CN109387860B - Stepped ground structure for improving phase stability of antenna - Google Patents
Stepped ground structure for improving phase stability of antenna Download PDFInfo
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- CN109387860B CN109387860B CN201811477690.4A CN201811477690A CN109387860B CN 109387860 B CN109387860 B CN 109387860B CN 201811477690 A CN201811477690 A CN 201811477690A CN 109387860 B CN109387860 B CN 109387860B
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- 239000000758 substrate Substances 0.000 claims description 59
- 230000005855 radiation Effects 0.000 claims description 6
- 238000002955 isolation Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 19
- 238000004088 simulation Methods 0.000 description 5
- 239000002356 single layer Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Waveguide Aerials (AREA)
Abstract
The invention discloses a stepped ground structure for improving the phase stability of a navigation antenna, which is characterized in that the integral structure consists of a circularly polarized antenna unit and a stepped ground structure, and the phase stability of the navigation antenna with poor phase stability is greatly improved through the loading of the stepped ground structure; aiming at the defect of low phase stability of the traditional navigation antenna, an effective solution is provided.
Description
Technical Field
The invention relates to the technical field of application of antennas with high requirements on phase stability in satellite navigation systems, in particular to a stepped structure for improving the phase stability of an antenna.
Background
The global satellite navigation system (Global Navigation SATELLITE SYSTEM, GNSS) is an air-based radio navigation positioning system that provides real-time location information to a user at the surface of the earth or near-earth space. Currently, there are mainly four global satellite navigation systems, GPS (united states), GLONASS (russia), GALILEO (european union) and beidouu (china), respectively. Each navigation system is capable of providing all-weather three-dimensional coordinates, speed and time information to a user at any location on the earth's surface or near-earth space. The method has the characteristics of omnibearing, all-weather, full period and high precision. Is a complex combination system of multiple systems, multiple levels and multiple modes. The global satellite navigation system is widely applied to the fields of geographic data acquisition, geodetic survey, resource investigation, earth crust movement, cadastral survey and engineering survey, vehicle monitoring and scheduling and navigation service, naval navigation, military use, time synchronization and the like. The antenna is an important component of a high-precision receiver of a satellite navigation system, and its performance is directly related to the positioning precision. The satellite navigation system measures that the receiver is required to track a plurality of satellites simultaneously when in operation, and the elevation angle and the azimuth angle of each satellite are different, so that the phase center of the receiving antenna can be changed along with the elevation angle, the azimuth angle and the antenna form of different satellite signals. When the receiving antenna performs positioning observation on a plurality of satellites, errors caused by phase center changes can be introduced. The phase center stability of the antenna and multipath effects are significant sources of error in high precision measurement systems. The phase center of the antenna is assumed to be an ideal point source, and the equal phase surface of the antenna is a spherical surface, so that the position of the spherical center, i.e. the point source, is the phase center of the antenna. For a complete description of the antenna phase center characteristics, concepts of average phase center, phase center offset PCO, and phase center variation PCV are introduced. The average phase center refers to the average phase center of the antenna if the actual equiphase surfaces of the far field in the whole antenna beam space are fitted by ideal equiphase spheres, and the square sum of fitting residuals is the smallest. The phase center offset refers to the offset of the average phase center from the antenna reference point. The phase center variation refers to the offset of the actual equiphase surface from the fitted sphere. The phase center of the receiver antenna is neither the antenna geometry center nor a stable point, but is related to factors such as the incident signal elevation, azimuth, and antenna form. The observed quantity of the antenna of the satellite navigation receiver needs to take the phase center point as a reference point, and when a worker works, the antenna is installed by generally defaulting the geometric center of the antenna to be the phase center, so that the phase center is not found to bring phase errors. In practice the antenna does not have a unique phase center throughout the beam space, but only the phase remains relatively stable within a certain range of the main beam. Thus, when signals in different directions are received, a phase error is introduced, and the phase error causes deviation of measurement results. Therefore, the research on the highly stable phase center antenna is important in practical significance to reduce deviation of the antenna in a measurement result caused by phase errors.
The grant publication number CN 104868235B discloses a multi-layer antenna structure and an antenna, which solves the technical problem that the antenna cannot meet both performance and thickness requirements, and does not solve the technical problem in the background art.
Disclosure of Invention
The invention aims to provide a ladder ground structure capable of improving the phase stability of an antenna of a navigation system, and the phase stability of the antenna is greatly improved by loading the ladder ground structure on the antenna with poor phase stability; the technical problem of low antenna phase stability in a navigation system is solved.
The utility model provides an improve ladder ground structure of antenna phase stability, includes radiation paster, dielectric layer, feed network, ground plate and ladder ground, the dielectric layer is formed through the fix with screw by multilayer dielectric substrate, and the dielectric layer is installed ladder overground top, the dielectric layer top sculpture has the radiation paster, the below sculpture the ground plate, the inside sculpture feed network of dielectric layer.
Based on the technical scheme, the invention can also be improved as follows:
Further, the dielectric substrate comprises a first dielectric substrate, a second dielectric substrate and a third dielectric substrate, the grounding plate comprises a first grounding plate and a second grounding plate, the first grounding plate is etched below the first dielectric substrate, the second dielectric substrate is arranged below the first dielectric substrate, the feed network is etched below the second dielectric substrate, the third dielectric substrate is arranged below the second dielectric substrate, the second grounding plate is etched below the third dielectric substrate, and the first dielectric substrate, the second dielectric substrate and the third dielectric substrate are connected with the ladder through screws to share one ground.
Further, the dielectric constant of the first dielectric substrate is 9.8, and the dielectric constants of the second dielectric substrate and the third dielectric substrate are 2.5.
Further, the feed network is a wilkinson power divider with equal power division, and the output port of the feed network is divided into a first output port and a second output port, and the phase of the first output port leads the phase of the second output port by 90 degrees.
Further, the isolation resistor R of the feed network has a resistance value of 100 ohms, the input impedance of the main Port is 50 ohms, and a coaxial line with 50 ohms is used for feeding.
The invention has the beneficial effects that:
1. The invention provides a stepped ground structure for improving the phase stability of an antenna, which greatly improves the phase stability of a navigation antenna by loading the stepped ground structure;
2. The invention starts from the ground structure of the antenna unit, and transforms the single-layer ground structure into the stepped ground structure, thereby improving the phase stability of the navigation antenna.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a stepped structure for improving phase stability of an antenna according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second dielectric substrate with a stepped structure for improving phase stability of an antenna according to an embodiment of the present invention;
Fig. 3 is a simulation curve of the phase stability of a single-layer structure, which is the amount of phase change in the range of ±60° of the pitch angle when the azimuth angle of the B3 frequency point is 0 °.
Fig. 4 is a simulation curve of the phase stability of the present invention, where the simulation curve is the amount of phase change within the range of ±60° of the pitch angle when the azimuth angle of the B3 frequency point is 0 °.
Reference numerals:
1-radiating a patch; 2-a dielectric layer; 3-screws; 4-a ground plate; a 5-feed network; 6-step ground;
201-a first dielectric substrate; 202-a second dielectric substrate; 203-a third dielectric substrate;
401-a first ground plate; 402-a second ground plate;
501-a first output port; 502-a second output port; 503—a master Port.
Detailed Description
Embodiments of the technical scheme of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and thus are merely examples, and are not intended to limit the scope of the present invention.
It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "vertical," "horizontal," "front," "rear," "top," "bottom," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is two or more unless explicitly defined otherwise;
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
Examples
As shown in fig. 1, the stepped structure for improving the phase stability of an antenna provided by the invention comprises a radiation patch 1, a dielectric layer 2, a feed network 5, a grounding plate 4 and a stepped ground 6, wherein the dielectric layer 2 is formed by fixing a plurality of layers of dielectric substrates through screws 3, the dielectric layer 2 is arranged above the stepped ground 6, the radiation patch 1 is etched above the dielectric layer 2, the grounding plate 4 is etched below the dielectric layer 2, and the feed network 5 is etched inside the dielectric layer 2; the invention is used for fixing three layers of dielectric substrates together through the screw 3, and ensures that the antennas share the same ground plane through the screw 3.
The dielectric layer 2 has three layers, namely a first dielectric substrate 201, a second dielectric substrate 202 and a third dielectric substrate 203, and the grounding plate 4 comprises a first grounding plate 401 and a second grounding plate 402; the first grounding plate 401 is etched below the first dielectric substrate 201, that is, the first grounding plate 401 is located on the lower surface of the first dielectric substrate 201, the second dielectric substrate 202 is located below the first dielectric substrate 201, the feeding network 5 is etched below the second dielectric substrate 202, the third dielectric substrate 203 is located below the second dielectric substrate 202, the second grounding plate 402 is etched below the third dielectric substrate 203, that is, the second grounding plate 402 is located on the lower surface of the third dielectric substrate 203, and the first dielectric substrate 201, the second dielectric substrate 202 and the third dielectric substrate 203 are connected with the ladder through screws to share one ground.
As shown in fig. 2, the feed network 5 is a wilkinson power divider with equal power division, the output ports of the feed network 5 are divided into a first output Port 501 and a second output Port 502, the phase of the first output Port 501 advances the phase of the second output Port 502 by 90 ° and the resistance value of the isolation resistor R of the feed network 5 is 100 ohms, the input impedance of the main Port503 is 50 ohms, and a coaxial line with 50 ohms is used for feeding.
The phase stability of the antenna can be remarkably improved by verifying the stepped structure by comparing the phase variation of the navigation antenna with the single-layer structure within the range of +/-60 degrees of the pitch angle of the navigation antenna.
According to the invention, modeling simulation verification is carried out on the B3 frequency band, the dielectric constant of the first dielectric substrate is 9.8, the dielectric constants of the second dielectric substrate and the third dielectric substrate are 2.5, and the simulation shows that the variation of the phase within the range of +/-60 degrees of the antenna pitch angle of the single-layer structure is 4.77 degrees; according to the invention, the single-layer grounding plate is optimized to form the stepped grounding plate, the height H of the stepped grounding plate and the distance D of each layer are improved to 1.36 degrees in the range of the pitch angle +/-60 degrees when H=4mm and D=17.5 mm of the antenna loading the multi-layer structure.
In the description of the present invention, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.
Claims (1)
1. The stepped ground structure is characterized by comprising a radiation patch, a dielectric layer, a feed network, a grounding plate and a stepped ground, wherein the dielectric layer is formed by fixing a plurality of layers of dielectric substrates through screws, the dielectric layer is arranged above the stepped ground, the radiation patch is etched above the dielectric layer, the grounding plate is etched below the dielectric layer, and the feed network is etched inside the dielectric layer;
The dielectric layer comprises a first dielectric substrate, a second dielectric substrate and a third dielectric substrate, the grounding plate comprises a first grounding plate and a second grounding plate, the first grounding plate is etched below the first dielectric substrate, the second dielectric substrate is arranged below the first dielectric substrate, the feed network is etched below the second dielectric substrate, the third dielectric substrate is arranged below the second dielectric substrate, the second grounding plate is etched below the third dielectric substrate, and the first dielectric substrate, the second dielectric substrate and the third dielectric substrate are connected with the ladder ground through screws to share one ground;
the dielectric constants of the first dielectric substrate are 9.8, and the dielectric constants of the second dielectric substrate and the third dielectric substrate are 2.5;
The feed network is a wilkinson power divider with equal power division, and the output port of the feed network is divided into a first output port and a second output port, wherein the phase of the first output port leads the phase of the second output port by 90 degrees;
the isolation resistor R of the feed network has a resistance value of 100 ohms, the input impedance of the main Port Port is 50 ohms, and a coaxial line with 50 ohms is used for feeding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811477690.4A CN109387860B (en) | 2018-12-04 | 2018-12-04 | Stepped ground structure for improving phase stability of antenna |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811477690.4A CN109387860B (en) | 2018-12-04 | 2018-12-04 | Stepped ground structure for improving phase stability of antenna |
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| CN109387860A CN109387860A (en) | 2019-02-26 |
| CN109387860B true CN109387860B (en) | 2024-06-07 |
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| CN112038761A (en) * | 2020-08-04 | 2020-12-04 | 广州智讯通信***有限公司 | High-gain circularly polarized antenna |
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