CN111697329A - Bidirectional co-rotating circularly polarized antenna - Google Patents
Bidirectional co-rotating circularly polarized antenna Download PDFInfo
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- CN111697329A CN111697329A CN201910188659.7A CN201910188659A CN111697329A CN 111697329 A CN111697329 A CN 111697329A CN 201910188659 A CN201910188659 A CN 201910188659A CN 111697329 A CN111697329 A CN 111697329A
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- metal patch
- circularly polarized
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- polarized antenna
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0428—Substantially flat resonant element parallel to ground plane, e.g. patch antenna radiating a circular polarised wave
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
- H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
- H01Q9/285—Planar dipole
Abstract
The invention provides a bidirectional co-rotation circularly polarized antenna, and belongs to the field of wireless communication. Two-way co-rotating circularly polarized antenna, comprising: the printed circuit board comprises a substrate, wherein a first surface and a second surface of the substrate are both provided with printed circuits; the first side of the first metal patch is connected with the upper half arm of the first dipole antenna through a first parallel double-line upper branch, and the second side of the first metal patch is connected with the lower half arm of the second dipole antenna through a second parallel double-line upper branch; a second metal patch on the second surface, wherein a first side of the second metal patch is connected with the lower half arm of the first dipole antenna through a first parallel bifilar lower branch, and a second side of the second metal patch is connected with the upper half arm of the second dipole antenna through a second parallel bifilar lower branch; a feed via disposed on the substrate. By the technical scheme, the two-way co-rotation circularly polarized antenna with the single substrate can be realized, the size is small, the installation is convenient, a resonant cavity is not required to be formed by a large number of through holes, and the processing requirement is low.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a bidirectional co-rotation circularly polarized antenna.
Background
The antenna with the bidirectional same-rotation circular polarization radiation performance is very suitable for special communication scenes, such as underground coal mine communication, bridge-deck communication, temporary wireless base stations and the like. The traditional bidirectional co-rotating antenna is of a multi-layer plate structure or a three-dimensional structure: the bidirectional co-rotation radiation can be realized by using a stacking mode of the one-way circularly polarized antenna, for example, two patch antennas are spliced back to back by using a double-layer dielectric substrate; the two vertically arranged excitation sources with the space of quarter wavelength are used for exciting the waveguide to realize bidirectional co-rotation radiation; a frequency selective surface is loaded on the slot antenna side to reverse the rotation direction of the circularly polarized slot side. In addition, the existing double-cross gap cavity with the characteristic of bidirectional co-rotation circular polarization also realizes the bidirectional co-rotation circular polarization antenna with a single-layer plate structure.
The existing bidirectional co-rotating circularly polarized antenna with a multi-layer plate structure or a three-dimensional structure has the problems of large volume, inconvenience in installation and the like; the microstrip patch antenna has the problems of more complex structure, more layers of used substrates, higher manufacturing cost and the like. The existing bidirectional co-rotating circularly polarized antenna with a single-layer structure needs to apply a large number of metal through holes, and strict requirements are imposed on the distance between the through holes, so that the requirement on processing of a Printed Circuit Board (PCB) is high, and the cost is also high.
Disclosure of Invention
The invention aims to solve the technical problem of providing a single-substrate bidirectional co-rotation circularly polarized antenna which is small in size, convenient to install, free of a large number of through holes to form a resonant cavity and low in requirement on PCB processing.
To solve the above technical problem, embodiments of the present invention provide the following technical solutions:
the embodiment of the invention provides a bidirectional co-rotation circularly polarized antenna, which comprises:
the circuit board comprises a substrate, wherein a first surface and a second surface of the substrate are both provided with printed circuits;
the first metal patch is arranged on the first surface, a first side of the first metal patch is connected with the upper half arm of the first dipole antenna through the upper branch of the first parallel double line, a second side of the first metal patch is connected with the lower half arm of the second dipole antenna through the upper branch of the second parallel double line, and the first side and the second side are opposite;
a second metal patch arranged on the second surface, wherein a first side of the second metal patch is connected with the lower half arm of the first dipole antenna through the lower branch of the first parallel double line, a second side of the second metal patch is connected with the upper half arm of the second dipole antenna through the lower branch of the second parallel double line, and the second metal patch and the first metal patch are the same in size;
and a feeding through hole disposed on the substrate, the feeding through hole being connected to the metal on the first surface and the second surface, respectively.
Further, the air conditioner is provided with a fan,
the upper branch of the first parallel double line and the upper branch of the second parallel double line are positioned on the same straight line, and the straight line passes through the center of the first metal patch;
the lower branch of the first parallel double line and the lower branch of the second parallel double line are positioned on the same straight line, and the straight line passes through the center of the second metal patch.
Further, the air conditioner is provided with a fan,
be provided with feed structure on the second metal patch, feed structure includes first hole, surrounds the second metal ring in first hole, surrounds the third nonmetal ring of second metal ring, the feed through-hole is in orthographic projection on the second metal patch with second metal ring at least part overlaps.
Further, the air conditioner is provided with a fan,
the length of the substrate along the X-axis direction is 77.5 mm, the length along the Y-axis direction is 60 mm, and the thickness along the Z-axis direction is 2.54 mm.
Further, the air conditioner is provided with a fan,
the first metal patch and the second metal patch are square patches, and the side length of each square patch is 38.5 millimeters.
Further, the air conditioner is provided with a fan,
the first dipole antenna and the second dipole antenna are the same in size, 57 millimeters in total length and 5 millimeters in width.
Further, the air conditioner is provided with a fan,
the first parallel double lines and the second parallel double lines are the same in size, and are 12 mm in length and 1 mm in width.
Further, the air conditioner is provided with a fan,
the feed through hole is located on the center line of the second metal patch along the Y-axis direction, and the distance between the feed through hole and the edge of the second metal patch in the X-axis direction is 14.25 millimeters.
Further, the air conditioner is provided with a fan,
the diameter of the feed through hole is 1.3 mm.
Further, the air conditioner is provided with a fan,
the substrate has a dielectric constant of 2.55 and a loss angle of 0.0019.
The embodiment of the invention has the following beneficial effects:
in the scheme, the two-way co-rotation circularly polarized antenna is realized by utilizing the single-layer dielectric substrate, the upper metal patch and the lower metal patch are respectively connected with the two arms of one dipole antenna by using parallel double lines at the two radiation port surfaces of the substrate and the metal patches with the same size, the connection modes of the two sides are different, namely, one metal patch is connected with the upper half arm of one dipole antenna and the lower half arm of the other dipole antenna, and the other metal patch is connected with the lower half arm of one dipole antenna and the upper half arm of the other dipole antenna. The fringe electric field of the metal patch is perpendicular to the radiation electric field of the dipole antenna, and the two perpendicular electric fields have 90-degree phase difference by adjusting the length and the width of the parallel double lines, so that bidirectional co-rotation circular polarization radiation is realized in the + Z direction and the-Z direction. By the technical scheme, the two-way co-rotation circularly polarized antenna with the single substrate can be realized, the size is small, the installation is convenient, a resonant cavity is not required to be formed by a large number of through holes, and the requirement on PCB processing is low.
Drawings
FIG. 1 is an exploded view of a bi-directional co-rotating circularly polarized antenna according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of an embodiment of the present invention to implement bidirectional co-rotation;
FIG. 3 is a front view and a side view of a bi-directional co-rotating circularly polarized antenna in accordance with an embodiment of the present invention;
fig. 4 is a schematic diagram of the reflection coefficient, the right-hand directional patterns in the XZ and YZ planes at 2.4GHz, and the axial ratio curves in the + Z and-Z directions of the bi-directional co-rotating circularly polarized antenna according to the embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention clearer, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
The embodiment of the invention provides a single-substrate two-way co-rotation circularly polarized antenna which is small in size, convenient to install, free of a large number of through holes to form a resonant cavity and low in requirement on PCB processing.
The embodiment of the invention provides a bidirectional co-rotation circularly polarized antenna, which comprises:
the circuit board comprises a substrate, wherein a first surface and a second surface of the substrate are both provided with printed circuits;
the first metal patch is arranged on the first surface, a first side of the first metal patch is connected with the upper half arm of the first dipole antenna through the upper branch of the first parallel double line, a second side of the first metal patch is connected with the lower half arm of the second dipole antenna through the upper branch of the second parallel double line, and the first side and the second side are opposite;
a second metal patch arranged on the second surface, wherein a first side of the second metal patch is connected with the lower half arm of the first dipole antenna through the lower branch of the first parallel double line, a second side of the second metal patch is connected with the upper half arm of the second dipole antenna through the lower branch of the second parallel double line, and the second metal patch and the first metal patch are the same in size;
and a feeding through hole disposed on the substrate, the feeding through hole being connected to the metal on the first surface and the second surface, respectively.
In this embodiment, a single-layer dielectric substrate is used to implement a bidirectional co-rotation circularly polarized antenna, and the upper and lower metal patches are respectively connected to two arms of a dipole antenna by parallel double lines at two radiation port surfaces of the substrate and the metal patches with the same size, and the connection modes at two sides are different, that is, one metal patch is connected to the upper half arm of one dipole antenna and the lower half arm of the other dipole antenna, and the other metal patch is connected to the lower half arm of one dipole antenna and the upper half arm of the other dipole antenna. The fringe electric field of the metal patch is perpendicular to the radiation electric field of the dipole antenna, and the two perpendicular electric fields have 90-degree phase difference by adjusting the length and the width of the parallel double lines, so that bidirectional co-rotation circular polarization radiation is realized in the + Z direction and the-Z direction. By the technical scheme, the two-way co-rotation circularly polarized antenna with the single substrate can be realized, the size is small, the installation is convenient, a resonant cavity is not required to be formed by a large number of through holes, and the requirement on PCB processing is low.
Further, the air conditioner is provided with a fan,
the upper branch of the first parallel double line and the upper branch of the second parallel double line are positioned on the same straight line, and the straight line passes through the center of the first metal patch;
the lower branch of the first parallel double line and the lower branch of the second parallel double line are positioned on the same straight line, and the straight line passes through the center of the second metal patch.
Further, the air conditioner is provided with a fan,
be provided with feed structure on the second metal patch, feed structure includes first hole, surrounds the second metal ring in first hole, surrounds the third nonmetal ring of second metal ring, the feed through-hole is in orthographic projection on the second metal patch with second metal ring at least part overlaps.
Further, the air conditioner is provided with a fan,
the length of the substrate along the X-axis direction is 77.5 mm, the length along the Y-axis direction is 60 mm, and the thickness along the Z-axis direction is 2.54 mm.
Further, the air conditioner is provided with a fan,
the first metal patch and the second metal patch are square patches, and the side length of each square patch is 38.5 millimeters.
Further, the air conditioner is provided with a fan,
the first dipole antenna and the second dipole antenna are the same in size, 57 millimeters in total length and 5 millimeters in width.
Further, the air conditioner is provided with a fan,
the first parallel double lines and the second parallel double lines are the same in size, and are 12 mm in length and 1 mm in width.
Further, the air conditioner is provided with a fan,
the feed through hole is located on the center line of the second metal patch along the Y-axis direction, and the distance between the feed through hole and the edge of the second metal patch in the X-axis direction is 14.25 millimeters.
Further, the air conditioner is provided with a fan,
the diameter of the feed through hole is 1.3 mm.
Further, the air conditioner is provided with a fan,
the substrate has a dielectric constant of 2.55 and a loss angle of 0.0019.
The following describes the bidirectional co-rotating circularly polarized antenna of the present invention with reference to the accompanying drawings and specific embodiments:
referring to fig. 1, the bidirectional co-rotating circularly polarized antenna includes a substrate 2 based on a double-sided printed circuit board process, wherein metal patches 15 and 35 of the same size are respectively disposed on the front and back sides of the substrate, and the left and right sides of the upper and lower metal patches are respectively connected with two dipoles at the center position through two sections of parallel double lines: on the left side, the front metal patch 15 is connected to the upper arm half 11 of the left dipole via an upper branch 13 of a parallel double line, and the back metal patch 35 is connected to the lower arm half 31 of the left dipole via a lower branch 33 of the parallel double line; on the right side, the front metal patch 15 is connected to the lower arm half 12 of the right dipole by the upper branch 14 of another parallel double line, and the back metal patch 35 is connected to the upper arm half 32 of the right dipole by the lower branch 34 of this parallel double line. The substrate 2 is prepared with a feed through hole 22 for feeding by using a through hole process of a printed circuit board, the feed through hole is a metal via hole and is connected with metals on the front and back surfaces, and the feed through hole 22 projects upwards to a hole 16 on the front metal patch 15 and projects downwards to a hole 41 in the feed structure 4 on the back metal patch 35. The enlarged view in fig. 1 shows the feed structure 4: the feed through hole 22 is located on the metal circle 42, the nonmetal circular ring 43 is a radio frequency signal access point, the inner conductor of the coaxial line is welded on the metal circle 42 across the ring 43, and the outer conductor is welded with the outer edge of the nonmetal circular ring 43.
The principle of the two-way co-rotating circular polarized radiation generated by the single-substrate antenna is shown in fig. 2, in which the substrate is omitted, wherein the solid black line with the central arrow represents the current, the dashed black line with the central arrow represents the electric field, the solid black line with the end arrow represents the spatial radiation electric field, and the arrow directions represent the current and the electric field directions. In fact, the dipole and the fringe field of the metal patch on the left side can generate bidirectional co-rotation radiation. The left dipole mirror image structure and the right dipole mirror image structure realize a binary array and simultaneously keep bidirectional co-rotation. The radiation on the right side is the same principle as on the left side, and the left side is used as an example for illustration. The current of the upper metal patch and the current of the lower metal patch of the metal patch antenna are opposite, as shown in Jtop and Jbottom in FIG. 2, the current of the upper branch and the current of the lower branch on the parallel double lines are also opposite, as shown in Jline in FIG. 2, the upper branch and the lower branch respectively excite one arm of a dipole, the formed current J1 along the Y direction is shown in FIG. 2, and the radiation field Ey of J1 is the same in the + Z direction and the-Z direction, namely the radiation fields are electric fields in the + Y direction; on the other hand, the fringe electric field E1 at the left edge of the metal patch has a phase difference of 180 ° in the + X direction with respect to the radiation electric field Ex1 formed in the + Z direction and the radiation electric field Ex2 formed in the-Z direction. By adjusting the length and the width of the parallel double lines, the electric field at the edge of the metal patch leads the dipole by 90 degrees. Thus, the radiation field and propagation direction in the + Z and-Z directions are shown by the two dashed ellipses in FIG. 2: in the + Z direction, an X-direction electric field Ex1 leads a y-direction electric field Ey90 degrees to form right-hand circularly polarized waves; in the-Z direction, the X-direction electric field Ex2 lags behind the y-direction electric field Ey90, also forming a right-hand circularly polarized wave. Similarly, the right-hand dipole and the fringe electric field at the right edge of the metal patch can also generate right-hand circularly polarized waves. Therefore, the single-substrate antenna can generate bidirectional right-hand circularly polarized radiation. If the connection modes of the dipole arms at the left side and the right side and the upper metal patch and the lower metal patch are simultaneously exchanged, the bidirectional left-handed circularly polarized radiation can be formed.
Fig. 3 shows an embodiment of a single substrate bi-directional right-handed antenna operating at 2.4GHz, where fig. 3(a) and (b) show top and side views, respectively, to illustrate the detailed dimensions of various portions of the antenna. Wherein the length of the substrate 2 along the X direction is 77.5 mm, the length along the Y direction is 60 mm, and the thickness along the Z direction is 2.54 mm; the two metal patches on the front side and the back side are square patches with the same size, and the side length is 38.5 millimeters; the total length of two pairs of dipoles with the same size is 57 mm, and the width is 5 mm; two sections of parallel strip lines with the same size are connected with the center point of the square metal patch, the length of each section of parallel strip lines is 12 mm, and the width of each section of parallel strip lines is 1 mm; the feed through hole 22 is located on the centerline of the metal patch along the Y direction, the distance from the right edge of the metal patch in the X direction is 14.25 mm, the detailed dimensions of the feed structure and the feed through hole are shown in the enlarged view, the diameter of the feed through hole is 1.3mm, the feed through hole is located on a metal circle with the diameter of 2.3 mm, and the width of the non-metal circle is 1 mm. The substrate 2 is made of Taconic TLX-8 plate, the dielectric constant is 2.55, and the loss angle is 0.0019.
Fig. 4 is a schematic diagram of the reflection coefficient of the bidirectional co-rotating circularly polarized antenna designed by using the above parameters, the right-hand directional diagrams in the XZ and YZ planes at 2.4GHz, and the axial ratio curves in the + Z and-Z directions, and the reflection coefficient of the bidirectional co-rotating circularly polarized antenna designed by using the above parameters is given in fig. 4(a), and it can be seen that the-10 dB impedance bandwidth of the single-substrate bidirectional co-rotating circularly polarized antenna operating at 2.4GHz is: 2385 and 2416MHz, the absolute bandwidth is 31MHz, and the relative bandwidth is 1.29%. Fig. 4(b) shows right-hand circularly polarized radiation patterns of the bidirectional co-rotating circularly polarized antenna at a center frequency of 2.4GHz in two planes of XZ and YZ, which include maximum radiation directions in both + Z and-Z directions, and gain in both of the maximum radiation directions is 4.13dBi, which has a bidirectional radiation characteristic. FIG. 4(c) shows the variation curve of the axial ratio with frequency in the + Z and-Z directions, and it can be seen that the two curves are almost coincident, the 3dB axial ratio frequency range satisfying the engineering requirement is 2220-2562MHz, and the impedance bandwidth is completely covered.
In this embodiment, at the two radiation port surfaces of the substrate and the metal patch antenna with the same size, the upper and lower metal patches are respectively connected with two arms of a dipole antenna by parallel double lines, and the connection modes at the two sides are different, that is, the upper arm of the upper metal patch and the left dipole is connected with the lower arm of the right dipole, and the lower arm of the lower metal patch and the left dipole is connected with the upper arm of the right dipole. The fringe electric field of the metal patch is perpendicular to the radiation electric field of the dipole, and the two perpendicular electric fields have 90-degree phase difference by adjusting the length and the width of the parallel double lines, so that bidirectional co-rotation circularly polarized radiation is realized in the + Z direction and the-Z direction.
While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.
Claims (10)
1. A two-way co-rotating circularly polarized antenna, comprising:
the circuit board comprises a substrate, wherein a first surface and a second surface of the substrate are both provided with printed circuits;
the first metal patch is arranged on the first surface, a first side of the first metal patch is connected with the upper half arm of the first dipole antenna through the upper branch of the first parallel double line, a second side of the first metal patch is connected with the lower half arm of the second dipole antenna through the upper branch of the second parallel double line, and the first side and the second side are opposite;
a second metal patch arranged on the second surface, wherein a first side of the second metal patch is connected with the lower half arm of the first dipole antenna through the lower branch of the first parallel double line, a second side of the second metal patch is connected with the upper half arm of the second dipole antenna through the lower branch of the second parallel double line, and the second metal patch and the first metal patch are the same in size;
and a feeding through hole disposed on the substrate, the feeding through hole being connected to the metal on the first surface and the second surface, respectively.
2. The dual-direction co-rotating circularly polarized antenna of claim 1,
the upper branch of the first parallel double line and the upper branch of the second parallel double line are positioned on the same straight line, and the straight line passes through the center of the first metal patch;
the lower branch of the first parallel double line and the lower branch of the second parallel double line are positioned on the same straight line, and the straight line passes through the center of the second metal patch.
3. The two-way co-rotation circularly polarized antenna according to claim 1, wherein a feeding structure is disposed on the second metal patch, the feeding structure includes a first hole, a second metal ring surrounding the first hole, and a third non-metal ring surrounding the second metal ring, and an orthographic projection of the feeding through hole on the second metal patch at least partially overlaps with the second metal ring.
4. The dual-direction co-rotating circularly polarized antenna of claim 1, wherein the substrate has a length of 77.5 mm in the X-axis direction, a length of 60 mm in the Y-axis direction, and a thickness of 2.54 mm in the Z-axis direction.
5. The dual-direction co-rotating circularly polarized antenna of claim 1,
the first metal patch and the second metal patch are square patches, and the side length of each square patch is 38.5 millimeters.
6. The dual-direction co-rotating circularly polarized antenna of claim 1,
the first dipole antenna and the second dipole antenna are the same in size, 57 millimeters in total length and 5 millimeters in width.
7. The dual-direction co-rotating circularly polarized antenna of claim 1,
the first parallel double lines and the second parallel double lines are the same in size, and are 12 mm in length and 1 mm in width.
8. The dual-direction co-rotating circularly polarized antenna of claim 1,
the feed through hole is located on the center line of the second metal patch along the Y-axis direction, and the distance between the feed through hole and the edge of the second metal patch in the X-axis direction is 14.25 millimeters.
9. The dual-direction co-rotating circularly polarized antenna of claim 1,
the diameter of the feed through hole is 1.3 mm.
10. The dual-direction co-rotating circularly polarized antenna of claim 1,
the substrate has a dielectric constant of 2.55 and a loss angle of 0.0019.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910188659.7A CN111697329A (en) | 2019-03-13 | 2019-03-13 | Bidirectional co-rotating circularly polarized antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910188659.7A CN111697329A (en) | 2019-03-13 | 2019-03-13 | Bidirectional co-rotating circularly polarized antenna |
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| CN111697329A true CN111697329A (en) | 2020-09-22 |
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| CN201910188659.7A Pending CN111697329A (en) | 2019-03-13 | 2019-03-13 | Bidirectional co-rotating circularly polarized antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113471694A (en) * | 2021-07-05 | 2021-10-01 | 上海磐启微电子有限公司 | Ultra-wideband RFID antenna |
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| CN105914459A (en) * | 2016-07-04 | 2016-08-31 | 清华大学 | Double-cross slot cavity antenna with bidirectional co-spin circular polarization characteristics |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113471694A (en) * | 2021-07-05 | 2021-10-01 | 上海磐启微电子有限公司 | Ultra-wideband RFID antenna |
| CN113471694B (en) * | 2021-07-05 | 2022-11-25 | 上海磐启微电子有限公司 | Ultra-wideband RFID antenna |
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Application publication date: 20200922 |