Patch double-antenna and vehicle-mounted antenna device

Abstract

The utility model provides a patch dual antenna and a vehicle-mounted antenna device, a feed end of a first antenna module is connected with an antenna end of a first filtering module, a feed end of the first filtering module is used for accessing a first feed signal, and the first filtering module is used for filtering the first feed signal; the feed end of the second antenna module is connected with the antenna end of the second filtering module, the feed end of the second filtering module is used for accessing a second feed signal, the second filtering module is used for filtering the second feed signal, and the switch end of the second antenna module is connected with the antenna end of the tuning module; the tuning module is used for tuning the low-frequency bandwidth based on the control signal. The isolation degree between the first antenna module and the second antenna module is improved through the first filtering module and the second filtering module, the frequency band coverage range of the patch double antenna is expanded based on the tuning module, and the occupied area of the antenna is reduced.

Description

Technical Field

[0001] This application relates to the technical field of antennas, and more particularly, to a patch dual antenna and a vehicle-mounted antenna device. Background Art

[0002] With the rapid development of technology, the original antenna technology is increasingly difficult to meet the requirements of a large number of complex wireless scenarios. A single antenna can no longer meet the demand for large bandwidth, so dual antennas have become the primary means to solve the problem of large bandwidth.

[0003] In the prior art, dual antenna designs are usually based on Printed Circuit Boards (PCBs) to achieve multi-band coverage, and the antenna traces are usually adjusted to tune within the medium and high frequency bands.

[0004] However, the antennas in the prior art cannot achieve full-band coverage from 0.7 GHz to 6 GHz due to low isolation, and tuning by adjusting the traces takes up a large amount of space and cannot meet the requirements of miniaturization. Summary of the Utility Model

[0005] The purpose of this application is to provide a patch dual antenna and a vehicle-mounted antenna device to solve the problems of large space occupation and small frequency band coverage in the prior art.

[0006] To achieve the above purpose, the technical solution adopted in this application is as follows:

[0007] In a first aspect, this application provides a patch dual antenna, which includes: a first antenna module, a second antenna module, a first filtering module, a second filtering module, and a tuning module. The first antenna module and the second antenna module are both double-layer structures.

[0008] The feeding end of the first antenna module is connected to the antenna end of the first filtering module. The feeding end of the first filtering module is used to access a first feeding signal, and the first filtering module is used to filter the first feeding signal.

[0009] The feeding end of the second antenna module is connected to the antenna end of the second filtering module. The feeding end of the second filtering module is used to access a second feeding signal, and the second filtering module is used to filter the second feeding signal.

[0010] The switching end of the second antenna module is connected to the antenna end of the tuning module, and the tuning module is used to tune the low-frequency bandwidth based on a control signal.

[0011] Optionally, the first filtering module includes: a first filtering unit and a second filtering unit.

[0012] The first end of the first filtering unit is connected to the feeding end of the first antenna module, and the second end of the first filtering unit is connected to the first end of the second filtering unit;

[0013] The second end of the second filtering unit is used to access the first feeding signal.

[0014] Optionally, the first filtering unit includes: a first capacitor and a first inductor;

[0015] The first end of the first capacitor and the first end of the first inductor are respectively connected to the feeding end of the first antenna module;

[0016] The second end of the first capacitor and the second end of the first inductor are respectively connected to the first end of the second filtering unit.

[0017] Optionally, the second filtering unit includes: a second capacitor and a second inductor;

[0018] The first end of the second inductor is connected to the second end of the first filtering unit, and the second end of the second inductor is grounded;

[0019] The first end of the second capacitor is connected to the first end of the second inductor, and the second end of the second capacitor is used to access the first feeding signal.

[0020] Optionally, the second filtering module includes a tuning unit and a third filtering unit;

[0021] The first end of the tuning unit is connected to the feeding end of the second antenna module, and the second end of the tuning unit is connected to the first end of the third filtering unit;

[0022] The first end of the third filtering unit also accesses a second feeding signal, and the second end of the third filtering unit is grounded.

[0023] Optionally, the tuning unit includes a third capacitor;

[0024] The first end of the third capacitor is connected to the feeding end of the second antenna module, and the second end of the third capacitor is connected to the first end of the third filtering unit.

[0025] Optionally, the third filtering unit includes: a fourth capacitor and a third inductor;

[0026] The first end of the fourth capacitor and the first end of the third inductor are respectively connected to the second end of the tuning unit, and the second end of the fourth capacitor and the second end of the third inductor are respectively grounded.

[0027] Optionally, the tuning module includes: a fourth inductor, a fifth inductor, a sixth inductor, a first switch, a second switch, and a third switch;

[0028] A first end of the first switch is connected to a switch end of the second antenna module, a second end of the first switch is connected to a first end of the fourth inductor, and a second end of the fourth inductor is grounded;

[0029] A first end of the second switch is connected to the switch end of the second antenna module, a second end of the second switch is connected to a first end of the fifth inductor, and a second end of the fifth inductor is grounded;

[0030] A first end of the third switch is connected to the switch end of the second antenna module, a second end of the third switch is connected to a first end of the sixth inductor, and a second end of the sixth inductor is grounded.

[0031] Optionally, the first antenna module is a PIFA structure antenna, and the second antenna module is a loop structure.

[0032] In a second aspect, the present application provides a vehicle-mounted antenna device, and the vehicle-mounted antenna device includes any one of the patch dual antennas in the first aspect.

[0033] The beneficial effects of the present application are: the first filtering module filters the first feeding signal, and the second filtering module filters the second feeding module, thereby reducing the mutual coupling effect between the first antenna module and the second antenna module, improving the isolation degree of each frequency band, and improving the antenna performance. The tuning module is used to tune the low-frequency bandwidth based on the control signal, so that the patch dual antenna can expand the frequency band coverage range on the basis of the original wiring, so as to achieve full-band coverage, and it is not necessary to occupy too much wiring space to expand the frequency band coverage range. On this basis, both the first antenna module and the second antenna module are double-layer wiring structures, so they can occupy a smaller space and meet the miniaturization requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application, so they should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0035] Figure 1 is a schematic structural diagram of a patch dual antenna provided by an embodiment of the present application;

[0036] Figure 2 is a schematic structural diagram of a first filtering module provided by an embodiment of the present application;

[0037] Figure 3 It is a schematic structural diagram of a first filtering unit and a second filtering unit provided by an embodiment of the present application;

[0038] Figure 4 It is a schematic structural diagram of a second filtering module provided by an embodiment of the present application;

[0039] Figure 5 It is a schematic structural diagram of a tuning unit and a third filtering unit provided by an embodiment of the present application;

[0040] Figure 6 It is a schematic structural diagram of a tuning module provided by an embodiment of the present application;

[0041] Figure 7 It is a schematic structural diagram of a first antenna module and a second antenna module provided by an embodiment of the present application;

[0042] Figure 8 It is a schematic diagram of S11 parameters of a first antenna module and a second antenna module provided by an embodiment of the present application;

[0043] Figure 9 It is a schematic diagram of the radiation efficiency and total sales volume of a first antenna module and a second antenna module provided by an embodiment of the present application;

[0044] Figure 10 It is a schematic diagram of the isolation degree between a first antenna module and a second antenna module provided by an embodiment of the present application. Specific embodiments

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It should be understood that the accompanying drawings in the present application are only for the purpose of illustration and description, and are not used to limit the protection scope of the present application. In addition, it should be understood that the schematic drawings are not drawn to actual scale. The flowcharts used in the present application illustrate the operations implemented according to some embodiments of the present application. It should be understood that the operations in the flowchart may not be implemented in sequence, and steps without a logical context relationship may be reversed or implemented simultaneously. In addition, those skilled in the art can add one or more other operations to the flowchart or remove one or more operations from the flowchart under the guidance of the content of the present application.

[0046] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all embodiments. The components of the embodiments of the present application described and illustrated in the drawings here can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0047] It should be noted that the term "including" will be used in the embodiments of the present application to indicate the existence of the features stated thereafter, but does not exclude adding other features.

[0048] In the prior art, dual-antenna design is usually based on PCB to achieve multi-band coverage, and the antenna traces are usually adjusted in the medium and high frequency bands for tuning. However, the isolation degree of the dual antennas in the prior art is low, so full-band coverage from 0.7 GHz to 6 GHz cannot be achieved, and tuning by adjusting the antenna traces takes up a large space and cannot meet the requirements of miniaturization.

[0049] Therefore, the present application proposes a patch dual antenna, including a first antenna module, a second antenna module, a first filtering module, a second filtering module and a tuning module. Among them, the first filtering module and the second filtering module are used for filtering to improve the isolation degree of each frequency band, thereby improving the antenna performance. At the same time, the tuning module tunes the low-frequency bandwidth based on a control signal, so as to realize full-band signal transceiver from 0.7 GHz to 6 GHz.

[0050] Figure 1 is a schematic structural diagram of a patch dual antenna provided by an embodiment of the present application. Next, refer to Figure 1 to introduce the specific structure of the patch dual antenna.

[0051] Optionally, the patch dual antenna includes: a first antenna module 11, a second antenna module 12, a first filtering module 13, a second filtering module 14 and a tuning module 15. The first antenna module 11 and the second antenna module 12 are respectively of a double-layer structure.

[0052] Among them, both the first antenna module 11 and the second antenna module 12 of the patch dual antenna are upper and lower double-layer structures. Specifically, the lower layer is connected to the PCB. As an alternative implementation, the minimum distance between the first antenna module 11 and the second antenna module 12 is 2.5 mm, and the maximum distance is 40 mm. The upper and lower layer spacing is 3 mm, and the maximum clearance between the first antenna module 11 and the second antenna module 12 is 11 mm. Since the first antenna module 11 and the second antenna module 12 are double-layer structures, the antenna traces occupy less space, which can meet the requirements of miniaturization.

[0053] As an alternative implementation, the first filtering module 13, the second filtering module 14 and the tuning module 15 can be arranged on the PCB.

[0054] Optionally, the feeding end of the first antenna module 11 is connected to the antenna end of the first filtering module 13. The feeding end of the first filtering module 13 is used to access the first feeding signal, and the first filtering module 13 is used to filter the first feeding signal.

[0055] Optionally, the first feeding signal is input into the first filtering module 13 for filtering to obtain a first filtered signal, and then the first filtered signal is sent to the first antenna module 11 via the antenna end of the first filtering module 13, so that the first antenna module 11 emits electromagnetic waves in the corresponding frequency band based on the first filtered signal.

[0056] Optionally, the feeding end of the second antenna module 12 is connected to the antenna end of the second filtering module 14. The feeding end of the second filtering module 14 is used to access the second feeding signal, and the second filtering module 14 is used to filter the second feeding signal.

[0057] Optionally, the second feeding signal is input into the second filtering module 14 for filtering to obtain a second filtered signal, and then the second filtered signal is sent to the second antenna module 12 via the antenna end of the second filtering module 14, so that the second antenna module 12 emits electromagnetic waves in the corresponding frequency band based on the second filtered signal.

[0058] Among them, the first feeding signal and the second feeding signal can be emitted by the same control module, so that the first antenna module 11 and the second antenna module 12 can emit electromagnetic waves based on the signals accessed by the control module via the feeding ends.

[0059] As an alternative embodiment, the first filtering module 13 may include at least one inductor and at least one capacitor, which are used to filter the first feeding signal, so as to improve the isolation degree in the medium and high frequency bands between the first antenna module 11 and the second antenna module 12. The second filtering module 14 may include at least one inductor and at least one capacitor, which are used to filter the second feeding signal, so as to improve the isolation degree in the high frequency band between the first antenna module 11 and the second antenna module 12. Among them, which frequency band to filter can be adjusted and set through the specific capacitor and inductor structures in each filtering module.

[0060] It should be noted that since the first filtering module 13 and the second filtering module 14 filter the first feeding signal and the second feeding signal respectively, the mutual coupling effect between the first antenna module 11 and the second antenna module 12 is reduced, and the isolation degree between them is improved. Therefore, the first antenna module 11 and the second antenna module 12 can cover a wide range of frequency band signals without being affected by the isolation degree and reducing the antenna performance.

[0061] Optionally, the switching end of the second antenna module 12 is connected to the antenna end of the tuning module 15, and the tuning module 15 is used to tune the low frequency bandwidth based on a control signal.

[0062] As an alternative embodiment, the tuning module 15 includes a plurality of inductors, and the control module can issue a control signal to control the access of each inductor, so as to tune the low frequency bandwidth. Exemplarily, the tuning module 15 can tune the states of B28, B5 and B8 through a plurality of inductors. Among them, B28 is a frequency from 703 MHz to 803 MHz, B5 is a frequency from 824 MHz to 894 MHz, and B8 is a frequency from 880 MHz to 960 MHz.

[0063] Optionally, the tuning module 15 tunes the low frequency bandwidth, so that the second antenna module 12 can cover signals in a lower frequency band on the basis of the original wiring.

[0064] In this embodiment, the first filtering module filters the first feeding signal, and the second filtering module filters the second feeding module, so as to reduce the mutual coupling effect between the first antenna module and the second antenna module, improve the isolation degree of each frequency band, and improve the antenna performance. The tuning module is used to tune the low frequency bandwidth based on a control signal, so that the patch dual antenna can expand the frequency band coverage range on the basis of the original wiring, so as to achieve full frequency band coverage, and does not need to occupy too much wiring space to expand the frequency band coverage range. On the basis of setting the tuning model, both the first antenna module and the second antenna module are double-layer wiring structures, so more space can be saved to meet the miniaturization requirements.

[0065] After introducing the overall structure of the patch dual antenna, the first filtering module 13, the second filtering module 14, and the tuning module 15 of the patch dual antenna will be introduced respectively.

[0066] First, Figure 2 is a schematic structural diagram of a first filtering module 13 provided by an embodiment of the present application. Next, on the basis of Figure 1 refer to Figure 2 to introduce the first filtering module 13.

[0067] Optionally, the first filtering module 13 includes: a first filtering unit 131 and a second filtering unit 132.

[0068] Among them, the first end of the first filtering unit 131 is connected to the feeding end of the first antenna module 11, and the second end of the first filtering unit 131 is connected to the first end of the second filtering unit 132. The second end of the second filtering unit 132 is used to access the first feeding signal.

[0069] As an optional implementation manner, the first filtering unit 131 and the second filtering unit 132 have different structures and filter different frequency bands respectively to improve the isolation degree of different frequency bands of the first antenna module 11 and the second antenna module 12.

[0070] Exemplarily, the first filtering unit 131 improves the isolation degree of the intermediate frequency band, and the second filtering unit 132 improves the isolation degree of the high frequency band.

[0071] In this embodiment, the first feeding signal is filtered by the first filtering unit and the second filtering unit in sequence, so as to improve the isolation degree between the first antenna module and the second antenna module and improve the antenna performance.

[0072] Furthermore, on the basis of the structure of the first filtering module 13 in Figure 2 the first filtering unit 131 and the second filtering unit 132 as shown in Figure 3 are proposed. Next, refer to Figure 3 to introduce the first filtering unit 131 and the second filtering unit 132 in detail.

[0073] Optionally, the first filtering unit 131 includes: a first capacitor C1 and a first inductor L1.

[0074] Among them, the first end of the first capacitor C1 and the first end of the first inductor L1 are respectively connected to the feeding end of the first antenna module 11. The second end of the first capacitor C1 and the second end of the first inductor L1 are respectively connected to the first end of the second filtering unit 132.

[0075] Optionally, in the first filtering unit 131, the first capacitor C1 is connected in parallel with the first inductor L1 to filter out harmonics. Exemplarily, the first capacitor C1 is 1 picofarad and the first inductor L1 is 4 nanohenries. The parallel connection of the two can improve the isolation degree in the intermediate frequency band, such as around 1.6 gigahertz.

[0076] Optionally, the second filtering unit 132 includes: a second capacitor C2 and a second inductor L2.

[0077] Wherein, the first end of the second inductor L2 is connected to the second end of the first filtering unit 131, and the second end of the second inductor L2 is grounded. The first end of the second capacitor C2 is connected to the first end of the second inductor L2, and the second end of the second capacitor C2 is used to access the first feeding signal.

[0078] Optionally, in the second filtering unit 132, the second capacitor C2 is connected in parallel with the second inductor L2, and the second inductor L2 is grounded to filter out harmonics. Exemplarily, the second capacitor C2 is 0.3 picofarad and the second inductor L2 is 6.2 nanohenries. The parallel connection of the two can improve the isolation degree in the high frequency band, such as around 2.4 gigahertz.

[0079] It is worth mentioning that the second end of the second inductor L2 is connected to the ground of the PCB.

[0080] In this embodiment, by connecting the first capacitor and the first inductor in parallel, and by connecting the second capacitor and the second inductor in parallel and grounding, harmonics at different frequency positions are filtered out to improve the isolation degree of different frequencies of the first antenna module and the second antenna module.

[0081] Next, this embodiment proposes the structure of the second filtering module 14 on the basis of Figure 1 the patch dual-antenna structure as shown in Figure 4 . Next, the second filtering module 14 will be introduced with reference to Figure 4 .

[0082] Optionally, the second filtering module 14 includes a tuning unit 141 and a third filtering unit 142.

[0083] Wherein, the first end of the tuning unit 141 is connected to the feeding end of the second antenna module 12, and the second end of the tuning unit 141 is connected to the first end of the third filtering unit 142. The first end of the third filtering unit 142 is also connected to the second feeding signal, and the second end of the third filtering unit 142 is grounded.

[0084] Optionally, the tuning unit 141 is used to tune the bandwidth of the second antenna module 12 so that the coverage frequency band of the second antenna module 12 is staggered from that of the first antenna module 11, thereby covering a wider range of frequency bands.

[0085] Optionally, the third filtering unit 142 is configured to filter the second feeding signal, so that the second antenna module 12 and the first antenna module 11 perform filtering in the corresponding frequency band, thereby improving the isolation degree between the two.

[0086] In this embodiment, the frequency band coverage range of the patch dual antenna is expanded by the tuning unit, and then the isolation degree of the corresponding frequency bands of the first antenna module and the second antenna module is improved by the third filtering unit.

[0087] Further, on the basis of Figure 4 , next, refer to Figure 5 to introduce the structures of the tuning unit 141 and the third filtering unit 142.

[0088] Optionally, the tuning unit 141 includes a third capacitor C3.

[0089] Wherein, the first end of the third capacitor C3 is connected to the feeding end of the second antenna module 12, and the second end of the third capacitor C3 is connected to the first end of the third filtering unit 142.

[0090] As an optional implementation manner, the third capacitor C3 may be 2.4 picofarads.

[0091] Optionally, the third filtering unit 142 includes: a fourth capacitor C4 and a third inductor L3.

[0092] Wherein, the first end of the fourth capacitor C4 and the first end of the third inductor L3 are respectively connected to the second end of the tuning unit 141, and the second end of the fourth capacitor C4 and the second end of the third inductor L3 are respectively grounded.

[0093] As an optional implementation manner, the fourth capacitor C4 may be 0.5 picofarads, and the third inductor L3 may be 10 nanohenries. The third inductor L3 and the fourth capacitor C4 are connected in parallel and grounded, which can improve the isolation degree of the frequency band around 3.8 gigahertz.

[0094] In this embodiment, the isolation degree of the corresponding frequency band position is improved by connecting the fourth capacitor and the third inductor in parallel.

[0095] Next, introduce the specific structure of the tuning module 15 in Figure 1 . Figure 6 is a schematic structural diagram of a tuning module 15 provided by an embodiment of the present application. As shown in Figure 6 , the tuning module 15 includes: a fourth inductor L4, a fifth inductor L5, a sixth inductor L6, a first switch S1, a second switch S2, and a third switch S3.

[0096] Optionally, the first end of the first switch S1 is connected to the switch end of the second antenna module 12, the second end of the first switch S1 is connected to the first end of the fourth inductor L4, and the second end of the fourth inductor L4 is grounded.

[0097] Optionally, the first end of the second switch S2 is connected to the switch end of the second antenna module 12, the second end of the second switch S2 is connected to the first end of the fifth inductor L5, and the second end of the fifth inductor L5 is grounded.

[0098] Optionally, the first end of the third switch S3 is connected to the switch end of the second antenna module 12, the second end of the third switch S3 is connected to the first end of the sixth inductor L6, and the second end of the sixth inductor L6 is grounded.

[0099] Optionally, the first switch S1 is used to control the access of the fourth inductor L4, the second switch S2 is used to control the access of the fifth inductor L5, and the third switch S3 is used to control the access of the sixth inductor L6. By accessing the second antenna module 12 through the fourth inductor L4, the fifth inductor L5, and the sixth inductor L6 respectively, different bandwidths can be tuned.

[0100] Among them, the fourth inductor L4 can be 65 nanohenries. When the control signal controls the first switch S1 to close and the second switch S2 and the third switch S3 to open, the second antenna module 12 can cover the frequency band from 703 megahertz to 803 megahertz. The fifth inductor L5 can be 30 nanohenries. When the control signal controls the second switch S2 to close and the first switch S1 and the third switch S3 to open, the second antenna module 12 can cover the frequency band from 824 megahertz to 894 megahertz. The sixth inductor L6 can be 6.2 nanohenries. When the control signal controls the third switch S3 to close and the first switch S1 and the second switch S2 to open, the second antenna module 12 can cover the frequency band from 880 megahertz to 960 megahertz.

[0101] In this embodiment, by controlling the access of the fourth inductor through the first switch, the access of the fifth inductor through the second switch, and the access of the sixth inductor through the third switch, the second antenna module can cover different frequency bands.

[0102] As an alternative embodiment, the first antenna module 11 in the patch dual antenna is a PIFA structure antenna, and the second antenna module 12 is a loop structure.

[0103] Specifically, the second antenna module 12 can be a Loop loop structure.

[0104] Exemplarily, the structures of the first antenna module 11 and the second antenna module 12 can be as Figure 7 shown. Figure 7 On the left is the lower layer structure of the first antenna module 11 and the second antenna module 12, Figure 7On the right is the upper structure of the first nature module and the second antenna module 12.

[0105] It is worth mentioning that the second antenna module 12 with a Loop loop structure only makes two loops, thus saving clearance. Also, to ensure coverage of the low-frequency band, the connection tuning module 15 is used to tune the low-frequency bandwidth.

[0106] As Figure 7 shown, the first antenna module 11 and the second antenna module 12 are divided into upper and lower layers and are connected by the cylindrical structure shown in the figure. As Figure 7 shown in the upper layer annotation in the lower middle, the size of the first antenna module 11 is 6.5*11*3, and the size of the second antenna module 12 is 31.5*11*3. The first antenna module 11 and the second antenna module 12 can be connected to a PCB with a size of 90*40*3. Based on Figure 7 the structure of the first antenna module 11, the first antenna module 11 can cover the frequency band from 3.3 GHz to 5 GHz, and the second antenna module 12 can cover the frequency bands from 0.7 GHz to 3.3 GHz and from 5 GHz to 6 GHz. In summary, the patch dual antenna can cover the full-band signal from 0.7 GHz to 6 GHz.

[0107] As an example, on the basis of Figure 7 if the first capacitor C1 is 1 picofarad, the first inductor L1 is 4 nanohenries, the second capacitor C2 is 0.3 picofarad, the second inductor L2 is 6.2 nanohenries, the third capacitor C3 is 2.4 picofarads, the fourth capacitor C4 is 0.5 picofarad, the third inductor L3 is 10 nanohenries, the fourth inductor L4 is 65 nanohenries, the fifth inductor L5 is 30 nanohenries, and the sixth inductor L6 is 6.2 nanohenries. Then the following Figure 8 、 Figure 9 and Figure 10 .

[0108] Figure 8 is the schematic diagram of the S11 parameters of the first antenna module 11 and the second antenna module 12 when the first switch S1, the second switch S2, and the third switch S3 are respectively turned on, where S11 is the reflection coefficient. From Figure 8 it can be seen that between 0.6 GHz and 6 GHz, the S11 parameters are all relatively low.

[0109] Figure 9 is the schematic diagram of the radiation efficiency and total sales volume of the first antenna module 11 and the second antenna module 12 when the first switch S1, the second switch S2, and the third switch S3 are respectively turned on. As Figure 9 shown, the high-frequency radiation efficiency of the first antenna module 11 is above -4 dB, and the radiation efficiency of the second antenna module 12 is above -5 dB.

[0110] Figure 10 It is a schematic diagram of the isolation degree between the first antenna module 11 and the second antenna module 12 when the first switch S1, the second switch S2, and the third switch S3 are respectively turned on. It should be noted that the above-mentioned first filtering unit 131 can improve Figure 10 the isolation degree at position 1 in Figure 10 the isolation degree at position 2 in Figure 10 the isolation degree at position 3 in

[0111] The embodiment of the present application also provides a vehicle-mounted antenna device, and the vehicle-mounted antenna device includes the above-mentioned patch dual antenna.

[0112] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, and all of them should be covered within the protection scope of the present application.

Claims

1. A patch dual antenna, characterized in that, The patch dual antenna includes: a first antenna module, a second antenna module, a first filtering module, a second filtering module, and a tuning module. The first antenna module and the second antenna module are both double-layer structures; The feeding end of the first antenna module is connected to the antenna end of the first filtering module. The feeding end of the first filtering module is used to access a first feeding signal, and the first filtering module is used to filter the first feeding signal; The feeding end of the second antenna module is connected to the antenna end of the second filtering module. The feeding end of the second filtering module is used to access a second feeding signal, and the second filtering module is used to filter the second feeding signal; The switching end of the second antenna module is connected to the antenna end of the tuning module, and the tuning module is used to tune the low-frequency bandwidth based on a control signal.

2. The patch dual antenna according to claim 1, wherein The first filtering module includes: a first filtering unit and a second filtering unit; The first end of the first filtering unit is connected to the feeding end of the first antenna module, and the second end of the first filtering unit is connected to the first end of the second filtering unit; The second end of the second filtering unit is used to access the first feeding signal.

3. The patch dual antenna according to claim 2, characterized in that, The first filtering unit includes: a first capacitor and a first inductor; The first end of the first capacitor and the first end of the first inductor are respectively connected to the feeding end of the first antenna module; The second end of the first capacitor and the second end of the first inductor are respectively connected to the first end of the second filtering unit.

4. The patch dual antenna according to claim 2, characterized in that The second filtering unit includes: a second capacitor and a second inductor; The first end of the second inductor is connected to the second end of the first filtering unit, and the second end of the second inductor is grounded; The first end of the second capacitor is connected to the first end of the second inductor, and the second end of the second capacitor is used to access the first feeding signal.

5. The patch dual antenna according to claim 1, characterized in that, The second filtering module includes a tuning unit and a third filtering unit; The first end of the tuning unit is connected to the feeding end of the second antenna module, and the second end of the tuning unit is connected to the first end of the third filtering unit; The first end of the third filtering unit also accesses the second feeding signal, and the second end of the third filtering unit is grounded.

6. The patch dual antenna according to claim 5, wherein, The tuning unit includes a third capacitor; The first end of the third capacitor is connected to the feeding end of the second antenna module, and the second end of the third capacitor is connected to the first end of the third filtering unit.

7. The patch dual antenna according to claim 5, wherein The third filtering unit includes: a fourth capacitor and a third inductor; The first end of the fourth capacitor and the first end of the third inductor are respectively connected to the second end of the tuning unit, and the second end of the fourth capacitor and the second end of the third inductor are respectively grounded.

8. The patch dual antenna according to claim 1, wherein The tuning module includes: a fourth inductor, a fifth inductor, a sixth inductor, a first switch, a second switch, and a third switch; The first end of the first switch is connected to the switching end of the second antenna module, the second end of the first switch is connected to the first end of the fourth inductor, and the second end of the fourth inductor is grounded; The first end of the second switch is connected to the switch end of the second antenna module, the second end of the second switch is connected to the first end of the fifth inductor, and the second end of the fifth inductor is grounded; The first end of the third switch is connected to the switch end of the second antenna module, the second end of the third switch is connected to the first end of the sixth inductor, and the second end of the sixth inductor is grounded.

9. The patch dual antenna according to claim 1, wherein, The first antenna module is a PIFA structure antenna, and the second antenna module is a loop antenna.

10. A vehicle-mounted antenna device, characterized in that, The vehicle-mounted antenna device includes any one of the patch dual antennas as claimed in claims 1-9.

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