阅读说明：本技术 一种高隔离度初级透镜天线系统和毫米波雷达传感器 (High-isolation primary lens antenna system and millimeter wave radar sensor ) 是由 黄高昂 于 2020-12-11 设计创作，主要内容包括：本发明涉及毫米波天线技术领域,具体为一种高隔离度初级透镜天线系统和毫米波雷达传感器,包括高频电路板,高频电路板一侧面设置有微带天线,微带天线为由两个并列设置的独立天线面及其匹配传输线构成,且左边天线面为接收天线,右边天线面为发射天线,高频电路板设置有盖板,且盖板位于微带天线上方,盖板上设置有初级透镜天线,本发明通过设计收发独立并列分置的微带天线,简化了雷达射频电路,实现了雷达收发通道的高隔离度,提升了雷达的整体性能；通过共用的多级透镜天线系统实现了产品模块的小型化和整体应用的灵活性,降低了产品在生产和调试上的成本。(The invention relates to the technical field of millimeter wave antennas, in particular to a high-isolation primary lens antenna system and a millimeter wave radar sensor, which comprise a high-frequency circuit board, wherein one side surface of the high-frequency circuit board is provided with a microstrip antenna, the microstrip antenna is composed of two independent antenna surfaces arranged in parallel and a matched transmission line thereof, the left antenna surface is a receiving antenna, the right antenna surface is a transmitting antenna, the high-frequency circuit board is provided with a cover plate, the cover plate is positioned above the microstrip antenna, and the cover plate is provided with a primary lens antenna; the common multi-stage lens antenna system realizes the miniaturization of product modules and the flexibility of the whole application, and reduces the cost of the product on production and debugging.)

1. A high isolation primary lens antenna system, comprising: including high frequency circuit board (1), a side of high frequency circuit board (1) is provided with microstrip antenna (2), microstrip antenna (2) are for being formed by two independent antenna faces that set up side by side and matching transmission line, and the antenna face on the left is receiving antenna, and the antenna face on the right is transmitting antenna, high frequency circuit board (1) is provided with apron (3), and apron (3) are located microstrip antenna (2) top, be provided with elementary lens antenna (4) on apron (3).

2. The high-isolation millimeter wave sensor antenna system according to claim 1, wherein: the cover plate (3) is provided with a lens clamping ring (5), and the primary lens antenna (4) is tightly clamped on the cover plate (3) through the lens clamping ring (5).

3. The high isolation primary lens antenna system of claim 1, wherein: the cover plate (3) is fixedly connected with the high-frequency circuit board (1) through screws.

4. The high isolation primary lens antenna system of claim 1, wherein: the inner cavity of the cover plate (3) forms a cylindrical trapezoidal cavity from the plane of the microstrip antenna (2) to the plane of the primary lens antenna (4).

5. A millimeter-wave radar sensor, characterized by: including radar sensor gauge outfit (6), secondary lens antenna (7), connecting piece (8) and flange (9), be provided with the high isolation primary lens antenna system of any one of claims 1-4 in radar sensor gauge outfit (6), radar sensor gauge outfit (6) one end is connected with connecting piece (8), the one end that radar sensor gauge outfit (6) were kept away from in connecting piece (8) can be dismantled and be provided with secondary lens antenna (7), and the central line of high isolation primary lens antenna system and secondary lens antenna (7) aligns, the dismantlement that connecting piece (8) were kept away from in secondary lens antenna (7) is provided with flange (9).

6. A millimeter wave radar sensor in accordance with claim 5, wherein: radar sensor gauge outfit (6) include module casing (61) and with module casing (61) module upper cover (62) of mutually supporting, a side that module upper cover (62) are close to module casing (61) is provided with module circuit board support (63), the primary lens antenna system of high isolation is installed at module casing (61) inner chamber top, the primary lens antenna system of high isolation sets up with module casing (61) cylindrical opening central symmetry.

7. A millimeter wave radar sensor in accordance with claim 5, wherein: the connecting piece (8) is detachably connected with the radar sensor gauge outfit (6) through fine threads.

8. A millimeter wave radar sensor in accordance with claim 5, wherein: rubber rings are arranged among the radar sensor gauge outfit (6), the secondary lens antenna (7), the connecting piece (8) and the connecting flange (9) and serve as sealing materials.

Technical Field

The invention relates to the technical field of millimeter wave antennas, in particular to a high-isolation primary lens antenna system and a millimeter wave radar sensor.

Background

With the development of industrial intelligent manufacturing and industrial internet of things, higher requirements are put forward on the performance of the level radar sensor. The traditional 24 GHz-26 GHz level radar sensor is limited by physical characteristics of electromagnetic waves in the aspect of test precision due to large volume, so that the use requirement of the application occasions with high test precision and complex test environment cannot be met. Higher test precision and adaptability to complex use conditions promote continuous development of the industry. The level radar sensor adopting the frequency band of 76 GHz-81 GHz (hereinafter referred to as 80GHz) will become a new generation of mainstream products, and the receiving and transmitting antenna system of the corresponding frequency of the product has a critical influence on the final overall performance.

The radar level gauge product of 80GHz frequency channel in the current market develops faster, but the model that drops into practical at present is less, and foreign known brand product is comparatively ripe, adopts discrete chip group to establish radar system more, and the design is complicated, and the cost is higher. Meanwhile, a single antenna shared by transceiving is adopted as an electromagnetic wave transceiving channel in the design of an antenna system, and the isolation of the transceiving channel needs to be ensured by an additional radio frequency chip circuit.

In order to simplify the system, the domestic product mainly adopts a single antenna design shared by transmitting and receiving by designing a radio frequency circuit on a high-frequency circuit board, and high isolation between transmitting and receiving channels is difficult to realize, thereby affecting the performance of the final radar sensor product. Based on the technical scheme, the invention designs the high-isolation primary lens antenna system and the millimeter wave radar sensor to solve the problems.

Disclosure of Invention

The present invention is directed to a high-isolation primary lens antenna system and a millimeter-wave radar sensor, so as to solve the above technical problems.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a high isolation millimeter wave sensor antenna system, includes the high frequency circuit board, a high frequency circuit board side is provided with microstrip antenna, microstrip antenna comprises two independent antenna faces that set up side by side and matching transmission line, and the antenna face on the left is receiving antenna, and the antenna face on the right is transmitting antenna, the high frequency circuit board is provided with the apron, and the apron is located microstrip antenna top, be provided with elementary lens antenna on the apron.

Preferably, a lens clamping ring is arranged on the cover plate, and the primary lens antenna is tightly clamped on the cover plate through the lens clamping ring.

Preferably, the cover plate is fixedly connected with the high-frequency circuit board through screws.

Preferably, the inner cavity of the cover plate forms a cylindrical trapezoid cavity from the plane of the microstrip antenna to the plane of the primary lens antenna.

A millimeter wave radar sensor comprises a radar sensor gauge outfit, a secondary lens antenna, a connecting piece and a connecting flange, wherein the high-isolation primary lens antenna system as claimed in any one of claims 1 to 4 is arranged in the radar sensor gauge outfit, one end of the radar sensor gauge outfit is connected with the connecting piece, one end, away from the radar sensor gauge outfit, of the connecting piece is detachably provided with the secondary lens antenna, the high-isolation primary lens antenna system is aligned with the central line of the secondary lens antenna, and the secondary lens antenna, away from the connecting piece, is detachably provided with the connecting flange.

Preferably, the radar sensor gauge outfit includes module casing and the module upper cover of mutually supporting with module casing, a side that module upper cover is close to module casing is provided with module circuit board support, high isolation primary lens antenna system is installed at module casing inner chamber top, high isolation primary lens antenna system and the cylindrical opening central symmetry setting of module casing.

Preferably, the connecting piece and the radar sensor head are detachably connected through fine threads.

Preferably, rubber rings are arranged among the radar sensor gauge head, the secondary lens antenna, the connecting piece and the connecting flange and serve as sealing materials.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, by designing the microstrip antenna with independent receiving and transmitting, parallel arrangement and separately arranged, a radar radio frequency circuit is simplified, high isolation of a radar receiving and transmitting channel is realized, and the overall performance of the radar is improved; the common multi-stage lens antenna system realizes the miniaturization of product modules and the flexibility of the whole application, and reduces the cost of the product on production and debugging.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments 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 it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an antenna system of a high-isolation millimeter wave sensor according to the present invention;

FIG. 2 is a schematic structural diagram of the high frequency circuit board and the microstrip circuit of the present invention;

FIG. 3 is a top view of the structure of the high-isolation millimeter wave sensor antenna system of the present invention;

FIG. 4 is an exploded view of the high-isolation millimeter wave sensor antenna system of the present invention;

FIG. 5 is an exploded view of the millimeter wave radar sensor of the present invention;

fig. 6 is an exploded view of a radar sensor head according to the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

1. a high-frequency circuit board; 2. a microstrip antenna; 3. a cover plate; 4. a primary lens antenna; 5. a lens retainer ring; 6. a radar sensor gauge outfit; 61. a module housing; 62. a module upper cover; 63. a module circuit board support; 7. a secondary lens antenna; 8. a connecting member; 9. and connecting the flanges.

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 only a part of the embodiments of the present invention, and not all of the 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 invention.

Referring to fig. 1-6, the present invention provides a technical solution: the utility model provides a high isolation millimeter wave sensor antenna system, including high frequency circuit board 1, 1 side of high frequency circuit board is provided with microstrip antenna 2, microstrip antenna 2 comprises two independent antenna faces that set up side by side and matching transmission line, and the antenna face on the left side is receiving antenna, the antenna face on the right side is transmitting antenna, high frequency circuit board 1 is provided with apron 3, and apron 3 is located microstrip antenna 2 top, be provided with primary lens antenna 4 on the apron 3, receive and dispatch independent antenna group provides higher receiving and dispatching system isolation for radar sensor when can simplify radio frequency circuit, in order to realize better test accuracy.

Specifically, a lens clamping ring 5 is arranged on the cover plate 3, and the primary lens antenna 4 is tightly clamped on the cover plate 3 through the lens clamping ring 5.

Specifically, the cover plate 3 is fixedly connected with the high-frequency circuit board 1 through screws.

Specifically, the inner cavity of the cover plate 3 forms a cylindrical trapezoidal cavity from the plane of the microstrip antenna 2 to the plane of the primary lens antenna 4.

A millimeter wave radar sensor comprises a radar sensor gauge outfit 6, a secondary lens antenna 7, a connecting piece 8 and a connecting flange 9, wherein the radar sensor gauge outfit 6 is internally provided with a high-isolation primary lens antenna system of any one of claims 1 to 4, one end of the radar sensor gauge outfit 6 is connected with the connecting piece 8, one end of the connecting piece 8, which is far away from the radar sensor gauge outfit 6, is detachably provided with the secondary lens antenna 7, the high-isolation primary lens antenna system is aligned with the central line of the secondary lens antenna 7, and the secondary lens antenna 7, which is far away from the connecting piece 8, is detachably provided with the connecting flange 9; the secondary lens antenna 7, the connecting piece 8 and the connecting flange 9 are detachably connected, so that the requirement matching and equipment installation of different use environments can be realized by changing the size and practical materials of the secondary lens antenna 7; meanwhile, the matching installation of the secondary lens antenna with different sizes or the design requirement of the multi-stage lens antenna group can be realized by changing the connecting piece 8.

Specifically, radar sensor gauge outfit 6 includes module casing 61 and the module upper cover 62 of mutually supporting with module casing 61, a side that module upper cover 62 is close to module casing 61 is provided with module circuit board support 63, and high isolation primary lens antenna system is installed at module casing 61 inner chamber top, high isolation primary lens antenna system sets up with the cylindrical opening central symmetry of module casing 61.

Specifically, the connecting piece 8 and the radar sensor gauge outfit 6 are detachably connected through fine threads, so that the radar sensor gauge outfit can be installed and detached.

Specifically, rubber rings are arranged among the radar sensor gauge outfit 6, the secondary lens antenna 7, the connecting piece 8 and the connecting flange 9 to serve as sealing materials, and the sealing performance of installation among components is improved.

One specific application example of this embodiment is:

as shown in fig. 2, the microstrip antenna 2 is composed of a set of two parallel independent antenna surfaces and matching transmission lines thereof on the same high-frequency circuit board 1, wherein the left antenna surface is a receiving antenna of the radar sensor, and the right antenna surface is a transmitting antenna of the radar sensor. The antenna group with independent receiving and transmitting can simplify a radio frequency circuit and provide higher receiving and transmitting system isolation for the radar sensor at the same time so as to realize better test precision;

as shown in fig. 1, 3 and 4, the primary lens antenna system is composed of a high-frequency circuit board 1, a cover plate 3, a primary lens antenna 4, and a lens holding ring 5. Wherein apron 3 passes through the screw installation on high frequency circuit board 1, fretworks for cylindrical opening above microstrip antenna 2, and primary lens antenna 4 passes through the chucking of lens snap ring 5 and installs on apron 3. The primary lens antenna system combination structure is assembled in a radar sensor meter shell as a part of a radar sensor meter head module, and the direction of the primary lens antenna 4 is aligned with the central line of the subsequent multi-stage lens antenna.

As shown in fig. 5 and 6, a radar head module (including a primary lens antenna system assembly structure) is assembled in the radar sensor head 6, and the secondary lens antenna 7 is hermetically assembled between the connecting member 8 and the connecting flange 9, so as to form an external secondary lens antenna system assembly structure. And a blowing structure can be designed in the connecting piece 8, so that the surface attachments of the lens can be cleaned through blowing. The connecting piece 8 is connected with the gauge head 6 through fine threads. Rubber rings are arranged among the radar sensor head 6, the connecting piece 8, the secondary lens 7 and the connecting flange 9 to serve as sealing materials.

The requirement matching and equipment installation of different use environments can be realized by changing the size of the secondary lens antenna 7 and practical materials. The matching installation of the secondary lens antenna 8 with different sizes or the design requirement of the multi-stage lens antenna group can be realized by changing the connecting piece 8;

the microstrip antenna that this patent designed the independent, parallel branch of receiving and dispatching, realized the high isolation of receiving and dispatching passageway through space separation. Meanwhile, after the receiving and transmitting antenna is separated, the receiving and transmitting antenna can be independently and respectively connected with an electromagnetic wave transmitting (Tx) pin and an electromagnetic wave receiving (Rx) pin of the integrated chip, so that the design of a radio frequency circuit chip or a board level circuit for integrating a receiving channel and a transmitting channel can be simplified and removed, and the complexity of a radar system is reduced. High isolation between the receiving and dispatching antenna has decisive influence to the isolation between whole radar sensor system transmission channel and the receiving channel, and the isolation is high between the radar system receiving and dispatching channel, can greatly reduce the electromagnetic wave energy of transmission channel transmission and influence the lifting of receiving channel basement noise to improve radar system's SNR, and then promote radar sensor's measuring accuracy and test range.

The combined use of the microstrip antenna and the lens antenna can realize the miniaturization and modularization of the primary antenna system. The combination of the two can form a small antenna system, and electromagnetic wave signals are emitted to the space from a chip on a circuit board. Meanwhile, the lens antenna can also be used as a packaging outer cover to form a closed structure together with the radar module shell, so that product modularization is realized. The modularized radar module product reduces the difficulty of the whole machine assembly and improves the efficiency of the production flow.

The shared multi-stage lens antenna system reduces the product volume, can be compatible with the general traditional appearance of industrial radar sensor products, and can realize flexible change of different antenna calibers by expanding the secondary lens antenna or optimize certain specific performances by using the multi-stage lens group antenna system under the condition of keeping the primary lens module unchanged.

Meanwhile, the design method can be applied to a lens antenna system with more than two levels in an expanded mode.

In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "front", "center", "both ends", and the like, indicate orientations or positional relationships based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "disposed," "connected," "secured," "screwed" and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.

Although embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.