CN109786939A - A kind of circular polarisation dualbeam gap cavity antenna - Google Patents
A kind of circular polarisation dualbeam gap cavity antenna Download PDFInfo
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- CN109786939A CN109786939A CN201910018344.8A CN201910018344A CN109786939A CN 109786939 A CN109786939 A CN 109786939A CN 201910018344 A CN201910018344 A CN 201910018344A CN 109786939 A CN109786939 A CN 109786939A
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- dualbeam
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Abstract
The invention discloses a kind of circular polarisation dualbeam gap cavity antennas, including upper medium substrate, lower medium substrate, two-beam antenna module and polarization conversion module.Two-beam antenna module includes resonant cavity and 16 slot antennas being each provided in resonant cavity；16 slot antennas are laid in 4*4 array, and form two 2*4 submatrixs；One 2*4 submatrix generates preceding to wave beam, another 2*4 submatrix generation back beam.The conversion module that polarizes includes 16 dipole metal bands, 16 dipole metal bands are laid on metal layer in 4*4 array, and it is corresponding with the position of 16 slot antennas, the central point of each dipole metal band is located in same vertical straight line with the central point of corresponding slot antenna.The polarization of electromagnetic wave characteristic that slot antenna gives off is changed into circular polarisation by linear polarization by polarization conversion module.Two-beam antenna with circular polarization characteristics can realize high-gain low section under structure and the simple situation of feeding classification, be suitable for indoor Radio Communication System.
Description
Technical field
The present invention relates to a kind of gap cavity antennas, especially a kind of circular polarisation dualbeam gap cavity antenna.
Background technique
With the development of indoor wireless communication, antenna is able to develop to realize better system performance.With traditional omnidirectional
Antenna is compared, and two-beam antenna can produce two directional beams.It can be useless to reduce in some direction by power limit
Energy radiation, to effectively improve link-quality and reduce channel disturbance.Meanwhile two-beam antenna will reduce antenna amount
And reduce feeding network complexity.Therefore, two-beam antenna is the good candidate of indoor wireless communication.
In a communications system, it usually needs antenna realizes high-gain to reduce signal interference.In addition, propagating mainly by room
The reflections affect of wall in interior wireless communication, ceiling, floor and barrier, causes frequency selective multipath to decline, circular polarisation
Wave transmitting/reception significantly reduces multipath fading.Therefore, realize that circular polarisation two-beam antenna also has certain practical significance.
However realize the circular polarisation two-beam antenna not a duck soup of a low section high-gain, because of traditional paster antenna
Since its Low emissivity efficiency and aperture area etc. limit, cause it that can not further increase gain, while circular polarisation is realized often
More complicated structure is needed to design, this can certainly will also introduce many lengthy and jumbled structures, therefore design a structure and feed letter
Single circular polarisation two-beam antenna becomes a problem.
Summary of the invention
In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a kind of circular polarisation dualbeams
Gap cavity antenna, the circular polarisation dualbeam gap cavity antenna have circular polarization characteristics, can be in structure and feeding classification
High-gain low section is realized in simple situation.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
A kind of circular polarisation dualbeam gap cavity antenna, including upper medium substrate, lower medium substrate, two-beam antenna module and
Polarize conversion module.
Upper medium substrate is co-axially located at the top of lower medium substrate, and has the air gap between the two.
The upper surface of lower medium substrate is provided with slot patch metal layer.
Two-beam antenna module is arranged on slot patch metal layer, and two-beam antenna module includes resonant cavity and is respectively provided with
16 slot antennas in resonant cavity；16 slot antennas are laid in 4*4 array, and form two 2*4 submatrixs；One of them
2*4 submatrix generates preceding to wave beam, another 2*4 submatrix generation back beam.
The upper surface of upper medium substrate is provided with metal layer.
The conversion module that polarizes includes 16 dipole metal bands, and 16 dipole metal bands are laid in 4*4 array
On upper metal layer, and corresponding with the position of 16 slot antennas, the central point of each dipole metal band and corresponding gap
The central point of antenna is located in same vertical straight line.
The polarization of electromagnetic wave characteristic that slot antenna gives off is changed into circular polarisation by linear polarization by polarization conversion module.
Resonant cavity is rectangular or square, using the center of resonant cavity as origin, by origin and with resonant cavity wherein one
The parallel straight line of side length will cross origin and the straight line parallel with another side length of resonant cavity be as y-axis as x-axis.
There are 7 parallel with x-axis eight grading lines, 7 eight grading lines include 4 surprises that interval is laid in resonant cavity
Number eight equal parts line and three even number eight equal parts lines；Every odd number eight equal parts line is nearby respectively provided with four slot antennas, four gaps
Antenna symmetry is arranged in y-axis two sides, and two slot antennas ipsilateral positioned at y-axis are located at the two of corresponding odd number eight equal parts line
Side.
Each slot antenna is rectangle, and the long side of slot antenna is parallel with x-axis.
Angle between each dipole metal band and x-axis is θ, and θ value can be adjusted according to polarization characteristic.
θ=+ 45 °, 0 ° or -45 °；When θ=+ 45 °, it is able to achieve left-hand circular polarization characteristic；When θ=0 °, it is able to achieve linear polarization
Characteristic；When θ=- 45 °, it is able to achieve right-handed circular polarization characteristic.
Resonant cavity size meets resonance higher mode TE440Size requirement, resonant cavity is evenly distributed by several short-circuit through-holes
It is formed.
Resonant cavity is square, side length WcThe diameter of=89.7 mm, each short circuit through-hole are the mm of d=1, short-circuit through-hole it
Between distance be the mm of g=1.5；The length of each slot antenna is SL=20.1 mm, width SW=4.2 mm；Slot antenna
The mm of minimum range m=6.7 between neighbouring even-numbered eight equal parts line；The length of each dipole metal bandP l =17.1 mm,
Width P W =4.4 mm；The air gap mm of height h=7.
The lower surface of lower medium substrate is provided with metal ground plane, and coaxial feed end is provided on metal ground plane.
On slot patch metal layer position corresponding with coaxial feed end be feed placement (Fx,Fy), whereinFx=-
9mm,Fy=8.7mm。
The characteristic impedance at coaxial feed end is 50 ohm.
The invention has the following beneficial effects:
1, resonant cavity higher modes TE is utilized440Standing wave characteristic distributions to form slot antenna array, antenna structure and feedback to slot
Electric mode is simple, realizes higher gain eventually by the method for array.
2,16 slot antennas are laid in 4*4 array, and two 2*4 submatrixs generate two wave beams of forward and backward respectively.
3,16 dipole metal band structures are simple, and can rotate angle according to it and change polarization characteristic, can be with
It realizes preferable circular polarisation effect, has the characteristics that low cost, low section, preferable radiation and impedance matching property, meet room
The actual needs of interior wireless communication system.
Detailed description of the invention
Fig. 1 (a) is the structural schematic diagram of upper medium substrate in a kind of cavity antenna of circular polarisation dualbeam of the invention gap.
Fig. 1 (b) is the structural schematic diagram of lower medium substrate in a kind of cavity antenna of circular polarisation dualbeam of the invention gap.
Fig. 2 (a) is that the structure of two-beam antenna module in a kind of cavity antenna of circular polarisation dualbeam of the invention gap is shown
It is intended to.
Fig. 2 (b) is the setting position of polarization conversion module in a kind of cavity antenna of circular polarisation dualbeam of the invention gap
Figure.
Fig. 2 (c) is a kind of longitudinal sectional drawing of circular polarisation dualbeam of the invention gap cavity antenna.
Fig. 3 (a) is the frequency and scattering parameter curve graph after being emulated using CST software to the present invention.
Fig. 3 (b) is the normalized radiation pattern after emulated using CST software to the present invention about the angle θ.
Fig. 4 (a) is the frequency and gain curve figure after being tested using Agilent 5245A vector network analyzer.
Fig. 4 (b) is AR(axis ratio after being tested using Agilent 5245A vector network analyzer) it is bent with the variation at the angle θ
Line chart.
Wherein have:
Medium substrate on 10.；Metal layer on 11.；
20. lower medium substrate；21. slot patch metal layer；22. metal ground plane；23. coaxial feed end；
30. two-beam antenna module；
31. short-circuit through-hole；32. odd number eight equal parts line；33. even number eight equal parts line；34. slot antenna；35. feed placement；In 36.
The heart plane of symmetry；
40. polarize conversion module；41. dipole metal band；
50. the air gap.
Specific embodiment
Xia Mianjiehefutuhejuti compare Jia Shishifangshiduibenfamingzuojinyibuxiangxishuoming.
In description of the invention, it is to be understood that the side of the instructions such as term " left side ", " right side ", " top ", " lower part "
Position or positional relationship are to be based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description of the present invention and simplification of the description,
Rather than the device or element of indication or suggestion meaning must have a particular orientation, be constructed and operated in a specific orientation, " the
One ", " second " etc. is not offered as the significance level of components, therefore is not considered as limiting the invention.In the present embodiment
The specific size of use technical solution solely for the purpose of illustration, is not intended to limit protection scope of the present invention.
As shown in Figure 2 (c), a kind of circular polarisation dualbeam gap cavity antenna, including upper medium substrate 10, lower medium
Substrate 20, two-beam antenna module 30 and polarization conversion module 40.
As shown in Fig. 1 (a), the upper surface of upper medium substrate is provided with metal layer 11.
Upper medium substrate is co-axially located at the top of lower medium substrate, and has the air gap 50 between the two.Between air
The highly preferred of gap is the mm of h=7, in practice carries out upper medium substrate and lower medium substrate preferably by the way of nylon screw
Support is fixed.
As shown in Fig. 1 (b) and Fig. 2 (c), the upper surface of lower medium substrate is provided with slot patch metal layer 21, lower medium
The lower surface of substrate is provided with metal ground plane 22, coaxial feed end 23 is provided on metal ground plane, characteristic impedance is preferred
It is 50 ohm.Coaxial feed end namely first port Port1, feeding classification are coaxial feeding, it is preferred to use SMA welding.
Upper medium substrate and lower medium substrate preferably use relative dielectric constant for 2.55, with a thickness of the PCB of 1.5mm
Plate.As an alternative, the pcb board of other specifications can also be used.
Two-beam antenna module is arranged on slot patch metal layer, and the width of slot patch metal layer is W.
As shown in Figure 2 (a), two-beam antenna module includes resonant cavity and 16 slot antennas being arranged in resonant cavity
34。
Two-beam antenna module preferably uses substrate integrated waveguide technology, and resonant cavity uses mode of resonance TE440, work frequency
5.8 GHz of communications band or so, resonant cavity size meet resonance higher mode TE indoors for section design440Size requirement, resonant cavity
It is preferred that by several evenly distributed formation of short-circuit through-hole 31.
Resonant cavity is preferably square, side length WcThe diameter of=89.7 mm, each short circuit through-hole are both preferably the mm of d=1, short
The distance between road through-hole is both preferably the mm of g=1.5.
Slot patch metal layer passes through short-circuit through-hole ground connection to play the role of blocking energy.
Above-mentioned 16 slot antennas are laid in 4*4 array, and form two 2*4 submatrixs.One of 2*4 submatrix generates
Forward direction wave beam, another 2*4 submatrix generate back beam.
16 slot antennas are preferably carried out as follows laying.
1. establishment of coordinate system.
Resonant cavity is rectangular or square, and the present invention is described in detail by taking square as an example, is with the center of resonant cavity
Origin, will cross origin and with resonant cavity wherein the long parallel straight line of a line as x-axis, by origin and with resonant cavity it is another
The parallel straight line of side length will cross origin and the straight line perpendicular with x/y plane is as z-axis as y-axis.
2. resonant cavity eight equal parts.
There are 7 parallel with x-axis eight grading lines, 7 eight grading lines include 4 surprises that interval is laid in resonant cavity
Number eight equal parts line 32 and three even number eight equal parts lines 33.
3. 16 slot antennas are laid.
Every odd number eight equal parts line is nearby respectively provided with four slot antennas, and four slot antennas are preferably symmetricly set on y-axis
Two sides, two slot antennas ipsilateral positioned at y-axis are located at the two sides of corresponding odd number eight equal parts line.16 slot antennas are with YZ
The plane of symmetry 36 centered on face (or the face yz), namely the phase that slot antenna positioned at central symmetry plane two sides needs to have opposite
Characteristic.
Therefore, the slot antenna that two rows are distributed in the x-direction positioned at center is located at the same lateral position of 4 odd number eight equal parts lines
(row's slot antenna is consistent in the x direction, is located on the left side or right side of odd number eight equal parts line) is so far located at+x
The wave beam of+x He-x both direction can be generated respectively with the two groups of gap 2*4 submatrixs in the direction-x.
Each slot antenna is both preferably rectangle, and the long side of slot antenna is parallel with x-axis.The length of each slot antenna
Degree is preferably SL=20.1 mm, width are preferably SW=4.2 mm；Most narrow spacing between slot antenna and neighbouring even-numbered eight equal parts line
From the mm of preferably m=6.7.
As an alternative, 16 slot antennas can also be laid otherwise, such as the one or two row tune in Fig. 2 (a)
Whole position etc..
On slot patch metal layer position corresponding with coaxial feed end be feed placement 35, coordinate be (Fx,Fy),
In,Fx=-9mm,Fy=8.7mm。
As shown in Fig. 2 (b), polarization conversion module includes 16 dipole metal bands, 41,16 dipole metal bands
It is laid on upper metal layer in 4*4 array, and corresponding with the position of 16 slot antennas, in each dipole metal band
Heart point is located in same vertical straight line with the central point of corresponding slot antenna namely phase center is consistent.
The length of each dipole metal band is preferablyP l =17.1 mm, width are preferably P W =4.4 m。
The polarization of electromagnetic wave characteristic that slot antenna gives off is changed into circular polarisation by linear polarization by polarization conversion module, most
The directional diagram of circular polarisation dualbeam can be generated eventually.
Angle between each dipole metal band and x-axis is θ, and θ value can be adjusted according to polarization characteristic.
θ=+ 45 °, 0 ° or -45 °；When θ=+ 45 °, it is able to achieve left-hand circular polarization characteristic；When θ=0 °, it is able to achieve linear polarization
Characteristic；When θ=- 45 °, it is able to achieve right-handed circular polarization characteristic.
By above-mentioned design, circular polarisation dualbeam gap cavity antenna design center frequency of the invention is 5.8 GHz,
As can be seen that analog result and measurement result are coincide well from Fig. 3 (a), Fig. 3 (b), Fig. 4 (a) and Fig. 4 (b).
The return loss that display measures in Fig. 3 (a) is better than -10 dB, from 5.74 to 5.86 GHz of range.
Fig. 3 (b) gives the main polarization and Cross polarization pattern of the emulation and test of the xz plane under 5.80 GHz frequency points.
It is obvious that antenna tool, there are two symmetrical directional beam, the gain of two wave beams is ± 24 ° in the maximum value of xz plane, and
Low 18 dB of the main polarization gain of the cross polarization ratio of gains, shows good cross polarization characteristics.Further, antenna is surveyed
The gain obtained is better than 12.5 dB.And the maximum gain difference between two wave beams is about 0.1 dB, this is because feed point
In the side of cavity, field distribution is caused to have a little uneven.
In addition, Fig. 4 (a) gives the gain frequency response of two wave beam tests in the pass-band, it can be seen that its yield value
It is relatively stable in passband.
As shown in Fig. 4 (b), the axis ratio of measurement in ± 50 ° of beam angle less than 3 dB, in addition to the region near 0 °,
This shows that two wave beams all have good circular polarization characteristics.Meanwhile the axis ratio of two beam frequencies measured in Fig. 3 (a) exists
3dB is below in passband.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail a variety of equivalents can be carried out to technical solution of the present invention within the scope of the technical concept of the present invention, this
A little equivalents all belong to the scope of protection of the present invention.
Claims (10)
1. a kind of circular polarisation dualbeam gap cavity antenna, it is characterised in that: including upper medium substrate, lower medium substrate, double
Beam antenna module and polarization conversion module；
Upper medium substrate is co-axially located at the top of lower medium substrate, and has the air gap between the two；
The upper surface of lower medium substrate is provided with slot patch metal layer；
Two-beam antenna module is arranged on slot patch metal layer, and two-beam antenna module includes resonant cavity and is arranged at humorous
16 slot antennas for shaking intracavitary；16 slot antennas are laid in 4*4 array, and form two 2*4 submatrixs；One of 2*4
Submatrix generates preceding to wave beam, another 2*4 submatrix generation back beam；
The upper surface of upper medium substrate is provided with metal layer；
The conversion module that polarizes includes 16 dipole metal bands, and 16 dipole metal bands are laid in gold in 4*4 array
Belong on layer, and corresponding with the position of 16 slot antennas, the central point of each dipole metal band and corresponding slot antenna
Central point be located in same vertical straight line；
The polarization of electromagnetic wave characteristic that slot antenna gives off is changed into circular polarisation by linear polarization by polarization conversion module.
2. circular polarisation dualbeam according to claim 1 gap cavity antenna, it is characterised in that: resonant cavity in rectangle or
Square will cross origin and wherein a line grows parallel straight line as x with resonant cavity using the center of resonant cavity as origin
Axis, will cross origin and the straight line parallel with another side length of resonant cavity is as y-axis；
There are 7 parallel with x-axis eight grading lines, 7 eight grading lines include 4 odd numbers eight that interval is laid in resonant cavity
Bisector and three even number eight equal parts lines；Every odd number eight equal parts line is nearby respectively provided with four slot antennas, four slot antennas
Y-axis two sides are symmetricly set on, two slot antennas ipsilateral positioned at y-axis are located at the two sides of corresponding odd number eight equal parts line.
3. circular polarisation dualbeam according to claim 2 gap cavity antenna, it is characterised in that: each slot antenna is equal
Long side for rectangle, slot antenna is parallel with x-axis.
4. circular polarisation dualbeam according to claim 2 or 3 gap cavity antenna, it is characterised in that: each dipole
Angle between metal band and x-axis is θ, and θ value can be adjusted according to polarization characteristic.
5. circular polarisation dualbeam according to claim 4 gap cavity antenna, it is characterised in that: θ=+ 45 °, 0 ° or-
45°；When θ=+ 45 °, it is able to achieve left-hand circular polarization characteristic；When θ=0 °, it is able to achieve linear polarization characteristics；It, can be real when θ=- 45 °
Existing right-handed circular polarization characteristic.
6. circular polarisation dualbeam according to claim 5 gap cavity antenna, it is characterised in that: resonant cavity size meets
Resonance higher mode TE440Size requirement, resonant cavity is by several short-circuit evenly distributed formation of through-hole.
7. circular polarisation dualbeam according to claim 6 gap cavity antenna, it is characterised in that: resonant cavity is in pros
Shape, side length WcThe diameter of=89.7 mm, each short circuit through-hole are the mm of d=1, and the distance between short-circuit through-hole is g=1.5
mm；The length of each slot antenna is SL=20.1 mm, width SW=4.2 mm；Slot antenna and neighbouring even-numbered eight equal parts line
Between the mm of minimum range m=6.7；The length of each dipole metal bandP l =17.1 mm, width P W =4.4 mm；Air
The mm of clearance height h=7.
8. circular polarisation dualbeam according to claim 7 gap cavity antenna, it is characterised in that: under lower medium substrate
Surface is provided with metal ground plane, and coaxial feed end is provided on metal ground plane.
9. circular polarisation dualbeam according to claim 8 gap cavity antenna, it is characterised in that: slot patch metal layer
Upper position corresponding with coaxial feed end for feed placement (Fx,Fy), whereinFx=-9mm,Fy=8.7mm。
10. circular polarisation dualbeam according to claim 8 gap cavity antenna, it is characterised in that: coaxial feed end
Characteristic impedance is 50 ohm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910018344.8A CN109786939B (en) | 2019-01-09 | 2019-01-09 | Circularly polarized dual-beam gap resonant cavity antenna |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910018344.8A CN109786939B (en) | 2019-01-09 | 2019-01-09 | Circularly polarized dual-beam gap resonant cavity antenna |
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| CN109786939A true CN109786939A (en) | 2019-05-21 |
| CN109786939B CN109786939B (en) | 2020-08-04 |
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Cited By (3)
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| CN111987467A (en) * | 2020-09-09 | 2020-11-24 | 南京工程学院 | Method for expanding axial ratio bandwidth of back cavity gap circularly polarized antenna |
| CN115036682A (en) * | 2022-05-20 | 2022-09-09 | 天津大学 | Circular polarized antenna with wide beam performance covering whole upper half space and based on high-order mode non-uniform compressed dipole |
| CN115101914A (en) * | 2022-06-30 | 2022-09-23 | 中国电子科技集团公司第三十八研究所 | Cavity antenna array with low profile and flexible caliber and resonant cavity thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111987467A (en) * | 2020-09-09 | 2020-11-24 | 南京工程学院 | Method for expanding axial ratio bandwidth of back cavity gap circularly polarized antenna |
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| CN115036682B (en) * | 2022-05-20 | 2024-01-26 | 天津大学 | Circularly polarized antenna with wide beam performance covering whole upper half space and based on high-order mode non-uniform compressed dipole |
| CN115101914A (en) * | 2022-06-30 | 2022-09-23 | 中国电子科技集团公司第三十八研究所 | Cavity antenna array with low profile and flexible caliber and resonant cavity thereof |
| CN115101914B (en) * | 2022-06-30 | 2023-07-21 | 中国电子科技集团公司第三十八研究所 | Cavity antenna array with low profile and flexible caliber |
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