Antenna circuit, short message equipment and vehicle

Abstract

The utility model relates to an antenna circuit, short message equipment and a vehicle, and the antenna circuit comprises a first antenna, a second antenna and a signal transmission circuit. Wherein under the condition that the first antenna and the signal transmission circuit are detached from a vehicle, the first antenna and the signal transmission circuit form an airborne antenna circuit; and under the condition that the first antenna and the signal transmission circuit are not detached from the vehicle, the second antenna and the signal transmission circuit form a vehicle-mounted antenna circuit.

Description

Technical Field

[0001] The present disclosure relates to vehicle navigation technology, and more specifically, to an antenna circuit, a short message device and a vehicle. Background Art

[0002] Short message technology is a technology that transmits information through a satellite navigation system. It uses satellite networks to achieve short message transmission and can effectively solve emergency communication problems in areas without mobile public network coverage.

[0003] In harsh environments without mobile communication signals, short message communication functions are particularly important. Short message communication service coverage has the characteristics of low cost, wide coverage, high reliability and access at any time. It can effectively supplement the ground mobile communication network to meet the needs of emergency communication, search and rescue and other services in areas without ground network coverage. In recent years, short message communication services have played a positive role in people's livelihood protection, disaster relief and reduction, and field search and rescue.

[0004] Car-mounted short message equipment is generally combined with the vehicle's center console to provide vehicles with all-weather emergency communication, vehicle status reporting, location reporting and other services when ordinary mobile communication signals cannot cover them.

[0005] This short message device combined with the vehicle's central console will not be able to function normally when the vehicle breaks down or when the vehicle is in a bridge tunnel, at the foot of a mountain, or other places where the satellite signal is blocked. Utility Model Content

[0006] One object of the utility model is to provide a new technical solution for antenna circuit.

[0007] According to a first aspect of the utility model, an antenna circuit is provided, comprising: a first antenna, a second antenna and a signal transmission circuit; wherein:

[0008] The first antenna and the signal transmission circuit form an onboard antenna circuit when the first antenna and the signal transmission circuit are removed from the vehicle;

[0009] The second antenna and the signal transmission circuit form a vehicle-mounted antenna circuit when the first antenna and the signal transmission circuit are not removed from the vehicle.

[0010] Optionally, the antenna circuit further includes a first RF connector with a switching switch; wherein,

[0011] The first radio frequency connector is used to switch the connection between the first antenna and the second antenna and the signal transmission circuit.

[0012] Optionally, when the first antenna and the signal transmission circuit are removed from the vehicle, the switching switch of the first RF connector is used to switch the connection between the second antenna and the signal transmission circuit to the connection between the first antenna and the signal transmission circuit.

[0013] Optionally, the signal transmission circuit includes an amplifier circuit on a signal transmission link and an amplifier circuit on a signal receiving link; wherein,

[0014] The amplifying circuit on the signal transmitting link is connected to the output end of the first antenna or the second antenna, and the amplifying circuit on the signal receiving link is connected to the input end of the first antenna or the second antenna.

[0015] Optionally, the amplifying circuit on the signal transmission link includes a preamplifier, a power amplifier, and a first filter; wherein,

[0016] The first end of the preamplifier is connected to the output end of the baseband chip, the second end of the preamplifier is connected to the first end of the power amplifier, the second end of the power amplifier is connected to the first end of the first filter, and the second end of the first filter can be switchably connected to the output end of the first antenna and the output end of the second antenna.

[0017] Optionally, the amplification circuit on the signal receiving link includes a low noise amplifier and two second filters; wherein,

[0018] The first end of the first second filter can be switchably connected to the input ends of the first antenna and the second antenna, the first end of the first second filter is connected to the first end of the low noise amplifier, the second end of the low noise amplifier is connected to the first end of the second second filter, and the second end of the second second filter is connected to the input end of the baseband chip.

[0019] Optionally, the antenna circuit includes a second RF connector and a first RF switch; wherein,

[0020] In a case where the first antenna and the signal transmission circuit form an airborne antenna circuit, the first end of the first radio frequency switch is connected to the signal transmission circuit, and the second end of the first radio frequency switch is switched to be connected to the first antenna;

[0021] When the second antenna and the signal transmission circuit form a vehicle-mounted antenna circuit, the first end of the first RF switch is connected to the signal transmission circuit, the second end of the first RF switch is switched to be connected to the first end of the second RF connector, and the second end of the second RF connector is connected to the second antenna.

[0022] Optionally, the first antenna and the second antenna are both passive antennas.

[0023] Optionally, the first antenna and the second antenna are both active antennas, and the signal transmission circuit includes the first signal transmission circuit and the second signal transmission circuit;

[0024] The first antenna and the first signal transmission circuit form an onboard antenna circuit when the first antenna and the first signal transmission circuit are removed from the vehicle;

[0025] When the first antenna and the first signal transmission circuit are not removed from the vehicle, the second antenna and the second signal transmission circuit form a vehicle-mounted antenna circuit.

[0026] Optionally, the first signal transmission circuit and the second signal transmission circuit both include an amplifier circuit on a signal transmission link and an amplifier circuit on a signal reception link; wherein,

[0027] The amplifier circuit on the signal transmission link of the first signal transmission circuit is connected to the output end of the first antenna, and the amplifier circuit on the signal reception link of the first signal transmission circuit is connected to the input end of the first antenna;

[0028] The amplifier circuit on the signal transmission link of the second signal transmission circuit is connected to the output end of the second antenna, and the amplifier circuit on the signal reception link of the second signal transmission circuit is connected to the input end of the second antenna.

[0029] Optionally, the antenna circuit further includes a second radio frequency switch; wherein,

[0030] A first end of the second RF switch is connected to the baseband chip, and a second end of the second RF switch can be switched to be connected to the first signal transmission circuit or the second signal transmission circuit.

[0031] According to a second aspect of the present invention, a short message device is provided, comprising an antenna circuit as described in any one of the first aspects.

[0032] Optionally, the short message device further includes a controller, a baseband chip, a positioning module, and a physical button module; wherein,

[0033] The baseband chip, the positioning module and the physical button module are all connected to the controller, and the signal transmission circuit is connected to the baseband chip.

[0034] Optionally, the short message device further includes a Bluetooth module; wherein,

[0035] The Bluetooth module is connected to the controller;

[0036] The Bluetooth module is used for establishing Bluetooth communication between the host and the terminal device through the Bluetooth module when the host is removed from the vehicle, so that the terminal device sends a short message to the host through the Bluetooth communication.

[0037] According to a third aspect of the utility model, a vehicle is provided, comprising the short message device as described in the second aspect.

[0038] The antenna circuit provided by the utility model transmits and receives signals through the second antenna and the signal transmission circuit when the first antenna and the signal transmission circuit are not removed from the vehicle, so as to realize the transmission and reception of signals in the vehicle-mounted state. When the vehicle fails and the signal cannot be normally transmitted and received, or when the vehicle is in a position where the signal is blocked, the first antenna and the signal transmission circuit can be removed from the vehicle to independently transmit and receive signals, thereby improving the user experience. Compared with the antenna circuit of a detachable short message device provided on the vehicle, this antenna circuit can not only be used alone with the detachable short message device when the short message device is removed, but also has a redundant antenna when used on the vehicle, and has a lower failure rate in use.

[0039] Features and advantages of the embodiments of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the embodiments of the specification.

[0041] Figure 1 It is a structural block diagram of an antenna circuit according to an embodiment of the utility model.

[0042] Figure 2 It is a circuit diagram of an antenna circuit according to an embodiment of the utility model.

[0043] Figure 3 It is a circuit diagram of an antenna circuit according to an embodiment of the utility model.

[0044] Figure 4 It is a circuit diagram of an antenna circuit according to an embodiment of the utility model.

[0045] Figure 5 It is a structural block diagram of a short message device according to an embodiment of the utility model.

[0046] Figure 6 It is a structural block diagram of a short message device according to an embodiment of the utility model.

[0047] Figure 7It is a principle block diagram of a vehicle according to an embodiment of the utility model. DETAILED DESCRIPTION

[0048] Various exemplary embodiments of the present specification will now be described in detail with reference to the accompanying drawings.

[0049] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the embodiments of the present specification and its application or uses.

[0050] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0051] In one embodiment of the present invention, an antenna circuit is provided. Figure 1 As shown, it includes a first antenna, a second antenna and a signal transmission circuit. When the first antenna and the signal transmission circuit are removed from the vehicle, the first antenna and the signal transmission circuit form an onboard antenna circuit. When the first antenna and the signal transmission circuit are not removed from the vehicle, the second antenna and the signal transmission circuit form a vehicle-mounted antenna circuit.

[0052] When the first antenna and the signal transmission circuit are removed from the vehicle, the first antenna is connected to the signal transmission circuit. The first antenna and the signal transmission circuit removed from the vehicle can independently transmit and receive signals. In this way, when a vehicle malfunctions and short messages cannot be normally transmitted or received, or when the vehicle is in a position where the signal is blocked, the first antenna and the signal transmission circuit can be removed from the vehicle to achieve signal transmission and reception.

[0053] In a case where the first antenna and the signal transmission circuit are not removed from the vehicle, the second antenna is connected to the signal transmission circuit, and signals are transmitted and received through the second antenna and the signal transmission circuit.

[0054] The first antenna may be a passive antenna or an active antenna. The second antenna may be a passive antenna or an active antenna.

[0055] The first antenna is built into the short message device. The second antenna is external to the short message device. The second antenna can be installed on the spoiler, sunroof, front windshield, etc. of the vehicle to receive satellite signals.

[0056] The antenna circuit provided in this embodiment transmits and receives signals through the second antenna and the signal transmission circuit when the first antenna and the signal transmission circuit are not removed from the vehicle, so as to realize the transmission and reception of signals in the vehicle-mounted state. When the vehicle fails and the signal cannot be normally transmitted and received, or when the vehicle is in a position where the signal is blocked, the first antenna and the signal transmission circuit can be removed from the vehicle to independently transmit and receive signals, thereby improving the user experience. Compared with the antenna circuit of a detachable short message device provided on the vehicle, this antenna circuit can not only be used alone with the detachable short message device when the short message device is removed, but also has a redundant antenna when used on the vehicle, and has a lower failure rate.

[0057] In one embodiment of the present invention, the antenna circuit includes a first radio frequency connector with a switch. The switch of the first radio frequency connector is used to switch the connection between the first antenna and the second antenna and the signal transmission circuit.

[0058] When the first antenna and the signal transmission circuit are not removed from the vehicle, the second antenna and the signal transmission circuit are connected through the first RF connector. When the first antenna and the signal transmission circuit are removed from the vehicle, the connection between the second antenna and the signal transmission circuit is switched to the connection between the first antenna and the signal transmission circuit through the first RF connector.

[0059] A first radio frequency connector is provided on both the signal transmission link and the signal reception link.

[0060] In one embodiment, the first RF connector is a Fakra connector (Fachkreis Automobile) with a mechanical automatic switching switch. When the first antenna and the signal transmission circuit are not removed from the vehicle, the second antenna is connected to the signal transmission circuit, and the transmission and reception of the signal are completed through the second antenna. When the first antenna and the signal transmission circuit are removed from the vehicle, the connection between the second antenna and the signal transmission circuit is switched to the connection between the first antenna and the signal transmission circuit through the Fakra connector with a mechanical automatic switching switch. The first antenna and the signal transmission circuit are removed from the vehicle, and the signal can be independently transmitted and received.

[0061] In one embodiment of the utility model, the signal transmission circuit includes an amplifier circuit on a signal transmission link and an amplifier circuit on a signal reception link. The amplifier circuit on the signal transmission link is connected to the output end of the first antenna or the second antenna. The amplifier circuit on the signal reception link is connected to the input end of the first antenna or the second antenna.

[0062] The amplification circuit on the signal transmission link includes a preamplifier, a power amplifier, and a first filter. The first end of the preamplifier is connected to the output end of the baseband chip, the second end of the preamplifier is connected to the first end of the power amplifier, the second end of the power amplifier is connected to the first end of the first filter, and the second end of the first filter can be switched to be connected to the output end of the first antenna and the output end of the second antenna.

[0063] The amplification circuit on the signal receiving link includes a low noise amplifier and two second filters. The first end of the first second filter can be switchably connected to the input end of the first antenna and the second antenna, the first end of the first second filter is connected to the first end of the low noise amplifier, the second end of the low noise amplifier is connected to the first end of the second second filter, and the second end of the second second filter is connected to the input end of the baseband chip.

[0064] It should be noted that the number of low-noise amplifiers in the amplifier circuit on the signal receiving link is not limited to one, but may be multiple, and the number of second filters is not limited to two, but may be greater than two. When the number of low-noise amplifiers is multiple and the number of second filters is greater than two, each low-noise amplifier is connected between two second filters, one of all second filters is connected to the input end of the first antenna or the second antenna, and another of all second filters is connected to the input end of the baseband chip.

[0065] In one embodiment of the utility model, the antenna circuit includes a second radio frequency connector and a first radio frequency switch.

[0066] When the first antenna and the signal transmission circuit form an airborne antenna circuit, the first end of the first radio frequency switch is connected to the signal transmission circuit, and the second end of the first radio frequency switch is switched to be connected to the first antenna.

[0067] When the second antenna and the signal transmission circuit form a vehicle-mounted antenna circuit, the first end of the first RF switch is connected to the signal transmission circuit, the second end of the first RF switch is switched to be connected to the first end of the second RF connector, and the second end of the second RF connector is connected to the second antenna.

[0068] When the first antenna and the signal transmission circuit are not removed from the vehicle, the second antenna and the signal transmission circuit are connected through the second RF connector and the first RF switch. When the first antenna and the signal transmission circuit are removed from the vehicle, the connection between the second antenna and the signal transmission circuit is switched to the connection between the first antenna and the signal transmission circuit through the first RF switch.

[0069] The second radio frequency connector and the first radio frequency switch are both arranged on the signal transmission link and the signal reception link.

[0070] In one embodiment of the utility model, the first antenna and the second antenna are both active antennas, and the antenna circuit includes a first signal transmission circuit and a second signal transmission circuit. Part of the signal transmission circuit can be removed from the vehicle. When the first antenna and the first signal transmission circuit are removed from the vehicle, the first antenna and the first signal transmission circuit form an onboard antenna circuit. When the first antenna and the first signal transmission circuit are not removed from the vehicle, the second antenna and the second signal transmission circuit form a vehicle-mounted antenna circuit.

[0071] When the first antenna and the first signal transmission circuit are removed from the vehicle, the first antenna is connected to the first signal transmission circuit. The first antenna and the first signal transmission circuit removed from the vehicle can independently transmit and receive signals. In this way, when a vehicle malfunctions and short messages cannot be normally transmitted or received, or when the vehicle is in a position where the signal is blocked, the first antenna and the first signal transmission circuit can be removed from the vehicle to achieve signal transmission and reception.

[0072] In a case where the first antenna and the first signal transmission circuit are not removed from the vehicle, the second antenna is connected to the second signal transmission circuit, and signals are transmitted and received through the second antenna and the second signal transmission circuit.

[0073] In one embodiment, the antenna circuit further includes a second radio frequency switch. A first end of the second radio frequency switch is connected to the baseband chip, and a second end of the second radio frequency switch can be switched to be connected to the first signal transmission circuit and the second signal transmission circuit.

[0074] When the first antenna and the first signal transmission circuit are not removed from the vehicle, the second antenna and the second signal transmission circuit form a vehicle-mounted antenna circuit through the second radio frequency switch to transmit and receive signals. When the first antenna and the first signal transmission circuit are removed from the vehicle, the first antenna and the first signal transmission circuit form an airborne antenna circuit through the second radio frequency switch to transmit and receive signals.

[0075] In one embodiment, the first signal transmission circuit and the second signal transmission circuit each include an amplifier circuit on a signal transmission link and an amplifier circuit on a signal reception link.

[0076] The amplification circuit on the signal transmission link includes a preamplifier, a power amplifier, and a first filter. The first end of the preamplifier is connected to the output end of the baseband chip, the second end of the preamplifier is connected to the first end of the power amplifier, the second end of the power amplifier is connected to the first end of the first filter, and the second end of the first filter can be switched to be connected to the output end of the first antenna and the output end of the second antenna.

[0077] The amplification circuit on the signal receiving link includes a low noise amplifier and two second filters. The first end of the first second filter can be switchably connected to the input end of the first antenna and the second antenna, the first end of the first second filter is connected to the first end of the low noise amplifier, the second end of the low noise amplifier is connected to the first end of the second second filter, and the second end of the second second filter is connected to the input end of the baseband chip.

[0078] It should be noted that the number of low-noise amplifiers in the amplifier circuit on the signal receiving link is not limited to one, but may be multiple, and the number of second filters is not limited to two, but may be greater than two. When the number of low-noise amplifiers is multiple and the number of second filters is greater than two, each low-noise amplifier is connected between two second filters, one of all second filters is connected to the input end of the first antenna or the second antenna, and another of all second filters is connected to the input end of the baseband chip.

[0079] Figure 2 is a circuit diagram of an antenna circuit according to an embodiment of the present utility model. Figure 2 The antenna circuit includes a first antenna, a second antenna, a signal transmission circuit and a first radio frequency connector with a switching switch.

[0080] The first antenna and the second antenna are passive antennas. A first radio frequency connector is provided on both the signal transmission link and the signal reception link.

[0081] When the first antenna and the signal transmission circuit are not removed from the vehicle, the second antenna and the signal transmission circuit are connected through the first RF connector. When the first antenna and the signal transmission circuit are removed from the vehicle, the connection between the second antenna and the signal transmission circuit is switched to the connection between the first antenna and the signal transmission circuit through the first RF connector.

[0082] See also Figure 2 The signal transmission circuit includes an amplifier circuit on a signal transmission link and an amplifier circuit on a signal receiving link.

[0083] The amplification circuit on the signal transmission link includes a preamplifier, a power amplifier, and a first filter. The first end of the preamplifier is connected to the output end of the baseband chip, the second end of the preamplifier is connected to the first end of the power amplifier, the second end of the power amplifier is connected to the first end of the first filter, and the second end of the first filter can be switched to be connected to the output end of the first antenna and the output end of the second antenna through a switching switch of the first RF connector.

[0084] The amplification circuit on the signal receiving link includes two low noise amplifiers and three second filters. Each low noise amplifier is connected between two second filters. The first end of one of the second filters can be switched to be connected to the input end of the first antenna and the second antenna through the switching switch of the first RF connector, and the other second filter is connected to the input end of the baseband chip.

[0085] Figure 3 is a circuit diagram of an antenna circuit according to an embodiment of the present utility model. Figure 3 The antenna circuit includes a first antenna, a second antenna, a signal transmission circuit, a second RF connector and a first RF switch.

[0086] The first antenna and the second antenna are passive antennas. A second radio frequency connector and a first radio frequency switch are both provided on the signal transmission link and the signal reception link.

[0087] When the first antenna and the signal transmission circuit are not removed from the vehicle, the second antenna and the signal transmission circuit are connected through the second RF connector and the first RF switch. When the first antenna and the signal transmission circuit are removed from the vehicle, the connection between the second antenna and the signal transmission circuit is switched to the connection between the first antenna and the signal transmission circuit through the second RF connector and the first RF switch.

[0088] See also Figure 3 The signal transmission circuit includes an amplifier circuit on a signal transmission link and an amplifier circuit on a signal receiving link.

[0089] The amplification circuit on the signal transmission link includes a preamplifier, a power amplifier, and a first filter. The first end of the preamplifier is connected to the output end of the baseband chip, the second end of the preamplifier is connected to the first end of the power amplifier, the second end of the power amplifier is connected to the first end of the first filter, and the second end of the first filter can be switched to be connected to the output end of the first antenna and the output end of the second antenna through the first RF switch.

[0090] The amplification circuit on the signal receiving link includes two low noise amplifiers and three second filters. Each low noise amplifier is connected between two second filters. The first end of one of the second filters can be switched to be connected to the input end of the first antenna and the second antenna through the first radio frequency switch, and the other second filter is connected to the input end of the baseband chip.

[0091] Figure 4 is a circuit diagram of an antenna circuit according to an embodiment of the present utility model. Figure 4 The antenna circuit includes a first antenna, a second antenna, a first signal transmission circuit, a second signal transmission circuit and a second radio frequency switch.

[0092] The first antenna and the second antenna are active antennas. A second radio frequency switch is provided on both the signal transmission link and the signal reception link.

[0093] When the first antenna and the first signal transmission circuit are not removed from the vehicle, the second antenna and the second signal transmission circuit form a vehicle-mounted antenna circuit through the second radio frequency switch to transmit and receive signals. When the first antenna and the first signal transmission circuit are removed from the vehicle, the first antenna and the first signal transmission circuit form an airborne antenna circuit through the second radio frequency switch to transmit and receive signals.

[0094] See also Figure 4 The first signal transmission circuit and the second signal transmission circuit both include an amplifier circuit on a signal transmission link and an amplifier circuit on a signal reception link.

[0095] The amplification circuit on the signal transmission link includes a preamplifier, a power amplifier, and a first filter. The first end of the preamplifier is connected to the output end of the baseband chip through the second RF switch, the second end of the preamplifier is connected to the first end of the power amplifier, the second end of the power amplifier is connected to the first end of the first filter, and the second end of the first filter is connected to the output end of the first antenna or the output end of the second antenna.

[0096] The amplification circuit on the signal receiving link includes a low noise amplifier and two second filters. The first end of the first second filter is connected to the input end of the first antenna or the second antenna, the first end of the first second filter is connected to the first end of the low noise amplifier, the second end of the low noise amplifier is connected to the first end of the second second filter, and the second end of the second second filter is connected to the input end of the baseband chip through the second radio frequency switch.

[0097] In one embodiment of the present invention, a short message device is provided. Figure 5 , the short message device includes the antenna circuit provided by any of the above embodiments.

[0098] In one embodiment, see Figure 6 The short message device includes a controller, a baseband chip, a positioning module, a physical button module and an antenna circuit provided in any of the above embodiments. The baseband chip, the positioning module and the physical button module are all connected to the controller. The antenna circuit is connected to the baseband chip.

[0099] The positioning module is used to send the collected location information to the controller, so that the controller transmits a short message carrying the location information via the baseband chip through the first antenna or the second antenna.

[0100] The battery is used to power the short message device when some of the short message device is removed from the vehicle. When some of the short message device is not removed from the vehicle, the battery of the vehicle powers the short message device. In one example, the battery may be a nickel-hydrogen battery.

[0101] It should be noted that the partial devices of the short message device include all devices except the second antenna disposed in the short message device.

[0102] The short message device is connected to the center console of the vehicle through the CAN network. When some devices of the short message device are not removed from the vehicle, the short message device is triggered to send a short message by triggering the center console. When some devices of the short message device are removed from the vehicle, the short message device is triggered to send a short message through the physical button module.

[0103] In one embodiment of the utility model, the short message device further comprises a Bluetooth module. The Bluetooth module is connected to the controller. The Bluetooth module is used for, when the host is removed from the vehicle, the host establishes Bluetooth communication with the terminal device through the Bluetooth module, so that the terminal device sends the short message to the host through the Bluetooth communication.

[0104] When some devices of the short message device are not removed from the vehicle, the short message device can be controlled by triggering the center console interface. When some devices of the short message device are removed from the vehicle, a Bluetooth connection is established with the terminal device through the Bluetooth module, and the short message device can be controlled through the terminal device.

[0105] In one embodiment of the present invention, a vehicle is provided. Figure 7 As shown, the vehicle includes a short message device as provided in any of the above embodiments.

[0106] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. For the electric vehicle embodiment, its related parts can be referred to the partial description of the method embodiment.

[0107] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0108] The embodiments of the present specification may be systems, methods and / or computer program products. The computer program product may include a computer-readable storage medium carrying computer instructions for causing a processor to implement various aspects of the embodiments of the present specification.

[0109] The flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the systems, methods and computer program products according to the multiple embodiments of this specification. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a computer instruction, and a part of a module, a program segment or a computer instruction contains one or more executable computer instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or the flowchart, and the combination of the boxes in the block diagram and / or the flowchart can be implemented by a dedicated hardware-based system that performs the specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions. It is well known to those skilled in the art that it is equivalent to implement it by hardware, implement it by software, and implement it by combining software and hardware.

[0110] The embodiments of the present specification have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An antenna circuit, characterized in that: It includes a first antenna, a second antenna and a signal transmission circuit; wherein, The first antenna and the signal transmission circuit form an onboard antenna circuit when the first antenna and the signal transmission circuit are removed from the vehicle; The second antenna and the signal transmission circuit form a vehicle-mounted antenna circuit when the first antenna and the signal transmission circuit are not removed from the vehicle.

2. The antenna circuit according to claim 1, characterized in that: The antenna circuit also includes a first RF connector with a switching switch; wherein, The first radio frequency connector is used to switch the connection between the first antenna and the second antenna and the signal transmission circuit.

3. The antenna circuit according to claim 2, characterized in that: When the first antenna and the signal transmission circuit are removed from the vehicle, the switch of the first RF connector is used to switch the connection between the second antenna and the signal transmission circuit to the connection between the first antenna and the signal transmission circuit.

4. The antenna circuit according to claim 1, characterized in that: The signal transmission circuit includes an amplifier circuit on a signal transmission link and an amplifier circuit on a signal receiving link; wherein, The amplifying circuit on the signal transmitting link is connected to the output end of the first antenna or the second antenna, and the amplifying circuit on the signal receiving link is connected to the input end of the first antenna or the second antenna.

5. The antenna circuit according to claim 4, characterized in that: The amplifying circuit on the signal transmission link includes a preamplifier, a power amplifier, and a first filter; wherein, The first end of the preamplifier is connected to the output end of the baseband chip, the second end of the preamplifier is connected to the first end of the power amplifier, the second end of the power amplifier is connected to the first end of the first filter, and the second end of the first filter can be switchably connected to the output end of the first antenna and the output end of the second antenna.

6. The antenna circuit according to claim 4, characterized in that: The amplification circuit on the signal receiving link includes a low noise amplifier and two second filters; wherein, The first end of the first second filter can be switchably connected to the input ends of the first antenna and the second antenna, the first end of the first second filter is connected to the first end of the low noise amplifier, the second end of the low noise amplifier is connected to the first end of the second second filter, and the second end of the second second filter is connected to the input end of the baseband chip.

7. The antenna circuit according to claim 1, characterized in that: The antenna circuit includes a second RF connector and a first RF switch; wherein, In a case where the first antenna and the signal transmission circuit form an airborne antenna circuit, the first end of the first radio frequency switch is connected to the signal transmission circuit, and the second end of the first radio frequency switch is switched to be connected to the first antenna; When the second antenna and the signal transmission circuit form a vehicle-mounted antenna circuit, the first end of the first RF switch is connected to the signal transmission circuit, the second end of the first RF switch is switched to be connected to the first end of the second RF connector, and the second end of the second RF connector is connected to the second antenna.

8. The antenna circuit according to any one of claims 1 to 7, characterized in that: The first antenna and the second antenna are both passive antennas.

9. The antenna circuit according to claim 1, characterized in that: The first antenna and the second antenna are both active antennas, and the signal transmission circuit includes a first signal transmission circuit and a second signal transmission circuit; The first antenna and the first signal transmission circuit form an onboard antenna circuit when the first antenna and the first signal transmission circuit are removed from the vehicle; When the first antenna and the first signal transmission circuit are not removed from the vehicle, the second antenna and the second signal transmission circuit form a vehicle-mounted antenna circuit.

10. The antenna circuit according to claim 9, characterized in that: The first signal transmission circuit and the second signal transmission circuit both include an amplifier circuit on a signal transmission link and an amplifier circuit on a signal reception link; wherein, The amplifier circuit on the signal transmission link of the first signal transmission circuit is connected to the output end of the first antenna, and the amplifier circuit on the signal reception link of the first signal transmission circuit is connected to the input end of the first antenna; The amplifier circuit on the signal transmission link of the second signal transmission circuit is connected to the output end of the second antenna, and the amplifier circuit on the signal reception link of the second signal transmission circuit is connected to the input end of the second antenna.

11. The antenna circuit according to claim 9 or 10, characterized in that: The antenna circuit also includes a second radio frequency switch; wherein, A first end of the second RF switch is connected to the baseband chip, and a second end of the second RF switch can be switched to be connected to the first signal transmission circuit and the second signal transmission circuit.

12. A short message device, characterized in that: The invention comprises the antenna circuit as claimed in any one of claims 1 to 11.

13. The short message device according to claim 12, characterized in that: The short message device also includes a controller, a baseband chip, a positioning module, and a physical button module; wherein, The baseband chip, the positioning module and the physical button module are all connected to the controller, and the signal transmission circuit is connected to the baseband chip.

14. The short message device according to claim 13, characterized in that: The short message device also includes a Bluetooth module; wherein, The Bluetooth module is connected to the controller; The Bluetooth module is used for establishing Bluetooth communication with a terminal device through the host when the host is removed from the vehicle, so that the terminal device sends a short message to the host through the Bluetooth communication.

15. A vehicle, characterized in that: Comprising a short message device as described in any one of claims 12-14.

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