Dual frequency navigation glass antenna and communication system

Abstract

The application provides a dual-frequency navigation glass antenna and a communication system, which comprises a composite glass substrate, a ground plane provided with a transmission channel, a microstrip feed line corresponding to the transmission channel, and a radiation mechanism with an included angle between the length direction and the first direction within a preset range, the radiation mechanism comprising two low-frequency patches and two high-frequency patches, the high-frequency patches and the low-frequency patches being staggered and arranged in a center-symmetrical structure, the low-frequency patches being provided with parallel grooves and orthogonal grooves arranged perpendicularly to each other, and the extension direction of the adjusting grooves being parallel to the extension direction of the orthogonal grooves. The application solves the defects of narrow bandwidth, large gain fluctuation and weak signal reception in part of the frequency band of the traditional navigation antenna, and realizes the synergistic optimization of the dual-frequency performance, the integrated reliability and the signal reception quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication, and particularly relates to a dual-frequency navigation glass antenna and a communication system. BACKGROUND

[0002] In the field of automobile wireless communication and navigation positioning, the satellite navigation antenna as a core receiving component directly affects the navigation accuracy and communication stability of the whole vehicle. In the traditional automobile satellite navigation antenna, the shark fin antenna placed outside the vehicle is widely used, but such an external antenna is easily eroded and affected by external environmental factors such as rain, sand and collision, which not only reduces the service life and working stability of the antenna, but also damages the coordination of the overall appearance of the vehicle, and is difficult to meet the needs of some users for the appearance of the vehicle. At the same time, with the improvement of the intelligent level of the vehicle, the number of wireless communication antennas to be carried on the vehicle increases year by year, and when multiple antennas are densely arranged in the limited vehicle body space, mutual coupling interference between the antennas is easily caused, which leads to the decrease of the signal receiving sensitivity of each wireless communication system and the weakening of the anti-interference ability, and further affects the overall performance of the navigation positioning and other communication functions. In addition, these multiple independent antennas need to be equipped with separate mounting structures, connection cables and connectors, which not only increases the part cost of the whole vehicle, but also makes the antenna mounting process more complex, prolongs the vehicle production cycle, and increases the assembly difficulty and the maintenance cost.

[0003] To solve the defects of the external antenna, the traditional patch satellite navigation antenna is gradually applied, but it has the inherent problem of narrow frequency band coverage. With the continuous improvement of the demand for automatic driving, high-precision positioning and navigation, higher requirements are put forward for the frequency band coverage and positioning accuracy of the satellite navigation antenna. The traditional patch antenna cannot realize wide frequency band coverage and cannot meet the use demand of high-precision navigation and positioning function, which limits its application in high-end intelligent vehicles.

[0004] At present, in order to widen the antenna bandwidth and realize the multi-frequency band working performance, the industry often uses a multi-layer patch structure to design the antenna. Although such a structure can improve the frequency band coverage problem to some extent, it also brings new technical problems: the multi-layer patch structure will significantly increase the profile height of the antenna, which is difficult to adapt to the installation demand of the antenna miniaturization and flattening of the automobile body and interior decoration; and the multi-layer patch antenna usually needs to use a coaxial feeding method, which needs to punch holes on the antenna dielectric plate. If such an antenna is installed on the automobile glass, the punching operation will damage the structural integrity and mechanical stability of the glass, increase the risk of glass cracking and damage, and affect the safety of the whole vehicle. SUMMARY

[0005] To this end, the technical problem to be solved by the present application is to overcome the problems of narrow bandwidth, large gain fluctuation and weak signal reception in some frequency bands in the prior art, and to provide a dual-frequency navigation glass antenna and a communication system.

[0006] To solve the above technical problems, the present application provides a dual-frequency navigation glass antenna, comprising: a composite glass substrate, the composite glass substrate comprising a top substrate, a bottom substrate and an adhesive layer connected between the top substrate and the bottom substrate; a ground plane provided between the adhesive layer and the bottom substrate, and provided with a transmission channel penetrating through the thickness direction thereof; a microstrip feed line provided on the outer surface of the bottom substrate and corresponding to the transmission channel; a radiation mechanism provided on the outer surface of the top substrate, and the included angle between the length direction of the radiation mechanism and the first direction is within a preset range, the radiation mechanism comprising two low-frequency patches and two high-frequency patches, the high-frequency patches and the low-frequency patches are staggered arranged, and are spaced apart in a central symmetric structure with the center of the top substrate as the symmetric point in the plane of the top substrate, wherein the parallel groove segment and the orthogonal groove segment are provided on any low-frequency patch, the parallel groove segment and the orthogonal groove segment are arranged perpendicular to each other in the plane of the top substrate, the parallel groove segment extends along the length direction of the low-frequency patch, and the adjusting groove is provided on any high-frequency patch, and the extension direction of the adjusting groove is parallel to the extension direction of the orthogonal groove segment.

[0007] In an embodiment of the present application, the preset range is 30-40°.

[0008] In an embodiment of the present application, the orthogonal groove segment extends from one side of the low-frequency patch close to the center of the top substrate to the inside thereof, the length of the orthogonal groove segment is greater than the length of the parallel groove segment, and the width of the orthogonal groove segment is greater than the width of the parallel groove segment.

[0009] In an embodiment of the present application, in the length direction of the orthogonal groove segment, the parallel groove segment is arranged deviated from the extension end of the orthogonal groove segment, and the parallel groove segment is arranged in a symmetrical structure on both sides of the width direction of the corresponding orthogonal groove segment.

[0010] In an embodiment of the present application, the radiation mechanism further comprises two extension patches, the two extension patches are respectively connected to one side of the low-frequency patch close to the edge of the top substrate, and extend from one side of the low-frequency patch close to the center of the top substrate to the other side of the length direction of the low-frequency patch, the length of the extension patch is less than the length of the low-frequency patch, and the width of the extension patch is less than the width of the low-frequency patch.

[0011] In an embodiment of the present application, the adjusting groove extends from the side of the high-frequency patch close to the center of the top substrate to the inside of the high-frequency patch, the extension length of the adjusting groove is less than the length of the orthogonal groove segment, and the width of the adjusting groove is greater than the width of the orthogonal groove segment.

[0012] In an embodiment of the present application, in the length direction of the radiation mechanism, the distance between the adjusting groove and the center of the top substrate is less than the distance between the orthogonal groove segment and the center of the top substrate.

[0013] In an embodiment of the present application, the microstrip feed line extends along the second direction, and the line width of the end close to the center of the bottom substrate is greater than the line width of the end away from the center of the bottom substrate.

[0014] In an embodiment of the present application, the transmission channel is arranged in the middle of the ground plane and is configured as a rectangular slot extending along the first direction, and the extension length of the transmission channel is 1 / 4 wavelength corresponding to the center frequency.

[0015] The present application also provides a dual-frequency navigation communication system comprising the dual-frequency navigation glass antenna.

[0016] The above technical solutions of the present application have the following advantages compared with the prior art:

[0017] The dual-frequency navigation glass antenna and the communication system provided by the present application use a composite glass substrate as a carrier, integrate the ground plane between the adhesive layer inside the substrate and the bottom substrate, integrate the microstrip feed line on the outer surface of the bottom substrate, and arrange the radiation mechanism on the outer surface of the top substrate, without occupying additional vehicle-mounted installation space, and have the advantages of concealment and aesthetics. Meanwhile, the sandwich structure of the composite glass substrate can reliably protect the internal feed structure from the influence of external environments such as vibration, rain and snow, ultraviolet rays, and the like, and greatly improves the service life and working stability of the antenna under complex vehicle-mounted working conditions. By arranging the two low-frequency patches and the two high-frequency patches in a central symmetric and staggered manner with the center of the top substrate as the symmetric point, cooperating with the parallel groove segment and the orthogonal groove segment arranged vertically on the low-frequency patch, and the adjusting groove of the high-frequency patch extending in parallel with the direction of the orthogonal groove segment, the resonant modes of the high-frequency and low-frequency target frequency bands that meet the orthogonal and equal amplitude can be excited respectively, stable circularly polarized radiation is realized, the anti-interference ability and positioning accuracy of the navigation signal reception are effectively improved, and the problems of poor adaptability of the traditional single-frequency antenna and unstable polarization performance of the multi-frequency antenna are solved.

[0018] Meanwhile, the transmission channels on the ground plane are correspondingly arranged with the microstrip feed lines, which can effectively penetrate the electromagnetic shielding of the ground plane, build an efficient energy coupling path, and ensure the accurate transmission of the feeding energy to the radiation mechanism. The symmetrical layout of the radiation mechanism and the collaborative design of the slot structure can effectively introduce degenerate modes, broaden the effective bandwidth of the high and low frequency bands, improve the gain consistency of the antenna in the target frequency band, and avoid the occurrence of signal reception blind area. Thus, the high-precision navigation scene can be effectively adapted, and the defects of narrow bandwidth, large gain fluctuation, and weak signal reception in some frequency bands of the traditional navigation antenna are solved, and the collaborative optimization of dual-frequency performance, integrated reliability, and signal reception quality is realized as a whole. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to make the content of the present application easier to be clearly understood, the present application will be further described in detail below according to specific embodiments of the present application and in conjunction with the drawings.

[0020] Figure 1 is an exploded structural schematic diagram of a dual-frequency navigation glass antenna in a preferred embodiment of the present application;

[0021] Figure 2 is a layer structure schematic diagram of a composite glass substrate in a dual-frequency navigation glass antenna in a preferred embodiment of the present application;

[0022] Figure 3 is a structural schematic diagram of a radiation mechanism and a top substrate of a dual-frequency navigation glass antenna in a preferred embodiment of the present application;

[0023] Figure 4 is a simulation diagram of the relationship between the reflection coefficient and the frequency of a dual-frequency navigation glass antenna in a preferred embodiment of the present application;

[0024] Figure 5 is a diagram of the relationship between the axial ratio and the frequency of a dual-frequency navigation glass antenna in a preferred embodiment of the present application;

[0025] Figure 6 is a two-dimensional radiation pattern of a dual-frequency navigation glass antenna at 1.268 GHz in a preferred embodiment of the present application;

[0026] Figure 7 is a two-dimensional radiation pattern of a dual-frequency navigation glass antenna at 1.575 GHz in a preferred embodiment of the present application.

[0027] DESCRIPTION OF DRAWINGS: 100, composite glass substrate; 110, top substrate; 120, adhesive layer; 130, bottom substrate; 200, ground plane; 210, transmission channel; 300, microstrip feed line; 400, radiation mechanism; 410, low-frequency patch; 411, parallel slot segment; 412, orthogonal slot segment; 420, high-frequency patch; 421, adjusting slot; 430, extended patch; X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0028] The present application will be further described with reference to the drawings and specific examples, so that those skilled in the art can better understand the present application and implement it.

[0029] Embodiment one: refer to Figures 1 to 3 As shown in the figure, the embodiment provides a dual-frequency navigation glass antenna, which comprises: a composite glass substrate 100, the composite glass substrate 100 comprises a top substrate 110, a bottom substrate 130 and an adhesive layer 120 connected between the top substrate 110 and the bottom substrate 130; a ground plane 200 is arranged between the adhesive layer 120 and the bottom substrate 130, and a transmission channel 210 penetrating through the thickness direction thereof is arranged thereon; a microstrip feed line 300 is arranged on the outer surface of the bottom substrate 130 and corresponds to the transmission channel 210; a radiation mechanism 400 is arranged on the outer surface of the top substrate 110, and the included angle between the length direction of the radiation mechanism 400 and the first direction X is within a preset range, the radiation mechanism 400 comprises two low-frequency patches 410 and two high-frequency patches 420, the high-frequency patches 420 and the low-frequency patches 410 are staggered arranged, and are arranged in a central symmetric structure with the center of the top substrate 110 as the symmetric point in the plane of the top substrate 110, and parallel groove sections 411 and orthogonal groove sections 412 are arranged on any low-frequency patch 410, the parallel groove sections 411 extend along the length direction of the low-frequency patch 410, and any high-frequency patch 420 is provided with an adjusting groove 421, and the extension direction of the adjusting groove 421 is parallel to the extension direction of the orthogonal groove section 412.

[0030] It should be noted that, for the convenience of description, the length direction of the composite glass substrate 100 shown in the embodiment is defined as the first direction X, the width direction of the composite glass substrate 100 is defined as the second direction Y, and the thickness direction of the composite glass substrate 100 is defined as the third direction Z, wherein the first direction X, the second direction Y and the third direction Z are arranged vertically to each other in pairs, and the first direction X and the second direction Y are located in the same plane. Figure 1

[0031] ​The composite glass substrate 100 serves as a bearing matrix of the antenna, and is composed of a top substrate 110, a bottom substrate 130 and an adhesive layer 120 to form a sandwich structure, which not only provides stable mounting support for the ground plane 200, the microstrip feed line 300 and the radiation mechanism 400, but also hides the ground plane 200 inside the substrate through the sandwich design, realizes the integration of the antenna and the application scene such as vehicle-mounted glass, has concealment and structural strength, and can protect the internal feed structure from external vibration, rain, snow and ultraviolet radiation, and ensure the service life of the antenna under complex working conditions.

[0032] Specifically, the glass dielectric constant of the top substrate 110 and the bottom substrate 130 in the embodiment is 7, the loss tangent angle is 0.01, and the thickness is 2.1 mm. The parameter design can guarantee the electromagnetic signal transmission efficiency of the antenna in the target double frequency band, reduce the influence of dielectric loss on the radiation performance, and provide a stable and reliable mounting carrier for the ground plane 200, the microstrip feed line 300 and the radiation mechanism 400, meeting the requirements of the substrate structural strength and weather resistance in the vehicle-mounted scene. The adhesive layer 120 is preferably a PVB glue layer with a dielectric constant of 2.96, a loss angle tangent of 0.06 and a thickness of 0.76 mm. The PVB glue layer not only can realize the firm bonding of the top substrate 110 and the bottom substrate 130 to form an integrated sandwich glass structure, but also can match the electromagnetic characteristics of the glass substrate, reduce the signal reflection between different medium layers, guarantee the energy coupling stability between the feed system and the radiation mechanism 400, and has good buffering and protection performance, improving the use reliability of the antenna under complex working conditions such as vibration and impact.

[0033] In the embodiment, the ground plane 200 is arranged between the adhesive layer 120 and the bottom substrate 130, which can shield the electromagnetic interference on the side of the bottom substrate 130 and avoid the influence of external clutter on the feed signal. On the other hand, the transmission channel 210 penetrating the thickness direction of the ground plane 200 can break through the electromagnetic shielding effect of the ground plane 200, build an energy transmission path between the microstrip feed line 300 and the top radiation mechanism 400, and ensure that the feed energy can be accurately coupled to the radiation mechanism 400 to excite resonance.

[0034] Further, the transmission channel 210 is arranged in the middle of the ground plane 200 and is configured as a rectangular slot extending along the first direction X, and the extension length of the transmission channel 210 is 1 / 4 wavelength corresponding to the center resonant frequency 1.4 GHz. This design can make the transmission channel 210 produce a resonant effect at a frequency of 1.4 GHz, thereby breaking through the electromagnetic shielding effect of the ground plane 200 and building an efficient energy coupling path between the microstrip feed line 300 and the top radiation mechanism 400, ensuring that the radio frequency energy transmitted by the microstrip feed line 300 can be accurately and low-loss coupled to the radiation mechanism 400, thereby exciting the high-low frequency patch to produce a stable resonant mode, and providing key energy transmission protection for the antenna to realize dual-frequency circularly polarized radiation.

[0035] In this embodiment, the microstrip feed line 300 is arranged on the outer surface of the bottom substrate 130 and accurately corresponds to the transmission channel 210. Its core function is to transmit externally input radio frequency signals and couple electromagnetic energy to the top radiation mechanism 400 through the transmission channel 210, and it is a core component for realizing antenna feeding. Subsequently, the impedance matching can be further optimized by gradually changing the line width design, the energy transmission efficiency can be improved, and signal loss can be reduced.

[0036] Further, the microstrip feed line 300 in this embodiment is configured as a gradually changing microstrip feed line, which extends along the second direction Y, and the line width of the end close to the center of the bottom substrate 130 is greater than the line width of the end away from the center of the bottom substrate 130. This gradually changing line width design can optimize the impedance matching performance of the feed line, reduce the reflection loss of the radio frequency signal during transmission, and at the same time form an accurate spatial correspondence relationship with the rectangular transmission channel 210 extending along the first direction X in the middle of the ground plane 200, ensuring that the electromagnetic energy transmitted by the feed line can be efficiently concentrated and coupled to the top radiation mechanism 400 through the transmission channel 210, providing continuous and stable energy input for the stable excitation of the high-low frequency patch resonant mode.

[0037] In this embodiment, the radiation mechanism 400 realizes the core function of signal receiving and radiation as an antenna, is arranged on the outer surface of the top substrate 110 to maximize the contact with the navigation signal in space, and a preset included angle with the first direction X can optimize the current distribution of the patch to adapt to the circularly polarized radiation requirement. The two low-frequency patches 410 and the two high-frequency patches 420 are arranged in a structure of central symmetry and staggered arrangement with the center of the top substrate 110 as the symmetric point, which can ensure the symmetry of the current distribution of the high-frequency and low-frequency patches, and avoid electromagnetic interference between the high-frequency and low-frequency frequency bands. The mutually perpendicular parallel groove sections 411 and the orthogonal groove sections 412 on the low-frequency patch 410 can effectively introduce degenerate modes, widen the low-frequency working bandwidth, and construct orthogonal resonance modes meeting the circular polarization requirement. The adjustment groove 421 on the high-frequency patch 420 is parallel to the extension direction of the orthogonal groove section 412, which can adapt to the current path distribution of the high-frequency band, ensure the stability of the circular polarization performance of the high-frequency band, and realize efficient reception of the dual-frequency navigation signal.

[0038] Specifically, as shown in Figure 3 The preset range in this embodiment is 35°, and in different embodiments, the preset range can be configured to 30-40° according to actual use requirements. The limitation of the angle range can adapt to the central symmetric staggered arrangement of the high-frequency and low-frequency patches in the radiation mechanism 400, optimize the current distribution state on the patch surface, make the high-frequency and low-frequency patches form resonance modes meeting the requirements of orthogonality, equal amplitude, and phase difference of 90° in the target frequency band, effectively avoid electromagnetic interference between the high-frequency and low-frequency frequency bands, ensure the stability of the antenna dual-frequency circularly polarized radiation performance, and lay a structural foundation for improving the anti-interference ability and positioning accuracy of the navigation signal reception.

[0039] The orthogonal groove section 412 in this embodiment extends from one side of the low-frequency patch 410 close to the center of the top substrate 110 to the inside. The length of the orthogonal groove section 412 is greater than the length of the parallel groove section 411, and the width of the orthogonal groove section 412 is greater than the width of the parallel groove section 411. The differential size design can make the orthogonal groove section 412 become the dominant flow path of the surface current of the low-frequency patch 410, form a main and auxiliary current distribution structure with the parallel groove section 411, and then accurately control the current amplitude and phase difference in two orthogonal directions to meet the requirements of orthogonality, equal amplitude, and phase difference of 90° required for circularly polarized radiation, while effectively introducing degenerate modes to widen the low-frequency working bandwidth and ensure the signal receiving gain and stability of the antenna in the low-frequency target frequency band.

[0040] Further, in the length direction of the orthogonal slot segment 412, the parallel slot segment 411 is arranged towards the extension end of the orthogonal slot segment 412, and the parallel slot segment 411 is symmetrically arranged on both sides of the orthogonal slot segment 412 in the width direction. This layout design can further optimize the current path on the surface of the low-frequency patch 410, so that the current forms a stable distribution in the intersection area of the orthogonal slot segment 412 and the parallel slot segment 411, which not only ensures the stability of the phase difference of the orthogonal current, but also avoids the biased distortion of the current distribution through symmetric arrangement, thereby strengthening the excitation effect of the degenerate mode and ensuring the purity and bandwidth stability of the circularly polarized radiation in the low-frequency band, providing reliable structural support for efficient signal reception of the antenna in the low-frequency target frequency band.

[0041] Correspondingly, the adjustment slot 421 extends from the side of the high-frequency patch 420 close to the center of the top substrate 110 to the inside, the extension length of the adjustment slot 421 is less than the length of the orthogonal slot segment 412, and the width of the adjustment slot 421 is greater than the width of the orthogonal slot segment 412. This structure design can adapt to the signal characteristics of the high-frequency band, avoid interference with the edge effect of the high-frequency patch 420 by limiting the extension length of the adjustment slot 421, and at the same time optimize the flow path of the high-frequency current by using a wider slot structure, forming a complementary cooperation in size and function with the orthogonal slot segment 412 of the low-frequency patch 410, ensuring that the high-frequency patch 420 forms a resonant mode that meets the circular polarization requirements in the target frequency band, effectively improving the gain and anti-interference ability of high-frequency signal reception, and realizing the cooperative optimization of high-low frequency dual-band performance.

[0042] Further, in the length direction of the radiation mechanism 400, the distance between the adjustment slot 421 of the high-frequency patch 420 and the center of the top substrate 110 is less than the distance between the orthogonal slot segment 412 of the low-frequency patch 410 and the center of the top substrate 110. This layout design can form an orderly layered arrangement in space between the adjustment slot 421 of the high-frequency patch 420 and the orthogonal slot segment 412 of the low-frequency patch 410, which not only avoids direct electromagnetic coupling interference between the high-low frequency slot structures, but also allows them to correspond to the signal transmission characteristics of the high-low frequency target frequency band respectively, ensuring the independent and stable excitation of the high-frequency band resonant mode, while cooperating with the center-symmetric layout of the radiation mechanism 400, further optimizing the isolation and gain consistency of dual-band signal reception, and ensuring that the antenna has excellent circularly polarized radiation performance in high-low frequency dual-band.

[0043] In addition, the radiation mechanism 400 also includes two extension patches 430, which are respectively connected to one side of the low-frequency patch 410 close to the edge of the top substrate 110 in the width direction, and extend from the side close to the center of the top substrate 110 to the other side in the length direction of the low-frequency patch 410. The length of the extension patch 430 is less than the length of the low-frequency patch 410, and the width of the extension patch 430 is less than the width of the low-frequency patch 410. This extension structure can additionally lengthen the current flow path of the low-frequency patch 410 without destroying the main resonance characteristics of the low-frequency patch 410. By fine-tuning the current transmission time delay, the phase difference of the orthogonal direction current is optimized to be closer to 90° required by circularly polarized radiation, which improves the circular polarization purity of the low-frequency band. At the same time, the small size design can avoid electromagnetic interference with the high-frequency patch 420. In combination with the limitation of the extension direction, the low-frequency working bandwidth can be further widened, the radiation pattern can be optimized, the signal reception blind area in the vehicle-mounted scene can be reduced, and the stability and gain consistency of the low-frequency signal reception can be ensured.

[0044] Referring to Figure 4 and Figure 5 It can be seen from Figure 4 that the impedance bandwidth of the dual-frequency navigation glass antenna is: 1.16GHz-1.29GHz, 1.52GHz-1.62GHz. It can be seen from Figure 5 that the axial ratio bandwidth of the dual-frequency navigation glass antenna is: 1.25GHz-1.28GHz, 1.54GHz-1.59GHz. Therefore, the dual-frequency navigation glass antenna has a dual-frequency characteristic and can cover two navigation frequency bands of B3 (1.268GHz) and L1 (1.575GHz). Based on this, Figure 6 and Figure 7 are respectively two-dimensional radiation patterns of the dual-frequency navigation glass antenna at 1.268GHz and 1.575GHz according to the embodiment. It can be seen from the figure that the invention has stable radiation characteristics, and the gain is 1.59dBic at low frequency and 1.64dBic at high frequency.

[0045] Embodiment Two: The embodiment provides a dual-frequency navigation communication system, which includes the dual-frequency navigation glass antenna according to the embodiment one.

[0046] In summary, the double-frequency navigation glass antenna and communication system disclosed by the application takes the composite glass substrate 100 as a carrier, integrates the ground plane 200 between the adhesive layer 120 and the bottom substrate 130 inside the substrate, and sets the radiation mechanism 400 on the outer surface of the top substrate 110, without occupying additional vehicle-mounted installation space, and has the advantages of concealment and aesthetics. Meanwhile, the sandwich structure of the composite glass substrate 100 can reliably protect the internal feeding structure from the influence of external environments such as vibration, rain and snow, and ultraviolet rays, greatly improving the service life and working stability of the antenna under complex vehicle-mounted working conditions. By arranging the two low-frequency patches 410 and the two high-frequency patches 420 in a central symmetry and staggered manner with the center of the top substrate 110 as the symmetric point, cooperating with the parallel groove section 411 and the orthogonal groove section 412 arranged vertically on the low-frequency patch 410, and the high-frequency patch 420 adjusting groove 421 parallel to the extension direction of the orthogonal groove section 412, the resonant mode meeting the orthogonality and equal amplitude can be excited in the high-frequency and low-frequency target frequency bands respectively, stable circularly polarized radiation is realized, the anti-interference ability and positioning accuracy of the navigation signal reception are effectively improved, and the problems of poor adaptability of the traditional single-frequency antenna and unstable polarization performance of the multi-frequency antenna are solved.

[0047] Meanwhile, the transmission channel 210 on the ground plane 200 is correspondingly arranged with the microstrip feed line 300, which can effectively penetrate the electromagnetic shielding of the ground plane 200, build an efficient energy coupling path, and ensure the accurate transmission of the feeding energy to the radiation mechanism 400. The symmetric layout of the radiation mechanism 400 and the coordinated design of the groove structure can effectively introduce degenerate modes, widen the effective working bandwidth of the high-frequency and low-frequency bands, improve the gain consistency of the antenna in the target frequency band, and avoid the occurrence of signal reception blind area. Therefore, the high-precision navigation scene can be effectively adapted, and the defects of the traditional navigation antenna, such as narrow bandwidth, large gain fluctuation, and weak signal reception in some frequency bands, are solved, and the synergistic optimization of double-frequency performance, integrated reliability and signal reception quality is realized.

[0048] Obviously, the above embodiments are only examples for clearly illustrating, and are not intended to limit the implementation modes. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the implementation modes are not required or can not be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A dual-frequency navigation glass antenna, characterized in that: include: A composite glass substrate, the composite glass substrate comprising a top substrate, a bottom substrate, and an adhesive layer connecting the top substrate and the bottom substrate; A grounding plane is disposed between the adhesive layer and the bottom substrate, and a transmission channel extending through its thickness direction is provided thereon; A microstrip feed line is disposed on the outer surface of the bottom substrate and is disposed corresponding to the transmission channel; A radiation mechanism is disposed on the outer surface of the top substrate, and the angle between the length direction of the radiation mechanism and the first direction is within a preset range. The radiation mechanism includes two low-frequency patches and two high-frequency patches. The high-frequency patches and the low-frequency patches are arranged alternately and are arranged in a centrally symmetrical structure with the center of the top substrate as the symmetry point in the plane where the top substrate is located. Each low-frequency patch is provided with parallel groove segments and orthogonal groove segments arranged perpendicularly to each other in the plane where the top substrate is located. The parallel groove segments extend along the length direction of the low-frequency patches. Each high-frequency patch is provided with an adjustment groove, and the extension direction of the adjustment groove is parallel to the extension direction of the orthogonal groove segment.

2. The dual-frequency navigation glass antenna according to claim 1, characterized in that: The preset range is 30~40°.

3. The dual-frequency navigation glass antenna according to claim 1, characterized in that: The orthogonal slot extends inward from the side of the low-frequency patch closest to the center of the top substrate in the width direction. The length of the orthogonal slot is greater than the length of the parallel slot, and the width of the orthogonal slot is greater than the width of the parallel slot.

4. The dual-frequency navigation glass antenna according to claim 3, characterized in that: Along the length of the orthogonal groove segment, the parallel groove segment is positioned towards the extended end of the orthogonal groove segment, and the parallel groove segment is arranged symmetrically on both sides of the corresponding orthogonal groove segment along its width.

5. The dual-frequency navigation glass antenna according to claim 1, characterized in that: The radiation mechanism further includes two extension patches, which are respectively connected to the side of the low-frequency patch near the edge of the top substrate in the width direction. The extension patches extend from the side of the low-frequency patch near the center of the top substrate to the other side in the length direction. The length of the extension patch is less than the length of the low-frequency patch, and the width of the extension patch is less than the width of the low-frequency patch.

6. The dual-frequency navigation glass antenna according to claim 1, characterized in that: The adjustment groove extends inward from the side of the high-frequency patch near the center of the top substrate in the width direction. The extension length of the adjustment groove is less than the length of the orthogonal groove segment, and the width of the adjustment groove is greater than the width of the orthogonal groove segment.

7. The dual-frequency navigation glass antenna according to claim 6, characterized in that: Along the length of the radiation mechanism, the distance between the adjustment groove and the center of the top substrate is less than the distance between the orthogonal groove segment and the center of the top substrate.

8. The dual-frequency navigation glass antenna according to claim 1, characterized in that: The microstrip feed line extends along a second direction, and its linewidth at the end near the center of the bottom substrate is greater than its linewidth at the end away from the center of the bottom substrate.

9. The dual-frequency navigation glass antenna according to claim 1, characterized in that: The transmission channel is located in the middle of the grounding plane and is configured as a rectangular slot extending along a first direction. The extension length of the transmission channel is 1 / 4 wavelength corresponding to its center resonant frequency.

10. A dual-frequency navigation and communication system, characterized in that: Includes the dual-frequency navigation glass antenna as described in any one of claims 1 to 9.

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