CN209896246U - High-isolation circularly polarized antenna device - Google Patents
High-isolation circularly polarized antenna device Download PDFInfo
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- CN209896246U CN209896246U CN201920983225.1U CN201920983225U CN209896246U CN 209896246 U CN209896246 U CN 209896246U CN 201920983225 U CN201920983225 U CN 201920983225U CN 209896246 U CN209896246 U CN 209896246U
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Abstract
A high-isolation circularly polarized antenna device comprises a conductive grounding plane, a dielectric substrate arranged on the conductive grounding plane and a plurality of radiation pieces arranged on the surface of the dielectric substrate; the radiation sheet is a metal conductor used for receiving or transmitting signals, the radiation sheet comprises a plurality of inverted F-shaped radiation sheet groups which are symmetrically distributed, and each inverted F-shaped radiation sheet group comprises an A-shaped inverted F-shaped radiation sheet and a B-shaped inverted F-shaped radiation sheet; the A-type inverted-F radiation piece and the B-type inverted-F radiation piece respectively comprise an upper part which is horizontally arranged and a lower part which is vertically arranged; one of the A-type inverted-F radiating patch and the B-type inverted-F radiating patch is used as a feeding point, and the other one is used as an open circuit. The utility model discloses an adopt the type of falling F radiation piece group of a plurality of symmetries to realize two kinds of circular polarized signals of levogyration and dextrorotation and independently export, the isolation is high, and processing is simple, and the size is little, and light in weight has satisfied two circular polarized signal reception or transmission application demands, is particularly suitable for accurate measurement and guidance bit system terminal equipment.
Description
Technical Field
The invention belongs to the technical field of antennas, and particularly relates to a high-isolation circularly polarized antenna device.
Background
A circularly polarized antenna, as a component for transmitting or receiving radio waves, plays a crucial role in wireless communication systems, particularly in satellite communication and aircraft measurement and control equipment.
The current satellite navigation positioning equipment is increasingly widely applied in the fields such as positioning, measurement, time service, high-precision agriculture, intelligent transportation and the like. In order to obtain a high-precision positioning requirement of a decimeter level or more, an RTK (real time kinematic (RTK) method) technology is generally adopted for a navigation device, and at this time, an antenna of the device generally has a dual-frequency characteristic, and has a wider operating bandwidth (gain bandwidth, beam bandwidth and axial ratio bandwidth), a more compact size, a simpler processing and manufacturing, and the like. The microstrip patch antenna has the advantages of small shape, low cost, easy conformality, easy processing, easy realization of circular polarization and the like, and is widely applied, so is the circular polarization antenna.
The traditional microstrip antenna generally adopts a laminated mode for realizing double frequency, namely one working frequency band is realized by one layer, and the two layers are superposed to realize double frequency. Wherein the upper layer generally realizes radiation of higher frequency and the lower layer realizes radiation of lower frequency. With the lower radiating patch acting as the floor for the last patch. The structure is complex in feed, meanwhile, the performance of the lower-layer patch is affected by the upper-layer patch, the performance of the lower-layer patch is reduced, and the common microstrip antenna is narrow in working bandwidth and cannot well cover a plurality of satellite navigation systems. If the bandwidth is increased, a dielectric with a low dielectric constant is often required to be used as the antenna substrate material, and the size of the antenna is increased.
The circularly polarized antenna has no polarization mismatch phenomenon, so that the balanced receiving power with lower correlation can be more easily obtained, and the circularly polarized antenna has great advantages. The pair of left-hand circularly polarized waves and the pair of right-hand circularly polarized waves are mutually cross-polarized, and ideally, the pair of mutually cross-polarized waves are mutually isolated, namely, the antenna of the LHCP cannot receive the signal of the RHCP incoming wave, and vice versa. In fact, there is no absolute circular polarization or linear polarization, the locus of the end point of the instantaneous electric field vector of any polarized wave is an ellipse, and the ratio of the major axis to the minor axis of the ellipse is called axial ratio ar (axial ratio), and is generally expressed in dB. The axial ratio is an important performance index of the circularly polarized antenna, which represents the purity of circular polarization, and the bandwidth with the axial ratio not greater than 3dB is generally defined as the circularly polarized bandwidth of the antenna. It is an important index for measuring the signal gain difference of the antenna to different directions.
Circularly polarized waves are characterized by the fact that the vertical and horizontal components of the electric field are equal in magnitude and 90 degrees out of phase. Generally, microstrip antennas are linearly polarized. However, if a special feeding mode is adopted for the microstrip antenna, two degenerate orthogonal modes are excited in the patch, so that the amplitudes of the two orthogonal modes are equal, and the phase difference is 90 degrees, thus obtaining the circularly polarized wave. Circular polarization can be divided into left-hand and right-hand circular polarization depending on the direction of rotation of the electric field. The circularly polarized signal can change after being reflected, and according to the strength of the reflected signal, people can roughly deduce whether the signal is reflected or not and the number of times of reflection, and the signal is used as the basis for signal detection, so the method is widely applied in the field of measurement and control.
Circularly polarized antennas usually have the form of helical antennas, cross-shaped arrays, microstrip antennas, etc., wherein helical antennas have the disadvantage that only one polarization mode can be realized. Microstrip antennas have their own advantages, such as low profile, light weight, low cost, easy conformality, etc., and are easy to form both left-handed and right-handed polarized signals, which is a must choice in special situations. However, the conventional microstrip antenna has a narrow working bandwidth, generally 3% -5%, and cannot be used in spread spectrum communication. The method for widening the frequency bandwidth of the circularly polarized antenna is a key for improving the practical value of the circularly polarized antenna, can greatly improve the anti-interference performance particularly when applied to ultra-wideband communication, and is a key research point for realizing the wide frequency band and miniaturization of the antenna.
The main problems of the current circularly polarized antenna are as follows:
1. the common microstrip antenna generally realizes a working frequency band by a single-layer medium, and the working bandwidth is narrow and only about 5% z, so that the microstrip antenna cannot be well applied to an ultra-wideband (spread spectrum) communication system. If the bandwidth is increased, a dielectric with a low dielectric constant is often required to be used as the antenna substrate material, and the size of the antenna is increased.
2. The conventional helical antenna has the advantages of wide frequency band, wide beam, symmetrical directional diagram and good wide-angle circular polarization performance, and has the defect that only one polarization mode can be realized. The application cannot be satisfied in the occasion of needing double circular polarization.
3. The array antenna (or the array deformation) has the advantages of wide frequency band, symmetrical directional diagram and good circular polarization performance at wide angle, and has the defects of insufficient beam width, complex structure and large size.
Disclosure of Invention
The invention aims to provide a circular polarization antenna device with wide working bandwidth, high gain and small size.
Another object of the present invention is to provide a circular polarization antenna device with high isolation, simple structure, and easy manufacturing.
In order to solve the above technical problem, the present invention discloses a high isolation circular polarization antenna device, including: the antenna comprises a conductive grounding plane, a medium substrate arranged on the conductive grounding plane and a plurality of radiation sheets arranged on the surface of the medium substrate;
the radiation sheet is a metal conductor used for receiving or transmitting signals, the radiation sheet comprises a plurality of inverted F-shaped radiation sheet groups which are symmetrically distributed, and each inverted F-shaped radiation sheet group comprises an A-shaped inverted F-shaped radiation sheet and a B-shaped inverted F-shaped radiation sheet; the A-type inverted-F radiation piece and the B-type inverted-F radiation piece are symmetrically arranged;
the A-type inverted-F radiation piece and the B-type inverted-F radiation piece respectively comprise a horizontally arranged upper part and a vertically arranged lower part, the upper parts of the A-type inverted-F radiation piece and the B-type inverted-F radiation piece are respectively attached to the upper surface of the medium substrate, and the lower parts of the A-type inverted-F radiation piece and the B-type inverted-F radiation piece are respectively attached to the surface of the side wall of the medium substrate;
one of the A-type inverted-F radiation piece and the B-type inverted-F radiation piece of the inverted-F radiation piece set is used as a feeding point, and the other one is used as an open circuit.
Preferably, a first contact point and a second contact point are arranged at the bottom of each a-type inverted F-type radiation piece in each inverted F-type radiation piece group set, and a third contact point and a fourth contact point are arranged at the bottom of each B-type inverted F-type radiation piece.
Preferably, in each inverted F-shaped radiating patch group, the first contact point and the fourth contact point are connected to a conductive ground plane, the second contact point and the third contact point are adjacent, the third contact point is a feeding point, and the second contact point is not connected to the conductive ground plane.
Preferably, the second contact point is a feed point and the feed point is open-circuited.
Preferably, the inverted F-shaped radiating plate groups are four groups in total.
Preferably, the four a-type inverted F-type radiating patches realize left-hand circular polarization of signals; the four B-type inverted-F radiation pieces realize right-hand circular polarization of signals.
Preferably, the dielectric substrate has one layer or a plurality of layers stacked one on top of the other.
Preferably, the dielectric substrate includes a lower high-dielectric-constant dielectric substrate and an upper low-dielectric-constant dielectric substrate.
Preferably, the dielectric substrate is one of cylindrical, semi-conical or stepped cylindrical in whole.
Preferably, the middle part of the medium substrate is solid or is processed with a round through hole.
The circularly polarized antenna device with high isolation degree at least has the following advantages:
1. the antenna adopts 1 or more medium substrates with different specifications and different thicknesses and 4 groups of orthogonal inverted F-shaped radiating sheets, so that the adjusting parameters of the antenna are increased, and the working bandwidth of the antenna can be greatly increased on the premise of ensuring small volume. The symmetrical structure ensures the stability of the phase center, can realize two circular polarizations of right hand and left hand, meets the application requirements of receiving (or transmitting) double circular polarization signals, is convenient for industrialized processing, and is particularly suitable for terminal equipment of an accurate measurement and positioning guidance system.
2. Because the left-hand signal and the right-hand signal are fed separately, the left-hand signal and the right-hand signal have high isolation.
3. The middle part of the antenna can be made into a hollow form, so that the antenna is convenient to use on a special aircraft.
4. The antenna has simple structure and is more convenient to process, design and assemble.
5. The antenna is applied to special occasions, and when glue is filled and sealed, the antenna unit can be well fixed, and the antenna is more resistant to impact vibration.
6. The radiation sheet of the inverted-F antenna is convenient to process, the working frequency can be changed by adjusting the size of the radiation sheet, the industrial processing is facilitated, the fault-tolerant performance is better, the product percent of pass is improved, and the production cost is reduced.
7. The product is easy to form, and a thicker antenna is easy to manufacture because the technology of metalized via holes and the like of the common microstrip antenna is not involved.
8. The medium substrate can be made into one or more layers of cylinders, hollow cylinders, semi-cones, hollow semi-cones and the like so as to adapt to different application occasions.
Drawings
Fig. 1 is a schematic structural diagram of a circularly polarized antenna device with high isolation.
Fig. 2 is a top view of the high isolation circular polarized antenna assembly of fig. 1.
Fig. 3 is a side view of the high isolation circularly polarized antenna assembly of fig. 1. (wherein, the projection below the second contact point 312 is the side view projection of the feeding point in the other inverted-F radiation plate group.)
Fig. 4 is a bottom view of the high-isolation circular polarization antenna device in fig. 1.
Fig. 5 is a circuit diagram of a circular polarization antenna device with high isolation.
The reference numbers in the figures are: the antenna comprises a 1-conductive ground plane, a 2-dielectric substrate, a 210-high dielectric constant dielectric substrate, a 220-low dielectric constant dielectric substrate, a 3-inverted F-shaped radiating plate group, a 301-upper part, a 302-lower part, a 310-A inverted F-shaped radiating plate, a 320-B inverted F-shaped radiating plate, a 311-first contact point, a 312-second contact point, a 321-third contact point, a 322-fourth contact point and a 4-circular through hole.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," when used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Example 1
As shown in fig. 1 to 4, a high isolation circular polarization antenna device includes: the antenna comprises a conductive grounding plane 1, a dielectric substrate 2 arranged on the conductive grounding plane and a plurality of radiation sheets arranged on the surface of the dielectric substrate;
the radiation sheet is a metal conductor used for receiving or transmitting signals, the radiation sheet comprises a plurality of inverted-F radiation sheet groups 3 which are symmetrically distributed, and each inverted-F radiation sheet group comprises an A-type inverted-F radiation sheet 310 and a B-type inverted-F radiation sheet 320; the A-type inverted-F radiation piece and the B-type inverted-F radiation piece are symmetrically arranged;
the A-type inverted-F radiation piece and the B-type inverted-F radiation piece respectively comprise an upper portion 301 arranged horizontally and a lower portion 302 arranged vertically, the upper portions of the A-type inverted-F radiation piece and the B-type inverted-F radiation piece are respectively attached to the upper surface of the medium substrate, and the lower portions of the A-type inverted-F radiation piece and the B-type inverted-F radiation piece are respectively attached to the surface of the side wall of the medium substrate.
One of the A-type inverted-F radiation piece and the B-type inverted-F radiation piece of the inverted-F radiation piece set is used as a feeding point, and the other one is used as an open circuit.
The bottom of each A-type inverted F-shaped radiation piece is provided with a first contact point 311 and a second contact point 312, and the bottom of each B-type inverted F-shaped radiation piece is provided with a third contact point 321 and a fourth contact point 322.
In each inverted F-shaped radiating plate group, the first contact point and the fourth contact point are connected with the conductive ground plane, the second contact point and the third contact point are adjacent, the third contact point is a feeding point, and the second contact point is not connected with the conductive ground plane.
The second contact point is a feed point and the feed point is open.
The inverted F-shaped radiating plate groups are four groups in total.
The four A-type inverted-F radiation pieces realize left-hand circular polarization of signals;
the four B-type inverted-F radiation pieces realize right-hand circular polarization of signals.
The dielectric substrate has 2 layers.
The dielectric substrate 2 includes a lower high-dielectric-constant dielectric substrate 210 and an upper low-dielectric-constant dielectric substrate 220.
The dielectric substrate is cylindrical as a whole.
The middle part of the medium substrate is solid or is processed with a round through hole 4.
Example 2
As shown in fig. 5, in this embodiment, 4 orthogonal inverted F-shaped radiation plate groups are adopted, and after 2 signals (separated by 1) are subjected to signal 180 phase shift and combined by a 90-degree coupler, good left-hand and right-hand circularly polarized signal outputs are obtained (where Hybrid180 degrees is the coupler with 90-degree phase shift, and Hybrid90 degrees is the coupler with 90-degree phase shift).
4 inverted F-shaped radiating patch groups have large loss of a feed circuit, but the obtained circular polarization performance is good, and the antenna is symmetrical, so that the phase center is stable.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.
Claims (10)
1. A high isolation circularly polarized antenna apparatus, comprising: the antenna comprises a conductive grounding plane, a medium substrate arranged on the conductive grounding plane and a plurality of radiation sheets arranged on the surface of the medium substrate;
the radiation sheet is a metal conductor used for receiving or transmitting signals, the radiation sheet comprises a plurality of inverted F-shaped radiation sheet groups which are symmetrically distributed, and each inverted F-shaped radiation sheet group comprises an A-shaped inverted F-shaped radiation sheet and a B-shaped inverted F-shaped radiation sheet; the A-type inverted-F radiation piece and the B-type inverted-F radiation piece are symmetrically arranged;
the A-type inverted-F radiation piece and the B-type inverted-F radiation piece respectively comprise a horizontally arranged upper part and a vertically arranged lower part, the upper parts of the A-type inverted-F radiation piece and the B-type inverted-F radiation piece are respectively attached to the upper surface of the medium substrate, and the lower parts of the A-type inverted-F radiation piece and the B-type inverted-F radiation piece are respectively attached to the surface of the side wall of the medium substrate;
one of the A-type inverted-F radiation piece and the B-type inverted-F radiation piece of the inverted-F radiation piece set is used as a feeding point, and the other one is used as an open circuit.
2. The high-isolation circularly polarized antenna apparatus as claimed in claim 1, wherein a first contact point and a second contact point are provided at the bottom of each a-type inverted-F radiating patch in each group of inverted-F radiating patches, and a third contact point and a fourth contact point are provided at the bottom of each B-type inverted-F radiating patch.
3. The high-isolation circularly polarized antenna apparatus of claim 2, wherein in each inverted-F radiating element group, the first contact point and the fourth contact point are connected to the conductive ground plane, the second contact point and the third contact point are adjacent, the third contact point is a feeding point, and the second contact point is not connected to the conductive ground plane.
4. The high-isolation circularly polarized antenna apparatus of claim 3, wherein said second contact point is a feeding point and said feeding point is open-circuited.
5. The high-isolation circularly polarized antenna apparatus as claimed in claim 4, wherein said inverted-F radiating plate groups are four groups.
6. The high-isolation circularly polarized antenna apparatus according to claim 5, wherein said four A-type inverted-F radiating patches implement left-hand circular polarization of signals;
the four B-type inverted-F radiation pieces realize right-hand circular polarization of signals.
7. The high isolation circularly polarized antenna assembly of any of claims 1-6, wherein said dielectric substrate has one layer or a plurality of layers stacked one on top of the other.
8. The high-isolation circularly polarized antenna device according to claim 7, wherein said dielectric substrate comprises a lower high-dielectric-constant dielectric substrate and an upper low-dielectric-constant dielectric substrate.
9. The high isolation circularly polarized antenna assembly of claim 8 wherein said dielectric substrate is one of generally cylindrical, semi-conical, or stepped cylindrical.
10. The high-isolation circularly polarized antenna apparatus as claimed in claim 8, wherein the central portion of the dielectric substrate is solid or has a circular through hole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920983225.1U CN209896246U (en) | 2019-06-27 | 2019-06-27 | High-isolation circularly polarized antenna device |
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| CN201920983225.1U CN209896246U (en) | 2019-06-27 | 2019-06-27 | High-isolation circularly polarized antenna device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110247170A (en) * | 2019-06-27 | 2019-09-17 | 江苏三和欣创通信科技有限公司 | The circularly polarized antenna device of high-isolation |
| CN110247170B (en) * | 2019-06-27 | 2024-05-14 | 江苏三和欣创通信科技有限公司 | High-isolation circularly polarized antenna device |
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2019
- 2019-06-27 CN CN201920983225.1U patent/CN209896246U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110247170A (en) * | 2019-06-27 | 2019-09-17 | 江苏三和欣创通信科技有限公司 | The circularly polarized antenna device of high-isolation |
| CN110247170B (en) * | 2019-06-27 | 2024-05-14 | 江苏三和欣创通信科技有限公司 | High-isolation circularly polarized antenna device |
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