CN108232463A - Choke coil for satellite navigation measurement type antenna - Google Patents
Choke coil for satellite navigation measurement type antenna Download PDFInfo
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- CN108232463A CN108232463A CN201810168744.2A CN201810168744A CN108232463A CN 108232463 A CN108232463 A CN 108232463A CN 201810168744 A CN201810168744 A CN 201810168744A CN 108232463 A CN108232463 A CN 108232463A
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- 238000005259 measurement Methods 0.000 title claims abstract description 21
- 239000002184 metal Substances 0.000 claims abstract description 41
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- 230000002829 reductive effect Effects 0.000 abstract description 4
- 230000002401 inhibitory effect Effects 0.000 abstract description 2
- 238000004088 simulation Methods 0.000 description 14
- 238000013461 design Methods 0.000 description 12
- 230000008859 change Effects 0.000 description 6
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- 238000005266 casting Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
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- 230000003595 spectral effect Effects 0.000 description 2
- 102000011842 Serrate-Jagged Proteins Human genes 0.000 description 1
- 108010036039 Serrate-Jagged Proteins Proteins 0.000 description 1
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Classifications
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- 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
- H01Q15/14—Reflecting surfaces; Equivalent structures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/02—Details
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Abstract
The utility model provides a choke for satellite navigation measurement type antenna, includes the cylindrical center core of vertical setting, be provided with a plurality of circular shape chokes by lower supreme equidistant on the center core, each choke all sets up with the center core is coaxial, form the choke groove between the upper and lower adjacent choke, the width in choke groove is interval between the upper and lower adjacent choke promptly, the vertical metal ring that is provided with on the choke that is located the center core top, the diameter of metal ring is the diameter that is located the choke at center core top promptly, metal ring and the coaxial setting of center core, the upper end outer fringe of metal ring is the zigzag outer fringe that the round has continuous sawtooth, the cavity that is located the saw tooth outer fringe that the choke at center core top and metal ring enclose is reflection cavity promptly. The vertical choke is combined with the reflection cavity with the outer edge of the saw tooth positioned at the top of the vertical choke, so that the overall diameter of the choke is reduced, and the effect of inhibiting the backward radiation of the antenna is improved.
Description
Technical field
The present invention relates to field of antenna, particularly, are related to a kind of miniaturization applied to satellite navigation measurement type antenna and grip
Stream circle.
Background technology
High-acruracy survey antenna is the sensing device of high-precision satellite navigation application terminal, and performance directly decides system
Positioning accuracy.A key index for weighing high-acruracy survey antenna performance is the ability of anti-multipath of antenna, is reflected in antenna and sets
It is backward radiation rejection ability on meter.At present, it is most widely used, the antenna backward radiation of technology mature and reliable the most inhibits dress
It is choke coil to put.
Choke coil is a series of (ordinarily being about 4~5 circles) the grounded metal donuts for being centered around antenna periphery, with ground connection
Face forms a series of (one fewer than annulus) ring recess structures together, and the height and width of ring recess are determined by working frequency, generally,
The height of ring recess is about 1/4 wavelength, and width is about 1/20~1/10 wavelength.The ring recess structure on this antenna periphery can press down
The surface wave propagation of antenna processed so as to fulfill the inhibition of antenna backward radiation, therefore is called choke coil.
Although traditional plane choke coil and three-dimensional choke coil superior performance, shortcoming is that size is huger, whole gold
Belonging to casting causes weight excessive, and installation is inconvenient.For No. three global systems of the Big Dipper, also a large amount of monitoring station overseas is built
Task, excessive antenna can aggravate the burden transported and installed.On the other hand, for commercial antenna, miniature antenna due to
Its is light, flexibly and the characteristics of inexpensive is also constantly subjected to more favor.
Some the miniaturization high-precision antenna technologies occurred at present also there are it is various the defects of.Such as：Hot Wheels
Antenna is low in the radiation efficiency of certain frequency points, and gain is inadequate；The horizontal direction gain drop for inhibiting surface wave paster antenna is excessive
The horizontal gain that can lead to antenna is too low, and moonscope segmental arc is too short, and this antenna frequency band is very narrow, is not appropriate for more constellations
The application scenario of observation requirements.In general, high-precision antennas of these miniaturizations be also difficult to meet the monitoring station of big ground level should
With currently the only to declare that the light weight type antenna that reach big ground level high-precision applications standard is the Zephyr of Tian Bao company
Geodetic, the antenna are eliminated the surface wave of paster antenna using invisbile plane surface impedance coating, reach inhibition backward radiation
Purpose, the section of the antenna is greatly lowered, but in order to achieve over the front and rear ratio of 30dB, the diameter of antenna is more than 300mm.
It can be seen that the maximum restraining factors of limitation choke coil antenna application scope are its volume and weights.Normal conditions
Under, the diameter of common choke coil is more than 300mm, and whole by metal casting, weight is 5~8 kilograms.Due to inconvenient to carry, grip
Stream circle antenna is typically used in the occasion that ground monitoring station, reference station etc. frequently need not be moved or are completely fixed.And some are moved
Dynamic high-acruracy survey application, such as field geology measure, and can only often use the non-choke coil of the opposite reduction of anti-multipath performance
High-precision antenna.It not yet retrieves and can be convenient for carrying at present, suitable for the miniaturization choke coil high-precision of field measurement occasion
Antenna.
Invention content
In view of the defects existing in the prior art, it is a kind of for satellite navigation measurement type antenna present invention aims at providing
Choke coil is a kind of choke coil of miniaturization, small, light-weight, but is capable of providing no less than conventional choke circle
Ability of anti-multipath so as to expand the application range of choke coil antenna, while reduces the cost of choke coil high-precision antenna.
To achieve the above object, the present invention uses following technical scheme：
A kind of choke coil for satellite navigation measurement type antenna, including the cylindrical core being vertically arranged, in core
Spaced set has multiple circular choke coils from the bottom to top, and each choke coil is coaxially disposed with core, neighbouring chokes
Choke groove is formed between circle, the width of choke groove is the spacing between neighbouring choke coil, at the top of core
A metal ring is vertically arranged on choke coil, the diameter of metal ring is located at the diameter of the choke coil at the top of core, metal
Annulus is coaxially disposed with core, and the upper end outer rim of the metal ring has the zigzag outer rim of continuous sawtooth, position for a circle
The cavity with sawtooth outer rim that choke coil at the top of core is surrounded with metal ring is reflection chamber.The chokes of the present invention
The place that coil structures are different from conventional choke circle is that multiple choke coils are setting up and down, the choke groove formed between adjacent choke coil
In mounted on top, without expanding to the periphery, choke coil integral diameter is thus substantially reduced.In order to whole in reduction choke coil
While body diameter, the effect that this vertical choke coil of the present invention inhibits antenna backward radiation is improved, the present invention is gripping vertically
The reflection chamber with sawtooth outer rim combined at the top of vertical choke coil on the basis of stream circle completes antenna backwards jointly
Radiation inhibits.
Antenna element is positioned in the reflection chamber with sawtooth outer rim, surface wave propagation to reflection chamber the upper end
Outer rim (i.e. the upper end outer rim of metal ring), if reflection chamber the upper end outer rim is smooth, in upper end, outer rim can shape
Into stable circular induced current, and excite stable polarized radiation.And the upper end outer rim of metal ring of the present invention is zigzag
Outer rim, zigzag outer rim can change the current distribution at edge, and to serrate mouth face, current density, which can be decomposed into, prolongs annulus
Tangential component and perpendicular to tangential component, since current density vertically upward and vertically downward is about the same more, sawtooth
The effective current that mouth face can form radiation is less than adenticulate mouth face effective current, therefore its backscattering is smaller.Here it is saws
The mechanism of the consistent backscattering of tooth-shape structure.Its sawtooth outer rim of reflection chamber with sawtooth outer rim can destroy this stable annular
Faradic formation weakens the excitation of polarized radiation, so as to inhibit antenna backward radiation.
Further, the spacing between neighbouring choke coil is equal.
Further, all choke coils and metal ring are made of the metal of same thickness.
Further, the overall structure that entire choke coil is integrally formed, using casting or die sinking casting by the way of into
Type.
Further, multiple regular shapes or the end to end upper end for being enclosed metal ring of irregular sawtooth
Outer rim.Further, present invention preferably employs the sawtooth of regular shape, the zigzag in the upper end outer rim of the metal ring
Shape, size all same, sawtooth can be half round saw tooth, trapezoidal sawtooth, triangular sawtooth or sinusoidal sawtooth.Metal ring it is upper
Circumferentially be distributed in the outer rim of end a circle it is continuous it is of course also possible to by the upper end outer rim of metal ring be designed as a circle it is continuous,
Zigzag outer rim be uniformly or non-uniformly distributed, irregular shape, but although some complicated irregular zigzag fashions have
The good backward radiation being likely to be obtained inhibits, but is not only considered as theoretic optimal effectiveness for the research of antenna, also
The realizability being considered as in engineering.
For the choke coil provided by the present invention for satellite navigation measurement type antenna, comparison is with rectangular sawtooth, trapezoidal
The choke coil for satellite navigation measurement type antenna of sawtooth, triangular sawtooth and sinusoidal sawtooth, different shape sawtooth is to frequency
Point is front and rear than improvement difference.In L2 frequency ranges, sinusoidal sawtooth promotes that effect is best, and triangular sawtooth takes second place, in L1 frequency ranges, three
Angular sawtooth effect is best, and sinusoidal sawtooth is secondly.In general, the improvement of triangular sawtooth and sinusoidal sawtooth is better than other
Shape.Different shape sawtooth promotes low elevation gain effect difference, in entire L frequency ranges, is arranged according to low elevation gain lifting capacity
Sequence is followed successively by rectangular sawtooth, trapezoidal sawtooth, triangular sawtooth and sinusoidal sawtooth.But either load the sawtooth knot of which kind of shape
10 ° of least gains of structure antenna elevation angle are all higher than -5dB.
Further, there is antenna performance and influence in serration depth, and the maximum vertical height of the metal ring is as anti-
Penetrate housing depth, the height ratio of serration depth and reflection chamber height is between 0.6~0.8.In entire L frequency ranges, work as depth
When ratio is less than 0.8, front and rear ratio increases with serration depth；In L2 frequency ranges, 10 ° of elevation angle axis ratio is high with reflection chamber in serration depth
The height ratio of degree is best when being 0.6.
Further, there is also influences on antenna performance for reflection chamber height, consider various aspects of performance, reflection chamber
The preferred scope of height is 51~57mm.
Further, there is also influences on antenna performance for the number of sawtooth, consider various aspects of performance, metal ring
8~12 continuous and uniform rectangular sawtooth, trapezoidal sawtooth, triangular sawtooth or sinusoidal sawtooth are distributed in the outer rim of upper end.
Relative to the prior art, present invention produces following advantageous effects：
The present invention can reach the ability of anti-multipath of antenna by the reflection chamber of vertical choke coil junction belt sawtooth outer rim
To the level of even more than conventional choke circle antenna, and its volume is about the 1/3~1/5 of the latter.
Description of the drawings
Fig. 1 gives the overall structure sectional view of the specific embodiment of the present invention；
Figure label：1st, core；2nd, choke coil；3rd, choke groove；4th, metal ring；5th, sawtooth；6th, reflection chamber.
Fig. 2 is through emulating the obtained frequency curve chart of antenna properties under the design parameter provided in table 1；Wherein
Fig. 2 (a) is that the front and rear of antenna compares curve graph；Fig. 2 (b) is 10 ° of the elevation angle least gain curve graph of antenna；Fig. 2 (c) is antenna
The maximum axis in 10 ° of the elevation angle compares curve graph；Fig. 2 (d) is the Phase center stability curve graph of antenna.
Fig. 3 is several reflection chambers with different shape sawtooth outer rim, and wherein Fig. 3 (a) to Fig. 3 (b) respectively illustrates band
The reflection chamber of rectangular sawtooth, trapezoidal sawtooth, triangular sawtooth and sinusoidal sawtooth outer rim.
Fig. 4 is the curve graph that front and rear ratio and the gain of 10 ° of the elevation angle change with frequency under different shape sawtooth；Wherein each label
And its meaning is：null：Without sawtooth, square：Rectangular sawtooth, trapezia：Trapezoidal sawtooth, triangle：Triangular sawtooth,
sinusoid：Sinusoidal sawtooth.
Fig. 5 is antenna key performance simulation result figure in the case of different serration depths；
Fig. 6 is antenna key performance simulation result figure under different reflection chamber altitudes；
Fig. 7 is antenna key performance simulation result figure in the case of different sawtooth numbers；
Fig. 8 is antenna key performance simulation result figure in the case of different choke groove depths；
Fig. 9 is antenna key performance simulation result figure in the case of different choke coil groove widths；
Figure 10 is antenna key performance simulation result figure in the case of different choke groove numbers.
Specific embodiment
Below in conjunction with the attached drawing in figure of the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out it is clear,
It is fully described by, is described in further details, but embodiments of the present invention are not limited only to this.
Fig. 1 gives the overall structure sectional view of the specific embodiment of the present invention.As shown in Figure 1, a kind of be used for satellite
Navigate the choke coil of measurement type antenna, including the cylindrical core 1 being vertically arranged, the spaced set from the bottom to top in core 1
There are multiple circular choke coils 2, each choke coil 2 is coaxially disposed with core 1, neighbouring and spaced set is gripped to each other
Choke groove 3 is formed between stream circle 2, the width of choke groove 3 is the spacing between neighbouring choke coil 2, positioned at core 1
A metal ring 4 is vertically arranged on the choke coil 2 at top, the diameter of metal ring 4 is the choke coil 2 being located at the top of core
Diameter, metal ring 4 are coaxially disposed with core 1, and the upper end outer rim of the metal ring 4 has continuous identical size for a circle
Triangular sawtooth 5 zigzag outer rim, the band sawtooth outer rim that choke coil 2 at the top of core is surrounded with metal ring 4
Cavity be reflection chamber 6.The overall structure that entire choke coil of the invention is integrally formed, is cast using casting or die sinking
Mode be molded.Wherein：All choke coils 2 and metal ring 4 are made of the metal of same thickness.As shown in figure 3,
Zigzag fashion in the zigzag outer rim can be rectangular sawtooth, trapezoidal sawtooth, triangular sawtooth or sinusoidal sawtooth.
In the present invention, with reference to Fig. 1, setting for the choke coil provided by the present invention for satellite navigation measurement type antenna is defined
It is as follows to count parameter：
(1) reflection chamber height, H1；
(2) ratio of serration depth and reflection chamber height (the maximum vertical height of metal ring is reflection chamber height)
Value, k；
(3) sawtooth number is N；
(4) depth of choke groove is H2；
(5) width of choke groove is w；
(6) number of choke groove is M；
(7) choke coil integral diameter is D；
(8) choke coil whole height is H；
(9) the metal wall thickness of choke coil and metal ring is d.
In above-mentioned parameter, (1) to (6) item parameter can generate significant impact to the performance of antenna different frequency range, need
It optimizes.According to high-precision antenna minimize demand, under the premise of performance requirement is met, the integral diameter of choke coil and
Height should be small as possible.The thickness of metal structure is smaller on performance influence, according to machining accuracy and structural strength, sets cavity and grips
The thickness of stream circle metallic walls is 2mm.
Fig. 1 gives the overall structure sectional view of the specific embodiment of the present invention, for the specific implementation provided in Fig. 1
Example is provided with the initial parameter of the present embodiment choke coil emulation according to table 1.Antenna is emulated using CST, simulated extraction
Performance indicator includes the front and rear ratio of the Big Dipper and each frequency points of GPS, 10 ° of elevation angle least gain, in the maximum axis ratio in 10 ° of the elevation angle and phase
Heart stability (10 ° of the elevation angle or more phase data is fitted, herein without specified otherwise in the case of, phase center fitting is adopted
With this standard).
The design parameter of 1 the present embodiment choke coil of table
Fig. 2 shows the frequency curves of antenna properties obtained under the design parameter provided in table 1 through emulation.My god
10 ° of the elevation angle least gain of line is respectively less than 1mm in -3dB or so, maximum axis than about 3dB, phase center, and front and rear ratio exists
Between 30dB, it is seen that the simulation result of antenna is ideal under the design parameter provided in table 1.
Below using the front and rear than, as evaluation index, illustrating different shape sawtooth to antenna performance with low elevation gain of antenna
It influences.Several frequently seen sawtooth geometry is analyzed below, respectively rectangular sawtooth, trapezoidal sawtooth, triangular sawtooth
With sinusoidal broached-tooth design.Fig. 3 (a) to Fig. 3 (b) is respectively illustrated with rectangular sawtooth, trapezoidal sawtooth, triangular sawtooth and positive backsawing
The reflection chamber of tooth outer rim.
For choke coil provided by the invention, the shape of set sawtooth can there are shadows to antenna performance on the reflection chamber
It rings.Reflection chamber jagged edges of different shapes can caused by current distribution there is also larger difference, theoretically speaking, have
Analytic Method may be used in the electromagnetic problems of regular borders, but the complexity of electromagnetic problems can make problem become vast and numerous
And it is inefficient, it is likely to for the effect finally obtained and uneconomical.The present invention is directly soft using computer Electromagnetic Simulation
Part emulates sawtooth reflection chamber of different shapes.Evaluation index is for having identical serration depth and sawtooth number
Cavity, in the case where not significantly reducing low elevation gain, the front and rear ratio of antenna reaches maximum.
It is emulated using CST, radiation source is placed in reflection chamber, four kinds of broached-tooth designs of reflection chamber loading are as schemed
Shown in 3.A diameter of 150mm of reflection chamber, reflection chamber height are 54mm.For sawtooth of different shapes, when emulation, advises
It is 12 to determine the sawtooth number on reflection chamber, and the depth of sawtooth is the half of reflection chamber height.Obtain the front and rear ratio of each frequency point
And 10 ° of elevation angle least gain is as shown in Figure 4.
It can be obtained by Fig. 4 as drawn a conclusion：
First, after the sawtooth for loading homogeneous texture, aerial radiation it is front and rear than and low elevation gain get a promotion, verify
Inhibition of the broached-tooth design to antenna backward radiation, while find that broached-tooth design can also play the work for promoting low elevation gain
With；
Second, different shape sawtooth is to front and rear than improvement difference.In L2 frequency ranges, sinusoidal sawtooth promotion effect is best,
Triangular sawtooth takes second place, and in L1 frequency ranges, triangular sawtooth effect is best, and sinusoidal sawtooth is secondly.In general, triangular sawtooth and
The improvement of sinusoidal sawtooth is better than other shapes.
Third, it is different that different shape sawtooth promotes low elevation gain effect, in entire L frequency ranges, according to low elevation gain
Lifting capacity sequence is followed successively by rectangular sawtooth, trapezoidal sawtooth, triangular sawtooth and sinusoidal sawtooth.Load broached-tooth design antenna elevation angle
10 ° of least gains are all higher than -5dB.
Triangular sawtooth and sinusoidal broached-tooth design utmostly improve front and rear than performance, and rectangular sawtooth is to low elevation gain
Promoted it is maximum, but due under all broached-tooth designs the gain of 10 ° of the elevation angle be all higher than -4dB, and the gain difference between different sawtooth
Value is less than 1dB, it is possible to think that triangular sawtooth and sinusoidal sawtooth provide best performance improvement for antenna.
Triangular sawtooth is about 10dB and 6dB to the improvement of front and rear ratio in L1 spectral coverages and L2 spectral coverages, and sinusoidal sawtooth changes
It is kind to respectively may be about 8dB and 7dB, it is seen that influence difference of two kinds of sawtooth to antenna performance is little.For antenna realization, triangle
Shape broached-tooth design is exactly difficulty of processing smaller there are one very big advantage with respect to sinusoidal structured, is controlled conducive to machining accuracy.
For embodiment as indicated with 1, there is influence in serration depth to antenna performance.Fig. 5 is different serration depth situations
Lower antenna key performance simulation result figure；In emulation, the ratio of serration depth and reflection chamber height is set to 0,0.2,
0.4,0.6,0.8 and 1.It is as follows that influence of the serration depth to antenna performance can be summarized：
(1) in entire L frequency ranges, when depth ratio is less than 0.8, front and rear ratio increases with serration depth, depth ratio 1
When, it is front and rear than compared to 0.8 when have apparent reduction；
(2) in L2 frequency ranges, 10 ° of elevation angle axis ratio first improves with serration depth increase, rear to deteriorate, serration depth and housing depth
The ratio between be 0.6 when it is best, L1 frequency ranges inner shaft ratio deteriorates always with serration depth increase, the ratio between serration depth and reflection chamber height
10 ° of elevation angle axis ratio will be only slight beyond 3dB when being 1；
(3) generally speaking, serration depth more 10 ° of gains of big-elevation are higher, but change and be less than 1dB；
(4) generally speaking, the bigger Phase center stability of serration depth is poorer, but the phase center of worst condition still exists
Within 1mm.
Comprehensive various aspects of performance, the ratio of serration depth relative reflection housing depth are proper between 0.6~0.8.
For embodiment as indicated with 1, there is influence in reflection chamber height to antenna performance.Fig. 6 is different reflection chambers
Antenna key performance simulation result figure under altitudes；The reflection chamber height set in emulation is respectively 48mm, 51mm,
54mm, 57mm and 60mm.It is as follows that influence of the reflection chamber height to antenna performance can be summarized：
(1) it is front and rear to be reduced afterwards than first increasing with the increase of reflection chamber height, highly for 51~54mm when front and rear ratio most
It is excellent；
(2) in addition to indivedual frequency points, the gain of 10 ° of the elevation angle steadily increases with the increase of reflection chamber height, is highly 60mm
When compare 48mm when increase about 1dB；
(3) in L2 frequency ranges, 10 ° of elevation angle axis ratio is significantly reduced with sawtooth chamber height increase, L1 frequency ranges variation unobvious；
(4) the indivedual frequency points of depolarization, PCV increase with reflection chamber height.
Consider various aspects of performance, the height of reflection chamber in 51~57mm select proper.
For embodiment as indicated with 1, on reflection chamber the setting of sawtooth number exist on antenna performance and influence.Fig. 7 is
Antenna key performance simulation result figure in the case of different sawtooth numbers；Sawtooth number is respectively set to 4,8,12,16 in emulation,
20.It is as follows that influence of the sawtooth number to antenna performance can be summarized：
(1) first, when sawtooth number is 4, four Key Performance Indicators that antenna emulation provides are undesirable；
(2) when sawtooth number is more than 4, front and rear ratio is continuously decreased with sawtooth number increase, and the gain of 10 ° of the elevation angle slightly rises,
PCV is gradually lowered, and axis ratio is without significant change.
With reference to various aspects of performance, sawtooth number select 8~12 when it is proper.
For embodiment as indicated with 1, there is influence in the setting of choke coil groove depth to antenna performance.Fig. 8 is different chokes
Antenna key performance simulation result figure in the case of ring recess depth；Choke groove is respectively set to 64,62,60,58,56,54 in emulation,
52 and 50mm.It is as follows that influence of the choke coil groove depth to antenna performance can be summarized：
(1) choke coil groove depth is on the front and rear smaller than influencing of L1 frequency ranges, on front and rear very violent, the symbol than influencing of L2 frequency ranges
The quarter-wave criterion of conventional choke circle is closed, the front and rear ratio if you need to peak low band with more than 30dB, choke coil groove depth should
More than 60mm；
(2) choke coil groove depth does not make significant difference to the gain of 10 ° of the elevation angle, has a certain impact, but 10 ° of elevation angle axis ratio without bright
Aobvious rule, and under worst condition, axis ratio is less than 3dB；
(3) when choke coil groove depth is too shallow, phase characteristic significantly deteriorates, it is ensured that below 1mm PCV, choke coil groove depth should be big
In 58mm.
With reference to various aspects of performance, choke coil groove depth should select 62mm left close to the quarter-wave of L2 frequency range lowest frequencies
Right groove depth is more suitable.
For embodiment as indicated with 1, there is influence in the setting of choke coil groove width to antenna performance.Fig. 9 is different chokes
Antenna key performance simulation result figure in the case of ring recess is wide；Groove width is respectively set to 8,9,10,11 and 12mm in emulation.It can see
Significant impact only is compared than having to front and rear below 1.2G frequencies to choke coil groove width, to it is more than 1.2G frequencies it is front and rear than with
And other performance indicators are influenced without apparent.From it is front and rear than index in terms of, groove width be 10mm when it is proper.
Figure 10 is antenna key performance simulation result figure in the case of different choke groove numbers；Choke groove number in emulation
It is respectively set to 1,2,3,4 and 5.It is as follows that influence of the saw choke groove number to antenna performance can be summarized：
(1) influence of the number of choke groove to 10 ° of elevation angle least gain and maximum axis ratio can be ignored, when number is less
The phase center of lowest frequency is slightly larger, remaining frequency point does not have significant change.
(2) when the number of choke groove is less than 3, front and rear ratio becomes larger with slot number increase, preceding when the number of slot is more than 3
No longer increase than index afterwards.
With reference to various aspects of performance, choke groove number should select 3, if having lower section requirement, choke groove number
It can also select 2.
In conclusion although the present invention is disclosed above with preferred embodiment, however, it is not to limit the invention, any
Those of ordinary skill in the art, without departing from the spirit and scope of the present invention, when various change and retouch, therefore this hair can be made
Bright protection domain is subject to the range defined depending on claims.
Claims (10)
1. a kind of choke coil for satellite navigation measurement type antenna, it is characterised in that：Including the cylindrical core being vertically arranged,
Spaced set has multiple circular choke coils from the bottom to top in core, and each choke coil is coaxially disposed with core, up and down phase
Choke groove is formed between adjacent choke coil, the width of choke groove is the spacing between neighbouring choke coil, in being located at
A metal ring is vertically arranged on choke coil at the top of core, the diameter of metal ring is the straight of the choke coil at the top of core
Diameter, metal ring are coaxially disposed with core, and the upper end outer rim of the metal ring is a zigzag of the circle with continuous sawtooth
Outer rim, the cavity with sawtooth outer rim that the choke coil at the top of core is surrounded with metal ring is reflection chamber.
2. the choke coil according to claim 1 for satellite navigation measurement type antenna, it is characterised in that：It is neighbouring to grip
Spacing between stream circle is equal.
3. the choke coil according to claim 1 for satellite navigation measurement type antenna, it is characterised in that：Multiple shape rule
Then or the end to end upper end outer rim for being enclosed metal ring of irregular sawtooth.
4. the choke coil according to claim 3 for satellite navigation measurement type antenna, it is characterised in that：The round metal
Zigzag fashion, size all same in the upper end outer rim of ring, sawtooth is rectangular sawtooth, trapezoidal sawtooth, triangular sawtooth or just
Backsawing tooth；
In L2 frequency ranges, sinusoidal sawtooth promotion effect is best, and triangular sawtooth takes second place；In L1 frequency ranges, triangular sawtooth effect is best,
Sinusoidal sawtooth is secondly；In entire L frequency ranges, rectangular sawtooth, trapezoidal sawtooth, triangle are followed successively by according to the sequence of low elevation gain lifting capacity
Shape sawtooth and sinusoidal sawtooth.
5. the choke coil according to claim 3 for satellite navigation measurement type antenna, it is characterised in that：The round metal
The maximum vertical height of ring is reflection chamber height, the height ratio of serration depth and reflection chamber height 0.6~0.8 it
Between；
In entire L frequency ranges, when depth ratio is less than 0.8, front and rear ratio increases with serration depth；In L2 frequency ranges, 10 ° of elevation angle axis ratio
It is best when the height ratio of serration depth and reflection chamber height is 0.6.
6. the choke coil according to claim 1 for satellite navigation measurement type antenna, it is characterised in that：Reflection chamber is high
Degree is 51~57mm.
7. the choke coil according to claim 1 for satellite navigation measurement type antenna, it is characterised in that：The number of sawtooth
It is 8~12.
8. the choke coil according to claim 1 for satellite navigation measurement type antenna, it is characterised in that：Choke groove
Number is 2 or 3.
9. the choke coil according to claim 1 for satellite navigation measurement type antenna, it is characterised in that：Choke coil groove depth
Quarter-wave for L2 frequency range lowest frequencies.
10. the choke coil according to claim 1 for satellite navigation measurement type antenna, it is characterised in that：Choke groove
Groove width is 10mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810168744.2A CN108232463B (en) | 2018-02-28 | 2018-02-28 | Choke coil for satellite navigation measurement type antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810168744.2A CN108232463B (en) | 2018-02-28 | 2018-02-28 | Choke coil for satellite navigation measurement type antenna |
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| CN108232463A true CN108232463A (en) | 2018-06-29 |
| CN108232463B CN108232463B (en) | 2024-02-27 |
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|---|---|
| CN108232463B (en) | 2024-02-27 |
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