Vehicle-mounted intelligent antenna and use method

Abstract

Disclosed are a vehicle-mounted intelligent antenna and a use method. The vehicle-mounted intelligent antenna comprises: a shark fin antenna assembly, the shark fin antenna assembly being provided on the exterior of a vehicle roof and comprising an LTE Main antenna, an LTE DIV antenna, a GNSS antenna, and an Outer RFR antenna; and a T-Box, the T-Box being located below the vehicle roof and comprising an upper housing assembly, the GNSS antenna being attached to an outer side of an upper housing; a PCBA assembly, comprising a PCBA, an LTE backup antenna, a WIFI antenna, and an Inner RFR antenna; VP and NAD modules, the VP and NAD modules cooperating to control switch switching, meeting communication requirements in different scenarios; a Duplexer frequency divider, which is used for signal frequency division of the Outer RFR antenna; a Combiner / SPDT2, the Combiner being a combiner, the SPDT2 being a single-pole double-throw switch and being used for switching an Outer RFR antenna path, achieving a positioning function; and a lower housing assembly, which is used for fixing the PCBA assembly, the upper housing assembly, and the shark fin antenna assembly. An integrated design is used for the shark fin antenna assembly and the T-Box. The Outer RFR antenna is added in the shark fin, thus solving the problem of vehicle interior and exterior coverage of RFR and WIFI signals and the problem of the degree of isolation between main and diversity antennas being insufficient. In addition, a GNSS antenna receiving signal is enhanced.

Description

Vehicle-mounted smart antenna and application method Technical Field

[0001] The present invention relates to the field of automotive Internet of Things, and in particular to a vehicle-mounted smart antenna and an application method. Background Art

[0002] With the development of the Internet of Vehicles, more and more functions are integrated into in-vehicle smart terminals, and more and more antennas are being used, such as 4G / 5G antennas, GNSS antennas, WIFI antennas, RFR (RKE / TPMS) antennas, etc.

[0003] The internal space of products is becoming increasingly tight. How to ensure that product performance is not affected within the limited space has become an urgent problem that needs to be solved.

[0004] In existing technology, the shark fin includes an LTE Main antenna, an LTE DIV antenna, and a GNSS antenna. The T-BOX internally contains a Wi-Fi antenna, an RFR antenna, and an LTE Backup antenna. However, the LTE Main and LTE DIV antennas are soldered onto a PCB. Due to the limited space in the shark fin, antenna performance generally does not meet requirements, and isolation between the two antennas is poor. The LTE DIV antenna is reused with an external Wi-Fi antenna. When the LTE DIV antenna is used as a Wi-Fi antenna, the entire communication system lacks diversity reception, impacting overall reception performance and transmission rate. The shark fin lacks an external RFR antenna, resulting in weak signals in off-board TPMS and RKE applications.

[0005] Another technology utilizes Bluetooth Low Energy (BLE) and Wireless LAN (WLAN) both inside and outside the vehicle to locate the user via a smartphone. However, this approach has the disadvantage of placing the RFR antenna only inside the vehicle, leaving weak signals outside. This can lead to communication issues when the wireless key fob (RKE) and tire pressure monitoring system (TPMS) are low on battery. Due to vehicle design limitations, the shark fin cannot be too large, and the antenna patent prohibits excessive obstruction of the GNSS antenna (which can affect GNSS positioning). This limits the routing space for the LTE main and diversity antennas, resulting in performance degradation and insufficient low-frequency isolation for the main and diversity antennas. Furthermore, the GNSS antenna is partially obstructed by the LTE main and diversity antennas, making positioning difficult when the satellite signal is weak. Technical issues

[0006] The technical problems to be solved by the present invention are how to ensure RFR and WIFI signal coverage inside and outside the vehicle, how to solve the problem of insufficient isolation between the main and diversity antennas, and how to enhance the GNSS antenna reception signal. Technical Solutions

[0007] The present invention provides a vehicle-mounted smart antenna, comprising:

[0008] Shark fin antenna assembly, which is located on the outside of the vehicle roof and includes an LTE MAIN antenna, an LTE DIV antenna, a GNSS antenna, and an OutterRFR antenna;

[0009] T-BOX, which is located under the roof and contains

[0010] Upper shell assembly, GNSS antenna attached to the outer side of the upper shell;

[0011] PCBA components, including PCBA, LTE Backup antenna, Wi-Fi antenna, and InnerRFR antenna; VP and NAD modules, which collaborate to control switching to meet communication requirements in different scenarios; Duplexer divider, used to divide the frequency of the OutterRFR antenna signal; combiner / SPDT2, the combiner is a combiner used to combine the GNSS signal received by the GNSS antenna and the GNSS signal received by the OutterRFR ANT to activate the signal enhancement function; SPDT2 is a single-pole double-throw switch used to switch between the two GNSS antennas. It is controlled by the system and switches the OutterRFR antenna path in the event of a GNSS antenna failure to achieve the positioning function;

[0012] A lower shell assembly, used to fix the PCBA assembly, the upper shell assembly and the shark fin antenna assembly;

[0013] The shark fin antenna assembly and the T-BOX adopt an integrated design.

[0014] Furthermore, the OutterRFR antenna supports RFR frequency bands and GNSS frequency bands, performs frequency division processing through the Duplexer, and transmits the low-frequency RFR signal to the RFR module for processing. The OutterRFR and InnerRFR antennas work together to enhance the RFR signal coverage inside and outside the vehicle.

[0015] Furthermore, the duplexer transmits the high-frequency GNSS signal to the NAD module via the combiner / SPDT2 after frequency division to enhance the GNSS positioning signal.

[0016] Furthermore, the LTE Main antenna and the OutterRFR antenna adopt a back-to-back design, adjust the antenna pattern and gap, and use the coupling effect between the two antennas to generate equivalent capacitance, making the LTE Main antenna a composite left-handed antenna. It is equivalent to a left-handed antenna mode at low frequencies and a right-handed antenna mode at medium and high frequencies, which is used to reduce the design size of the LTE Main antenna.

[0017] Furthermore, the LTE DIV antenna is a right-handed antenna, which conforms to the right-hand transmission theory, and the electromagnetic wave propagation satisfies the right-hand spiral law; the LTE Main antenna is a composite left-handed antenna, its low frequency conforms to the left-hand transmission theory, and the electromagnetic wave propagation satisfies the left-hand spiral law.

[0018] The technical solution of the present invention adds an Outter RFR antenna to the shark fin, which solves the problem of RFR and WIFI signal coverage inside and outside the vehicle, the problem of insufficient isolation between the main and diversity antennas, and enhances the GNSS antenna reception signal.

[0019] To achieve the above object, the present invention provides an application method of a vehicle-mounted smart antenna, the above antenna comprising the following steps:

[0020] The shark fin antenna is working properly and Wi-Fi communication is used in the car.

[0021] S100, cellular communication, is controlled by the system to switch between using the LTE MAIN antenna in the shark fin as the main antenna and the LTE DIV antenna as the diversity antenna;

[0022] S150, GNSS positioning, uses a combiner to combine the satellite signals received by the GNSS antenna and the satellite signals received by the OutterRFR antenna, which plays a signal enhancement and compensation role for the GNSS receiver; or uses SPDT2 to use the OutterRFR antenna as a backup antenna, switching to the OutterRFR antenna path to achieve positioning function in the event of GNSS antenna failure;

[0023] S170RFR communication is divided into tire pressure monitoring TPMS communication and wireless car key RKE communication. The system controls the switch to switch and select the OutterRFR antenna or InnerRFR antenna according to the actual signal strength.

[0024] Furthermore, the following steps are included:

[0025] S130, WIFI communication, the system controls the switch to use the built-in WIFI antenna to meet the in-car usage scenario.

[0026] Furthermore, the following steps are included:

[0027] S140, WIFI communication, the system controls the switch to use the LTE DIV antenna as an external WIFI antenna to meet the scenario of outdoor use.

[0028] Furthermore, the following steps are included:

[0029] When the shark fin antenna falls off,

[0030] Cellular communication, controlled by the system, uses the LTE Backup antenna in the shark fin as the main antenna to achieve E-Call function, without diversity antenna;

[0031] WIFI communication, controlled by the system to switch to use the built-in WIFI antenna;

[0032] GNSS communication: In this state, the GNSS antenna is not used, and the position information reported before the shark fin antenna falls off is used in combination with the base station positioning situation;

[0033] RFR communication is divided into tire pressure monitoring TPMS communication and wireless car key RKE communication, and the system controls the switching to use the InnerRFR antenna. Beneficial effects

[0034] The technical solution of the present invention adds an OutterRFR antenna to the shark fin, which solves the problem of RFR and WIFI signal coverage inside and outside the vehicle, the problem of insufficient isolation of the main diversity antenna, and enhances the GNSS antenna reception signal. At the same time, it solves the communication problem of the LTE Backup antenna, WIFI antenna, and InnerRFR antenna when the shark fin antenna falls off. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG1 is an exploded view of a product of the present invention;

[0036] FIG2 is an electronic structure diagram of an embodiment of the present invention;

[0037] FIG3 is an appearance diagram and a technical schematic diagram of a component of the present invention;

[0038] FIG4 is an electronic structure diagram of another embodiment of the present invention;

[0039] FIG5 is an electronic structure diagram of another embodiment of the present invention;

[0040] FIG6 is an electronic structure diagram of another embodiment of the present invention. Best Mode for Carrying Out the Invention

[0041] The following describes several preferred embodiments of the present invention with reference to the accompanying drawings to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the scope of protection of the present invention is not limited to the embodiments mentioned herein.

[0042] In the drawings, components with identical structures are denoted by the same reference numerals, and components with similar structures or functions are denoted by similar reference numerals. The size and thickness of each component shown in the drawings are arbitrary and are not limited by the present invention. For clarity, the thickness of components in some places in the drawings is appropriately exaggerated.

[0043] An embodiment of the present invention provides a vehicle-mounted smart antenna, as shown in FIG1 , comprising:

[0044] Shark fin antenna assembly 1, located on the outside of the vehicle roof; includes LTE MAIN antenna, LTE DIV antenna, GNSS antenna 10, and OutterRFR antenna;

[0045] T-BOX, T-BOX is under the roof, including

[0046] Upper shell component 2, GNSS antenna attached to the outer side of the upper shell;

[0047] PCBA assembly 3, including the PCBA, LTE Backup antenna, Wi-Fi antenna, and InnerRFR antenna; VP and NAD modules, which collaborate to control switching to meet communication requirements in different scenarios; a duplexer divider for frequency division of the OutterRFR antenna signal; a combiner / SPDT2 for transmitting signals from the OutterRFR antenna or GNSS antenna to the NAD module; the NAD module includes an AP and a GNSS receiver, and the GNSS signal from the combiner / SPDT2 is transmitted to the GNSS receiver;

[0048] The lower shell assembly 4 is used to fix the PCBA assembly 3, the upper shell assembly 2 and the shark fin antenna assembly 1;

[0049] The shark fin antenna assembly and T-BOX adopt an integrated design.

[0050] As shown in Figure 2, the OutterRFR antenna supports both RFR and GNSS bands. A duplexer performs frequency division, transmitting low-frequency RFR signals to the RFR module for processing. The OutterRFR and InnerRFR antennas work together to enhance RFR signal coverage inside and outside the vehicle. After frequency division, the duplexer transmits high-frequency GNSS signals to the combiner / SPDT2, which transmits them to the NAD module for enhanced GNSS positioning signals.

[0051] As shown in Figure 3, the LTE Main antenna and OutterRFR antenna are designed back-to-back. By adjusting the antenna pattern and gap, the coupling effect between the two antennas generates equivalent capacitance, making the LTE Main antenna a composite left-handed antenna. It operates in a left-handed antenna mode at low frequencies and a right-handed antenna mode at mid- and high-frequency frequencies, reducing the design size of the LTE Main antenna.

[0052] The LTE DIV antenna is a right-handed antenna, which conforms to the right-hand transmission theory, and the electromagnetic wave propagation follows the right-hand spiral law. The LTE Main antenna is a composite left-handed antenna, and its low frequency conforms to the left-hand transmission theory, and the electromagnetic wave propagation follows the left-hand spiral law.

[0053] Figure 3(a) shows an ideal right-handed transmission line model, where electromagnetic wave propagation follows the right-hand spiral law. Conventional antennas on terminals all conform to this equivalent model and are called right-handed antennas.

[0054] Figure 3(b) shows an ideal left-handed transmission line model, where electromagnetic wave propagation follows the left-handed spiral law. Antennas that conform to this model are called left-handed antennas.

[0055] Figure 3(c) shows an ideal left-handed transmission line model, where electromagnetic waves obey different propagation laws at different frequencies. Antennas that conform to this model are called composite left-handed antennas.

[0056] The technical solution of the present invention adds an Outter RFR antenna to the shark fin, which solves the problem of RFR and WIFI signal coverage inside and outside the vehicle, the problem of insufficient isolation between the main and diversity antennas, and enhances the GNSS antenna reception signal.

[0057] To achieve the above object, the present invention provides an embodiment of a method for applying a vehicle-mounted smart antenna, wherein the method comprises the following steps:

[0058] The shark fin antenna is working properly and Wi-Fi communication is used in the car.

[0059] S100, cellular communication, is controlled by the system to switch between using the LTE MAIN antenna in the shark fin as the main antenna and the LTE DIV antenna as the diversity antenna;

[0060] S150, GNSS positioning, uses a combiner to combine the satellite signals received by the GNSS antenna and the satellite signals received by the OutterRFR antenna, which plays a signal enhancement and compensation role for the GNSS receiver; or uses SPDT2 to use the OutterRFR antenna as a backup antenna, switching to the OutterRFR antenna path to achieve positioning function in the event of GNSS antenna failure;

[0061] S170RFR communication is divided into tire pressure monitoring TPMS communication and wireless car key RKE communication. The system controls the switch to switch and select the OutterRFR antenna or InnerRFR antenna according to the actual signal strength.

[0062] The following steps are also included:

[0063] S130, WIFI communication, the system controls the switch to use the built-in WIFI antenna to meet the in-car usage scenario.

[0064] The following steps are also included:

[0065] S140, WIFI communication, the system controls the switch to use the LTE DIV antenna as an external WIFI antenna to meet the scenario of outdoor use.

[0066] The following steps are also included:

[0067] When the shark fin antenna falls off,

[0068] Cellular communication, controlled by the system, uses the LTE Backup antenna in the shark fin as the main antenna to achieve E-Call function, without diversity antenna;

[0069] WIFI communication, controlled by the system to switch to use the built-in WIFI antenna;

[0070] GNSS communication: In this state, the GNSS antenna is not used, and the position information reported before the shark fin antenna falls off is used in combination with the base station positioning situation;

[0071] RFR communication is divided into tire pressure monitoring TPMS communication and wireless car key RKE communication, and the system controls the switching to use the InnerRFR antenna.

[0072] A preferred embodiment of the present invention is shown in FIG4 , where the shark fin antenna is normal and WIFI communication is used in the car,

[0073] 1) For cellular communication, the system controls SPDT1, SPDT3, and SPDT4 to switch to the status shown in the figure, using the LTE MAINANT in the shark fin as the main antenna and the LTE DIVANT as the diversity antenna.

[0074] 2) WIFI communication: the system controls SPDT5 to switch to the status shown in the figure and use the built-in WIFIANT to meet the in-car usage scenario.

[0075] 3) GNSS positioning is divided into two schemes:

[0076] One is to use a combiner to combine the satellite signals received by the GNSS antenna and the satellite signals received by the OutterRFRANT, thereby enhancing and compensating the signal for the GNSS receiver.

[0077] The second method is to use SPDT2 and OutterRFRANT as a backup antenna. When the GNSS antenna fails, it will switch to the OutterRFRANT path to achieve positioning function.

[0078] 4) RFR communication is divided into tire pressure monitoring (TPMS) communication and wireless key fob (RKE) communication. The system controls the SPDT6 switch to select OutterRFRANT or InnerRFRANT based on the actual signal strength.

[0079] A preferred embodiment of the present invention is shown in FIG5 , where the shark fin antenna is in normal condition and Wi-Fi communication is used outside the vehicle:

[0080] For cellular communication, the system controls SPDT0, SPDT1, and SPDT3 to switch to the status shown in the figure, using the LTE MAINANT in the shark fin as the main antenna and the LTE BackupANT as the diversity antenna.

[0081] For WIFI communication, the system controls SPDT4 and SPDT5 to switch to the status shown in the figure and use LTE DIVANT as an external WIFI antenna to meet the needs of outdoor use.

[0082] GNSS positioning is divided into two solutions:

[0083] One is to use a combiner to combine the satellite signals received by the GNSS antenna and the satellite signals received by the OutterRFRANT, thereby enhancing and compensating the signal for the GNSS receiver.

[0084] The second method is to use SPDT2 and OutterRFRANT as a backup antenna. When the GNSS antenna fails, it will switch to the OutterRFRANT path to achieve positioning function.

[0085] RFR communication is divided into tire pressure monitoring (TPMS) communication and wireless key fob (RKE) communication. The system controls the SPDT6 switch to select OutterRFRANT or InnerRFRANT based on the actual signal strength.

[0086] A preferred embodiment of the present invention is shown in FIG6 :

[0087] In the event that the shark fin antenna falls off,

[0088] For cellular communication, SPDT0 and SPDT1 are controlled by the system and switched to the status shown in the figure. The E-Call function can be realized by using the LTE BackupANT in the shark fin as the main antenna, without a diversity antenna.

[0089] For WIFI communication, the system controls SPDT5 to switch to the status shown in the figure, using the built-in WIFIANT.

[0090] GNSS communication: In this state, the GNSS antenna is not used. The position information reported before the shark fin antenna falls off is used in combination with the base station positioning.

[0091] RFR communication is divided into tire pressure monitoring (TPMS) communication and wireless key fob (RKE) communication. The system control switch SPDT6 selects the use of InnerRFRANT.

[0092] The technical solution of the present invention adds an OutterRFR antenna to the shark fin, which solves the problem of RFR and WIFI signal coverage inside and outside the vehicle, the problem of insufficient isolation of the main diversity antenna, and enhances the GNSS antenna reception signal. At the same time, it solves the communication problem of the LTE Backup antenna, WIFI antenna, and InnerRFR antenna when the shark fin antenna falls off.

[0093] The above describes in detail the preferred embodiments of the present invention. It should be understood that numerous modifications and variations based on the concepts of the present invention can be made by those skilled in the art without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims. Modes for Carrying Out the Invention

[0094] Type here a paragraph describing embodiments of the invention. Industrial Applicability

[0095] Type your industrial applicability description paragraph here. Sequence Listing Free Content

[0096] Type your sequence listing free description paragraph here.

Claims

1. A vehicle-mounted smart antenna, characterized in that: include: A shark fin antenna assembly, which is located outside the roof and includes an LTE MAIN antenna, an LTE DIV antenna, a GNSS antenna, and an OutterRFR antenna; T-BOX, the T-BOX is under the roof, wherein, Upper shell assembly, the GNSS antenna is attached to the outer side of the upper shell; PCBA components, including PCBA, LTE Backup antenna, WIFI antenna, InnerRFR antenna; VP and NAD modules, the VP and NAD modules cooperate to control the switch switching to meet the communication needs in different scenarios; Duplexer divider, used for OutterRFR antenna signal frequency division; combiner / SPDT2, Combiner is a combiner, used to combine the GNSS signal received by the GNSS antenna and the GNSS signal received by the Outter RFR ANT to start the enhanced signal function, SPDT2 is a single-pole double-throw switch, used to switch the two GNSS antennas, controlled by the system, and the OutterRFR antenna path is switched in the case of GNSS antenna failure to achieve the positioning function; A lower shell assembly, used to fix the PCBA assembly, the upper shell assembly and the shark fin antenna assembly; The shark fin antenna assembly and the T-BOX adopt an integrated design.

2. The antenna according to claim 1, characterized in that The OutterRFR antenna supports RFR frequency band and GNSS frequency band, performs frequency division processing through the Duplexer, and transmits the low-frequency RFR signal to the RFR module for processing. The OutterRFR and InnerRFR antennas work together to enhance the RFR signal coverage inside and outside the vehicle.

3. The antenna according to any one of claims 1 or 2, characterized in that: The Duplexer transmits the high-frequency GNSS signal after frequency division to the NAD module via combiner / SPDT2 for enhancing the GNSS positioning signal.

4. The antenna according to claim 1, characterized in that The LTE Main antenna and the OutterRFR antenna are designed back-to-back, and the antenna pattern and gap are adjusted. The coupling effect between the two antennas is used to generate equivalent capacitance, so that the LTE Main antenna is a composite left-handed antenna, which is equivalent to a left-handed antenna mode at low frequency and a right-handed antenna mode at medium and high frequencies, and is used to reduce the design size of the LTE main antenna.

5. The antenna according to claim 4, characterized in that The LTE DIV antenna is a right-handed antenna, which conforms to the right-handed transmission theory, and the electromagnetic wave propagation satisfies the right-handed spiral law; the LTE Main antenna is a composite left-handed antenna, whose low frequency conforms to the left-handed transmission theory, and the electromagnetic wave propagation satisfies the left-handed spiral law.

6. The antenna according to claim 1, characterized in that The GNSS antenna is a ceramic antenna. The GNSS uses a long PIN needle design. The PIN needle on the GNSS passes through a plastic fastener. The plastic fastener is embedded in the outer side of the metal cover. The plastic fastener is used to attach the GNSS antenna to the outer side of the metal cover.

7. An application method of a vehicle-mounted smart antenna, characterized in that: The antenna according to any one of claims 1 to 6, comprising the steps of: The shark fin antenna is normal and WIFI communication is used in the car. S100, cellular communication, the system controls the switching to use the LTE MAIN antenna in the shark fin as the main antenna and the LTE DIV antenna as the diversity antenna; S150, GNSS positioning, uses a combiner to combine the satellite signals received by the GNSS antenna and the satellite signals received by the OutterRFR antenna, which can enhance the signal compensation for the GNSS receiver; or uses SPDT2 to use the OutterRFR antenna as a backup antenna, and switches to the OutterRFR antenna path to achieve positioning when the GNSS antenna fails; S170RFR communication is divided into tire pressure monitoring TPMS communication and wireless car key RKE communication. The system controls the switch to switch and select the OutterRFR antenna or InnerRFR antenna according to the actual signal strength.

8. The method according to claim 7, characterized in that The following steps are also included: S130, WIFI communication, the system controls the switch to use the built-in WIFI antenna to meet the in-car usage scenario.

9. The method according to claim 7, characterized in that The following steps are also included: S140, WIFI communication, the system controls the switch to use the LTE DIV antenna as an external WIFI antenna to meet the scenario of outside vehicle use.

10. The method according to claim 7, characterized in that The following steps are also included: When the shark fin antenna falls off, Cellular communication, controlled by the system, uses the LTE Backup antenna in the shark fin as the main antenna to realize the E-Call function, without diversity antenna; WIFI communication, the system controls the switching to use the built-in WIFI antenna; GNSS communication: In this state, no GNSS antenna is used, and the position information reported before the shark fin antenna falls off is used in combination with the base station positioning situation; RFR communication is divided into tire pressure monitoring TPMS communication and wireless car key RKE communication, and the system controls the switching to use the InnerRFR antenna.

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