CN101882709B - Butterfly-based asymmetric ultra-wideband antenna - Google Patents
Butterfly-based asymmetric ultra-wideband antenna Download PDFInfo
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- CN101882709B CN101882709B CN 201010153500 CN201010153500A CN101882709B CN 101882709 B CN101882709 B CN 101882709B CN 201010153500 CN201010153500 CN 201010153500 CN 201010153500 A CN201010153500 A CN 201010153500A CN 101882709 B CN101882709 B CN 101882709B
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Abstract
The invention provides a butterfly-based asymmetric ultra-wideband antenna which comprises a radiation unit and a feeder line unit, wherein the radiation unit is formed by a dielectric substrate with a metal coating covered and takes the shape of a butterfly; one wing of the radiation unit is connected with a grounding end of the feeder line unit through a first metal sheet, and the other wing of the radiation unit is connected with a signal line of the feeder line unit through a second metal sheet; the feeder line is formed by a coaxial line; the two wings of the radiation unit are respectively in an asymmetric structure; and gaps are etched on the two wings of the radiation unit. The invention realizes the aim of broadening the bandwidth of the ultra-wideband antenna.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of asymmetric ultra-wideband antenna based on butterfly.
Background technology
The ultra broadband short-distance wireless communication has been subject to the global communication technical field and has paid attention to greatly.Ultra-broadband signal, be requirement Arbitrary Relative bandwidth exceed 20% or absolute bandwidth greater than the signal of 0.5GHz (FCC definition).Ultra-broadband signal is the signal that satisfies FCC power spectral density requirement for restriction, and transmission rate can surpass 100Mbit/s, and commercial working frequency range is 3.1GHz～10.6GHz.Ultra-broadband signal communication is compared with common carrier communication or spread spectrum communication, super broad band radio communication system also has high security except having high traffic rate and super wide communication bandwidth, power consumption is low, the characteristics such as the anti-multipath fading ability is strong, and multiple access and penetration capacity are strong.Therefore, super-broadband tech has broad application prospects in radar tracking, radio communication, the fields such as barrier imaging, weapon control system, range finding, accurate location that penetrate.
The research of ultra broadband (Ultra Wide Band is called for short UWB) antenna is a pith in the ultra-wideband communications.The modulation-transmission technology of UWB pulse communication and traditional radio communication has basic difference.UWB antenna bandwidth at first, transmission rate is high; Secondly the UWB antenna power is low, and power consumption is little; Again regularly accurate positioning of UWB antenna, ability of anti-multipath is strong.
It is the high band occasion that existing most of UWB antenna all is applied to, and the UWB antenna ratio that is applicable to the special burst pulse of low-frequency range is less.Simultaneously, prior art changes corresponding impedance and realizes widening of the UWB beamwidth of antenna normally for certain resonance point.Also adopt to change the scheme that the mode of antenna structure realizes.
Summary of the invention
The invention provides a kind of asymmetric ultra-wideband antenna based on butterfly, realized expanding the purpose of the beamwidth of antenna.
The invention provides a kind of asymmetric ultra-wideband antenna based on butterfly, it is characterized in that, comprising: by the radiating element that the dielectric substrate that is coated with the coat of metal consists of, described radiating element is butterfly; One wing of described radiating element is connected with the earth terminal of feeder unit by the first sheet metal; Another wing of described radiating element is connected with the holding wire of described feeder unit by the second sheet metal; Described feeder unit is made of coaxial line;
The both wings of described radiating element are respectively dissymmetrical structure, are etched with the slit on the both wings of described radiating element.
On the such scheme basis, also comprise: be etched with respectively the not identical slit of number on the both wings of described radiating element.
On the such scheme basis, also comprise: described slit is non-uniform Distribution at the both wings of described radiating element respectively.
On the such scheme basis, also comprise: described slit is rectangular.
On the such scheme basis, also comprise: described slit is non-closed slit.
On the such scheme basis, also comprise: the stepped rectangle in described slit.
On the such scheme basis, also comprise: the bandwidth of described asymmetric ultra-wideband antenna based on butterfly is 0.26GHz～0.43GHz.
On the such scheme basis, also comprise: described asymmetric ultra-wideband antenna based on butterfly is used for the emission burst pulse, described pulse-three dB bandwidth is 320MHz～475MHz.
Present embodiment so that the impedance of radiating element both wings is asymmetric, thereby produces two different resonance points based on the asymmetric ultra-wideband antenna of the butterfly difference by the radiating element both wings.Adjust the difference of radiating element the right and left and the position in adjustment radiating element slit, can adjust the position of resonance point, thus so that the bandwidth of the mutually close widen antenna in the position of two resonance points.
Description of drawings
Fig. 1 is the vertical view that the present invention is based on the asymmetric ultra-wideband antenna embodiment one of butterfly;
Fig. 2 is radiating element and the feeder unit junction vertical view that the present invention is based on the asymmetric ultra-wideband antenna embodiment one of butterfly;
The comparison diagram of Fig. 3 the present invention is based on the standing-wave ratio curve of asymmetric ultra-wideband antenna embodiment one of butterfly and existing symmetrical structure super standing-wave ratio curve with Wide antenna;
Fig. 4 is the vertical view that the present invention is based on the asymmetric ultra-wideband antenna embodiment two of butterfly;
Fig. 5 is the standing-wave ratio curve chart that the present invention is based on the asymmetric ultra-wideband antenna embodiment three of butterfly;
Fig. 6 is the standing-wave ratio resolution chart that the present invention is based on the asymmetric ultra-wideband antenna embodiment four of butterfly.
Embodiment
Further specify technical scheme of the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 is the vertical view that the present invention is based on the asymmetric ultra-wideband antenna embodiment one of butterfly, and Fig. 2 is radiating element and the feeder unit junction vertical view that the present invention is based on the asymmetric ultra-wideband antenna embodiment one of butterfly.As shown in Figure 1, present embodiment comprises based on the asymmetric ultra-wideband antenna of butterfly: radiating element 1 and feeder unit.
Radiating element is made of the dielectric substrate that is coated with the coat of metal, and feeder unit is made of coaxial line.The screen of coaxial line is the earth terminal of feeder unit, and the copper core of coaxial line is the holding wire of feeder unit.Radiating element one wing is connected with the earth terminal (screen) of coaxial line by the first sheet metal; Another wing of radiating element is connected with holding wire by the second sheet metal, forms distributing point.Particularly, circular hole 3 shown in Figure 2 is the SMA interface, and coaxial line links to each other with radiating element 1 by the SMA interface.
Asymmetric ultra-wideband antenna based on butterfly is launched input signal (voltage difference) by radiating element 1 to the external world, and receives the electromagnetic field signal that comes from the outside by radiating element 1.
As shown in Figure 1, radiating element is butterfly, and the both wings of this butterfly are respectively dissymmetrical structure and both wings are etched with slit 2.As a kind of realization speech formula, the wing 11 shown in Fig. 1, the length in its left side is greater than the length on right side, and the length in another wing 12 left sides is less than the length on right side.In addition, slit 2 can become difformity.Slit shown in Fig. 1 is non-closed rectangular.From the slit of centre, be etched with at a certain distance the slit of certain width.
Because the both wings of radiating element are unsymmetric structure, the CURRENT DISTRIBUTION of two wing surfaces of radiating element is not identical, then the input impedance of radiating element both wings is not identical, and then has changed the resonance frequency of antenna, causes antenna to produce two corresponding resonance points in frequency range.Antenna with two resonance points, its bandwidth comprise the respectively bandwidth range of correspondence of two resonance points.Therefore, has the bandwidth range of the antenna of two resonance points, relative bandwidth range greater than the antenna that only has a resonance point.
Difference that can be by adjusting the radiating element both wings, for example, the position in slit, the width in slit, in number and the slit distribution situation on both wings in slit on the both wings, adjust two resonance point positions, make two resonance points mutually close, thus when satisfy staying than ripple so that the effective bandwidth of antenna increase.If the position apart from each other of two resonance points, a part of frequency range does not satisfy the signal mission need because of standing-wave ratio in the middle of can making, and signal can't be launched.Therefore, need to change two resonance points, the effective bandwidth of antenna is widened.
The comparison diagram of Fig. 3 the present invention is based on the standing-wave ratio curve of asymmetric ultra-wideband antenna embodiment one of butterfly and existing symmetrical structure super standing-wave ratio curve with Wide antenna.As shown in Figure 3, the super band Wide antenna of existing symmetrical structure only has a resonance point 280MHz, and corresponding standing-wave ratio curve is curve 4, and respective bandwidth is 0.24GHz～0.34GHz.And the standing-wave ratio curve 1 of unsymmetric structure antenna provided by the invention, 2 and 3, two resonance points are arranged respectively, although standing- wave ratio curve 1,2 and 3 second resonance point separately do not satisfy the standing-wave ratio requirement of signal emission, but can be by adjusting the difference of radiating element both wings, make two resonance points mutually close, and then the standing-wave ratio that makes second resonance point place satisfies the signal launch requirements, thereby the frequency range of second resonance point is the effective bandwidth of antenna, reaches the purpose of widening the beamwidth of antenna.
In addition, the asymmetric ultra-wideband antenna that the present invention is based on butterfly is used for the emission burst pulse, pulse-three dB bandwidth is 320MHz～475MHz.
Present embodiment so that the impedance of radiating element both wings is asymmetric, thereby produces two different resonance points based on the asymmetric ultra-wideband antenna of the butterfly difference by the radiating element both wings.Adjust the difference of radiating element the right and left and the position in adjustment radiating element slit, can adjust the position of resonance point, thus so that the bandwidth of the mutually close widen antenna in the position of two resonance points.
Fig. 4 is the vertical view that the present invention is based on the asymmetric ultra-wideband antenna embodiment two of butterfly, shown in Figure 4 based on butterfly asymmetric ultra-wideband antenna and the main distinction of the asymmetric ultra-wideband antenna based on butterfly shown in Figure 1 be, gap position on the radiating element both wings changes, the slit is stepped, and the slit is non-uniform Distribution at the both wings of radiating element.
The sheet metal that connects radiating element and feeder unit is positioned at the front of the dielectric substrate of radiating element, and dielectric substrate is the low-k material.Described radiating element one wing is connected with the earth terminal (screen) of coaxial line by the first sheet metal; Described holding wire is connected with another wing of described radiating element by the second sheet metal, forms the feeder line point.
As shown in Figure 4, radiating element is asymmetric butterfly, is etched with at a certain distance the stepped rectangular aperture 4 of different in width on the radiating element both wings, the slit non-uniform Distribution on radiating element 1 both wings.The change of seam shape and position can affect the position of resonance point.
The both wings of radiating element are different by shape and the position in slit, make both wings be asymmetrical shape, thereby the CURRENT DISTRIBUTION of two wing surfaces of radiating element is not identical, causes the input impedance of radiating element both wings not identical, thereby produces two corresponding resonance points in frequency range.By changing the distance of two resonance points, the bandwidth of antenna is changed, change antenna in the standing-wave ratio of different frequency range, thereby reach the effect that changes antenna performance.Owing to have the antenna of two resonance points, its bandwidth comprises the respectively bandwidth range of correspondence of two resonance points.Therefore, has the bandwidth range of the antenna of two resonance points, relative bandwidth range greater than the antenna that only has a resonance point.
The relative bandwidth that the present invention is based on the asymmetric ultra-wideband antenna of butterfly has reached 49.3%, satisfy the ultra broadband characteristic, simple in structure, flexible design, the difference of the radiating element butterfly both wings by adjusting antenna and the width in slit, capable of regulating resonance point and then change bandwidth.Simultaneously, diminishing on existing basis based on the size of the asymmetric ultra-wideband antenna of butterfly just can have in higher frequency range larger bandwidth, can satisfy the use of some special occasions, ultra-wideband antenna is changed in miniaturization, easily and available circuit integrated, making it to become has more practicality.
Fig. 5 is the standing-wave ratio curve chart that the present invention is based on the asymmetric ultra-wideband antenna embodiment three of butterfly.Referring to shown in Figure 1, at a wing of radiating element, the length of the non-closed rectangular of its left and right sides is not identical, causes radiating element to be unsymmetric structure.On the both wings of present embodiment for radiating element, the difference of the length difference of non-closed rectangular illustrates the bandwidth situation of change of the asymmetric ultra-wideband antenna that the present invention is based on butterfly.
As shown in Figure 5, when curve 1 is 60mm for the length difference of non-closed rectangular, based on the standing-wave ratio change curve of the asymmetric ultra-wideband antenna of butterfly.In such cases, the position of resonance point 1 is 282MHz, and the effective bandwidth of resonance point 1 correspondence is 0.26GHZ～0.33GHZ; The position of resonance point 2 is 465MHz, and the effective bandwidth of resonance point 2 correspondences is 0.43GHZ～0.49GHZ.Correspondingly the bandwidth excursion based on the asymmetric ultra-wideband antenna of butterfly is 0.26GHZ～0.33GHZ and 0.43GHZ～0.49GHZ.
As shown in Figure 5, when curve 2 is 50mm for the length difference of non-closed rectangular, based on the standing-wave ratio change curve of the asymmetric ultra-wideband antenna of butterfly.In such cases, the position of resonance point 1 is 285MHz, and the effective bandwidth of resonance point 1 correspondence is 0.26GHZ～0.34GHZ; The position of resonance point 2 is 432MHz, and the effective bandwidth of resonance point 2 correspondences is 0.40GHZ～0.46GHZ.Correspondingly the bandwidth excursion based on the asymmetric ultra-wideband antenna of butterfly is 0.26GHZ～0.34GHZ and 0.40GHZ～0.46GHZ.
As shown in Figure 5, when curve 3 is 40mm for the length difference of non-closed rectangular, based on the standing-wave ratio change curve of the asymmetric ultra-wideband antenna of butterfly.In such cases, the position of resonance point 1 is 291MHz, and the position of resonance point 2 is 385MHz, and correspondingly the continuous bandwidth scope based on the asymmetric ultra-wideband antenna of butterfly is 0.26GHZ～0.41GHZ.
As shown in Figure 5, it is poor to adjust the rectangle length of extending radiating element one wing left and right sides, the distance of removable two resonance points.Along with reducing of length difference, distance diminishes gradually between two resonance points, thereby increases the effective bandwidth scope of antenna.As shown in Figure 5, standing-wave ratio is less than 2 o'clock frequency, is the bandwidth range of the asymmetric ultra-wideband antenna that the present invention is based on butterfly.The too high antenna that means of standing-wave ratio is serious to signal reflex, and launching effect is bad, and efficient is low.Minimum in resonance point place standing-wave ratio, one of meeting generation is recessed in the standing-wave ratio resolution chart.
As shown in Figure 5, more smooth than curve at the bandwidth standing internal wave, for transmitting, still inevitable some frequency can be filtered although it is so, but signal can be launched away in most of frequency range.And article one curve and antenna corresponding to second curve difference, the centre has a big chunk frequency signal can't be launched because standing-wave ratio is excessive.In this case, the bandwidth range of antenna reality just is not the bandwidth after two bandwidth ranges corresponding to resonance point superpose, and effectively bandwidth range probably only has one, i.e. bandwidth range corresponding to a certain resonance point.Yet, with respect to front two kinds of antennas, the 3rd curve respective antenna, the standing-wave ratio between two resonance points satisfies mission need, therefore two bandwidth ranges that these two resonance points are corresponding are all effective, and the actual bandwidth of the 3rd curve respective antenna has significantly and widens.
Present embodiment makes the both wings of butterfly ultra-wideband antenna be unsymmetric structure, thereby has reached the purpose of the bandwidth of widening antenna by changing the length difference in non-closed rectangular slit.Therefore, the asymmetric ultra-wideband antenna simplicity of design that the present invention is based on butterfly is flexible, is easy to realize.
Fig. 6 is the standing-wave ratio resolution chart that the present invention is based on the asymmetric ultra-wideband antenna embodiment four of butterfly.Present embodiment illustrates the performance of the asymmetric ultra-wideband antenna that the present invention is based on butterfly for the width change in slit between the non-closed rectangular.
As shown in Figure 6, when curve 1 is 12mm for width between the slit, standing-wave ratio change curve based on the asymmetric ultra-wideband antenna of butterfly, the position of resonance point 1 is 290MHz, the position of resonance point 2 is 370MHz, and correspondingly the continuous bandwidth scope based on the asymmetric ultra-wideband antenna of butterfly is 0.26GHZ～0.39GHZ.
As shown in Figure 6, when curve 2 was 15mm for width between the slit, the position of resonance point 1 was 300MHz, and the position of resonance point 2 is 390MHz, and correspondingly the continuous bandwidth scope based on the asymmetric ultra-wideband antenna of butterfly is 0.26GHZ～0.41GHZ.
Present embodiment makes the both wings of butterfly ultra-wideband antenna be unsymmetric structure, thereby has reached the purpose of the bandwidth of widening antenna by changing the width in slit.Therefore, the asymmetric ultra-wideband antenna simplicity of design that the present invention is based on butterfly is flexible, is easy to realize.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (7)
1. the asymmetric ultra-wideband antenna based on butterfly is characterized in that, comprising: by the radiating element that the dielectric substrate that is coated with the coat of metal consists of, described radiating element is butterfly; One wing of described radiating element is connected with the earth terminal of feeder unit by the first sheet metal; Another wing of described radiating element is connected with the holding wire of described feeder unit by the second sheet metal; Described feeder unit is made of coaxial line;
The both wings of described radiating element are respectively dissymmetrical structure, are etched with the slit on the both wings of described radiating element.
2. described asymmetric ultra-wideband antenna based on butterfly according to claim 1 is characterized in that, comprising: be etched with respectively the not identical slit of number on the both wings of described radiating element.
3. described asymmetric ultra-wideband antenna based on butterfly according to claim 2 is characterized in that comprise: described slit is non-uniform Distribution at the both wings of described radiating element respectively.
4. described asymmetric ultra-wideband antenna based on butterfly according to claim 3 is characterized in that comprise: described slit is rectangular.
5. described asymmetric ultra-wideband antenna based on butterfly according to claim 3 is characterized in that comprise: described slit is non-closed slit.
6. described asymmetric ultra-wideband antenna based on butterfly according to claim 3 is characterized in that, comprising: the stepped rectangle in described slit.
7. described asymmetric ultra-wideband antenna based on butterfly according to claim 1 is characterized in that, comprising:
The bandwidth of described asymmetric ultra-wideband antenna based on butterfly is 0.26GHZ～0.43GHz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010153500 CN101882709B (en) | 2010-04-19 | 2010-04-19 | Butterfly-based asymmetric ultra-wideband antenna |
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| CN 201010153500 CN101882709B (en) | 2010-04-19 | 2010-04-19 | Butterfly-based asymmetric ultra-wideband antenna |
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| CN101882709B true CN101882709B (en) | 2013-04-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102811325A (en) * | 2011-06-30 | 2012-12-05 | 深圳光启高等理工研究院 | On-vehicle China multimedia broadcasting (CMMB) terminal |
| CN102437409B (en) * | 2011-09-15 | 2013-12-11 | 武汉虹信通信技术有限责任公司 | Ultra broadband dipole radiation unit |
| US10608341B2 (en) * | 2018-03-09 | 2020-03-31 | GM Global Technology Operations LLC | Wideband asymmetric slot antenna |
| CN112467351B (en) * | 2020-11-19 | 2022-04-19 | 中国电子科技集团公司第二十九研究所 | Multi-resonance excitation back cavity antenna |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101257147A (en) * | 2008-03-20 | 2008-09-03 | 上海交通大学 | Butterfly-shaped air microstrip aerial |
| CN201117796Y (en) * | 2006-11-30 | 2008-09-17 | 上海坤锐电子科技有限公司 | Butterfly shaped balanced antenna |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201117796Y (en) * | 2006-11-30 | 2008-09-17 | 上海坤锐电子科技有限公司 | Butterfly shaped balanced antenna |
| CN101257147A (en) * | 2008-03-20 | 2008-09-03 | 上海交通大学 | Butterfly-shaped air microstrip aerial |
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