Waveguide horn antenna and millimeter wave radar system

Abstract

The invention discloses a waveguide horn antenna and a millimeter wave radar system, relates to the technical field of antennas, realizes the design of a waveguide antenna scheme and a radar through a step structure which is easy to process and realize, and compared with most schemes at the present stage, has the advantages of fewer processing layers, no waveguide power divider structure in the antenna, suitability for large-scale mass production with lower cost, and low cost. In addition, by designing a cross array air slot structure and an H-shaped array air slot structure, azimuth angle measurement fluctuation and channel consistency fluctuation are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of antennas, and particularly to a waveguide horn antenna and a millimeter-wave radar system. Background Art

[0002] In recent years, millimeter-wave radar sensors have been widely used in advanced driver assistance systems and environmental monitoring systems. Thanks to the performance advantages of millimeter-wave radars, detection targets in various scenarios can be detected with high precision and sensitivity in the range dimension, speed dimension, and angle dimension. With the development of the waveguide vertical interconnection technology for millimeter-wave transceiver chips, waveguide antennas have begun to be widely used in the front-end solutions of millimeter-wave radars, solving the problems of large loss and low aperture efficiency of the microstrip antenna solution.

[0003] At present, the processing of millimeter-wave radar waveguide antenna solutions usually uses dielectric materials as the base material of the antenna structure. After being processed by CNC or mold opening, the entire model structure surface is then metallized. The processing accuracy and assembly error of the entire process have high requirements for the size, shape, and complexity of the designed antenna model, directly affecting the yield rate of the final product. Summary of the Invention

[0004] The object of the present invention is to solve the above-mentioned problems, and provide a waveguide horn antenna and a millimeter-wave radar system.

[0005] The present invention provides a waveguide horn antenna, and the system includes:

[0006] A stepped transition section and a feed input section;

[0007] The stepped transition section is composed of air slots with different lengths L and different widths W;

[0008] The feed input section is composed of a WR-12 specification waveguide and a bent waveguide;

[0009] The stepped transition section is coupled to the feed input section.

[0010] As a further solution of the present invention, the stepped transition section can adjust the shape of the air slot to keep the electromagnetic wave smooth during the transition from the waveguide to the horn;

[0011] The feed input section is provided with a stepped structure at the bending part, which is used to improve the overall impedance matching of the antenna, and at the same time, the electromagnetic wave is introduced into the antenna system by connecting an external signal source.

[0012] A millimeter-wave radar system, the system includes:

[0013] A transmitting module, a receiving module, a circuit board, a chip, and a cross-array structure air slot;

[0014] The transmitting module is composed of waveguide antennas Tx1, Tx2, Tx3, Tx4, Tx5, Tx6, Tx7, and Tx8;

[0015] The receiving module is composed of waveguide antennas Rx1, Rx2, Rx3, Rx4, Rx5, Rx6, Rx7, and Rx8.

[0016] As a further solution of the present invention, the current output by the transmitting module is converted into radio waves by each group of waveguide antennas Tx1, Tx2, Tx3, Tx4, Tx5, Tx6, Tx7, and Tx8 and radiated into the surrounding space. At the same time, the output signals of each waveguide antenna can be independently adjusted in terms of frequency, power, and phase;

[0017] The receiving module is paired with the transmitting module, receives the radio waves reflected from the surrounding environment, converts the received radio waves into current through the waveguide antennas Rx1, Rx2, Rx3, Rx4, Rx5, Rx6, Rx7, and Rx8, and transmits it to the chip through the air waveguide transmission line.

[0018] As a further solution of the present invention, the depth of the air groove of the cross-array structure is half of the air wavelength corresponding to the radar operating center frequency;

[0019] The air groove of the cross-array structure can be replaced by the air groove of the H-type array structure, and the depth of the air groove of the H-type array structure is the same as that of the air groove of the cross-array structure. The center of the air groove of the cross-array structure and the H-type array structure is 1.5 times the air wavelength away from the center of the antenna unit to take into account a certain processing feasibility.

[0020] As a further solution of the present invention, between each waveguide antenna of the transmitting module and the receiving module and the chip output port, connection and transmission are carried out through an air waveguide transmission line.

[0021] Advantages of the present invention:

[0022] The present invention realizes the design of the waveguide antenna solution and the radar through a step structure that is easy to process. Compared with most current solutions, the number of processing layers is less, and there is no waveguide power divider structure inside the antenna, which is suitable for large-scale production at a lower cost. In addition, by designing the cross-array air groove structure and the H-type array air groove structure, the azimuth angle measurement fluctuation and the channel consistency fluctuation are improved. Description of the Drawings

[0023] The following further describes the present invention with reference to the drawings.

[0024] Figure 1 It is a schematic diagram of a waveguide horn antenna structure;

[0025] Figure 2 It is a structural diagram inside a waveguide horn antenna;

[0026] Figure 3 It is a side view of a waveguide horn antenna;

[0027] Figure 4 It is a top view of a waveguide horn antenna;

[0028] Figure 5 It is a schematic structural diagram of a millimeter-wave radar;

[0029] Figure 6 It is a structural diagram inside a millimeter-wave radar system under the air slot of a cross array structure;

[0030] Figure 7 It is a structural diagram inside a millimeter-wave radar system under the air slot of an H-shaped array structure;

[0031] Figure 8 It is a comparison diagram of the angular measurement fluctuations of a waveguide horn antenna and a millimeter-wave radar system;

[0032] Figure 9 It is a comparison diagram of the channel consistency fluctuations of a waveguide horn antenna and a millimeter-wave radar system. Specific implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the protection scope of the present invention.

[0034] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the protection scope of the present invention.

[0035] Embodiment 1

[0036] The embodiment of the present invention provides a waveguide horn antenna and a millimeter-wave radar system. Refer to Figure 1 , Figure 1 which is a schematic structural diagram of a waveguide horn antenna provided by the embodiment of the present invention. The system includes

[0037] a step transition section and a feed input section;

[0038] The step transition section is composed of air slots with different lengths L and different widths W; the feed input section is composed of a WR-12 specification waveguide and a bent waveguide; the step transition section is coupled to the feed input section.

[0039] Specifically, referring to Figures 1-4 it can be seen that the stepped transition section can keep the electromagnetic wave smooth during the transition from the waveguide to the horn by adjusting the shape of the air groove; the feeding input section is provided with a stepped structure at the bending position, which is used to improve the impedance matching of the overall antenna, and at the same time, the electromagnetic wave is introduced into the antenna system by connecting an external signal source.

[0040] It should be noted that referring to Figures 1-4 it can be seen that the waveguide horn antenna as a whole can be processed in two layers.

[0041] Embodiment 2

[0042] The embodiment of the present invention provides a waveguide horn antenna and a millimeter-wave radar system. Refer to Figure 1 , Figure 5 which is a schematic diagram of a millimeter-wave radar structure provided by the embodiment of the present invention. The system includes a transmitting module, a receiving module, a circuit board, a chip, and a cross-array structure air groove.

[0043] Among them, referring to Figures 5-7 it can be seen that the transmitting module is composed of Tx1, Tx2, Tx3, Tx4, Tx5, Tx6, Tx7, and Tx8 waveguide antennas; the receiving module is composed of Rx1, Rx2, Rx3, Rx4, Rx5, Rx6, Rx7, and Rx8 waveguide antennas.

[0044] Specifically, referring to Figures 5-7 , the current output by the transmitting module is converted into radio waves by each group of Tx1, Tx2, Tx3, Tx4, Tx5, Tx6, Tx7, and Tx8 waveguide antennas and radiated into the surrounding space. At the same time, the output signals of each waveguide antenna can be independently adjusted in terms of frequency, power, and phase; the receiving module is paired with the transmitting module, receives the radio waves reflected from the surrounding environment, and converts the received radio waves into current through Rx1, Rx2, Rx3, Rx4, Rx5, Rx6, Rx7, and Rx8 waveguide antennas, and transmits it to the chip through the air waveguide transmission line.

[0045] Specifically, referring to Figures 5-7 , the depth of the cross-array structure air groove is half of the air wavelength corresponding to the radar operating center frequency; the cross-array structure air groove can be replaced by an H-type array structure air groove, and the depth of the H-type array structure air groove is the same as that of the cross-array structure air groove. The centers of the cross-array structure air groove and the H-type array structure air groove are both 1.5 times the air wavelength away from the center of the antenna unit to take into account a certain processing feasibility.

[0046] Specifically, referring to Figures 5-7, between each waveguide antenna of the transmitting module and the receiving module and the chip output port, connection and transmission are carried out through an air waveguide transmission line.

[0047] It should be further noted that referring to Figures 8-9 it can be seen that the present invention realizes the design of the waveguide antenna scheme and the radar through a stepped structure that is easy to process. Compared with most current schemes, the number of processing layers is less, there is no waveguide power divider structure inside the antenna, which is suitable for large-scale production at a relatively low cost. In addition, by designing a cross-array air groove structure and an H-type array air groove structure, the azimuth angle measurement fluctuation and the channel consistency fluctuation are improved.

[0048] The above has described in detail an embodiment of the present invention, but the content described is only a preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. A waveguide horn antenna, characterized in that: include: Step transition section and feed input section; The step transition section is composed of air slots of different lengths L and different widths W; The feed input section is composed of a WR-12 specification waveguide and a curved waveguide; The step transition section is coupled to the feed input section.

2. A waveguide horn antenna according to claim 1, characterized in that: The step transition section can adjust the shape of the air slot so that the electromagnetic wave remains smooth during the transition from the waveguide to the horn; The feed input section is provided with a step structure at the bend, and the step structure is used to improve the impedance matching of the entire antenna, and at the same time, electromagnetic waves are introduced into the antenna system by connecting an external signal source.

3. A millimeter wave radar system according to claim 1, comprising: Transmitter module, receiver module, circuit board, chip and cross array structure air slot; The transmitting module is composed of Tx1, Tx2, Tx3, Tx4, Tx5, Tx6, Tx7 and Tx8 waveguide antennas; The receiving module is composed of Rx1, Rx2, Rx3, Rx4, Rx5, Rx6, Rx7 and Rx8 waveguide antennas.

4. A millimeter wave radar system according to claim 1, characterized in that: The current output by the transmitting module is converted into radio waves through the waveguide antennas of each group Tx1, Tx2, Tx3, Tx4, Tx5, Tx6, Tx7 and Tx8 and radiated to the surrounding space, and the output signal of each waveguide antenna can be independently adjusted in frequency, power and phase; The receiving module is paired with the transmitting module and receives radio waves reflected from the surrounding environment, and converts the received radio waves into electric current through Rx1, Rx2, Rx3, Rx4, Rx5, Rx6, Rx7 and Rx8 waveguide antennas, and transmits them to the chip through the air waveguide transmission line.

5. A millimeter wave radar system according to claim 1, characterized in that: The air slot depth of the cross array structure is half the air wavelength corresponding to the radar working center frequency; The cross array structure air slot can be replaced by an H-type array structure air slot, and the depth of the H-type array structure air slot is the same as that of the cross array structure air slot. The center of the cross array structure air slot and the H-type array structure air slot are spaced d from the center of the antenna unit by 1.5 times the air wavelength.

6. A millimeter wave radar system according to claim 1, characterized in that: Each waveguide antenna of the transmitting module and the receiving module is connected to the chip output port through an air waveguide transmission line for transmission.

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