CN112635999A

CN112635999A - Antenna device and radar device

Info

Publication number: CN112635999A
Application number: CN202011479475.5A
Authority: CN
Inventors: 谢倩倩; 徐凌; 张慧
Original assignee: Nanjing Hawkeye Electronic Technology Co Ltd
Current assignee: Nanjing Hawkeye Electronic Technology Co Ltd
Priority date: 2020-12-15
Filing date: 2020-12-15
Publication date: 2021-04-09
Anticipated expiration: 2040-12-15
Also published as: CN112635999B

Abstract

The invention discloses an antenna device and a radar device, wherein the antenna device comprises: a dielectric substrate; the gap layer is provided with a plurality of gaps, and the plurality of gaps are distributed on one surface of the medium substrate; the medium substrate is provided with a cavity, the cavity is filled with air, and the gap layer is communicated with the cavity. According to the invention, the cavity etched in the dielectric substrate is used for setting the transmission medium in the cavity as air, so that the loss caused by the transmission medium is reduced, and the gain of the antenna device is improved.

Description

Antenna device and radar device

Technical Field

The present invention relates to the field of antenna technologies, and in particular, to an antenna device and a radar device.

Background

The existing BSD (Blind Spot Detection) radar needs a wide Detection range, and therefore, a directional pattern of an antenna needs a wide beam width. Most of the current antenna forms use microstrip antennas for beam forming to achieve large angle beam coverage, or directly use SIW (Substrate Integrated Waveguide) slot antennas.

Although the detection distance and the beam width of the existing antenna design can meet the requirements of blind area detection, the antenna design is particularly applied to high frequency, and the dielectric loss, the conductor loss and the surface wave loss are large.

Disclosure of Invention

The embodiment of the invention provides an antenna device and a radar device, which effectively solve the problem that the dielectric loss is large when the existing antenna design is applied to high frequency.

According to an aspect of the present invention, an embodiment of the present invention provides an antenna apparatus, including: a dielectric substrate; the slot antenna layer is provided with a plurality of slots, and the slots are distributed on one surface of the dielectric substrate; the medium substrate is provided with a cavity, the cavity is filled with air, and the gap layer is communicated with the cavity.

Further, the size of the cavity is the same as the standard waveguide size.

Further, comprising: the copper-clad layers are arranged in the dielectric substrate and are parallel to the first surface.

Further, the plurality of gaps penetrate through the copper-clad layer and are communicated with the cavity.

Further, the dielectric constant of the dielectric plate is 2.5-3.5, preferably, the dielectric constant is 3.

Further, the distance between two adjacent slits is half of the wavelength of the medium.

Further, the gaps are alternately distributed up and down.

Further, the slits in each row are located at positions corresponding to the spaced positions between the slits in the adjacent rows.

Further, the dielectric substrate comprises a plurality of feed layers, wherein the feed layers are stacked.

According to another aspect of the present invention, an embodiment of the present invention provides a radar apparatus, including the antenna apparatus described above.

According to the antenna device and the radar device provided by the embodiment of the invention, the cavity is etched in the dielectric substrate, and the transmission medium in the cavity is set to be air, so that the loss caused by the transmission medium is reduced, and the gain of the antenna device is improved.

Drawings

The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.

Fig. 1 is a side view of an antenna device according to an embodiment of the present invention.

Fig. 2 is a top view of an antenna device according to an embodiment of the present invention.

Fig. 3 is a side view of an antenna device according to a second embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a radar apparatus according to an embodiment of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. In this embodiment, the analog display screen touch unit is connected to the head tracking unit, and is configured to acquire a moving path of a sensing cursor in the display device.

Fig. 1 and fig. 2 are a side view and a top view of an antenna device structure according to an embodiment of the present invention. The device includes: a dielectric substrate 10, a gap layer 60, and a plurality of copper clad layers 50.

In this embodiment, the dielectric substrate 10 includes three feed layers 30, wherein the three feed layers 30 are stacked, which is beneficial to reduce the loss of the electromagnetic wave on the surface of the entire dielectric substrate, but in other embodiments, the arrangement manner of the feed layers is not limited thereto. Specifically, the feeding layers 30 are connected to each other by a copper-clad layer 50. The dielectric feed layer 30 is made of Rogers 3003 plate material, and has a dielectric constant of 3.0 and a thickness of 0.3 mm. In other embodiments, the dielectric plate has a dielectric constant of 2.5-3.5.

The slit layer 60 has a plurality of slits 40, and the plurality of slits 40 are distributed on a surface of the dielectric substrate 10.

Specifically, the distance between two adjacent slits 40 is half of the wavelength of the medium. The slits 40 are alternately arranged up and down. The slits 40 in each row are located at positions corresponding to the spacing positions between adjacent rows of slits 40. In the present embodiment, the slits 40 are distributed in two rows.

The dielectric substrate 10 is provided with a cavity 20, and the cavity 20 is filled with air. Since air losses are minimal in all transmission media in nature, filling the cavity 20 with air maximizes the energy radiated rather than lost by the media.

The slot layer 60 is in communication with the cavity 20. The cavity 20 is the same size as a standard waveguide. The cavity 20 is generally formed by etching. For example, standard waveguide dimensions in the 60.5GHz-91.9GHz range are 3.1mm width and 1.55mm height of the inner cross-section of the cavity.

The copper-clad layers 50 are disposed in the dielectric substrate 10 and parallel to the first surface. The plurality of slits 40 communicate with the cavity 20 through the copper-clad layer 50.

In actual operation, the slot 10 cuts the current on the metal (e.g. copper) surface of the inner wall of the cavity 20, so that the electromagnetic field in the cavity 20 excites the slot 10, thereby coupling the internal electromagnetic wave into free space. The loss due to the dielectric properties of the antenna is mostly measured by using the loss tangent, the loss tangent of the Rogers 3003 plate is 0.0013, and the loss tangent of air is 0, so that the loss due to the transmission medium can be better reduced by using the air filled in the cavity 20 as the transmission medium.

According to the antenna device provided by the embodiment of the invention, the cavity etched in the dielectric substrate is used for setting the transmission medium in the cavity as air, so that the loss caused by the transmission medium is reduced, and the gain of the antenna device is improved.

Fig. 3 is a side view of an antenna device according to a second embodiment of the present invention. The device includes: a dielectric substrate 10, a gap layer 60, and a plurality of copper clad layers 50.

In this embodiment, the dielectric substrate 10 includes six feed layers 30, where the six feed layers 30 are stacked, which is beneficial to reduce the loss of the electromagnetic wave on the surface of the entire dielectric substrate, but in other embodiments, the arrangement manner of the feed layers is not limited thereto. Specifically, the feeding layers 30 are connected to each other by a copper-clad layer 50. The material of the feed layer 30 is Rogers 3003 plate, the dielectric constant of which is 3.0 and the thickness of which is 0.3 mm. In other embodiments, the dielectric plate has a dielectric constant of 2.5-3.5.

Specifically, the distance between two adjacent slits 40 is equal and half the wavelength of the medium. The slits 40 are alternately arranged up and down. The slits 40 in each row are located at positions corresponding to the spacing positions between adjacent rows of slits 40. In the present embodiment, the slits 40 are distributed in two rows.

In actual operation, the slot 10 cuts the current on the metal (e.g. copper) surface of the inner wall of the cavity 20, so that the electromagnetic field in the cavity 20 excites the slot 10, thereby coupling the internal electromagnetic wave into free space. In addition, further experiments show that when the frequency reaches above 77GHz, the loss caused by the transmission medium can be reduced better by using the air filled in the cavity 20 as the transmission medium.

Referring to fig. 4, an embodiment of the present invention further provides a radar apparatus 1000, where the radar apparatus 1000 includes: the transceiver 200 includes the antenna device 100 according to the above embodiment, and the data transmission device 300 includes the transceiver 200. The radar device can be applied to various vehicles so as to enable the positioning of the vehicles to be more accurate.

The above operations can be implemented in the foregoing embodiments, and are not described in detail herein.

In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.

Claims

1. An antenna device, comprising:

a dielectric substrate;

the gap layer is provided with a plurality of gaps, and the plurality of gaps are distributed on one surface of the medium substrate;

the medium substrate is provided with a cavity, the cavity is filled with air, and the gap layer is communicated with the cavity.

2. The antenna device according to claim 1, characterized in that the cavity has the same dimensions as standard waveguides.

3. The antenna device according to claim 1, comprising:

the copper-clad layers are arranged in the dielectric substrate and are parallel to the first surface.

4. The antenna device of claim 3, wherein the plurality of slots communicate with the cavity through the copper-clad layer.

5. An antenna device according to claim 1, characterized in that the dielectric plate has a dielectric constant of 2.5-3.5, preferably a dielectric constant of 3.

6. The antenna device according to claim 1, characterized in that the distance between two adjacent slots is half the wavelength of the medium.

7. The antenna device according to claim 1, wherein the slots are alternately arranged in an up-down direction.

8. The antenna device according to claim 7, wherein the slots in each row are located at positions corresponding to the spacing between slots in adjacent rows.

9. The antenna device of claim 1, wherein the dielectric substrate comprises a plurality of feed layers, and wherein the plurality of feed layers are stacked.

10. A radar apparatus, characterized in that it comprises an antenna device according to any one of claims 1-9.