CN104282992B - A fractal ultra wide band antenna - Google Patents
A fractal ultra wide band antenna Download PDFInfo
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- CN104282992B CN104282992B CN201410586712.6A CN201410586712A CN104282992B CN 104282992 B CN104282992 B CN 104282992B CN 201410586712 A CN201410586712 A CN 201410586712A CN 104282992 B CN104282992 B CN 104282992B
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Abstract
A fractal ultra wide band antenna, belongs to wireless communication technology field.The fractal ultra wide band antenna of the present invention, by dielectric-slab (3), is printed in dielectric-slab (3) one side and the radiating element 2 of direct connection and feed element 4, and the ground unit (6) being printed on dielectric-slab another side is constituted；Wherein：A. radiating element (2) be formed through twice or twice above iterative fractal and the metal patch for connected component, be etched with gap (1) thereon；B. ground unit (6) is trapezoidal metal patch, and the center of feather edge is etched with a rectangular slot (5) thereon.It is an advantage of the current invention that：1st, there is ultra broadband, multiple-frequency operation, good directionality, standing-wave ratio little, and the advantage achieving good impedance match.2nd, structure is simple, compact dimensions, lightweight, loss are low, meets the requirement of planar design；3rd, low manufacture cost, high precision, favorable repeatability, is suitable for compact apparatus and uses, and is easy to produce in batches.
Description
Technical field：
The present invention relates to a fractal ultra wide band antenna, belong to wireless communication technology field.
Background technology：
Ultra broadband (Ultra-wideband, UWB) technology be a kind of new short distance two-forty receiving much concern at present no
Line communication technology.2002, Federal Communications Committee (FCC) has issued the super wideband wireless that a bandwidth criteria is 7.5GHz led to
Letter frequency range, the frequency range of covering is 3.1GHz-10.6GHz, and in terms of industry and science, Ultra-Wide Band Radio has been thrown
Enter substantial amounts of research work.Compared with the wireless communication technology that other are traditional, the technical characterstic of UWB mainly has transfer rate
High, communication distance is short, average emitted power is low, good concealment, is difficult to be trapped, confidentiality is high, multi-path resolved rate is high, suitable
In pocket application etc..Traditional UWB technology uses base band transmission, need not carry out rf modulations and demodulation so that UWB equipment work(
Consume little, low cost, motility is high, is suitable for pocket wireless application.
Antenna applications fractal technology is a kind of more effectively expansion bandwidth and subtracts undersized method, is also that one kind is effectively realized
The method of ultra broadband.Because fractal structure has the characteristic of self similarity, fractal antenna shows the characteristic of multifrequency, is divided by adjusting
Parameter in shape structure, each resonance point of multifrequency is mutually furthered, and then realizes the broadband character of antenna.Secondly as point
Shape structure has space filling properties so that microstrip antenna has the characteristic of miniaturization.Fractal structure extending bandwidth comes from and is formed
The space filling and self-similarity of fractal graph.After undue shape, figure can comprise some tiny structures, and these structures are produced
Give birth to continuous resonance, define wider frequency band.Increase iterationses, and then reach the requirement of ultra broadband.Therefore, divide shape sky
Line technology has been greatly facilitated development and the application of ultra-wideband antenna technology.
The ultra-wideband antenna based on fractal structure of the present invention, by literature search, has no open with identical of the present invention and reports
Road.
Content of the invention：
It is an object of the invention to overcoming the deficiency of prior art, and provide a fractal ultra wide band antenna.
The fractal ultra wide band antenna of the present invention, by dielectric-slab (3), is printed on upper and directly connection the radiation of dielectric-slab one side
Unit (2) and feed element (4), and it is printed on ground unit (6) composition on dielectric-slab another side, wherein：
A. radiating element (2) be formed through twice or twice above iterative fractal and the metal patch for connected component,
It is etched with gap (1) thereon；
B. ground unit (6) is trapezoidal metal patch, and the center of feather edge is etched with a rectangular slot thereon
(5).
The fractal method of described radiating element 2 is：
A. by radius, the circle for R is divided into the sector that six angles are 60 °, to each sector one radius of excision is first
R/2, angle is 60 ° of little sector, then carries out figure expansion respectively to remaining six identical structures, and expansion part is with half
Footpath is that 60 ° of fan-shaped strings of R are formed with remainder encirclement for the semi arch of diameter, thus defining first time iteration；
B. trisection is carried out respectively to six semi-circular structure in the structure after first time iteration, according to first time iteration
Mode is excised and is expanded, and cut-out is radius is R/4, and angle is 60 ° of sector, and expansion part is with radius as R/2
60 ° of fan-shaped strings be that the semi arch and remainder encirclement of diameter forms, thus defining second iteration.
By that analogy, the antenna of three times and above iterationses can be obtained.The present invention is increased by increasing iterationses
The resonant frequency point of antenna, and increased bandwidth.
The radiating element 2 being formed through second iteration, as shown in Figure 1.
The present invention compared with prior art, has the advantage that：
1st, there is ultra broadband, multiple-frequency operation, good directionality, standing-wave ratio little, and the advantage achieving good impedance match.
2nd, structure is simple, compact dimensions, lightweight, loss are low, meets the requirement of planar design.
3rd, low manufacture cost, high precision, favorable repeatability, is suitable for compact apparatus and uses, and is easy to produce in batches.
Brief description：
Fig. 1 is the front view structural representation of the present invention.
Fig. 2 is the rearview structural representation of the present invention.
Fig. 3 is the emulation of antenna return loss and test result in the present invention.
Fig. 4-a and Fig. 4-b is respectively E face and the emulation of H face and the antenna pattern measuring in 2.5GHz.
Fig. 5-a and Fig. 5-b is respectively E face and the emulation of H face and the antenna pattern measuring in 6.5GHz.
Fig. 6-a and Fig. 6-b is respectively E face and the emulation of H face and the antenna pattern measuring in 9.75GHz.
Specific embodiment：
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is further described.
A fractal ultra wide band antenna of the present invention, by dielectric-slab 3, is printed on upper and directly connection the spoke of dielectric-slab one side
Penetrate unit 2 and feed element 4, and the ground unit 6 being printed on dielectric-slab another side is constituted, wherein：
A. radiating element 2 be formed through twice or twice above iterative fractal and the metal patch for connected component, its
Upper etching gap 1；
B. ground unit 6 is trapezoidal metal patch, and the center of feather edge is etched with a rectangular slot 5 thereon.
The fractal method of described radiating element 2 is：
A. by radius, the circle for R is divided into the sector that six angles are 60 °, to each sector one radius of excision is first
R/2, angle is 60 ° of little sector, then carries out figure expansion respectively to remaining six identical structures, and expansion part is with half
Footpath is that 60 ° of fan-shaped strings of R are formed with remainder encirclement for the semi arch of diameter, thus defining first time iteration；
B. trisection is carried out respectively to six semi-circular structure in the structure after first time iteration, according to first time iteration
Mode is excised and is expanded, and cut-out is radius is R/4, and angle is 60 ° of sector, and expansion part is with radius as R/2
60 ° of fan-shaped strings be that the semi arch and remainder encirclement of diameter forms, thus defining second iteration.
By that analogy, the antenna of three times and above iterationses can be obtained.The present invention is increased by increasing iterationses
The resonant frequency point of antenna, and increased bandwidth.Here only provide the embodiment through second iteration.
The radiating element 2 being formed through iteration twice, as shown in Figure 1.
This antenna uses FR-4 dielectric-slab, and its relative dielectric constant is 4.4, and dielectric loss angle tangent is 0.02, using gradually
The microstrip line of degeneration is fed, and the radius R of initial circular radiation piece is 10mm.The antenna size size of the present invention is
40mm*30mm*1.6mm.
The present invention, by increasing the resonant frequency point that iterationses increase the frequency band of antenna, is continuously increased bandwidth.
The present invention is fed using microstrip line.The return loss of emulation and test is as shown in figure 3, meeting return loss
Less than under conditions of -10dB, realize four resonant frequencies of 2.7GHz, 4.8GHz, 7.9GHz, 9.4GHz, working band is
2.2GHz-10.2GHz.Not only cover the 3.1GHz-10.2GHz in ultra wideband frequency, and also covers in TD-SCDMA
2300MHz-2400MHz frequency range, the 2130MHz-2135MHz frequency range in WCDMA, the 2300MHz-2400MHz in LTE and
2570MHz-2620MHz frequency range, the multiple communication work frequency range of WLAN (2400MHz-2485MHz, and 5150MHz-5825MHz),
And it is capable of good impedance matching.Additionally, the antenna of the present invention has the structure of compact, can easily be integrated into
In UWB equipment.
Claims (2)
1. a fractal ultra wide band antenna is it is characterised in that this fractal ultra wide band antenna, by dielectric-slab (3), is printed on dielectric-slab one
On the face and directly radiating element (2) of connection and feed element (4), and it is printed on the ground unit on dielectric-slab another side
(6) constitute, wherein：
A. radiating element (2) be formed through twice or twice above iterative fractal and the metal patch for connected component, thereon
Etching gap (1)；
B. ground unit (6) is trapezoidal metal patch, and the center of feather edge is etched with a rectangular slot (5) thereon；
C. the method for radiating element (2) iterative fractal is：The circle for R for the radius is divided into the sector that six angles are 60 °, right first
Each sector one radius of excision is R/2, and angle is 60 ° of little sector, then remaining six identical structures is entered respectively
Row figure expands, the part of expansion be 60 ° of fan-shaped strings with radius as R semi arch as diameter surround with remainder and
Become, thus defining first time iteration；Respectively trisection is carried out to six semi-circular structure in the structure after first time iteration, presses
Mode according to first time iteration is excised and is expanded, and the unit of excision is radius is R/4, and angle is 60 ° of sector, expansion
Part is that 60 ° of fan-shaped strings with radius as R/2 semi arch as diameter is formed with remainder encirclement, thus defining second
Secondary iteration.
2., it is characterised in that this antenna uses FR-4 dielectric-slab, it is with respect to dielectric for the fractal ultra wide band antenna described in claim 1
Constant is 4.4, and dielectric loss angle tangent is 0.02, and the radius R of initial circular radiation piece is 10mm；Antenna size is 40mm*
30mm*1.6mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410586712.6A CN104282992B (en) | 2014-07-04 | 2014-10-28 | A fractal ultra wide band antenna |
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| CN201410317242 | 2014-07-04 | ||
| CN2014103172423 | 2014-07-04 | ||
| CN201410317242.3 | 2014-07-04 | ||
| CN201410586712.6A CN104282992B (en) | 2014-07-04 | 2014-10-28 | A fractal ultra wide band antenna |
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| CN104282992A CN104282992A (en) | 2015-01-14 |
| CN104282992B true CN104282992B (en) | 2017-03-01 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048076A (en) * | 2015-05-11 | 2015-11-11 | 云南大学 | Novel fractal plane ultra-wideband antenna |
| CN105186117A (en) * | 2015-07-23 | 2015-12-23 | 厦门大学 | Multi-order alternately-nested recursive hollowed ring ultra-wideband antenna |
| CN107910637B (en) * | 2017-10-10 | 2020-04-07 | 云南大学 | Tooth-shaped miniaturized ultra-wideband antenna loaded with star-shaped gap |
| CN109687120B (en) * | 2018-11-23 | 2020-10-30 | 河南师范大学 | Omnidirectional double-ring small microstrip antenna |
| CN112993555B (en) * | 2019-12-13 | 2022-02-22 | 天津大学 | Sierpinski-like fractal ultra-wideband antenna and design method thereof |
| CN112821077B (en) * | 2020-12-31 | 2023-07-14 | 辽宁工程技术大学 | Double-notch fractal ultra-wideband antenna with reconfigurable characteristic |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004343424A (en) * | 2003-05-15 | 2004-12-02 | Seiko Epson Corp | Multiband antenna |
| CN101859925A (en) * | 2010-03-19 | 2010-10-13 | 华东交通大学 | Ultra-wideband monopole antenna with trap characteristics |
| CN102800958A (en) * | 2012-09-03 | 2012-11-28 | 云南大学 | Four-trap ultra-wideband antenna |
| CN103367892A (en) * | 2013-06-26 | 2013-10-23 | 云南大学 | Ultra wide band antenna based on fractal and fractal method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103094680A (en) * | 2013-01-20 | 2013-05-08 | 云南大学 | Five-notch ultra wide band antenna |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004343424A (en) * | 2003-05-15 | 2004-12-02 | Seiko Epson Corp | Multiband antenna |
| CN101859925A (en) * | 2010-03-19 | 2010-10-13 | 华东交通大学 | Ultra-wideband monopole antenna with trap characteristics |
| CN102800958A (en) * | 2012-09-03 | 2012-11-28 | 云南大学 | Four-trap ultra-wideband antenna |
| CN103367892A (en) * | 2013-06-26 | 2013-10-23 | 云南大学 | Ultra wide band antenna based on fractal and fractal method thereof |
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