CN101197469B

CN101197469B - Four-frequency broadband antenna feeder unit

Info

Publication number: CN101197469B
Application number: CN2007101885835A
Authority: CN
Inventors: 肖良勇; 赵玉军; 俱新德; 张培团; 刘军州; 张建民
Original assignee: XI'AN HAITIAN ANTENNA SCI-TECH Co Ltd
Current assignee: Xi'an Haitian Antenna Technologies Co., Ltd.
Priority date: 2007-12-12
Filing date: 2007-12-12
Publication date: 2011-08-24
Anticipated expiration: 2027-12-12
Also published as: CN101197469A

Abstract

The invention provides a broad band basic antenna feeder unit, mainly solving the problem of the narrowness of the prior antenna brand. The dipole of the antenna feeder unit has an integral structure of two radiation arms (5) and (6) being vertical and flush with a supporting plate (7), with a gap (8) formed between the dipole. The two radiation arms (5, 6) are fixed with a parasitic element each and use a micro stripline (2) position in the centers of the dipole radiation arms and the supporting plate to feed, with the dipole radiation arms being symmetric relative to the supporting plate, the micro antenna and the ground. Broad band can be obtained through the adjustment of the length L1 and the width W1 of the radiation arms, the width W6 of the supporting plate, the width S and the length L5 of the gap, the length L2 and the width W2 of the parasitic elements, and the distance W5 between the two radiation arms. Tests show that the working frequency band of the invention is 1710-2500MHz, with a relative bandwidth of 37.5 percent and that the invention can be used as the basic antenna feeder unit of the mobile communication base station antennae.

Description

Four-frequency broadband antenna feeder unit

Technical field

The invention belongs to antenna technical field, particularly a kind of broadband four frequently basic air feedback units are used to make antenna of mobile communication base station.

Technical background

Mobile communication had obtained developing rapidly in recent years, in order better being ever-increasing user's service, not only will to provide cheap and good-quality communication equipment to them, and multiple broadband services service will be provided.Antenna is the important component part of mobile communication equipment, in order to adapt to developing rapidly of market, not only will reduce the production cost of antenna, and wants the bandwidth of operation of extended antenna.Operator not only wishes can be in 1710-1880MHz, 1850-1990MHz and three frequency range work of 1920-2170MHz with an antenna, and wish that antenna can that is to say the function of wishing can realize simultaneously with a antenna four frequency antennas simultaneously in the work of 2.4GHz WLAN frequency range.But existing three antenna for base station frequently on the market can only cover the working frequency range of 1710-2170MHZ, can't cover the working frequency range of 2.4GHz WLAN.

The content of invention

The objective of the invention is to overcome the deficiency that the basic air feedback unit that has the antenna for base station use now can only cover the working frequency range of three frequency antenna for base station, provide a kind of four-frequency broadband basic air feedback unit, to realize working frequency range covering to working frequency range and the 2.4GHz WLAN of 1710-2170MHZ.

For achieving the above object, four-frequency broadband antenna feeder unit provided by the invention, comprise symmetrical dipole, little band, ground plate, wherein symmetrical dipole adopts the vertical coplane integrative-structure with supporting bracket of radiation arm, this microstrip line is fixed on the center of two radiation arms and supporting bracket, be fixed with parasitic element on this radiation arm, with further widening frequency band.

Have the slit between the described radiation arm, the length L 5 in this slit is greater than the width W 1 of symmetrical dipole radiation arm.Width S=the 1-3mm in slit.

Described microstrip line adopts little down big " protruding " shape structure that, to realize wideband impedance match.

The ground of described supporting bracket and one of them radiation arm double as microstrip line, constitute microstrip transmission lines with microstrip line, the upper end of microstrip line links to each other with radiation arm, and the lower end links to each other with the inner wire of coaxial line, finishes the feed of giving symmetrical dipole with microstrip transmission lines.

The length of described microstrip line, width, the length of symmetrical radiation arm, width, apart from the height of ground plate, and gap length, width between two radiation arms be adjustable, makes antenna have broadband character.

The present invention has following advantage:

1. owing to adopt the vertical coplane ground connection of two symmetrical radiation arms of symmetrical dipole with supporting bracket, and microstrip line just in time is positioned at the center of symmetrical dipole and supporting bracket again, make two relative supporting brackets of symmetrical radiation arm, band line and the ground structure symmetry of symmetrical dipole, distributed capacitance is identical, constitute Ba Lun, finish unbalanced line and give the mapping function of the desired imbalance of symmetrical antenna feed to balance;

2. owing on radiation arm, be fixed with parasitic element, further broadening frequency band;

3. because the radiation arm of symmetrical dipole and support, microstrip line 2, parasitic element 3 all can be used the aluminium sheet manufacturing, reduce cost, alleviated weight;

4. because employing is fixed on supporting bracket on the U type ground plate that material is an aluminium sheet with the aluminium rivet staking, belong to, help reducing passive third order intermodulation and disturb with a kind of metal close contact.

Actual measurement shows that the present invention can cover the working frequency range of 1710--2500MHz, at the 1710-2500MHz module gain greater than 9db, elementary cell VSWR≤1.45, HPBW _H=65 ° ± 6 °.The eight-element dipole array battle array, VSWR≤1.38.

The purpose of this utility model, feature and advantage elaborate in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is the perspective view of air feedback unit of the present invention;

Fig. 2 is an air feedback unit floor map of the present invention;

Fig. 3 is the VSWR frequency characteristic curve diagram of air feedback unit of the present invention;

Fig. 4 is the VSWR frequency characteristic curve diagram that the present invention forms the eight-element dipole array battle array;

Fig. 5 is measured level face and the elevation radiation patytern of the present invention at f=1710MHz;

Fig. 6 is measured level face and the height pattern of the present invention at f=2050MHz.

Embodiment

Referring to Fig. 1 and Fig. 2, four frequency air feedback units of the present invention are made up of symmetrical dipole 1, supporting bracket 7, microstrip line 2, parasitic element 3 and U type ground plate 4.Wherein:

Symmetrical dipole 1 is made up of

symmetrical radiation arm

5,6,

symmetry radiation arm

5,6 is vertical with supporting bracket 7 coplanes, the lower end of supporting bracket 7 is bent on parallel mounting panel 12 these mounting panels and has two installing holes 9, by the aluminium rivet staking symmetrical dipole is vertically fixed on the U type ground plate 4.The centre of symmetrical

dipole radiation arm

5,6 is that L5, width are that the slit 8 of S separates by length, and the length of each radiation arm of symmetrical dipole is that L1, broadband are W1, and the length overall of symmetrical dipole is L=2L1+S, is generally 0.5 λ ₀, λ ₀Be centre wavelength.

Parasitic element 3 is riveted on the

radiation arm

5,6 of symmetrical dipole by insulation lath 11 by rivet 13, impedance bandwidth with further expansion antenna, length, the width of parasitic oscillator unit are respectively L2 and W2, the spacing of parasitic oscillator unit and

symmetrical radiation arm

5,6 is W5, this L2, W2 and W5 are all adjustable, to realize wideband impedance match.

Microstrip line 2 adopts little down big " protruding " shape structure that, promptly the metal tape that is respectively L3, W3 and L4, W4 by two joint length and widths is formed, purpose is for impedance matching, the radiation arm 5 of the upper end of this microstrip line 2 by plastic screw 10 via holes and symmetrical dipole with link to each other, the lower end links to each other (not drawing in aperture, the coaxial line or belt line chart) with the inner wire or the band line of coaxial line by the aperture above the U type ground plate 4, finishes the feed task of giving symmetrical dipole with band line transmission line.

Adjust the length L 1 of symmetrical dipole radiation arm and the width W 6 between width W 1, height, microstrip line 2 and the supporting bracket 7 apart from d, supporting bracket 7 apart from ground plate, particularly adjust the length L 5 and the width S in slit 8 between the symmetrical radiation arm, antenna is mated in broad frequency range.The length L 5 in this slit must be greater than the width W 1 of symmetrical dipole radiation arm, the width S=1-3mm in slit 8.

Fig. 3 is the actual measurement VSWR frequency characteristics of the present invention's four frequently basic air feedback units, is found out by Fig. 3, in 1710---2500MHz frequency range VSWR≤1.45;

Fig. 4 is the VSWR band characteristic curve with the eight-element dipole array battle array of the present invention's four frequently basic air feedback units formations, as seen from Figure 4, in the 1710--2500MHz frequency range, VSWR≤1.38.

Fig. 5 is horizontal plane and the elevation radiation patyterns of the present invention's four frequency antennas in the 1710MHz actual measurement, can be obtained horizontal plane half-power beam width HPBW by Fig. 5 _H=70.8 °,

Fig. 6 is horizontal plane and the elevation radiation patyterns of the present invention's four frequency antennas in the 2050MHz actual measurement, can be obtained horizontal plane half-power beam width HPBW by Fig. 6 _H=62.5 °.

Claims

1. four-frequency broadband antenna feeder unit, comprise symmetrical dipole, microstrip line, ground plate, it is characterized in that symmetrical dipole adopts two radiation arms (5,6) and the vertical coplane integrative-structure of a supporting bracket (7), microstrip line (2) is fixed on the center of two radiation arms and supporting bracket, the centre of symmetrical dipole radiation arm (5,6) is that L5, width are that the slit (8) of S separates by length, the length L 5 in this slit must be greater than the width W 1 of symmetrical dipole radiation arm, the width S=1-3mm of slit (8); The length of each radiation arm of symmetrical dipole is that L1, broadband are W1, and the length overall of symmetrical dipole is L=2L1+S, and L is 0.5 λ ₀, λ ₀Be centre wavelength; Adjust the length L 1 of symmetrical dipole radiation arm and the width W 6 between width W 1, height, microstrip line (2) and the supporting bracket (7), antenna is mated in broad frequency range apart from d, supporting bracket (7) apart from ground plate.

2. four-frequency broadband antenna feeder unit according to claim 1 is characterized in that being fixed with parasitic element (3) on two radiation arms (5,6), with further widening frequency band.

3. want 1 described four-frequency broadband antenna feeder unit according to right, it is characterized in that microstrip line (2) adopts little down big " protruding " shape structure that, to realize wideband impedance match.

4. four-frequency broadband antenna feeder unit according to claim 1, the ground that it is characterized in that a part of double as microstrip line of supporting bracket (7) and radiation arm (5,6), constitute microstrip transmission line with microstrip line, the upper end of microstrip line links to each other with radiation arm (5), the lower end links to each other with the inner wire of coaxial line, finishes the feed of giving symmetrical dipole with microstrip transmission line.

5. four-frequency broadband antenna feeder unit according to claim 2 is characterized in that the length L 2 of parasitic element, width W 2 and and radiation arm between spacing W5 all adjustable..

6. four-frequency broadband antenna feeder unit according to claim 1 is characterized in that adopting between supporting bracket (7) and the ground plate (4) the aluminium rivet staking to be connected, and is beneficial to reduce the interference of passive third order intermodulation.