CN214706247U - Millimeter wave radar antenna - Google Patents
Millimeter wave radar antenna Download PDFInfo
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- CN214706247U CN214706247U CN202121043144.7U CN202121043144U CN214706247U CN 214706247 U CN214706247 U CN 214706247U CN 202121043144 U CN202121043144 U CN 202121043144U CN 214706247 U CN214706247 U CN 214706247U
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- wave radar
- radar antenna
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Abstract
The utility model provides a millimeter wave radar antenna, millimeter wave radar antenna includes: a dielectric substrate; at least one antenna array formed by etching a part of surface copper foil on the dielectric substrate; the radio frequency chip is arranged on the medium substrate; the antenna array is connected with the radio frequency chip through a feeder network; and the shielding cover is fixed on the other part of the surface copper foil of the dielectric substrate and completely covers the radio frequency chip and the bent part of the feeder network. The utility model provides a shield cover can not keep the problem in gap with feeder network direct contact, keep apart feeder network and radio frequency chip and external environment completely, improved the shielding quality, improve uniformity and low vice lamella performance between the antenna array.
Description
Technical Field
The utility model belongs to the technical field of radar antenna, a antenna is related to, especially relate to a millimeter wave radar antenna.
Background
In order to adapt to the complexity of the environment and the road, the vehicle-mounted millimeter wave radar needs to have a large enough aperture and a sufficient number of channels to realize ultrahigh resolution so as to accurately sense pedestrians and surrounding obstacles. Therefore, the feeder network design of the millimeter wave radar antenna is gradually complicated, but the complicated feeder network and the radiation of the radio frequency chip deteriorate the level and amplitude phase consistency of the antenna side lobe, and the performance of the radar system is reduced.
Although the influence and interference of environmental radiation on the working state of the radar antenna are reduced, the conventional vehicle-mounted radar antenna has limited wave absorbing effect and cannot completely absorb the environmental radiation, so that the radiation influence caused by a feeder network and a radio frequency chip cannot be completely shielded.
Therefore, how to provide a millimeter wave radar antenna to solve the defects that the existing wave-absorbing cover has limited wave-absorbing effect, cannot completely absorb the wave, cannot completely shield the radiation influence caused by a feeder line network and a radio frequency chip, and the like, has become a technical problem to be solved urgently by technical staff in the field.
SUMMERY OF THE UTILITY MODEL
In view of the above prior art's shortcoming, the utility model aims to provide a millimeter wave radar antenna for it is limited to solve current absorbing cover wave-absorbing effect, can't accomplish to absorb completely, leads to the unable problem of shielding the radiation influence that feeder network and radio frequency chip brought completely.
In order to achieve the above objects and other related objects, the present invention provides a millimeter wave radar antenna, including: a dielectric substrate; at least one antenna array formed by etching a part of surface copper foil on the dielectric substrate; the radio frequency chip is arranged on the medium substrate; the antenna array is connected with the radio frequency chip through a feeder network; and the shielding cover is fixed on the other part of the surface copper foil of the dielectric substrate and completely covers the radio frequency chip and the bent part of the feeder network.
In an embodiment of the present invention, the height of the shielding case is between 1 and 2 mm.
In an embodiment of the present invention, a layer of copper foil is also laid on the bottom layer of the dielectric substrate.
In an embodiment of the present invention, the antenna array includes N radiation patches and a radiation feeder line connecting the N radiation patches in series.
In an embodiment of the present invention, the size of the N radiation patches decreases gradually from the middle to both ends.
In an embodiment of the present invention, the distance between the N radiation patches is λg/2，λgIs the wavelength in the medium.
In an embodiment of the present invention, the feeder network includes a microstrip line, a microstrip-substrate integrated waveguide switching structure and a substrate integrated waveguide; and grounding holes are punched around the microstrip line and the microstrip-substrate integrated waveguide switching structure to form a grounded coplanar waveguide.
In an embodiment of the present invention, the microstrip-substrate integrated waveguide transition structure gradually widens from the microstrip line, and is connected to the substrate integrated waveguide.
In an embodiment of the present invention, the substrate integrated waveguide is formed by connecting upper and lower surface copper foils through periodic metal through holes at two ends to form a closed structure; the distance between the two rows of metal through holes is lambda/2; where λ is the wavelength in vacuum.
As described above, the utility model discloses a millimeter wave radar antenna has following beneficial effect:
in millimeter wave radar antenna's feeder line network, use microstrip-SIW (substrate integrated waveguide) -microstrip structure, on the shielded enclosure can seamless welding SIW, solved the shielded enclosure can not keep apart the problem of gap with feeder line network direct contact, keep apart feeder line network and radio frequency chip and external environment completely, improved the shielding quality, improve uniformity and low vice lamella performance between the antenna array.
Drawings
Fig. 1 is a schematic plan view of a millimeter wave radar antenna according to an embodiment of the present invention.
Fig. 2 is a schematic plan view of a feeder network according to an embodiment of the present invention.
Fig. 3 shows the directional diagrams of two antenna arrays without the addition of a shield according to the present invention.
Fig. 4 shows the directional diagrams of two antenna arrays with the addition of the shield of the present invention.
Description of the element reference numerals
1 millimeter wave radar antenna
11 dielectric substrate
12 antenna array
13 radio frequency chip
14 feeder network
15 shield cover
111 a part of surface copper foil
112 another part of the surface copper foil
121 radiation patch
122 radiation feed line
141 microstrip line
142 microstrip-substrate integrated waveguide switching structure
143 substrate integrated waveguide
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.
Examples
The utility model provides a millimeter wave radar antenna, include:
a dielectric substrate;
at least one antenna array formed by etching a part of surface copper foil on the dielectric substrate;
the radio frequency chip is arranged on the medium substrate; the antenna array is connected with the radio frequency chip through a feeder network;
and the shielding cover is fixed on the other part of the surface copper foil of the dielectric substrate so as to completely cover the radio frequency chip and the bent part of the feeder network.
The millimeter wave radar antenna provided in the present embodiment will be described in detail below with reference to the drawings. Referring to fig. 1, a schematic plan view of a millimeter wave radar antenna in an embodiment is shown. As shown in fig. 1, the millimeter wave radar antenna 1 includes a dielectric substrate 11, two antenna arrays 12, a radio frequency chip 13, a feeder network 14, and a shielding case 15.
And a complete bottom layer copper foil is laid on the bottom layer of the dielectric substrate 11, and a part of the surface layer copper foil 111 is etched to form two antenna arrays 12.
The antenna array 12 includes N radiation patches 121 and a radiation feed 122 connecting the N radiation patches in series.
In particular, N is between 4 and 16. The distance between the N radiating patches is lambdag/2，λgIs the wavelength in the medium.
In this embodiment, the sizes of the N radiation patches 121 decrease from the middle to both ends. The optimum current distribution is satisfied by the N radiation patches 121 whose sizes decrease from the middle to both ends to secure the low side lobe characteristic.
In this embodiment, the rf chip 13 is disposed on the dielectric substrate 11; the antenna array 12 is connected to the rf chip 13 through a feeder network 14.
Please refer to fig. 2, which is a schematic plan view illustrating a feeder network according to an embodiment. As shown in fig. 2, the feeder network 14 includes a microstrip line 141, a microstrip-substrate integrated waveguide transition structure 142, and a substrate integrated waveguide 143. And grounding holes are formed around the microstrip line 141 and the microstrip-substrate integrated waveguide switching structure 142 to form a grounded coplanar waveguide, so that the loss is reduced.
The microstrip-substrate integrated waveguide transition structure 142 is gradually widened by the microstrip line 141 and is connected with the substrate integrated waveguide.
The substrate integrated waveguide 143 is formed by connecting upper and lower surface copper foils through periodic metal through holes at both ends to form a closed structure. In this embodiment, the substrate integrated waveguide 143 forming a closed structure functions as a waveguide, and the distance between two rows of metal through holes is λ/2; where λ is the wavelength in vacuum. And on the premise of ensuring the main mode transmission, the array layout is convenient.
In practical application, the substrate integrated waveguide 143 can be bent, changed in length and position according to actual arrangement conditions, and is flexible.
In this embodiment, in order to solve the problem that the shielding can cannot directly contact with the feeder network and thus has a gap, the shielding can 15 is fixed on another part of the surface copper foil 112 of the dielectric substrate 11 and completely covers the rf chip 13 and the bent portion of the feeder network 14. In practical applications, the shielding can 15 is soldered on the other portion of the surface copper foil 112.
In this embodiment, since the substrate-integrated waveguide 143 has a waveguide structure with good sealing and transmission performance, the shield case 15 is in direct contact with the substrate-integrated waveguide 143, and thus complete sealing is achieved. In the present embodiment, the height of the shielding cover 15 is as low as possible under the premise that the rf chip 13 can be covered, and preferably, the height of the shielding cover is between 1 and 2 mm. And the shield 15 and the antenna array 12 need a certain distance, so that the shield 15 is prevented from shielding the antenna pattern.
The shielding case 15 completely isolates the radio frequency chip 13 and the feeder network 14 from the external environment, so that the shielding quality is improved, and the consistency and low side lobe performance between antenna arrays are improved.
Referring to fig. 3, the patterns of the two antenna arrays are shown without the addition of a shield. As shown in fig. 3, the pitch side lobe level suppression ratio deteriorates to-16 dB and the two patterns become less consistent, see fig. 4, showing the patterns of the two antenna arrays with the addition of the shield. As shown in fig. 4, in the case of adding the shield case, the pitch direction side lobe level suppression ratio reaches-21 dB, and the consistency between the two directional diagrams is good.
To sum up, in the feeder network of millimeter wave radar antenna, use microstrip-SIW (substrate integrated waveguide) -microstrip structure, on the SIW can be welded to the shield cover seamless, solved the shield cover can not keep apart the problem of gap with feeder network direct contact, keep apart feeder network and radio frequency chip and external environment completely, improved the shielding quality, improve uniformity and the low vice lamella performance between the antenna array. The utility model discloses effectively overcome all kinds of shortcomings in the prior art and had high industry value.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. A millimeter-wave radar antenna, comprising:
a dielectric substrate;
at least one antenna array formed by etching a part of surface copper foil on the dielectric substrate;
the radio frequency chip is arranged on the medium substrate; the antenna array is connected with the radio frequency chip through a feeder network;
and the shielding cover is fixed on the other part of the surface copper foil of the dielectric substrate and completely covers the radio frequency chip and the bent part of the feeder network.
2. The millimeter-wave radar antenna of claim 1, wherein: the height of the shield is between 1 and 2 mm.
3. The millimeter-wave radar antenna of claim 1, wherein: and a layer of copper foil is also laid on the bottom layer of the dielectric substrate.
4. The millimeter-wave radar antenna of claim 1, wherein: the antenna array comprises N radiating patches and a radiating feeder line which connects the N radiating patches in series.
5. The millimeter-wave radar antenna of claim 4, wherein: the sizes of the N radiation patches are decreased from the middle to the two ends.
6. The millimeter wave radar antenna according to claim 4 or 5, characterized in that: the distance between the N radiating patches is lambdag/2，λgIs the wavelength in the medium.
7. The millimeter-wave radar antenna of claim 1, wherein: the feeder network comprises a microstrip line, a microstrip-substrate integrated waveguide switching structure and a substrate integrated waveguide; and grounding holes are punched around the microstrip line and the microstrip-substrate integrated waveguide switching structure to form a grounded coplanar waveguide.
8. The millimeter-wave radar antenna of claim 7, wherein: the microstrip-substrate integrated waveguide switching structure is gradually widened by the microstrip line and is connected with the substrate integrated waveguide.
9. The millimeter-wave radar antenna of claim 7, wherein: the substrate integrated waveguide is formed by connecting upper and lower surface copper foils through periodic metal through holes at two ends to form a closed structure; the distance between the two rows of metal through holes is lambda/2; where λ is the wavelength in vacuum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121043144.7U CN214706247U (en) | 2021-05-14 | 2021-05-14 | Millimeter wave radar antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121043144.7U CN214706247U (en) | 2021-05-14 | 2021-05-14 | Millimeter wave radar antenna |
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| CN214706247U true CN214706247U (en) | 2021-11-12 |
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| CN202121043144.7U Active CN214706247U (en) | 2021-05-14 | 2021-05-14 | Millimeter wave radar antenna |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11901601B2 (en) | 2020-12-18 | 2024-02-13 | Aptiv Technologies Limited | Waveguide with a zigzag for suppressing grating lobes |
| US11949145B2 (en) | 2021-08-03 | 2024-04-02 | Aptiv Technologies AG | Transition formed of LTCC material and having stubs that match input impedances between a single-ended port and differential ports |
| US11962085B2 (en) | 2021-05-13 | 2024-04-16 | Aptiv Technologies AG | Two-part folded waveguide having a sinusoidal shape channel including horn shape radiating slots formed therein which are spaced apart by one-half wavelength |
-
2021
- 2021-05-14 CN CN202121043144.7U patent/CN214706247U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11901601B2 (en) | 2020-12-18 | 2024-02-13 | Aptiv Technologies Limited | Waveguide with a zigzag for suppressing grating lobes |
| US11962085B2 (en) | 2021-05-13 | 2024-04-16 | Aptiv Technologies AG | Two-part folded waveguide having a sinusoidal shape channel including horn shape radiating slots formed therein which are spaced apart by one-half wavelength |
| US11949145B2 (en) | 2021-08-03 | 2024-04-02 | Aptiv Technologies AG | Transition formed of LTCC material and having stubs that match input impedances between a single-ended port and differential ports |
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