CN204257817U - Based on the three frequency microstrip antenna of defect ground structure - Google Patents
Based on the three frequency microstrip antenna of defect ground structure Download PDFInfo
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- CN204257817U CN204257817U CN201420757602.7U CN201420757602U CN204257817U CN 204257817 U CN204257817 U CN 204257817U CN 201420757602 U CN201420757602 U CN 201420757602U CN 204257817 U CN204257817 U CN 204257817U
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Abstract
The utility model discloses a kind of three frequency microstrip antenna based on defect ground structure, include medium substrate, radiation patch and ground plate, radiation patch and ground plate are arranged symmetrically with along medium substrate center line, ground plate is in medium substrate lower rear, described radiation patch is by dodecagon ring paster, square loop paster, doubly-linked arrow paster and band paster are formed, medium substrate upper front is provided with dodecagon ring paster, the square loop paster having 45 ° to tilt in the inner ring of dodecagon ring paster, square loop paster inferior horn is overlapping with doubly-linked arrow paster top to be connected, band paster connects dodecagon ring paster downwards from the base of doubly-linked arrow paster, and extend to the edge of going to the bottom of medium substrate, an isosceles triangle blank block is had in the middle part of described ground plate, there is circular arc convex closure top.Technique effect of the present utility model is: can reduce return loss, add the beamwidth of antenna, and antenna has three working frequency range, can meet RFID, WLAN and WiMAX technical field and use.
Description
Technical field
The utility model relates to antenna technical field, is specifically related to a kind of microstrip antenna.
Background technology
Defect ground structure (DGS:Defected Ground Structure) is one of hot technology of microwave regime newly-developed, and it is developed by photonic band gap structure (PBG).This structure, by etching cycle or aperiodicity figure on the transmission line ground planes such as microstrip line, changes the distribution of earth current, thus changes the frequency characteristic of transmission line, can realize exciting resonance frequency, harmonic inhabitation, increases the effects such as bandwidth.Defect grounding structure has in microwave circuit and Antenna Design to be applied very widely.
Microstrip antenna has that quality is light, volume is little, be easy to the advantages such as making.But common microstrip antenna stock size is comparatively large, frequency band is narrower, loss is higher.For this reason, microstrip antenna haves much room for improvement in reduction return loss, the increase beamwidth of antenna and reduction physical dimension etc.
Utility model content
For the deficiency of existing microstrip antenna, technical problem to be solved in the utility model is just to provide a kind of three frequency microstrip antenna based on defect ground structure, it can reduce return loss, increases the beamwidth of antenna, can meet three working frequency range that RFID, WLAN and WiMAX technical field uses.
Technical problem to be solved in the utility model is realized by such technical scheme, it includes medium substrate, radiation patch and ground plate, radiation patch and ground plate are arranged symmetrically with along medium substrate center line, ground plate is in medium substrate lower rear, described radiation patch is by dodecagon ring paster, square loop paster, doubly-linked arrow paster and band paster are formed, medium substrate upper front is provided with dodecagon ring paster, the square loop paster having 45 ° to tilt in the inner ring of dodecagon ring paster, square loop paster inferior horn is overlapping with doubly-linked arrow paster top to be connected, band paster connects dodecagon ring paster downwards from the base of doubly-linked arrow paster, and extend to the edge of going to the bottom of medium substrate, an isosceles triangle blank block is had in the middle part of described ground plate, there is circular arc convex closure top.
Medium substrate is epoxy resin board (FR4), relative dielectric constant ε r=4.4, and dielectric loss is 0.02.Band paster is feeding transmission line, and characteristic impedance is 50 Ω.
Technique effect of the present utility model is: can reduce return loss, add the beamwidth of antenna, and antenna has three working frequency range, can meet RFID, WLAN and WiMAX technical field and use.
Accompanying drawing explanation
Accompanying drawing of the present utility model is described as follows:
Fig. 1 is front elevation of the present utility model;
Fig. 2 is back view of the present utility model;
Fig. 3 is microstrip antenna structure design process figure;
Fig. 3 a is the tow sides merging figure of antenna I;
Fig. 3 b is the tow sides merging figure of antenna II;
Fig. 3 c is tow sides merging figure of the present utility model;
The return loss plot of Fig. 4 corresponding to kind of the antenna of three in Fig. 3;
Fig. 5 is E face when 2.45GHz of the antenna of embodiment and H surface radiation directional diagram;
Fig. 6 is E face when 3.5 GHz of the antenna of embodiment and H surface radiation directional diagram;
Fig. 7 is E face when 5.5 GHz of the antenna of embodiment and H surface radiation directional diagram.
In figure: 1. medium substrate; 2. ground plate; 3. dodecagon ring paster; 4. square loop paster; 5. doubly-linked arrow paster; 6. band paster; I. the return loss plot of antenna I; J. the return loss plot of antenna II; K. return loss plot of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail:
As depicted in figs. 1 and 2, the utility model includes medium substrate 1, radiation patch and ground plate 2, radiation patch and ground plate are arranged symmetrically with along medium substrate center line, ground plate 2 is in medium substrate 1 lower rear, described radiation patch is by dodecagon ring paster 3, square loop paster 4, doubly-linked arrow paster 5 and band paster 6 are formed, medium substrate 1 upper front is provided with dodecagon ring paster 3, the square loop paster 4 having 45 ° to tilt in the inner ring of dodecagon ring paster 3, square loop paster 4 inferior horn is overlapping with doubly-linked arrow paster 5 top to be connected, band paster 6 connects dodecagon ring paster 3 downwards from the base of doubly-linked arrow paster 5, and extend to the edge of going to the bottom of medium substrate 1, an isosceles triangle blank block is had in the middle part of described ground plate 2, there is circular arc convex closure top.
Fig. 3 is microstrip antenna structure design process figure; Fig. 3 a is the tow sides merging figure of antenna I, and antenna I is the antenna structure of initial designs, and it comprises dodecagon ring paster
,rectangle floor and band paster, band paster extends the edge of going to the bottom of medium substrate from dodecagon ring radiation patch inferior horn.Radiating element is by after sub-miniature A connector feed, electric current flows through band paster until dodecagon ring paster top from distributing point, the path length that this electric current flows through is 42.21mm, now Antenna Operation is a frequency range, but return wave loss parameter is bad, any one working frequency range of RFID, WLAN and WiMAX technical field can not be covered.
Fig. 3 b is the tow sides merging figure of antenna II, antenna II is on the antenna I basis shown in Fig. 3 a, 45 ° of square loop pasters tilted and doubly-linked arrow paster is increased in dodecagon ring paster inside, square loop paster inferior horn connects doubly-linked arrow paster top, band paster extends upwardly the base to doubly-linked arrow paster, the resonance frequency that antenna I inspires disappears and another resonance frequency is excited out, now electric current flows through band paster and doubly-linked arrow paster until square loop paster top from distributing point, the path length that this electric current flows through is 31mm, obtain a wavelength coverage near RFID 2.4GHz working frequency range.
In order to obtain three working frequency range, improve the working frequency range obtained above, tow sides as shown in Figure 3 c merge figure, rectangle floor have employed the defect floor panel structure of isosceles triangle and circular arc convex closure, a=3.2mm at the bottom of defect triangle, high b=3mm simultaneously.The size of triangle defect and position have impact on resonance frequency and the impedance bandwidth of antenna to a certain extent.By the correct position etching triangle defect at circular arc convex closure defect ground structure, emulation finds that broader bandwidth has appearred three frequency ranges and in antenna altogether, and coupling is better, because defect ground structure can excite and improve resonance frequency.Now electric current flows through band paster until doubly-linked arrow paster bottom from distributing point, and the path length that this electric current flows through is 13mm, due to defect ground structure, changes frequency characteristic herein, thus obtains three frequency ranges.Like this, the antenna covering RFID, WLAN and WiMAX working frequency range is obtained when not increasing overall volume.
Use the return wave loss parameter of network analyzer to antenna to test, the return loss plot of three kinds of antennas is as shown in Fig. 4.In Fig. 4, curve i is the return loss plot of antenna I, is found out by curve i: it is 4.77 ~ 5.07GHz that antenna I is operated in a working frequency range, and resonance frequency is respectively 4.93 GHz, and the return loss of antenna at resonance point place is-14.54dB.In Fig. 4, curve j is the return loss plot of antenna II, is found out by curve j: the working frequency range of antenna II is 2.32 ~ 2.41GHz, and resonance frequency is 2.37GHz, and the return loss of antenna at resonance point place is-11.38dB.In Fig. 3, curve k is return loss plot of the present utility model, is found out by curve k: the utility model Antenna Operation frequency range is respectively 2.4 ~ 2.5GHz, 3.16 ~ 4.1GHZ and 4.96 ~ 6.24GHz, and resonance frequency is respectively 2.46GHz, 3.43GHz and 5.8GHz.The utility model antenna is respectively-23.07dB in the return loss at resonance point place, and-40.21dB and-33.02dB, compare antenna I and antenna II, return loss is very low, demonstrates the matching properties that antenna is good.
Embodiment
See Fig. 1, medium substrate length L=34mm, width W=25mm, thickness of slab 0.8mm.
Application Frequency Simulation Software HFSS carries out simulation calculation and optimal design to different antennae structural parameters, obtains following physical dimension:
See Fig. 1, the outer shroud circumradius R2=11mm of dodecagon ring paster, inner ring circumradius R1=9.8mm, the outer shroud circumscribed circle center of circle is higher than the distance N3=0.1mm in the inner ring circumscribed circle center of circle; The outer shroud circumradius R3=3.7mm of square loop paster, inner ring circumradius R4=2mm, the length L1=23mm of center to the medium substrate bottom of square loop paster; The length N4=7.5mm on doubly-linked arrow paster top to doubly-linked arrow paster base, doubly-linked arrow paster bottom side length W1=5.2mm, an arrow summit in doubly-linked arrow paster is to the height N1=4.5mm on arrow base; The square loop paster inferior horn length N2=1.2mm that connect overlapping with doubly-linked arrow paster top;
The width W f=1.5mm of band paster, from dodecagon ring paster outer shroud to the tape leaf length Lf=10.4mm of medium substrate bottom.
See Fig. 2, rectangular block width W=the 25mm of ground plate, height L2=5mm, the bottom side length a=3.2mm of isosceles triangle blank block, height b=3mm, the base of isosceles triangle blank block is to the distance L3=3.7mm of medium substrate bottom, and the base mid point of isosceles triangle blank block offsets medium substrate center line 0.44mm left, the radius R 5=10.95mm of circular arc convex closure, the intersection point of circular arc convex closure and rectangular block is to the distance W2=3.34mm of medium substrate side.
The E face of the antenna that Fig. 5, Fig. 6, Fig. 7 are respectively the present embodiment when 2.45GHz, 3.5 GHz, 5.5 GHz and H surface radiation directional diagram.Find out from Fig. 5, Fig. 6, Fig. 7: the pattern characteristics of the antenna of the present embodiment is relatively stable in 2.4 ~ 2.5GHz, 3.16 ~ 4.1GHZ and 4.96 ~ 6.24GHz working frequency range, has good directivity.So the utility model antenna is provided with three working frequency range, RFID, WLAN and WiMAX technical field can be met and use.
Claims (7)
1. based on the three frequency microstrip antenna of defect ground structure, include medium substrate (1), radiation patch and ground plate (2), radiation patch and ground plate are arranged symmetrically with along medium substrate center line, ground plate (2) is in medium substrate (1) lower rear, it is characterized in that: described radiation patch is by dodecagon ring paster (3), square loop paster (4), doubly-linked arrow paster (5) and band paster (6) are formed, medium substrate (1) upper front is provided with dodecagon ring paster (3), the square loop paster (4) having 45 ° to tilt in the inner ring of dodecagon ring paster (3), square loop paster (4) inferior horn is overlapping with doubly-linked arrow paster (5) top to be connected, band paster (6) connects dodecagon ring paster (3) downwards from the base of doubly-linked arrow paster (5), and extend to the edge of going to the bottom of medium substrate (1), there is an isosceles triangle blank block at described ground plate (2) middle part, there is circular arc convex closure top.
2. the three frequency microstrip antenna based on defect ground structure according to claim 1, is characterized in that: the length L=37mm of described medium substrate (1), width W=25mm, thickness 0.8mm.
3. the three frequency microstrip antenna based on defect ground structure according to claim 2, it is characterized in that: the outer shroud circumradius R2=11mm of described dodecagon ring paster (3), inner ring circumradius R1=9.8mm, the outer shroud circumscribed circle center of circle is higher than the distance N3=0.1mm in the inner ring circumscribed circle center of circle.
4. the three frequency microstrip antenna based on defect ground structure according to claim 3, it is characterized in that: the outer shroud circumradius R3=3.7mm of described square loop paster (4), inner ring circumradius R4=2mm, the length L1=23mm of center to the medium substrate bottom of square loop paster.
5. the three frequency microstrip antenna based on defect ground structure according to claim 4, it is characterized in that: the length N4=7.5mm on described doubly-linked arrow paster (5) top to doubly-linked arrow paster base, doubly-linked arrow paster (5) bottom side length W1=5.2mm, an arrow summit in doubly-linked arrow paster (5) is to the height N1=4.5mm on arrow base; Square loop paster (4) the inferior horn length N2=1.2mm that connect overlapping with doubly-linked arrow paster (5) top.
6. the three frequency microstrip antenna based on defect ground structure according to claim 5, it is characterized in that: the rectangular block width W=25mm of described ground plate (2), height L2=5mm, the bottom side length a=3.2mm of isosceles triangle blank block, height b=3mm, the base of isosceles triangle blank block is to the distance L3=3.7mm of medium substrate bottom, the base mid point of isosceles triangle blank block offsets medium substrate center line 0.44mm left, the radius R 5=10.95mm of circular arc convex closure, the intersection point of circular arc convex closure and rectangular block is to the distance W2=3.34mm of medium substrate side.
7. the three frequency microstrip antenna based on defect ground structure according to claim 6, is characterized in that: the width W f=1.5mm of described band paster (6), from dodecagon ring paster outer shroud to the tape leaf length Lf=10.4mm of medium substrate bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420757602.7U CN204257817U (en) | 2014-12-05 | 2014-12-05 | Based on the three frequency microstrip antenna of defect ground structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420757602.7U CN204257817U (en) | 2014-12-05 | 2014-12-05 | Based on the three frequency microstrip antenna of defect ground structure |
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| CN204257817U true CN204257817U (en) | 2015-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420757602.7U Expired - Fee Related CN204257817U (en) | 2014-12-05 | 2014-12-05 | Based on the three frequency microstrip antenna of defect ground structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106299642A (en) * | 2016-08-09 | 2017-01-04 | 京信通信***（中国）有限公司 | Antenna radiator structure and paster antenna thereof |
| CN107623185A (en) * | 2017-09-30 | 2018-01-23 | 重庆三峡学院 | A kind of the frequency reconstructable microstrip aerial of rectangular ring five and communication device |
| CN107658550A (en) * | 2017-09-30 | 2018-02-02 | 重庆三峡学院 | A kind of the frequency reconstructable microstrip aerial of elliptical annular four and communication device |
-
2014
- 2014-12-05 CN CN201420757602.7U patent/CN204257817U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106299642A (en) * | 2016-08-09 | 2017-01-04 | 京信通信***（中国）有限公司 | Antenna radiator structure and paster antenna thereof |
| CN107623185A (en) * | 2017-09-30 | 2018-01-23 | 重庆三峡学院 | A kind of the frequency reconstructable microstrip aerial of rectangular ring five and communication device |
| CN107658550A (en) * | 2017-09-30 | 2018-02-02 | 重庆三峡学院 | A kind of the frequency reconstructable microstrip aerial of elliptical annular four and communication device |
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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: 20150408 Termination date: 20151205 |
|
| EXPY | Termination of patent right or utility model |