CN204538233U - Ultra-wideband elliptical monopole cylindrical conformal antennas - Google Patents
Ultra-wideband elliptical monopole cylindrical conformal antennas Download PDFInfo
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- CN204538233U CN204538233U CN201520154810.2U CN201520154810U CN204538233U CN 204538233 U CN204538233 U CN 204538233U CN 201520154810 U CN201520154810 U CN 201520154810U CN 204538233 U CN204538233 U CN 204538233U
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Abstract
The utility model discloses a kind of oval monopole antenna, relate to a kind of ultra-wideband elliptical monopole cylindrical conformal antennas, it is by a central aperture and the elliptic radiation unit of both sides fluting, double trapezoid combine co-planar waveguide and grading structure floor, edge is formed.Monopole is the ellipse that axial ratio equals 1.3, a circular hole is opened by the middle of ellipse patch, realize bandwidth match, respectively drive an oval groove on ellipse patch both sides, improve the omni-directional of antenna, double trapezoid combination co-planar waveguide is adopted to carry out feed, regulate antenna feed impedance, use grading structure floor, edge, realize ultra broadband impedance bandwidth and good omni-directional radiation, conformal with cylinder, be convenient to the integrated of antenna.This antenna section is low, volume is little, structure is simple, easy to process, and easily conformal with carrier, have ultra wideband, effective bandwidth of operation is 2.2 ~ 14.1GHz, and radiation characteristic is stable, is applicable to short distance ultra-wideband communications.
Description
Technical field
The utility model relates to a kind of oval monopole antenna, particularly a kind of cylindrical conformal antennas with ultra broadband characteristic, and effective bandwidth of operation is 2.2 ~ 14.1GHz, and radiation characteristic is stablized, and is applicable to short distance ultra-wideband communications, belongs to wireless communication technology field.
Background technology
Along with the develop rapidly of wireless communication technology, ultra-wideband communication system receives much concern with its low-power consumption, low cost, high security, High Data Rate and the advantage such as anti-interference.The domestic and international recent report printed monopole antenna of some novelties, has expanded application while reducing antenna volume.Square unipolar, disk monopole, pentagon and hexagon monopole all have wider working band, good antenna pattern, but due to its nonplanar structure, ground level is vertical with radiating element, can not integrate with printed circuit easily, limit its application.Rectangle, circle, ellipse and the circle, the half elliptic monopole antenna that improve have ultra broadband characteristic in various degree, can with sphere or Cylindrical Conformal, obtain ultra broadband conformal antenna.Adopt microstrip line to carry out feed to disk or square unipolar sub antenna, in the bandwidth of 3 ~ 4 frequencys multiplication, there is good electrical property.For microstrip line, co-planar waveguide, relative to microstrip line, has that radiation dispersion is low, loss is little, circuit is easy of integration, can go here and there with other components and parts and the advantage such as to be connected.At present, antenna for base station and portable antenna all need conformal antenna, and its structure of conformal antenna is easy and carrier is conformal, thus saves space, and military and civilian has a wide range of applications space.Therefore, significant to the research of ultra broadband conformal antenna.Choosing the design of ultra-wideband antenna of conformal carrier is most important, has the change of carrier characteristics to the report of conformal antenna performance impact aspect, arrowband, but relatively less for the research of ultra broadband conformal antenna.
Utility model content
The purpose of this utility model is to provide the oval monopole cylindrical conformal antennas that a kind of section is low, volume is little, structure is simple, easy to process, easy and carrier is conformal, and its radiation characteristic is stablized, and can be used for the conformal unit of antenna.
The technical solution of the utility model is, F4B medium substrate is printed on a central aperture and the elliptic radiation unit (1) of both sides fluting, double trapezoid combination co-planar waveguide (2) and grading structure floor, edge (3), monopole is the ellipse that axial ratio equals 1.3, a circular hole is opened by the middle of ellipse patch, realize bandwidth match, an oval groove is respectively driven on ellipse patch both sides, effective current path during increase antenna low frequency, improve the omni-directional of antenna, by double trapezoid combination co-planar waveguide mode, feed is carried out to it, regulate antenna feed impedance, reduce radiation loss, the lower end of co-planar waveguide is connected with coaxial fitting inner wire, so that external coaxial line, use grading structure floor, edge, realize ultra broadband impedance bandwidth and good omni-directional radiation, the gap of 0.25mm is provided with between the ground plane of medium substrate lower end and co-planar waveguide, conformal with cylinder, be convenient to the integrated of antenna.
Effect of the present utility model is: this antenna is conformal with cylinder, have that section is low, volume is little, structure is simple, easy to process, easily and the feature such as carrier is conformal, by regulating Circularhole diameter, floor edge and notch size, realize bandwidth match, utilize double trapezoid to combine co-planar waveguide conduction band to encourage gap as feed, very wide impedance bandwidth can be obtained, reduce radiation loss, improve circuit level.Using this antenna as radiating element Conformal with cylinder, labor cylinder radius and length variations on the impact of conformal antenna performance, for choosing of the conformal carrier of ultra broadband conformal antenna provides reliable basis.This antenna has ultra wideband, and effective bandwidth of operation is 2.2 ~ 14.1GHz, is applicable to short distance ultra-wideband communications.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model example.
Fig. 2 is the structural representation after the utility model example and Cylindrical Conformal.
Fig. 3 is that the utility model example standing-wave ratio is with notch radius r
1variation characteristic.
Fig. 4 is that the utility model example standing-wave ratio is with coupling aperture r
2variation characteristic.
Fig. 5 is that the utility model example standing-wave ratio is with ellipse radii r
3variation characteristic.
Fig. 6 is that different gradual change constant a is on the impact of the utility model example reflection coefficient.
Fig. 7 is the utility model example reflection coefficient S
11with the characteristic curve that cylinder radius R changes.
Fig. 8 is the change of the utility model example E surface radiation characteristic with cylinder radius R.
Fig. 9 is the change of the utility model example H surface radiation characteristic with cylinder radius R.
Figure 10 is the utility model example reflection coefficient S
11with the characteristic curve that cylinder radius L changes.
Figure 11 is the change of the utility model example E surface radiation characteristic with cylinder radius L.
Figure 12 is the change of the utility model example H surface radiation characteristic with cylinder radius L.
Figure 13 is the utility model example actual measurement reflection coefficient S
11curve compares with simulation value.
Figure 14 be the utility model example frequency be 5.8,14.1,18.6GHz time E face gain pattern.
Figure 15 be the utility model example frequency be 5.8,14.1,18.6GHz time H side gains directional diagram.
Embodiment
Embodiment of the present utility model is: as shown in Figure 1, and this ultra-wideband elliptical monopole antenna is by the central aperture be printed on medium substrate and the elliptic radiation unit (1) of both sides fluting, co-planar waveguide (2), grading structure floor, edge (3) and external coaxial fitting (4) are formed.Monopole is the ellipse that axial ratio equals 1.3, a circular hole is opened by the middle of ellipse patch, realize bandwidth match, an oval groove is respectively driven on ellipse patch both sides, effective current path during increase antenna low frequency, improve the omni-directional of antenna, utilize double trapezoid to combine co-planar waveguide (2) conduction band to encourage gap as feed, regulate antenna feed impedance, the lower end of co-planar waveguide is connected with coaxial fitting (4) inner wire, so that external coaxial line, gap g=0.25mm between the ground plane of medium substrate lower end and co-planar waveguide, use grading structure floor, edge, realize ultra broadband impedance bandwidth and good omni-directional radiation, edge is exponential fade structure, gradual change form is y=e
ax+ b, wherein a is gradual change constant, conformal with cylinder, is convenient to the integrated of antenna.
Antenna is printed on the F4B substrate of long l=50mm, wide w=50mm, substrate thickness h=0.2mm, and its dielectric constant is 2.55, and dielectric loss is 0.001.Due to the thinner thickness of dielectric material, adopt the microstrip-fed input impedance being not easy acquisition 50 Ω, therefore adopt double trapezoid combining form to regulate input impedance, the gap initial value on conduction band and floor is g=0.2mm.Use HFSS simulation software to be optimized design, draw the initial configuration size of antenna: r
1=3mm, r
2=5mm, r
3=9mm, l
1=9mm, l
2=16mm, c=8mm, w
1=6mm, w
2=3mm, w
3=5mm, as shown in Figure 1.Choose cylinder as conformal carrier, length L=60mm, radius R=30mm, as shown in Figure 2.
HFSS software is utilized to analyze antenna model, to major parameter notch radius r
1, coupling aperture r
2, ellipse radii r
3analyzing with gradual change constant a, improving impedance matching property by regulating these three parameters.
Fig. 3 is that the utility model example standing-wave ratio is with notch radius r
1variation characteristic.As can be seen from the figure, the gradual degree impact of notch size on antenna standing wave ratio is comparatively large, and along with the increase of notch radius, standing-wave ratio becomes more mild, r
1choose the impact of low-frequency range more more remarkable than high band, work as r
1during=2.8mm, low-frequency cut-off frequency is best.
Fig. 4 is planar elliptical monopole antenna coupling aperture r
2during change, antenna input vswr is with the change of frequency.As can be seen from the figure, position perforate suitable on radiating element can change metal surface current direction, effectively reduces required bandwidth standing internal wave ratio, improves Antenna Operation bandwidth, along with r
2increase, standing-wave ratio has larger fluctuation in frequency band range, causes impedance periodically to mate and mismatch, at the peak value that about 19GHz also occurs, works as r
2during=5.2mm, coupling is good.
Fig. 5 is that standing-wave ratio is along with ellipse radii r
3variation characteristic.As can be seen from the figure, r
3change comparatively large to the performance impact of antenna, also very large on the cut-off frequency impact of high band, work as r
3during=9mm, there is VSWR > 2 at 21.3 ~ 25.5GHz place, worked as r
3during=10mm, there is VSWR > 2 in 15.2 ~ 27GHz scope, illustrated r thus
3selection directly have influence on the service behaviour of antenna, work as r
3during=10.8mm, high-frequency cut-off frequency can be made to move right, expand the bandwidth of high band.
Give in Fig. 6 other structural parameters choose the condition of optimal value under reflection coefficient corresponding to different gradual change constant a with frequency variation curve.As can be seen from the figure, during a=-0.2, floor edge grading structure makes antenna near 3.6GHz, 12.4GHz, 17.8GHz, 21.7GHz, 24.3GHz, 30.3GHz, obtain good resonance characteristic.Antenna is less than-10dB at the frequency band range reflection coefficient of 2.5 ~ 32GHz, and highest frequency place does not occur cut off phenomenon.Coplanar waveguide floor had both served the effect of aerial ground, was equivalent to again a distributed matcher network, defined the multi-resonant of antenna, ultra broadband characteristic.Each parameter is scanned, gets optimal value simultaneously, obtain optimum standing-wave ratio characteristic.
By above analysis, draw the main structure parameters of planar elliptical monopole antenna: r
1=2.8mm, r
2=5.2mm, r
3=10.8mm, l
1=8.8mm, l
2=16.6mm, c=7.6mm, w
1=8.2mm, w
2=2.8mm, w
3=4.7mm, g=0.25mm, a=-0.2.
Cylindrical carrier is foamed material, and dielectric constant is ε
r=1.03.Fig. 7 shows reflection coefficient S when cylinder radius R changes
11change curve, choose 3 ~ 25GHz as with reference to frequency range.As can be seen from Figure, the change of R causes antenna to offset at high band resonances point to the right, causes impedance match situation also to there occurs change, but little to overall bandwidth contributions.When R is about a medium wavelength 20mm, reflection coefficient curve is sunk the darkest.When R value increases, reflection coefficient curve and the flat plane antenna of conformal antenna are more and more close.Therefore, for given antenna structure, R value is larger, and conformal antenna is more close to flat plane antenna, and its standing wave performance, also more close to plane performance, is coincide with theory.Therefore, when designing conformal antenna, can the performance parameter of reference planes antenna.Fig. 8, Fig. 9 show antenna at E face and H surface radiation directional diagram with the variation characteristic of R, choose operating frequency f=7.5GHz.As can be seen from the figure, the change of the directional diagram in E face is little, and H face directional diagram slightly strengthens along with the Enhanced Radiation Reduced Blast of R, and radius R is larger, and directional radiation properties is stronger, and gain is relatively higher.
Antenna S as shown in Figure 10
11with the variation characteristic of L.As can be seen from the figure, the change of L also can cause resonance point to offset to the right, and impedance match situation also there occurs change, and the reflection coefficient curve when L is about the medium wavelength 50mm of 2.5 times is sunk the darkest.At the low-frequency range of 3 ~ 7GHz and the high band of 17 ~ 25GHz, reflection coefficient S
11change greatly, when L is 70mm, there is mismatch phenomenon in high frequency treatment, creates certain influence to available bandwidth.Figure 11, Figure 12 show antenna at E face and the H surface radiation directional diagram variation characteristic with L, and the input impedance impact of cylinder length on conformal antenna is less, and cylinder is longer, and the fluctuating of directional diagram is less, otherwise larger.The radiation characteristic of antenna fluctuates with the change of L, and as L=60mm, the gain of antenna is relatively large, and radiation characteristic is better, and directionality obviously strengthens.When L increases, the directed radiation in E face and H face also weakens thereupon.
Conformal carrier selects dielectric constant to be the foamed material of 2.08, conformal carrier radius R=20mm, height L=60mm.By vector network analyzer, antenna reflection coefficient is measured, and actual measurement and simulation result are contrasted, as shown in figure 13, as can be seen from the figure, the frequency range measured result that return loss is less than-10dB is 2.2GHz ~ 21.8GHz, antenna has wider impedance operator, resonance point is respectively 5.6GHz, 14.1GHz and 18.8GHz, contrast with simulation result, offset to the right, the reason of frequency shift (FS) is that dielectric-slab relative dielectric constant exists error, and manual welding feed part introduces loss, and test environment produces certain influence to measurement result.The gain pattern of resonance point is as shown in Figure 14, Figure 15, the antenna pattern of antenna is better, because the CURRENT DISTRIBUTION on radiation patch during high frequency and floor changes, the E face directional diagram of antenna there will be secondary lobe, the omni-directional of H face directional diagram has obvious deterioration relative to low frequency, because lobe during high frequency worsens serious, on the whole or omnidirectional, available frequency band covers 2.2 ~ 14.1GHz.
Experiment shows r
1, r
2, r
3, the parameter such as a all can produce significant impact to antenna impedance bandwidth sum resonance frequency.Impedance operator and the radiation characteristic of conformal aft antenna change, and the change of cylinder radius R can cause antenna high band resonances point to offset, and chooses less radius R, the radiation characteristic of antenna can be improved, when L is less, the radiation gain of antenna is relatively large, and directionality strengthens.Therefore, the performance of selection to antenna of conformal carrier is most important.This antenna available frequency band covers 2.2 ~ 14.1GHz, and actual measurement and simulation result coincide good, and in working frequency range, radiation characteristic is stablized, and structure is simple, easy to process.
Claims (1)
1. a ultra-wideband elliptical monopole cylindrical conformal antennas, by a central aperture and both sides fluting elliptic radiation unit (1), double trapezoid combination co-planar waveguide (2) and grading structure floor, edge (3) are formed, it is characterized in that: monopole is the ellipse that axial ratio equals 1.3, a circular hole is opened by the middle of ellipse patch, realize bandwidth match, an oval groove is respectively driven on ellipse patch both sides, effective current path during increase antenna low frequency, improve the omni-directional of antenna, by double trapezoid combination co-planar waveguide mode, feed is carried out to it, regulate antenna feed impedance, reduce radiation loss, the lower end of co-planar waveguide is connected with coaxial fitting inner wire, so that external coaxial line, use grading structure floor, edge, realize ultra broadband impedance bandwidth and good omni-directional radiation, the gap of 0.25mm is provided with between the ground plane of medium substrate lower end and co-planar waveguide, conformal with cylinder, be convenient to the integrated of antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520154810.2U CN204538233U (en) | 2015-03-13 | 2015-03-13 | Ultra-wideband elliptical monopole cylindrical conformal antennas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520154810.2U CN204538233U (en) | 2015-03-13 | 2015-03-13 | Ultra-wideband elliptical monopole cylindrical conformal antennas |
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| Publication Number | Publication Date |
|---|---|
| CN204538233U true CN204538233U (en) | 2015-08-05 |
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ID=53752197
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|---|---|---|---|
| CN201520154810.2U Expired - Fee Related CN204538233U (en) | 2015-03-13 | 2015-03-13 | Ultra-wideband elliptical monopole cylindrical conformal antennas |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104701614A (en) * | 2015-03-13 | 2015-06-10 | 吉林医药学院 | Ultra wide band elliptical monopole cylinder conformal antenna |
| US20170110799A1 (en) * | 2015-10-14 | 2017-04-20 | Cognitive Systems Corp. | Antenna Systems for Wireless Sensor Devices |
| CN106972251A (en) * | 2017-04-10 | 2017-07-21 | 合肥工业大学 | A kind of three trap conformal omnidirectional micro-strip array antennas |
| CN108390152A (en) * | 2018-04-22 | 2018-08-10 | 吉林医药学院 | A kind of elliptical ring combination three band planar slot antenna of shape |
| CN109728430A (en) * | 2019-01-15 | 2019-05-07 | 中国计量大学 | Two-band wearable antenna |
| CN110596464A (en) * | 2019-10-22 | 2019-12-20 | 中国电子科技集团公司信息科学研究院 | Electromagnetic parameter measuring system and method |
-
2015
- 2015-03-13 CN CN201520154810.2U patent/CN204538233U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104701614A (en) * | 2015-03-13 | 2015-06-10 | 吉林医药学院 | Ultra wide band elliptical monopole cylinder conformal antenna |
| US20170110799A1 (en) * | 2015-10-14 | 2017-04-20 | Cognitive Systems Corp. | Antenna Systems for Wireless Sensor Devices |
| CN106972251A (en) * | 2017-04-10 | 2017-07-21 | 合肥工业大学 | A kind of three trap conformal omnidirectional micro-strip array antennas |
| CN106972251B (en) * | 2017-04-10 | 2019-04-23 | 合肥工业大学 | A kind of three trap conformal omnidirectional micro-strip array antennas |
| CN108390152A (en) * | 2018-04-22 | 2018-08-10 | 吉林医药学院 | A kind of elliptical ring combination three band planar slot antenna of shape |
| CN108390152B (en) * | 2018-04-22 | 2023-12-15 | 吉林医药学院 | Elliptical ring combined three-broadband planar slot antenna |
| CN109728430A (en) * | 2019-01-15 | 2019-05-07 | 中国计量大学 | Two-band wearable antenna |
| CN110596464A (en) * | 2019-10-22 | 2019-12-20 | 中国电子科技集团公司信息科学研究院 | Electromagnetic parameter measuring system and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150805 Termination date: 20160313 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |