CN103311662A - Multi-frequency round Beidou patch antenna with recursive coupled cavities - Google Patents
Multi-frequency round Beidou patch antenna with recursive coupled cavities Download PDFInfo
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- CN103311662A CN103311662A CN2013101832566A CN201310183256A CN103311662A CN 103311662 A CN103311662 A CN 103311662A CN 2013101832566 A CN2013101832566 A CN 2013101832566A CN 201310183256 A CN201310183256 A CN 201310183256A CN 103311662 A CN103311662 A CN 103311662A
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Abstract
The invention discloses a multi-frequency round Beidou patch antenna with recursive coupled cavities and relates to a microstrip antenna. The antenna is provided with a substrate, wherein an upper surface conducting layer and a lower surface conducting layer are paved on the two surfaces of the substrate; a multi-frequency round radiation patch with the recursive coupled cavities is machined on the upper surface conducting layer; the outer edge of the central axial line of the patch is arc notch-shaped; an 8-shaped slot is formed in the axial center; the coupled cavities are symmetrically and recursively loaded on the inner side of the arc, wherein the radius ratio between two adjacent coupled cavities is gradually reduced; the central distance between the cavities is the sum of the sum of the radiuses of the adjacent cavities and 0.5 to 1mm; the coupled cavities are positioned on the central axial line of the inner side of the arc; the 8-shaped slot is formed by crossly combining two small circles; the two small circles are symmetrically positioned on the central axial line; and the lower surface conducting layer serves as a grounding plate. The antenna is low in return loss, high in gain and low in receiving and emitting signal interference, and can be applied to a Beidou navigation system sending and receiving frequency band.
Description
Technical field
The present invention relates to a kind of microstrip antenna, relate in particular to a kind of circular Big Dipper paster antenna of the multifrequency with the recurrence coupling cavity for big-dipper satellite and GPS navigation system.
Background technology
Since two thousand, China has succeeded in sending up 4 Big Dipper generation navigation positioning satellites and 11 Big Dipper two generations navigation positioning satellites, and built Big Dipper generation navigation experiment system is also building the Big Dipper covering the whole world two generations global position system.This navigation system possesses location, time service, message and the GPS GPS wide area differential GPS function in China and surrounding area scope thereof at present, and has progressively played a significant role at numerous areas such as mapping, telecommunications, water conservancy, communications and transportation, fishery, exploration, forest fire protection and national security.Antenna is as the vitals of satellite navigation, and the quality of satellite navigation system is played an important role.
Satellite navigation receiver antenna is had following requirement: can see the similar whole episphere of satellite, antenna should provide uniform response.Antenna stops to receive when satellite is lower than the defined angle of pitch, in order to avoid serious multipath effect and tropospheric occurring, therefore will the coverage of antenna be limited.For navigation positioning satellite, require the low elevation gain can not be excessively low, so antenna pattern should have wider beamwidth.In the relative positioning system that utilizes Direct Phase to measure, the phase difference of the antenna output end of the different directions of corresponding navigation positioning satellite can cause sizable site error, and this error is that accurate land survey institute is unacceptable.In the overlay area, theoretically, antenna not only should provide the uniform response of amplitude, should also provide the uniform response of phase place.In antenna coverage areas to even phase response require most important, then even more important for the Phase Tracking receiver.
In today of information technology fast development, extensive use along with satellite communication system, research to the satellite communication system reception antenna emerges in an endless stream, and ICBM SHF satellite terminal antenna commonly used has crossed dipole antenna, four-arm spiral antenna, microstrip antenna and helical antenna at present.Wherein, microstrip antenna section is low, volume is little because having, lightweight, can be conformal, easy of integration, feeding classification flexibly, be convenient to obtain the good performances such as linear polarization and circular polarization and be widely used in the ICBM SHF satellite terminal receiving equipment.In addition, microstrip antenna also obtains a wide range of applications in many fields such as mobile communication, satellite communication, guided missile remote measurement, Doppler radars, but gain limited is major defect (the YB Thakare and Rajkumar.Design of fractal patch antenna for size and radar cross-section reduction.IET Microwave.Antenna Propagation of microstrip antenna always, 2010, vol.4, Iss.2, PP:175-181).
With the circular Big Dipper paster antenna of the multifrequency of recurrence coupling cavity, Integrated using the meander effect in irregular fractal structure, slit, and the frequency regulating and controlling effect of coupling cavity, have good radiation characteristic, can each parameter of flexible make it to be applicable to transmitting-receiving frequency range and other navigation system of dipper system.At present, the Big Dipper microstrip antenna with recurrence coupling cavity yet there are no report.
Summary of the invention
The object of the present invention is to provide that a return loss is low, gain is high, receive and transmit, it is little to disturb, and can be used for the circular Big Dipper paster antenna of the multifrequency with the recurrence coupling cavity of triones navigation system transmitting-receiving frequency range.
The present invention is provided with substrate, two surfaces at substrate are covered with upper surface conductor layer and lower surface conductor layer, the upper surface conductor layer is processed into the circular radiation patch of the multifrequency of recurrence coupling cavity, the circular radiation patch central axis of described multifrequency outer edge is the arc gap shape, the place, axle center has the 8-shaped slit, load the coupling cavity that radius diminishes gradually by the ratio η of adjacent two cavity radiuses in the inboard symmetrical recurrence of circular arc, η is 0.3～1, maximum Coupled Circle pitch-row decentre position is 1～10mm, the maximum radius of coupling circular hole is 0.4～6mm, and the cavity center distance adds 0.5～1mm for closing on cavity radius sum; Described coupling cavity body is positioned on the central axis of circular arc inboard; Described 8-shaped slit is to be intersected by two roundlets to be composited, and two roundlet symmetries are positioned on the central axis, and two roundlet distance center positions are 0.8～3mm, and radius is 1.2～6mm; The lower surface conductor layer is as ground plate.
Described substrate can adopt the high-k substrate, and dielectric constant can be 6～40, is preferably 18; Described substrate can adopt ceramic dielectric substrate or composite ceramic substrate, and substrate profile is than large circle or the rectangle of the circular radiation patch of multifrequency.The thickness of described substrate can be 2～4mm, is preferably 2.2mm.
Described upper surface conductor layer and lower surface conductor layer preferably use circle, and outline diameter is 8～50mm, preferably gets 25mm.
The diameter of the circular radiation patch of described multifrequency can be 8～50mm, preferably gets 25mm;
Described η is preferably 0.7.Maximum coupling aperture distance center position is preferably 7.5mm.Maximum coupled apertures radius is preferably 0.7mm.
Described two roundlet distance center positions are preferably 1.5mm, and radius of a circle is preferably 1.8mm.
The radius of the circular radiation patch of described multifrequency can be 4～25mm, and the center of circle of circular arc is positioned at that the distance center position can be 3～23mm on the central axis, is preferably 10.4mm; The radius of circular arc can be 1.5～12mm, is preferably 1.9mm.
Basic structure of the present invention can guarantee that frequency covers whole frequency range requirements of Beidou satellite system by adjusting the scope of above each parameter, optimize to obtain, and return loss S
11Can reach-below the 10dB, gain is looked the different antennae size and can be reached more than 2～4dB.
Compare the present invention with conventional microstrip antenna and have following advantage:
The present invention has used recurrence gradual change coupling cavity distributed constant the frequency of Big Dipper microstrip antenna to be implemented, considered simultaneously the meander effect in slit, complex optimum by series technique, realize the double frequency-band miniaturization of antenna, can satisfy well the requirement of the satellite communication systems such as the Big Dipper and GPS.
Owing to having adopted above structure, the present invention can be used for the transmitting-receiving frequency range of big-dipper satellite terminal, the embodiment working frequency range is 1.615～1.638GHz and 2.525～2.535GHz, the absolute bandwidth that is used for transmit frequency band is 23MHz, relative bandwidth is 1.44%, the absolute bandwidth that is used for the reception frequency range is 10MHz, and relative bandwidth is 0.41%.
Owing to having adopted above structure, can reasonably optimize the size of circular arc on the good conductor radiating surface, size and location, the recurrence ratio of coupling cavity, the size in 8-shaped slit, center obtains the frequency of expecting and the performance of each parameter of antenna as required.
In sum, the present invention has adopted the frequency regulation and control of coupling cavity, the meander effect in slit, irregular fractal structure, but has realized the conversion of High-frequency and low-frequency, the micro-strip paster antenna of frequency ratio flexible.Have that size is little, novel structure, radiation characteristic are good, be subjected to that such environmental effects is little, cost is low and be easy to the advantages such as integrated, can satisfy the satellite communication systems such as big-dipper satellite and GPS navigation to the requirement of antenna.
Utilize structural optimization of the present invention, can be locked in flexibly and easily in Big Dipper series global position system and the gps system by demand, also be expected to compatible other communications bands.
Description of drawings
Fig. 1 is that the structure of the embodiment of the invention forms schematic diagram.
Fig. 2 is the side schematic view of the embodiment of the invention.
Fig. 3 is the return loss (S of the embodiment of the invention
11) performance map.Abscissa represents frequency Frequency (GHz), and ordinate represents return loss intensity The return loss of the antenna (dB).
Fig. 4 is the E face directional diagram of the embodiment of the invention.Coordinate is polar coordinates in the drawings.
Fig. 5 is the H face directional diagram of the embodiment of the invention.Coordinate is polar coordinates in the drawings.
Embodiment
The invention will be further described below in conjunction with specific embodiments and the drawings.
With reference to Fig. 1 and 2, the invention process adopts two-sided copper-plated ceramic dielectric substrate 1, and it is long to be 25mm ± 0.05mm, and wide is 25mm ± 0.05mm, and height is 2.5mm ± 0.05mm.Two sides at ceramic dielectric substrate 1 is covered with copper, and a metal etch of medium substrate becomes with the circular radiation patch 2 of the double frequency of recurrence coupling cavity, and the another side metal is as ground plate face 3.The circular radiation patch of double frequency with the recurrence coupling cavity of etching in the copper-clad 2, its radiation patch central axis outer edge becomes the arc gap shape, the equal symmetry in the center of circle of circular arc is positioned on the central axis, place, paster axle center has the 8-shaped slit, four small sircle holes of asymmetrical load are coupled on the inboard central axis of circular arc simultaneously, mark 5 is circular arc among Fig. 1, and mark 6 is the coupling aperture, and mark 7 is the 8-shaped slit.The radius of described circular patch is got 11.8mm, 10.4mm is got in the distance of center circle decentre position of circular arc, the radius of circular arc is got 1.9mm, 7.5mm is got in Coupled Circle pitch-row decentre position, the radius of coupling circular hole is got 0.7mm, and described 8-shaped slit is to be intersected by two roundlets to be composited, and two roundlets are positioned on the central axis and Central Symmetry, 1.5mm is got in the distance center position, and radius is got 1.8mm.Mark 4 is power feed hole among Fig. 1, and it is that radius is 0.5mm ± 0.01mm, highly passes the hollow cylinder of ceramic dielectric substrate for 2.5mm ± 0.01mm.Adopt the form of copper eccentric axis feed among the present invention, as shown in Figure 2, this feed form is so that the S of antenna
11Lower, gain increases.Wherein the inner core of copper axis is connected with rectangular patch 2 by the feedback hole, and the outer core of copper axis links to each other with the reflecting plate 3 of ceramic dielectric plate lower surface.
Referring to Fig. 3, as can be seen from Figure 3, the working frequency range of antenna embodiment of the present invention is 1.615GHz～1.638GHz and 2.525GHz～2.535GHz.The return loss of this working frequency range internal antenna (S11) all-below the 10dB, the minimum return loss in the 1.6G frequency range is-43.65dB that the minimum return loss in the 2.5G frequency range is-22.58dB.As can be seen from above, the return loss performance at whole passband internal antenna can both reach requirement.Absolute bandwidth and the relative bandwidth of embodiment of the invention antenna in the 1.6G frequency range is respectively 23MHz and 1.44%; Absolute bandwidth in the 2.5G frequency range and relative bandwidth are respectively 10MHz and 0.41%, are better than general paster antenna, can be advantageously applied in the satellite communication systems such as the Big Dipper and GPS.
Referring to Fig. 4 and Fig. 5, Fig. 4 is E face directional diagram, and Fig. 5 is H face directional diagram.We find out that the present invention has directional radiation properties from figure, can satisfy the requirement of satellite communication system, and the gain of antenna is 3.85dB, have good gain characteristic, still can further optimize.
Referring to table 1, table 1 has provided manufacturing mismachining tolerance of the present invention to the situation that affects of antenna performance.
Table 1
Annotate: data are existing certain redundant in the table, and certain relevance is arranged between each parameter, and what provide is the equalization characteristic sample, and the parameter of can optimizing structure is according to demand finished particular design.
Manufacturing mismachining tolerance of the present invention is very large to each effect of parameters of antenna, needs manufacturing process very meticulous.For example, spacing, the size of ceramic dielectric substrate, dielectric-slab copper-clad thickness, feed position equal error when width, slit and each limit in size, slit on the paster are controlled in 5%, and the relative dielectric constant error of ceramic dielectric substrate is when being controlled in 5%, and the parameters of antenna changes little.
Embodiments of the invention have provided a dual-band antenna, and its frequency range is respectively 1.605GHz～1.638GHz and 2.525GHz～2.535GHz, can cover the working frequency range of big-dipper satellite and other global position systems.High performance dielectric baseplate material among the embodiment can adopt 6～40 high-k quality material as substrate, preferably get relative dielectric constant and be 18 composite ceramics, the length of ceramic dielectric plate is 8mm～50mm, wide is 8mm～50mm, thick is 2mm～4mm, preferably gets the cuboid of 25mm * 25mm * 2.5mm.
Claims (10)
1. with the circular Big Dipper paster antenna of the multifrequency of recurrence coupling cavity, it is characterized in that being provided with substrate, two surfaces at substrate are covered with upper surface conductor layer and lower surface conductor layer, the upper surface conductor layer is processed into the circular radiation patch of the multifrequency of recurrence coupling cavity, the circular radiation patch central axis of described multifrequency outer edge is the arc gap shape, the place, axle center has the 8-shaped slit, load the coupling cavity that radius diminishes gradually by the ratio η of adjacent two cavity radiuses in the inboard symmetrical recurrence of circular arc, η is 0.3～1, maximum Coupled Circle pitch-row decentre position is 1～10mm, the maximum radius of coupling circular hole is 0.4～6mm, and the cavity center distance adds 0.5～1mm for closing on cavity radius sum; Described coupling cavity body is positioned on the central axis of circular arc inboard; Described 8-shaped slit is to be intersected by two roundlets to be composited, and two roundlet symmetries are positioned on the central axis, and two roundlet distance center positions are 0.8～3mm, and radius is 1.2～6mm; The lower surface conductor layer is as ground plate.
2. as claimed in claim 1 with the circular Big Dipper paster antenna of the multifrequency of recurrence coupling cavity, it is characterized in that described substrate adopts the high-k substrate, dielectric constant is 6～40, is preferably 18.
3. as claimed in claim 1 with the circular Big Dipper paster antenna of the multifrequency of recurrence coupling cavity, it is characterized in that described substrate adopts ceramic dielectric substrate or composite ceramic substrate, substrate profile is than large circle or the rectangle of the circular radiation patch of multifrequency.
4. as claimed in claim 1 with the circular Big Dipper paster antenna of the multifrequency of recurrence coupling cavity, it is characterized in that the thickness of described substrate is 2～4mm, be preferably 2.2mm.
5. as claimed in claim 1 with the circular Big Dipper paster antenna of the multifrequency of recurrence coupling cavity, it is characterized in that described upper surface conductor layer and lower surface conductor layer for circular, outline diameter is 8～50mm, is preferably 25mm.
6. as claimed in claim 1 with the circular Big Dipper paster antenna of the multifrequency of recurrence coupling cavity, it is characterized in that the diameter of the circular radiation patch of described multifrequency is 8～50mm, be preferably 25mm.
7. as claimed in claim 1 with the circular Big Dipper paster antenna of the multifrequency of recurrence coupling cavity, it is characterized in that described η is 0.7.
8. as claimed in claim 1 with the circular Big Dipper paster antenna of the multifrequency of recurrence coupling cavity, it is characterized in that maximum coupling aperture distance center position is 7.5mm; Maximum coupled apertures radius is 0.7mm.
9. as claimed in claim 1 with the circular Big Dipper paster antenna of the multifrequency of recurrence coupling cavity, it is characterized in that described two roundlet distance center positions are 1.5mm, radius of a circle is 1.8mm.
10. as claimed in claim 1 with the circular Big Dipper paster antenna of the multifrequency of recurrence coupling cavity, the radius that it is characterized in that the circular radiation patch of described multifrequency is 4～25mm, the center of circle of circular arc is positioned at that the distance center position is 3～23mm on the central axis, is preferably 10.4mm; The radius of circular arc can be 1.5～12mm, is preferably 1.9mm.
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| CN201310183256.6A CN103311662B (en) | 2013-05-16 | 2013-05-16 | Multi-frequency round Beidou patch antenna with recursive coupled cavities |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105006657A (en) * | 2015-07-29 | 2015-10-28 | 厦门大学 | Fractal recursion control boomerang single-sided left-handed material |
| CN106229665A (en) * | 2016-09-11 | 2016-12-14 | 河南师范大学 | High frequency power absorption-type microstrip antenna |
| CN109119756A (en) * | 2017-06-22 | 2019-01-01 | 北京机电工程研究所 | A kind of wide-angle scanning micro-strip phased array antenna |
| CN111987435A (en) * | 2020-07-03 | 2020-11-24 | 华南理工大学 | Low-profile dual-polarized antenna, array antenna and wireless communication equipment |
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| US20110012788A1 (en) * | 2009-07-14 | 2011-01-20 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | Miniature Circularly Polarized Folded Patch Antenna |
| CN102769183A (en) * | 2012-07-13 | 2012-11-07 | 厦门大学 | Quadruple spiral distribution loading oscillator microstrip antenna applied to Beidou system |
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| US20050162318A1 (en) * | 2004-01-13 | 2005-07-28 | Alps Electric Co., Ltd. | Miniaturized patch antenna |
| US20110012788A1 (en) * | 2009-07-14 | 2011-01-20 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | Miniature Circularly Polarized Folded Patch Antenna |
| CN102769183A (en) * | 2012-07-13 | 2012-11-07 | 厦门大学 | Quadruple spiral distribution loading oscillator microstrip antenna applied to Beidou system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105006657A (en) * | 2015-07-29 | 2015-10-28 | 厦门大学 | Fractal recursion control boomerang single-sided left-handed material |
| CN105006657B (en) * | 2015-07-29 | 2017-11-10 | 厦门大学 | A kind of band divides the Cyclic dart type one side LHM structure of shape recursion control |
| CN106229665A (en) * | 2016-09-11 | 2016-12-14 | 河南师范大学 | High frequency power absorption-type microstrip antenna |
| CN109119756A (en) * | 2017-06-22 | 2019-01-01 | 北京机电工程研究所 | A kind of wide-angle scanning micro-strip phased array antenna |
| CN111987435A (en) * | 2020-07-03 | 2020-11-24 | 华南理工大学 | Low-profile dual-polarized antenna, array antenna and wireless communication equipment |
| CN111987435B (en) * | 2020-07-03 | 2021-11-12 | 华南理工大学 | Low-profile dual-polarized antenna, array antenna and wireless communication equipment |
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