structural representation of the present utility model.

Embodiment

Below with reference to drawings and Examples the technical solution of the utility model is described in detail.

Fig. 1, Fig. 2, wherein 1 is last location lid, 2 for locating lid down, 3 is radome, and 4 is copper pipe, and 5 are the fixing shallow bid of plastics, 6 is main feeder, and 7 is outer layer sleeve, and 8 is inner layer sleeve, 9 is the large compensation sheet, and 10 is little compensating plate, and 11 is the slope compensation sheet, 12 is last oscillator, and 13 are following oscillator, and 14 is the dielectric ring piece, 31 is upper port, and 32 is lower port, and 34 is distributing point.

Signal from communication equipment is given the main element feed through main feeder 6, main element comprises oscillator 12 and following oscillator 13, last oscillator 12, lower port 32 short circuits of following oscillator 13 together and between be provided with fixedly shallow bid 5 of plastics, in the middle of main element, be installed with the copper pipe 4 of hollow, copper pipe 4 outsides are with inner layer sleeve 8 and outer layer sleeve 7 respectively, outer layer sleeve 7 and inner layer sleeve 8 form the primary radiation unit of multiple-frequency operation, double layer sleeve barrel is connected to the copper pipe 4 of hollow in upper port 31, play the effect of double-deck strategic point stream, remedied because the weak shortcoming of the long upper end of main element electric current, make electric current form the loop, thereby make the electric current on the antenna be row wavelength-division cloth, reduced the reflection of electric current, this is one of reactance compensation measure.Last oscillator 12, down oscillator 13 lower port 32 short circuits together and between be provided with fixedly shallow bid 5 of plastics, and jointly by coaxial feeding.Following oscillator 13 is connected on the center copper pipe 4 in upper port 31, because coaxial line can be realized the radiation of energy when high frequency, be equivalent to antenna, adopt this kind mount scheme, the copper pipe 4 of hollow can mask the outside electromagnetic radiation energy of coaxial line, and the sub-feed of electrode couple, played the effect of Ba Lun.This dipole is approximate to work in 1/2 wavelength, and outer layer sleeve 7 sizes design low-frequency range, and inner layer sleeve 8 sizes design at high frequency.Following two-layer sleeve is as the negative pole of main element, and this structure is a kind of doublet unit.In the inner layer sleeve 8 of last oscillator 12, be added with two layer medium ring piece 14 (generally making) with the tetrafluoro hexene, can further debug characteristic impedance of antenna, make the input impedance of antenna approach 50 ohm, be complementary with the axis characteristic impedance, this is two of a reactance compensation, the thickness of this dielectric ring piece 14 is adjustable till frequency generation resonance promptly mates the best, the spacing of two layer medium ring piece 14 also is adjustable, in order further to improve coupling, can increase vertical large compensation sheet 9 and vertical little compensating plate 10 and slope compensation sheet 11; Vertical large compensation sheet 9 is connected to the outer wall of outer sleeve 7, and the horizontal line at vertical main element center; Angle in oscillator formation up and down is provided with vertical little compensating plate 10 and slope compensation sheet 11, the two ends of slope compensation sheet 11 are connected to the outer wall of oscillator up and down, slope compensation sheet 11 links together on electric with distributing point 34, with the opposite side of slope compensation sheet 11 symmetries vertical little compensating plate 10 is arranged, the two ends of vertical little compensating plate 10 are connected to the outer wall of oscillator up and down.In order to improve impedance matching, The initial segment adopts the gradual transition form in the middle of the main element, and the gradual change part is 30 °-45 ° with the angle of center copper pipe 4.At the external agency radome 3 of oscillator, it is the outer cover of the protection antenna made by PVC grog or glass reinforced plastic pipe, generally requires it little to the decay of electromagnetism; mechanical strength is good; environmental suitability is strong, utilizes upper and

lower location lid

1 and 2 to encapsulate at last, and center copper pipe 4 passes down the location and covers 2.

The advantage of this oscillator is compact conformation, is easy to install and fix, and realizes multiple-frequency operation on same structure, is convenient to the system integration.

Though the utility model with preferred embodiment openly as above; but they are not to be used for limiting the utility model; anyly have the knack of this skill person; in the spirit and scope that do not break away from the utility model; can do various variations or retouching from working as, what therefore protection range of the present utility model should be defined with the application's claim protection range is as the criterion.

Claims

1, a kind of low gain broadband omni-directional antenna, main feeder (6) is given the main element feed, main element comprises oscillator (12) and following oscillator (13), it is characterized in that: go up oscillator (12), lower port (32) short circuit of following oscillator (13) together and between be provided with fixedly shallow bid (5) of plastics, in the middle of main element, be installed with the copper pipe (4) of hollow, copper pipe (4) outside is with inner layer sleeve (8) and outer layer sleeve (7) respectively, in the inner layer sleeve (8) of last oscillator (12), be added with two layer medium ring piece (14), external agency radome (3) at main element, two ends at radome (3) are provided with, following location lid (1) and (2), center copper pipe (4) pass down location lid (2).

2, low gain broadband omni-directional antenna according to claim 1 is characterized in that: The initial segment adopts the gradual transition form in the middle of the main element, and the gradual change part is 30 °-45 with the angle of center copper pipe (4).

3, low gain broadband omni-directional antenna according to claim 1 is characterized in that: dielectric ring piece (14) is made by the tetrafluoro hexene.

4, low gain broadband omni-directional antenna according to claim 1 is characterized in that: the thickness of dielectric ring piece (14) is adjustable, and the spacing of two layer medium ring piece (14) also is adjustable.

5, low gain broadband omni-directional antenna according to claim 1 is characterized in that: the outer wall at outer sleeve (7) also is provided with vertical large compensation sheet (9), the horizontal line at the vertical vertical main element of large compensation sheet (9) center; Angle in oscillator formation up and down is provided with vertical little compensating plate (10) and slope compensation sheet (11), the two ends of slope compensation sheet (11) are connected to the outer wall of oscillator up and down, with the opposite side of slope compensation sheet (11) symmetry vertical little compensating plate (10) is arranged, the two ends of vertical little compensating plate (10) are connected to the outer wall of oscillator up and down.