CN2727985Y

CN2727985Y - Wideband printed wide-slot antenna element

Info

Publication number: CN2727985Y
Application number: CN 200420041837
Authority: CN
Inventors: 张厚; 任辉; 张培团; 俱新德
Original assignee: XI'AN HAITIAN ANTENNA SCI-TECH Co Ltd
Current assignee: XI'AN HAITIAN ANTENNA SCI-TECH Co Ltd
Priority date: 2004-04-26
Filing date: 2004-04-26
Publication date: 2005-09-21
Anticipated expiration: 2014-04-26

Abstract

The utility model discloses a wideband printed wide-slot antenna element. The utility model is mainly composed of a medium base plate 2, a microstrip feeder line 6, a U-shaped explorer 7, a wide slot 4, a coaxial feeder line 8, a parasitic conductor board 3 and a deflector board 9. The microstrip feeder line 6, the U shaped explorer 7 and the wide slot 4 are photoetched on both faces of the medium base plate 2 to form the microstrip structure. One end of the microstrip feeder line 6 is connected with the coaxial feeder line 8 and the other end is connected with the U shaped explorer. The upper part of the slot 4 is fixed with the square parasitic conductor board 3 used for stretching the resistant band and enhancing gain through a medium supporting bar 2. The lower part of the microstrip feeder line 6 is fixed with the U shaped deflector plate 9 used for generating the unidirectional radiation and increasing aerial gain through a medium supporting bar 10. The utility model has the advantages of simple structure, simple preparing process, low price and good compatibility. The voltage standing wave ratio VSWR is less than 1. 35 within the range of 24% broad band. The gain can reach as high as 8. 5 dBi. The directional diagram front-to-back ratio is more than 19dB. The utility model can be used as a base station antenna unit of multi-business mobile communication.

Description

The wide seam antenna element of wide-band printing

Technical field

The utility model relates to antenna technical field, the wide seam antenna element of specifically a kind of wide-band printing.Form antenna array with this antenna element, the antenna for base station that can be used as in the mobile communication uses.

Background technology

Antenna for base station is an important component part in the mobile communication, and present antenna for base station is operated in a traffic frequencies scope mostly, only is used for the GSM frequency range as the GSM antenna for base station, and the cdma base station antenna only is used for the CDMA frequency range.If the public one pair of antenna of wireless traffics such as GSM, CDMA, SCDMA, 3G energy makes a kind of antenna can be operated in the different scopes of business, then can improve the utilance of base station greatly, therefore, necessarily require antenna for base station will use all channel antenna.Traditional all channel antenna often adopts microstrip antenna, printing vibrator and the printed slot etc. of band parasitic element.The impedance bandwidth major part of these antenna is to be reference with standing wave ratio of input voltage VSWR less than 1.5, comes as antenna for base station if organize battle array as element antenna, and such voltage standing wave ratio VSWR obviously can not meet the demands.Must consider when littler voltage standing wave ratio VSWR that the impedance bandwidth of antenna just more is of practical significance.IEEE Transactions on Antenna and Propagation magazine is at interim report of calendar year 2001 the 7th, adopt a kind of antenna of the wide crack structure of printing, voltage standing wave ratio VSWR is less than 1.5 in the frequency band of 1821MHz～2912MHz, relative bandwidth reaches 42%, is the wideest a kind of antenna of present impedance frequency band.If but with the voltage standing wave ratio VSWR of this antenna being reference less than 1.35, its relative bandwidth can be reduced to 17%, obviously, can not satisfy current frequency in business such as GSM, CDMA, 3G, SCDMA is in 1710MHz～2170MHz scope, and relative bandwidth will reach 24% requirement.

The content of utility model

It is reference with voltage standing wave ratio VSWR less than 1.35 that the purpose of this utility model provides a kind of, and impedance bandwidth can reach 24% the wide seam antenna element of wide-band printing, further the frequency band of broadening antenna.

The technical scheme that realizes the utility model purpose is:

Structure by changing existing wide seam antenna is with the frequency band of broadening antenna, and its key is to have increased parasitic conductor plate and reflecting plate.The entire antenna unit mainly is made up of dielectric substrate, microstrip feed line, U-shaped probe, slit, coaxial feeder, parasitic conductor plate and reflecting plate.Wherein, the photoetching formation on dielectric substrate respectively of microstrip feed line and U-shaped probe and slit, an end of microstrip feed line links to each other with coaxial feeder, and the other end is connected with the U-shaped probe.The top in slit is fixed with parasitic conductor plate by the dielectric support bar, and the below of microstrip feed line is fixed with reflecting plate by the dielectric support bar.

Described parasitic conductor plate is square, in order to broadening impedance frequency band and raising gain; The reflecting plate cross section is a U-shaped, in order to produce one-way radiation, the gain that increases antenna.

The utility model improves the obvious broadening of impedance frequency band of antenna and gain owing to be provided with parasitic conductor plate and reflecting plate on the wide slot antenna structure of existing printing.Actual measurement shows that with the broad-band antenna that the utility model is made, standing wave ratio of input voltage is less than 1.35 in the wireless communication frequency band scope of 1710MHz～2170MHz, and relative bandwidth reaches 24%, and gain reaches 8.5dB, and ratio is greater than 19dB before and after the directional diagram; In addition, the utlity model has simple in structure, handling ease, cheap, the advantage of high conformity can be used as the base station antenna unit in the multi-service mobile communication.

Description of drawings

Fig. 1 is a structure side view of the present utility model

Fig. 2 is a structure front view of the present utility model

Fig. 3 is the connection diagram of microstrip feed line of the present utility model and U-shaped probe

Fig. 4 is a voltage standing wave ratio VSWR frequency characteristics of the present utility model

Fig. 5 is an elevation radiation patytern of the present utility model

Fig. 6 is a horizontal radiation pattern of the present utility model

With reference to Fig. 1, Fig. 2 and Fig. 3, the wide seam antenna element 1 of wide-band printing of the present utility model mainly is made up of upper and lower

medium support bar

2 and 10, parasitic conductor plate 3, slit 4, dielectric substrate 5, microstrip feed line 6, U-shaped probe 7, coaxial feeder 8 and reflecting plate 9.The photoetching microstrip structure is adopted in microstrip feed line 6, U-shaped probe 7 and slit 4, and this U-shaped probe encourages the slit.Dielectric substrate 5 adopts two-sided deposited copper dielectric-slab, one side photoetching microstrip feed line 6 and U-shaped probe 7, another side photoetching slit 4.One end of microstrip feed line 6 links to each other with coaxial feeder 8, and the other end is connected with U-shaped probe 7.Slit 4 and parasitic conductor plate 3 are square, and parasitic conductor plate 3 is fixed on the top in slit 4 by a dielectric support bar 2.Reflecting plate 9 is a U-shaped, is fixed on the below of microstrip feed line 6 by four dielectric support bars 10.

In order to obtain best electric property, can regulate the length of side of parasitic conductor plate 3, the length and width of reflecting plate 9, the height of both sides perk, the thickness of dielectric substrate 5, the length of side in slit by experiment; The length L 1 and spacing L2 of microstrip feed line apart from the height of reflecting plate, parasitic conductor plate 3 apart from the height and the U-shaped probe of reflecting plate 9.Wherein:

The length of side in slit 4 is adjustable in 0.32 λ～0.34 λ; The length of side of parasitic conductor plate 3 is less than the length of side in slit 4, and adjustable in 0.28 λ～0.32 λ; Parasitic conductor plate 3 is adjustable in 0.36 λ～0.40 λ apart from the height of reflecting plate 9; The length of side of dielectric substrate 5 is adjustable in 0.68 λ～0.72 λ, and reflecting plate 9 is adjustable in 0.24 λ～0.26 λ apart from the height of microstrip feed line 6; The ratio of reflecting plate length and width is adjustable in 1.5～1.8, and the ratio of the height of reflecting plate length and both sides perk is adjustable in 6～12; The ratio of the width wf of U-shaped probe and the length L 1 of U-shaped probe is adjustable in 0.15～0.2, and U-shaped probe length L1 is adjustable in 0.4～0.5 with the ratio of the spacing L2 of U-shaped probe, and U-shaped probe length L1 is adjustable in 2～6 with the ratio of the length L 3 of microstrip feed line.

Dielectric support bar

2,10 adopts thin epoxy cylinder, and parasitic conductor plate 3 and reflecting plate 9 adopt metal material.Coaxial feeder adopts 50 ohm of hard cables of standard, and its outer conductor is connected with reflecting plate.

With reference to Fig. 4～Fig. 6, the utility model is in 1710～2170MHz frequency range of high band and the 3G of GSM, CDMA, and according to the broad-band antenna of the structure fabrication of Fig. 1～shown in Figure 3, through the reality test, the electrical performance indexes of antenna is good.

The voltage standing wave ratio VSWR frequency characteristics that provides by Fig. 4 as seen, relative bandwidth is 24% in the frequency range of 1710～2170MHz, voltage standing wave ratio VSWR＜1.35.

The elevation radiation patytern that provides by Fig. 5 as seen, half-power beam width is HPBWE=45 °.

The horizontal radiation pattern that provides by Fig. 6 as seen, HPBWH=65.3 ° of half-power beam width is.

In the frequency range of 1710～2170MHz, the actual measurement gain is 8.5dBi.

Claims

1. wide seam antenna element of wide-band printing, comprise dielectric support bar (2,10), slit (4), dielectric substrate (5), microstrip feed line (6), U-shaped probe (7), coaxial feeder (8), this microstrip feed line and U-shaped probe and slit form in the photoetching of the two sides of dielectric substrate (5) respectively, one end of microstrip feed line (6) links to each other with coaxial feeder (8), and the other end is connected with U-shaped probe (7); The top that it is characterized in that slit (4) is fixed with parasitic conductor plate (3) by dielectric support bar (2), and the below of microstrip feed line (6) is fixed with reflecting plate (9) by dielectric support bar (10).

2. the wide seam antenna element of wide-band printing according to claim 1, its feature is square being shaped as of parasitic conductor plate, and the length of side is adjustable in 0.28 λ～0.32 λ.

3. the wide seam antenna element of wide-band printing according to claim 1 is characterized in that the U-shaped that is shaped as of reflecting plate (9), and the ratio of length and width is adjustable in 1.5～1.8, and the ratio of the height of reflecting plate length and both sides perk is adjustable in 6～12.

4. the wide seam antenna element of wide-band printing according to claim 1, it is characterized in that parasitic conductor plate (3) is adjustable in 0.36 λ～0.40 λ apart from the height of reflecting plate (9), reflecting plate (9) is adjustable in 0.24 λ～0.26 λ apart from the height of microstrip feed line (6).