CN219350693U - Millimeter wave multilayer dielectric substrate back cavity wave butterfly antenna - Google Patents
Millimeter wave multilayer dielectric substrate back cavity wave butterfly antenna Download PDFInfo
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- CN219350693U CN219350693U CN202320010856.1U CN202320010856U CN219350693U CN 219350693 U CN219350693 U CN 219350693U CN 202320010856 U CN202320010856 U CN 202320010856U CN 219350693 U CN219350693 U CN 219350693U
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Abstract
The utility model provides a millimeter wave multilayer dielectric substrate back cavity wave butterfly antenna which comprises a multilayer dielectric substrate, a butterfly radiation patch and a differential feed unit. Because the butterfly radiation patch is adopted, the bandwidth can meet the millimeter wave common frequency band. In addition, one surface of the lowest dielectric substrate is a metal surface and is used as a reflecting surface, and meanwhile, a plurality of metal through holes are formed in the multi-layer dielectric substrate and surround the butterfly-shaped radiation patch, so that the multi-layer dielectric substrate can be used as a reflector, a structure similar to a cavity is formed through the surrounding metal through holes, electromagnetic waves of the butterfly-shaped radiation patch can be restrained in the cavity structure, distortion of a pattern of the butterfly-shaped antenna is reduced, the butterfly-shaped antenna is enabled to radiate directionally, and ideal antenna performance is achieved.
Description
Technical Field
The utility model belongs to the technical field of millimeter wave radars, and particularly relates to a millimeter wave multilayer dielectric substrate back cavity wave butterfly antenna.
Background
In millimeter wave frequency band, the common antenna on the medium substrate is mainly in the form of microstrip patch, and has the advantages of simple structure, small processing difficulty, low cost and the like. However, the microstrip patch antenna is a resonant narrowband structure, and is difficult to cover the millimeter wave common frequency band, namely the 76GHz-81GHz frequency band. The common bandwidth increasing mode mainly comprises schemes of increasing the thickness of an antenna carrier plate, increasing dielectric loss and the like, but the methods all encounter problems when being implemented in a millimeter wave frequency band, and the main reason is that when an antenna and a millimeter wave chip are arranged on the same layer, the physical characteristics of the carrier plate are changed, and meanwhile, the problems of mismatching of the chip and a wire and the like are caused.
Therefore, it is desirable to develop an on-board antenna capable of covering the millimeter wave common frequency band.
Disclosure of Invention
The present utility model has been made to solve the above problems, and an object of the present utility model is to provide an on-board antenna capable of covering a millimeter wave common frequency band. The utility model adopts a new antenna design scheme and utilizes the characteristics of the butterfly antenna to design. The butterfly antenna has broadband characteristics, the bandwidth of the butterfly antenna is enough to meet the millimeter wave common frequency band (namely, the frequency band of 76GHz-81 GHz), and the butterfly antenna is a non-frequency-variable antenna, and the directional diagram of the butterfly antenna is not changed along with the frequency change. It should be noted that in order to make the butterfly antenna radiate directionally, a reflecting plate needs to be added below the butterfly antenna, and the utility model uses a dielectric plate as a reflector, and adds a metal surface as a reflecting surface at the lowest layer of the dielectric substrate, while considering
The utility model adopts the following technical scheme:
the utility model provides a millimeter wave multilayer dielectric substrate back cavity wave butterfly antenna, which is characterized by comprising the following components: the multi-layer dielectric substrate is used as a carrier plate and a reflector, and one surface of the lowest-layer dielectric substrate is a metal surface and is used as a reflecting surface; the butterfly-shaped radiation patch is arranged on the other surface of the lowest dielectric substrate and is used for radiating and receiving electromagnetic waves; and the differential feed unit is used for carrying out differential feed on the butterfly-shaped radiation patch, wherein the multilayer dielectric substrate is provided with a plurality of metal through holes, surrounds the butterfly-shaped radiation patch and is used for restraining the electromagnetic waves.
The millimeter wave multilayer dielectric substrate back cavity wave butterfly antenna provided by the utility model can also have the technical characteristics that the plurality of metal via holes are round holes with consistent sizes.
The millimeter wave multilayer dielectric substrate back cavity wave butterfly antenna provided by the utility model can also have the technical characteristics that the butterfly radiation patch comprises: the two trapezoid radiation patches are isosceles trapezoids and have the same size, and the upper bottoms of the two trapezoid radiation patches are opposite to each other to form a butterfly; and two rectangular radiation patches are respectively connected with the bottoms of the two trapezoidal radiation patches, and one trapezoidal radiation patch and one rectangular radiation patch on the same side are used as a radiation patch group.
The millimeter wave multilayer dielectric substrate back cavity wave butterfly antenna provided by the utility model can also have the technical characteristics that the differential feed unit is a one-to-two power divider.
The millimeter wave multilayer dielectric substrate back cavity wave butterfly antenna provided by the utility model can also have the technical characteristics that the differential feed unit comprises two paths of microstrip lines which are respectively connected to two radiation patch groups and used for feeding the corresponding radiation patch groups, wherein one path of the microstrip lines extends longer than the other path, so that 180-degree phase delay is realized.
The millimeter wave multilayer dielectric substrate back cavity wave butterfly antenna provided by the utility model can also have the technical characteristics that the differential feed unit is a second-order 3dB bridge.
The millimeter wave multilayer dielectric substrate back cavity wave butterfly antenna provided by the utility model can also have the technical characteristics that the multilayer dielectric substrate comprises six layers of dielectric substrates, the dielectric substrates on the uppermost surface and the lowermost surface are loose R5515 dielectric plates, and the middle multilayer dielectric substrate is an FR4 board.
The millimeter wave multilayer dielectric substrate back cavity wave butterfly antenna provided by the utility model can also have the technical characteristics that the laminated plate thickness of the multilayer dielectric substrate is 1.5mm, the length is 5mm, and the width is 3mm.
The millimeter wave multilayer dielectric substrate back cavity wave butterfly antenna provided by the utility model can also have the technical characteristics that the millimeter wave multilayer dielectric substrate back cavity wave butterfly antenna works in the millimeter wave common frequency band.
The millimeter wave multilayer dielectric substrate back cavity wave butterfly antenna provided by the utility model can also have the technical characteristics that the millimeter wave common frequency band is 76GHz-81GHz.
The actions and effects of the utility model
The millimeter wave multilayer dielectric substrate back cavity wave butterfly antenna comprises a multilayer dielectric substrate, a butterfly radiation patch and a differential feed unit. Because the butterfly radiation patch is adopted, the bandwidth can meet the millimeter wave common frequency band. In addition, one surface of the lowest dielectric substrate is a metal surface and is used as a reflecting surface, and meanwhile, a plurality of metal through holes are formed in the multi-layer dielectric substrate and surround the butterfly-shaped radiation patch, so that the multi-layer dielectric substrate can be used as a reflector, a structure similar to a cavity is formed through the surrounding metal through holes, electromagnetic waves of the butterfly-shaped radiation patch can be restrained in the cavity structure, distortion of a pattern of the butterfly-shaped antenna is reduced, the butterfly-shaped antenna is enabled to radiate directionally, and ideal antenna performance is achieved.
Drawings
Fig. 1 is a schematic structural diagram of a millimeter wave multi-layer dielectric substrate back cavity wave butterfly antenna in an embodiment of the utility model.
Reference numerals:
a millimeter wave multilayer dielectric substrate back cavity wave butterfly antenna 10; a multi-layer dielectric substrate 20; a lowermost dielectric substrate 21; metallization of the via 211; a butterfly radiating patch 30; a trapezoidal radiation patch 31; a rectangular radiating patch 32; a differential feeding unit 40; a first microstrip line 41; a second microstrip line 42; the curved portion 42a.
Detailed Description
In order to make the technical means, creation characteristics, achievement purposes and effects of the millimeter wave multilayer dielectric substrate back cavity butterfly antenna easy to understand, the millimeter wave multilayer dielectric substrate back cavity butterfly antenna is specifically described below with reference to the embodiments and the accompanying drawings.
< example >
Fig. 1 is a schematic structural diagram of a millimeter wave multi-layer dielectric substrate back cavity wave butterfly antenna in this embodiment.
As shown in fig. 1, the millimeter wave multi-layer dielectric substrate back cavity butterfly antenna 10 (hereinafter referred to as butterfly antenna 10) of the present embodiment operates in the millimeter wave common frequency band 76GHz-81GHz, and includes a multi-layer dielectric substrate 20, a butterfly radiation patch 30, and a differential feed unit 40.
The multilayer dielectric substrate 20 is used as a carrier, and one surface of the lowest dielectric substrate 21 is seen from the perspective shown in fig. 1, and the other surface of the lowest dielectric substrate 21 is a metal surface and is used as a reflecting surface, that is, a reflector by using the dielectric substrate. Other structures of the multi-layered dielectric substrate 20 can be seen in the multi-layered dielectric substrate of the prior art. In this embodiment, the butterfly antenna 10 integrally uses 6 dielectric substrates, wherein the upper and lower surface dielectric substrates use loose R5515 dielectric plates with a thickness of 5mil, the middle 4 layers use FR4 plates as support plates, the laminated plate thickness (i.e. the plate thickness of the multilayer dielectric substrate 20) is 1.5mm, and the overall size of the butterfly antenna 10 is 3mm×5mm×1.5mm.
The butterfly-shaped radiation patch 30 is a radiation structure of an antenna, and is used for radiating electromagnetic waves into the air, and can also be used as receiving electric waves. The butterfly-shaped radiation patch 30 is formed on the surface of the lowermost dielectric substrate 21, i.e., the back cavity of the multilayer dielectric substrate 20. The butterfly-shaped radiation patch 30 is composed of two trapezoid radiation patches 31 which are approximately in an isosceles trapezoid shape and a rectangular radiation patch 32 connected to the side edge of the trapezoid radiation patch 31, and the upper bottoms of the two trapezoid radiation patches 31 are opposite to each other to form a butterfly shape. A distance is left between the upper bottoms of the two trapezoidal radiating patches 31. In this embodiment, the two trapezoidal radiating patches 31 are identical in size, the two rectangular radiating patches 32 are identical in size, and the long sides of the rectangular radiating patches 32 are identical to the bottom lengths of the trapezoidal radiating patches 31.
The differential feeding unit 40 is used for feeding two radiating patches with two ports. In this embodiment, the differential feeding unit 40 is a one-to-two power divider, and includes a first microstrip line 41 and a second microstrip line 42. The first microstrip line 41 is connected to the radiation patch group on the left side in the drawing, and the second microstrip line 42 is connected to the radiation patch group on the right side in the drawing, and is used for feeding the two groups of radiation patches respectively, and the feeding ends are close to the upper bottoms of the trapezoidal radiation patches 31 respectively. The extension length of the curved portion 42a of the second microstrip line 42 is longer than that of the curved portion of the first microstrip line 41, that is, the length of one microstrip line is extended to adjust the phase delay. The two power dividers divide two paths of signals with consistent amplitude and phase, the phase delay is adjusted by 180 degrees by prolonging the length of one path of microstrip line, thus the current directions of the two paths are opposite and the amplitudes are consistent, and the amplitudes of the two paths of differential feed circuits of the power divider are unequal due to larger loss of the microstrip line in the millimeter wave frequency band, but the difference value is smaller.
In addition, as shown in fig. 1, in consideration of the influence of the dielectric substrate on the electromagnetic wave, a plurality of circular metal vias 211 penetrating all dielectric substrate layers are further formed in the multi-layer dielectric substrate 20, and the plurality of metal vias 211 are arranged in a substantially quadrangular shape around the butterfly-shaped radiation patch 30. In this embodiment, the number of the metal vias 211 is 19. By forming the metallized vias 211 to have a cavity-like structure, electromagnetic waves can be confined in the cavity-like structure, reducing distortion of the pattern of the butterfly antenna 10. The butterfly antenna 10 can radiate directionally by the cavity structure and reasonably adjusting the thickness of the dielectric substrate. Meanwhile, the plurality of metal via holes 211 can limit the surface wave from propagating towards the surrounding, and can improve the isolation between two radiation patches.
In this embodiment, the portions not described in detail are known in the art.
Example operation and Effect
The millimeter wave multilayer dielectric substrate back cavity wave butterfly antenna 10 provided according to the present embodiment includes a multilayer dielectric substrate 20, a butterfly radiation patch 30, and a differential feeding unit 40. Because the butterfly radiation patch 30 is adopted, the bandwidth can meet the millimeter wave common frequency band. In addition, one surface of the lowest dielectric substrate 21 is a metal surface and serves as a reflecting surface, and meanwhile, the multi-layer dielectric substrate 20 is provided with a plurality of metal via holes 211 penetrating through all dielectric substrates and surrounds the butterfly-shaped radiation patch 30, so that the multi-layer dielectric substrate 20 can be used as a reflector, and a cavity-like structure can be formed through the surrounding metal via holes 211, electromagnetic waves of the butterfly-shaped radiation patch 30 can be restrained in the cavity-like structure, so that the distortion of a directional diagram of the butterfly-shaped antenna 10 is reduced, and the butterfly-shaped antenna 10 is radiated directionally. Meanwhile, the metallized holes 211 can also limit the surface wave from propagating towards turnover, and the isolation between two radiation patches can be effectively improved.
In the embodiment, the differential feeding unit 40 is a one-to-two power divider, and adjusts the phase delay by 180 ° by extending one microstrip line, so as to realize differential feeding, which has a compact structure and is easy to realize.
In the embodiment, the butterfly-shaped radiating patch 30 includes two radiating patches 31 which are approximately isosceles trapezoids, the sizes of the radiating patches are consistent, the upper bottoms of the trapezoids are opposite to each other to form a butterfly shape, and ideal antenna performance can be realized by combining differential feeding.
The above examples are only for illustrating the specific embodiments of the present utility model, and the present utility model is not limited to the description scope of the above examples.
In the above embodiment, the differential feeding unit 40 is a one-to-two power divider, and in an alternative, the differential feeding structure may be implemented by using a second-order 3dB bridge, and as the differential feeding unit 40, a corresponding technical effect may be achieved.
Claims (10)
1. The utility model provides a millimeter wave multilayer dielectric substrate back of body cavity ripples butterfly antenna which characterized in that includes:
the multi-layer dielectric substrate is used as a carrier plate and a reflector, and one surface of the lowest-layer dielectric substrate is a metal surface and is used as a reflecting surface;
the butterfly-shaped radiation patch is arranged on the other surface of the lowest dielectric substrate and is used for radiating and receiving electromagnetic waves; and
a differential feeding unit for differential feeding the butterfly radiation patch,
the multi-layer dielectric substrate is provided with a plurality of metal through holes which surround the butterfly-shaped radiation patch and are used for restraining the electromagnetic waves.
2. The millimeter wave multi-layer dielectric substrate back cavity wave butterfly antenna of claim 1, wherein:
wherein, a plurality of the metal via holes are round holes with consistent size.
3. The millimeter wave multi-layer dielectric substrate back cavity wave butterfly antenna of claim 1, wherein:
wherein, butterfly radiation paster includes:
the two trapezoid radiation patches are isosceles trapezoids and have the same size, and the upper bottoms of the two trapezoid radiation patches are opposite to each other to form a butterfly; and
two rectangular radiation patches are respectively connected with the lower bottoms of the two trapezoidal radiation patches,
one of the trapezoidal radiating patches and one of the rectangular radiating patches on the same side are used as one radiating patch group.
4. The millimeter wave multi-layer dielectric substrate back cavity wave butterfly antenna of claim 3, wherein:
the differential feed unit is a one-to-two power divider.
5. The millimeter wave multi-layer dielectric substrate back cavity wave butterfly antenna of claim 4, wherein:
wherein the differential feed unit comprises two paths of microstrip lines which are respectively connected to the two radiation patch groups and used for feeding the corresponding radiation patch groups,
one of the two microstrip lines has a longer extension than the other microstrip line, thereby realizing 180 DEG phase delay.
6. The millimeter wave multi-layer dielectric substrate back cavity wave butterfly antenna of claim 3, wherein:
wherein, the differential feed unit is a second-order 3dB bridge.
7. The millimeter wave multi-layer dielectric substrate back cavity wave butterfly antenna of claim 1, wherein:
wherein the multi-layer dielectric substrate comprises six layers of dielectric substrates,
the dielectric substrates at the uppermost surface and the lowermost surface are loose R5515 dielectric plates,
the middle multilayer dielectric substrate is made of FR4 boards.
8. The millimeter wave multi-layer dielectric substrate back cavity wave butterfly antenna of claim 1, wherein:
wherein the laminated board thickness of the multilayer dielectric substrate is 1.5mm, the length is 5mm, and the width is 3mm.
9. The millimeter wave multi-layer dielectric substrate back cavity wave butterfly antenna of claim 8, wherein:
the millimeter wave multilayer dielectric substrate back cavity wave butterfly antenna works in the millimeter wave common frequency band.
10. The millimeter wave multi-layer dielectric substrate back cavity wave butterfly antenna of claim 9, wherein:
wherein the millimeter wave common frequency band is 76GHz-81GHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320010856.1U CN219350693U (en) | 2023-01-04 | 2023-01-04 | Millimeter wave multilayer dielectric substrate back cavity wave butterfly antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320010856.1U CN219350693U (en) | 2023-01-04 | 2023-01-04 | Millimeter wave multilayer dielectric substrate back cavity wave butterfly antenna |
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| Publication Number | Publication Date |
|---|---|
| CN219350693U true CN219350693U (en) | 2023-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320010856.1U Active CN219350693U (en) | 2023-01-04 | 2023-01-04 | Millimeter wave multilayer dielectric substrate back cavity wave butterfly antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219350693U (en) |
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2023
- 2023-01-04 CN CN202320010856.1U patent/CN219350693U/en active Active
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