CN109361074B - Pyramid horn unit antenna for inhibiting array grating lobe - Google Patents
Pyramid horn unit antenna for inhibiting array grating lobe Download PDFInfo
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- CN109361074B CN109361074B CN201811340232.6A CN201811340232A CN109361074B CN 109361074 B CN109361074 B CN 109361074B CN 201811340232 A CN201811340232 A CN 201811340232A CN 109361074 B CN109361074 B CN 109361074B
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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
- H01Q21/08—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a rectilinear path
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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
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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
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/02—Waveguide horns
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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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Abstract
The invention discloses a pyramid horn unit antenna for inhibiting array grating lobes, which comprises: at least two pyramid horn unit antennas and a combiner; the at least two pyramid horn unit antennas are arranged side by side and connected with the combiner. According to the pyramid horn antenna, at least two pyramid horn unit antennas are combined into the pyramid horn antenna with the conventional caliber size, the distance between every two pyramid horn unit antennas is shortened, and the grating lobe of the array antenna directional diagram can be effectively inhibited; and at least two compact cosine distribution aperture fields can be formed, so that the electric field distribution of the aperture of the antenna is more uniform, and larger gain and beam efficiency are obtained.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to a pyramid horn unit antenna for inhibiting array grating lobes.
Background
The millimeter wave has a wavelength between microwave and infrared, has a certain penetration capability, can distinguish objects with different physical properties according to the size of the scattering energy of the objects, and has a high spatial resolution, so that the millimeter wave is widely applied to civil and military imaging fields such as remote sensing, geographic weather, transportation, medical treatment and health, security and safety inspection, electronic countermeasure and the like, and has received wide attention of domestic and foreign researchers in recent years. The antenna can be realized by combining a pyramid horn antenna in the application of millimeter waves, wherein the pyramid horn antenna is a microwave antenna with wide application, and the radiation field of the pyramid horn antenna is determined by the size of the opening surface of a horn and the type of the antenna. As shown in fig. 1, two or more than two single pyramidal horn antennas operating in the same frequency band are generally arranged in an antenna array to suit various applications. However, due to the limitation of the manufacturing process level of the receiver connected to the antenna array, the receiver has a large volume, and even if the receivers are closely arranged, the arrangement pitch of the front-end antennas of each channel is too large, and even is more than one wavelength. According to the antenna array theory, when the array element spacing of the unit antenna is more than one wavelength, grating lobes appear in the directional diagram of the array antenna.
Domestic patent CN200720059470 discloses a power division horn antenna and an array, wherein the power division horn antenna is characterized in that a section of horn mouth surface is extended to form a section of rectangular waveguide or square waveguide on the mouth surface of a large-caliber horn antenna, then a mouth surface field is divided into smaller waveguide units in a mode of directly adding a metal sheet in the section of rectangular waveguide, and signals are radiated through the rectangular or square waveguide with smaller distance. However, the metal sheet for dividing the electric field needs to be separately processed and then assembled with the horn, so that a large error is introduced when the metal sheet is applied in a millimeter wave band, and the divided unit amplitudes are inconsistent. And because the electric field amplitude on the electric field surface (E surface) of the antenna aperture surface is more severely reduced towards the direction of the outer wall of the antenna by the dividing metal sheet, the aperture surface field is not uniform on the electric field surface (E surface).
Disclosure of Invention
The invention solves the problems: the defects of the prior art are overcome, and the pyramid horn unit antenna for inhibiting the array grating lobes is provided to solve the problem of poor imaging quality of the existing pyramid horn antenna array.
One of the technical solutions of the present invention is to provide a pyramidal horn unit antenna for suppressing array grating lobes, including: at least two pyramid horn antennas and a combiner;
the at least two pyramid horn unit antennas are arranged side by side and connected with the combiner.
The at least two pyramid horn unit antennas are arranged side by side along the E surface of the pyramid horn antenna.
The size of the feed port of the combiner is the size of a WR-28 standard waveguide port of a Ka waveband.
The combiner is internally provided with a first wedge structure, and the direction of the first wedge structure is vertical to the polarization direction of the feed port of the combiner.
The pyramid horn antenna comprises a first part and a second part which are mutually buckled and connected;
the first member includes: a first groove and a second groove; the number of the first grooves is the same as that of the pyramid horn unit antennas, the first grooves are inner cavities of the pyramid horn unit antennas, and the second grooves are inner cavities of the combiner; the first groove is communicated with the second groove, the side walls of the two sides of the first groove extend from one end communicated with the second groove to the two sides in an expanding manner, and the bottom of the first groove extends from one end communicated with the second groove in a downward inclined manner;
the second member includes: a third groove and a fourth groove; the number of the third grooves is the same as that of the pyramid horn unit antennas, the third grooves are inner cavities of the pyramid horn unit antennas, the fourth grooves are inner cavities of the combiner, the third grooves are communicated with the fourth grooves, side walls of two sides of the third grooves extend from one end communicated with the fourth grooves to two sides in an expanding mode, and the bottoms of the third grooves extend from one end communicated with the fourth grooves in a downward inclined mode;
when the first component and the second component are mutually buckled and connected, the first groove (31) and the third groove are combined to form the pyramidal horn unit antenna, and the second groove and the fourth groove are combined to form the waveguide channel of the combiner.
The first part is of an integrally formed structure, and the second part is of an integrally formed structure.
The first component is identical in structure to the second component.
And the connecting part of the outer side walls of the first part and the second part is provided with a spigot which is matched with each other.
The invention provides a second technical solution: a pyramidal horn unit antenna with suppressed array grating lobes, comprising: two pyramid horn unit antennas and a combiner;
the two pyramidal horn unit antennas are arranged side by side; the combiner is a bisection combiner, and the bisection combiner is sequentially provided with the following components from one end to the other end: two parallel first waveguide branches and one second waveguide branch; the two pyramidal horn unit antennas are respectively connected with the two parallel first waveguide branches.
And a first wedge structure is arranged on the inner wall of the waveguide channel opposite to the port of the second waveguide branch.
The invention provides a pyramid horn antenna, which combines at least two pyramid horn unit antennas into a pyramid horn antenna with a conventional size, wherein the distance between the pyramid horn unit antennas is shortened. The grating lobe of an antenna directional diagram can be effectively inhibited, so that the imaging quality is improved; because each branch unit is still a horn antenna unit, currents pass through the same inclined wall on two sides of the E surface, electric fields formed on the small unit aperture surface are more uniform on the E surface, and at least two compact cosine distribution aperture surface fields can be formed, so that higher gain and beam efficiency are obtained.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic diagram of a prior art pyramidal horn antenna arranged as an antenna array;
fig. 2 is a perspective view of a pyramidal horn antenna according to an embodiment of the present invention;
fig. 3 is a top view of a pyramidal horn antenna according to an embodiment of the present invention;
fig. 4 is a diagram illustrating a cosine distribution aperture field effect of a pyramidal horn antenna according to an embodiment of the present invention;
fig. 5 is another perspective view of a pyramidal horn antenna according to an embodiment of the present invention;
fig. 6 is a perspective view of a first component of a pyramidal horn antenna according to an embodiment of the present invention;
fig. 7 is a schematic diagram of an internal structure of a first component of a pyramidal horn antenna according to an embodiment of the present invention;
fig. 8 is a left side view of a pyramidal horn antenna according to an embodiment of the present invention;
fig. 9 is a right side view of a pyramidal horn antenna according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of an antenna array according to an embodiment of the present invention.
In the figure:
1 pyramid horn antenna; 2, a combiner; 21 a first waveguide branch; 22 a second waveguide branch; 23 a feed port; 24 a first wedge structure; 25 transition waveguide branches; 3 a first component; 31 a first groove; 32 a second groove; 321 a fifth groove; 322 a sixth groove; 33, stopping at the seam; 34 a second wedge structure; 4 second part.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. 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 invention.
Example 1
As shown in fig. 2 and fig. 3, a pyramidal horn unit antenna for suppressing array grating lobes according to an embodiment of the present invention includes: at least two pyramidal horn antennas 1 and a combiner 2.
The at least two horn antennas 1 are arranged side by side, and the at least two horn antennas 1 are connected with the combiner 2.
The combiner 2 can integrate two or more paths of signals received by the horn antenna 1 into one path of signal to be transmitted to a receiver, or divide one path of signal into two or more paths of signals to be transmitted to the horn antenna 1 for transmission.
As shown in fig. 2, in the embodiment of the present invention, the at least two horn antennas 1 are arranged side by side along the E-plane of the horn antenna. The E-plane is a directional pattern tangential plane parallel to the direction of the electric field.
By connecting at least two pyramid horn antennas 1 with the combiner 2 to be combined into one pyramid horn antenna, at least two compact cosine distribution aperture fields can be formed, which are shown in fig. 4. The design of the at least two compact cosine distribution aperture fields enables the electric field distribution of the antenna aperture to be more uniform, thereby obtaining larger gain and beam efficiency. It should be noted that, as shown in fig. 2 to fig. 4, the pyramidal horn antenna includes two pyramidal horn antennas 1, and the cosine distribution aperture surface field is also two, but the pyramidal horn antenna is not limited to include only two pyramidal horn antennas 1, and may include three, four, five, and so on.
In a preferred example of the embodiment of the present invention, the size of each waveguide branch in the combiner 2 is a WR-28 standard waveguide port of a Ka band, which ensures that an electric field in each waveguide branch of the combiner 2 is transmitted as a main mode.
A first wedge structure 24 is arranged in the combiner 2, and the first wedge structure 24 may split one signal into two signals, or combine two signals into one signal, and may be arranged at a branch of the waveguide channel. The direction of the first wedge structure 24 is the direction of the tip length thereof, and is perpendicular to the polarization direction of the feed port 23 of the combiner 2 and also perpendicular to the transmission direction of signals. In the application of the embodiment of the present invention, the polarization direction is a horizontal direction and is parallel to the E-plane, as indicated by the arrow in fig. 3. The first wedge structure 24 not only can split one signal into two signals for transmission, but also can enable the transmission of the signals to have good voltage standing wave ratio and broadband characteristics.
The at least two pyramidal horn unit antennas are combined into the pyramidal horn antenna with the conventional size, the distance between the pyramidal horn unit antennas is shortened, the grating lobe of an antenna directional diagram can be effectively restrained, and therefore the imaging quality is improved.
Example 2
As shown in fig. 5, the pyramidal horn antenna provided by the embodiment of the present invention includes a first component 3 and a second component 4 that can be fastened to each other.
As shown in fig. 6 and 7, the first member 3 includes: a first groove 31 and a second groove 32; the number of the first grooves 31 is the same as that of the horn antennas 1, the first grooves 31 are inner cavities of the horn antennas 1, and the second grooves 32 are inner cavities of the combiner 2; the first groove 31 is communicated with the second groove 32, the side walls of the two sides of the first groove 31 extend from one end communicated with the second groove 32 to the two sides in an expanding way, and the bottom of the first groove 31 extends from one end communicated with the second groove 32 in a downward inclined way.
The second member 4 includes: a third groove and a fourth groove; the number of the third grooves is the same as that of the pyramidal horn antennas 1, the third grooves are the inner cavities of the pyramidal horn antennas 1, the fourth grooves are the inner cavities of the combiner 2, the third grooves are communicated with the fourth grooves, the side walls of the two sides of the third grooves extend from one ends communicated with the fourth grooves to the two sides in an expanding mode, and the bottoms of the third grooves extend from one ends communicated with the fourth grooves in a downward inclining mode.
When the first component 3 and the second component 4 are fastened and connected with each other, the first groove 31 and the third groove are combined to form the pyramidal horn antenna 1, and the second groove 32 and the fourth groove are combined to form a wave guide channel of the combiner 2.
Preferably, the first part 3 is of an integrally formed construction and the second part 4 is of an integrally formed construction.
In a preferred example of the present embodiment, the first member 3 is identical in structure to the second member 4.
The corner structures of the first part 3 and the second part 4 can adopt chamfer structures so as to be easier to machine.
In the embodiment of the invention, the first component 3 and the second component 4 adopt the same structure and are in an integrally formed structure, so that the antenna can be processed by a milling machine, the processing efficiency can be improved, the processing cost can be reduced, and the antenna is simple and convenient to assemble.
In a specific implementation, the first part 3 and said second part 4 can be connected by means of screws (not shown in the figures). It should be noted that the connection manner of the first member 3 and the second member 4 is not particularly limited.
In a specific implementation, the connecting portion of the outer side walls of the first component 3 and the second component 4 is provided with a spigot 33 which is matched with each other. Preferably, the connection part of the outer side walls of the first part 3 and the second part 4 is provided with a convex structure on one side and a concave structure on the other side, when the first part 3 and the second part 4 are mutually buckled, the convex structure can be embedded into the concave structure, and the first part 3 and the second part 4 are jointed into a complete pyramidal horn antenna through the seam 33.
In the embodiment of the present invention, the pyramidal horn antenna provided in embodiment 1 is divided into equal parts perpendicularly to obtain the same first part 3 and the same second part 4. Similarly, the first member 3 and the second member 4 may be divided vertically or horizontally, but they may be divided vertically or horizontally. It should be noted that the pyramidal horn antenna provided in embodiment 1 may be arbitrarily divided, and then the divided components are assembled to form a complete pyramidal horn antenna, so that the dividing form of the pyramidal horn antenna provided in embodiment 1, that is, the specific structure of the divided components, is not limited herein.
Example 3
As shown in fig. 2 and 3, an embodiment of the present invention provides a pyramidal horn antenna, including: two pyramid horn antennas 1 and a combiner 2.
The two pyramidal horn antennas 1 are arranged side by side; the combiner 2 is a bisection combiner, and the bisection combiner is an E-plane waveguide type bisection combiner.
Specifically, the halving combiner is provided with the following components in sequence from one end to the other end: two parallel first waveguide branches 21 and one second waveguide branch 22; the two pyramidal horn antennas 1 are respectively connected with the two parallel first waveguide branches 21. The two parallel first waveguide branches 21 are respectively connected with one second waveguide branch 22 through a transition waveguide branch 25. The waveguide channel of the halving combiner is Y-shaped.
As shown in fig. 5, a horn antenna according to an embodiment of the present invention includes a first element 3 and a second element 4, where the first element 3 and the second element 4 have the same structure, and when the first element 3 and the second element 4 are engaged with each other, a complete horn antenna can be formed. The first member 3 and the second member 4 may have substantially the same structure as a cut member formed by vertically equally dividing a pyramidal horn antenna as shown in fig. 2.
As shown in fig. 7, the first member 3 includes: a first recess 31 and a second recess 32. The number of the first grooves 31 is two, the first groove 31 is an inner cavity of the horn antenna 1, the first groove 31 is communicated with the second groove 32, side walls of two sides of the first groove 31 extend from one end communicated with the second groove 32 to two sides in an expanding manner, and the bottom of the first groove 31 extends from one end communicated with the second groove 32 in a downward inclining manner. The second groove 32 is an inner cavity of the combiner 2. Since the bisection combiner includes two parallel first waveguide branches 21 and one second waveguide branch 22, correspondingly, the second groove 32 includes two parallel fifth grooves 321 and one sixth groove 322.
When the first part 3 and the second part 4 are mutually buckled, the upper and lower first grooves 31 can be combined into the inner cavity of the pyramidal horn antenna 1, and the upper and lower second grooves 32 can be combined into the inner cavity of the combiner 2.
As shown in fig. 3, a first wedge structure 24 is disposed on the inner wall of the waveguide channel opposite to the port of the second waveguide branch 22, and one transmission signal can be divided into two signals for transmission after passing through the wedge structure. Correspondingly, as shown in fig. 7, the groove wall opposite to the notch of the sixth groove 322 is provided with a second wedge structure 34, and the second wedge structure 34 is half of the first wedge structure 24. When the first component 3 and the second component 4 are fastened to each other, the two second wedge structures 34 are fastened up and down to form the first wedge structure 24.
The first wedge structure 24 is oriented perpendicular to the polarization direction of the feed port 23 of the combiner 2 and also perpendicular to the transmission direction of the signal. In a specific application of the present embodiment, the plane E is parallel to the horizontal plane, and the polarization direction of the feed port 23 of the combiner 2 is also parallel to the horizontal plane, so the direction of the wedge structures is the vertical direction. The arrangement of the wedge structure can enable the antenna to have good voltage standing wave ratio and broadband characteristics.
In the embodiment of the present invention, the two parallel first waveguide branches 21 and the one second waveguide branch 22 have the size of the WR-28 standard waveguide port of the Ka band, so that the two TE branches10Moulding into a path of TE10And the two paths of signals are transmitted in the same amplitude and phase. The transition waveguide branch 25 between the two parallel first waveguide branches 21 and the second waveguide branch 22 adopts a matching structure, the distance between the wedge edge of the first wedge structure 24 and the edge of the second waveguide branch 22 is not more than 7.12mm, so that the power division part can not generate a high-order mode due to the over-fast expansion of the waveguide size, the transition waveguide branch 25 can not be too long due to the limited distance between the two units, the propagation direction of the waveguide electric field needs to be twisted by 90 degrees in order to be connected with the first waveguide branch 21, the corner of the waveguide branch 25 is optimally designed, the high-order mode can not be generated in a compact space in the area surrounded by the bevel edge of the waveguide branch 25 and the bevel edge of the first wedge structure 24, the space limitation requirement is met, the high-order mode and strong reflection are not generated, and the size of a waveguide channel most suitable for signal transmission is finally obtained, so as to minimize signal reflections, the matching structure can be calculated by simulation.
In a specific application, when a signal enters the feeding port of the pyramidal horn antenna 1 from the opening surface of the pyramidal horn antenna, TE fed by the two pyramidal horn antennas 110The modes may be combined sequentially through a combiner 2 intoAnd (6) one path of signal.
Preferably, as shown in fig. 4, the pyramidal horn antenna provided by the present invention has a length l of 50mm, a width d of 22mm, and a height h of 22.8 mm; as shown in fig. 8, the length f of the port of the pyramidal horn antenna 1 connected to the combiner 2 is 7.12mm, and the width e is 3.56 mm; as shown in fig. 9, the feed port 23 of the combiner 2 has a length b of 7.12mm and a width a of 3.56 mm.
As shown in fig. 10, the horn antennas may be arranged side by side along the plane E, and arranged in an antenna array, and each horn antenna may be regarded as an array element. Compared with the conventional pyramid horn antenna with the same size, the pyramid horn antenna provided by the embodiment of the invention has the advantages that the array element spacing of the antenna array can be equivalently reduced to 1/2 of the conventional unit antenna spacing, the grating lobe of an antenna directional diagram can be effectively inhibited, and the imaging quality is improved. For example, in the field of view of the camera-shooting type millimeter wave human body security inspection instrument, grating lobes can be effectively inhibited within-20 to 20 degrees of an azimuth plane, so that the imaging quality is improved. It should be noted that the pyramidal horn antenna provided in the embodiments of the present invention may be applied to multiple locations, and is not limited herein.
While preferred embodiments of the present invention 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 preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
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 pyramidal horn antenna and the antenna array provided by the present invention are described in detail above, and the principle and the implementation of the present invention are explained in the present document by applying specific examples, and the description of the above examples is only used to help understanding the method of the present invention and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (5)
1. A pyramidal horn unit antenna for suppressing array grating lobes, comprising: at least two pyramidal horn antennas (1) and a combiner (2);
the at least two pyramid horn antennas (1) are arranged side by side, and the at least two pyramid horn antennas (1) are connected with the combiner (2);
the at least two pyramid horn antennas (1) are arranged side by side along the E surface of the pyramid horn unit antenna;
the size of a feed port (23) of the combiner (2) is the size of a WR-28 standard waveguide port of a Ka waveband;
a first wedge structure (24) is arranged in the combiner (2), and the direction of the first wedge structure (24) is perpendicular to the polarization direction of a feed port (23) of the combiner (2);
the pyramid horn unit antenna is formed by buckling a first part (3) and a second part (4) which are mutually buckled and connected;
the first part (3) comprises: a first groove (31) and a second groove (32); the number of the first grooves (31) is the same as that of the pyramidal horn antenna (1), the first grooves (31) are inner cavities of the pyramidal horn antenna (1), and the second grooves (32) are inner cavities of the combiner (2); the first groove (31) is communicated with the second groove (32), the side walls of the two sides of the first groove (31) extend from one end communicated with the second groove (32) to the two sides in an expanding way, and the bottom of the first groove (31) extends from one end communicated with the second groove (32) in a downward inclined way;
the second part (4) comprises: a third groove and a fourth groove; the number of the third grooves is the same as that of the pyramid horn antennas (1), the third grooves are inner cavities of the pyramid horn antennas (1), the fourth grooves are inner cavities of the combiner (2), the third grooves are communicated with the fourth grooves, side walls of two sides of the third grooves extend from one end communicated with the fourth grooves to two sides in an expanding mode, and the bottoms of the third grooves extend from one end communicated with the fourth grooves in a downward inclined mode;
when the first component (3) and the second component (4) are mutually buckled and connected, the first groove (31) and the third groove are combined to form the pyramidal horn antenna (1), and the second groove (32) and the fourth groove are combined to form a waveguide channel of the combiner (2).
2. The pyramidal horn unit antenna with suppressed array grating lobes as set forth in claim 1, wherein: the first part (3) is of an integrally formed structure, and the second part (4) is of an integrally formed structure.
3. The pyramidal horn unit antenna with suppressed array grating lobes as set forth in claim 1 or 2, wherein: the first part (3) is identical to the second part (4).
4. The pyramidal horn unit antenna with suppressed array grating lobes as set forth in claim 1, wherein: and the connecting part of the outer side walls of the first part (3) and the second part (4) is provided with a spigot (33) which is matched with each other.
5. The utility model provides a pyramid horn unit antenna of suppression array grating lobe which characterized in that: the method comprises the following steps: two pyramid horn antennas (1) and a combiner (2);
the two pyramidal horn antennas (1) are arranged side by side; the combiner (2) is a halving combiner, and the halving combiner is sequentially provided with the following components from one end to the other end: two parallel first waveguide branches (21) and one second waveguide branch (22); the two pyramidal horn antennas (1) are respectively connected with the two parallel first waveguide branches (21);
a first wedge structure (24) is arranged on the inner wall of the waveguide channel opposite to the port of the second waveguide branch (22);
the pyramid horn antenna comprises a first part (3) and a second part (4) which are mutually buckled and connected;
the first part (3) comprises: a first groove (31) and a second groove (32); the number of the first grooves (31) is the same as that of the pyramidal horn antenna (1), the first grooves (31) are inner cavities of the pyramidal horn antenna (1), and the second grooves (32) are inner cavities of the combiner (2); the first groove (31) is communicated with the second groove (32), the side walls of the two sides of the first groove (31) extend from one end communicated with the second groove (32) to the two sides in an expanding way, and the bottom of the first groove (31) extends from one end communicated with the second groove (32) in a downward inclined way;
the second part (4) comprises: a third groove and a fourth groove; the number of the third grooves is the same as that of the pyramid horn antennas (1), the third grooves are inner cavities of the pyramid horn antennas (1), the fourth grooves are inner cavities of the combiner (2), the third grooves are communicated with the fourth grooves, side walls of two sides of the third grooves extend from one end communicated with the fourth grooves to two sides in an expanding mode, and the bottoms of the third grooves extend from one end communicated with the fourth grooves in a downward inclined mode;
when the first component (3) and the second component (4) are mutually buckled and connected, the first groove (31) and the third groove are combined to form the pyramidal horn antenna (1), and the second groove (32) and the fourth groove are combined to form a waveguide channel of the combiner (2).
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| JP2017044689A (en) * | 2015-08-27 | 2017-03-02 | 日本電産エレシス株式会社 | Radar antenna and radar device |
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