CN102394360A - Low-sidelobe circular polarized microstrip array antenna applied to electronic toll collection system - Google Patents
Low-sidelobe circular polarized microstrip array antenna applied to electronic toll collection system Download PDFInfo
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Abstract
The invention discloses a low-sidelobe circular polarized microstrip array antenna applied to an electronic toll collection (ETC) system, wherein the antenna is has a three-layer structure successively including a metal foil, a dielectric substrate and a metal foil. A microstrip feed network and radiation units are arranged on the metal foil on the top of the structure; the radiation units employs a grouping mode in which n radiation units are arranged transversely and two radiation units are arranged longitudinally. There is a rotation angle difference of 90 degrees anticlockwise between each of the radiation unit above the longitudinal column and each of the radiation unit below the longitudinal column; compared with a feed phase of the radiation unit below the longitudinal column, a feed phase of the radiation unit above the longitudinal column is delayed by 90 degrees; and magnitudes of the feed currents of the radiation units at the same longitudinal column are equal. A feed joint is utilized to realize application of current excitation on a whole microstrip feed network, so that the whole microstrip feed network applies currents on all the radiation units. A simplified dolph-chebyshev distribution is utilized for current magnitude ratios that are needed by the radiation units on a same transverse line; and current phases are equal. According to the invention, the microstrip antenna has advantages of low axial ratio, low sidelobe and high gain; and moreover, the antenna is easy to process and install; therefore, the provided antenna can be widely applied to the electric toll field and other related fields.
Description
Technical field
The invention belongs to contactless Fare Collection System field; Specifically; It is the low secondary lobe right-handed circular polarization micro-strip array antenna on a kind of roadside unit (RSU, Road-Side Unit) that is used in the electronic charging system without parking (ETC, Electronic Toll Collection).
Background technology
Electronic charging system without parking utilizes automatic vehicle identification (Automatic Vehicle Identification is called for short AVI) technology to accomplish the wireless data communication between vehicle and the charge station; Carry out the exchange of automatic vehicle identification and relevant charge data; Carry out the processing of charge data through computer network, the all-electronin Fare Collection System of charge automatically of realizing not stopping.
Electronic charging system without parking mainly is to work through not the contacting communication of RSU and board units (OBU, On-Board Unit).When using ETC, the car owner just without people's processing fee, also need not be stopped during through charge station as long as the OBU and the expense that prestores are installed on vehicle, and expense will be removed by bales catch from card.This Fare Collection System per car charge is consuming time less than two seconds, and the traffic capacity of its charge passage is 5 to 10 times of manual toll collection passage.
Electronic charging system without parking is state-of-the-art in the world at present Fare Collection System, is one of service function of intelligent transportation system.It is particularly suitable under the bridge of highway or heavy traffic, tunnel environment, using.The research of the electronic charging system without parking of China and enforcement has in recent years obtained certain progress.
Along with the extensive use at highway of the issue of Chinese high-velocity electrons charge standard GB/T20851 " electronic charging DSRC " and electronic charging system without parking technology, people are to the demands for higher performance of the core component antenna of the key component RSU of electronic charging system without parking.Because during electronic charging system without parking work; Do not hope that information that the RSU antenna launches received by the vehicle misconnection in other track or disturbed by the information that other track OBU sends; Make people have higher requirement to RSU antenna far-field pattern; Hope to reduce the size of far-field pattern sidelobe level, improve the Sidelobe Suppression ratio; When working in adverse circumstances such as rain, greasy weather gas when electronic charging system without parking, be to suppress to disturb, people also have higher requirement to the axial ratio of electronic charging system without parking antenna; When electronic charging system without parking is worked, need power concentration be transmitted into and formulate in the communication range, therefore the gain of electronic charging system without parking antenna is also had higher requirement.And existing antenna can not satisfy these requirements well simultaneously.
Summary of the invention
In order to address the above problem, the present invention's proposition can realize the low secondary lobe circularly polarization microstrip array antenna of a kind of electronic charging system without parking usefulness of low axial ratio, high-gain and the low side lobe performance of antenna far-field pattern.Antenna of the present invention comprises microstrip antenna plate and feed connection.The microstrip antenna plate is made up of double layer of metal paillon foil and one deck medium substrate, is provided with medium substrate between the double layer of metal paillon foil; Said medium substrate dielectric constant is 2.1～3.5, and loss angle is tan δ≤3 * 10
-3, thickness is less than 2mm.
Be positioned on the tinsel of top layer and comprise microstrip feed network and radiating element.Radiating element adopts individual, vertical two arrangement mode of horizontal n, forms the group formation formula (n >=5) of n * 2; Being centered close on the same horizontal line of n radiating element transversely, vertically last two radiating elements is centered close on the same vertical line; Radiating element is the right-handed circular polarization antenna; The radiating element of each file top is rotated counterclockwise 90 ° differential seat angle with respect to having between the radiating element below the file, and the radiating element current feed phase that is positioned at the file top postpones 90 ° with respect to the radiating element that is positioned at the file below; Through microstrip feed network two radiating elements that are positioned at same file are carried out the constant amplitude feed.
Said microstrip feed network is made up of microstrip feed line, by feed connection whole microstrip feed network is added the electric current excitation, makes whole microstrip feed network add electric current to each file radiating element; After being passed into electric current in the microstrip-fed networking and feeding from horizontal main feeder center; Be divided into n road electric current and be passed into the n bar by the quarter-wave feeder line that is parallel to each other respectively and divide in the feeder line, through every branch feeder line electric current is distributed to two radiating elements that are arranged in same file then; Simultaneously, be positioned at the long microstrip feed line length of radiating element increase by 1/4th electric waves of the relative below of radiating element of top in each file; Every branch feeder line all tilts clockwise, and every branch feeder line all and form 30 °～60 ° angle between main feeder makes the radiating element of vertical bisecting line both sides of main feeder symmetrical; For the radiating element that is positioned at the top in each file, divide feeder line by its feed of radiating element lower direction;
In the said structure,, obtain two the current amplitude ratios that radiating element fed of needed each minute feeder line in each file through controlling the impedance ratio of each quarter-wave feeder line and main feeder; The needed current amplitude ratio of radiating element on the same horizontal line adopts Dao Erfu-Chebyshev to distribute, and current phase equates.
Microstrip antenna of the present invention possesses the advantage of low axial ratio, low secondary lobe, high-gain simultaneously, has overcome the some shortcomings in the existing antenna.And the antenna working frequency range is 5.8GHz among the present invention, has met the international DSRC physical layer standard of GBT20851.1-2007.
The invention has the advantages that:
1, is rotated counterclockwise 90 ° through radiating element with respect to the radiating element below each file in the microstrip antenna of the present invention to each file top; And the radiating element current feed phase that is positioned at the file top postpones 90 ° with respect to the radiating element that is positioned at the file below, has reduced the microstrip antenna axial ratio thus;
2, the needed current amplitude ratio of radiating element that is positioned in the microstrip antenna of the present invention on the same horizontal line adopts Dao Erfu-Chebyshev's ratio to distribute; Current phase equates; The current amplitude of the radiating element on the same file equates, has reduced the sidelobe level of antenna far-field pattern;
3, the array of radiating element composition n * 2 in the microstrip antenna of the present invention has been realized high-gain, the needs of power concentration when satisfying communication in the electronic charging system without parking communication range.
Description of drawings
Fig. 1 is microstrip antenna plate structure front view among the present invention;
Fig. 2 is feed connection structural representation among the present invention;
Fig. 3 is microstrip antenna plate structure sectional side view among the present invention;
Fig. 4 is two radiative unit structure sketch mapes on the same file among the present invention;
Fig. 5 for the electromagnetic axial ratio of launching through two radiating elements after rotation and the phase compensation and radiating element on each file among the present invention with frequency change figure comparison diagram;
Fig. 6 is the process rotation on each file among the present invention and two radiating elements and the electromagnetic axial ratio directional diagram comparison diagram that radiating element is launched after the phase compensation;
Fig. 7 is microstrip feed network structural representation among the present invention;
Fig. 8 is the comparison diagram of microstrip antenna far-field pattern of the present invention emulation and measured curve;
Fig. 9 is the comparison diagram of microstrip antenna axial ratio of the present invention with frequency change figure emulation and test curve;
Figure 10 is the comparison diagram of microstrip antenna axial ratio Direction Pattern Simulation of the present invention and test curve.
Among the figure:
1-microstrip antenna plate 2-feed connection 3-microstrip feed network 4-radiating element
102-medium substrate 101-tinsel 301-main feeder 302-quarter-wave feeder line
303-divides feeder line
Embodiment
The present invention is that a kind of electronic charging system without parking is used low secondary lobe circularly polarization microstrip array antenna, like Fig. 1, shown in Figure 2, comprises microstrip antenna plate 1 and feed connection 2.Microstrip antenna plate 1 is made up of double layer of metal paillon foil 101 and one deck medium substrate 102, and as shown in Figure 3, wherein 101 of double layer of metal paillon foils are provided with medium substrate 102, and the three interfixes.Said medium substrate 102 is a polytetrafluoroethylglass glass cloth, and polytetrafluoroethylglass glass cloth is compared to ceramic wafer and epoxy plate, its dielectric constant less (2.1～3.5), less (tan δ≤3 * 10 of loss angle
-3), hardness is moderate, and loss is less.For reducing loss as far as possible, improve antenna gain, the dielectric constant of the medium substrate 102 that the present invention selects is 2.65, loss angle tan δ≤7 * 10
-4, thickness 0.8mm, the tinsel 101 of selection is a copper foil, thickness is 1Oz (about 35um is thick).
Wherein, be positioned at and comprise microstrip feed network 3 and radiating element 4 on the tinsel 101 of top layer.Microstrip feed network 3 is made on the tinsel 101 of top layer through etched mode with radiating element 4, adopts etched manufacture method to reduce production costs taking into account under the situation of machining accuracy, is convenient to scale-up.As shown in Figure 1, wherein, the radiating element 4 on the tinsel 101 of top layer adopts individual, vertical two arrangement mode of horizontal n, forms the group formation formula (n >=5) of n * 2; Being centered close on the same horizontal line of n radiating element 4 transversely, vertically last two radiating elements 4 is centered close on the same vertical line.Wherein, each radiating element 4 is the square chamfering circular polarization microstrip antenna of a single-point feedback paster, works in the 5.8GHz frequency.In order to be the lower right-handed circular polarization antenna of axial ratio with microstrip antenna designs, radiating element 4 is designed to the right-handed circular polarization antenna, as shown in Figure 4; And the radiating element 4 of each file top has 90 ° the differential seat angle that is rotated counterclockwise with respect to 4 of the radiating elements of each file below, and the current feed phase that will be positioned at the radiating element 4 of file top postpones 90 ° with respect to the current feed phase of the radiating element 4 that is positioned at the file below; Simultaneously, two radiating elements 4 that are positioned at same file through 3 pairs of microstrip feed networks carry out the constant amplitude feed.Thus, can effectively reduce the electromagnetic axial ratio of two right-handed circular polarization radiating element 4 emissions on the file.
The plane wave that the standard round poliarizing antenna sends is the standard round polarized electromagnetic wave, and axial ratio is 0dB, and the standard round polarized electromagnetic wave is electric field strength equal and opposite in direction, i.e. E on two orthogonal direction x, y direction
x=E
y, 90 ° of phase phasic differences.Yet the electromagnetic wave that the circular polarized antenna that actual design is made sends is E often
x≠ E
y, axial ratio is higher.For two radiating elements 4 on each file that constitutes microstrip antenna of the present invention; As shown in Figure 4, wherein, P1E and P2E are respectively the feed access point of two radiating elements 4; The current amplitude that P1E and P2E inspire equates that P2E postpones 90 ° than P1E current feed phase.Because the reflex of underlying metal paillon foil 101, make electromagnetic wave that two radiating elements 4 are inspired all along Z direction forward transmitted.
For the radiating element 4 that is positioned at the below in the file; Should launch along the right-handed circular polarization electromagnetic wave of Z direction forward transmitted, make its plural form electric field
be:
Wherein,
Be the unit vector of X, Y direction, E
x, E
yBe the electric field component of X, Y direction, β is a phase-shift constant,
Z is the distance of plane wave along Z direction forward transmitted.
For the radiating element 4 that is positioned at the top in the file; After postponing through 90 ° of rotations and 90 ° of current feed phases; Should launch equally along the right-handed circular polarization electromagnetic wave of Z direction forward transmitted, its plural form electric field
is:
Therefore, the electromagnetic wave total electric field along Z direction forward transmitted
of two radiating element emissions on the file is:
Can find out that thus two radiating elements, 4 emissions on each file are along the electromagnetic wave total electric field of Z direction forward transmitted
For component amplitude on x, two orthogonal directions of y equates that size is E
x+ jE
y, be the standard round polarized electromagnetic wave, and this electromagnetic wave rotation direction is dextrorotation.Compare with a radiating element 4, the electromagnetic axial ratio that two radiating elements 4 through after rotation and the phase compensation among the present invention on each file are launched keeps lower level at higher frequency band range, and is as shown in Figure 5; Among Fig. 4, make that dotted line and YOZ plane included angle are θ, the electromagnetic wave axial ratio of two radiating element 4 emissions is lower, as shown in Figure 6 in the scope that exposes thoroughly of angle θ.Therefore the present invention selects two radiating elements 4 through rotation and phase compensation as the group array elements, and selects the XOZ plane as plane, low secondary lobe far-field pattern place during the group battle array.
Microstrip feed network of the present invention 3 is as shown in Figure 7, is made up of microstrip feed line, adopts the mode of parallel connection to add the electric current excitation by 2 pairs of whole microstrip feed networks 3 of 50 ohm of SMA feed connection, makes two radiating elements 4 of 3 pairs of each files of whole microstrip feed network add electric current.After being passed into electric current in the microstrip-fed networking 3 and feeding from horizontal main feeder 301 centers; Be divided into n road electric current and be passed into the n bar by the quarter-wave feeder line 302 that is parallel to each other respectively and divide in the feeder line 303, through every branch feeder line 303 electric current is distributed to two radiating elements 4 that are arranged in same file then; Simultaneously; Radiating element 4 above being positioned in each file is the long microstrip feed line length of radiating element 4 increases, 1/4th electric waves of below relatively, and the radiating element 4 above promptly realizing being positioned in the file is the effect of 90 ° of phase delays of radiating element 4 increases of below relatively.Because there is mutual coupling effect in the level on the main feeder 301 to radiating element 4; In order to obtain the centrosymmetric far-field pattern of microstrip antenna; In the present invention: every branch feeder line 303 is all tilted clockwise; Every branch feeder line 303 all and 301 angles that form 30 °～60 ° of main feeder makes the radiating element 4 of vertical bisecting line both sides of main feeder 301 symmetrical thus.Through behind the simulation optimization, every branch feeder line 303 and 301 angles of main feeder are 45 ° among the present invention.For the radiating element 4 that is positioned at the top in each file, divide feeder line 303 from its feed of radiating element 4 lower directions, the mutual coupling effect between the microstrip feed line that reduces thus to be parallel to each other.
In the said structure,, obtain two the current amplitude ratios that radiating element 4 fed of needed every branch feeder line 303 in each file through controlling the impedance ratio of each quarter-wave feeder line 302 and main feeder 301.Radiating element 4 needed current amplitude ratios among the present invention on the same horizontal line adopt Dao Erfu-Chebyshev to distribute, and current phase equates that the radiating element 4 needed current amplitudes on the same ordinate equate.
Dao Erfu-Chebyshev distributes and can be described as: the n on the same straight line identical radiating element can be seen as n isotropic point source; The far-field pattern of the line array of n isotropic point source can be represented as N item finite Fourier series (when n is odd number;
is when n is even number;
); Chebyshev polynomials with suitable power is inferior are mated Fourier's multinomial, make it to generate the optimum amplitude distribution that secondary lobe equals specified level.
Specify through embodiment below:
The structure that has horizontal 6 radiating elements 4, vertical two radiating elements 4 on the tinsel of microstrip antenna top layer of the present invention is following to transversely 6 radiating elements, 4 needed current amplitude ratio calculation:
If the Sidelobe Suppression of theory demand 28dB ratio is converted into decimal format R with the Sidelobe Suppression ratio:
28dB＝20log
10R
R＝25.12
16x
0 5-20x
0 3+5x
0＝25.12
Solve x
0=1.323.Use
Represent with operating frequency, observed bearing and point source between the relevant intermediate variable of distance, the electric current that makes 6 isotropic point sources feed from left to right is I
2, I
1, I
0, I
0, I
1, I
2, then use the resultant field E of 6 isotopic point source battle arrays that 3 finite Fourier series represent to be:
Using power is the resultant field E that 5 Chebyshev polynomials are mated the point source array that 3 finite Fourier series represent:
Wherein, X is an intermediate variable, and
Separate this equation group, solve I
0=6.19, I
1=4.335, I
2=2.025
Therefore, 6 isotropic point sources on the same horizontal line are that the current amplitude ratio that 6 radiating elements 4 feed is:
I
2∶I
1∶I
0∶I
0∶I
1∶I
2＝2.025∶4.335∶6.19∶6.19∶4.335∶2.025＝1∶2.14∶3.05∶3.05∶2.14∶1
Divide the feeder line 303 total current ratio that two radiating elements 4 in each file are fed to round up each bar; The actual current ratio (promptly being applied to the current amplitude ratio of microstrip antenna of the present invention) that 6 radiating elements 4 on the final same horizontal line feed is as shown in table 1, and the current amplitude that two radiating elements 4 on the same file feed equates.Under the excitation of this kind current amplitude ratio, the Sidelobe Suppression ratio on the 2x6 antenna theory reaches 27.2dB:
Table 1
| I 2 | I 1 | I 0 | I 0 | I 1 | I 2 |
| 1 | 2 | 3 | 3 | 2 | 1 |
For whole microstrip antenna, test with actual through emulation: when working in 5.8GHz, the comparison diagram of microstrip antenna far-field pattern of the present invention emulation and measured curve; As shown in Figure 8; By finding out that microstrip antenna secondary lobe of the present invention is lower among the figure, Sidelobe Suppression is than being 25.1dB, and gaining is 15.5dB; Microstrip antenna axial ratio of the present invention is with the comparison diagram of frequency change figure emulation and test curve; As shown in Figure 9; By finding out that microstrip antenna axial ratio of the present invention works in 5.8GHz when minimum among the figure; Minimum axial ratio value is 0.76dB, and the 3dB axial ratio bandwidth is 320MHz, has realized the low axial ratio performance in the wider frequency range; When working in 5.8GHz; The comparison diagram of microstrip antenna axial ratio Direction Pattern Simulation of the present invention and test curve; Shown in figure 10, by finding out that microstrip antenna maximum gain direction axial ratio of the present invention is 0.76dB, cross polarization discrimination 27.18dB among the figure; Axial ratio is lower than 3dB in θ is-18.5 °～24.5 ° scopes, can realize the performance of low axial ratio in the broad θ angular range.
This shows that microstrip antenna of the present invention possesses the advantage of low secondary lobe, low axial ratio, high-gain simultaneously, has overcome the some shortcomings in the existing antenna.And antenna works in 5.8GHz among the present invention, has met the international DSRC physical layer standard of GBT20851.1-2007.
For realizing ETC charge function, this antenna is made two, respectively as the sending and receiving antenna.The sending and receiving antenna is installed on same base plate through fixing hole, and back side SMA port connects cable to connect computer network.For realizing required work, during installation antenna is hung on the cantilever of top, track, the sending and receiving antenna surface is placed to road, is inclination angle ψ with road.Through the big or small control antenna radiation scope of control ψ, thus the working range of control ETC.
Claims (8)
1. an electronic charging system without parking comprises microstrip antenna plate and feed connection with low secondary lobe circularly polarization microstrip array antenna; The microstrip antenna plate is made up of double layer of metal paillon foil and one deck medium substrate, wherein is provided with medium substrate between the double layer of metal paillon foil;
Wherein, be positioned on the tinsel of top layer and comprise microstrip feed network and radiating element; Radiating element adopts individual, vertical two arrangement mode of horizontal n, forms the group formation formula of n * 2, n >=5; Being centered close on the same horizontal line of n radiating element transversely, vertically last two radiating elements is centered close on the same vertical line; Radiating element is the right-handed circular polarization antenna; It is poor that the radiating element of each file top has the counterclockwise 90 ° anglec of rotation with respect to the radiating element below the file, and the radiating element current feed phase that is positioned at the file top postpones 90 ° with respect to the radiating element that is positioned at the file below; Through microstrip feed network two radiating elements that are positioned at same file are carried out electric current constant amplitude feed;
Said microstrip feed network is made up of microstrip feed line, adopts the mode of parallel connection by feed connection whole microstrip feed network to be added excitation, makes whole microstrip feed network add electric current to each file radiating element; After being passed into electric current in the microstrip feed network and feeding by horizontal main feeder center; Be divided into n road electric current and be passed into the n bar by the quarter-wave feeder line that is parallel to each other respectively and divide in the feeder line, through every branch feeder line electric current is distributed to two radiating elements that are arranged in same file then; Simultaneously, be positioned at the long microstrip feed line length of radiating element increase by 1/4th electric waves of the relative below of radiating element of top in each file; Every branch feeder line all tilts clockwise, and every branch feeder line all and form 30 °～60 ° angles between main feeder makes the radiating element of vertical bisecting line both sides of main feeder symmetrical; For the radiating element that is positioned at the top in each file, divide feeder line by its feed of radiating element lower direction;
According to the impedance ratio of each quarter-wave feeder line and main feeder, obtain two the current amplitude ratios that radiating element fed of needed every branch feeder line in each file; The needed current amplitude ratio of radiating element on the same horizontal line adopts Dao Erfu-Chebyshev's ratio to distribute, and current phase equates.
2. a kind of according to claim 1 electronic charging system without parking is with low secondary lobe circularly polarization microstrip array antenna, and it is characterized in that: said medium substrate dielectric constant is 2.1～3.5, and loss angle is tan δ≤3 * 10
-3, thickness is less than 2mm.
3. a kind of according to claim 1 electronic charging system without parking is with low secondary lobe circularly polarization microstrip array antenna, and it is characterized in that: said medium substrate is a polytetrafluoroethylglass glass cloth.
4. a kind of according to claim 1 electronic charging system without parking is with low secondary lobe circularly polarization microstrip array antenna, and it is characterized in that: said tinsel is a Copper Foil, and thickness is 1Oz.
5. a kind of according to claim 1 electronic charging system without parking is with low secondary lobe circularly polarization microstrip array antenna, and it is characterized in that: microstrip feed network and radiating element are made on the tinsel of top layer through etched mode.
6. a kind of according to claim 1 electronic charging system without parking is with low secondary lobe circularly polarization microstrip array antenna, and it is characterized in that: said radiating element is the square chamfering right-handed circular polarization of a single-point feedback microstrip antenna paster.
7. a kind of according to claim 1 electronic charging system without parking is characterized in that with low secondary lobe circularly polarization microstrip array antenna: angle is 45 ° between every branch feeder line and main feeder.
8. a kind of according to claim 1 electronic charging system without parking is with low secondary lobe circularly polarization microstrip array antenna, and it is characterized in that: said feed connection is 50 ohm of SMA feed connection.
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|---|---|---|---|
| CN 201110178146 CN102394360B (en) | 2011-06-29 | 2011-06-29 | Low-sidelobe circular polarized microstrip array antenna applied to electronic toll collection system |
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|---|---|---|---|
| CN 201110178146 CN102394360B (en) | 2011-06-29 | 2011-06-29 | Low-sidelobe circular polarized microstrip array antenna applied to electronic toll collection system |
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|---|---|---|---|---|
| CN105789872A (en) * | 2016-03-25 | 2016-07-20 | 广东工业大学 | Compact circular polarization array antenna of 5.8GHzISA frequency range |
| CN106229658A (en) * | 2016-08-31 | 2016-12-14 | 北京握奇智能科技有限公司 | A kind of circular polarization microstrip antenna |
| CN106299681A (en) * | 2015-05-11 | 2017-01-04 | 上海华虹集成电路有限责任公司 | The method for designing of dual-band microstrip antenna and dual-band microstrip antenna |
| CN107453036A (en) * | 2016-05-10 | 2017-12-08 | 为昇科科技股份有限公司 | embedded feed-in antenna structure |
| CN107645066A (en) * | 2017-08-03 | 2018-01-30 | 东莞市云通通讯科技有限公司 | Improve the communication base station antenna that secondary lobe suppresses |
| CN109830812A (en) * | 2017-11-23 | 2019-05-31 | 明泰科技股份有限公司 | Array antenna |
| CN112164899A (en) * | 2020-09-25 | 2021-01-01 | 之江实验室 | Millimeter wave circularly polarized microstrip array antenna with wide axial ratio bandwidth |
| CN113451786A (en) * | 2021-06-25 | 2021-09-28 | 重庆两江卫星移动通信有限公司 | Control method for compact feed network and circularly polarized antenna array |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106299681A (en) * | 2015-05-11 | 2017-01-04 | 上海华虹集成电路有限责任公司 | The method for designing of dual-band microstrip antenna and dual-band microstrip antenna |
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| CN107453036A (en) * | 2016-05-10 | 2017-12-08 | 为昇科科技股份有限公司 | embedded feed-in antenna structure |
| CN107453036B (en) * | 2016-05-10 | 2021-04-13 | 为昇科科技股份有限公司 | Embedded feed-in antenna structure |
| CN106229658A (en) * | 2016-08-31 | 2016-12-14 | 北京握奇智能科技有限公司 | A kind of circular polarization microstrip antenna |
| CN107645066A (en) * | 2017-08-03 | 2018-01-30 | 东莞市云通通讯科技有限公司 | Improve the communication base station antenna that secondary lobe suppresses |
| CN109830812A (en) * | 2017-11-23 | 2019-05-31 | 明泰科技股份有限公司 | Array antenna |
| CN109830812B (en) * | 2017-11-23 | 2021-04-09 | 明泰科技股份有限公司 | Array antenna |
| CN112164899A (en) * | 2020-09-25 | 2021-01-01 | 之江实验室 | Millimeter wave circularly polarized microstrip array antenna with wide axial ratio bandwidth |
| CN112164899B (en) * | 2020-09-25 | 2023-03-10 | 之江实验室 | Millimeter wave circularly polarized microstrip array antenna with wide axial ratio bandwidth |
| CN113451786A (en) * | 2021-06-25 | 2021-09-28 | 重庆两江卫星移动通信有限公司 | Control method for compact feed network and circularly polarized antenna array |
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