CN106785463A - A kind of single trap ultra-wideband monopole antenna - Google Patents
A kind of single trap ultra-wideband monopole antenna Download PDFInfo
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- CN106785463A CN106785463A CN201710014062.1A CN201710014062A CN106785463A CN 106785463 A CN106785463 A CN 106785463A CN 201710014062 A CN201710014062 A CN 201710014062A CN 106785463 A CN106785463 A CN 106785463A
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- 230000005404 monopole Effects 0.000 title claims abstract description 47
- 230000005855 radiation Effects 0.000 claims abstract description 85
- 239000000758 substrate Substances 0.000 claims abstract description 64
- 230000008878 coupling Effects 0.000 claims description 48
- 238000010168 coupling process Methods 0.000 claims description 48
- 238000005859 coupling reaction Methods 0.000 claims description 48
- 238000005530 etching Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 238000010586 diagram Methods 0.000 abstract description 10
- 238000012545 processing Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000006866 deterioration Effects 0.000 abstract description 3
- 230000002452 interceptive effect Effects 0.000 abstract 1
- 238000013461 design Methods 0.000 description 8
- 238000004891 communication Methods 0.000 description 7
- 230000033228 biological regulation Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000747 cardiac effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005388 cross polarization Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
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Abstract
The invention discloses a kind of single trap ultra-wideband monopole antenna, including medium substrate, the lower surface of medium substrate is provided with earth plate, and the upper surface of medium substrate is provided with radiation patch and the microstrip feed line being connected with radiation patch, and band resistance resonant element is etched with microstrip feed line；Radiation patch bottom offers the open-work of transmitted radiation paster.Single trap ultra-wideband monopole antenna of the invention etches band resistance resonant element on microstrip feed line, trap characteristic is good, can effectively suppress interfering for radio ultra wide band system and wlan system, and the antenna radiation characteristics caused by avoiding by the way of etch fluting in radiation patch deterioration.The band hinders the simple structure of resonant element, compact compact, is easy to integrated, will not additionally increase the size of whole antenna, enables the antenna to realize miniaturization.The antenna has the advantages that small bandwidth, size, low cost, easy processing, there is good directional diagram in whole frequency band range.
Description
Technical field
The invention belongs to antenna technical field, and in particular to a kind of single trap ultra-wideband monopole antenna.
Background technology
Ultra wide band (UWB, Ultra-Wide Band) technology is a kind of new wireless communication technology, according to the United States Federal
The regulation of Federal Communications Commission (FCC, Federal Communications Commiss ion), UWB communication frequency range be
3.1GHz~10.6GHz.But, this bandwidth contains current wireless Local Area Network (WLAN) up to the frequency range of 7.5GHz
The working frequency of 5.2GHz (5.15GHz~5.35GHz) and 5.8GHz (5.725GHz~5.825GHz).In order to avoid these frequently
The interference of segment signal, it is necessary to ultra-wideband antenna produces blocking on the frequency band of 5GHz~6GHz scopes, i.e., with trap (band resistance)
Characteristic.In addition, current communication networks are increasingly intended to miniaturization and Highgrade integration, this is also carried to the Miniaturization Design of antenna
Requirement higher is gone out.
Plane single pole sub antenna due to its simple structure, and low is cutd open as an important kind in ultra-wideband antenna
The characteristics such as face, low cost, broadband, omnidirectional radiation, in short distance radio communication system, obtain a wide range of applications.
The current sub- ultra-wideband antenna of planar monopole realizes that the method for trap function mainly has two kinds：(1) antenna fluting or
Loading spurious element formation resonance structure, such as Chinese Patent Application No. disclose a kind of tool for the patent application of 201510218287.X
There is band to fall into the ultra-wideband monopole antenna of characteristic, the antenna etches H-shaped groove and cross bath in radiation patch, so that
Two frequency bands of 3.3GHz~3.7GHz and 3.7GHz~4.2GHz produce band to fall into characteristic.The method is by aerial radiation paster
Upper etching gap of different shapes, then adjusts the size in gap, is allowed to be equal to the centre frequency corresponding wavelength that needs suppress
A quarter or half, you can introduce band-stop response in corresponding centre frequency.The shortcoming of this design is in antenna spoke
Penetrating part fluting can cause the generation of higher mode so that antenna radiation pattern (antenna direction function graft is represented as day
The directional diagram of line) in high band distortion；The flow path of surface current is changed simultaneously, also increases the cross polarization of antenna so that
Directional diagram deteriorates；(2) bandreject filtering design is carried out on feeder line, such as Chinese Patent Application No. is 201410809770.0 patent
Application discloses a kind of Ultrawide-band trap antenna of new E BG structures, and the antenna is micro- using impedance matching input is symmetrically distributed in
Broken line type electro-magnetic bandgap (EBG, Electromagnetic Band-gap) structure with line both sides realizes band-stop response.This side
The advantage of method is that directly the band resistance structure for designing is embedded into microstrip line (feeder line), it is not necessary to which other structures are optimized
Can just realize that preferably band falls into performance；It is disadvantageous in that the EBG structures adds additional the size of antenna, is unfavorable for small-sized
Change, and the structure of complexity proposes requirement higher to processing and fabricating.
Therefore, it is necessary to provide a kind of with good trap characteristic and simple structure and be conducive to the list of Miniaturization Design
Trap ultra-wideband monopole antenna.
The content of the invention
The purpose of the present invention is directed to above-mentioned the deficiencies in the prior art, and provides a kind of single trap ultra-wideband monopole day
Line, disclosure satisfy that good trap characteristic, simple structure and is conducive to the requirement of Miniaturization Design.
In order to solve the above technical problems, one aspect of the present invention is：A kind of single trap ultra-wideband monopole
Antenna, including medium substrate, the lower surface of the medium substrate are provided with earth plate, and the upper surface of the medium substrate is provided with radiation
Paster and the microstrip feed line being connected with the radiation patch, the medium substrate are rectangle medium substrate, radiation patch covering
The top of the medium substrate, the microstrip feed line is connected and along the rectangle medium base with the center of the lower edge of the radiation patch
The long side direction of plate is extended downwardly, and band resistance resonant element is etched with the middle part of the microstrip feed line.
In another embodiment of list trap ultra-wideband monopole antenna of the invention, the radiation patch bottom offers and penetrates
The open-work of the radiation patch.
In another embodiment of list trap ultra-wideband monopole antenna of the invention, the radiation patch and open-work are respectively length
Oval radiation patch and oval open-work that axle extends along the broadside of rectangle medium substrate, and ellipse radiation patch
The center of piece is misaligned with the center of the oval open-work, the short axle of the short axle of the oval radiation patch and the oval open-work
It is conllinear and parallel with the side long of the rectangle medium substrate；The major axis of the oval radiation patch and the ratio of short axle and the ellipse
The major axis of shape open-work is identical with the ratio of short axle.
In another embodiment of list trap ultra-wideband monopole antenna of the invention, band resistance resonant element is worn including etching
The saturating microstrip feed line and the gap extended along the microstrip feed line length direction, prolong in the gap along the microstrip feed line length direction
Stretch and be provided with the first coupling line and the second coupling line parallel and be spaced with coupling, the upper end integrally connected of first coupling line
The top in the gap, the lower end of first coupling line is the free end of open circuit, the lower end integrally connected of second coupling line seam
Gap it is following, the upper end of second coupling line is the free end of open circuit.
In another embodiment of list trap ultra-wideband monopole antenna of the invention, the earth plate is covered under the medium substrate
The bottom on surface, the earth plate include major axis along rectangle medium substrate broadside extend half elliptic earth plate and with
The major axis of the connected rectangle earth plate of half elliptic earth plate one, the half elliptic earth plate and the oval radiation patch
Equal, short axle is also equal；The tangent line of the minor axis vertex of the half elliptic earth plate and the oval radiation patch bottom short axle top
Projection of the tangent line of point in the medium substrate plane overlaps.
In another embodiment of list trap ultra-wideband monopole antenna of the invention, the short axle top of the half elliptic earth plate
The groove of the central concave of the oriented half elliptic earth plate is opened up at point.
In another embodiment of list trap ultra-wideband monopole antenna of the invention, the side long of the medium substrate is 30mm,
Broadside is 20mm, thickness is 1mm；The top broadside phase of the minor axis vertex on the oval radiation patch top and the medium substrate
Cut, two summits of the major axis of the oval radiation patch are tangent with the both sides of medium substrate side long respectively；The oval spoke
The major axis of paster is penetrated for 20mm, short axle are 16mm；The major axis of the oval open-work is 10mm, short axle is 8mm, ellipse radiation
Spacing between the center of the center of paster and the oval open-work is 3.5mm；The length of the microstrip feed line is 14mm, and width is
2mm；The gap that is etched is rectangular aperture on band resistance resonant element, and the length of the rectangular aperture is 5mm, width is 1.6mm,
Under the distance between the top of the rectangular aperture and the top of the microstrip feed line and the following and microstrip feed line of rectangular aperture
The distance between side is 4.5mm；The length of first coupling line and the second coupling line is 4.8mm, width and is 0.2mm,
Coupling between first coupling line and the second coupling line is at intervals of 0.1mm；The right edge of first coupling line and the rectangular slits
The distance between the left side of the distance between right edge of gap and the second coupling line and left side of rectangular aperture are
0.55mm。
In another embodiment of list trap ultra-wideband monopole antenna of the invention, the groove is rectangular recess, and the rectangle is recessed
The width of groove is 4mm, cup depth is 2mm.
In another embodiment of list trap ultra-wideband monopole antenna of the invention, single trap ultra-wideband monopole antenna
Operating frequency range is 3.1GHz~10.6GHz, and trap scope is 5GHz~6GHz.
In another embodiment of list trap ultra-wideband monopole antenna of the invention, the material of the medium substrate is epoxy resin
Material, its relative dielectric constant is 4.1, and dielectric loss tangent value is 0.02；The characteristic impedance of the microstrip feed line is 50 ohm.
The beneficial effects of the invention are as follows：Single trap ultra-wideband monopole antenna of the invention etches band resistance on microstrip feed line
Resonant element, with band resistance and slow wave characteristic, trap characteristic is good, can effectively suppress the phase of radio ultra wide band system and wlan system
Mutually interference, and avoid the situation that the antenna radiation characteristics deterioration caused by fluting is etched in radiation patch.Band resistance is humorous
Shake the simple structure of unit, it is compact compact, it is easy to integrated, will not additionally increase the size of whole antenna, enable the antenna to realize
Miniaturization.The antenna has the advantages that small bandwidth, size, low cost, easy processing, has good in whole frequency band range
Directional diagram, but also the trap frequency that can select to need by length of the regulation with resistance resonant element, in short haul connection
There is application value higher in systematic difference.
Brief description of the drawings
Fig. 1 is the structural representation of list trap ultra-wideband monopole antenna embodiment of the invention；
Fig. 2 a are the right views of the trap ultra-wideband monopole antenna embodiment of present invention list shown in Fig. 1；
Fig. 2 b are the left views of the trap ultra-wideband monopole antenna embodiment of present invention list shown in Fig. 1；
Fig. 3 is the combination schematic diagram of single trap ultra-wideband monopole antenna embodiment shown in Fig. 2 a and Fig. 2 b；
Fig. 4 is that band hinders the structure of resonant element and shows in the trap ultra-wideband monopole antenna embodiment of present invention list shown in Fig. 3
It is intended to；
Fig. 5 is the ultra-wideband monopole antenna of list trap ultra-wideband monopole antenna embodiment of the invention and resonance free unit
Actual measurement standing wave contrast curve；
Fig. 6 is the xz surface radiation directional diagrams of list trap ultra-wideband monopole antenna embodiment actual measurement of the invention；
Fig. 7 is the yz surface radiation directional diagrams of list trap ultra-wideband monopole antenna embodiment actual measurement of the invention.
Specific embodiment
For the ease of understanding the present invention, below in conjunction with the accompanying drawings and specific embodiment, the present invention will be described in more detail.
Preferred embodiment of the invention is given in accompanying drawing.But, the present invention can be realized in many different forms, not limited
In the embodiment described by this specification.On the contrary, the purpose for providing these embodiments makes to the disclosure
Understand more thorough comprehensive.
It should be noted that unless otherwise defined, all of technology that this specification is used and scientific terminology with belong to
The implication that those skilled in the art of the invention are generally understood that is identical.The term for being used in the description of the invention is only
It is, in order to describe the purpose of specific embodiment, to be not intended to the limitation present invention.The term "and/or" bag that this specification is used
Include the arbitrary and all of combination of one or more related Listed Items.
In the description of specific embodiment of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ",
" on ", D score, "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", the orientation of instruction such as " outward " or
Position relationship is, based on orientation shown in the drawings or position relationship, to be for only for ease of the description present invention and simplify description, without
Be indicate or imply meaning device or element must have specific orientation, with specific azimuth configuration and operation, therefore not
It is understood that to be limitation of the present invention.Additionally, term " first ", " second " etc. are only used for describing purpose, and it is not intended that referring to
Show or imply relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, " first ", " second " are defined
Deng feature can express or implicitly include one or more this feature.In the description of the invention, unless otherwise
Illustrate, the implication of " multiple " refers to two or more.The term "and/or" that this specification is used includes one or more
The arbitrary and all of combination of related Listed Items.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Company ", " connection " should be interpreted broadly.For example, it may be being fixedly connected, or being detachably connected, or it is integrally connected；Can
Being to mechanically connect, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, Ke Yishi
Two connections of element internal.For the ordinary skill in the art, above-mentioned term can be understood by concrete condition
Concrete meaning in the present invention.
The present invention is illustrated to related terms first：
Antenna radiation pattern：Antenna direction function graft represents the directional diagram as antenna；
Voltage standing wave ratio VSWR (Voltage Standing Wave Ratio)：VSWR refers to standing wave, and (frequency and amplitude are homogeneous
With the ripple formed after, direction of vibration is consistent, the direction of propagation is opposite two row traveling waves superposition) voltage peak and voltage dips it
Than, when standing-wave ratio is equal to 1, represent that the impedance of feeder line and antenna is matched completely, now high-frequency energy is all gone out by aerial radiation,
There is no the reflection loss of energy；When standing-wave ratio is for infinity, total reflection is represented, energy does not radiate completely.That is,
Standing-wave ratio is bigger, and reflection power is higher, that is, impedance mismatch；
Passband：It is to refer to by wave filter without producing the signal frequency range for decaying；
Stopband：Decay in certain frequency range is more than a frequency range for setting；The upper limiting frequency of stopband with
The difference of lower frequency limit is referred to as bandwidth of rejection, that is, prevent the frequency range that signal passes through in certain frequency range；Stopband characteristic is namely
Out-of-band rejection characteristic, indicates the ability of wave filter filtering clutter, is to evaluate one of most important index of wave filter.
Centre frequency：It is the frequency in the middle of filter passband or stopband, equalization parameter standard is typically made of it to calculate
Some parameters；The corresponding wavelength of centre frequency is centre wavelength.
It is as shown in figures 1-4 the structure chart of present invention list trap ultra-wideband monopole antenna embodiment, the antenna includes being situated between
Matter substrate 6, the medium substrate is rectangle medium substrate, and the lower surface bottom of medium substrate 6 is provided with earth plate 2, the ground connection
Plate 2 is the structure wide with medium substrate 6；The upper surface of medium substrate 6 be provided with radiation patch 1 and with the phase of radiation patch 1
In the lower edge of microstrip feed line 4 even, the top of the overwrite media substrate of radiation patch 4, microstrip feed line 4 and radiation patch 1
It is connected at the heart and the long side direction along rectangle medium substrate is extended downwardly, and band resistance resonant element is etched with microstrip feed line 4
5。
Single trap ultra-wideband monopole antenna of the invention is made by engraving method on medium substrate 6,
Earth plate 2 is printed in the lower surface of medium substrate 6, radiation patch 1 and microstrip feed line 4 are printed in upper surface, then in microstrip feed line 4
On etch for trap band hinder resonant element 5.Band resistance resonant element 5 has band resistance and slow wave characteristic, and trap characteristic is good, energy
Enough effectively suppression radio ultra wide band systems are interfered with wlan system, and are avoided using the etching fluting in radiation patch 1
Mode caused by antenna radiation characteristics deterioration.The simple structure of band resistance resonant element 5, length can be less than in stopbands
Cardiac wave a quarter long, it is compact compact, it is easy to integrated, therefore will not additionally increase the size of whole antenna, enable the antenna to
Realize miniaturization.The antenna has the advantages that small bandwidth, size, low cost, easy processing, has good in whole frequency band range
Good directional diagram, but also the trap frequency that can select to need by length of the regulation with resistance resonant element 5.
In order to improve the pass-band performance of antenna, the feeder line of 50 ohm of 4 preferred characteristics impedance of the present embodiment microstrip feed line；Medium
Substrate 6 is made up of epoxide resin material, and its relative dielectric constant is 4.1, and dielectric loss tangent value is 0.02.The medium substrate 6
Side long for 30mm, broadside be 20mm, thickness be 1mm.
Further, the position that microstrip feed line 4 is closed in radiation patch 1 offers an open-work for penetrating the radiation patch
8, the open-work is etched in radiation patch 1.The present embodiment radiation patch 1 and open-work 8 are respectively major axis along rectangle medium substrate
The oval radiation patch that extends of broadside and oval open-work, the major semiaxis of oval radiation patch 1, semi-minor axis difference
It is R1、R2, the major semiaxis of oval open-work 8, semi-minor axis are respectively r1And r2.The center O of oval radiation patch 1aWith ellipse
The center O of open-work 8bIt is misaligned, and with spacing L, L is not equal to 0；Straight line where the short axle of oval radiation patch 1 and ellipse
Straight line is conllinear and parallel with the side long of rectangle medium substrate where the short axle of shape open-work 8.In addition, in oval radiation patch 1
The minor axis vertex in portion is tangent with the top broadside of medium substrate 6, two summits of the major axis of oval radiation patch 1 respectively with medium
The both sides side long of substrate 6 is tangent.The major axis of the major axis of oval radiation patch 1 and the ratio of short axle and oval open-work 8 with it is short
The ratio of axle is identical, i.e. R2/R1=r2/r1.The oval open-work 8 increased the active path of radiation current in radiation patch 1,
Contribute to antenna miniaturization.
The preferred 20mm of major axis, the preferred 16mm of short axle of the present embodiment ellipse radiation patch 1；The major axis of oval open-work is excellent
Select the preferred 8mm of 10mm, short axle, the major axis of oval radiation patch 1 and the ratio of short axle and the major axis and short axle of oval open-work 8
Ratio be R2/R1=r2/r1=0.8.The center of oval radiation patch 1 is excellent with the spacing L at the center of oval open-work 8
Select 3.5mm.Radiation patch is designed as the ellipse that major axis extends along medium substrate broadside by the present embodiment, is conducive to reducing
The size on medium substrate side long, is more conducive to antenna miniaturization.
In order to improve the band-stop response of single trap ultra-wideband monopole antenna, the present embodiment band hinders the structure of resonant element 5
As shown in Fig. 2 a, Fig. 3 and Fig. 4, band resistance resonant element 5 includes etching on microstrip feed line 4 and along microstrip feed line length direction
The gap 9 of extension, the first coupling parallel and that G is spaced with coupling is extended in gap 9 along the length direction of microstrip feed line 4
The coupling line 72 of zygonema 71 and second.The preferred rectangular aperture in gap 9 of the present embodiment, the edge microstrip feed line 4 long of the rectangular aperture
Length direction extend；Two equal lengths of coupling line and the respectively less than length on rectangular aperture side long, the first coupling line 71
The top of upper end integrally connected rectangular aperture, the lower end of the first coupling line 71 is the free end of open circuit, under the second coupling line 72
The following of integrally connected rectangular aperture is held, the upper end of the second coupling line 72 is the free end of open circuit.
The length of microstrip feed line 4 is 14mm in the present embodiment, and width is 2mm, and rectangular aperture is being arranged at microstrip feed line 4 just
Middle, length L2It is preferred that 5mm, width W2It is preferred that the distance between 1.6mm, the top of rectangular aperture and top of microstrip feed line 4
And the distance between following of the following and microstrip feed line 4 of rectangular aperture is 4.5mm；Two coupling lines it is equal sized,
Its length L3It is 4.8mm, width W3Be 0.2mm, the coupling between the first coupling line 71 and the second coupling line 72 at intervals of 0.1mm,
Distance of two free ends of coupling line apart from rectangular aperture correspondence up/down side is 0.2mm；First coupling line 71 and the second coupling
Zygonema 72 is arranged at the middle of rectangular aperture, the distance between the right edge of the first coupling line 71 and the right edge of rectangular aperture
And second the distance between the left side of left side and rectangular aperture of coupling line 72 be 0.55mm.
By length and two length of coupling line of the regulation with resistance resonant element rectangular aperture, it is possible to achieve to be pressed down
The frequency range of system is adjusted.When length, the length of coupling line when band resistance resonant element rectangular aperture increase, to be suppressed frequency range
Stopband center can be offset to low frequency direction；Conversely, when the length with resistance resonant element rectangular aperture, the length of coupling line reduce
When, the stopband center to be suppressed frequency range can offset to high frequency direction.
It should be noted that：Here the shape in gap 9 is not limited to rectangle, or any one has certain extension
Length and the shape of above-mentioned trap function can be realized.
Further, the bottom of the lower surface of 2 overwrite media substrate of earth plate 6 of the present embodiment, including a major axis is along Jie
Half elliptic earth plate 21 and a rectangle being connected with the one of half elliptic earth plate 21 that the broadside of matter substrate 6 extends
Earth plate 22, width of the major axis of half elliptic earth plate 21 with the side long of rectangle earth plate 22 with medium substrate 6 is equal；Half
Oval earth plate 21 is identical with the size of oval radiation patch 1, i.e. half elliptic earth plate 21 and oval radiation patch
Major axis it is equal, short axle is also equal.Semiellipse design is carried out to the earth plate first half, the shape kissing with radiation patch is allowed to
Close, effective electrical length on ground can be increased, increased current path, further help in antenna miniaturization.
In addition, the tangent line of the minor axis vertex of half elliptic earth plate 21 and the oval bottom minor axis vertex of radiation patch 1
Projection of the tangent line in medium substrate plane overlaps, further, in the present embodiment half elliptic earth plate minor axis vertex with it is ellipse
Projection of the minor axis vertex of circular radiation paster bottom in medium substrate plane overlaps.
Further, oriented half elliptic ground connection is opened up in the present embodiment at the minor axis vertex of half elliptic earth plate 21
The groove 3 of the central concave of plate, the groove extends along the side long of medium substrate and broadside respectively.The groove 3 of the present embodiment
It is preferred that rectangular recess, short axle of the rectangular recess on the half elliptic earth plate is symmetrical.Rectangular recess is along medium substrate broadside
The width W of extension1It is 4mm, along the cup depth L that medium substrate side long extends1It is 2mm.The rectangular recess can further improve
Antenna Impedance Matching characteristic, preferable impedance can be realized by the size for adjusting rectangular recess in frequency range very wide
Match somebody with somebody.
Need exist for explanation be：The shape of radiation patch 1, open-work 8 and earth plate 2 is not limited to ellipse, it is also possible to
It is rectangle or circle etc., as long as the distribution character of electric current can be changed in radiation patch and be conducive to according to applicable situation small-sized
The shape for changing design is within the scope of the present invention.
Selection and size based on the present embodiment medium substrate 6, it is right when the frequency band (stopband) of trap is 5GHz~6GHz
The centre frequency answered is 5.5GHz, according to related computing formula：Light velocity c
=3 × 108M/s, relative dielectric constant is 4.1, thus can calculate stopband center wavelength and be： The a quarter of so stopband center wavelength is 6.7mm or so, and the present embodiment band hinders resonance
The length preferred value of unit is 5mm, less than a quarter of stopband center wavelength.
Single trap ultra-wideband monopole antenna of the invention is by using the open-work 8 in radiation patch, earth plate 2 and groove
3 paths that can increase radiation current, improve Antenna Impedance Matching characteristic, so as to the miniaturization and broadband of realizing antenna set
Meter；With hindering the simple structure of resonant element 5, being easy to integrated, easy processing, length is less than the quarter-wave of stopband center,
The size of whole antenna will not additionally be increased.The operating frequency range of the antenna is 3.1GHz~10.6GHz, and trap scope is
5GHz~6GHz, can select the trap frequency for needing, in short range communication systems by adjusting the length of resonant element 5
There is application value higher in.
It should be noted that：What earth plate, radiation patch and microstrip feed line were used in the present invention is all the industry
General section bar, its thickness meets professional standard, repeats no more here.
If Fig. 5 is that list trap ultra-wideband monopole antenna embodiment of the invention is stayed with the actual measurement without band resistance resonant element antenna
Ripple contrast curve, wherein K1 are that the present invention has the standing wave curve map with resistance resonant element antenna embodiment, and K2 is to hinder humorous without band
Shake the standing wave curve map of element antenna.By the figure can be seen that 4.9GHz in 3.0GHz~11.3GHz frequency ranges~
6GHz frequency ranges (stopband), value of the present embodiment with the voltage standing wave ratio VSWR with resistance resonant element antenna is higher, and peak is very
To having reached 7.5 or so, it can be seen that the antenna has good trap characteristic in this frequency band, it is to avoid between wlan system
Interfere, the VSWR of other scopes is both less than 2, disclosure satisfy that the working frequency range requirement of FCC.Without design band resistance resonance
The antenna of unit, the VSWR values both less than 2 in whole frequency range, that is to say, that the antenna is in the range of 5GHz~6GHz without sunken
Wave property.
If Fig. 6 and Fig. 7 is the antenna pattern of trap ultra-wideband monopole antenna embodiment actual measurement of the present invention, define first
Once three-dimensional system of coordinate, plane where with medium substrate as level reference, the present embodiment regulation medium substrate broadside extension side
To being x-axis, side bearing of trend long is y-axis, and the axle extended perpendicular to plane where medium substrate is z-axis.According to above-mentioned coordinate system,
Fig. 6 show the antenna pattern in xz faces, and Fig. 7 show the antenna pattern in yz faces.By taking Fig. 6 as an example, the circumference in Fig. 6 divides
360 degree, therein 30,60 etc. represent angular dimension, radially represent normalized field intensity value, and unit is decibel (dB).In Fig. 6
Antenna pattern when solid line q1 represents the operating frequency of antenna as 4GHz, when dotted line q2 represents the operating frequency of antenna as 7GHz
Antenna pattern, antenna pattern when dotted line q3 represents the operating frequency of antenna as 10GHz, it is seen that these three frequencies are equal
With preferable circumferential omnidirectional radiation characteristic, 4GHz, 7GHz and 10GHz are that 3.1GHz~10.6GHz frequency ranges equal intervals are chosen
Three Frequency points, and not in the range of 5GHz~6GHz traps, show respectively the basic, normal, high frequency of the frequency band, have
It is representative.From Fig. 6 and Fig. 7, the antenna has good directional diagram, meets super wideband wireless system application requirement, has
Good radiation characteristic.
Trap ultra-wideband monopole antenna of the invention on microstrip feed line 4 by the way of band resistance resonant element 5 is etched
Trap is realized, simple structure, length are shorter, compact compact, will not additionally increase the size of whole antenna, enable the antenna to realize
Miniaturization；In addition, radiation patch and earth plate are more beneficial for the reduction of antenna length using horizontal ellipsoidal structure, while increasing
Effective electrical length of earth plate, increased current path, it helps antenna miniaturization；Rectangular recess on earth plate, can
Further to improve Antenna Impedance Matching characteristic, by the size of adjusting grooves can be realized in frequency range very wide compared with
Good impedance matching.
Should be only above embodiments of the invention, not thereby limit the scope of the claims of the invention, it is every using the present invention
The equivalent structure transformation that specification and accompanying drawing content are made, or other related technical fields are directly or indirectly used in, wrap
Include in scope of patent protection of the invention.
Claims (10)
1. a kind of single trap ultra-wideband monopole antenna, including medium substrate, the lower surface of the medium substrate is provided with ground connection
Plate, the upper surface of the medium substrate is provided with radiation patch and the microstrip feed line being connected with the radiation patch, its feature
It is that the medium substrate is rectangle medium substrate, the radiation patch covers the top of the medium substrate, the micro-strip
Feeder line be connected with the center of the lower edge of the radiation patch and along the rectangle medium substrate long side direction to downward
Stretch, band resistance resonant element is etched with the middle part of the microstrip feed line.
2. single trap ultra-wideband monopole antenna according to claim 1, it is characterised in that open the radiation patch bottom
It is provided with the open-work for penetrating the radiation patch.
3. single trap ultra-wideband monopole antenna according to claim 2, it is characterised in that the radiation patch and open-work
Oval radiation patch and oval open-work that respectively major axis extends along the broadside of rectangle medium substrate, and it is described ellipse
The center of circular radiation paster is misaligned with the center of the oval open-work, the short axle of the oval radiation patch with it is described
The short axle of oval open-work is conllinear and parallel with the side long of the rectangle medium substrate；The major axis of the oval radiation patch
Ratio with short axle is identical with the ratio of short axle with the major axis of the oval open-work.
4. single trap ultra-wideband monopole antenna according to claim 3, it is characterised in that the band resistance resonant element bag
Etching is included on the microstrip feed line and along the gap of microstrip feed line length direction extension, along described micro- in the gap
Ribbon feeder length direction is extended the first coupling line and the second coupling line parallel and be spaced with coupling, first coupling
The top in gap described in the upper end integrally connected of zygonema, the lower end of first coupling line is the free end of open circuit, described second
Gap is following described in the lower end integrally connected of coupling line, and the upper end of second coupling line is the free end of open circuit.
5. single trap ultra-wideband monopole antenna according to claim 4, it is characterised in that the earth plate covering is described
The bottom of medium substrate lower surface, the earth plate includes the semiellipse that major axis extends along the broadside of rectangle medium substrate
Shape earth plate and the rectangle earth plate being connected with half elliptic earth plate one, the half elliptic earth plate are ellipse with described
The major axis of circular radiation paster is equal, and short axle is also equal；The tangent line of the minor axis vertex of the half elliptic earth plate is ellipse with described
Projection of the tangent line of circular radiation paster bottom minor axis vertex in the medium substrate plane overlaps.
6. single trap ultra-wideband monopole antenna according to claim 5, it is characterised in that the half elliptic earth plate
Minor axis vertex at open up the oriented half elliptic earth plate central concave groove.
7. single trap ultra-wideband monopole antenna according to claim 6, it is characterised in that the side long of the medium substrate
For 30mm, broadside be 20mm, thickness be 1mm；
The minor axis vertex on the oval radiation patch top is tangent with the top broadside of the medium substrate, the oval spoke
Two summits for penetrating the major axis of paster are tangent with the both sides of medium substrate side long respectively；The length of the oval radiation patch
Axle is 20mm, short axle is 16mm；The major axis of the oval open-work is 10mm, short axle is 8mm, the oval radiation patch
Spacing between the center of center and the oval open-work is 3.5mm；
The length of the microstrip feed line is 14mm, and width is 2mm；The gap with being etched on resistance resonant element is rectangular slits
Gap, the length of the rectangular aperture is 5mm, width is 1.6mm, the top of the top of the rectangular aperture and the microstrip feed line
The distance between and the distance between following of following and microstrip feed line of rectangular aperture be 4.5mm；First coupling
The length of line and the second coupling line is 4.8mm, width and is 0.2mm, between first coupling line and the second coupling line
Coupling is at intervals of 0.1mm；The distance between the right edge of first coupling line and right edge of the rectangular aperture and
The distance between the left side of two coupling lines and the left side of rectangular aperture are 0.55mm.
8. single trap ultra-wideband monopole antenna according to claim 7, it is characterised in that the groove is that rectangle is recessed
Groove, the width of the rectangular recess is 4mm, cup depth is 2mm.
9. single trap ultra-wideband monopole antenna according to claim 8, it is characterised in that single trap ultra wide band list
The operating frequency range of pole sub-antenna is 3.1GHz~10.6GHz, and trap scope is 5GHz~6GHz.
10. the single trap ultra-wideband monopole antenna according to any one of claim 1~9, it is characterised in that the medium
The material of substrate is epoxide resin material, and its relative dielectric constant is 4.1, and dielectric loss tangent value is 0.02；The micro-strip feedback
The characteristic impedance of line is 50 ohm.
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| CN201710014062.1A CN106785463A (en) | 2017-01-09 | 2017-01-09 | A kind of single trap ultra-wideband monopole antenna |
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| CN201710014062.1A CN106785463A (en) | 2017-01-09 | 2017-01-09 | A kind of single trap ultra-wideband monopole antenna |
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