CN106816701A - Double frequency round polarized microstrip antenna - Google Patents
Double frequency round polarized microstrip antenna Download PDFInfo
- Publication number
- CN106816701A CN106816701A CN201710028373.3A CN201710028373A CN106816701A CN 106816701 A CN106816701 A CN 106816701A CN 201710028373 A CN201710028373 A CN 201710028373A CN 106816701 A CN106816701 A CN 106816701A
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- microstrip line
- antenna
- medium substrate
- width
- circular arc
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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
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/24—Polarising devices; Polarisation filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/10—Resonant antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
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Abstract
The invention discloses a kind of double frequency round polarized microstrip antenna, mainly solve the problems, such as that double frequency round polarized microstrip antenna impedance coupling bandwidth, axial ratio bandwidth are narrower and physical dimension is larger in the prior art.The dual-band antenna includes antenna radiation unit (1), medium substrate (2), metal floor (3), antenna radiation unit and metal floor are respectively positioned at the above and below of medium substrate, and be connected with the sub-miniature A connector (4) for being arranged on medium substrate bottom, antenna radiation unit is connected and composed by impedance matching microstrip line (11), circular arc microstrip line (12), "T"-shaped microstrip line (13) and " L " shaped microstrip line (14), and its "T"-shaped microstrip line and " L " shaped microstrip line are respectively used to that control antenna is low, high band radiation characteristic.Experiment shows that impedance of the invention and axial ratio bandwidth can meet the demand of WLAN WLAN, in can be applied to modern wireless communication systems and satellite navigation and location system.
Description
Technical field
Further it is to be related to a kind of double frequency round polarized microstrip antenna the invention belongs to communication technical field, can be used for nothing
Limit LAN WLAN.
Background technology
WLAN WLAN is one of current maximally effective Radio Access Network, and WLAN has been seen as channel radio
The important component of letter technology.And wireless communication system typically requires that equipment being capable of rapidly and efficiently reliable bidirectional transmit-receive number
According to, be reflected on antenna subsystem, that is, require antenna element energy small multi-frequency wideband operation, and simple structure, easily and channel radio
Letter integration of equipments.Compared with linear polarized antenna, circular polarized antenna can receive the electromagnetic wave of any polarization and effective reduction
The influence of multipath reaction.Microstrip antenna with its have small volume, lightweight, low cost, can it is conformal with carrier, easily form circular polarisation
The features such as, therefore be widely used in antenna with microwave integrated circuit.
The most narrower bandwidth of double frequency round polarized microstrip antenna traditional at present, size is larger, is unfavorable for processing and measures, and
Relatively costly, it is impossible to be applied to the cordless communication network in modern times well, application prospect is limited.In recent years, increasing day
Energy has been placed on the expansion beamwidth of antenna, has realized the miniaturization of antenna, improves polarization characteristic and realize two-band work by line designer
On work, for example：
A kind of patent " dual-band antenna " (application number of ZTE Co., Ltd's application：201210246606.4, it is public
The number of opening：CN 102780081A) in propose a kind of broad-band antenna that double frequency WLAN frequency ranges are realized by zigzag Microstrip line, the day
Line has bandwidth of operation very wide.The dual-band antenna is still present following shortcoming：Antenna can not realize circular polarization radiation, with other
Polarization loss can be produced in the communication process of poliarizing antenna, energy loss is caused, thus is subject to during application in the field of communications
Limitation.
Document " W.Liang, Y.C.Jiao, Y.Luan, and C.Tian, A dual-band circularly
polarized complementary antenna,IEEE Antenna Wireless Propag.Lett.,vol.14,
A kind of compact conformation is described in pp.1153-1156,2015. ", the double frequency round polarized micro-strip day of cordless communication network is served
Line, by the tortuous minor matters and the collective effect of folded monopole sub-antenna that are attached on metal floor, realizes in frequency range 2.3-
The circular polarisation spoke in two-frequency operation and frequency range 2.39-2.43GHz and 5.06-5.70GHz in 2.7GHz and 4.8-6.8GHz
Penetrate, circular polarisation is functional, but the shortcoming of the double frequency round polarized antenna is quite narrower axial ratio bandwidth, it is impossible to cover WLAN's
5.70-5.825GHz frequency ranges.
Document " Xiu Longbao and M.J.Amman, Dual-Frequency Dual-Sense Circularly-
Polarized Slot Antenna Fed by Microstrip Line,IEEE Transactions on Antennas
A kind of double frequency round polarized microstrip antenna is described in and Propagation, vol.56, pp.645-649,2008. ", under
Surface microstrip lines feed realizes double frequency round polarized spoke to the method in the different cross-shaped gap of upper surface length
Penetrate, circular polarization radiation effect is preferable, but the deficiency that the double frequency round polarized antenna is present is larger size, it is impossible to better meet small
The use requirement of type.
The content of the invention
Deficiency it is an object of the invention to be directed to above-mentioned prior art, proposes a kind of double frequency round polarized microstrip antenna, with
Reduce antenna structure size, broadened bandwidth, realization obtains good in wireless communication frequency band 2.4-2.5GHz and 5.15-5.85GHz
Good dual frequency radiation characteristic.
In order to reach above-mentioned technical purpose, double frequency round polarized microstrip antenna of the invention, including antenna radiation unit, medium
Substrate and metal floor, antenna radiation unit and metal floor respectively positioned at medium substrate upper and lower surface, and be arranged on Jie
The sub-miniature A connector of matter base plate bottom is connected, it is characterised in that：
The antenna radiation unit, including impedance matching microstrip line, circular arc microstrip line, "T"-shaped microstrip line and " L " shape are micro-
Band line；
The impedance matching microstrip line be located at medium substrate front bottom edge, and with the lower end of circular arc microstrip line
Connection；
The "T"-shaped microstrip line is located at the edge at the top of medium substrate front, and is connected with the upper end of circular arc microstrip line；
It is somebody's turn to do " L " shaped microstrip line and is located at the positive upper end of medium substrate, and is connected with the inside of circular arc microstrip line.
Further, the total length of the "T"-shaped microstrip line is first level micro-strip line length L3 microstrip lines vertical with first
Length L4 sums, its value is equal to centre frequency corresponding wavelength λ in low-frequency range1A quarter.
Further, the total length of described " L " shaped microstrip line is the second horizontal micro-strip line length L5 microstrip lines vertical with second
Length L6 sums, its value is equal to centre frequency corresponding wavelength λ in high band2A quarter.
Further, the impedance matching microstrip line be vertically to be connected by the two sections long different rectangular microstrip lines of width and
Into, and the width W2 of the rectangular microstrip line of upper end and the width W3 of circular arc microstrip line are equal, the rectangular microstrip line width of lower end
Spans of the W1 more than rectangular microstrip the line width W2, width W1 of upper end is 4mm~6mm, the span of width W2 and W3
It is 2.5mm~3.5mm.
Further, the excursion of the arc chord angle α of the circular arc microstrip line is pi/2~π.
The present invention has advantages below compared with prior art：
1. the present invention overcomes double frequency in the prior art due to being provided with impedance matching microstrip line inside antenna radiation unit
The problem of circular polarization microstrip antenna impedance matching narrower bandwidth, increases the impedance matching bandwidth of the high and low frequency range of dual-band antenna.
2. the present invention has passed through "T"-shaped microstrip line and " L " shaped microstrip line controls that antenna is low, high band circular polarization radiation respectively
Characteristic, overcome the narrower problem of double frequency round polarized microstrip antenna axial ratio bandwidth in the prior art, improve antenna two-band
Axial ratio bandwidth, has reached good circular polarization radiation effect.
3. the present invention passes through the one of impedance matching microstrip line, circular arc microstrip line, "T"-shaped microstrip line and " L " shaped microstrip line
Body structure design, reduces the physical dimension of antenna radiation unit, overcomes traditional double frequency round polarized microstrip antenna size
Larger problem, realizes the miniaturization of double frequency round polarized microstrip antenna.
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Fig. 2 is the side view of Fig. 1；
Fig. 3 is the physical dimension mark figure in the embodiment of the present invention；
Fig. 4 is embodiment of the present invention voltage standing wave ratio simulation result figure；
Fig. 5 is the axle of the embodiment of the present invention than simulation result figure.
Specific implementation method
Below in conjunction with accompanying drawing and case study on implementation, the present invention is described in further detail：
1~Fig. 3 of reference picture, double frequency round polarized antenna of the invention includes antenna radiation unit 1, medium substrate 2, metal ground
Plate 3 and sub-miniature A connector 4.
Antenna radiation unit 1 is located at the left side of the center of medium substrate 2, its with medium substrate right side edge at distance
D is 25mm~30mm.Antenna radiation unit 1 is by impedance matching microstrip line 11, circular arc microstrip line 12, "T"-shaped microstrip line 13
" L " shaped microstrip line 14 is sequentially connected and constitutes, and the upper surface of medium substrate 2 is etched in by the method for photoetching corrosion.So
Design reduce the physical dimension of antenna radiation unit 1, reached the purpose of miniaturization of the present invention.Distance in the present embodiment
D values are 27mm, and its value can also be adjusted than the requirement of frequency band according to axle in its span, but be not limited to this reality
Apply example.
The impedance matching microstrip line 11, its edge for being located at the front bottom of medium substrate 2, and with circular arc microstrip line
12 lower end is in contact.The impedance matching microstrip line 11 is the layout with the material of medium substrate 2 and antenna radiation unit 1 as base
Plinth is designed, and it is vertically formed by connecting by two rectangular microstrip lines of different sizes, wherein upper end rectangular microstrip line
Length L1 be 6mm~6.5mm, width W1 is 4mm~6mm, and the length L2 of lower end rectangular microstrip line is 12mm~14mm, width
W2 is 2.5mm~3.5mm, and W1 ＞ W2.Impedance matching microstrip line 11 is welded to each other with sub-miniature A connector 4, and it functions as antenna
The front end of radiating element 1 is fed, this configuration simplifies the feed structure of antenna, while broadening antenna impedance bandwidth
The axle ratio characteristic of antenna is not influenceed.In the present embodiment, length L1 values are 6mm, and width W1 values are 5mm, length L2 values
It is 13mm, width W2 values are 3mm, and the size of its value can be adjusted according to the size of input impedance in practical application, but
It is not limited to the present embodiment.
The circular arc microstrip line 12, it is located at the positive upside of medium substrate 2, and line width W3 is 2.5mm~3.5mm, and
W3=W2.The excursion of arc angle α is pi/2~π.The Main Function of the circular arc microstrip line 12 is the impedance for connecting lower end
The "T"-shaped microstrip line 13 and " L " shaped microstrip line 14 of matching microstrip line 11 and left end.In the present embodiment, line width W3 values are
3mm, angle [alpha] value is 3 π/4, but is not limited to the present embodiment.
The "T"-shaped microstrip line 13, by a segment length be L3, width for W4 horizontal microstrip line and a segment length be L4,
Width is formed by connecting for the vertical microstrip line of W4, its Main Function be control antenna in WLAN 2.4-2.4825GHz frequently
Radiation characteristic in section.Horizontal length L3 and the total length that vertical length L4 sums are the "T"-shaped microstrip line, its value can be according to micro-
Resonance principle with line is defined as a quarter of low-frequency range centre frequency resonance wavelength 1.The size of W4 is adjusted, can be effective
Broadening antenna low-frequency range impedance bandwidth, control "T"-shaped microstrip line 13 horizontal length L3 and vertical length L4 ratios it is big
It is small, the scope of antenna low-frequency range axial ratio bandwidth can be adjusted.Due in "T"-shaped microstrip line resonance in an embodiment of the present invention
Frequency of heart is 2.44GHz, so in the present embodiment, length L3 values are 18.6mm, length L4 values are 12mm, and width W4 takes
Value 3mm, its value is not limited to the present embodiment.
" L " the shaped microstrip line 14 is one section of folding microstrip line, for controlling antenna in WLAN 5.15-
Radiation characteristic in 5.825GHz frequency ranges, its width is W5, and length is horizontal length L5 and vertical length L6 sums, and its value can root
It is defined as a quarter of high band centre frequency resonance wavelength 2 according to the resonance principle of microstrip line.The size of adjustment width W5,
It is capable of the size of the impedance bandwidth of effective broadening antenna high band, control lateral length L5 and longitudinal length L6 ratios, can be with
Scope of the adjustment antenna in high band axial ratio bandwidth.The determination of L5 and L6 length can make adjustment with reference to simulation result.Due to
In embodiments of the invention, the centre frequency of " L " shaped microstrip line resonance is 5.49GHz, so in the present embodiment, length L5 takes
It is 7.8mm to be worth, and length L6 values are 7.8mm, and width W5 values are 2.2mm, and its value is not limited to the present embodiment.
The medium substrate 2, its length S1 be 48mm~50mm, width be 42mm~45mm, height H for 1.4mm~
2mm.Length S1 values are 49mm in the present embodiment, and the value of width S 2 is 43mm, and height H values are 1.5mm, but its value not office
It is limited to the present embodiment.The material of the medium substrate 2 is polytetrafluoroethylene (PTFE), and dielectric constant is 2.65, and loss tangent angle is 0.003.
Because the loss of selected material is smaller, the energy loss of radiating element is reduced, ensureing the basis of overall dimensions miniaturization
On, improve the radiation efficiency and service behaviour of antenna.
The metal floor 3 is one layer of rectangular metal sheet, and reference ground is made for the impedance matching for antenna radiation unit 1.
Its length S3 is 48mm~50mm, and S3=S1, width S 4 is 14mm~15mm, is engraved in the lower surface of medium substrate.S3 and
The size of S4 values is the structure according to antenna radiation unit determines size, and in the present embodiment, length S3 values are
49mm, the value of width S 4 is 14.6mm, but is not limited to the present embodiment.
The sub-miniature A connector 4, positioned at the bottom of medium substrate 2, its input impedance is 50 Ω.The sub-miniature A connector 4 is used to connect
The antenna radiation unit 1 of upper surface and the metal floor 3 of lower surface, and as test interface.
Effect of the invention can be further illustrated by following emulation experiment, and its emulation tool is electromagnetic software Ansoft
HFSS 15。
Emulation experiment 1, the two-band voltage standing wave ratio to the embodiment of the present invention is emulated.Result such as Fig. 4, wherein Fig. 4 a
It is the voltage standing wave ratio simulation result figure of low-frequency range, Fig. 4 b are the voltage standing wave ratio simulation result figure of high band.
Frequency band range of the voltage standing wave ratio of antenna low-frequency range below 2 is can be seen that for 2.35-2.59GHz from Fig. 4 a,
Illustrate that the present invention can be with normal work in this frequency range.By the highest frequency 2.59GHz's of the frequency range and low-limit frequency 2.35GHz
Difference can obtain the relative impedances band a width of 9.7% of low-frequency range of the present invention divided by its centre frequency 2.47GHz.
It is seen from fig. 4b that in the band limits of 3.84-6.64GHz, the voltage standing wave ratio of antenna is less than 2, represents
The present invention can be with normal work in this frequency range.The highest frequency 6.64GHz of the frequency range is removed with the difference of low-limit frequency 3.84GHz
With its centre frequency 5.24GHz, the relative impedances band a width of 53.4% of high band of the present invention can be obtained.
Emulation experiment 2, the two-band axle ratio to the embodiment of the present invention is emulated.Result such as Fig. 5, wherein Fig. 5 a are low frequency
The axle of section is the axle of high band than simulation result figure than simulation result figure, Fig. 5 b.
The axle that antenna low-frequency range is can be seen that from Fig. 5 a is 2.25-2.56GHz, explanation than the band limits in below 3dB
The present invention has good circular polarization radiation characteristic in this frequency range.By the highest frequency 2.56GHz and low-limit frequency of the frequency range
The difference of 2.25GHz is 12.9% divided by its centre frequency 2.405GHz, the relative axial ratio bandwidth that can obtain low-frequency range of the present invention.
Be can be seen that in the band limits of 3.9-6.4GHz from Fig. 5 b, the axle ratio of antenna is less than 3dB, represents the present invention
There is good circular polarization radiation characteristic in this frequency range.By the highest frequency 6.4GHz's of the frequency range and low-limit frequency 3.9GHz
Difference is 48.5% divided by its centre frequency 5.15GHz, the relative axial ratio bandwidth that can obtain high band of the present invention.
Can be seen that working frequency range of the invention and axle by the result of above-mentioned emulation experiment can completely cover than frequency range
Two frequency ranges of 2.4-2.4825GHz and 5.15-5.825GHz of lid wireless local area WLAN, meet modern wireless communication systems
With the requirement of satellite navigation and location system.
Above is to example of the present invention, not constituting any limitation of the invention, for example, there is related parameter
Size selection can arbitrarily change in its adjustable extent, and these changes can be adjusted according to specific actual requirement, thus on
State the description of example should be considered as it is illustrative and not restrictive.Those skilled in the art is without departing substantially from of the invention former
On the premise of reason, structure, carry out the various amendments in form and parameter and change what is be all possible to, but these are based on this hair
The amendment and change of bright thought are still within claims of the invention.
Claims (7)
1. a kind of double frequency round polarized microstrip antenna, including antenna radiation unit (1), medium substrate (2) and metal floor (3), day
Beta radiation unit (1) and metal floor (3) respectively positioned at medium substrate (2) upper and lower surface, and be arranged on medium substrate
(2) sub-miniature A connector (4) of bottom is connected, it is characterised in that：
The antenna radiation unit (1), including impedance matching microstrip line (11), circular arc microstrip line (12), "T"-shaped microstrip line
And " L " shaped microstrip line (14) (13)；
The impedance matching microstrip line (11) positioned at the edge of the front bottom of medium substrate (2), and with circular arc microstrip line
(12) lower end connection；
The edge of the "T"-shaped microstrip line (13) at the top of medium substrate (2) front, and it is upper with circular arc microstrip line (12)
End connection；
" L " shaped microstrip line (14) is somebody's turn to do positioned at medium substrate (2) positive upper end, and is connected with the inner side of circular arc microstrip line (12)
Connect.
2. antenna according to claim 1, it is characterised in that：The total length of "T"-shaped microstrip line (13) is that first level is micro-
Strip length L3 micro-strip line length L4 sums vertical with first, its value is equal to four of centre frequency corresponding wavelength λ 1 in low-frequency range
/ mono-.
3. antenna according to claim 1, it is characterised in that：The total length of " L " shaped microstrip line (14) is that the second level is micro-
Strip length L5 micro-strip line length L6 sums vertical with second, its value is equal to four of centre frequency corresponding wavelength λ 2 in high band
/ mono-.
4. antenna according to claim 1, it is characterised in that：Impedance matching microstrip line (11) is different by two sections long width
Rectangular microstrip line is vertically formed by connecting, and width W2 and the circular arc microstrip line of the rectangular microstrip line of upper end width W3
It is equal, the span of the rectangular microstrip line width W1 of lower end more than rectangular microstrip the line width W2, width W1 of upper end for 4mm~
The span of 6mm, width W2 and W3 is 2.5mm~3.5mm.
5. antenna according to claim 1, it is characterised in that：The excursion of the arc chord angle α of circular arc microstrip line (12)
It is pi/2~π.
6. antenna according to claim 1, it is characterised in that：Antenna radiation unit (1) is positioned at medium substrate (2) along center
The left side of position, and with medium substrate (2) right side edge at apart from D be 25mm~30mm.
7. antenna according to claim 1, it is characterised in that：Medium substrate (2) uses polytetrafluoroethylene (PTFE) printed circuit board (PCB).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710028373.3A CN106816701A (en) | 2017-01-16 | 2017-01-16 | Double frequency round polarized microstrip antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710028373.3A CN106816701A (en) | 2017-01-16 | 2017-01-16 | Double frequency round polarized microstrip antenna |
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| Publication Number | Publication Date |
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| CN106816701A true CN106816701A (en) | 2017-06-09 |
Family
ID=59111159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710028373.3A Pending CN106816701A (en) | 2017-01-16 | 2017-01-16 | Double frequency round polarized microstrip antenna |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108461919A (en) * | 2018-02-26 | 2018-08-28 | 成都北斗天线工程技术有限公司 | A kind of multifrequency microstrip antenna and its impedance matching adjusting method |
| CN108649332A (en) * | 2018-04-23 | 2018-10-12 | 歌尔科技有限公司 | A kind of multifrequency microstrip antenna and electronic equipment |
| CN108899649A (en) * | 2018-07-09 | 2018-11-27 | 中国计量大学 | More folding oscillator circular polarized antennas |
| CN109088164A (en) * | 2018-08-21 | 2018-12-25 | 吉林医药学院 | A kind of gear annular slot double frequency round polarized antenna |
| CN109378580A (en) * | 2018-10-31 | 2019-02-22 | 华南理工大学 | A kind of double frequency round polarized monopole antenna having wide axial ratio bandwidth |
| CN109687126A (en) * | 2018-12-13 | 2019-04-26 | 东华大学 | A kind of circular polarization microstrip antenna of quasi- c-type structure |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108461919A (en) * | 2018-02-26 | 2018-08-28 | 成都北斗天线工程技术有限公司 | A kind of multifrequency microstrip antenna and its impedance matching adjusting method |
| CN108461919B (en) * | 2018-02-26 | 2023-07-21 | 成都北斗天线工程技术有限公司 | Multi-frequency microstrip antenna and impedance matching adjustment method thereof |
| CN108649332A (en) * | 2018-04-23 | 2018-10-12 | 歌尔科技有限公司 | A kind of multifrequency microstrip antenna and electronic equipment |
| CN108899649A (en) * | 2018-07-09 | 2018-11-27 | 中国计量大学 | More folding oscillator circular polarized antennas |
| CN109088164A (en) * | 2018-08-21 | 2018-12-25 | 吉林医药学院 | A kind of gear annular slot double frequency round polarized antenna |
| CN109088164B (en) * | 2018-08-21 | 2024-04-26 | 吉林医药学院 | Gear ring gap double-frequency circularly polarized antenna |
| CN109378580A (en) * | 2018-10-31 | 2019-02-22 | 华南理工大学 | A kind of double frequency round polarized monopole antenna having wide axial ratio bandwidth |
| CN109687126A (en) * | 2018-12-13 | 2019-04-26 | 东华大学 | A kind of circular polarization microstrip antenna of quasi- c-type structure |
| CN109687126B (en) * | 2018-12-13 | 2021-05-11 | 东华大学 | Circularly polarized microstrip antenna with quasi-C-shaped structure |
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