CN104882672A - Wide bandwidth wave beam circular polarization Yagi-microstrip antenna - Google Patents
Wide bandwidth wave beam circular polarization Yagi-microstrip antenna Download PDFInfo
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- CN104882672A CN104882672A CN201510284153.8A CN201510284153A CN104882672A CN 104882672 A CN104882672 A CN 104882672A CN 201510284153 A CN201510284153 A CN 201510284153A CN 104882672 A CN104882672 A CN 104882672A
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Abstract
The invention provides a wide bandwidth wave beam circular polarization Yagi-microstrip antenna, belongs to the antenna technical field, and the antenna comprises a medium substrate, a ground plate, a square radiation paster, a microstrip oscillator set and a feed network; the microstrip oscillator set comprises a plurality of microstrip oscillators; the square paster is arranged on the top surface of the medium substrate; the microstrip oscillators are arranged in front, back, left and right directions of the square paster; the square radiation paster has two feed ports, a phase difference between the two feed ports is 90 degrees, and amplitudes are equal. The square paster is an excitation paster, and the microstrip oscillators belong to a parasitic portion; the square paster is combined with directing oscillators so as to effectively expand the wave beam width of the antenna; the wide bandwidth wave beam circular polarization Yagi-microstrip antenna is suitable for promotion application in the antenna technical field.
Description
Technical field
The invention belongs to antenna technical field, especially relate to a kind of broadband and wide wave beam circular polarization Yagi spark gap-microstrip antenna.
Background technology
Along with the development of satellite navigation and location system, multimodal satellite navigation system plays a part more and more important in the Working Life of human society.The current whole world satellite navigation and location system that is full-fledged and that also developing comprises the Big Dipper (COMPASS), GPS, Galileo and GLONASS tetra-large model.Therefore, the terminal antenna of multimodal satellite navigation system needs to cover four working frequency range navigated greatly.And general microstrip antenna narrow bandwidth, which has limited its application in multimode navigation antenna.Meanwhile, because circularly polarised wave has the characteristic of more weak multipath effect and stronger anti-sleet interference, in satellite navigation and location system, conventional satellite navigation signals is generally circularly polarised wave.Moreover, required antenna also has specific requirement to directional diagram.Antenna is space above ground level, and needing provides uniform amplitude response, forms broad beam antenna.Therefore, this proposes new requirement to terminal antenna.
Broad beam antenna is by changing antenna pattern, thus realizes the change to beamwidth.There is a kind of wide beam circular polarized antenna () in prior art, as shown in Figure 1, load monopole by a circular patch and four and form.Wherein circular patch is exciting unit, and four load monopole is parasitic element, utilizes the circular patch between same shaft assignment to carry out feed, realizes circular polarization radiation by gap of cracking on circular patch.Owing to loading the even summation effect between monopole and circular patch, the beamwidth of antenna can be made to obtain broadening.But owing to adding loading monopole, the section of this wide beam circular polarized antenna is higher, destroy the low section characteristic of microstrip antenna.In addition, parasitic loading monopole makes this antenna more difficult when the production and processing of reality.
Another kind of wide beam circular polarized antenna (S.X.Ta is there is in prior art, J.J.Han, I.Park.Compact CircularlyPolarized Composite Cavity-Backed Crossed Dipole for GPS Applications [J] .Journal ofElectromagnetic Engineering and Science, 2013,13 (1): 44-49), as shown in Figure 2, be made up of two printing crossed dipoless and a reflection cavity.By carrying out 90 ° of phase difference feeds to two crossed dipoless, circular polarization radiation can be formed.By by dipole bending and two sections of arrow-shaped distributions, meander technology is utilized to reduce to make its size.But the size of reflection cavity is too large, limits the application of this antenna.
The third wide beam circular polarized antenna (Z.K.Pan of prior art, W.X.Lin, Q.X.Chu.CompactWide-Beam Circularly-Polarized Microstrip Antenna with a Parasitic Ring for CNSS Application [J] .IEEE Transactions on Antennas and Propagation, 2014,62 (5): 2847-2850), as shown in Figure 3.This antenna utilizes parasitic ring to obtain broadening to form dual-layer atenna to make its beamwidth.Antenna is made up of upper and lower two layer medium plate, and the parasitic ring diameter on top dielectric plate is λ/4.The greatest irradiation direction of the radiation patch on layer dielectric plate is ° direction, θ=0, i.e. Z axis.The greatest irradiation direction of the parasitic ring on top dielectric plate is ° directions, θ=90.Therefore, by radiation patch and parasitic loops altogether, the beamwidth of antenna will broadening to a certain extent.The resonance frequency of this antenna and circular polarization performance determined by the circular patch size on layer dielectric plate and rectangle minor matters respectively.But the circularly polarised wave beam width of this antenna is very not desirable.
Summary of the invention
For overcoming above-mentioned defect, the invention provides a kind of novel wide beam circular polarized antenna, i.e. Yagi spark gap-microstrip antenna, the innovative point of this new antenna design is exactly that antenna is under the prerequisite of wideband operation, the director of Yagi antenna is combined with microband paste, thus makes the beamwidth of antenna obtain broadening.
The present invention specifically adopts following technical scheme:
A kind of broadband and wide wave beam circular polarization Yagi spark gap-microstrip antenna, its structure as shown in Figure 4, comprise the identical micro-strip oscillator group of medium substrate, square-shaped radiation paster, four groups of structures and grounding plate, described square-shaped radiation paster and four groups of micro-strip oscillator groups are all positioned at described medium substrate upper surface, and described grounding plate is positioned at described medium substrate lower surface; Described antenna adopts the coaxial orthogonal feed of dual-port, and described two coaxial feed ports amplitude when feed is equal, phase difference is 90 °, thus realizes circular polarization radiation; Described four groups of micro-strip oscillator groups are centered by square patch, and outside four sides laying respectively at described square-shaped radiation paster, each micro-strip oscillator group is formed by more than two the micro-strip oscillator parallel arrangements that length reduces gradually from the inside to the outside.
Described micro-strip oscillator is equivalent to the director in Yagi antenna, its effect exactly can by radiation patch square for centre the electromagnetic wave that encouraged, to surrounding level square institute broadening.
Further, in order to make square patch miniaturized, the heart has carried out cross slot treatment wherein, and the both sides of described cross bath overlap with two diagonal of square-shaped radiation paster respectively.
Further, because the probe portion of coaxial feed has inductive reactance, this can have influence on the input impedance of entire physical thus cause difficulty to coupling, the impact that the inductive reactance brought to make probe produces reduces as far as possible, each feedback point in radiation patch is outer is respectively arranged with a cannelure, feedback point is positioned at corresponding cannelure, by the condensance that this two annular grooves bring, the inductive reactance of probe can be reduced, antenna is made more easily to carry out impedance matching, reach resonance condition, thus broadening impedance bandwidth.
The invention has the beneficial effects as follows:
The present invention by square patch as excitation paster, micro-strip oscillator around its four edges is as parasitic a period of time, the length in parasitic a period of time reduces gradually and has the effect of guiding into, middle square patch electromagnetic wave energy straight up can be guided into the horizontal direction of surrounding, broad beam characteristic can be realized; Broad beam Yagi spark gap-microstrip antenna size of the present invention is little, and be with wide, circular polarization radiation characteristic is good, and antenna structure is easy to processing, with low cost.
Accompanying drawing explanation
Fig. 1 is the structure chart of the first wide beam circular polarized antenna in prior art;
Fig. 2 is the structure chart of the second wide beam circular polarized antenna in prior art;
Fig. 3 is the structure chart of the third wide beam circular polarized antenna in prior art;
Fig. 4 is the structural representation of broad beam circular polarization Yagi spark gap-microstrip antenna of the present invention;
Fig. 5 is the feed network structures schematic diagram of the broad beam circular polarization Yagi spark gap-microstrip antenna of the embodiment of the present invention;
Fig. 6 is the broadband resonance characteristic figure of Yagi spark gap-microstrip antenna of the present invention;
Fig. 7 is the broadband circular polarization 3dB axial ratio figure of Yagi spark gap-microstrip antenna of the present invention;
Fig. 8 is the 3dB axial ratio circularly polarised wave beam width that Yagi spark gap-microstrip antenna of the present invention is operated in the L1 frequency range of gps system;
Fig. 9 is the half-power beam width that Yagi spark gap-microstrip antenna of the present invention is operated in the L1 frequency range of gps system;
Figure 10 is the cross polarization situation that Yagi spark gap-microstrip antenna of the present invention is operated in the L1 frequency range of gps system;
Wherein, 1 and 2 is medium substrate, and 3 is square-shaped radiation paster, and 4,5,6 is micro-strip oscillator, and 7 and 8 is the distributing point of square patch, and 9 is feeding network, and 10 is the input of feeding network, and 11 and 12 is the output of feeding network.
Embodiment
Below in conjunction with drawings and Examples, technical scheme of the present invention is described in detail.
Embodiment
Broad beam circularly polarization microstrip-Yagi antenna that the present embodiment provides, its structure as shown in Figure 4, Figure 5, comprise medium substrate 1, medium substrate 2, ground plate, square-shaped radiation paster 3, micro-strip oscillator group and feeding network, ground plate is between medium substrate 1 and medium substrate 2, and ground plate contacts with feed port outer conductor; Radiation patch 3 is positioned at the upper surface of dielectric substrate 1, and micro-strip oscillator group comprises micro-strip oscillator 4,5,6; Square patch 3 is positioned at the center of described dielectric substrate 1 upper surface, and the external side parallel on its every bar limit is provided with a micro-strip oscillator group, and described micro-strip oscillator group is three and is parallel to each other and the micro-strip oscillator that reduces gradually from the inside to the outside of length; Square patch 3 has two feed port, and square patch 3 is as excitation paster, and micro-strip oscillator 4,5,6 is as parasitic a period of time; In each micro-strip oscillator group, the middle perpendicular bisector of micro-strip oscillator overlaps with the perpendicular bisector of the corresponding square patch length of side, and distance between adjacent micro-strip oscillator and the longest micro-strip oscillator all equal with the distance at square patch edge.
By square patch 3 as excitation paster, 12 symmetrical rings around the micro-strip oscillator of square patch 3 surrounding as parasitic a period of time, the length in parasitic a period of time reduces gradually, be similar to the director in Yagi antenna, Yagi spark gap-microstrip antenna the size of the present embodiment is little, and the pattern beamwidth that can realize is wide.
Further, two diagonals of square patch 3 have respectively the groove of a rectangle, two grooves are orthogonal, thus combine the criss-cross groove of formation.
Further, square patch 3 has two feed port, and square patch 3 is as excitation paster, and 12 micro-strip oscillators do not have feed port, and it is as parasitic a period of time.The distributing point 7 of excitation paster, 8 orthogonal, two distributing point places are connected with the feeding network 9 of medium substrate 2 lower surface respectively.The phase difference encouraged between distributing point 7 and 8 is 90 °, and excitation amplitude is equal.In the outside of distributing point 7 and 8, have the groove of an annular respectively, the inside and outside footpath of two annulus is equal respectively.
The feeding network of broad beam circular polarization Yagi spark gap-microstrip antenna that the present embodiment provides is positioned at the lower surface of described medium substrate 2, and its structure as shown in Figure 5; This feeding network adopts traditional Wilkinson power divider structure, and two output 11,12 runs through the metal column of medium substrate 1,2 and two of described square-shaped radiation paster respectively by one to be presented and a little 7,8 to be connected.
By being connected with the input 10 of feeding network 9 by inner wire probe coaxial for feed, the coaxial outer conductor of feed is connected with ground plate, can carry out feed to feeding network 9.Two output ports 11 of feeding network are connected with 8 with two distributing points 7 of the square patch 3 of medium substrate 1 upper surface center respectively with 12, thus have encouraged the circular polarization radiation ripple of square patch 3.Be positioned at the micro-strip oscillator of square patch four edges outside each by the coupling with square patch, its surface produces induced current, thus has encouraged electromagenetic wave radiation.The greatest irradiation direction of square patch is straight up, the directional diagram of micro-strip oscillator in perpendicular is omni-directional pattern, belong to its greatest irradiation direction, pass through coupling, the electromagnetic wave that square patch can be made to encourage to radiation in whole perpendicular, thus makes the beamwidth of this antenna obtain broadening.
Fig. 6 gives the resonance characteristic of this antenna, and its working band is 1.13GHz-2.00GHz, and impedance bandwidth is 55.6%.Can be obtained the axial ratio bandwidth of this antenna by Fig. 7, frequency bandwidth when its axial ratio is less than 3dB is 1.17GHz-1.95GHz, and axial ratio bandwidth is 50.0%.In conjunction with impedance bandwidth and the axial ratio bandwidth of this antenna, can draw, its bandwidth range covers the B1 frequency range of the L1 frequency range of gps system, E1 and the E2 frequency range of Galileo system, the L1 frequency range of GLONASS system and Compass system, as shown in table 1.
The working frequency range that the antenna that table 1 the present embodiment provides can cover
| Navigation mode | Frequency band range (MHz) |
| GPS | L1：1575.42±10 |
| Galileo | E1：1587-1591 E2：1559-1563 |
| GLONASS | L1：1602+0.5625×k(k＝1-24) |
| Compass | B1：1561.098±10.23 |
In fig. 8, the situation that the axial ratio giving the L1 frequency range of this Yagi spark gap-microstrip antenna at gps system changes with the angle of pitch.By Tu Ke get, when the axial ratio of antenna is less than 3dB, its beamwidth is respectively 176 ° and 137 ° in two primary flats, has wider beamwidth.Fig. 9 gives the beamwidth of this antenna in two primary flats.Gone out by figure observable, the beamwidth of this antenna in two primary flat XOZ faces and YOZ face all reaches 100 °, and gain is 3.37dB.Figure 10 gives the cross polarization situation of this antenna in two primary flats.Shown by Figure 10 (a) and Figure 10 (b), this antenna has good cross polarization characteristics in two primary flats.This Yagi spark gap-microstrip antenna is emulated respectively on all the other each working frequency range, draws its operating characteristic concrete in each frequency range, as shown in table 2.
From above result, broad beam circular polarization Yagi spark gap-microstrip antenna provided by the invention is under different operating frequency, and its beamwidth remains unchanged substantially, and circular polarization characteristics is good; Compared with other wide-beam circularly-polarizedmicrostrip microstrip antenna, it can provide wider bandwidth, and this characteristic can be applied in multimodal satellite navigation system.This antenna size is little, and section is low, is easy to processing, with low cost.
The operating characteristic that table 2 antenna provided by the invention is concrete in each frequency range respectively
Claims (3)
1. broadband and wide wave beam circular polarization Yagi spark gap-microstrip antenna, comprises medium substrate, square-shaped radiation paster and grounding plate, and described square-shaped radiation paster is positioned at described medium substrate upper surface, and described grounding plate is positioned at described medium substrate lower surface; Described antenna adopts the coaxial orthogonal feed of dual-port, described two coaxial feed ports amplitude when feed is equal, phase difference is 90 °, thus realize circular polarization radiation, it is characterized in that, also comprise the micro-strip oscillator group that four groups of structures being positioned at described medium substrate upper surface are identical, described four groups of micro-strip oscillator groups lay respectively at outside four sides of described square-shaped radiation paster, and each micro-strip oscillator group is formed by more than two the micro-strip oscillator parallel arrangements that length reduces gradually from the inside to the outside.
2. broadband and wide wave beam circular polarization Yagi spark gap-microstrip antenna according to claim 1, it is characterized in that, the center of described square-shaped radiation paster is provided with a cross bath, and the both sides of described cross bath overlap with two diagonal of square-shaped radiation paster respectively.
3. broadband and wide wave beam circular polarization Yagi spark gap-microstrip antenna according to claim 1, is characterized in that, each feedback point on described square-shaped radiation paster is outer is respectively arranged with a cannelure, and feedback point is positioned at corresponding cannelure.
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| CN106299661A (en) * | 2016-09-19 | 2017-01-04 | 中国电子科技集团公司第二十研究所 | A kind of miniaturization navigation reception antenna |
| CN107104278A (en) * | 2017-04-26 | 2017-08-29 | 山西大学 | It is a kind of that there is wide axle in pitching face than the low section omnidirectional circular-polarized antenna of wave beam |
| CN107275807A (en) * | 2017-06-22 | 2017-10-20 | 昆山睿翔讯通通信技术有限公司 | A kind of communication terminal structure of integrated millimeter wave antenna and navigation antenna |
| CN107732459A (en) * | 2017-08-16 | 2018-02-23 | 电子科技大学 | A kind of miniaturization paster antenna |
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| CN108232432A (en) * | 2017-12-05 | 2018-06-29 | 华南理工大学 | A kind of single feedback broadband low section circular polarization microstrip antenna |
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| CN108232432A (en) * | 2017-12-05 | 2018-06-29 | 华南理工大学 | A kind of single feedback broadband low section circular polarization microstrip antenna |
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| CN109687116A (en) * | 2019-02-01 | 2019-04-26 | 桂林电子科技大学 | The minimized wide-band wide-beam circularly-polarizedmicrostrip microstrip antenna of C-band |
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| CN110828996A (en) * | 2019-11-19 | 2020-02-21 | 中国地质大学（北京） | Butterfly antenna assembly |
| CN111029738A (en) * | 2019-11-28 | 2020-04-17 | 西安电子科技大学 | Wide-beam microstrip antenna based on hybrid loading |
| CN111048891A (en) * | 2019-12-02 | 2020-04-21 | 中国舰船研究设计中心 | Miniature combined microstrip-symmetric array double-frequency antenna |
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Application publication date: 20150902 |