CN215989267U

CN215989267U - Millimeter wave array antenna with asymmetric main lobe beam

Info

Publication number: CN215989267U
Application number: CN202122763083.8U
Authority: CN
Inventors: 汪中岳; 邓斌
Original assignee: Changsha Microbrain Intelligent Technology Co ltd
Current assignee: Changsha Microbrain Intelligent Technology Co ltd
Priority date: 2021-11-12
Filing date: 2021-11-12
Publication date: 2022-03-08
Anticipated expiration: 2031-11-12

Abstract

The utility model belongs to the field of millimeter wave radars, and discloses a millimeter wave array antenna with asymmetric main lobe beams, which comprises a dielectric slab, a floor layer and an array antenna arranged on the dielectric slab, wherein the array antenna comprises a feeder line and an even number of array elements, the feeder line comprises two sections which are vertical to each other, the array elements are arranged on the feeder line section which is vertical to the main lobe direction of the beams, the array elements are symmetrically arranged according to the size, the size of the middle array element is the largest, and the size of the array element which is farther away from the middle array element is smaller. The main lobe of the antenna is designed into an asymmetric form by adjusting the spacing of the array elements, and the main lobe is tilted by an angle, so that the probability of missing detection and report is reduced, and the influence of ground sundries is reduced.

Description

Millimeter wave array antenna with asymmetric main lobe beam

Technical Field

The utility model belongs to the technical field of millimeter wave radars, and particularly relates to a millimeter wave array antenna with asymmetric main lobe beams.

Background

The civil millimeter wave radar has great advantages in cost and practicability compared with laser radar and video image capturing technology as a high and new industry which is developed vigorously at present. The gate installed at the entrance of the parking lot is one of widely applied scenes, and as shown in a simple parking lot gate system schematic diagram shown in an attached drawing 1, (1) is a gate railing, (2) is a base, (3) is a millimeter wave trigger radar, (4) is an entrance deceleration strip, (5) is a main lobe of an antenna of the millimeter wave radar, and (6) is a side lobe of the millimeter wave radar antenna. For some automobiles with lower chassis, the narrow beam can cause radar missing detection, and the risk of collision of the automobile exists. When the level of a side lobe (6) of the millimeter wave radar antenna is high, the radar easily detects a deceleration strip or other sundries on the ground, and the false alarm of the elastic rod is caused.

In order to solve the problem of false alarm or missing detection of the elastic rod of the parking lot gate, the radiation direction of the antenna can be adjusted by a technical means starting from a millimeter wave antenna array. The method for realizing beam scanning generally comprises the following steps: the method for adjusting the beam direction, such as mechanical scanning, changes the beam direction by adjusting the mechanical rotation of the device, is heavy, insensitive to reaction, needs to change the position of the gate base, and is troublesome to use. In addition, the method for realizing beam deflection comprises analog and digital beam forming, which needs a more complex feed network and higher cost, can adjust beam direction in a large range, but has higher design difficulty and complexity, and is not beneficial to being integrated on small-sized civil radar products. The method for adding the metamaterial comprises the following steps: the array is mostly of a multilayer or 3D structure, and phase change caused by the change of the distance between the array layer and the metamaterial layer is difficult to control accurately; the method for increasing the reflection array is a technology which is mostly applied to military large-scale radars, can realize high-precision tracking, has large size and is not suitable for small civil radar products.

SUMMERY OF THE UTILITY MODEL

In view of the above, the utility model provides an asymmetric array antenna with a working frequency of 77GHz to 81GHz designed based on a high-frequency plate of Rogers 4830 model aiming at the phenomenon of false alarm or missing detection of a parking gate elastic rod. The phase is adjusted by adjusting the distance between the array elements, so that the beam direction of the whole array antenna is changed, current distribution with different amplitudes is realized by adopting the array elements with different sizes, and sidelobe levels are compressed.

The utility model discloses a millimeter wave array antenna with asymmetric main lobe beams, which comprises a dielectric slab, a floor layer and an array antenna arranged on the dielectric slab, wherein the array antenna comprises a feeder line and an even number of array elements, the feeder line comprises two mutually perpendicular sections, the array elements are arranged on the section of the feeder line perpendicular to the main lobe direction of the beams, the array elements are symmetrically arranged according to the size, the middle array element has the largest size, and the array elements farther away from the middle array element have smaller sizes.

Further, the thickness of the medium plate is 0.127 mm.

Further, the floor layer has a length, a width and a height of 35mm,32mm and 0.025 mm.

Further, when the main lobe beam deflection angle is 4 degrees, the distance between the array elements is 1 mm.

Further, when the main lobe beam deflection angle is 6 degrees, the distance between the array elements is 1.05 mm.

Further, the operating frequency of the millimeter wave array antenna is 77GHz to 81 GHz.

The utility model has the following beneficial effects:

the main lobe of the antenna is designed into an asymmetric form by adjusting the spacing of the array elements, and the main lobe of the antenna upwarps by an angle, so that the probability of missing detection and missing report is reduced, and the influence of ground sundries is effectively reduced.

Drawings

FIG. 1 is a parking lot gate system;

FIG. 2 is a front view of the antenna structure of the present invention;

FIG. 3 is a side view of the antenna structure of the present invention;

FIG. 4 is a graph of S parameters for an array antenna of the present invention;

FIG. 5 is a two dimensional pattern pitch plane of an array of the present invention;

fig. 6 an antenna pattern of a symmetric beam antenna array;

FIG. 7 is an antenna pattern for an asymmetric beam of the present invention;

figure 8 a three-dimensional pattern of a symmetric beam antenna array;

fig. 9 shows three-dimensional patterns of the asymmetric antenna of the present invention with different main lobes raised by 4 degrees;

fig. 10 shows three-dimensional directional diagrams of the asymmetric antenna of the present invention with different main lobes raised by 8 degrees.

Wherein 1 is the floodgate railing, 2 is the base, and 3 are millimeter wave trigger radar, and 4 are the entry deceleration strip, and 5 are the main lobe of millimeter wave radar's antenna, 6 are the side lobe of millimeter wave radar antenna, and 7 are the floor layer, 8 are the dielectric layer, and 9 are asymmetric antenna, and 10 are the array element, and 11 are the feeder.

Detailed Description

The utility model is further described with reference to the accompanying drawings, but the utility model is not limited in any way, and any alterations or substitutions based on the teaching of the utility model are within the scope of the utility model.

As shown in fig. 2 and 3, the present invention is an asymmetric array antenna having an operating frequency of 77GHz to 81 GHz. The phase is adjusted by adjusting the distance between the array elements, so that the beam direction of the whole array antenna is changed, current distribution with different amplitudes is realized by adopting the array elements with different sizes, and sidelobe levels are compressed. Millimeter wave array antenna, including dielectric plate (7) and floor layer (8) and array antenna (9), array antenna includes a plurality of array element (10), a millimeter wave array antenna with asymmetric main lobe beam, including dielectric plate (7), floor layer (8) and array antenna (9) of setting on dielectric plate (8), array antenna (9) include feeder (11) and even number array element (10), the feeder includes two sections of mutually perpendicular, the array element sets up on the section feeder perpendicular with wave beam main lobe direction, the array element's range sets up according to size symmetry, wherein middle array element size is the biggest, the array element size that is far away from middle array element is the less.

The high-frequency material adopted by the dielectric plate (8) is Rogers 4830 type high-frequency plate, the dielectric constant and the loss angle are respectively 3.2 and 0.0033, and the thickness is 0.127 mm.

The floor layer (7) has a length, width and height of 35mm,32mm and 0.025 mm.

Fig. 4 shows the S-parameter of the array antenna of the present invention, with the abscissa of the graph being frequency, in GHz. The ordinate is the S parameter value in dB. As can be seen, the asymmetric antenna has good working capability within the bandwidth of 77GHz-81 GHz.

Fig. 5 is a two-dimensional directional diagram of a pitch Plane (E-Plane) of the array of the present invention, the abscissa of the graph represents different angles, the ordinate is a gain value, the unit dBi, different curves represent different frequency points, the gain of the antenna array of the present invention is greater than 10dBi in the working bandwidth from 77GHz to 81GHz, the main lobe is asymmetric, and the maximum points to an offset with a certain angle.

Fig. 6 and 7 are antenna patterns with a symmetric beam antenna and an asymmetric beam of the present invention, all elements of the prior art symmetric beam antenna of fig. 6 being of the same size. Compared with the prior art, the beam has the advantages of raised main lobe beam and low side lobe level, and can obviously reduce the influence of impurities on the ground.

Fig. 8 is a three-dimensional pattern of a symmetric antenna, and fig. 9-10 are three-dimensional patterns of asymmetric antennas at different main lobe uplift angles. The utility model can select different angles according to different detection requirements, for example, fig. 9 and 10 are three-dimensional directional diagrams with main lobes raised by 4 degrees and 8 degrees respectively. The utility model realizes the phase adjustment by adjusting the spacing between the array elements, thereby changing the beam direction of the whole array antenna. Different deflection angles of the antenna are realized by increasing a spacing difference factor delta, the value of delta can be positive and negative, and the deflection angle can be changed by changing delta: for example, when δ is 0, the pitch d is 1mm, and the angular deflection is 4 degrees; when δ is 0.05mm, the spacing d + δ is 1.05mm, at which point the angle is deflected by 6 degrees.

The utility model has the following beneficial effects:

The word "preferred" is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as "preferred" is not necessarily to be construed as advantageous over other aspects or designs. Rather, use of the word "preferred" is intended to present concepts in a concrete fashion. The term "or" as used in this application is intended to mean an inclusive "or" rather than an exclusive "or". That is, unless specified otherwise or clear from context, "X employs A or B" is intended to include either of the permutations as a matter of course. That is, if X employs A; b is used as X; or X employs both A and B, then "X employs A or B" is satisfied in any of the foregoing examples.

Also, although the disclosure has been shown and described with respect to one or an implementation, equivalent alterations and modifications will occur to others skilled in the art based upon a reading and understanding of this specification and the annexed drawings. The present disclosure includes all such modifications and alterations, and is limited only by the scope of the appended claims. In particular regard to the various functions performed by the above described components (e.g., elements, etc.), the terms used to describe such components are intended to correspond, unless otherwise indicated, to any component which performs the specified function of the described component (e.g., that is functionally equivalent), even though not structurally equivalent to the disclosed structure which performs the function in the herein illustrated exemplary implementations of the disclosure. In addition, while a particular feature of the disclosure may have been disclosed with respect to only one of several implementations, such feature may be combined with one or other features of the other implementations as may be desired and advantageous for a given or particular application. Furthermore, to the extent that the terms "includes," has, "" contains, "or variants thereof are used in either the detailed description or the claims, such terms are intended to be inclusive in a manner similar to the term" comprising.

Each functional unit in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or a plurality of or more than one unit are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium. The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Each apparatus or system described above may execute the storage method in the corresponding method embodiment.

In summary, the above-mentioned embodiment is an implementation manner of the present invention, but the implementation manner of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be regarded as equivalent replacements within the protection scope of the present invention.

Claims

1. A millimeter wave array antenna with asymmetric main lobe beams comprises a dielectric slab and a floor layer and is characterized by further comprising an array antenna arranged on the dielectric slab, wherein the array antenna comprises a feeder line and an even number of array elements, the feeder line comprises two sections which are perpendicular to each other, the array elements are arranged on the feeder line section which is perpendicular to the main lobe direction of the beams, the array elements are symmetrically arranged according to the size, the middle array element is largest in size, and the array elements which are farther away from the middle array element are smaller in size.

2. The millimeter-wave array antenna with an asymmetric main lobe beam according to claim 1, wherein the dielectric plate thickness is 0.127 mm.

3. The millimeter-wave array antenna with an asymmetric main lobe beam according to claim 1, wherein the floor layer has a length, a width and a height of 35mm,32mm and 0.025mm, respectively.

4. The millimeter wave array antenna with an asymmetric main lobe beam according to claim 1, wherein the distance between the array elements is 1mm when the main lobe beam deflection angle is 4 degrees.

5. The millimeter wave array antenna with an asymmetric main lobe beam according to claim 1, wherein the distance between the array elements is 1.05mm when the main lobe beam deflection angle is 6 degrees.

6. The millimeter-wave array antenna with an asymmetric main lobe beam according to claim 1, wherein the operating frequency of the millimeter-wave array antenna is 77GHz to 81 GHz.