CN210074169U - Rectangular microstrip series-fed antenna based on grounded coplanar waveguide - Google Patents
Rectangular microstrip series-fed antenna based on grounded coplanar waveguide Download PDFInfo
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- CN210074169U CN210074169U CN201822085089.2U CN201822085089U CN210074169U CN 210074169 U CN210074169 U CN 210074169U CN 201822085089 U CN201822085089 U CN 201822085089U CN 210074169 U CN210074169 U CN 210074169U
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Abstract
The utility model discloses a rectangular microstrip series-fed antenna based on grounded coplanar waveguide, which comprises a transmitting antenna, wherein the transmitting antenna comprises a first medium substrate (1), a first metal floor (2), a first metal patch and a first short-circuit part (6 b); the antenna further comprises a receiving antenna, wherein the receiving antenna comprises a second dielectric substrate (7), a second metal floor (8), a second metal patch, a second short-circuit part (12b), a pad (11) and a coaxial feed port (13). The utility model discloses an antenna is presented to rectangle microstrip cluster based on ground connection coplanar waveguide has characteristics such as gain height, directional diagram are stable, the section is low, light in weight and processing are simple.
Description
Technical Field
The invention belongs to the field of microwave communication, and particularly relates to a rectangular microstrip series-fed antenna based on a grounded coplanar waveguide.
Background
The microstrip antenna has the advantages of low cost, light weight, low profile, small volume, diversified electrical properties, simple manufacture and the like, and is widely applied. The microstrip linear array usually feeds each radiating element by a feed network formed by microstrip lines, which not only can improve the antenna gain, but also can realize specific current distribution on the array through a beam forming technology to obtain a desired antenna directional diagram and improve the directivity of the antenna. However, the increase of the array element can not increase the gain by a corresponding multiple, and a part of the loss is caused by the lengthening of the feeder line. The feed network of the series-fed array is simple and compact, so the loss is small, and the area array can be conveniently and effectively formed by using the series-fed array.
High frequency circuit designers typically consider circuit performance variations, physical size, and power levels when selecting the optimal PCB material for a circuit design. The choice of different transmission line technologies, such as microstrip lines or grounded coplanar waveguides (GCPW), can affect the final performance of the circuit design. In a grounded coplanar waveguide, a small spacing between the top ground conductor and the signal conductor can achieve a low impedance of the circuit, and the impedance of the circuit can be changed by adjusting the spacing. The spacing between the ground and signal conductors increases and the impedance also increases. As the spacing between the top ground and signal conductors of a grounded coplanar waveguide increases, the impact of the ground conductor on the circuit decreases. When the pitch is large enough, the grounded coplanar waveguide circuit is similar to a microstrip line circuit. Although microstrip lines have high radiation loss in the high-frequency band and the millimeter-wave band and it is difficult to realize high-order mode suppression, microstrip lines are still applicable to circuits having a relatively narrow bandwidth in the microwave band. And the microstrip line circuit is less sensitive to the PCB processing technology and the thickness and thickness difference of the copper layer. In contrast, grounded coplanar waveguides have relatively low radiation loss in the millimeter-wave band and can achieve good high-order mode suppression, making grounded coplanar waveguides a suitable candidate for high-frequency transmission line technology. In addition, the requirement of the grounding coplanar waveguide circuit on the PCB processing technology and deviation is not very strict, so that the grounding coplanar waveguide is suitable for mass production and application of high-frequency bands.
Disclosure of Invention
The present invention aims to solve the above problems and provide a rectangular microstrip series-fed antenna based on a grounded coplanar waveguide, which adds a grounded coplanar waveguide to a series-fed antenna array to make the antenna have stable grounding characteristics, thereby realizing low radiation loss and good high-order mode suppression.
The invention realizes the purpose through the following technical scheme:
a rectangular microstrip series-fed antenna based on a grounded coplanar waveguide comprises a transmitting antenna, wherein the transmitting antenna comprises a first dielectric substrate, a first metal floor, a first metal patch and a first short-circuit part;
the first metal patch and the first metal floor are respectively arranged on two surfaces of the first medium substrate;
the first metal patch comprises a transmission line of a wave port, a first patch array, a first grounding patch of the coplanar waveguide and a first central signal line of the coplanar waveguide;
the first patch array comprises a plurality of first rectangular patches which are fed in series;
the transmission line is connected with one end of the first patch array;
the adjacent first rectangular patches are connected through the first central signal line;
the first grounding patches are arranged on two sides of the first central signal line;
the first shorting member penetrates the first dielectric substrate and connects the first ground patch and the first metal ground.
Furthermore, the antenna also comprises a receiving antenna, wherein the receiving antenna comprises a second dielectric substrate, a second metal floor, a second metal patch, a second short-circuit part, a bonding pad and a coaxial feed port;
the second metal patch and the second metal floor are respectively arranged on two surfaces of the second medium substrate;
the second metal patch comprises a second patch array, a second grounding patch of the coplanar waveguide and a second central signal line of the coplanar waveguide;
the second patch array comprises a plurality of second rectangular patches which are fed in series;
the bonding pad is connected with one end of the second patch array;
the adjacent second rectangular patches are connected through the second central signal line;
the second grounding patches are arranged on two sides of the second central signal line;
the second short circuit part penetrates through the dielectric substrate and is connected with the second grounding patch and the second metal floor;
the coaxial feed port penetrates through the dielectric substrate and is connected with the bonding pad.
Wherein, the receiving antenna is inputted by the signal of the coaxial feeding port.
Furthermore, the widths of the first rectangular patches are the same, the length ratio of the adjacent first rectangular patches is a fixed value, and the lengths of the first rectangular patches are gradually reduced from the connecting end of the first patch array and the transmission line to the other end.
Furthermore, the widths of the second rectangular patches are the same, the length ratio of the adjacent second rectangular patches is a fixed value, and the lengths of the first rectangular patches are gradually reduced from the connecting ends of the second patch array and the bonding pad to the other ends of the second patch array and the bonding pad.
Further, the length and the width of the first central signal line between adjacent first rectangular patches are the same.
Further, the length and the width of the second central signal line between adjacent second rectangular patches are the same.
Still further, the antenna further comprises a first impedance transformation line, and the first impedance transformation line is arranged between the transmission line and the first patch array.
Still further, the patch further comprises a second impedance transformation line, and the second impedance transformation line is arranged between the pad and the second patch array.
The first rectangular patches of the second patch array of the transmitting antenna are divided into four groups in total, wherein the group at the middle has an impedance transformation line besides a microstrip connecting line.
The second rectangular patches of the second patch array of the receiving antenna are divided into four groups in total, wherein the group at the middle has a second impedance transformation line besides a section of microstrip connecting line.
Furthermore, the number of the first patch array and the second patch array is two. Wherein two of the first patch arrays are at an angle of 180 °. Two of the second patch arrays are at a 180 ° angle.
Furthermore, each first grounding patch is connected with two first short-circuit parts, and each second grounding patch is connected with two second short-circuit parts. The first grounding patches of the coplanar waveguide of the transmitting antenna are 12 in total, and the first short-circuit parts are symmetrically loaded on the first grounding patches of the coplanar waveguide by taking two as a group. Wherein the first ground patch is rectangular. Thereby achieving relatively low radiation losses and good high-order mode suppression.
The number of the second grounding patches of the coplanar waveguide of the receiving antenna is 12, and the two short-circuit components are symmetrically loaded on the second grounding patches of the coplanar waveguide. Wherein the second ground patch is rectangular. Thereby achieving relatively low radiation losses and good high-order mode suppression.
Has the advantages that: the rectangular microstrip series-fed antenna based on the grounded coplanar waveguide has the characteristics of low profile, low cost and simple manufacture, and has a firm grounded structure, relatively low radiation loss and good high-order mode suppression.
Drawings
FIG. 1 is a perspective view of a rectangular microstrip series-fed transmitting antenna based on a grounded coplanar waveguide according to the present invention;
FIG. 2 is a top view of a rectangular microstrip series-fed transmitting antenna based on a grounded coplanar waveguide according to the present invention;
FIG. 3 is a perspective view of a rectangular microstrip series-fed receiving antenna based on a grounded coplanar waveguide according to the present invention;
FIG. 4 is a top view of a rectangular microstrip series-fed receiving antenna based on a grounded coplanar waveguide according to the present invention;
FIG. 5 is a side view of a rectangular microstrip series-fed receiving antenna based on a grounded coplanar waveguide taken along the section A-A' of the present invention;
FIG. 6 shows the input end reflection coefficient of the rectangular microstrip series-fed transmitting antenna based on the grounded coplanar waveguide according to the present invention;
FIG. 7 is a radiation pattern of a rectangular microstrip series-fed transmitting antenna based on a grounded coplanar waveguide according to the present invention;
FIG. 8 shows the input reflection coefficient of the rectangular microstrip series-fed receiving antenna based on the grounded coplanar waveguide according to the present invention;
fig. 9 is the radiation pattern of the rectangular microstrip series-fed receiving antenna based on the grounded coplanar waveguide of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the accompanying drawings as follows:
referring to fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, the rectangular microstrip series-fed antenna based on the grounded coplanar waveguide of the present invention includes a transmitting antenna, wherein the transmitting antenna includes a first dielectric substrate 1, a first metal floor 2, a first metal patch and a first short-circuit part 6 b; the first metal patch and the first metal floor 2 are respectively arranged on two surfaces of the first medium substrate 1; the first metal patch comprises a transmission line 3 of a wave port, a first patch array, a first grounding patch 6a of a coplanar waveguide and a first central signal line 6c of the coplanar waveguide; the first patch array comprises a plurality of first rectangular patches 4a,4b,4c,4d fed in series; the transmission line 3 is connected with one end of the first patch array; the adjacent first rectangular patches 4a,4b,4c and 4d are connected through a first central signal line 6 c; both sides of the first central signal line 6c are provided with first ground patches 6 a; the first short-circuit part 6b penetrates the first dielectric substrate 1 and connects the first ground patch 6a and the first metal ground plate 2.
Preferably, the widths of the first rectangular patches 4a,4b,4c,4d are all the same, the length ratio of the adjacent first rectangular patches 4a,4b,4c,4d is a fixed value, and the lengths of the first rectangular patches 4a,4b,4c,4d gradually decrease from the connection end of the first patch array and the transmission line 3 to the other end.
Preferably, the length and width of the first central signal line 6c between adjacent first rectangular patches 4a,4b,4c,4d are the same.
Preferably, a first impedance transformation line 5a is further included, the first impedance transformation line 5a being disposed between the transmission line 3 and the first patch array.
Preferably, two first short-circuit members 6b are connected to each first ground patch 6 a. The number of the first grounding patches 6a of the coplanar waveguide of the transmitting antenna is 12, and the first short-circuit parts 6b are symmetrically loaded on the first grounding patches 6a of the coplanar waveguide by taking two as a group. Wherein the first ground patch 6a is rectangular.
Preferably, the antenna further comprises a receiving antenna, wherein the receiving antenna comprises a second dielectric substrate 7, a second metal floor 8, a second metal patch, a second short-circuit part 12b, a pad 11 and a coaxial feed port 13; the second metal patch and the second metal floor 8 are respectively arranged on two surfaces of the second medium substrate 7; the second metal patch comprises a second patch array, a second ground patch 12a of the coplanar waveguide and a second central signal line 12c of the coplanar waveguide; the second patch array comprises a plurality of second rectangular patches 9a,9b,9c,9d fed in series; the pad 11 is connected with one end of the second patch array; the adjacent second rectangular patches 9a,9b,9c and 9d are connected through a second central signal line 12 c; second ground patches 12a are arranged on two sides of the second central signal line 12 c; the second short-circuit part 12b penetrates the second dielectric substrate 7 and connects the second ground patch 12a and the second metal ground plate 8; the coaxial feed port 13 penetrates the second dielectric substrate 7 and connects to the pad 11.
Wherein the receiving antenna is signal-inputted through the coaxial feeding port 13.
Preferably, the widths of the second rectangular patches 9a,9b,9c,9d are all the same, the length ratio of adjacent second rectangular patches 9a,9b,9c,9d is a fixed value, and the lengths of the first rectangular patches 4a,4b,4c,4d gradually decrease from the connection end of the second patch array with the pad 11 to the other end.
Preferably, the length and width of the second center signal line 12c between the adjacent second rectangular patches 9a,9b,9c,9d are the same.
Preferably, a second impedance transformation line 10a is further included, and the second impedance transformation line 10a is disposed between the pad 11 and the second patch array.
The second rectangular patches of the second patch array of the receiving antenna are divided into four groups 9a,9b,9c and 9d in total, and are connected through a second central signal line 12c of the coplanar waveguide, wherein the group 9d at the middle has a second impedance transformation line 10a in addition to a microstrip connecting line.
Preferably, the number of the first patch array and the second patch array is two. Wherein two of the first patch arrays are at an angle of 180 °. Two of the second patch arrays are at a 180 ° angle.
Preferably, two second shorting members 12b are connected to each second ground patch 12 a. The number of the second ground patches 12a of the coplanar waveguide of the receiving antenna is 12, and the short-circuit parts 12b are symmetrically loaded on the second ground patches 12a of the coplanar waveguide in a group of two. Wherein the second ground patch 12a is rectangular.
The rectangular microstrip series-fed antenna based on the grounded coplanar waveguide has the characteristics of low profile, low cost and simple manufacture, and has a firm grounded structure, relatively low radiation loss and good high-order mode suppression.
Example 1
Referring to fig. 1 and 2, the rectangular microstrip series-fed antenna based on the grounded coplanar waveguide of the present invention,
the transmitting antenna comprises a first dielectric substrate 1, the thickness of which is far smaller than the wavelength of a working frequency point; a first metal patch located on one surface of the first dielectric substrate 1, the first metal patch comprising a transmission line 3 of a wave port, first rectangular patches 4a,4b,4c,4d of a series-fed transmitting antenna, a first impedance transformation line 5a, a rectangular first ground patch 6a of a coplanar waveguide and a first central signal line 6c of the coplanar waveguide connecting the first rectangular patches 4a,4b,4c,4 d; a first metal floor 2 located on the other surface of the first dielectric substrate 1; a plurality of first short-circuit members 6b penetrating the first dielectric substrate 1 connect the rectangular first ground patch 6a of the coplanar waveguide in the metal patches with the first metal ground plane 2.
Preferably, in the present embodiment, the connection point of the transmission line 3 of the wave port and the transmitting antenna is located at one side of the first impedance transformation line 5a to ensure that the antenna array has a desired amplitude phase distribution.
The first rectangular patches are divided into four groups 4a,4b,4c and 4d in total, because the positions of the radiating elements are relatively fixed, and amplitude weighting can be realized only by tapering the current amplitude, the widths of the four groups of first rectangular patches are the same, the lengths of the four groups of first rectangular patches are increased in a certain ratio, and the lengths of the microstrip connecting lines between every two groups of first rectangular patches are the same. The number of the rectangular first ground patches 6a of the coplanar waveguide is 12, and the first short-circuit part 6b is symmetrically loaded on the rectangular first ground patches 6a of the coplanar waveguide in a group of two, so that relatively low radiation loss and good high-order mode suppression are realized.
Referring to fig. 4, 5 and 6, the receiving antenna includes a second dielectric substrate 7 with a thickness much smaller than the wavelength of the working frequency point; the second metal patch is positioned on one surface of the second dielectric substrate 7 and comprises second rectangular patches 9a,9b,9c and 9d for series feeding, a second impedance transformation line 10a, a pad 11 of a coaxial feed port, a rectangular second grounding patch 12a of the coplanar waveguide, and a second central signal line 12c of the coplanar waveguide connected with the adjacent second rectangular patches 9a,9b,9c and 9 d; a second metal floor 8 on the other surface of the second dielectric substrate 7; a plurality of second short circuit parts 12b penetrating the second dielectric substrate 7 connect the rectangular second ground patch 12a of the coplanar waveguide of the second metal patch with the second metal floor 8; coaxial feed ports 13 connected to the pads 11 through the second dielectric substrate 7 are further optimized in the present invention, and the second rectangular patches of the receiving antenna are grouped into four groups 9a,9b,9c,9d in total, and connected by a second central signal line 12c connecting the coplanar waveguides of adjacent second rectangular patches. Wherein the middle group 9d has a second impedance transformation line 10a in addition to a microstrip connection line. Preferably, in this embodiment, the widths of the four sets of second rectangular patches of the transmitting antenna are the same, the lengths are increased according to a certain ratio, and the lengths and the widths of the second central signal lines 12c of the coplanar waveguides in the middle of each set of second rectangular patches are the same, so as to ensure that the amplitude weighting is realized by tapering the current amplitude under the condition that the positions of the radiating elements are relatively fixed. The number of the second rectangular ground patches 12a of the coplanar waveguide of the receiving antenna is 12, the number of the second signal conductor lines 12c of the coplanar waveguide of the transmitting antenna is 12, and the second short-circuit part 12b is symmetrically loaded on the second rectangular ground patches 12a of the coplanar waveguide in a set of two, so that relatively low radiation loss and good high-order mode suppression are realized. The receiving antenna inputs signals through a coaxial feeding port 13, and a bonding pad 11 of the coaxial feeding port of the receiving antenna is positioned at one side of an impedance transformation line of the series-fed antenna so as to ensure that the antenna array has required amplitude phase distribution.
The excitation of the microstrip antenna array unit needs to consider the radiation power and the realizability of the unit, the reflection on each unit junction needs to be considered when the radiation power of the unit is calculated, the radiation power on each unit can be calculated by amplitude taper distribution, in order to reduce the antenna side lobe, the width of the rectangular unit meets the Taylor weighting array, the length of a transmission line is optimized by MOM, FEM and other methods to carry out phase compensation, the antenna resonates in the same direction, and the microstrip antenna with low side lobe, high gain and narrow beam meeting the engineering requirement can be designed. The close spacing distance of the grounded coplanar waveguide is easy to form strong coupling, better parasitic mode suppression capability is obtained, and the radiation loss is also lower. The loss can be effectively reduced by increasing the distance between the signal line and the ground or increasing the width of the signal line, and the loss of the low conductor and the insertion loss are reduced.
Fig. 6 shows the reflection coefficient of the transmitting antenna varying with frequency, and it can be found that the antenna is well matched in the 24G frequency band, and the reflection coefficient is less than-10 dB. It should be noted that the antenna is not limited to operate in the above frequency band, and the antenna can operate in other frequency bands by adjusting the patch and the microstrip transmission line according to the requirement.
Fig. 7 shows the directional patterns of the transmitting antenna in the azimuth plane and the elevation plane at the center of the 24G frequency band, wherein the antenna is designed to be a wide beam in the azimuth plane and a narrow beam in the elevation plane. And the Taylor algorithm is adopted to perform low side lobe synthesis on the histogram, and the side lobe suppression ratio is better than-17 dB.
Fig. 8 shows the reflection coefficient of the received signal with frequency, and it can be found that the antenna is well matched in the 24G frequency band, and the reflection coefficient is less than-10 dB. It should be noted that the antenna is not limited to operate in the above frequency band, and the antenna can operate in other frequency bands by adjusting the patch and the microstrip transmission line according to the requirement.
Fig. 9 shows the directivity pattern of the receiving antenna in the azimuth plane and the elevation plane at the center of the 24G band, where the antenna is designed as a wide beam in the azimuth plane and as a narrow beam in the elevation plane. And the Taylor algorithm is adopted to perform low side lobe synthesis on the histogram, and the side lobe suppression ratio is better than-21 dB.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can understand that the modifications or substitutions within the technical scope of the present invention are included in the scope of the present invention, and therefore, the scope of the present invention should be subject to the protection scope of the claims.
Claims (10)
1. The rectangular microstrip series-fed antenna based on the grounded coplanar waveguide is characterized by comprising a transmitting antenna, wherein the transmitting antenna comprises a first dielectric substrate (1), a first metal floor (2), a first metal patch and a first short-circuit part (6 b);
the first metal patch and the first metal floor (2) are respectively arranged on two surfaces of the first medium substrate (1);
the first metal patch comprises a transmission line (3) of a wave port, a first patch array, a first ground patch (6 a) of a coplanar waveguide and a first central signal line (6 c) of the coplanar waveguide;
the first patch array comprises a number of first rectangular patches (4 a,4b,4c,4 d) fed in series;
the transmission line (3) is connected with one end of the first patch array;
the adjacent first rectangular patches (4 a,4b,4c,4 d) are connected through the first central signal line (6 c);
the first grounding patches (6 a) are arranged on two sides of the first central signal line (6 c);
the first short-circuit part (6b) penetrates the first dielectric substrate (1) and connects the first ground patch (6 a) and the first metal ground plate (2).
2. The rectangular microstrip series feed antenna based on grounded coplanar waveguide of claim 1 wherein: the antenna also comprises a receiving antenna, wherein the receiving antenna comprises a second dielectric substrate (7), a second metal floor (8), a second metal patch, a second short-circuit part (12b), a bonding pad (11) and a coaxial feed port (13);
the second metal patch and the second metal floor (8) are respectively arranged on two surfaces of the second medium substrate (7);
the second metal patch comprises a second patch array, a second ground patch (12 a) of the coplanar waveguide and a second central signal line (12 c) of the coplanar waveguide;
the second patch array comprises a number of second rectangular patches (9 a,9b,9c,9 d) fed in series;
the pad (11) is connected with one end of the second patch array;
the adjacent second rectangular patches (9 a,9b,9c,9 d) are connected through the second central signal line (12 c);
the second grounding patches (12 a) are arranged on two sides of the second central signal line (12 c);
the second short-circuit part (12b) penetrates the second dielectric substrate (7) and connects the second ground patch (12 a) and the second metal floor (8);
the coaxial feed port (13) penetrates through the second dielectric substrate (7) and is connected to the pad (11).
3. The rectangular microstrip series feed antenna based on grounded coplanar waveguide of claim 1 wherein: the widths of the first rectangular patches (4 a,4b,4c,4 d) are the same, the length ratio of the adjacent first rectangular patches (4 a,4b,4c,4 d) is a fixed value, and the lengths of the first rectangular patches (4 a,4b,4c,4 d) are gradually reduced from the connecting end of the first patch array and the transmission line (3) to the other end.
4. The rectangular microstrip series feed antenna based on grounded coplanar waveguide of claim 2 wherein: the widths of the second rectangular patches (9 a,9b,9c and 9 d) are the same, the length ratio of the adjacent second rectangular patches (9 a,9b,9c and 9 d) is a fixed value, and the lengths of the first rectangular patches (4 a,4b,4c and 4 d) are gradually reduced from the connection ends of the second patch array and the bonding pad (11) to the other ends.
5. The rectangular microstrip series feed antenna based on grounded coplanar waveguide of claim 1 wherein: the length and width of the first central signal line (6 c) between adjacent first rectangular patches (4 a,4b,4c,4 d) are the same.
6. The rectangular microstrip series feed antenna based on grounded coplanar waveguide of claim 2 wherein: the lengths and widths of the second center signal lines (12 c) between adjacent second rectangular patches (9 a,9b,9c,9 d) are the same.
7. The rectangular microstrip series feed antenna based on grounded coplanar waveguide of claim 1 wherein: the antenna further comprises a first impedance transformation line (5 a), and the first impedance transformation line (5 a) is arranged between the transmission line (3) and the first patch array.
8. The rectangular microstrip series feed antenna based on grounded coplanar waveguide of claim 2 wherein: the chip is characterized by further comprising a second impedance transformation line (10 a), wherein the second impedance transformation line (10 a) is arranged between the pad (11) and the second patch array.
9. The rectangular microstrip series feed antenna based on grounded coplanar waveguide of claim 1 wherein: the number of the first patch array and the second patch array is two.
10. The rectangular microstrip series feed antenna based on grounded coplanar waveguide of claim 2 wherein: two first short-circuit parts (6b) are connected to each first ground patch (6 a), and two second short-circuit parts (12b) are connected to each second ground patch (12 a).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109786985A (en) * | 2018-12-12 | 2019-05-21 | 南京安捷智造科技有限公司 | A kind of Rectangular Microstrip Standing-wave Antennas antenna based on coplanar waveguide ground |
| TWI767568B (en) * | 2021-02-19 | 2022-06-11 | 健鼎科技股份有限公司 | Array antenna with narrow beam and low profile applied to millimeter wave radar for distance measurement in well |
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2018
- 2018-12-12 CN CN201822085089.2U patent/CN210074169U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109786985A (en) * | 2018-12-12 | 2019-05-21 | 南京安捷智造科技有限公司 | A kind of Rectangular Microstrip Standing-wave Antennas antenna based on coplanar waveguide ground |
| TWI767568B (en) * | 2021-02-19 | 2022-06-11 | 健鼎科技股份有限公司 | Array antenna with narrow beam and low profile applied to millimeter wave radar for distance measurement in well |
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