Antenna state detection circuit

Abstract

The utility model relates to an antenna state detection circuit. The circuit comprises a first resistor, an inductor, a first capacitor, a second resistor and an antenna assembly, the first end of the first resistor is used for accessing detection voltage, and the second end of the first resistor is connected with the first end of the inductor and used for being connected with a voltage sampling device; the second end of the inductor is connected with the second end of the first capacitor, the first end of the second resistor and the first end of the antenna assembly, the first end of the first capacitor is used for connecting a radio frequency signal, the second end of the second resistor is grounded, and the second end of the antenna assembly is grounded. The circuit can accurately detect the state of the antenna.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antennas, in particular to an antenna state detection circuit. BACKGROUND

[0002] Generally, the antenna state includes short circuit, open circuit and antenna connection, and the antenna state is currently detected by two ways of detecting the standing wave at the detection interface and applying a direct current detection voltage of an isolated radio frequency signal at the antenna port.

[0003] When the radio frequency signal is transmitted on the transmission line, if impedance transformation occurs, the reflection signal and the transmission signal superimpose, and a certain standing wave will be generated. The matching state of the antenna can be measured by the size of the standing wave. In order to not affect the quality of the radio frequency signal on the transmission line, a parallel coupler is usually used to couple the signal out to the standing wave detection circuit for judgment, but the cost of this way of detecting the standing wave at the detection interface is high due to the complex circuit architecture.

[0004] And the way of applying a direct current detection voltage of an isolated radio frequency signal at the antenna port is to judge the antenna state by collecting the voltage state, but the voltage detected by the antenna open circuit and the antenna inductance open circuit is the same, so it is impossible to distinguish whether the antenna is open circuit or inductance open circuit, resulting in low accuracy of the antenna state detection. CONTENT OF THE INVENTION

[0005] Therefore, it is necessary to provide an antenna state detection circuit capable of accurately detecting the antenna state in view of the above technical problems.

[0006] An antenna state detection circuit, the circuit comprising a first resistor, an inductor, a first capacitor, a second resistor and an antenna assembly, wherein: a first end of the first resistor is used for connecting a detection voltage, a second end of the first resistor is connected with a first end of the inductor and used for connecting a voltage sampling device, a second end of the inductor is connected with a second end of the first capacitor, a first end of the antenna assembly and a first end of the second resistor respectively, a first end of the first capacitor is used for connecting a radio frequency signal, a second end of the second resistor is grounded, and a second end of the antenna assembly is grounded.

[0007] In one of the embodiments, the antenna assembly comprises a blocking-straight unit and an antenna, wherein:

[0008] The second end of the inductor is connected with a first end of the blocking-straight unit;

[0009] A second end of the blocking-straight unit is connected with the antenna;

[0010] The second end of the blocking-straight unit is grounded.

[0011] In one of the embodiments, the blocking-straight unit comprises a third resistor and a second capacitor, wherein:

[0012] The second end of the inductor is connected to the first end of the third resistor and the first end of the second capacitor respectively;

[0013] The second end of the third resistor is grounded;

[0014] The second end of the second capacitor is connected to the antenna.

[0015] In one of the embodiments, the type of the antenna assembly is one of a dipole antenna, a monopole antenna, a loop antenna and an IFA antenna.

[0016] In one of the embodiments, the state of the antenna assembly is one of an open antenna, a shorted antenna, a connected antenna and an inductive open antenna.

[0017] In one of the embodiments, the circuit further comprises a radio frequency signal receiving assembly, wherein:

[0018] The first end of the first capacitor is connected to the radio frequency signal receiving assembly, and the radio frequency signal receiving assembly is used to receive a radio frequency signal.

[0019] In one of the embodiments, the circuit further comprises a voltage sampling device, wherein:

[0020] The second end of the first resistor is connected to the voltage sampling device.

[0021] In one of the embodiments, the circuit further comprises a detection voltage source, wherein:

[0022] The first end of the first resistor is connected to the detection voltage source.

[0023] A vehicle-mounted remote communication terminal, the vehicle-mounted remote communication terminal is configured with the antenna state detection circuit of any one of the above.

[0024] A vehicle, the vehicle is configured with a vehicle-mounted remote communication terminal.

[0025] The antenna state detection circuit comprises a first resistor, an inductor, a first capacitor, a second resistor and an antenna assembly, wherein: the first end of the first resistor is used to access a detection voltage, the second end of the first resistor is connected to the first end of the inductor and is used to connect a voltage sampling device, the second end of the inductor is connected to the second end of the first capacitor, the first end of the second resistor and the first end of the antenna assembly respectively, the first end of the first capacitor is used to connect a radio frequency signal, the second end of the second resistor is grounded, and the second end of the antenna assembly is grounded.

[0026] Therefore, by adding the second resistor for voltage division, the voltage detected by the voltage sampling device can realize the state monitoring of the antenna, and the voltages corresponding to different antenna states are different, so that it can be accurately distinguished whether the antenna is open or inductive open, thereby improving the accuracy of antenna state detection. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 This is a circuit connection diagram of the antenna state detection circuit in one embodiment;

[0028] Figure 2 This is a circuit connection diagram of the antenna state detection circuit in one embodiment;

[0029] Figure 3 This is a circuit connection diagram of the antenna state detection circuit in one embodiment;

[0030] Figure 4 This is a circuit connection diagram of an antenna assembly in one embodiment;

[0031] Figure 5 This is a circuit connection diagram of an antenna assembly in one embodiment. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0033] It should be noted that, in the description of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. The terms "first," "second," etc., in this application are used to distinguish similar objects and are not used to describe a specific order or sequence.

[0034] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0035] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] In one embodiment, such as Figure 1As shown, an antenna state detection circuit 100 is provided, comprising a first resistor 102, an inductor 104, a first capacitor 106, a second resistor 108 and an antenna component 110, wherein: a first end of the first resistor 102 is used for connecting a detection voltage, a second end of the first resistor 102 is connected with a first end of the inductor 104 and is used for connecting a voltage sampling device, a second end of the inductor 104 is connected with a second end of the first capacitor 106, a first end of the second resistor 108 and a first end of the antenna component 110 respectively, a first end of the first capacitor 106 is used for connecting a radio frequency signal, a second end of the second resistor 108 is grounded, and a second end of the antenna component 110 is grounded.

[0037] Wherein, the first end of the first resistor 102 is used for connecting a detection voltage, the detection voltage ensures the circuit to start working, the second end of the first resistor 102 is connected with the first end of the inductor 104 and is used for connecting a voltage sampling device, the voltage sampling device is used for detecting the voltage under the state of different antenna components 110. And the second end of the inductor 104 is connected with the second end of the first capacitor 106, the first end of the second resistor 108 and the first end of the antenna component 110 respectively.

[0038] Wherein, the main functions of the inductor 104 include blocking alternating current, passing direct current, filtering, oscillation, tuning and frequency selection, energy storage, delay and wave trapping, current limiting, signal selection and separation, and impedance matching.

[0039] Wherein, the first capacitor 106 is used for passing radio frequency signals and blocking direct current, that is, radio frequency signals can pass through the first capacitor 106, but direct current cannot pass through the first capacitor 106.

[0040] Wherein, the second resistor 108 is used for voltage division and belongs to voltage dividing resistor, the first end of which is connected with the second end of the inductor 104, and the second end of which is grounded.

[0041] Wherein, the second end of the antenna component 110 is grounded and is used for receiving signals, and the state of the antenna component 110 directly affects the use of signals.

[0042] Specifically, when the state of the antenna component 110 is open circuit, the voltage detected by the voltage sampling device is:

[0043]

[0044] Wherein, v is the detection voltage, R2 is the second resistor, and R1 is the first resistor.

[0045] Wherein, when the state of the antenna component 110 is normal, the voltage detected by the voltage sampling device is:

[0046]

[0047] Wherein, v is the detection voltage, R2 is the second resistance, R1 is the first resistance, and R3 is the third resistance.

[0048] Wherein, when the state of the antenna assembly 110 is short-circuit, the voltage detected by the voltage sampling device is 0.

[0049] Wherein, when the state of the inductor 104 is open-circuit, the voltage detected by the voltage sampling device is the detection voltage v.

[0050] Therefore, by increasing the second resistance for voltage division, the open-circuit of the inductor and the open-circuit of the antenna assembly can be distinguished, and the four-state monitoring of the antenna state is truly realized, specifically: antenna open-circuit, antenna short-circuit, antenna connection, and antenna inductor open-circuit.

[0051] The above antenna state detection circuit includes a first resistance, an inductor, a first capacitor, a second resistance, and an antenna assembly, wherein: the first end of the first resistance is used to access the detection voltage, the second end of the first resistance is connected with the first end of the inductor and used to connect the voltage sampling device, the second end of the inductor is connected with the second end of the first capacitor, the first end of the second resistance, and the first end of the antenna assembly respectively, the first end of the first capacitor is used to connect the radio frequency signal, the second end of the second resistance is grounded, and the second end of the antenna assembly is grounded.

[0052] Therefore, by increasing the second resistance for voltage division, the open-circuit of the inductor and the open-circuit of the antenna assembly can be distinguished, and the four-state monitoring of the antenna state is truly realized, specifically: antenna open-circuit, antenna short-circuit, antenna connection, and antenna inductor open-circuit.

[0053] In one embodiment, as shown in Figure 2 The antenna assembly 110 includes a blocking direct unit 1102 and an antenna 1104, wherein: the second end of the inductor 104 is connected with the first end of the blocking direct unit 1102, the second end of the blocking direct unit 1102 is connected with the antenna 1104, and the second end of the blocking direct unit 1102 is grounded.

[0054] Wherein, since the antenna includes multiple types, any type of antenna is designed as an antenna with a limited direct current resistance, specifically, the blocking direct unit 1102 realizes isolation of the detected direct current signal and does not affect the radio frequency performance and characteristic impedance of the antenna.

[0055] Specifically, as shown in Figure 2 The antenna assembly 110 includes a blocking direct unit 1102 and an antenna 1104, wherein: the second end of the inductor 104 is connected with the first end of the blocking direct unit 1102, the second end of the blocking direct unit 1102 is connected with the antenna 1104, and the second end of the blocking direct unit 1102 is grounded.

[0056] In one embodiment, as shown in Figure 3As shown, the blocking unit 1102 includes a third resistor 11022 and a second capacitor 11024, wherein the second end of the inductor 104 is connected to the first end of the third resistor 11022 and the first end of the second capacitor 11024 respectively, the second end of the third resistor 11022 is grounded, and the second end of the second capacitor 11024 is connected to the antenna 1104.

[0057] As shown, the blocking unit 1102 includes a third resistor 11022 and a second capacitor 11024, wherein the second end of the inductor 104 is connected to the first end of the third resistor 11022 and the first end of the second capacitor 11024 respectively, the second end of the third resistor 11022 is grounded, and the second end of the second capacitor 11024 is connected to the antenna 1104.

[0058] In one embodiment, the type of the antenna assembly is one of a dipole antenna, a monopole antenna, a loop antenna, and an IFA antenna.

[0059] In one embodiment, the type of the antenna assembly is one of a dipole antenna, a monopole antenna, a loop antenna, and an IFA antenna.

[0060] In one embodiment, the type of the antenna assembly is one of a dipole antenna, a monopole antenna, a loop antenna, and an IFA antenna.

[0061] In one embodiment, the type of the antenna assembly is one of a dipole antenna, a monopole antenna, a loop antenna, and an IFA antenna.

[0062] In one embodiment, the type of the antenna assembly is one of a dipole antenna, a monopole antenna, a loop antenna, and an IFA antenna.

[0063] In one embodiment, the type of the antenna assembly is one of a dipole antenna, a monopole antenna, a loop antenna, and an IFA antenna.

[0064] In one embodiment, the type of the antenna assembly is one of a dipole antenna, a monopole antenna, a loop antenna, and an IFA antenna. Figure 4 As shown, the connection structure of the antenna assembly of the dipole antenna or the monopole antenna is as shown in Figure 5 As shown, the connection structure of the antenna assembly of the loop antenna and the IFA antenna is as shown in

[0065] In one embodiment, the state of the antenna assembly is one of an open antenna, a shorted antenna, an on antenna, and an inductive open antenna.

[0066] In one embodiment, the circuit further comprises a radio frequency signal receiving component, and the first end of the first capacitor 106 is connected to the radio frequency signal receiving component, which is configured to receive a radio frequency signal.

[0067] In one embodiment, the circuit further comprises a voltage sampling device, and the second end of the first resistor 102 is connected to the voltage sampling device.

[0068] In one embodiment, the circuit further comprises a detection voltage source, and the first end of the first resistor 102 is connected to the detection voltage source.

[0069] In one embodiment, the circuit further comprises a radio frequency signal receiving component, and the first end of the first capacitor 106 is connected to the radio frequency signal receiving component, which is configured to receive a radio frequency signal, and the first capacitor 106 can pass the radio frequency signal but not the direct current.

[0070] In one embodiment, the circuit further comprises a voltage sampling device and a detection voltage source, and the first end of the first resistor 102 is connected to the detection voltage source to receive a detection voltage to enable the normal operation of the circuit, and the second end of the first resistor 102 is connected to the voltage sampling device to detect the voltage and determine the state of the antenna assembly 110 by sampling the voltage.

[0071] A vehicle-mounted remote communication terminal, which is configured with the antenna state detection circuit according to any one of the above embodiments.

[0072] In one embodiment, the vehicle-mounted remote communication terminal can be a vehicle-mounted T-BOX (Telematics BOX, referred to as a vehicle-mounted T-BOX), and the Internet of Vehicles system includes four parts, a host, a vehicle-mounted T-BOX, a mobile phone APP, and a background system. The host is mainly used for in-vehicle audio and video entertainment and vehicle information display; the vehicle-mounted T-BOX is mainly used for communication with the background system / mobile phone application to realize the display and control of vehicle information by the mobile phone application.

[0073] A vehicle, which is configured with the vehicle-mounted remote communication terminal according to the above embodiments.

[0074] The technical features of the above embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present disclosure.

[0075] The above embodiments only express several implementation manners of the application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the utility model patent. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the application, a number of modifications and improvements can be made, which all belong to the protection scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.

Claims

1. An antenna state detection circuit, characterized by, The circuit comprises a first resistor, an inductor, a first capacitor, a second resistor and an antenna component, wherein: a first end of the first resistor is used for accessing a detection voltage, and a second end of the first resistor is connected with a first end of the inductor and used for connecting a voltage sampling device; a second end of the inductor is connected with a second end of the first capacitor, a first end of the second resistor and a first end of the antenna component respectively; a first end of the first capacitor is used for turning on a radio frequency signal; a second end of the second resistor is grounded, and a second end of the antenna component is grounded.

2. The circuit of claim 1, wherein, The antenna component comprises a blocking direct unit and an antenna, wherein: a second end of the inductor is connected with a first end of the blocking direct unit; a second end of the blocking direct unit is connected with the antenna; a second end of the blocking direct unit is grounded.

3. The circuit of claim 2, wherein, The blocking direct unit comprises a third resistor and a second capacitor, wherein: a second end of the inductor is connected with a first end of the third resistor and a first end of the second capacitor respectively; a second end of the third resistor is grounded; a second end of the second capacitor is connected with the antenna.

4. The circuit of claim 2 or 3, characterized in that, The antenna component is one of a dipole antenna, a monopole antenna, a loop antenna and an IFA antenna.

5. The circuit of claim 2 or 3, wherein, The state of the antenna component is one of an open circuit of the antenna, a short circuit of the antenna, a turn-on of the antenna and an open circuit of an inductor of the antenna.

6. The circuit of claim 1, wherein, The circuit further comprises a radio frequency signal receiving component, wherein: a first end of the first capacitor is connected with the radio frequency signal receiving component, and the radio frequency signal receiving component is used for receiving the radio frequency signal.

7. The circuit of claim 1, wherein, The circuit further comprises a voltage sampling device, wherein: a second end of the first resistor is connected with the voltage sampling device.

8. The circuit of claim 1, wherein, The circuit further comprises a detection voltage source, wherein: a first end of the first resistor is connected with the detection voltage source.

9. A vehicle-mounted remote communication terminal characterized by comprising: The vehicle-mounted remote communication terminal is configured with the antenna state detection circuit according to any one of claims 1-8.

10. A vehicle characterized by comprising: The vehicle is configured with the vehicle-mounted remote communication terminal according to claim 9.

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