CN220753743U - Millimeter wave back cavity patch antenna - Google Patents
Millimeter wave back cavity patch antenna Download PDFInfo
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- CN220753743U CN220753743U CN202322279394.6U CN202322279394U CN220753743U CN 220753743 U CN220753743 U CN 220753743U CN 202322279394 U CN202322279394 U CN 202322279394U CN 220753743 U CN220753743 U CN 220753743U
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Abstract
The utility model provides a millimeter wave back cavity patch antenna, which comprises a dielectric substrate with a back cavity, a metal floor, a supporting medium and a metal patch, wherein the back cavity is filled with air, the cross section area of the back cavity is gradually increased from the bottom to the top of the back cavity, the supporting medium is positioned in the back cavity and on the metal floor, the metal patch covers one side of the supporting medium, which is opposite to the metal floor, the metal floor comprises a metal side wall and a metal bottom wall, the metal side wall is in a curved surface arrangement and covers the side wall of the back cavity, and the metal bottom wall is in a plane arrangement and serves as a floor of a feed transmission line of the antenna. According to the millimeter wave back cavity patch antenna provided by the utility model, the air back cavity arranged by the curved surface is adopted, so that the antenna gain is obviously improved; the antenna structure is shaped, compatibility facing the 3-D printing process is enhanced, and shaping quality of antenna integrated additive manufacturing is improved.
Description
Technical Field
The utility model belongs to the technical field of antennas, and particularly relates to a millimeter wave back cavity patch antenna.
Background
The patch antenna is composed of a dielectric substrate, a metal patch and a metal floor, and has the advantages of small volume, low section, light weight, easy conformal and easy processing. The traditional patch antenna has the defects of narrow bandwidth, low gain, low radiation efficiency and the like. The back cavity patch antenna is an antenna which improves the gain of directional radiation of the antenna by disposing metal cavity walls around the patch on the basis of the structure of the patch antenna. The metal cavity wall of the back cavity inhibits the propagation of unnecessary surface waves along the dielectric substrate, and gathers radiation beams to the opening direction of the back cavity, so that the gain of the antenna can be effectively improved. For a back cavity patch antenna array, the back cavity can reduce coupling between adjacent antenna elements, thereby improving isolation between the antenna elements. The back cavity of the traditional back cavity patch antenna is formed by a metal cavity processed by a computer numerical control milling process or a substrate integrated waveguide cavity processed by processes such as a printed circuit board, low-temperature co-fired ceramic and the like, and the back cavity patch antenna has the defects of structural redundancy, material waste, large assembly error, poor structural flexibility and the like, and cannot optimize the radio frequency performance of the back cavity patch antenna.
In recent years, the 3-D printing technology developed at high speed has become the preferred manufacturing technology of light weight, high speed and integrated integration of millimeter wave antennas, wherein the ink jet is used as a 3-D printing technology suitable for plane or quasi-plane circuits and structures, can print medium parts and metal parts of the circuits synchronously with multiple nozzles and multiple materials, has the advantages of high precision, multiple dimensions and abundant selectable printing materials, and is very suitable for being used as the manufacturing technology of integrated integration of millimeter wave back cavity patch antennas.
Disclosure of Invention
The embodiment of the utility model aims to provide a millimeter wave back cavity patch antenna, which aims to remarkably improve the gain of directional radiation of an antenna unit through the shaping of key structures such as back cavities of the millimeter wave back cavity patch antenna.
In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a millimeter wave back of body chamber patch antenna, including having dielectric substrate, metal floor, supporting medium and the metal paster in back chamber, back chamber is filled by the air, and its cross-sectional area is the increase setting gradually from its bottom to its top, supporting medium is located back chamber's inside just is located on the metal floor, the metal paster cover in supporting medium's dorsad the one side on metal floor, the metal floor includes metal lateral wall and metal diapire, the metal lateral wall is the curved surface setting and covers the lateral wall in back chamber, the metal diapire is the floor of the feed transmission line of plane setting and as the antenna.
Optionally, the profile of the metal sidewall is set in a curve, the center point of the metal patch is taken as an origin, the radial direction of the opening side of the back cavity is taken as an x-axis positive direction, and the normal direction of the metal patch is taken as a z-axis positive direction, so as to establish a plane rectangular coordinate system, and the curve satisfies a function z=a|x| n +b, where a>0，n>0，b<0，0<x 1 ≤|x|≤x 2 ，a、b、n、x 1 And x 2 Are real numbers.
Alternatively, a is more than or equal to 0.03 and less than or equal to 0.06, b is more than or equal to-1.5 and less than or equal to-1, and n is more than or equal to 2 and less than or equal to 4.
Alternatively, a=0.04, n=2, b= -1.12, and x has a value ranging from-5.25 to-1.75 and 1.75 to 5.25.
Optionally, the supporting medium is arranged in a truncated cone shape, so that the cross-sectional area of the supporting medium is gradually reduced from the bottom to the top.
Optionally, the cross section of the support medium and the cross section of the back cavity are both circular.
Optionally, the height of the support medium is equal to the height of the back cavity.
Optionally, the metal bottom wall covers a side of the dielectric substrate facing away from the back cavity, a coupling gap opposite to the metal patch is formed in the metal bottom wall, the millimeter wave back cavity patch antenna further comprises a microstrip line covering the bottom surface of the dielectric substrate, a conduction band of the microstrip line is spaced from the coupling gap and is opposite to the coupling gap, and a floor of the microstrip line is a part of the metal bottom wall.
Optionally, the bottom surface of the dielectric substrate is further provided with a grounded coplanar waveguide, a signal line of the grounded coplanar waveguide is connected with a conduction band of the microstrip line, and a floor of the grounded coplanar waveguide is connected with the metal bottom wall.
Optionally, the millimeter wave back cavity patch antenna is integrally manufactured and formed.
The millimeter wave back cavity patch antenna provided by the utility model has the beneficial effects that: compared with the prior art, the millimeter wave back cavity patch antenna provided by the utility model has the advantages that part of medium in the back cavity is removed, an air back cavity is formed, the metal patch is supported by the supporting medium, the processing cost is reduced, the equivalent dielectric constant of the back cavity medium substrate is reduced, and the impedance bandwidth of the antenna is improved; the back cavity side wall arranged in a curved surface is adopted, a mathematical model is established to optimize the outline of the back cavity side wall, and the gain of the antenna is remarkably improved; the antenna structure is shaped, compatibility facing the 3-D printing process is enhanced, and shaping quality of antenna integrated additive manufacturing is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a first perspective view of a millimeter wave back cavity patch antenna according to an embodiment of the present utility model;
fig. 2 is a second perspective view of a millimeter wave back cavity patch antenna according to an embodiment of the present utility model;
fig. 3 is a cross-sectional view of a millimeter wave back cavity patch antenna provided by an embodiment of the present utility model;
FIG. 4 is a simulated and measured port reflection coefficient curve for the antenna of FIG. 1;
FIG. 5 is a simulated and measured gain curve for the antenna of FIG. 1;
FIG. 6 is a normalized E-plane pattern of simulation and measurement of the antenna of FIG. 1 at 30 GHz;
FIG. 7 is a normalized H-plane pattern of simulation and measurement of the antenna of FIG. 1 at 30 GHz;
FIG. 8 is a simulated and measured normalized E-plane pattern at 33GHz for the antenna of FIG. 1;
FIG. 9 is a normalized H-plane pattern of simulation and measurement of the antenna of FIG. 1 at 33 GHz;
FIG. 10 is a normalized E-plane pattern of simulation and measurement of the antenna of FIG. 1 at 36 GHz;
fig. 11 is a normalized H-plane pattern of simulation and measurement of the antenna of fig. 1 at 36 GHz.
Wherein, each reference sign in the figure:
1-a dielectric substrate; 11-back cavity; 2-a support medium; 3-metal floor; 31-metal sidewalls; 311-coupling slit; 32-a metal bottom wall; 4-a metal patch; 5-microstrip lines; 6-grounded coplanar waveguide.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The millimeter wave back cavity patch antenna provided by the embodiment of the utility model is now described.
Referring to fig. 1 to 3, fig. 1 is a first perspective view of a millimeter wave back cavity patch antenna according to an embodiment of the present utility model, fig. 2 is a second perspective view of a millimeter wave back cavity patch antenna according to an embodiment of the present utility model, and fig. 3 is a cross-sectional view of a millimeter wave back cavity patch antenna according to an embodiment of the present utility model. The millimeter wave back cavity patch antenna comprises a dielectric substrate 1, a metal floor 3, a supporting medium 2 and a metal patch 4. The dielectric substrate 1 has a top surface and a bottom surface which are oppositely arranged, and referring to fig. 1, a back cavity 11 is formed at the top surface of the dielectric substrate 1, and the back cavity 11 is filled with air. The metal floor 3 covers the inner wall of the back cavity 11. The support medium 2 is arranged inside the back chamber 11 and the support medium 2 is located on the metal floor 3. The metal patch 4 covers the side of the support medium 2 facing away from the metal floor 3, i.e. the metal patch 4 covers the top surface of the support medium 2. When the antenna is in operation, the metal patch 4 needs to be fed. The air medium is arranged between the supporting medium 2 and the side wall of the back cavity 11, which is equivalent to "digging" part of the original solid medium of the medium substrate 1 to form the air back cavity 11 and the supporting medium 2, so that the processing cost of the antenna can be reduced by arranging the air back cavity 11, and the equivalent dielectric constant of the medium substrate 1 where the back cavity 11 is positioned is reduced, thereby being beneficial to improving the impedance bandwidth of the antenna. By providing a suitable antenna feed structure, the antenna can be arranged at oxTM exciting the metal patch 4 in the direction 11 And the mode is utilized to effectively improve the bandwidth of the antenna. In addition, the back cavity 11 suppresses propagation of surface waves on the metal floor 3, and concentrates the radiation beam of the antenna to +oz direction, thereby effectively improving the gain of the antenna.
The metal floor 3 includes a metal side wall 31 and a metal bottom wall 32, the metal side wall 31 covers the side wall of the back cavity 11, the metal side wall 31 is curved, that is, the side wall of the back cavity 11 is curved, and the cross-sectional area of the back cavity 11 is gradually increased from the bottom to the top, so that the gain of the antenna is improved. The metal bottom wall 32 is provided in a plane, and the metal bottom wall 32 serves as a floor of a feed transmission line of the antenna.
In the millimeter wave back cavity patch antenna in the embodiment, part of the medium in the back cavity 11 is removed, an air back cavity 11 is formed, and the metal patch 4 is supported by the supporting medium 2, so that the processing cost of the antenna is reduced, and the equivalent dielectric constant of the dielectric substrate 1 where the back cavity 11 is positioned is reduced, thereby being beneficial to improving the impedance bandwidth of the antenna; the side wall of the back cavity 11 is arranged in a curved surface, a mathematical model is established to optimize the outline of the side wall of the back cavity 11, and the gain of the antenna is obviously improved; the antenna structure is shaped, compatibility facing the 3-D printing process is enhanced, and shaping quality of antenna integrated additive manufacturing is improved.
In the millimeter wave back cavity 11 patch antenna in the above embodiment, the direction from the bottom to the top of the back cavity 11 is +oz direction, the oz direction is perpendicular to the bottom wall of the back cavity 11, and the ox direction and the oy direction are parallel to the bottom wall of the back cavity 11.
In one embodiment of the present utility model, referring to fig. 3, the side profile of the metal sidewall 31 is curved, and the side profile of the metal sidewall 31 is parallel to the plane xoz. On the side section shown in fig. 3, the open side of the back cavity 11 is the top side of the back cavity 11, a rectangular coordinate system is established with the center point of the metal patch 4 as the origin, the radial direction of the open side of the back cavity 11 as the positive x-axis direction, the normal direction of the metal patch 4, i.e., the direction from the bottom of the back cavity 11 to the open side as the positive z-axis direction, the curves are provided on the left and right sides of the z-axis, and the xoz plane is provided withBoth curves satisfy the function z=a|x| n +b, where a>0，n>0，b<0，0<x 1 ≤|x|≤x 2 ，a、b、n、x 1 And x 2 Are real numbers. a relates to the aperture size of the opening side of the back chamber 11, and the smaller a is, the larger the aperture of the back chamber 11 is. b is related to the depth of the back chamber 11, the greater the |b| the greater the distance of the bottom point of the back chamber 11 from the origin. n is related to the degree of inclination of the side walls of the back chamber 11, the greater n, the greater the angle of the side walls of the back chamber 11 with the metal bottom wall 32, i.e. the steeper the side walls of the back chamber 11. When n is too small, such as n=0, the sidewalls of the back cavity 11 degrade to be parallel to the xoy plane, i.e., there is no back cavity 11; when n is too large, the number of the n-type wires is too large, for example, when n.fwdarw. +.infinity, the angle between the side wall of the back cavity 11 and the metal bottom wall 32 approaches 90 degrees, i.e. the back chamber 11 has vertical side walls as in conventional designs. X is x 1 And x 2 The starting and ending positions of the abscissa of the function curve are determined. In practical applications, since the supporting medium 2 is present under the metal patch 4, the supporting medium 2 needs to be reserved for a length x 1 Is a circular space of radius, therefore, the function z=a|x| n The starting position of the abscissa of +b is the x-axis coordinate corresponding to the intersection of the side wall profile with the outer circle of the bottom surface of the support medium 2, i.e. x=x 1 The ending position of the abscissa is the x-axis coordinate corresponding to the sidewall profile when it reaches the top of the dielectric substrate 1, i.e. x=x 2 And satisfy 0<x 1 ≤|x|≤x 2 。
Alternatively, a is more than or equal to 0.03 and less than or equal to 0.06, b is more than or equal to-1.5 and less than or equal to-1, and n is more than or equal to 2 and less than or equal to 4. When a <0.03, the increasing speed of the antenna gain is obviously slowed down as the aperture of the opening side of the back cavity 11 is increased, and the value range of a is set to be 0.03-0.06 considering that the increase of the aperture increases the processing cost of the antenna.
In one embodiment of the present utility model, referring to fig. 1 to 3, the metal bottom wall 32 covers a side of the dielectric substrate 1 facing away from the back cavity 11, and the metal bottom wall 32 extends to the edge of the dielectric substrate 1 along the bottom wall of the dielectric substrate 1, wherein the metal bottom wall 32 and the metal side wall 31 are connected and conducted with each other.
The metal bottom wall 32 is provided with a coupling gap 311 which is opposite to the metal patch 4, the bottom surface of the dielectric substrate 1 is provided with a microstrip line 5, the conduction band of the microstrip line 5 is spaced from the coupling gap 311 and opposite to the coupling gap 311, and the floor of the microstrip line 5 is a part of the metal bottom wall 32. That is, the conduction band of the microstrip line 5 and the metal patch 4 are respectively disposed at opposite sides of the coupling slot 311, and the metal patch 4 can be fed from the coupling slot 311 through the microstrip line 5 to form a slot coupling feed antenna. Compared with a feed structure adopting a probe to be in direct contact, the slot-coupled feed structure can provide a larger antenna bandwidth, and the structural design is more flexible.
For a slot-coupled fed antenna, the spacing of the coupling slot 311 from the metal patch 4 determines the actual depth of the back cavity 11, and the depth of the back cavity 11, the size of the coupling slot 311, and the size of the microstrip line 5 together affect the bandwidth of the antenna and the in-band impedance matching. When the coupling gap 311 is set to be 2 mm long and 0.2 mm wide, the value range of b is set to be-1.5-b-1, and the coupling gap 311 and the 50 ohm microstrip line 5 can be matched, so that the antenna performance with good broadband and in-band impedance matching can be obtained.
When n <2, the included angle between the side wall of the back cavity 11 and the metal bottom wall 32 is too small, and the gain of the antenna cannot be maximized; when n >4, the difference between the maximum value and the minimum value of the gain of the antenna in the band is increased sharply, namely the gain flatness is poor, and the value range of n is set to be 2-n-4 by comprehensively considering the factors.
Alternatively, a=0.04, n=2, b= -1.12, and x has a value ranging from-5.25 to-1.75 and 1.75 to 5.25.
In one embodiment of the utility model, the height of the support medium 2 and the height of the back chamber 11 are equal. For example, the height of the support medium 2 may be (1±0.1) mm, such as 0.9 mm, 1 mm, etc., and the height of the support medium 2 and the height of the back chamber 11 are equal.
In one embodiment of the present utility model, referring to fig. 1, the supporting medium 2 is in a shape of a truncated cone, the cross section of the supporting medium 2 is circular, and the cross section area of the supporting medium 2 is gradually reduced from the bottom to the top. By this arrangement, the supporting medium 2 can be formed with higher quality in the 3-D printing process. The back chamber 11 is also circular in cross section. The combination of the circular back cavity and the circular patch can obtain the maximum antenna bandwidth and the highest antenna peak gain in the four combinations of the circular back cavity, the rectangular back cavity, the circular patch and the rectangular patch. During the physical modeling process, the sidewall surface of the back cavity 11 can be obtained by rotating the above-mentioned function curve 180 degrees around the oz axis.
In one embodiment of the present utility model, the bottom surface of the dielectric substrate 1 is further provided with a grounded coplanar waveguide 6, the floor of the grounded coplanar waveguide 6 is connected and conducted with the metal bottom wall 32, and the signal line of the grounded coplanar waveguide 6 is connected and conducted with the conduction band of the microstrip line 5. The grounded coplanar waveguide 6 is connected with a coaxial connector for radio frequency measurement of the millimeter wave back cavity patch antenna.
In one embodiment of the present utility model, the millimeter wave back cavity patch antenna is integrally manufactured and formed, that is, the structures of the dielectric substrate 1, the metal floor 3, the supporting medium 2, the microstrip line 5, and the like are integrally manufactured and formed. The antenna can be manufactured and molded integrally by adopting a 3-D printing process, and under the process, the back cavity 11 of the antenna and the shape of the metal patch 4 along the xoy plane can be flexibly designed, so the antenna is not limited.
Referring to fig. 4 to 11, fig. 4 is a port reflection coefficient curve of the simulation and measurement of the antenna of fig. 1, fig. 5 is a gain curve of the simulation and measurement of the antenna of fig. 1, fig. 6 is a normalized E-plane pattern of the simulation and measurement of the antenna of fig. 1 at 30GHz, fig. 7 is a normalized H-plane pattern of the simulation and measurement of the antenna of fig. 1 at 30GHz, fig. 8 is a normalized E-plane pattern of the simulation and measurement of the antenna of fig. 1 at 33GHz, fig. 9 is a normalized E-plane pattern of the simulation and measurement of the antenna of fig. 1 at 33GHz, fig. 10 is a normalized E-plane pattern of the simulation and measurement of the antenna of fig. 1 at 36GHz, and fig. 11 is a normalized H-plane pattern of the simulation and measurement of the antenna of fig. 1 at 36 GHz. In order to experimentally verify the radio frequency performance of the millimeter wave back cavity patch antenna provided by the embodiment of the utility model, the antenna integrated additive manufacturing and forming in the figure 1 is carried out by adopting a high-precision multi-nozzle ink-jet 3-D printing process, wherein the medium part of the antenna is printed by photosensitive resin 3-DAnd (3) printing and forming, wherein the metal part of the antenna is formed by 3-D printing of nano silver paste. The main dimensions of the antenna design in fig. 1 are as follows: the length of the dielectric substrate 1 is 12 mm, the width is 12 mm, and the height is 1.16 mm; the diameter of the bottom surface of the supporting medium 2 is 3.5 mm, the diameter of the top surface is 2.9 mm, and the height is 1.01 mm; the metal bottom wall 32 is 12 mm long, 12 mm wide and 0.01 mm high; the profile curve of the metal sidewall 31 corresponds to a function z=0.04 x 2 -1.12; the coupling slit 311 is 2 mm long and 0.2 mm wide; the maximum diameter of the back cavity 11 is 10.6 mm; the diameter of the metal patch 4 is 2.5 mm; the distance between the conduction band of the microstrip line 5 and the metal bottom wall 32 is 0.14 mm; the length of the conduction band of the microstrip line 5 is 4.16 mm, and the width is 0.36 mm; the gap/signal line/gap (G/S/G) width of the 50 ohm grounded coplanar waveguide 6 is 530/360/530 microns.
As can be seen from fig. 4 to 11, the simulation and measurement results of this antenna agree well. The frequency range of the simulated-10-dB impedance bandwidth of the antenna is 28.7-37.4GHz, the simulated relative bandwidth is 26.3%, and the simulated in-band gain is 6.1-9.8dBi; the frequency range of the impedance bandwidth of-10-dB measured by the antenna is 28.5-39.8GHz, the measured relative bandwidth is 33%, and the measured in-band gain is 5.9-8.7dBi; the measured E-plane cross polarization is below-25 dB and the measured H-plane cross polarization is below-20 dB. The differences between the simulation and measurement results are mainly caused by the processing errors of the antenna, the radio frequency loss of the coaxial connector and the cable, and the measurement errors in the millimeter wave darkroom.
In the embodiment provided by the utility model, it should be understood that, first, how to design and realize the physical structure of the millimeter wave back cavity patch antenna with high compatibility with the 3-D printing process according to the 3-D printing process principle, realize the integrated manufacturing and forming of the type of antenna and simultaneously realize the maximization of the antenna gain is the core technical problem solved by the utility model; secondly, the air back cavity 11 and the supporting medium 2 are formed by 'digging out' part of the medium substrate 1, and instead of carrying out mechanical or manual 'digging out' of the medium blocks after the whole medium substrate 1 is printed out in a 3-D way, the structure of the air back cavity 11 is designed and modeled in advance to form a processing model in FIG. 1, and then the 3-D printing process is used for integrating additive manufacturing and molding; thirdly, the structure of the back cavity 11 and the size thereof are only schematic, not only a better and realizable structure, but also the size and shape of the back cavity 11 can be adjusted according to actual conditions; fourth, the structure of the feed transmission line of the antenna and its dimensions are merely illustrative, not exclusive, and merely a structure that facilitates implementation and measurement; fifth, millimeter wave back cavity patch antennas and arrays with various polarization modes can be designed and realized based on the antenna unit in an expanding manner, and the antenna structure can be scaled and applied to other millimeter wave frequency bands; sixth, the design concept of fusing the 3-D printing process principle is also applicable to other microwave millimeter wave plane transmission line structures and devices. In the description of the embodiments of the present utility model, given the dimensions of the structures as preferred parameters, the dimensions of the various components may be modified to further achieve the actual desired performance with reference to one of the embodiments of the present utility model.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (10)
1. A millimeter wave back cavity patch antenna, characterized by: including having the dielectric substrate of back of body chamber, metal floor, supporting medium and metal paster, the back of body chamber is filled by the air, and its cross-sectional area is the increase gradually setting from its bottom to its top, supporting medium is located the inside of back of body chamber just is located on the metal floor, the metal paster cover in supporting medium's one side of back of body metal floor, the metal floor includes metal lateral wall and metal diapire, the metal lateral wall is the curved surface setting and covers the lateral wall of back of body chamber, the metal diapire is the floor of plane setting and the feed transmission line as the antenna.
2. The millimeter wave back cavity patch antenna of claim 1, wherein: the side section outline of the metal side wall is arranged in a curve, and the center point of the metal patch is taken as the original pointA point, a plane rectangular coordinate system is established by taking the radial direction of the opening side of the back cavity as the positive direction of the x axis and the normal direction of the metal patch as the positive direction of the z axis, and the curve satisfies the function z=a|x| n +b, where a>0，n>0，b<0，0<x 1 ≤|x|≤x 2 ，a、b、n、x 1 And x 2 Are real numbers.
3. The millimeter wave back cavity patch antenna of claim 2, wherein: a is more than or equal to 0.03 and less than or equal to 0.06, b is more than or equal to-1.5 and less than or equal to-1, and n is more than or equal to 2 and less than or equal to 4.
4. The millimeter wave back cavity patch antenna of claim 3, wherein: a=0.04, n=2, b= -1.12, x is within the range of-5.25 x-1.75 and 1.75 x-5.25.
5. The millimeter wave back cavity patch antenna of claim 1, wherein: the supporting medium is arranged in a truncated cone shape, so that the cross section area of the supporting medium is gradually reduced from the bottom to the top.
6. The millimeter wave back cavity patch antenna of claim 5, wherein: the cross section of the supporting medium and the cross section of the back cavity are both circular.
7. The millimeter wave back cavity patch antenna of claim 1, wherein: the height of the supporting medium is equal to the height of the back cavity.
8. The millimeter wave back cavity patch antenna of any of claims 1-7, wherein: the metal bottom wall covers one side of the dielectric substrate, which is opposite to the back cavity, a coupling gap opposite to the metal patch is formed in the metal bottom wall, the millimeter wave back cavity patch antenna further comprises a microstrip line which covers the bottom surface of the dielectric substrate, a conduction band of the microstrip line is spaced from the coupling gap and is opposite to the coupling gap, and a floor of the microstrip line is a part of the metal bottom wall.
9. The millimeter wave back cavity patch antenna of claim 8, wherein: the bottom surface of the dielectric substrate is also provided with a grounded coplanar waveguide, a signal line of the grounded coplanar waveguide is connected with a conduction band of the microstrip line, and a floor of the grounded coplanar waveguide is connected with the metal bottom wall.
10. The millimeter wave back cavity patch antenna of any of claims 1-7, wherein: the millimeter wave back cavity patch antenna is integrally manufactured and formed.
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| CN202322279394.6U CN220753743U (en) | 2023-08-23 | 2023-08-23 | Millimeter wave back cavity patch antenna |
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| CN202322279394.6U CN220753743U (en) | 2023-08-23 | 2023-08-23 | Millimeter wave back cavity patch antenna |
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| CN (1) | CN220753743U (en) |
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2023
- 2023-08-23 CN CN202322279394.6U patent/CN220753743U/en active Active
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