CN114824830A - Patch array antenna with circularly polarized side lobe suppression - Google Patents
Patch array antenna with circularly polarized side lobe suppression Download PDFInfo
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- CN114824830A CN114824830A CN202210744596.0A CN202210744596A CN114824830A CN 114824830 A CN114824830 A CN 114824830A CN 202210744596 A CN202210744596 A CN 202210744596A CN 114824830 A CN114824830 A CN 114824830A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
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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
- H01Q1/50—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
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/24—Polarising devices; Polarisation filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
- H01Q21/065—Patch antenna array
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/20—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a curvilinear path
Abstract
The application provides a patch array antenna for circularly polarized side lobe suppression, which comprises an antenna array, a dielectric structure, a feed network and a plurality of feed probes; the antenna array and the feed network are oppositely arranged on two sides of the dielectric structure; the antenna array comprises four antenna array elements; each antenna array element comprises three antenna units which are arranged in a right-angle mode; the antenna units positioned at the right-angle vertex in each antenna array element are uniformly distributed on a first circumference, and the rest antenna units are uniformly distributed on a second circumference; the feed network is provided with an output port corresponding to each antenna unit; each antenna unit is connected with the output port at the corresponding position through one feed probe. The method has excellent circular polarization performance, higher gain and better side lobe suppression effect, and can effectively reduce the phenomena of mutual interference and coupling of signals in a multi-channel application scene.
Description
Technical Field
The application relates to the technical field of antennas, in particular to a patch array antenna for circularly polarized side lobe suppression.
Background
The wireless coverage network used in the scenes of electronic charging system, intelligent home, industrial internet and the like is based on the special short-range communication technology. The short-distance communication scenes often encounter the situation of multiple channels, such as the situation that a plurality of charging systems are arranged side by side on a highway, a concurrent pipeline exists in a large intelligent factory and the like. Based on the above practical situation, adjacent channels may interfere with each other due to the close distance. In order to prevent mutual interference between the service channels, firstly, the beam width of the array antenna needs to be precisely controlled, and secondly, sidelobes with high level values need to be suppressed.
The actually tested side lobe level value of the existing circularly polarized patch array antenna is about-12 dB, and the side lobe level value can introduce interference from adjacent channels into a main lobe, thereby seriously reducing the signal resolution. An effective way to reduce the values of the side lobe levels is to change the physical structure of the array antenna, e.g. change the array pitch of the slot array antenna with back cavity, load the patch array antenna with complementary open resonant rings, or make the array elements have non-uniform size and sparse arrays. However, when multiple parameters need to be optimized simultaneously, the method greatly increases the complexity of array design, resulting in higher processing difficulty and higher production cost.
Disclosure of Invention
In view of the above, the present application is proposed to provide a circularly polarized sidelobe canceling patch array antenna which overcomes or at least partially solves the above problems, comprising:
a circularly polarized sidelobe suppressed patch array antenna, comprising: the antenna array, the dielectric structure, the feed network and the feed probes are arranged in the antenna array;
the antenna array and the feed network are oppositely arranged on two sides of the dielectric structure; the antenna array comprises four antenna array elements; each antenna array element comprises three antenna units which are arranged in a right-angle mode; the antenna units positioned at the right-angle vertex in each antenna array element are uniformly distributed on a first circumference, and the rest antenna units are uniformly distributed on a second circumference; the circle centers of the first circumference and the second circumference are the same; the radius of the first circle is smaller than the radius of the second circle; the feed network is provided with an output port corresponding to each antenna unit; a plurality of feed probes penetrate through the inside of the dielectric structure; each antenna unit is connected with the output port at the corresponding position through one feed probe;
when radio frequency signals are input into each antenna array element, the feed network divides the energy of the radio frequency signals into different sizes according to the distance between the antenna elements and the circle center, and the radio frequency signals are sequentially transmitted to each antenna element in the antenna array elements in a clockwise or anticlockwise direction.
Preferably, the antenna unit is a square patch antenna; chamfers are arranged on one group of opposite angles of the antenna unit; and adjacent antenna units in the same antenna array element are arranged by 90 degrees in sequence.
Preferably, the antenna unit includes a first side, a second side, a third side and a fourth side which are sequentially connected end to end; the lengths of the first edge, the second edge, the third edge and the fourth edge are respectively 13.5 mm; the chamfers are respectively arranged at the end part where the first edge and the second edge are intersected and the end part where the third edge and the fourth edge are intersected; the radius of the chamfer is 1.5 mm; a feed point corresponding to the feed probe is arranged on the antenna unit; the feeding point is disposed on a center line of the first side and the third side and is spaced 4.6mm from the fourth side.
Preferably, the radius of the first circumference is 1/2 of the radius of the second circumference; and adjacent antenna array elements are arranged by 90 degrees in sequence.
Preferably, the distance between adjacent antenna units is 27 mm.
Preferably, the feed network comprises a first microstrip line, a second microstrip line and a T-shaped power divider; two antenna units distributed on the second circumference in the antenna array element are connected in parallel through the first microstrip line to form a first parallel structure, and the first parallel structure is connected in parallel with the antenna units distributed on the first circumference through the second microstrip line to form a second parallel structure; each second parallel structure is connected in parallel to a signal port through the T-shaped power divider;
when the radio-frequency signal is input into each antenna array element through the signal port, the T-shaped power divider performs power distribution on each second parallel structure, the second microstrip line performs phase compensation on the first parallel structure and the antenna units distributed on the first circumference, and the first microstrip line performs phase compensation on two antenna units distributed on the second circumference, so that the energy of the radio-frequency signal is divided into different magnitudes and is sequentially transmitted to each antenna unit in the antenna array element in a clockwise or counterclockwise direction.
Preferably, in the antenna array element, a feed power division ratio of the antenna elements distributed on the first circumference to the two antenna elements distributed on the second circumference is 3.4: 1.
Preferably, the dielectric structure comprises an upper dielectric plate, a lower dielectric plate, a ground plate and a connecting column;
the upper dielectric plate and the lower dielectric plate are arranged in parallel and are connected through the connecting column; the antenna array is arranged on one side of the upper dielectric plate back to the lower dielectric plate; the ground plate is arranged on one side, facing the upper dielectric plate, of the lower dielectric plate, and the feed network is arranged on one side, facing away from the upper dielectric plate, of the lower dielectric plate; one end of each feed probe is connected with one antenna unit, and the other end of each feed probe penetrates through the upper-layer dielectric plate, the ground plate and the lower-layer dielectric plate to be connected with the feed network.
Preferably, the lengths of the upper dielectric plate and the lower dielectric plate are 108mm respectively, and the widths of the upper dielectric plate and the lower dielectric plate are 108mm respectively. The thickness of the upper layer medium plate is 1 mm; the thickness of the lower dielectric plate is 1 mm; the distance between the upper dielectric plate and the lower dielectric plate is 0.036 mm.
Preferably, the upper medium plate is an F4B plate; the lower medium plate is an FR4 plate; the antenna array and the grounding plate are copper plates respectively.
The application has the following advantages:
in the embodiment of the application, the antenna array, the dielectric structure, the feed network and the feed probes are used; the antenna array and the feed network are oppositely arranged on two sides of the dielectric structure; the antenna array comprises four antenna array elements; each antenna array element comprises three antenna units which are arranged in a right-angle mode; the antenna units positioned at the right-angle vertex in each antenna array element are uniformly distributed on a first circumference, and the rest antenna units are uniformly distributed on a second circumference; the circle centers of the first circumference and the second circumference are the same; the radius of the first circle is smaller than the radius of the second circle; the feed network is provided with an output port corresponding to each antenna unit; a plurality of feed probes penetrate through the inside of the dielectric structure; each antenna unit is connected with the output port at the corresponding position through one feed probe; when radio frequency signals are input into each antenna array element, the feed network divides the energy of the radio frequency signals into different sizes according to the distance between the antenna elements and the circle center, and sequentially transmits the energy to each antenna element in the antenna array elements in a clockwise or anticlockwise direction; the patch array antenna has excellent circular polarization performance, higher gain and better side lobe suppression effect, and can effectively reduce the phenomena of mutual interference and coupling of signals in a multi-channel application scene; in addition, the patch array antenna is simple to process and low in cost, and can play an important role in the application scene of short-distance wireless communication.
Drawings
In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the description of the present application will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a patch array antenna according to an embodiment of the present application.
Fig. 2 is another structural schematic diagram (front side) of a patch array antenna according to an embodiment of the present application.
Fig. 3 is a schematic structural diagram (back side) of a patch array antenna according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of an antenna array, a feed network, and a feed probe in a patch array antenna according to an embodiment of the present application.
Fig. 5 is a schematic structural diagram of an antenna unit in a patch array antenna according to an embodiment of the present application.
Fig. 6 is a schematic diagram (front view) of a patch array antenna according to an embodiment of the present disclosure.
Fig. 7 is a schematic diagram (back side) of a patch array antenna according to an embodiment of the present application.
Fig. 8 is a schematic structural diagram of a circular polarization patch array antenna according to an embodiment of the present application.
Fig. 9 is a schematic structural diagram of a circular polarization patch array antenna and five receiving antennas according to an embodiment of the present application.
Fig. 10 is a simulation curve of the gain of a circular polarized patch array antenna according to an embodiment of the present application as a function of angle.
Fig. 11 is a simulation curve of the gain of a patch array antenna according to an embodiment of the present application as a function of angle.
Fig. 12 is a simulation and measurement S11 curve of a patch array antenna according to an embodiment of the present application.
Fig. 13 is a graph of simulation and measurement of zenith gain versus axial ratio versus frequency for a patch array antenna according to an embodiment of the present application.
Fig. 14 is a simulated and measured radiation pattern (phi =0 ° plane) for a patch array antenna according to an embodiment of the present application
Fig. 15 is a simulated and measured radiation pattern (phi =90 ° plane) for a patch array antenna according to an embodiment of the present application
Fig. 16 is a simulation and measurement curve of axial ratio as a function of angle for a patch array antenna according to an embodiment of the present application.
The reference numbers in the drawings attached hereto are as follows:
100. an antenna array; 200. a dielectric structure; 300. a feed network; 400. a feed probe.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1 to 7, a patch array antenna for circularly polarized sidelobe suppression according to an embodiment of the present application is shown, including: antenna array 100, dielectric structure 200, feed network 300, and several feed probes 400;
the antenna array 100 and the feeding network 300 are oppositely arranged on two sides of the dielectric structure 200; the antenna array 100 includes four antenna elements; each antenna array element comprises three antenna units which are arranged in a right-angle mode; the antenna units positioned at the vertex of the right angle in each antenna array element are uniformly distributed on a first circumference, and the rest antenna units are uniformly distributed on a second circumference; the circle centers of the first circumference and the second circumference are the same; the radius of the first circle is smaller than the radius of the second circle; the feed network 300 is provided with an output port corresponding to each antenna unit; a plurality of the feed probes 400 are arranged in the dielectric structure 200 in a penetrating way; each antenna unit is connected to the output port at a corresponding position through one feed probe 400;
when a radio frequency signal is input into each antenna array element, the feed network 300 divides the energy of the radio frequency signal into different sizes according to the distance between the antenna elements and the circle center, and sequentially transmits the energy to each antenna element in the antenna array elements in a clockwise or counterclockwise direction.
In the embodiment of the present application, the antenna array 100, the dielectric structure 200, the feeding network 300 and the feeding probes 400; the antenna array 100 and the feeding network 300 are oppositely arranged on two sides of the dielectric structure 200; the antenna array 100 includes four antenna elements; each antenna array element comprises three antenna units which are arranged in a right-angle mode; the antenna units positioned at the right-angle vertex in each antenna array element are uniformly distributed on a first circumference, and the rest antenna units are uniformly distributed on a second circumference; the circle centers of the first circumference and the second circumference are the same; the radius of the first circle is smaller than the radius of the second circle; the feed network 300 is provided with an output port corresponding to each antenna unit; a plurality of the feed probes 400 are arranged in the dielectric structure 200 in a penetrating way; each antenna unit is connected to the output port at a corresponding position through one feed probe 400; when a radio frequency signal is input into each antenna array element, the feed network 300 divides the energy of the radio frequency signal into different magnitudes according to the distance between the antenna element and the center of the circle, and sequentially transmits the different magnitudes to each antenna element in the antenna array element in a clockwise or counterclockwise direction, so that the patch array antenna has excellent circular polarization performance (720 MHz is realized when the circular polarization axial ratio bandwidth is 5.8GHz, and the corresponding circular polarization axial ratio is 0.3 dB), and has high gain and good side lobe suppression effect (15.3 dBi gain on a plane with an azimuth phi =0 °, and a side lobe lower than-30 dB on a plane with an azimuth phi =90 °), and the phenomena of mutual interference and coupling of signals in a multi-channel application scene can be effectively reduced; in addition, the patch array antenna is simple to process and low in cost, and can play an important role in the application scene of short-distance wireless communication.
Next, a circularly polarized sidelobe suppressed patch array antenna in the present exemplary embodiment will be further described.
The patch array antenna comprises four antenna rows, and the first antenna row and the fourth antenna row respectively comprise two antenna units; the second and third antenna rows comprise the four antenna elements, respectively; the first antenna element of the second antenna row and the first antenna element of the third antenna row are located in the same column; a fourth said antenna element of the second antenna row and a fourth said antenna element of the third antenna row are in the same column; the first antenna element of the first antenna row, the second antenna element of the second antenna row, the second antenna element of the third antenna row and the first antenna element of the fourth antenna row are located in the same column; the second antenna element of the first antenna row, the third antenna element of the second antenna row, the third antenna element of the third antenna row and the second antenna element of the fourth antenna row are located in the same column.
In this embodiment, the antenna unit is a square patch antenna; chamfers are arranged on one group of opposite angles of the antenna unit; and adjacent antenna units in the same antenna array element are arranged by 90 degrees in sequence. Specifically, a set of opposite corners of the first antenna element of the first antenna row, the first antenna element of the second antenna row, the third antenna element of the second antenna row, the second antenna element of the third antenna row, the fourth antenna element of the third antenna row, and the second antenna element of the fourth antenna row in the first diagonal direction of the dielectric structure 200 are provided with chamfers; a set of opposite corners of the second antenna element of the first antenna row, the second antenna element of the second antenna row, the fourth antenna element of the second antenna row, the first antenna element of the third antenna row, the third antenna element of the third antenna row, and the first antenna element of the fourth antenna row in the second diagonal direction of the dielectric structure 200 are provided with chamfers. The square antenna unit can generate circularly polarized electromagnetic wave radiation by arranging chamfers on one group of opposite angles of the antenna unit; by arranging adjacent antenna units with a 90-degree phase difference in sequence, good circular polarization performance can be achieved.
In this embodiment, the antenna unit includes a first side, a second side, a third side and a fourth side that are sequentially connected end to end; the lengths of the first edge, the second edge, the third edge and the fourth edge are respectively 13.5 mm; the chamfers are respectively arranged at the end part where the first edge and the second edge are intersected and the end part where the third edge and the fourth edge are intersected; the radius of the chamfer is 1.5 mm; a feeding point corresponding to the feeding probe 400 is arranged on the antenna unit; the feeding point is disposed on a center line of the first side and the third side and is spaced 4.6mm from the fourth side. As shown in fig. 5, the circular point on the surface of the antenna element is the feeding point of the antenna element; the side length Wp of the antenna unit is 13.5mm, the radius s of the chamfer is 1.5mm, and the distance Lf between the feed point and the fourth edge is 4.6 mm.
In this embodiment, the radius of the first circle is 1/2 of the radius of the second circle; and adjacent antenna array elements are arranged by 90 degrees in sequence.
In this embodiment, the distance between adjacent antenna units is 27 mm.
In this embodiment, the feeding network 300 includes a first microstrip line, a second microstrip line, and a T-shaped power divider; two antenna units distributed on the second circumference in the antenna array element are connected in parallel through the first microstrip line to form a first parallel structure, and the first parallel structure is connected in parallel with the antenna units distributed on the first circumference through the second microstrip line to form a second parallel structure; each second parallel structure is connected in parallel to a signal port through the T-shaped power divider;
when the radio-frequency signal is input into each antenna array element through the signal port, the T-shaped power divider performs power distribution on each second parallel structure, the second microstrip line performs phase compensation on the first parallel structure and the antenna units distributed on the first circumference, and the first microstrip line performs phase compensation on two antenna units distributed on the second circumference, so that the energy of the radio-frequency signal is divided into different magnitudes and is sequentially transmitted to each antenna unit in the antenna array element in a clockwise or counterclockwise direction.
The energy of the radio frequency signal is divided into different sizes through the T-shaped power divider and the microstrip line, and the different sizes are sequentially transmitted to each antenna unit in the antenna array element in a clockwise or anticlockwise direction, so that the antenna beam angle can be effectively narrowed, and the side lobe level of the antenna is reduced.
In this embodiment, the feeding power division ratio between the antenna elements distributed on the first circumference and the two antenna elements distributed on the second circumference in the antenna array element is 3.4: 1.
In this embodiment, the dielectric structure 200 includes an upper dielectric plate, a lower dielectric plate, a ground plate, and a connecting column;
the upper dielectric plate and the lower dielectric plate are arranged in parallel and are connected through the connecting column; the antenna array 100 is arranged on one side of the upper dielectric plate back to the lower dielectric plate; the ground plate is arranged on one side of the lower dielectric plate facing the upper dielectric plate, and the feed network 300 is arranged on one side of the lower dielectric plate facing away from the upper dielectric plate; one end of each of the feeding probes 400 is connected to one of the antenna units, and the other end of each of the feeding probes passes through the upper dielectric plate, the ground plate, and the lower dielectric plate to be connected to the feeding network 300.
In this embodiment, the lengths of the upper dielectric plate and the lower dielectric plate are 108mm, and the widths of the upper dielectric plate and the lower dielectric plate are 108 mm. The thickness of the upper layer medium plate is 1 mm; the thickness of the lower dielectric plate is 1 mm; the distance between the upper dielectric plate and the lower dielectric plate is 0.036 mm. The patch array antenna is compact in size and can be applied to different scenes.
In this embodiment, the upper dielectric slab is an F4B slab; the lower medium plate is an FR4 plate; the antenna array 100 and the ground plate are copper plates, respectively. Specifically, the relative dielectric constant of the upper dielectric plate is 2.65, and the loss tangent is 0.001; the relative dielectric constant of the lower dielectric plate is 4.3, and the loss tangent is 0.025; the tangent loss angle of the dielectric plate is small, so that the gain and the radiation efficiency of the antenna array are improved; the patch array antenna is prepared based on a printed circuit board, and has the characteristics of low cost, easiness in processing and the like.
In contrast, a circularly polarized patch array antenna is provided, as shown in fig. 8, which includes 16 antenna elements arranged in a 4 × 4 array, and adopts a constant-amplitude in-phase feeding manner, and the simulated side lobe level value is-13.2 dB, and it has been proposed in the foregoing that the side lobe of about-12 dB always has high interference for a multi-channel system.
To test the gain performance of the circularly polarized patch array antenna as a control and the patch array antenna described in the present application, five linearly polarized antennas were introduced as receiving antennas (p 0, p1, p2, p3, p4, p 5), as shown in fig. 9, so that the far fields of the transmission arrays in the directions of θ = ± 43 ° in the spherical distribution of the five receiving antennas are in the planes of Φ =0 ° and Φ =90 °.
A simulation curve of the gain of the circularly polarized patch array antenna as a comparison with the change of the angle is shown in fig. 10; a simulation curve of the gain of the patch array antenna changing with the angle in the application is shown as 11; it can be seen that, after four corner units of a 4 × 4 array are removed, the gain level of the patch array antenna in the present application is almost unchanged, and the level of the side lobe of the patch array antenna in the present application on two main planes (i.e., planes of phi =0 ° and phi =90 °) is lower than-30 dB, which indicates that the high gain performance of the antenna is not affected after the four corner units are removed, and the number of all the antenna units is reduced by 25%, so that the complexity of the feed network 300 to be designed is greatly reduced, the production flow is simplified, and the production cost is reduced.
The simulation and measurement S11 curves for the patch array antenna described in this application are shown in fig. 12; it can be seen that the patch array antenna measures a bandwidth of 620MHz with a good impedance match at 5.8 GHz.
The simulation and measurement curves of the peak gain-to-axis ratio of the patch array antenna in the present application varying with frequency are shown in fig. 13; it can be seen that the measurement bandwidth with an axial ratio <3dB is 5.50-6.22GHz, and the axial ratio at 5.8GHz is 0.3dB, indicating that the patch array antenna has good circular polarization performance at 5.8 GHz. Further, the simulated gain of the patch array antenna was 15.8dBi, and the gain measured at 5.8GHz was 15.3 dBi.
The impedance bandwidth (10.6%) and the axial ratio bandwidth (12.4%) of the patch array antenna are not very wide, because the optimal distribution of the excitation is determined by the center frequency of the frequency band, and therefore the patch array antenna is only suitable for narrow band applications, such as a multilayer-based broadband feed network structure or some metamaterial technologies.
Simulated and measured radiation patterns of the patch array antenna described in this application are shown in fig. 14 and 15, where fig. 14 is a plane of phi =0 deg., and fig. 15 is a plane of phi =90 deg.; it can be seen that the half-power beam width measured by the patch array antenna is 28 ° in the plane of Φ =0 °, and 30 ° in the plane of Φ =90 °, the measurement is substantially consistent with the simulation result. The measured side lobe level is-30 dB on the phi =0 ° plane and-32 dB on the phi =90 ° plane, the measurement result is slightly higher than the simulation result, possibly caused by manufacturing errors.
The simulation and measurement curves of the axial ratio as a function of angle for the patch array antenna described in this application are shown in fig. 16, and it can be seen that the 3dB axial ratio beam width measured over the phi =0 deg. plane is 74 deg., and the 3-dB axial ratio beam width measured over phi =90 deg. is 64 deg..
In summary, the patch array antenna has a compact size, a wide 3dB axial ratio bandwidth, a low side lobe and a high gain performance, can be used in short-distance real-time communication scenes, such as vehicle-mounted Electronic Toll Collection, short-distance high-resolution imaging, smart home, industrial internet and other scenes, especially in vehicle-mounted Electronic Toll Collection scenes, can achieve an expected far-field performance, meet the requirements of an ETC (Electronic Toll Collection) system, and can ensure the communication of the robust performance of a vehicle.
While preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The circularly polarized sidelobe suppressed patch array antenna provided by the present application is introduced in detail above, and a specific example is applied in the present application to explain the principle and the implementation manner of the present application, and the description of the above embodiment is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, the specific implementation manner and the application scope may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A circularly polarized sidelobe canceling patch array antenna, comprising: the antenna array, the dielectric structure, the feed network and the feed probes are arranged in the antenna array;
the antenna array and the feed network are oppositely arranged on two sides of the dielectric structure; the antenna array comprises four antenna array elements; each antenna array element comprises three antenna units which are arranged in a right-angle mode; the antenna units positioned at the right-angle vertex in each antenna array element are uniformly distributed on a first circumference, and the rest antenna units are uniformly distributed on a second circumference; the circle centers of the first circumference and the second circumference are the same; the radius of the first circle is smaller than the radius of the second circle; the feed network is provided with an output port corresponding to each antenna unit; a plurality of feed probes penetrate through the inside of the dielectric structure; each antenna unit is connected with the output port at the corresponding position through one feed probe;
when radio frequency signals are input into each antenna array element, the feed network divides the energy of the radio frequency signals into different sizes according to the distance between the antenna elements and the circle center, and the radio frequency signals are sequentially transmitted to each antenna element in the antenna array elements in a clockwise or anticlockwise direction.
2. A patch array antenna according to claim 1, wherein said antenna element is a square patch antenna; chamfers are arranged on one group of opposite angles of the antenna unit; and adjacent antenna units in the same antenna array element are arranged by 90 degrees in sequence.
3. A patch array antenna according to claim 2, wherein said antenna element includes a first side, a second side, a third side and a fourth side connected end to end in sequence; the lengths of the first edge, the second edge, the third edge and the fourth edge are respectively 13.5 mm; the chamfers are respectively arranged at the end part where the first edge and the second edge are intersected and the end part where the third edge and the fourth edge are intersected; the radius of the chamfer is 1.5 mm; a feed point corresponding to the feed probe is arranged on the antenna unit; the feeding point is disposed on a center line of the first side and the third side and is spaced 4.6mm from the fourth side.
4. A patch array antenna according to claim 1, wherein the radius of said first circumference is 1/2 times the radius of said second circumference; and adjacent antenna array elements are arranged by 90 degrees in sequence.
5. A patch array antenna according to claim 4, wherein the distance between adjacent antenna elements is 27 mm.
6. A patch array antenna according to claim 1, wherein said feed network comprises a first microstrip line, a second microstrip line and a T-type power divider; two antenna units distributed on the second circumference in the antenna array element are connected in parallel through the first microstrip line to form a first parallel structure, and the first parallel structure is connected in parallel with the antenna units distributed on the first circumference through the second microstrip line to form a second parallel structure; each second parallel structure is connected in parallel to a signal port through the T-shaped power divider;
when the radio-frequency signal is input into each antenna array element through the signal port, the T-shaped power divider performs power distribution on each second parallel structure, the second microstrip line performs phase compensation on the first parallel structure and the antenna units distributed on the first circumference, and the first microstrip line performs phase compensation on two antenna units distributed on the second circumference, so that the energy of the radio-frequency signal is divided into different magnitudes and is sequentially transmitted to each antenna unit in the antenna array element in a clockwise or counterclockwise direction.
7. A patch array antenna according to claim 6, wherein the antenna elements of the antenna array element distributed on the first circumference have a feed power division ratio of 3.4:1 to two antenna elements distributed on the second circumference.
8. A patch array antenna according to claim 1, wherein said dielectric structure comprises an upper dielectric plate, a lower dielectric plate, a ground plate and connecting posts;
the upper dielectric plate and the lower dielectric plate are arranged in parallel and are connected through the connecting column; the antenna array is arranged on one side of the upper dielectric plate back to the lower dielectric plate; the ground plate is arranged on one side, facing the upper dielectric plate, of the lower dielectric plate, and the feed network is arranged on one side, facing away from the upper dielectric plate, of the lower dielectric plate; one end of each feed probe is connected with one antenna unit, and the other end of each feed probe penetrates through the upper-layer dielectric plate, the ground plate and the lower-layer dielectric plate to be connected with the feed network.
9. A patch array antenna according to claim 8, wherein said upper dielectric plate and said lower dielectric plate have a length of 108mm and a width of 108mm, respectively; the thickness of the upper layer medium plate is 1 mm; the thickness of the lower dielectric plate is 1 mm; the distance between the upper dielectric plate and the lower dielectric plate is 0.036 mm.
10. A patch array antenna according to claim 8, wherein said upper dielectric plate is an F4B plate; the lower medium plate is an FR4 plate; the antenna array and the grounding plate are copper plates respectively.
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| CN202210744596.0A CN114824830A (en) | 2022-06-29 | 2022-06-29 | Patch array antenna with circularly polarized side lobe suppression |
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| CN202210744596.0A CN114824830A (en) | 2022-06-29 | 2022-06-29 | Patch array antenna with circularly polarized side lobe suppression |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101552380A (en) * | 2009-05-12 | 2009-10-07 | 北京握奇数据系统有限公司 | A microstrip array antenna |
| US20090254157A1 (en) * | 2006-12-07 | 2009-10-08 | 'tst-Group' Llc | Method for optimising functional status of vegetative systems of an organism and a device for carrying out said method |
| US20110109524A1 (en) * | 2008-05-05 | 2011-05-12 | Saeily Jussi | Patch Antenna Element Array |
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| CN203326119U (en) * | 2013-07-09 | 2013-12-04 | 航天信息股份有限公司 | Narrow beam micro-strip circular polarization array antenna |
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2022
- 2022-06-29 CN CN202210744596.0A patent/CN114824830A/en not_active Withdrawn
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| US20090254157A1 (en) * | 2006-12-07 | 2009-10-08 | 'tst-Group' Llc | Method for optimising functional status of vegetative systems of an organism and a device for carrying out said method |
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| CN103022730A (en) * | 2012-12-27 | 2013-04-03 | 北京理工大学 | High-gain multilayer dielectric composite dual-circular-polarization micro-strip array antenna |
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