CN206595382U - monopole ultra-wideband antenna - Google Patents
monopole ultra-wideband antenna Download PDFInfo
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- CN206595382U CN206595382U CN201621061176.9U CN201621061176U CN206595382U CN 206595382 U CN206595382 U CN 206595382U CN 201621061176 U CN201621061176 U CN 201621061176U CN 206595382 U CN206595382 U CN 206595382U
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- radiating element
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- wideband antenna
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Abstract
The utility model discloses a kind of monopole ultra-wideband antenna, to improve the performance of radio ultra wide band system.Monopole ultra-wideband antenna includes disclosed in the utility model：Radiating element, floor and coaxial feeder；The coaxial feeder inner wire is connected on radiating element through floor, outer conductor ground connection；The radiating element uses the circular trough for being dug on the ellipsoidal structure of edge gradual change, the oval radiating element and having an inscribe, and the center of circle of the circular trough is located on the upper semi-minor axis of the oval radiating element.Ellipsoidal structure radiating element disclosed in the utility model is compared to traditional rectangular radiation plane, and antenna impedance bandwidth improves obvious, and antenna H radiances are dramatically increased.And conveniently parasitic structure is loaded without influenceing antenna size in circular trough, to reduce interfering of existing between system, realize the trap function to some frequency bands.
Description
Technical field
The utility model is related to antenna technical field, more particularly to a kind of monopole ultra-wideband antenna.
Background technology
Ultra wide band (Ultra-wide band, UWB) technology, away from modern existing more than 50 years developing history, is a kind of utilization
The pulse communication technology that frequency spectrum extremely wide ultrashort pulse is communicated, also known as baseband communication, in radar, sensing and military communication
There is more application in system.2 months 2002, FCC promulgate regulation in, by 3.1GHz~10.6GHz
As the frequency spectrums of operation scope of ultra-wideband antenna, and it is allowed to be used for civil area.
Antenna plays vital effect in a wireless communication system, and its function is radiation or reception space electromagnetism
Ripple.Ultra wide band (Ultra-wide band, UWB) antenna has highly important effect in ultra-wideband systems, directly governs
The performance of radio ultra wide band system.As the front end of receiving and transmitting signal, there are many requirements to UWB antennas.For example ensureing ultra wide band work
On the premise of making frequency range, it is ensured that the compact conformation of antenna is in order to integrated；Because working frequency range is wide, how to avoid and other days
Line is interfered.Therefore, the design of ultra-wideband antenna faces more challenges.
Wherein, the system that working frequency meets one of following condition, can be referred to as radio ultra wide band system.Both conditions
It is respectively：
1st, the expression formula of regulation system bandwidth is as follows：
Wherein, fHAnd fLIt is the highest frequency and low-limit frequency of system work -10dB bandwidth respectively.Work as Bf>When 0.2, this
Individual system can be referred to as radio ultra wide band system.
2nd, as the absolute bandwidth f of signalH-fLDuring≤500MHz, this system may also be referred to as being radio ultra wide band system.
Utility model content
Main purpose of the present utility model is to disclose a kind of monopole ultra-wideband antenna, to improve the property of radio ultra wide band system
Energy.
For up to above-mentioned purpose, monopole ultra-wideband antenna disclosed in the utility model, including：Radiating element, floor and same
Feeder shaft；The coaxial feeder inner wire is connected on radiating element through floor, outer conductor ground connection；The radiating element uses side
The ellipsoidal structure of edge gradual change
Preferably, the circular trough for having an inscribe is dug on above-mentioned oval radiating element, the center of circle of the circular trough is located at should
On the upper semi-minor axis of oval radiating element.
Ellipsoidal structure radiating element disclosed in the utility model is compared to traditional rectangular radiation plane, antenna impedance band
Width improves obvious, and then can improve the performance of radio ultra wide band system；And after further circular trough is opened up, antenna H radiances
Dramatically increase.Meanwhile, open up after circular trough, the convenient parasitic structure that loaded in circular trough is without influenceing antenna size, to reduce
What is existed between system interferes, and realizes the trap function to some frequency bands.
Based on above-mentioned monopole ultra-wideband antenna, it may be such that in voltage standing wave ratio VSWR<When 2, working band is covered
3.1GHz-15GHz, reflectance factor is less than 0.3162.
Preferably, trap construction unit, and the trap structure are loaded with the circular trough of above-mentioned monopole ultra-wideband antenna
The current direction of unit is opposite with radiating element current direction in suppressed frequency band.Optionally, the trap construction unit can be described
The parasitic T-shaped in circular trough bottom or the cross open-circuit structure for WLAN frequency ranges.
Further, when using cross open-circuit structure, it is preferable that the semimajor axis length of oval radiating element：It is ellipse
The semi-minor axis length of circular radiation unit：The radius length of circular trough：The vertical pivot length of cross open-circuit structure：Cross is opened a way
The transverse axis length of structure：Width=15 of cross open-circuit structure transverse axis and the longitudinal axis：10：8：12.5：7：1, and decussate texture
Transverse axis or so be distributed symmetrically, the distribution proportion above and below vertical pivot intersection point is=7：5.5.Based on the cross open-circuit structure, it can make
Obtain in VSWR<When 2, working band is 3.1-5.16GHz and 5.9-15GHz；Work as VSWR>When 2, the stopband frequency range of antenna is
5.16-5.9GHz。
Brief description of the drawings
, below will be to institute in embodiment in order to illustrate more clearly of the embodiment of the present application or technical scheme of the prior art
The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only described in the utility model
Some embodiments, for those of ordinary skill in the art, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation of monopole ultra-wideband antenna provided by the utility model；
Fig. 2 is the structural representation of the monopole ultra-wideband antenna provided by the utility model with trap.
Embodiment
Core of the present utility model is to provide a kind of monopole ultra-wideband antenna.In the utility model embodiment, antenna
Input impedance be reflect antenna circuit characteristic parameter, be exactly the input impedance of antenna in the impedance of antenna input, definition
For：
Wherein, Pin is the input power of antenna, and Vin is the input voltage of antenna, and Iin is antenna input current, and Rin is
The input resistance of antenna, includes the loss resistance Rl and radiation resistance Rrad of input current.Xin is the input reactance of antenna, it
A part of input power is converted into energy, is stored near antenna surface, rather than launch to free space.
Impedance bandwidth is the bandwidth that reflection power is less than 10% when the matches impedances between antenna and transmission line.Impedance
Bandwidth, which is mainly, two characteristic parameters：Voltage standing wave ratio (Voltage Standing Wave Ratio, VSWR) and echo are damaged
Consume (Return Loss, RL).The two characteristic parameters are relevant all with the reflectance factor Γ of terminal voltage, and Γ definition is reflection
Ratio between ripple and incident wave voltage；Wherein, the definition of voltage standing wave ratio (VSWR) is the maximum and minimum of voltage standing wave(VSW)
The ratio of value：
Return loss (RL) is another feature parameter of impedance matching, and definition is：
RL=-20log (| Γ |) formula (4)
In addition, the figure that the radiation parameter that the antenna pattern of antenna is antenna changes with direction in space is represented.General feelings
Under condition, the antenna pattern of antenna is determined in far-field region, and convert it to the pattern function of coordinate on direction in space.Engineering
The upper directionality for defining antenna is typically come table with the antenna directional diagram that two are mutually perpendicular in plane on greatest irradiation direction
Show, they are referred to as E faces directional diagram and H faces directional diagram.E faces are the planes with electric field vector parallel, and H faces are and magnetic vector
Parallel plane, directional diagram most can intuitively reflect size of the electromagnetic field in spatial distribution.
In order that those skilled in the art more fully understands the technical solution of the utility model, below in conjunction with accompanying drawing pair
The utility model is further detailed.
The utility model embodiment discloses a kind of monopole ultra-wideband antenna first, as shown in figure 1, including：Radiating element
(1), floor (2) and coaxial feeder (3).Wherein, coaxial feeder inner wire is connected on radiating element through floor, and outer conductor connects
Ground；The radiating element uses the circular trough for being dug on the ellipsoidal structure of edge gradual change, the oval radiating element and having an inscribe, should
The center of circle of circular trough is located on the upper semi-minor axis of the oval radiating element.
In the present embodiment, circular trough, which is selected in appropriate scope, selects different radius of circles little to return loss effects,
And meet ultra wide band requirement.Monopole ultra-wideband antenna based on the structure, in VSWR<When 2, working band is covered
3.1GHz-15GHz, reflectance factor is less than 0.3162.
【Comparative example】：It is radiating element with Fig. 1 difference, in the case where not increasing and decreasing antenna size, adopts
With traditional rectangular surfaces as replacement, the antenna is emulated with CST softwares, the return loss obtained in its working frequency range is equal
More than -10dB；And Surface current distribution of the antenna in frequency (5.3GHz), feed end can be seen that by the antenna surface figure
A large amount of electric currents are generated near mouthful, these electric currents formation standing wave, or port is reflected back, cause emitted energy to obtain a large amount of damages
Consumption, it is impossible to be radiated.It is probably because the radiator plane of rectangle is mutated at edge to cause the reason for reflection loss increases.Therefore
The antenna can not be operated in ultra wideband frequency.
And in the present embodiment, in same frequency, elliptical antenna surface current density is significantly less than squaerial, explanation
The most of energy fed through feeder line has all been radiated space, only fraction electric current formation standing wave.Moreover, new in this practicality
In type, even if not opening up above-mentioned circular trough, when return loss is less than -10dB, the bandwidth of operation of antenna is 3.1-15GHz, is covered
Cover VSWR in ultra wide band frequency, working frequency range and be less than 2, and the radiation direction of antenna does not have significant change；But open up
Visible by H faces directional diagram under rectangular coordinate system after circular trough, structure optimization aft antenna H radiances increase before relatively optimizing
0.3dB.Therefore, even if radiating element uses the elliptical gradient structure in the present embodiment without opening up circular trough, also comply with super
The design requirement of broad-band antenna, and then the performance of radio ultra wide band system can be improved.
Ellipsoidal structure radiating element disclosed in the utility model is compared to traditional rectangular radiation plane, antenna impedance band
Width improves obvious, and then can improve the performance of radio ultra wide band system；And after further circular trough is opened up, antenna H radiances
Dramatically increase.Meanwhile, open up after circular trough, the convenient parasitic structure that loaded in circular trough is without influenceing antenna size, to reduce
What is existed between system interferes, and realizes the trap function to some frequency bands.
Further, the present embodiment is also loaded with trap construction unit on above-mentioned circular trough, the trap construction unit
Current direction with radiating element current direction in suppressed frequency band on the contrary, to realize the trap function to some frequency bands.Optionally, should
Trap construction unit is the parasitic T-shaped open-circuit structure in the circular trough bottom.
For WLAN frequency ranges, it is preferable that as shown in Fig. 2 trap construction unit disclosed in the present embodiment is the rounded trough bottom
The parasitic cross open-circuit structure (4) in portion.Cross-shaped configuration different parameters are scanned with CST softwares, can be obtained：Due to cross
The addition of type structure, can produce a stopband, for the scanning of 5 add parameters, in 5.16-7.24GHz frequency band on frequency band
In the range of generate 5 notch bandwidths, when wherein maximum bandwidth is add=1mm, resistance band 1.24GHz, stopband center frequency is
6.5GHz, echo reflection gain is -3.22dB；When minimum bandwidth is add=5mm, resistance band 0.74GHz, stopband center frequency
Rate is 5.49GHz, and echo reflection gain is -1.74dB.Thereby, cross-shaped configuration is wider in high frequency bandwidth, low frequency narrower bandwidth,
Return loss gain is relatively low in high frequency, and low frequency is higher.Illustrate that it has good Stopband Performance, and bandwidth in lower band
Degree can also cover WLAN bin widths.Therefore select the cross-shaped configuration and wanted to realize that the sunken performance of UWB aerial band can meet design
Ask.
Structure based on Fig. 2, size, the shape of parasitic structure is most important to the band resistance performance impact of antenna.Further
, parameter and numerical value such as table 1 for a kind of ultra-wideband antenna of optimization of WLAN frequency ranges：
Table 1：
Wherein, e_LR is semi-major axis, and e_SR is semi-minor axis, and c_r is circular groove radius, and add is the transverse axis of cross vertical pivot
Above section, h1 is part below the transverse axis of cross vertical pivot, and w is the width of cross transverse axis and vertical pivot, and t is cross transverse axis
It is symmetrical with the right half part of vertical pivot.
In other words, i.e. the semimajor axis length of the oval radiating element：The semi-minor axis length of the oval radiating element：Should
The radius length of circular trough：The vertical pivot length of the cross open-circuit structure：The transverse axis length of the cross open-circuit structure：The cross
Width=15 of shape open-circuit structure transverse axis and the longitudinal axis：10： 8：12.5：7：1, and the transverse axis of the decussate texture or so distribution pair
Claim, the distribution proportion above and below vertical pivot intersection point is=7：5.5.
The corresponding parametric values of structure shown in table 1 are relied on, may be such that the monopole ultra-wideband antenna has stable radiation special
Property and trap characteristic, are specifically included：In VSWR<When 2, working band is 3.1-5.16GHz and 5.9-15GHz；Work as VSWR>2
When, the stopband frequency range of antenna is 5.16-5.9GHz.
Some one exemplary embodiments of the present utility model are only described by way of explanation above, undoubtedly, for
One of ordinary skill in the art, can be with a variety of in the case of without departing from spirit and scope of the present utility model
Mode is modified to described embodiment.Therefore, above-mentioned accompanying drawing and description are inherently illustrative, should not be construed as
Limitation to the utility model claims.
Claims (6)
1. a kind of monopole ultra-wideband antenna, it is characterised in that including：Radiating element, floor and coaxial feeder；The coaxial feed
Line inner wire is connected on radiating element through floor, outer conductor ground connection；The radiating element is tied using the ellipse of edge gradual change
Structure.
2. monopole ultra-wideband antenna according to claim 1, it is characterised in that being dug on the oval radiating element has
The circular trough of one inscribe, the center of circle of the circular trough is located on the upper semi-minor axis of the oval radiating element.
3. monopole ultra-wideband antenna according to claim 2, it is characterised in that trap knot is loaded with the circular trough
Structure unit, the current direction of the trap construction unit is opposite with radiating element current direction in suppressed frequency band.
4. monopole ultra-wideband antenna according to claim 3, it is characterised in that the trap construction unit is the circle
The parasitic T-shaped open-circuit structure of shape trench bottom.
5. monopole ultra-wideband antenna according to claim 3, it is characterised in that the trap construction unit is directed to WLAN
Frequency range, is the parasitic cross open-circuit structure in the circular trough bottom.
6. monopole ultra-wideband antenna according to claim 5, it is characterised in that half length of the oval radiating element
Shaft length：The semi-minor axis length of the oval radiating element：The radius length of the circular trough：The cross open-circuit structure
Vertical pivot length：The transverse axis length of the cross open-circuit structure：The width of the cross open-circuit structure transverse axis and the longitudinal axis=
15：10：8：12.5：7：1, and the transverse axis of the decussate texture or so is distributed symmetrically, the distribution proportion above and below vertical pivot intersection point is
=7：5.5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621061176.9U CN206595382U (en) | 2016-09-18 | 2016-09-18 | monopole ultra-wideband antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621061176.9U CN206595382U (en) | 2016-09-18 | 2016-09-18 | monopole ultra-wideband antenna |
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| Publication Number | Publication Date |
|---|---|
| CN206595382U true CN206595382U (en) | 2017-10-27 |
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ID=60129873
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621061176.9U Expired - Fee Related CN206595382U (en) | 2016-09-18 | 2016-09-18 | monopole ultra-wideband antenna |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106252852A (en) * | 2016-09-18 | 2016-12-21 | 北京石油化工学院 | Monopole ultra-wideband antenna |
| CN108172991A (en) * | 2017-12-15 | 2018-06-15 | 南京航空航天大学 | A kind of super wide band plane single pole sub antenna |
| CN109244651A (en) * | 2018-10-30 | 2019-01-18 | 王俊涛 | Omnidirectional antenna and its parameter determination method |
-
2016
- 2016-09-18 CN CN201621061176.9U patent/CN206595382U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106252852A (en) * | 2016-09-18 | 2016-12-21 | 北京石油化工学院 | Monopole ultra-wideband antenna |
| CN108172991A (en) * | 2017-12-15 | 2018-06-15 | 南京航空航天大学 | A kind of super wide band plane single pole sub antenna |
| CN108172991B (en) * | 2017-12-15 | 2018-12-07 | 南京航空航天大学 | A kind of super wide band plane single pole sub antenna |
| CN109244651A (en) * | 2018-10-30 | 2019-01-18 | 王俊涛 | Omnidirectional antenna and its parameter determination method |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171027 Termination date: 20200918 |