Millimeter wave radar antenna

Abstract

The embodiment of the utility model provides a millimeter-wave radar antenna, which comprises a dielectric substrate, a radar chip arranged on the surface of one side of the dielectric substrate, and a plurality of receiving antennas and a plurality of transmitting antennas, wherein the head ends of the receiving antennas and the transmitting antennas are correspondingly connected to the radar chip through microstrip lines respectively. The receiving antennas and the transmitting antennas are linear array antennas which are equal in length and arranged on the surface of the same side of the dielectric substrate, the receiving antennas and the transmitting antennas are arranged on the surface of the dielectric substrate in parallel, the tail ends of the transmitting antennas are correspondingly flush, the tail ends of the receiving antennas are correspondingly flush, and the tail ends of the receiving antennas are correspondingly flush. The number of the receiving antennas is four, and the distance between every two adjacent receiving antennas is one wavelength, three wavelengths and two wavelengths in sequence. According to the embodiment, the angular resolution of the radar can be increased by using the existing radar chip, and the cost is reduced.

Description

Technical Field

[0001] The embodiment of the utility model relates to the technical field of radar antennas, and in particular to a millimeter wave radar antenna. Background Art

[0002] A millimeter-wave radar antenna generally includes a dielectric substrate and a radar chip, a receiving antenna, and a transmitting antenna, all of which are arranged on the front side of the dielectric substrate. In addition, most existing millimeter-wave radar antennas use one or two transmitting antennas, which can effectively measure the speed and distance of obstacles. As the demand for use increases, the angular resolution requirements of millimeter-wave radar antennas are getting higher and higher. In traditional solutions, in order to improve the angular resolution of millimeter-wave radar antennas, the number of receiving antennas and transmitting antennas connected to the radar chip is usually increased, and the aperture of the array antenna is increased. However, the increase in the number of receiving antennas and transmitting antennas requires the radar chip to have more receiving ports and transmitting ports, as well as more RF transceiver channels. Radar chips that meet the above conditions need to be redeveloped and produced, and the cost is relatively high. Utility Model Content

[0003] The technical problem to be solved by the embodiments of the utility model is to provide a millimeter wave radar antenna that can utilize existing radar chips to increase the angular resolution of the radar and reduce costs.

[0004] In order to solve the above technical problems, the embodiment of the utility model provides the following technical solutions: a millimeter wave radar antenna, comprising a dielectric substrate, a radar chip arranged on one side surface of the dielectric substrate, and a plurality of receiving antennas and a plurality of transmitting antennas respectively connected to the receiving ports and the transmitting ports of the radar chip at their head ends through microstrip lines, each receiving antenna and each transmitting antenna are linear array antennas of equal length and arranged on the same side surface of the dielectric substrate, each receiving antenna and each transmitting antenna are arranged in parallel on the surface of the dielectric substrate, the tail ends of each transmitting antenna are correspondingly flush, and the tail ends of each receiving antenna are also correspondingly flush, there are four receiving antennas, and the spacing between two adjacent receiving antennas is one wavelength, three wavelengths and two wavelengths respectively.

[0005] Furthermore, there are three transmitting antennas.

[0006] Furthermore, the spacing between two adjacent transmitting antennas is thirteen wavelengths and a predetermined optional spacing in sequence, and the predetermined optional spacing is two and a half wavelengths or half a wavelength.

[0007] Furthermore, the two transmitting antennas with a spacing of thirteen wavelengths are respectively arranged on opposite sides of the area where the transmitting antennas are arranged on the dielectric substrate.

[0008] Furthermore, the tail end of each receiving antenna protrudes outward by a predetermined length compared to the tail end of each transmitting antenna.

[0009] Furthermore, the microstrip lines connecting the receiving antennas are bent and extended on the dielectric substrate with equal length; and the microstrip lines connecting the transmitting antennas are bent and extended on the dielectric substrate with equal length.

[0010] Furthermore, the radar chip, the multiple receiving antennas and the multiple transmitting antennas are all arranged on the same side surface of the dielectric substrate, and the millimeter-wave radar antenna also includes a first ground plate arranged on the surface of the dielectric substrate and provided with hollow holes at positions corresponding to the radar chip and each of the microstrip lines, and a predetermined gap is provided between the edges of the hollow holes around the radar chip and on both sides of any part of each microstrip line.

[0011] Furthermore, the millimeter-wave radar antenna also includes a second ground plate which is arranged on two opposite sides of the dielectric substrate with respect to the first ground plate. The first ground plates on both sides of each microstrip line along the line are also evenly provided with metal vias which penetrate the first ground plate, the dielectric substrate and the second ground plate in sequence. Metal columns are installed in the metal vias to electrically connect the first ground plate and the second ground plate.

[0012] Furthermore, the linear array antenna is a string antenna or a comb antenna.

[0013] After adopting the above technical scheme, the embodiment of the utility model has at least the following beneficial effects: the embodiment of the utility model sets four receiving antennas, arranges the receiving antennas in parallel and at intervals, and the spacing between two adjacent receiving antennas is one wavelength, three wavelengths and two wavelengths respectively. The above four receiving antennas can be virtualized into twelve simulated antennas through the MIMO (multiple-in multiple-out) algorithm. After specific experimental measurements, it is found that the twelve virtual simulated antennas, in combination with the corresponding transmitting antennas, can effectively realize the detection of the target, and the angular resolution is also relatively large. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The figure is a schematic diagram of the planar structure of an optional embodiment of the millimeter wave radar antenna of the utility model.

[0015] Figure 2 This is a partial cross-sectional schematic diagram perpendicular to a dielectric substrate and a microstrip line of an optional embodiment of the millimeter-wave radar antenna of the utility model.

[0016] Figure 3 This is a schematic diagram of a virtual antenna layout processed by a MIMO algorithm for an optional embodiment of the millimeter-wave radar antenna of the utility model.

[0017] Figure 4 The figure is a Matlab simulation diagram of an optional embodiment of the millimeter wave radar antenna of the utility model. DETAILED DESCRIPTION

[0018] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following illustrative embodiments and descriptions are only used to explain the present invention and are not intended to limit the present invention. In addition, the embodiments and features in the embodiments of the present application may be combined with each other without conflict.

[0019] like Figure 1 As shown, an optional embodiment of the utility model provides a millimeter wave radar antenna, including a dielectric substrate 1, a radar chip 3 arranged on one side surface of the dielectric substrate 1, and a plurality of receiving antennas 5 and a plurality of transmitting antennas 6 respectively connected to the radar chip 3 at their head ends through microstrip lines 4, each receiving antenna 5 and each transmitting antenna 6 are linear array antennas of equal length and arranged on the same side surface of the dielectric substrate 1, each receiving antenna 5 and each transmitting antenna 6 are arranged in parallel on the surface of the dielectric substrate 1, the tail ends of each transmitting antenna 6 are flush with each other, and the tail ends of each receiving antenna 5 are also flush with each other, there are four receiving antennas 5, and the spacing between two adjacent receiving antennas 5 is one wavelength, three wavelengths and two wavelengths respectively.

[0020] In the embodiment of the utility model, four receiving antennas 5 are arranged in parallel and at intervals, and the intervals between two adjacent receiving antennas 5 are one wavelength, three wavelengths and two wavelengths respectively. The four receiving antennas 5 can be virtualized into twelve simulated antennas through a MIMO (multiple-in multiple-out) algorithm. Through specific experimental measurements, it is found that the twelve virtual simulated antennas, in conjunction with the corresponding transmitting antennas 6, can effectively realize the detection of the target, and the angular resolution is also relatively large.

[0021] In an optional embodiment of the present invention, there are three transmitting antennas 6. In this embodiment, three transmitting antennas 6 are used, so that the millimeter wave radar antenna is processed by the MIMO algorithm, the virtual antenna aperture can reach 40, and the angular resolution is high.

[0022] In an optional embodiment of the utility model, the spacing between two adjacent transmitting antennas 6 is thirteen wavelengths and a predetermined optional spacing, and the predetermined optional spacing is two half wavelengths or half a wavelength. In this embodiment, the transmitting antenna 6 is set with the above spacing, and after specific experimental measurements, the angular resolution of the millimeter wave radar antenna can reach 2.86 degrees.

[0023] In an optional embodiment of the utility model, two transmitting antennas 6 with a spacing of thirteen wavelengths are respectively arranged on opposite sides of the area where each transmitting antenna 6 is arranged on the dielectric substrate 1. In this embodiment, the area where each transmitting antenna 6 is arranged is arranged between the two transmitting antennas 6 with thirteen wavelengths, so as to reasonably utilize the spatial layout on the dielectric substrate 1 and reduce the overall occupied space.

[0024] In an optional embodiment of the present invention, the tail end of each receiving antenna 5 protrudes outward by a predetermined length compared to the tail end of each transmitting antenna 6. Since the receiving port and the transmitting port of the radar chip 3 are usually arranged on two adjacent sides, in order to facilitate the arrangement of the microstrip line 4 and reasonably utilize the space layout on the dielectric substrate 1, in this embodiment, the tail end of the receiving antenna 5 protrudes outward by a predetermined length compared to the tail end of each transmitting antenna 6.

[0025] In an optional embodiment of the present invention, Figure 1 As shown, the microstrip lines 4 connecting the receiving antennas 5 are bent and extended on the dielectric substrate 1 to be equal in length; the microstrip lines 4 connecting the transmitting antennas 6 are bent and extended on the dielectric substrate 1 to be equal in length. In this embodiment, the microstrip lines 4 connecting the receiving antennas 5 are bent and extended on the dielectric substrate 1 to be equal in length, so that the phases of the receiving antennas 5 can be equal; and the microstrip lines 4 connecting the transmitting antennas 6 are bent and extended on the dielectric substrate 1 to be equal in length, so that the phases of the transmitting antennas 6 can be equal.

[0026] In an optional embodiment of the present invention, Figure 1 and Figure 2 As shown, the radar chip 3, the multiple receiving antennas 5 and the multiple transmitting antennas 6 are all arranged on the same side surface of the dielectric substrate 1, and the millimeter wave radar antenna also includes a first grounding plate 7 arranged on the surface of the dielectric substrate 1 and provided with hollow holes 70 at positions corresponding to the radar chip 3 and each of the microstrip lines 4, and a predetermined gap 72 is provided between the edges of the hollow holes around the radar chip 3 and both sides of any part of each microstrip line 4. In this embodiment, by adding the first grounding plate 7, and forming the microstrip lines 4 on the inner side of the first grounding plate 7, and also providing the hollow holes 70 and the predetermined gap 72, the electromagnetic waves can be effectively confined to the hollow holes 70 of the first grounding plate 7, reducing losses and avoiding the influence on other external electromagnetic components.

[0027] In an optional embodiment of the present invention, Figure 1 and Figure 2As shown, the millimeter wave radar antenna also includes a second ground plate 8 which is arranged on two opposite sides of the dielectric substrate 1 with respect to the first ground plate 7. The first ground plates 7 on both sides of each microstrip line 4 along the line direction are evenly provided with metal vias 74 which sequentially penetrate the first ground plate 7, the dielectric substrate 1 and the second ground plate 8. A metal column 76 is installed in the metal via 74 to electrically connect the first ground plate 7 and the second ground plate 8. In this embodiment, by providing metal vias 74 on both sides of the line direction of the microstrip line 4 and electrically connecting the first ground plate 7 and the second ground plate 8 through the metal column 76, the grounding of the first ground plate 7 is achieved and the grounding of both sides of the line can be strengthened.

[0028] In an optional embodiment of the present invention, the linear array antenna is a string antenna or a comb antenna. In this embodiment, the string antenna and the comb antenna are both common linear array antennas, which can be applied to the millimeter wave radar antenna of the present invention to realize the transmission and reception of electromagnetic waves.

[0029] In a specific implementation, there are four receiving antennas 5 and three transmitting antennas 6. Figure 3 As shown, the MIMO algorithm is used to perform an equivalent virtual operation on the transmitting antenna 6, where the positions of the equivalent three transmitting antennas 6 are -7, 18 and 23 respectively; the positions of the equivalent twelve receiving antennas are 0, 2, 8, 12, 26, 28, 31, 33, 34, 38, 39 and 43 respectively; then, the sparse position recovery algorithm and the MIMO processing algorithm are used to obtain the position of the receiving antenna after sparse completion, and then the sparsely completed antenna is simulated by Matlab, and the simulation diagram is as shown in FIG. Figure 4 As shown, it can be seen that the aperture of the virtual array element antenna is 40, and the overall angular resolution of the antenna reaches 2.86 degrees.

[0030] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, which all belong to the protection scope of the utility model.

Claims

1. A millimeter wave radar antenna, comprising a dielectric substrate, a radar chip disposed on a side surface of the dielectric substrate, and a plurality of receiving antennas and a plurality of transmitting antennas respectively connected to the radar chip at their head ends through microstrip lines, characterized in that: Each receiving antenna and each transmitting antenna are linear array antennas of equal length and are arranged on the same side surface of the dielectric substrate. Each receiving antenna and each transmitting antenna are arranged in parallel on the surface of the dielectric substrate. The tail ends of each transmitting antenna are flush with each other, and the tail ends of each receiving antenna are also flush with each other. There are four receiving antennas, and the spacing between two adjacent receiving antennas is one wavelength, three wavelengths and two wavelengths respectively.

2. The millimeter wave radar antenna according to claim 1, characterized in that: There are three transmitting antennas.

3. The millimeter wave radar antenna according to claim 2, characterized in that: The spacing between two adjacent transmitting antennas is thirteen wavelengths and a predetermined optional spacing in sequence, and the predetermined optional spacing is two and a half wavelengths or half a wavelength.

4. The millimeter wave radar antenna according to claim 3, characterized in that: The two transmitting antennas with a spacing of thirteen wavelengths are respectively arranged on opposite sides of the area where the transmitting antennas are arranged on the dielectric substrate.

5. The millimeter wave radar antenna according to claim 1, characterized in that: The tail end of each receiving antenna protrudes outward by a predetermined length compared to the tail end of each transmitting antenna.

6. The millimeter wave radar antenna according to claim 1, characterized in that: The microstrip lines connecting the receiving antennas are bent and extended on the dielectric substrate to have the same length; The microstrip lines connecting the transmitting antennas are bent and extended on the dielectric substrate to have the same length.

7. The millimeter wave radar antenna according to claim 1, characterized in that: The radar chip, the multiple receiving antennas and the multiple transmitting antennas are all arranged on the same side surface of the dielectric substrate. The millimeter wave radar antenna also includes a first ground plate arranged on the surface of the dielectric substrate and having hollow holes at positions corresponding to the radar chip and each of the microstrip lines, and a predetermined gap is provided between the edges of the hollow holes around the radar chip and on both sides of any part of each microstrip line.

8. The millimeter wave radar antenna according to claim 7, characterized in that: The millimeter-wave radar antenna also includes a second ground plate which is arranged on two opposite sides of the dielectric substrate with respect to the first ground plate. The first ground plates on both sides of each microstrip line along the line are evenly provided with metal vias which penetrate the first ground plate, the dielectric substrate and the second ground plate in sequence. Metal columns are installed in the metal vias to electrically connect the first ground plate and the second ground plate.

9. The millimeter wave radar antenna according to claim 1, characterized in that: The linear array antenna is a string antenna or a comb antenna.

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