Phased-array antenna structure

Abstract

The phased-array antenna structure comprises a first dielectric substrate and a second dielectric substrate which are oppositely arranged, a first metal patch layer is arranged on the surface, facing the second dielectric substrate, of the first dielectric substrate, and a second metal patch layer is arranged on the surface, facing the first dielectric substrate, of the second dielectric substrate. A gap exists between the first metal patch layer and the second metal patch layer; the first metal patch layer comprises at least two first metal patches, the second metal patch layer comprises at least two second metal patches, and the at least two first metal patches and the at least two second metal patches are in one-to-one correspondence; the phased-array antenna structure further comprises an isolation plate, and the isolation plate is located between the two adjacent first metal patches and located between the two adjacent second metal patches, so that the isolation degree of the phased-array antenna structure can be improved, and the signal transmission performance in the phased-array antenna structure can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of antennas, and in particular relates to a phased array antenna structure. Background Art

[0002] Phased array antenna is an antenna system that electronically controls the feeding phase of each radiating element in the antenna array to change the antenna pattern shape and beam scanning direction. Antenna isolation refers to the ratio of the signal power transmitted by one antenna to the signal power received by another antenna. This ratio can reflect the degree of signal interference between the two antennas. The greater the isolation, the lower the degree of signal interference between the two antennas.

[0003] Generally, a phased array antenna is composed of multiple antenna subunits, and the antenna subunit is composed of a feeding structure and a metal patch. With this structure, the feeding structure can feed the metal patch, and the metal patch can radiate electromagnetic waves to the external space after receiving the current transmitted by the feeding structure, thereby realizing the transmission of electromagnetic wave signals; at the same time, the metal patch can receive electromagnetic waves in the external space and convert them into electrical signals. By processing the electrical signals, the signal content of the electromagnetic waves in the external space can be obtained, thereby realizing the reception of electromagnetic wave signals. Among them, sending and receiving signals through multiple antenna subunits can improve the intensity of signal sending and receiving in the phased array antenna, thereby improving the performance of the phased array antenna. However, there is a mutual coupling phenomenon between the two antenna subunits, which causes the signal sent and received by one antenna subunit to be interfered by the other antenna subunit, which in turn causes the isolation between the two antenna subunits to be poor, affecting the performance of signal transmission in the phased array antenna. Summary of the invention

[0004] In order to solve the above problems existing in the prior art, the present invention provides a phased array antenna structure. The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0005] In a first aspect, the present invention provides a phased array antenna structure, comprising a first dielectric substrate and a second dielectric substrate arranged opposite to each other, a first metal patch layer is provided on a surface of the first dielectric substrate facing the second dielectric substrate, a second metal patch layer is provided on a surface of the second dielectric substrate facing the first dielectric substrate, and a gap exists between the first metal patch layer and the second metal patch layer; the first metal patch layer comprises at least two first metal patches, the second metal patch layer comprises at least two second metal patches, and the at least two first metal patches correspond to the at least two second metal patches one by one; the phased array antenna structure also comprises an isolation plate, which is located between two adjacent first metal patches and between two adjacent second metal patches.

[0006] In one embodiment of the present invention, a plurality of first metal patches are provided and the plurality of first metal patches are distributed in an array, a first gap exists between two adjacent first metal patches along the first direction, and a second gap exists between two adjacent first metal patches along the second direction; a plurality of second metal patches are provided and the plurality of second metal patches are distributed in an array, a third gap exists between two adjacent second metal patches along the first direction, and a fourth gap exists between two adjacent second metal patches along the second direction; the first direction and the second direction are perpendicular to each other.

[0007] In one embodiment of the present invention, the isolation plate includes a first plate and a second plate, the first plate and the second plate are fixedly connected, the first plate is located in the first gap and the third gap at the same time, and the second plate is located in the second gap and the fourth gap at the same time.

[0008] In one embodiment of the present invention, the first plate and / or the second plate is a sawtooth structure, which includes a plurality of first teeth and second teeth that are staggered, and the tooth groove opening direction of the first teeth is opposite to the tooth groove opening direction of the second teeth.

[0009] In one embodiment of the present invention, the first dielectric substrate and the second dielectric substrate are both strip-shaped plates arranged along the second direction; the first plate and the second plate are both provided in plurality, and the plurality of first plates and the plurality of second plates are staggered and connected in sequence; the first plate is a sawtooth structure, and the second plate includes a front plate portion, a middle plate portion and a rear plate portion parallel to each other, the first end of the front plate portion is connected to the previous first plate, the second end of the front plate portion is connected to the first end of the middle plate portion, the second end of the middle plate portion is connected to the first end of the rear plate portion, and the second end of the rear plate portion is connected to the next first plate; the front plate portion, the middle plate portion and the rear plate portion are all flat plate structures.

[0010] In one embodiment of the present invention, a first positioning groove and a second positioning groove are provided on the second dielectric substrate. The shape of the first positioning groove matches the shape of the first plate so that the first plate is snapped into the first positioning groove. The shape of the second positioning groove matches the shape of the second plate so that the second plate is snapped into the second positioning groove.

[0011] In one embodiment of the present invention, the bottom of the first plate is clamped in the first positioning groove, and the top of the first plate abuts against the surface of the first dielectric substrate facing the second dielectric substrate; the bottom of the second plate is clamped in the second positioning groove, and the top of the second plate abuts against the surface of the first dielectric substrate facing the second dielectric substrate.

[0012] In one embodiment of the present invention, a connection layer is further included. The connection layer is located between the first dielectric substrate and the second dielectric substrate. The connection layer is provided with a through hole for inserting the isolation plate.

[0013] In one embodiment of the present invention, the materials of the first dielectric substrate and the second dielectric substrate are flame-resistant materials, the thickness of the first dielectric substrate is 0.25mm-0.30mm, the thickness of the second dielectric substrate is 1.5mm-1.6mm, the spacing between the first dielectric substrate and the second dielectric substrate is 4.5mm-5.5mm, and the materials of the first metal patch layer, the second metal patch layer and the isolation plate are all copper.

[0014] In one embodiment of the present invention, it also includes a metal grounding layer and at least two coaxial feed lines. The metal grounding layer is arranged on a surface of the second dielectric substrate away from the first dielectric substrate. At least two through holes are arranged on the metal grounding layer. The at least two through holes correspond to the at least two second metal patches one by one. The at least two coaxial feed lines extend out through the at least two through holes and are connected to the second metal patches.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] In the above scheme of the present application, first, the phased array antenna structure includes a first dielectric substrate and a second dielectric substrate arranged opposite to each other, a first metal patch layer is provided on the surface of the first dielectric substrate facing the second dielectric substrate, and a second metal patch layer is provided on the surface of the second dielectric substrate facing the first dielectric substrate, and there is a gap between the first metal patch layer and the second metal patch layer. In this way, the second metal patch layer can be used as a radiation patch to generate electromagnetic waves, and the first metal patch layer can be used as a parasitic patch to improve the radiation performance of the second metal patch by coupling with the second metal patch. The first metal patch layer includes at least two first metal patches, and the second metal patch layer includes at least two second metal patches, and the at least two first metal patches correspond to the at least two second metal patches one by one. In this way, a first metal patch and a second metal patch can form an antenna subunit, and signal transmission is performed through at least two antenna subunits composed of at least two first metal patches and at least two second metal patches, which can improve the strength of signal transmission and reception in the phased array antenna structure, thereby improving the performance of the phased array antenna structure.

[0017] Secondly, the phased array antenna structure also includes an isolation plate, which is located between two adjacent first metal patches and between two adjacent second metal patches. In this way, the isolation plate can block the transmission of signals between the first metal patch in one antenna subunit and the first metal patch or the second metal patch in another antenna subunit, thereby increasing the attenuation loss of electromagnetic waves between two adjacent antenna subunits when they are transmitted in space, thereby avoiding mutual coupling between the two antenna subunits or weakening the mutual coupling between the two antenna subunits, reducing the interference between the two antenna subunits, and improving the isolation between the two antenna subunits, thereby improving the performance of signal transmission in the phased array antenna structure.

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an exploded schematic diagram of a phased array antenna structure provided by an embodiment of the present invention;

[0020] Figure 2 is a front view of a phased array antenna structure provided by an embodiment of the present invention;

[0021] Figure 3 is a schematic diagram of a first dielectric substrate in an embodiment of the present invention;

[0022] Figure 4 is a schematic diagram of a first dielectric substrate and a first metal patch layer in an embodiment of the present invention;

[0023] Figure 5 is a schematic diagram of a second dielectric substrate and a second metal patch layer in an embodiment of the present invention;

[0024] Figure 6 Schematic diagram of the metal grounding layer in the embodiment of the present invention Figure 1 ;

[0025] Figure 7 is a schematic diagram of a first dielectric substrate and an isolation plate in an embodiment of the present invention;

[0026] Figure 8 is a schematic diagram of a first plate of an isolation plate in an embodiment of the present invention;

[0027] Fig. 9 Schematic diagram of the metal grounding layer in the embodiment of the present invention Figure 2 ;

[0028] Fig.10 is a front view of a first dielectric substrate, a separation plate, and a second dielectric substrate in an embodiment of the present invention;

[0029] Fig.11 is a side view of a first dielectric substrate, a separation plate, and a second dielectric substrate in an embodiment of the present invention;

[0030] Fig.12 is a comparative schematic diagram of passive voltage standing wave ratio performance simulation in an embodiment of the present invention;

[0031] Fig.13 3 is a comparative schematic diagram of the active voltage standing wave ratio performance simulation in the embodiment of the present invention.

[0032] Figure numerals: 1-first dielectric substrate, 2-second dielectric substrate, 3-first metal patch layer, 31-first metal patch, 32-first gap, 33-second gap, 4-second metal patch layer, 41-second metal patch, 42-third gap, 44-fourth gap, 45-first positioning groove, 46-second positioning groove, 5-isolation plate, 51-first plate, 52-second plate, 6-connection layer, 7-metal grounding layer, 71-through hole. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0034] See also Figure 1 , Figure 2 , Fig.10 and Fig.11 An embodiment of the present invention provides a phased array antenna structure, comprising a first dielectric substrate 1 and a second dielectric substrate 2 arranged opposite to each other, a first metal patch layer 3 is provided on the surface of the first dielectric substrate 1 facing the second dielectric substrate 2, a second metal patch layer 4 is provided on the surface of the second dielectric substrate 2 facing the first dielectric substrate 1, and a gap exists between the first metal patch layer 3 and the second metal patch layer 4; the first metal patch layer 3 comprises at least two first metal patches 31, the second metal patch layer 4 comprises at least two second metal patches 41, and the at least two first metal patches 31 and the at least two second metal patches 41 correspond to each other one by one; the phased array antenna structure further comprises an isolation plate 5, the isolation plate 5 is located between two adjacent first metal patches 31, and between two adjacent second metal patches 41.

[0035] In some embodiments of the present application, the above-mentioned phased array antenna structure is applied to the C-band, which refers to an electromagnetic band with a frequency range between 4 GHz and 8 GHz, and has important applications in wireless communications, radar, satellite communications and other fields. Among them, since the wavelength of the C-band is relatively short, in the phased array antenna structure applied to the C-band, the interaction between the antenna subunits is more significant, the mutual coupling effect is stronger, and the interference effect between the antenna subunits is greater, which is more likely to affect the performance of the phased array antenna structure. In this way, when the above-mentioned phased array antenna structure of the present application is adopted, the isolation between the antenna subunits is improved by the isolation plate 5, and the mutual coupling effect between the antenna subunits is reduced, so that the phased array antenna structure has good communication when applied to the C-band.

[0036] In some embodiments of the present application, Figure 3 and Figure 4As shown, the first dielectric substrate 1 is a rectangular plate with a length of 102 mm and a width of 30 mm. The second dielectric substrate 2 is a rectangular plate with a length of 74 mm and a width of 30 mm. The phased array antenna structure has a length of 102 mm, a width of 30 mm, and a height of 6.824 mm.

[0037] In some embodiments of the present application, the materials of the first dielectric substrate 1 and the second dielectric substrate 2 are flame-resistant materials, which can improve the safety of the phased array antenna structure, wherein the relative dielectric constant of the first dielectric substrate 1 and the second dielectric substrate 2 is 3.66, and the electrical shear loss is 0.0037. The thickness of the first dielectric substrate 1 is 0.25mm-0.30mm, preferably 0.254mm. The thickness of the second dielectric substrate 2 is 1.5mm-1.6mm, preferably 1.57mm. The spacing between the first dielectric substrate 1 and the second dielectric substrate 2 is 4.5mm-5.5mm, preferably 5mm. In this way, the phased array antenna structure can be suitable for application scenarios of miniaturized antenna structures. The materials of the first metal patch layer 3, the second metal patch layer 4 and the isolation plate 5 are all copper. In this way, since copper has the advantages of good conductivity, high ductility, easy manufacturing and strong isolation, it is convenient for the production and processing of the isolation plate 5, and the isolation of the isolation plate 5 can be improved.

[0038] In some embodiments of the present application, an air cavity exists between the first dielectric substrate 1 and the second dielectric substrate 2 .

[0039] In some embodiments of the present application, a first metal patch 31 and a corresponding second metal patch 41 can constitute an antenna subunit, and at least two first metal patches 31 and corresponding at least two second metal patches 41 can respectively constitute at least two antenna subunits.

[0040] In the above scheme of the present application, first, the phased array antenna structure includes a first dielectric substrate 1 and a second dielectric substrate 2 that are arranged opposite to each other, a first metal patch layer 3 is provided on the surface of the first dielectric substrate 1 facing the second dielectric substrate 2, and a second metal patch layer 4 is provided on the surface of the second dielectric substrate 2 facing the first dielectric substrate 1, and there is a gap between the first metal patch layer 3 and the second metal patch layer 4. In this way, the second metal patch layer 4 can be used as a radiation patch to generate electromagnetic waves, and the first metal patch layer 3 can be used as a parasitic patch to improve the radiation performance of the second metal patch 41 by coupling with the second metal patch 41. The first metal patch layer 3 includes at least two first metal patches 31, and the second metal patch layer 4 includes at least two second metal patches 41, and the at least two first metal patches 31 and the at least two second metal patches 41 correspond one to one. In this way, a first metal patch 31 and a second metal patch 41 can form an antenna subunit, and signal transmission is performed through at least two antenna subunits composed of at least two first metal patches 31 and at least two second metal patches 41, which can improve the strength of signal sending and receiving in the phased array antenna structure, thereby improving the performance of the phased array antenna structure.

[0041] Secondly, the phased array antenna structure also includes an isolation plate 5, which is located between two adjacent first metal patches 31 and between two adjacent second metal patches 41. In this way, the isolation plate 5 can hinder the transmission of signals between the first metal patch 31 in one antenna subunit and the first metal patch 31 or the second metal patch 41 in another antenna subunit, increase the path length of electromagnetic wave diffraction, increase the attenuation loss of electromagnetic waves between two adjacent antenna subunits when they are transmitted in space, thereby avoiding mutual coupling between the two antenna subunits or weakening the mutual coupling between the two antenna subunits, reducing the interference between the two antenna subunits, and improving the isolation between the two antenna subunits, thereby improving the performance of signal transmission in the phased array antenna structure.

[0042] Table 1 below shows the test parameters of the phased array antenna structure without the isolation plate 5 and the phased array antenna structure with the isolation plate 5 when the radiation performance test is performed at 6 GHz.

[0043] Table 1:

[0044]

[0045] It can be seen from Table 1 that when the angles of the azimuth or elevation plane are (0, 0), (0, -35) and (-55, 0), the gain and 3dB beam width of the phased array antenna structure without adding a partition plate and the phased array antenna structure with adding a partition plate are not much different. Therefore, adding a partition plate does not affect the normal gain and radiation of the phased array antenna structure.

[0046] In some embodiments of the present application, Figure 4 and Figure 5 As shown, there are multiple first metal patches 31, and the multiple first metal patches 31 are distributed in an array, there is a first gap 32 between two adjacent first metal patches 31 along the first direction, and there is a second gap 33 between two adjacent first metal patches 31 along the second direction; there are multiple second metal patches 41, and the multiple second metal patches 41 are distributed in an array, there is a third gap 42 between two adjacent second metal patches 41 along the first direction, and there is a fourth gap 44 between two adjacent second metal patches 41 along the second direction; the first direction and the second direction are perpendicular to each other. In this way, signal transmission can be performed through the multiple first metal patches 31 distributed in an array, which can improve the strength of signal transmission and reception in the phased array antenna structure, thereby improving the performance of the phased array antenna structure.

[0047] In some embodiments of the present application, Figure 1 , Figure 4 and Figure 5 As shown, the first direction is direction x, and the second direction is direction y.

[0048] In some embodiments of the present application, Figure 7 and Figure 8As shown, the isolation plate 5 includes a first plate 51 and a second plate 52, the first plate 51 and the second plate 52 are fixedly connected, the first plate 51 is located in the first gap 32 and the third gap 42 at the same time, and the second plate 52 is located in the second gap 33 and the fourth gap 44 at the same time. In this way, when the first plate 51 is located in the first gap 32 and the third gap 42 at the same time, the first plate 51 can not only hinder the signal transmission between two adjacent first metal patches 31 in the first direction, avoid mutual coupling between the two first metal patches 31 or weaken the mutual coupling between the two first metal patches 31, improve the isolation between the two first metal patches 31, and thus improve the performance of signal transmission in the phased array antenna structure; it can also hinder the signal transmission between the first metal patch 31 of one antenna subunit and the second metal patch 41 of the other antenna subunit in two adjacent antenna subunits in the first direction, avoid mutual coupling between the two or weaken the mutual coupling between the two, thereby avoiding signal interference between the two antenna subunits and affecting the performance of the phased array antenna structure. When the second plate 52 is located in the second gap 33 and the fourth gap 44 at the same time, the second plate 52 can not only hinder the signal transmission between two adjacent first metal patches 31 in the second direction, avoid mutual coupling between the two first metal patches 31 or weaken the mutual coupling between the two first metal patches 31, improve the isolation between the two first metal patches 31, and thus improve the signal transmission performance in the phased array antenna structure; it can also hinder the signal transmission between the first metal patch 31 of one antenna subunit and the second metal patch 41 of the other antenna subunit in two adjacent antenna subunits in the second direction, avoid mutual coupling between the two or weaken the mutual coupling between the two, thereby avoiding signal interference between the two antenna subunits and affecting the performance of the phased array antenna structure.

[0049] In some embodiments of the present application, the first plate 51 and / or the second plate 52 is a sawtooth structure, and the sawtooth structure includes a plurality of staggered first teeth and second teeth, and the tooth slot opening direction of the first tooth is opposite to the tooth slot opening direction of the second tooth. In this way, when the first plate 51 and / or the second plate 52 is a sawtooth structure, the sawtooth structure has tooth slots, and when the electromagnetic wave is transmitted into the tooth slot, it will touch the groove walls of the tooth slot and reflect in multiple directions. The electromagnetic waves after emission will collide with each other and offset attenuation, thereby increasing the attenuation loss of the electromagnetic wave between two adjacent antenna subunits when transmitting in space, avoiding mutual coupling between the two antenna subunits or weakening the mutual coupling between the two antenna subunits, reducing the interference between the two antenna subunits, and improving the isolation between the two antenna subunits, thereby improving the overall radiation efficiency of the phased array antenna structure. In addition, the sawtooth structure can also increase the strength of the isolation plate 5, so that the overall stability of the phased array antenna structure is higher. The first tooth and the second tooth are staggered and when the tooth slot opening direction of the first tooth is opposite to the tooth slot opening direction of the second tooth, the electromagnetic waves emitted by two adjacent antenna sub-units can be suppressed and attenuated by the first tooth and the second tooth respectively, thereby further reducing the interference between the two antenna sub-units and improving the isolation between the two antenna sub-units.

[0050] In some embodiments of the present application, both the first tooth and the second tooth are rectangular teeth.

[0051] In some embodiments of the present application, the first dielectric substrate 1 and the second dielectric substrate 2 are both strip plates arranged along the second direction; the first plate 51 and the second plate 52 are both provided in plurality, and the plurality of first plates 51 and the plurality of second plates 52 are staggered and connected in sequence; the first plate 51 is a sawtooth structure, and the second plate 52 includes a front plate portion, a middle plate portion, and a rear plate portion parallel to each other, the first end of the front plate portion is connected to the previous first plate 51, the second end of the front plate portion is connected to the first end of the middle plate portion, the second end of the middle plate portion is connected to the first end of the rear plate portion, and the second end of the rear plate portion is connected to the next first plate 51; the front plate portion, the middle plate portion, and the rear plate portion are all flat plate structures. In this way, when the first dielectric substrate 1 and the second dielectric substrate 2 are both strip plates arranged along the second direction, the distribution space of the first metal patch 31 and the second metal patch 41 is larger along the length direction of the strip plate, and the distribution space of the first metal patch 31 and the second metal patch 41 is smaller along the width direction of the strip plate. Therefore, the width of the second gap 33 can be greater than the width of the first gap 32, and the width of the fourth gap 44 can be greater than the width of the third gap 42, so that the interference between the two adjacent first metal patches 31 along the second direction is weaker, and the interference between the two adjacent first metal patches 31 along the first direction is stronger. When the first plate 51 is a sawtooth structure, and the second plate 52 includes a front plate portion, a middle plate portion, and a rear plate portion that are parallel to each other, the sawtooth structure has a better effect of blocking electromagnetic waves and can reduce the interference between the two adjacent first metal patches 31 along the first direction. When the front plate portion, the middle plate portion, and the rear plate portion are all flat plate structures, they can not only block the propagation of electromagnetic waves and reduce the interference between the two adjacent first metal patches 31 along the second direction, but also make the production and processing of the second plate 52 more convenient.

[0052] In some embodiments of the present application, the first metal patches 31 are distributed in an array of two rows and six columns, and the second metal patches 41 are also distributed in an array of two rows and six columns.

[0053] In some embodiments of the present application, Figure 5 As shown, the second dielectric substrate 2 is provided with a first positioning groove 45 and a second positioning groove 46, the shape of the first positioning groove 45 matches the shape of the first plate 51, so that the first plate 51 is clamped in the first positioning groove 45, and the shape of the second positioning groove 46 matches the shape of the second plate 52, so that the second plate 52 is clamped in the second positioning groove 46. In this way, the first plate 51 and the second plate 52 of the isolation plate 5 are positioned by the first positioning groove 45 and the second positioning groove 46, so that the installation accuracy and stability of the isolation plate 5 can be improved.

[0054] In some embodiments of the present application, Figure 7As shown, the bottom of the first plate 51 is clamped in the first positioning groove 45, and the top of the first plate 51 abuts against the surface of the first dielectric substrate 1 facing the second dielectric substrate 2; the bottom of the second plate 52 is clamped in the second positioning groove 46, and the top of the second plate 52 abuts against the surface of the first dielectric substrate 1 facing the second dielectric substrate 2. In this way, when there is a gap between the top of the first plate 51 and the first dielectric substrate 1, the gap can form a propagation channel for electromagnetic waves and cause interference between the two antenna sub-units; and when there is a gap between the top of the second plate 52 and the first dielectric substrate 1, the gap can form a propagation channel for electromagnetic waves and cause interference between the two antenna sub-units, thereby further improving the performance of the phased array antenna structure.

[0055] In some embodiments of the present application, Figure 1 and Figure 2 As shown, the phased array antenna structure further includes a connection layer 6, which is located between the first dielectric substrate 1 and the second dielectric substrate 2, and the connection layer 6 is provided with a through hole for inserting the isolation plate 5. In this way, the first dielectric substrate 1, the second dielectric substrate 2 and the isolation plate 5 are positioned by the connection layer 6, which can improve the overall stability of the phased array antenna.

[0056] In some embodiments of the present application, Figure 1 , Figure 6 and Fig. 9 As shown, the phased array antenna structure further includes a metal grounding layer 7 and at least two coaxial feed lines. The metal grounding layer 7 is disposed on the surface of the second dielectric substrate 2 away from the first dielectric substrate 1. At least two through holes 71 are disposed on the metal grounding layer 7. The at least two through holes 71 correspond to the at least two second metal patches 41 one by one. The at least two coaxial feed lines extend out through the at least two through holes 71 and are connected to the second metal patches 41. In this way, grounding can be performed through the metal grounding layer 7, and power can be fed to the first metal patches 31 through the coaxial feed lines, thereby ensuring that the phased array antenna structure can work normally.

[0057] In some embodiments of the present application, Fig. 9 As shown, the metal grounding layer 7 may also be provided with a groove for positioning the isolation plate 5, and the shape of the groove is the same as the cross-sectional shape of the isolation plate 5. At this time, the second dielectric substrate 2 is provided with a through hole, and the isolation plate 5 extends through the through hole on the second dielectric substrate 2 to the groove on the metal grounding layer 7.

[0058] In some embodiments of the present application, the inner diameter of the coaxial feed line may be 0.5 mm, and the outer diameter may be 2.8 mm. The material of the coaxial feed line may be FR-4 flame-resistant material to meet the impedance matching of 50 ohms.

[0059] In some embodiments of the present application, the material of the metal grounding layer 7 may be copper.

[0060] Table 2 below shows specific parameters of the phased array antenna structure in an embodiment of the present application.

[0061] Table 2:

[0062] parameter <![CDATA[h 1 ]]> <![CDATA[h 2 ]]> <![CDATA[h 3 ]]> <![CDATA[h 4 ]]> <![CDATA[D 1 ]]> <![CDATA[D 2 ]]> <![CDATA[D 3 ]]> <![CDATA[D 4 ]]> <![CDATA[d 1 ]]> <![CDATA[d 2 ]]> Value / mm 0.254 5 1.57 6.57 102 30 74 30 1.2 23.5 parameter <![CDATA[d 3 ]]> <![CDATA[d 4 ]]> <![CDATA[d 5 ]]> <![CDATA[d 6 ]]> <![CDATA[d 7 ]]> <![CDATA[d 8 ]]> <![CDATA[d 9 ]]> <![CDATA[d x ]]> <![CDATA[d y ]]> <![CDATA[l 1 ]]> Value / mm 1.7 9.5 2.95 1.2 0.5 0.8 0.4 15 22 11 parameter <![CDATA[l 2 ]]> <![CDATA[l 3 ]]> <![CDATA[l 4 ]]> <![CDATA[w 1 ]]> <![CDATA[w 2 ]]> <![CDATA[w 3 ]]> <![CDATA[r 2 ]]> Value / mm 11 15 12.9 12.4 11.4 0.2 1.4

[0063] Among them, h 1 is the thickness of the first dielectric substrate 1, h 2 is the distance between the first dielectric substrate 1 and the second dielectric substrate 2, h 3 is the thickness of the second dielectric substrate 2, h 4 h 2 and h 3 The sum of. 1 is the length of the first dielectric substrate 1, D 2 is the width of the first dielectric substrate 1. Figure 4 , d 1 is the distance between the first metal patch 31 and the edge of the first dielectric substrate 1 in the first direction, d 2 is the distance between the first metal patch 31 and the edge of the first dielectric substrate 1 in the second direction, l 1 is the length of the first metal patch 31, w 1 is the width of the first metal patch 31. Figure 5 , d 3 is the distance between the second metal patch 41 and the edge of the second dielectric substrate 2 in the first direction, d 4 is the distance between the second metal patch 41 and the edge of the second dielectric substrate 2 in the second direction, l 2 is the length of the first metal patch 31, w 2 is the width of the first metal patch 31. 3 is the length of the second dielectric substrate 2, D 4 is the width of the second dielectric substrate 2. Figure 6 , r 2 is the radius of the through hole 71 in the metal ground layer 7, d x is the pitch distance of the first metal patch 31, d y is the azimuth spacing of the first metal patch 31. Figure 7 , d 5 is the opening width of the groove in the first plate 51 of the isolation plate 5, d 6 is the distance between the front plate portion and the middle plate portion in the second plate 52, l 3 is the distance between the front plate portion of the second plate 52 and the connection point of the first plate 51 and the edge of the first dielectric substrate 1 in the first direction, l 4 is the length of the front plate portion of the second plate 52. Figure 8 , d7 is the height of the left end of the first tooth in the first plate 51, d 8 is the height of the right end of the first tooth in the first plate 51, d 9 is the height of the rightmost end of the first plate 51, w 3 is the thickness of the first plate 51 .

[0064] In some embodiments of the present application, Fig.12 A comparative schematic diagram of the passive voltage standing wave ratio performance simulation of the phased array antenna structure is shown. Among them, the six gray lines represent the passive voltage standing wave ratios of the six first metal patches 31 in the phased array antenna structure without the isolation plate 5, and the average value is 2.87. The six black lines represent the passive voltage standing wave ratios of the six first metal patches 31 in the phased array antenna structure with the isolation plate 5, and the average value is 1.58. Among them, the voltage standing wave ratio (VSWR) refers to the ratio of the voltage between the antinode voltage and the trough voltage amplitude of the transmission line. The voltage standing wave ratio can reflect the isolation of the antenna. The smaller the voltage standing wave ratio, the better the isolation of the antenna. By Fig.12 It can be seen that the average value of the passive voltage standing wave ratio of the phased array antenna structure with the isolation plate 5 is smaller than the average value of the passive voltage standing wave ratio of the phased array antenna structure without the isolation plate 5. Therefore, the passive isolation of the phased array antenna structure with the isolation plate 5 is significantly improved.

[0065] In some embodiments of the present application, Fig.13 A comparative schematic diagram of the active voltage standing wave ratio performance simulation of the phased array antenna structure is shown. Specifically, the phased array antenna structure is applied to 6GHZ, and the phased array antenna port adopts an amplitude and phase with a pitch angle of 0° and a normal angle of -35°. Among them, the six gray lines represent the active voltage standing wave ratios of the six first metal patches 31 in the phased array antenna structure without the isolation plate 5, and the average value is 4.36. The six black lines represent the active voltage standing wave ratios of the six first metal patches 31 in the phased array antenna structure with the isolation plate 5, and the average value is 1.80. By Fig.13 It can be seen that the average active voltage standing wave ratio of the phased array antenna structure with the isolation plate 5 is smaller than the average active voltage standing wave ratio of the phased array antenna structure without the isolation plate 5. Therefore, the active isolation of the phased array antenna structure with the isolation plate 5 is significantly improved.

[0066] Table 3 below shows the average values ​​of the voltage standing wave ratios of the phased array antenna structure without the isolation plate 5 and the phased array antenna structure with the isolation plate 5 at passive, (0, 0), (0, -35) and (-30, 0).

[0067]

[0068] It can be seen from Table 3 that when passive, (0, 0), (0, -35) and (-30, 0), the average value of the voltage standing wave ratio of the phased array antenna structure without adding the isolation plate 5 is greater than the average value of the voltage standing wave ratio of the phased array antenna structure with the isolation plate 5. Therefore, the isolation of the phased array antenna structure with the isolation plate 5 is significantly improved. Furthermore, when the phased array antenna structure in the embodiment of the present application is adopted, the isolation of the phased array antenna structure can be improved without affecting the radiation performance of the antenna.

[0069] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0070] In addition, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", "third", and "fourth" may explicitly or implicitly include one or more of the feature. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0071] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0072] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A phased array antenna structure, characterized in that: It comprises a first dielectric substrate and a second dielectric substrate which are arranged opposite to each other, wherein a first metal patch layer is provided on a surface of the first dielectric substrate facing the second dielectric substrate, and a second metal patch layer is provided on a surface of the second dielectric substrate facing the first dielectric substrate, and there is a gap between the first metal patch layer and the second metal patch layer; The first metal patch layer includes at least two first metal patches, the second metal patch layer includes at least two second metal patches, and the at least two first metal patches and the at least two second metal patches correspond to each other one by one; The phased array antenna structure also includes an isolation plate, which is located between two adjacent first metal patches and between two adjacent second metal patches.

2. The phased array antenna structure according to claim 1, characterized in that: There are a plurality of first metal patches, and the plurality of first metal patches are distributed in an array, a first gap exists between two adjacent first metal patches along a first direction, and a second gap exists between two adjacent first metal patches along a second direction; There are a plurality of second metal patches, and the plurality of second metal patches are distributed in an array, a third gap exists between two adjacent second metal patches along the first direction, and a fourth gap exists between two adjacent second metal patches along the second direction; The first direction and the second direction are perpendicular to each other.

3. The phased array antenna structure according to claim 2, characterized in that: The isolation plate includes a first plate and a second plate, the first plate and the second plate are fixedly connected, the first plate is located in the first gap and the third gap at the same time, and the second plate is located in the second gap and the fourth gap at the same time.

4. The phased array antenna structure according to claim 3, characterized in that: The first plate and / or the second plate is a sawtooth structure, and the sawtooth structure includes a plurality of first teeth and second teeth that are staggered and distributed, and the tooth groove opening direction of the first teeth is opposite to the tooth groove opening direction of the second teeth.

5. The phased array antenna structure according to claim 4, characterized in that: The first dielectric substrate and the second dielectric substrate are both strip plates arranged along the second direction; There are multiple first plates and multiple second plates, and the multiple first plates and multiple second plates are staggered and connected in sequence; The first plate is a sawtooth structure, the second plate includes a front plate portion, a middle plate portion and a rear plate portion which are parallel to each other, the first end of the front plate portion is connected to the first plate before, the second end of the front plate portion is connected to the first end of the middle plate portion, the second end of the middle plate portion is connected to the first end of the rear plate portion, and the second end of the rear plate portion is connected to the second first plate; The front plate portion, the middle plate portion and the rear plate portion are all flat plate structures.

6. The phased array antenna structure according to claim 3, characterized in that: The second dielectric substrate is provided with a first positioning groove and a second positioning groove. The shape of the first positioning groove matches the shape of the first plate so that the first plate is clamped in the first positioning groove. The shape of the second positioning groove matches the shape of the second plate so that the second plate is clamped in the second positioning groove.

7. The phased array antenna structure according to claim 6, characterized in that: The bottom of the first plate is clamped in the first positioning groove, and the top of the first plate abuts against the surface of the first dielectric substrate facing the second dielectric substrate; The bottom of the second plate is clamped in the second positioning groove, and the top of the second plate abuts against the surface of the first dielectric substrate facing the second dielectric substrate.

8. The phased array antenna structure according to claim 1, characterized in that: It also includes a connection layer, which is located between the first dielectric substrate and the second dielectric substrate, and is provided with a through hole for inserting the isolation plate.

9. The phased array antenna structure according to claim 1, characterized in that: The materials of the first dielectric substrate and the second dielectric substrate are flame-resistant materials, the thickness of the first dielectric substrate is 0.25mm-0.30mm, the thickness of the second dielectric substrate is 1.5mm-1.6mm, the distance between the first dielectric substrate and the second dielectric substrate is 4.5mm-5.5mm, and the materials of the first metal patch layer, the second metal patch layer and the isolation plate are all copper.

10. The phased array antenna structure according to claim 1, characterized in that: It also includes a metal grounding layer and at least two coaxial feed lines. The metal grounding layer is arranged on the surface of the second dielectric substrate away from the first dielectric substrate. The metal grounding layer is provided with at least two through holes. The at least two through holes correspond to at least two second metal patches one by one. The at least two coaxial feed lines extend out through the at least two through holes and are connected to the second metal patches.

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