CN105811099A - Small satellite navigation antenna and anti-multipath interference cavity thereof - Google Patents
Small satellite navigation antenna and anti-multipath interference cavity thereof Download PDFInfo
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- CN105811099A CN105811099A CN201610256876.1A CN201610256876A CN105811099A CN 105811099 A CN105811099 A CN 105811099A CN 201610256876 A CN201610256876 A CN 201610256876A CN 105811099 A CN105811099 A CN 105811099A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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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
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
- H01Q13/106—Microstrip slot antennas
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Abstract
The invention discloses a small satellite navigation antenna and an anti-multipath interference cavity thereof. A radiation substrate is arranged on the small satellite navigation antenna and the anti-multipath interference cavity thereof, wherein the radiation substrate is a printed circuit board and is provided with four fan-shaped small radiation fins; a feed drum is arranged at the lower part of the radiation substrate; a feed network substrate is arranged at the lower part of the feeding drum; four triangular feed tabs are adopted for feeding the fan-shaped small radiation fins on the feed drum; the feed network substrate is the printed circuit board; a series feeder line is arranged on the upper surface of the feed network substrate; the anti-multipath interference cavity is located on the periphery of the feed network substrate; and a metal floor is arranged on the lower surface of the feed network substrate. The fan-shaped small radiation fins, the triangular feed tabs and the small series feeder line are adopted; meanwhile, small size, wide band and high efficiency of the satellite navigation antenna are simultaneously achieved; meanwhile, the anti-multipath interference cavity can solve the problem of anti-multipath interference of the satellite navigation antenna from the horizontal plane under the small size.
Description
Technical field
The invention belongs to technical field of satellite navigation, particularly relate to a kind of grapefruit satellite navigation antenna and anti-multipath jamming cavity thereof.
Background technology
Satellite Navigation Technique refers to the technology adopting aeronautical satellite that ground, ocean, aerial and spatial user are navigated location.GPS currently mainly includes four kinds: the Beidou satellite navigation system of the global positioning system of the U.S., the Galileo system of European Union, Muscovite glonass system and China.Along with the development trend of the miniaturization of navigator, portability, the navigation antenna of mobile navigation terminal is also constantly proposed requirements at the higher level, small size, high-performance and anti-interference be the target of development.It is known that antenna also exists contradiction between its size and performance, reducing of antenna size often will with sacrificial section performance for cost.And navigation antenna exigence obtains better circular polarisation performance and higher efficiency under small size.Meanwhile, one of the multi-path jamming also task of being always up navigation antenna that antagonism is reflected from level ground.Therefore, the problem in order to solve these restriction navigation antenna development, it is necessary to propose novel satellite navigation aerial technology.Traditional satellite navigation aerial form includes: four-arm spiral antenna, decussation antenna and microstrip antenna.Four-arm spiral antenna is the circular polarized antenna of a kind of function admirable, its simple in construction, it is easy to manufacture, but its antenna height is big, and minimum is 0.25 λ, even if by measure minifications such as coated by dielectric, antenna height is also difficult to less than 0.1 λ, and will to sacrifice antenna efficiency and bandwidth for cost.Decussation antenna is to adopt two orthogonally located half-wave dipoles, and feedback realizes with the excitation of constant amplitude and phase quadrature, this antenna structure is simple, but must be placed at metal floor could realize one-way radiation, therefore antenna height is generally 0.25 λ～0.5 λ, and the diameter of metal floor also to reach 0.5 λ, if reducing antenna height, to there is severe exacerbation in antenna radiation pattern, impedance matching is also extremely difficult.Microstrip antenna is a kind of low profile antenna, has inborn ceiling advantage, is generally highly both less than 0.1 λ, is well suited for the application of mobile vehicle.But the lateral dimension of microstrip antenna is big, being generally 0.5 λ～0.8 λ, for that reduce antenna and lateral dimension, industry is frequently with the microwave material of high-k, while adding production cost, the beamwidth of antenna also can degradation, antenna efficiency also can reduce.Therefore, how solving these problems is the key that microstrip antenna is applied to satellite navigation.Additionally, the radianting capacity that microstrip antenna is in the horizontal direction is very weak, circular polarisation performance is also undesirable so that the anti-multipath jamming ability of antenna is very weak, to solve this problem it is necessary to increase extra suppression floor panel structure.At present, existing measure includes the floor panel structure of several deformation, there are chokes ring floor, non-cut-off corrugated floor, Filled Dielectrics chokes ring floor, electro-magnetic bandgap floor and four-bladed vane reflector, these floor panel structures can reduce the circular polarized antenna cross polarization at low elevation direction in various degree, but their size is all excessively huge simultaneously, wherein smallest size of is four-bladed vane reflector, its overall dimensions has also reached 0.777 λ × 0.123, λ × 0.777 λ, is not well positioned to meet the satellite navigation demand of small-sized movable carrier.Therefore, need badly and develop the small size anti-multipath jamming floor being suitable for grapefruit satellite navigation antenna.
There is simple in construction in traditional satellite navigation aerial, the microstrip antenna lateral dimension of employing is big, and radianting capacity in the horizontal direction is very weak, and circular polarisation performance is also undesirable so that the anti-multipath jamming ability of antenna is very weak.
Summary of the invention
It is an object of the invention to provide a kind of grapefruit satellite navigation antenna and anti-multipath jamming cavity thereof, aim to solve the problem that traditional satellite navigation aerial contradiction between size and performance, satellite navigation circular polarized antenna circular polarization radiation characteristic can be improved under small size, improve radiation efficiency and bandwidth of operation, strengthen the anti-multipath jamming ability of antenna.
The present invention is achieved in that a kind of grapefruit satellite navigation antenna and anti-multipath jamming cavity thereof, and described grapefruit satellite navigation antenna and anti-multipath jamming cavity thereof are provided with radiation substrate, and described radiation substrate is printed circuit board (PCB), have four little radiation fins of sector；Described radiation substrate be arranged below feed cylinder；Described feed cylinder be arranged below feeding network substrate, on described feed cylinder adopt four triangle feed tab be fan-shaped little radiating patch；Feeding network substrate is printed circuit board (PCB), and the upper surface of described feeding network substrate is series feed line, and anti-multipath jamming cavity is positioned at the periphery of feeding network substrate；The lower surface of described feeding network substrate is metal floor.
Further, the little radiation fin centrosymmetry distribution of described four sectors, four little radiation fins of sector adopt four constant amplitudes and phase quadrature source forcing.
Further, the small-sized series feed line adopting non-resistance provides circular polarisation feed for antenna；
The center of described series feed line connects feed port, and on described series feed line, the position at a distance of 1/4th medium wavelength draws four connectivity ports successively；
Described four connectivity ports are connected with the lower end of described triangle feed tab respectively.
Further, the extension of described anti-multipath jamming cavity adopts meander line shape to constitute.
Further, described feeding network substrate be arranged below radio-frequency joint, radio-frequency joint is connected with the distributing point on feeding network substrate；
The inner core of described radio-frequency joint, through the dielectric layer of described feeding network substrate, is connected with series feed line center, and the crust of described radio-frequency joint is connected with described metal floor.
Further, described feed cylinder is flexible printed circuit board, with four triangle feed tab on barrel.
Further, the upper end of described four triangle feed tab is connected with described four little radiation fins of sector respectively.
Further, there are short-circuit minor matters at the middle part of described triangle feed tab, and described short circuit minor matters are connected with metal floor.
Grapefruit satellite navigation antenna provided by the invention and anti-multipath jamming cavity thereof, compared with prior art, the micro-strip radiation fin of the present invention adopts the little radiation fin composition of sector of four centrosymmetry distributions, when four little radiation fins of sector adopt the source forcing of four constant amplitudes and phase quadrature, it is possible to the normal direction at aerial radiation sheet obtains good circular polarization radiation；Gap between four little radiation fins of sector is only small, there is strong coupling therebetween, when changing the width in this gap, when antenna shapes size constancy, can substantially change the resonant frequency of antenna, experiments show that resonant frequency can significantly reduce when gap reduces, thus reducing the electric size of antenna.Including floor, the representative diameter of whole antenna is 0.25 λ, and antenna thickness is less than 0.07 λ, and this antenna size is significantly less than conventional circular polarization microstrip antenna, and the half-power beam width of antenna also reaches 110 °.Reducing due to antenna size and introduce coupled structure, the quality factor q of antenna can raise, and the bandwidth of operation of antenna can reduce, and is unfavorable for the use of small circularly-polarizedantenna antenna.Present invention employs feed barrel structure and can improve the bandwidth of operation of antenna, adopting four triangle feed tab on feed cylinder is fan-shaped little radiating patch, triangle feed tab has the gradual characteristic of impedance, the input impedance that can make fan-shaped little radiation fin rises and falls and slows down, and is effectively increased the bandwidth of operation of antenna.Meanwhile, the short-circuit minor matters on triangle radiation fin can introduce new zeroth order resonance point, improves the input impedance characteristic of antenna, thus solving the resistance matching problem of small size antenna.Traditional circular polarization microstrip antenna, when not using resistive element, the beamwidth of antenna only has 5%, and the impedance bandwidth of inventive antenna can reach 19.2%, and axial ratio bandwidth can reach 8.7%.In order to solve the problem of small circularly-polarizedantenna antenna inefficiency, the present invention adopts the small-sized series feed line of non-resistance to provide circular polarisation feed for antenna.Conventional circular polarization microstrip antenna adopts power splitter or network of electrical bridge feed, and it comprises isolation resistance or absorption resistance etc. consumption element, although the use of these networks can increase the beamwidth of antenna, but it is to sacrifice antenna efficiency for cost.This is very unfortunate for satellite navigation aerial, because satellite-signal is generally all very faint, it is necessary to high efficiency antenna is accepted and amplifies, and antenna efficiency and gain are of great rarity.The compact conformation of small-sized series feed line, bandwidth, owing to not having the participation of resistance, feed efficiency is greatly improved, and antenna integral radiation efficiency can be made to reach more than 95%.The present invention includes a kind of small-sized anti-multipath jamming cavity, and the height of cavity is very low, it is possible to identical with satellite navigation aerial height, and cavity diameter is less than 0.45 λ.The extension of cavity adopts meander line shape to constitute, folding line structure can improve merit proportion by subtraction and the phase contrast of horizontal direction electromagnetic wave pairwise orthogonal component, make merit proportion by subtraction close to 1, phase contrast is close to 90 °, thus improving the satellite navigation aerial circular polarization characteristics at low elevation direction, and suppress antenna in the cross polarization of low elevation direction, reach the good purpose to anti-multipath jamming.
In sum, owing to have employed fan-shaped little radiation fin, triangle feed tab and small-sized series feed line, therefore, inventive antenna is simultaneously achieved the small size of satellite navigation aerial, broadband and high efficiency, simultaneously, anti-multipath jamming cavity under small size, can solve the satellite navigation aerial multi-path jamming problem from horizontal plane.
Accompanying drawing explanation
Fig. 1 is grapefruit satellite navigation antenna and the anti-multipath jamming cavity body structure schematic diagram thereof of embodiment of the present invention offer.
Fig. 2 is the grapefruit satellite navigation antenna that provides of the embodiment of the present invention and the grapefruit satellite navigation antenna exploded view of anti-multipath jamming cavity thereof.
Fig. 3 is the grapefruit satellite navigation antenna that provides of the embodiment of the present invention and the anti-multipath jamming cavity body structure figure of anti-multipath jamming cavity thereof.
Fig. 4 is the grapefruit satellite navigation antenna that provides of the embodiment of the present invention and the feeding network substrate top view of anti-multipath jamming cavity thereof.
Fig. 5 is the grapefruit satellite navigation antenna that provides of the embodiment of the present invention and the side cross-sectional, view of anti-multipath jamming cavity thereof.
Fig. 6 is the voltage standing wave ratio curve chart of the antenna that the embodiment of the present invention provides.
Fig. 7 is axle ratio and the radiation efficiency curve figure of the antenna that the embodiment of the present invention provides.
Fig. 8 is the antenna of embodiment of the present invention offer pitching face directional diagram when with or without anti-multipath jamming cavity.
Fig. 9 is that the antenna of embodiment of the present invention offer pitching over glaze when with or without anti-multipath jamming cavity compares directional diagram.
Figure 10 is the gain curve figure of the antenna that the embodiment of the present invention provides.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.
Below in conjunction with accompanying drawing, the application principle of the present invention is explained in detail.
Refer to Fig. 1～Fig. 5, one grapefruit satellite navigation antenna of the present invention and anti-multipath jamming cavity thereof, it includes radiation substrate 1, and radiation substrate 1 is positioned at the superiors of antenna, and radiation substrate 1 adopts printed circuit technology manufacture, with four little radiation fins 101 of sector on it；Feed cylinder 2, feed cylinder 2 is positioned at the lower section of radiation substrate 1, and is connected with radiation substrate 1, and feed cylinder 2 adopts flexible printed circuit board manufacture, with four triangle feed tab 201 on its barrel, the upper end of four triangle feed tab 201 is connected with the described little radiation fin 101 of four sectors respectively；There are short-circuit minor matters 202 at the middle part of triangle feed tab 201, and short circuit minor matters 202, through the dielectric layer of feeding network substrate 3, are connected with metal floor 304；Feeding network substrate 3, feeding network substrate 3 is positioned at the lower section of feed cylinder 2, it is connected with feed cylinder 2, feeding network substrate 3 adopts printed circuit technology manufacture, the upper surface of feeding network substrate 3 is series feed line 301, and lower surface is metal floor 304, and the center of series feed line 301 connects feed port 302, be separated by the series feed line position of 1/4th medium wavelength draws four connectivity ports 303 successively, and four connectivity ports 303 are connected with the lower end of triangle feed tab 202 respectively；Anti-multipath jamming cavity 4, anti-multipath jamming cavity 4 is positioned at the periphery of feeding network base 3, and bottom surface 401 and the metal floor 304 of anti-multipath jamming cavity 4 fit tightly, and anti-multipath jamming cavity 4 is metal material, the cross sectional shape of anti-multipath jamming cavity 4 is folding line 402, and the number of times of bending is twice；Radio-frequency joint 5, radio-frequency joint 5 is positioned at the lower section of feeding network substrate 4, through the through hole 403 at anti-multipath jamming cavity 4 center, the dielectric layer of the inner core traverse feeding network substrate of radio-frequency joint 5, being connected with series feed line 301 center, the crust of radio-frequency joint 5 is connected with metal floor 304.
There is strong coupling in the gap between four little radiation fins of sector 101, the width changing gap can substantially change the resonant frequency of antenna, experiments show that when gap width is 2～6mm, it is possible to obtain very low resonant frequency, thus being substantially reduced the electric size of antenna.
Four triangle feed tab 201 are the gradual structure of impedance, and its upper end is connected with four little radiation fins 101 of sector and constitutes an entirety, thus improving the input impedance flatness of four little radiation fins 101 of sector, provide the foundation for increasing antenna operating band.
During the correct position that short circuit minor matters 202 are positioned in the middle part of triangle feed tab 201, it is possible to solve the resistance matching problem of small size antenna, experiments show that short circuit minor matters 202 apart from the distributing point of triangle feed tab 201 be 12～18mm time, antenna match is good.
The effect of anti-multipath jamming cavity 4 is that circular polarisation improves device, when non-circularly polarised wave is transferred to MPI suppression cavity, the pairwise orthogonal component of non-circularly polarised wave will be modulated again, the amplitude making pairwise orthogonal component is close, phase contrast is close to 90 °, the outgoing wave making MPI suppression cavity has good circular polarization characteristics, reaches to suppress the cross-polarized purpose of low elevation direction.
The work process of inventive antenna is such, when launching signal, when pumping signal is sent into from the feed port 302 series feed line 301, electric current transmits along series feed line, through energy distribution and Phase delay, the signal being divided into four tunnel constant amplitude phase quadratures exports from four connectivity ports 303, electric current is sent into the lower end of four triangle feed tab 201 by four connectivity ports 303 again, electric current flows to four little radiation fins 101 of sector along triangle feed tab, four little radiation fins of sector outwards radiate after interacting, form the circularly polarised wave of vertical direction, the radiated wave of horizontal direction becomes desirable circularly polarised wave through anti-multipath jamming cavity 4, so far desirable circularly polarised wave is all obtained at whole upper half-space.When receiving signal, process is contrary with when launching, and radiated wave is injected from the periphery of four little radiation fins 101 of sector and anti-multipath jamming cavity 4, finally converges into a road and exports from feed port.
Multinomial technology common implementing, can make the thickness of satellite navigation aerial less than 0.07 λ, and diameter is less than 0.25 λ, and anti-multipath jamming cavity diameter is less than 0.45 λ, and antenna also has the feature of high efficiency, broadband, broad beam and anti-multipath jamming simultaneously.
Below in conjunction with emulation, the application effect of the present invention is explained in detail.
1, emulation content
Utilize electromagnetic simulation software that the voltage standing wave ratio of above-described embodiment antenna, axle ratio, directional diagram and gain have been emulated, refer to Fig. 6 to Figure 10.
2, simulation result
Fig. 6 is the curve that the voltage standing wave ratio that the emulation of embodiment antenna is obtained changes with operating frequency.It can be seen that voltage standing wave ratio≤2 range for 1.084～1.314GHz, mid frequency 1.199GHz, absolute bandwidth 230MHz.Result of calculation show inventive antenna can in the relative bandwidth of 19.2% matched well, small-sized microstrip antenna belongs to broadband character, this characteristic can meet the demand of satellite navigation working frequency range.
Fig. 7 is the curve that the embodiment antenna normal direction axle ratio that obtains of emulation and radiation efficiency are changed with operating frequency.From figure 7 it can be seen that the axle ratio≤3dB's of inventive antenna ranges for 1.143～1.247GHz, mid frequency 1.195GHz, absolute bandwidth 104MHz.Result of calculation shows that inventive antenna can keep good circular polarisation in the relative bandwidth of 8.7%, it is possible to meet the working band requirement of satellite navigation.From efficiency curve it can be seen that in this frequency band, the radiation efficiency of antenna is more than 95%.Antenna, under small size, can obtain such circular polarisation bandwidth, also has high radiation efficiency simultaneously, is very excellent antenna performance, it is possible to promotes the signal quality of satellite navigation, improves the sensitivity that signal receives.
Embodiment antenna is emulated the pitching face directional diagram obtained by Fig. 8.Figure includes the grapefruit satellite navigation antenna main polarization and Cross polarization pattern when with or without anti-multipath jamming cavity.From figure it can be seen that the 3dB beam angle of inventive antenna reaches 110 °, anti-multipath jamming cavity on main polarization directional diagram almost without impact.And cross polarization is very big by the impact of anti-multipath jamming cavity, cross polarization is obtained for improvement in the total space, especially improves clearly at upper half-space.Time in the horizontal direction, cross polarization level drops to-26.1dB from-10.5dB, and improvement amount reaches 15.6dB.The reduction of cross polarization level can substantially suppress to come from the multi-path jamming of ground return, improves the capacity of resisting disturbance of satellite navigation aerial, thus increasing substantially the quality of reception of navigation signal.
Fig. 9 is that the pitching over glaze that the emulation of embodiment antenna is obtained compares directional diagram.Figure includes grapefruit satellite navigation antenna axle when with or without anti-multipath jamming cavity and compares directional diagram.Can be seen that from figure, inventive antenna axle under the effect of anti-multipath jamming cavity dramatically increases than beam angle, 192 ° (± 96 °) are increased to from 106 ° (± 53 °) before, therefore antenna is in the scope of θ=53 °～96 °, and circular polarization characteristics is significantly improved.Good circular polarization characteristics shows that the polarization purity of antenna is high, it is possible to satellite navigation aerial reception at low elevation direction is greatly improved.Aeronautical satellite upper half-space probability of occurrence at the earth's surface is close, and the improvement of low elevation angle circular polarisation performance can more make full use of the satellite-signal from near-earth direction, and the performance of satellite navigation will be strengthened.
Figure 10 is that the gain that the emulation of embodiment antenna is obtained is with frequency variation curve.It can be seen that in whole frequency band, the change of gain is all relatively flat from figure, this is the benefit brought by series feed network.In the working band of 1.143～1.247GHz, main polarization gain is above 4.9dBic, and maximum reaches 5.2dBic.This gain, higher than traditional grapefruit satellite navigation antenna gain, is conducive to receiving the amplification of signal, improves system signal noise ratio.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all any amendment, equivalent replacement and improvement etc. made within the spirit and principles in the present invention, should be included within protection scope of the present invention.
Claims (8)
1. a grapefruit satellite navigation antenna and anti-multipath jamming cavity thereof, it is characterised in that described grapefruit satellite navigation antenna and anti-multipath jamming cavity thereof are provided with radiation substrate, and described radiation substrate is printed circuit board (PCB), has four little radiation fins of sector；Described radiation substrate be arranged below feed cylinder；Described feed cylinder be arranged below feeding network substrate, on described feed cylinder adopt four triangle feed tab be fan-shaped little radiating patch；Feeding network substrate is printed circuit board (PCB), and the upper surface of described feeding network substrate is series feed line, and anti-multipath jamming cavity is positioned at the periphery of feeding network substrate；The lower surface of described feeding network substrate is metal floor.
2. grapefruit satellite navigation antenna as claimed in claim 1 and anti-multipath jamming cavity thereof, it is characterised in that symmetrical centered by described four little radiation fins of sector, four little radiation fins of sector adopt four constant amplitudes and phase quadrature source forcing.
3. grapefruit satellite navigation antenna as claimed in claim 1 and anti-multipath jamming cavity thereof, it is characterised in that adopt the small-sized series feed line of non-resistance to provide circular polarisation feed for antenna；
The center of described series feed line connects feed port, and on described series feed line, the position at a distance of 1/4th medium wavelength draws four connectivity ports successively；
Described four connectivity ports are connected with the lower end of described triangle feed tab respectively.
4. grapefruit satellite navigation antenna as claimed in claim 1 and anti-multipath jamming cavity thereof, it is characterised in that the extension of described anti-multipath jamming cavity adopts meander line shape to constitute.
5. grapefruit satellite navigation antenna as claimed in claim 1 and anti-multipath jamming cavity thereof, it is characterised in that described feeding network substrate be arranged below radio-frequency joint, radio-frequency joint is connected with the distributing point on feeding network substrate；
The inner core of described radio-frequency joint, through the dielectric layer of described feeding network substrate, is connected with series feed line center, and the crust of described radio-frequency joint is connected with described metal floor.
6. grapefruit satellite navigation antenna as claimed in claim 1 and anti-multipath jamming cavity thereof, it is characterised in that described feed cylinder is flexible printed circuit board, with four triangle feed tab on barrel.
7. grapefruit satellite navigation antenna as claimed in claim 1 and anti-multipath jamming cavity thereof, it is characterised in that the upper end of described four triangle feed tab is connected with described four little radiation fins of sector respectively.
8. grapefruit satellite navigation antenna as claimed in claim 1 and anti-multipath jamming cavity thereof, it is characterised in that there are short-circuit minor matters at the middle part of described triangle feed tab, and described short circuit minor matters are connected with metal floor.
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| CN201610256876.1A CN105811099A (en) | 2016-04-22 | 2016-04-22 | Small satellite navigation antenna and anti-multipath interference cavity thereof |
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| CN108232463B (en) * | 2018-02-28 | 2024-02-27 | 中国人民解放军国防科技大学 | Choke coil for satellite navigation measurement type antenna |
| CN109244662A (en) * | 2018-09-06 | 2019-01-18 | 广东博纬通信科技有限公司 | A kind of antenna radiation unit applying to 5G system |
| CN109244662B (en) * | 2018-09-06 | 2024-05-31 | 广东博纬通信科技有限公司 | Antenna radiation unit applied to 5G system |
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| WO2020128096A1 (en) | 2018-12-21 | 2020-06-25 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Antenna device |
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| CN112688070A (en) * | 2020-12-21 | 2021-04-20 | 西安电子科技大学 | Distributed multi-point feed broadband vertical polarization omnidirectional antenna |
| CN114069239A (en) * | 2021-11-14 | 2022-02-18 | 中国电子科技集团公司第五十四研究所 | Broadband stable wide beam cavity oscillator antenna |
| CN114069239B (en) * | 2021-11-14 | 2024-01-30 | 中国电子科技集团公司第五十四研究所 | Broadband stable wide-beam cavity element antenna |
| CN114552221A (en) * | 2022-02-25 | 2022-05-27 | 南京邮电大学 | Circularly polarized cavity antenna capable of improving directivity |
| CN114552221B (en) * | 2022-02-25 | 2023-12-12 | 南京邮电大学 | Circular polarization cavity antenna capable of improving directivity |
| WO2023159981A1 (en) * | 2022-02-25 | 2023-08-31 | 南京邮电大学 | Circularly polarized cavity antenna having improved directivity |
| US11715879B1 (en) | 2022-06-20 | 2023-08-01 | Anhui University | Multi-layer low-profile four-arm spiral antenna |
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Application publication date: 20160727 |