CN114256616A - Antenna unit and antenna array - Google Patents
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- CN114256616A CN114256616A CN202111651375.0A CN202111651375A CN114256616A CN 114256616 A CN114256616 A CN 114256616A CN 202111651375 A CN202111651375 A CN 202111651375A CN 114256616 A CN114256616 A CN 114256616A
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- 238000005859 coupling reaction Methods 0.000 description 4
- 238000005388 cross polarization Methods 0.000 description 4
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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
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
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Abstract
The application discloses an antenna unit and an antenna array, and relates to the technical field of wireless communication. The antenna unit comprises a first dielectric plate, a second dielectric plate, a metal reflecting floor and a third dielectric plate which are sequentially stacked from top to bottom, and further comprises a microstrip feeder line, a central radiation patch, a patch array and an artificial magnetic conductor structure; the patch array and the artificial magnetic conductor structures are both positioned on the upper surface of the first dielectric slab, and the artificial magnetic conductor structures are distributed on the outer side of the patch array at intervals; the central radiation patch is positioned on the second dielectric slab, and the first dielectric slab covers the central radiation patch; the metal reflection floor is provided with a through hole extending along the vertical direction, the projection of the central radiation patch on the metal reflection floor is intersected with the through hole, and the projection is positioned in the range limited by the through hole in the width direction of the central radiation patch; the microstrip feeder is located below the third dielectric plate.
Description
Technical Field
The present application relates to the field of wireless communication technologies, and in particular, to an antenna unit and an antenna array.
Background
In a modern 5G wireless communication system, a microstrip patch Antenna is widely used due to its advantages of low profile, small size, simple structure, rich performance, convenient manufacture, low cost, and the like, and is a good choice for application of a 5G millimeter-wave package Antenna (Antenna-in-package, AiP).
In order to meet the requirements of miniaturization and high data transmission rate of a 5G millimeter wave wireless communication system, researchers at home and abroad put a great deal of effort on antenna design and research and development. However, in the present stage, the development of patch antennas still faces many problems to be solved urgently. On one hand, the conventional patch antenna has many difficulties in miniaturization, especially in longitudinal miniaturization, and the reduction of the profile of the patch antenna leads to the reduction of the bandwidth and efficiency and the deterioration of the cross polarization performance; on the other hand, the patch antenna also faces many difficulties in increasing the operating bandwidth in a limited profile.
At present, the technology for improving the bandwidth of a patch antenna mainly comprises antenna technologies such as a special dielectric constant dielectric substrate, a laminated patch, an air cavity, a U-shaped patch, an L-shaped patch, an E-shaped patch, a patch load metamaterial and the like.
However, the special dielectric constant dielectric substrate is generally low in dielectric constant and large in thickness, so that the profile of the antenna is increased; in the laminated patch technology, the patch antenna needs to be added with extra section height to realize a broadband laminated structure; the air cavity patch antenna faces the problems of complicated antenna structure, high process difficulty in a millimeter wave high-density integrated system and the like; the wide frequency band is easy to realize by utilizing L-shaped, U-shaped, E-shaped and other structures, but the asymmetrical patch structure can cause the problem of high cross polarization; the bandwidth of a patch antenna loaded with metamaterials (such as artificial magnetic conductors) in modern antenna engineering can be increased to a certain extent, but the bandwidth is not increased obviously, the number of required artificial magnetic conductor units is large, the area of the antenna unit is increased, and the antenna array layout design is not facilitated.
Disclosure of Invention
The present application aims to provide an antenna unit and an antenna array, wherein the antenna unit has the advantages of low profile, large bandwidth and high gain.
In a first aspect, the present application provides an antenna unit, including a first dielectric slab, a second dielectric slab, a metal reflective floor, a third dielectric slab, a microstrip feeder, a central radiation patch, a patch array, and an artificial magnetic conductor structure, which are sequentially stacked from top to bottom;
the patch array and the artificial magnetic conductor structures are both positioned on the upper surface of the first dielectric slab, and the artificial magnetic conductor structures are distributed on the outer side of the patch array at intervals;
the central radiation patch is positioned on the second dielectric slab, and the first dielectric slab covers the central radiation patch;
the metal reflection floor is provided with a through hole extending along the vertical direction, the projection of the central radiation patch on the metal reflection floor is intersected with the through hole, the central radiation patch is provided with a length direction and a width direction which are perpendicular to each other, the length direction is consistent with the corresponding inner diameter direction of the through hole, and the projection is positioned in the range limited by the through hole in the width direction;
the microstrip feeder is located below the third dielectric plate, the microstrip feeder is a conducting wire with an open-circuit terminal, one end of the microstrip feeder is located below the through hole, and the other end of the microstrip feeder is connected with the feed port.
By adopting the technical scheme, the patch array and the artificial magnetic conductor are distributed at intervals, no electrical connection exists between the patch array and the artificial magnetic conductor, the first dielectric plate enables no electrical connection to exist between the central radiation patch and the patch array, the second dielectric plate enables no electrical connection to exist between the central radiation patch and the metal reflection floor, and the third dielectric plate enables no electrical connection to exist between the metal reflection floor and the microstrip feeder line. The central radiation patch, the patch array and the artificial magnetic conductor structure all use a metal reflection floor as a reflection plane; so, on the one hand, the microstrip feeder can be through the through-hole to central radiation paster coupling feed, produces the double resonance mode that has two resonance frequency points, and central radiation paster can encourage the paster array and produce a resonance frequency point, and the paster array can produce the surface wave and encourage artifical magnetic conductor structure and produce a resonance frequency point, and four resonance frequency points can widen the impedance bandwidth.
On the other hand, the artificial magnetic conductor structure is positioned around the patch array, so that the physical aperture of the antenna unit can be increased, and the gain is favorably improved; and both are located the upper surface of first dielectric slab, can reduce the quantity of dielectric slab when realizing the resonance, reduce the section.
In summary, the antenna unit provided by the present application has the beneficial effects of low profile, large bandwidth and high gain.
In a second aspect, the present application provides an antenna array comprising a plurality of any one of the above antenna units arranged at intervals. Based on the above-mentioned beneficial effect who is applied to antenna element of 5G millimeter wave communication, the application provides an antenna array has overall dimension and is little, the great beneficial effect of impedance bandwidth.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a cross-sectional view of an antenna unit according to an embodiment of the present application;
fig. 2 is a top perspective view of an antenna unit provided in an embodiment of the present application;
fig. 3 is a graph corresponding to gain, reflection coefficient and frequency obtained by simulation of an antenna unit according to an embodiment of the present application, where a dotted line corresponds to the gain and a solid line corresponds to the reflection coefficient.
Reference numerals:
1-artificial magnetic conductor unit, 2-patch unit, 3-central radiation patch, 4-metal reflection floor,
41-through hole, 5-microstrip feeder line, 6-first dielectric plate, 7-second dielectric plate, 8-third dielectric plate.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application 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 merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" 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.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In a first aspect, referring to fig. 1 and fig. 2, the present application provides an antenna unit, including a first dielectric plate 6, a second dielectric plate 7, a metal reflective floor 4, and a third dielectric plate 8, which are stacked in sequence from top to bottom, and further including a microstrip feeder 5, a central radiation patch 3, a patch array, and an artificial magnetic conductor structure;
the patch array and the artificial magnetic conductor structures are both positioned on the upper surface of the first dielectric slab 6, and the artificial magnetic conductor structures are distributed on the outer side of the patch array at intervals;
the central radiation patch 3 is positioned on the second dielectric plate 7, and the first dielectric plate 6 covers the central radiation patch 3;
the metal reflection floor 4 is provided with a through hole 41 extending along the up-down direction, the projection of the central radiation patch 3 on the metal reflection floor 4 is intersected with the through hole 41, the central radiation patch 3 is provided with a length direction and a width direction which are perpendicular, the length direction is consistent with the corresponding inner diameter direction of the through hole 41, and the projection is positioned in the range limited by the through hole 41 in the width direction;
the microstrip feeder 5 is located below the third dielectric plate 8, the microstrip feeder 5 is a conducting wire with an open-circuit terminal, one end of the microstrip feeder is located below the through hole 41, and the other end of the microstrip feeder is connected with a feed port.
By adopting the technical scheme, the patch array and the artificial magnetic conductor are distributed at intervals, no electrical connection exists between the patch array and the artificial magnetic conductor, the first dielectric plate 6 enables no electrical connection to exist between the central radiation patch 3 and the patch array, the second dielectric plate 7 enables no electrical connection to exist between the central radiation patch 3 and the metal reflection floor 4, and the third dielectric plate 8 enables no electrical connection to exist between the metal reflection floor 4 and the microstrip feeder 5. The central radiation patch 3, the patch array and the artificial magnetic conductor structure all use a metal reflection floor 4 as a reflection plane; so, on the one hand, microstrip feeder 5 can be through-hole 41 to central radiation paster 3 coupling feed, produces the dual resonance mode that has two resonance frequency points, and central radiation paster 3 can encourage the paster array and produce a resonance frequency point, and the paster array can produce the surface wave and encourage artifical magnetic conductor structure and produce a resonance frequency point, and four resonance frequency points can widen the impedance bandwidth. For example, as shown in fig. 3, the central radiating patch 3 is fed by the microstrip feed line 5 through the through hole 41 to generate a resonant frequency f129.5GHz and f344.2GHz double resonance mode, the central radiation patch 3 excites the patch array to generate a resonance frequency f2The resonance mode is 34.6GHz, and the patch array excites the artificial magnetic conductor structure to generate a resonance frequency point f4Four close resonance frequency points expand the impedance bandwidth as a resonance mode of 48.5 GHz.
On the other hand, the artificial magnetic conductor structure is positioned around the patch array, so that the physical aperture of the antenna unit can be increased, and the gain is favorably improved; and both are located the upper surface of first dielectric slab 6, can realize the resonance while, reduce the quantity of dielectric slab, reduce the section. For example, as shown in FIG. 3, the antenna unit achieves a maximum gain of 10.5dBi at 48.1GHz in the operating band (i.e., 28GHz-49.3 GHz), while the average gain of the antenna unit is 8.5dBi in the operating band.
In summary, the antenna unit provided by the present application has the beneficial effects of low profile, large bandwidth and high gain. The method can be applied to the technical field of 5G communication.
In one possible implementation manner, the artificial magnetic conductor structure includes a plurality of artificial magnetic conductor units which are distributed around the patch array at intervals and have no electrical connection, and the patch array includes a plurality of patch units which are arranged at intervals and have no electrical connection. Wherein the spacing facilitates the separation of the plurality of artificial magnetic conductor units to achieve a non-electrical connection. Similarly, the spacing facilitates the separation of multiple patch units 2 to achieve no electrical connection. Each patch element 2 in the patch array may function as an excitation for each artificial magnetic conductor element.
Wherein, the artificial magnetic conductor unit 1, the patch unit 2 and the central radiation patch 3 are all made of metal materials.
In one possible implementation, referring to fig. 2, the projections of the patch elements 2 on the second dielectric plate 7 are distributed around the central radiating patch 3. Therefore, the radiation aperture of the antenna unit can be increased, and the gain is favorably improved.
In a possible implementation manner, referring to fig. 2, the central radiation patch 3 is rectangular, the patch array is a rectangular array, the patch unit 2 is rectangular, the artificial magnetic conductor unit 1 is rectangular, and a plurality of artificial magnetic conductor units 1 are symmetrically distributed on two sides of the patch array. Under the condition of adopting the technical scheme, the rectangular array formed by the rectangular patch units 2 is distributed around the rectangular central radiation patch 3 and can be excited by the central radiation patch 3; the artificial magnetic conductor units 1 are symmetrically distributed on two sides of the rectangular array and can be excited by the rectangular array; moreover, the rectangular patch has a regular shape, so that the processing and the design are convenient, radiators with approximate resonant frequencies (namely three of the central radiation patch 3, the patch unit 2 and the artificial magnetic conductor unit 1) can be obtained more conveniently by controlling the size, the required four resonant frequency points are obtained, and a large impedance bandwidth is obtained while the low section of the antenna is ensured.
In an example, referring to fig. 2, the through hole 41 may be rectangular, the central radiation patch 3 may also be rectangular, the length directions of the two are perpendicular, and the width dimension of the central radiation patch 3 is smaller than the long inner diameter of the rectangular through hole 41, so that the projection of the central radiation patch 3 on the metal reflective floor 4 in the width direction of the central radiation patch 3 may fall within the range defined by the through hole 41. In this way, the microstrip feed line 5 may be coupled to feed the central radiating patch 3 through the via 41.
In an example, referring to fig. 2, projections of a plurality of patch units 2 in a patch array on the metal reflective floor 4 may be distributed around the through hole 41, and the patch array radiates around the through hole 41.
In one possible embodiment, referring to FIG. 2, the patch array comprises N × N patch units 2, and M artificial magnetic conductor units are distributed on each side of the patch array along the long side direction of the patch units 2, wherein M > N ≧ 2. Under the condition of adopting the technical scheme, the M artificial magnetic conductor units distributed on the two sides of the patch array can obtain excitation with the same degree. Further, a large number of artificial magnetic conductor elements are distributed in the longitudinal direction of the patch element 2, and the radiation aperture in this direction can be increased to improve the gain.
The M artificial magnetic conductor units on each side of the patch array can be distributed at even intervals, and the M artificial magnetic conductor units on the two sides can be symmetrically distributed relative to the patch array, so that the symmetric structure is favorable for reducing cross polarization performance.
In one example, N is 2 and M is 6. The four patch units 2 surround the center radiation patch 3, and after being excited by the center radiation patch 3, the 12-in-total artificial magnetic conductor units 1 on the two sides can be excited, so that the four resonance frequency points are obtained. In this way, the area of the antenna element is reduced as much as possible while increasing the gain by increasing the radiation aperture.
In one example, the central radiating patch 3 has dimensions of 0.15mm x 1.55mm, the patch elements 2 have dimensions of 0.7mm x 1.45mm, the artificial magnetic conductor elements 1 have dimensions of 1mm x 1mm, and the distance between two adjacent artificial magnetic conductor elements 1 is 0.1mm on either side of the patch array.
In one possible implementation, referring to fig. 2, the center of the artificial magnetic conductor structure, the center of the patch array, the center of the central radiation patch 3, and the center of the through hole 41 are all collinear with the center of the metal reflective floor 4 in the up-down direction. Therefore, the antenna unit can be in a central symmetrical structure, and cross polarization performance is favorably reduced.
In one possible implementation, the first dielectric plate 6, the second dielectric plate 7, and the third dielectric plate 8 may all be high-frequency dielectric plates. By utilizing the performance of the high-frequency dielectric plate, the profile can be reduced, and the bandwidth can be improved. For example, the first dielectric plate 6 and the second dielectric plate 7 may each be an HL972 high-frequency dielectric plate, and the third dielectric plate 8 may each be a GHPL-970 high-frequency dielectric plate. For another example, the first dielectric plate 6 and the second dielectric plate 7 may each be a Rogers4350B, and the third dielectric plate 8 may each be a Rogers4450T high-frequency dielectric plate.
In a possible embodiment, referring to fig. 1, the first dielectric plate 6 and the second dielectric plate 7 have the same thickness and are larger than the third dielectric plate 8. The first dielectric plate 6 and the second dielectric plate 7 are thicker, so that impedance bandwidth can be improved, and the third dielectric plate 8 is thinner, so that the section can be reduced as much as possible on the premise of separating the metal reflecting plate from the microstrip feeder 5.
In an example, the thicknesses of the first dielectric plate 6 and the second dielectric plate 7 may be 250um HL972 high-frequency dielectric plates, the thickness of the third dielectric plate 8 may be 40um GHPL-970 high-frequency dielectric plates, the central radiation patch 3 is 0.15mm × 1.55mm rectangular, the patch array includes 2 × 2 rectangular patches 0.7mm × 1.45mm, the side length of each rectangular artificial magnetic conductor unit 1 is 1mm × 1mm, and the distance between two adjacent artificial magnetic conductor units 1 is 0.1 mm. Accordingly, the present application provides antenna elements having dimensions of 10mm x 0.6mm, and approximately 1.26 λ38GHz×1.26λ38GHz×0.075λ38GHz(λ38GHzA wavelength in free space at 38 GHz). Thus, the microstrip feeder 5 can feed the central radiation patch 3 in a coupling manner through the through hole 41 to generate a resonance frequency point f129.5GHz and f344.2GHz double resonance mode, the central radiation patch 3 excites the patch array to generate a resonance frequency f2The resonance mode is 34.6GHz, and the patch array excites the artificial magnetic conductor structure to generate a resonance frequency point f4The four resonant modes with close frequencies are beneficial to realizing the broadband characteristic of the antenna, expanding the impedance bandwidth, realizing the wide impedance bandwidth from 28GHz to 49.3GHz and the relative bandwidth of about 55 percent, and can be applied to 5G millimeter wave communication.
In a possible embodiment, the distance from the open end of the microstrip feed line 5 to the central axis of the via is a quarter wavelength. As shown in fig. 1 in particular, the microstrip feed line 5 extends from right to left with the open end at the left side of the via. So as to realize the coupling feed of the microstrip feeder 5 and the central radiation patch 3, and the central radiation patch 3 can obtain larger energy, which is beneficial to improving the gain. Wherein the wavelength may be λ38GHzThe microstrip feed line 5 may be an open-ended 50 Ω conductor.
In a second aspect, the present application provides an antenna array comprising a plurality of any one of the above antenna units arranged at intervals. Based on the beneficial effect of above-mentioned antenna element, this application provides an antenna array has overall dimension and is little, the great beneficial effect of impedance bandwidth.
In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. An antenna unit is characterized by comprising a first dielectric plate, a second dielectric plate, a metal reflecting floor and a third dielectric plate which are sequentially stacked from top to bottom, and further comprising a microstrip feeder line, a central radiation patch, a patch array and an artificial magnetic conductor structure;
the patch array and the artificial magnetic conductor structures are both positioned on the upper surface of the first dielectric slab, and the artificial magnetic conductor structures are distributed on the outer side of the patch array at intervals;
the central radiation patch is positioned on the second dielectric slab, and the first dielectric slab covers the central radiation patch;
the metal reflection floor is provided with a through hole extending along the up-down direction, the projection of the central radiation patch on the metal reflection floor is intersected with the through hole, the central radiation patch is provided with a length direction and a width direction which are perpendicular, the length direction is consistent with the corresponding inner diameter direction of the through hole, and the projection is positioned in the range limited by the through hole in the width direction;
the microstrip feeder is located below the third dielectric plate, the microstrip feeder is a conducting wire with an open-circuit terminal, one end of the microstrip feeder is located below the through hole, and the other end of the microstrip feeder is connected with a feed port.
2. The antenna element of claim 1, wherein the artificial magnetic conductor structure comprises a plurality of artificial magnetic conductor elements distributed at intervals around the patch array without electrical connection, and wherein the patch array comprises a plurality of patch elements arranged at intervals without electrical connection.
3. The antenna unit of claim 2, wherein projections of the plurality of patch elements on the second dielectric plate are distributed around the center radiating patch.
4. The antenna element of claim 2, wherein the central radiating patch is rectangular, the patch array is a rectangular array, the patch element is rectangular, the artificial magnetic conductor element is rectangular, and a plurality of the artificial magnetic conductor elements are symmetrically distributed on two sides of the patch array.
5. The antenna unit of claim 4, wherein the patch array comprises N x N patch units, and M artificial magnetic conductor units are distributed on each side of the patch array along the long side direction of the patch units, wherein M > N ≧ 2.
6. The antenna element of claim 5, wherein the central radiating patch has dimensions of 0.15mm x 1.55mm, the patch element has dimensions of 0.7mm x 1.45mm, the artificial magnetic conductor element has dimensions of 1mm x 1mm, and the distance between two adjacent artificial magnetic conductor elements is 0.1mm on either side of the patch array.
7. The antenna unit of any one of claims 1-6, wherein a center of the artificial magnetic conductor structure, a center of the patch array, a center of the central radiating patch, and a center of the through hole are collinear with a center of the metal reflective floor in the up-down direction.
8. The antenna unit according to any one of claims 1 to 6, wherein the first dielectric plate, the second dielectric plate, and the third dielectric plate are high-frequency dielectric plates;
and/or the first dielectric plate and the second dielectric plate have the same thickness and are larger than the third dielectric plate.
9. The antenna element of any of claims 1-6, wherein the distance from the open end of the microstrip feed line to the central axis of the via is a quarter wavelength.
10. An antenna array comprising a plurality of antenna elements as claimed in any one of claims 1 to 9 arranged at intervals.
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| CN202111651375.0A CN114256616A (en) | 2021-12-30 | 2021-12-30 | Antenna unit and antenna array |
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