Antenna tuning circuit, antenna tuning module, antenna module and electronic device
Patent Information
- Application Number
- CN202522457152.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-19
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-11-19
AI Technical Summary
[0004]然而，由于天线的输入阻抗会随着天线的工作频率持续变化，那么采用相关技术中的方法，需要人工不断调整天线的几何结构，导致调节天线的输入阻抗的效率较低
[0010]根据本实用新型的天线调谐电路，可以基于天线的工作频率实时感知天线的输入阻抗，并将天线的输入阻抗的电阻分量自适应调整到标准阻抗值，同时使天线的输入阻抗呈纯阻性，从而，提高了调整天线的输入阻抗的灵活性；此外，无需人工调整天线的几何结构，降低了人工成本，从而，提高了调整天线的输入阻抗的效率。
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Figure CN224843763U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of antenna technology, specifically relating to an antenna tuning circuit, an antenna tuning module, an antenna module, and electronic equipment. Background Technology
[0002] In wireless communication systems, the energy conversion efficiency is highest when the antenna's input impedance is equal to the standard impedance value. However, when the antenna's input impedance is not equal to the standard impedance value, some radio signals are reflected by the antenna, reducing the effective radiated power and resulting in lower energy conversion efficiency, which in turn degrades communication quality. Therefore, to ensure high energy conversion efficiency in wireless communication systems, it is necessary to adjust the antenna's input impedance to match the standard impedance value.
[0003] In related technologies, engineers can adjust the input impedance of an antenna by changing its geometry (such as antenna length), thereby making the antenna's input impedance equal to the standard impedance value.
[0004] However, since the input impedance of an antenna changes continuously with its operating frequency, the methods used in related technologies require manual adjustment of the antenna's geometry, resulting in low efficiency in adjusting the antenna's input impedance. Utility Model Content
[0005] This invention aims to solve at least one of the technical problems in the related art. Therefore, the first objective of this invention is to provide an antenna tuning circuit that can adaptively adjust the antenna's input impedance to a standard impedance value when the antenna's operating frequency changes, causing a change in the antenna's input impedance. This makes the antenna's input impedance purely resistive, improving the flexibility of adjusting the antenna's input impedance. Furthermore, it eliminates the need for manual adjustment of the antenna's geometry, reducing labor costs and thus improving the efficiency of adjusting the antenna's input impedance.
[0006] The second objective of this invention is to provide an antenna tuning module.
[0007] The third objective of this invention is to propose an antenna module.
[0008] The fourth objective of this invention is to provide an electronic device.
[0009] To achieve the above objectives, the first aspect of this utility model provides an antenna tuning circuit, comprising: a resistance adjustment circuit and a reactance cancellation circuit; The resistor adjustment circuit and the reactance cancellation circuit are connected in parallel and then connected to the antenna. The resistor adjustment circuit is used to adjust the resistance component in the input impedance of the antenna so that the adjusted resistance component is equal to the standard impedance value of the antenna. The reactance cancellation circuit is used to cancel the reactance component in the input impedance of the antenna.
[0010] According to the antenna tuning circuit of this utility model, the input impedance of the antenna can be sensed in real time based on the antenna's operating frequency, and the resistive component of the antenna's input impedance can be adaptively adjusted to the standard impedance value. At the same time, the input impedance of the antenna is purely resistive, thereby improving the flexibility of adjusting the antenna's input impedance. In addition, there is no need to manually adjust the antenna's geometry, reducing labor costs and thus improving the efficiency of adjusting the antenna's input impedance.
[0011] According to one embodiment of the present invention, the resistance adjustment circuit includes at least one first tuning switch circuit, and the reactance cancellation circuit includes at least one second tuning switch circuit.
[0012] According to one embodiment of the present invention, at least one first tuning switch circuit is provided, and the plurality of first tuning switch circuits are connected in parallel; at least one second tuning switch circuit is provided, and the plurality of second tuning switch circuits are connected in series.
[0013] According to one embodiment of the present invention, at least one target first tuning switch circuit in the first tuning switch circuit is used to adjust the resistance component in the input impedance of the antenna so that the adjusted resistance component is equal to the standard impedance value of the antenna. At least one target second tuning switch circuit in the second tuning switch circuit is used to cancel the reactive component in the input impedance of the antenna.
[0014] According to one embodiment of the present invention, each first tuning switch circuit includes: a first switching chip and at least one first impedance adjustment element; the first switching chip is connected in parallel with the reactance cancellation circuit through at least one first impedance adjustment element; the first switching chip in the target first tuning switch circuit is used to select and connect to the target first impedance adjustment element in the target first tuning switch circuit based on the resistance change of the resistance component and the standard impedance value.
[0015] According to one embodiment of the present invention, the first switch chip has: at least one first radio frequency port; each of the first impedance adjustment elements includes at least one capacitor; wherein each of the first radio frequency ports is connected to at least one of the capacitors.
[0016] According to one embodiment of the present invention, each second tuning switch circuit includes: a second switching chip and at least one second impedance adjustment element; the second switching chip and at least one second impedance adjustment element are connected in parallel and then connected to the antenna; the second switching chip in the target second tuning switch circuit is used to select and connect to the target second impedance adjustment element in the target second tuning switch circuit based on the reactance component.
[0017] According to one embodiment of the present invention, the second switching chip has: a radio frequency common port and at least one second radio frequency port; each second impedance adjustment element includes at least one inductor; wherein the radio frequency common port is connected to a target terminal and one end of the corresponding at least one inductor, and each second radio frequency port is connected to the other end of the corresponding at least one inductor; the target terminal is a ground terminal, or the target terminal is a target second radio frequency port of the previous second switching chip.
[0018] To achieve the above objectives, the second aspect of this utility model provides an antenna tuning module, including: an impedance matching circuit, a radio frequency transceiver circuit, and an antenna tuning circuit as described in the first aspect. The antenna tuning circuit is connected to the antenna, and the radio frequency transceiver circuit is connected to the antenna after being connected in series with the impedance matching circuit.
[0019] According to the antenna tuning module of this utility model, by adopting the above-mentioned antenna tuning circuit, the input impedance of the antenna can be sensed in real time based on the antenna's operating frequency, and the resistive component of the antenna's input impedance can be adaptively adjusted to the standard impedance value. At the same time, the input impedance of the antenna is purely resistive, which improves the flexibility of adjusting the antenna's input impedance. Furthermore, it eliminates the need for manual adjustment of the antenna's geometry, reducing labor costs and thus improving the efficiency of adjusting the antenna's input impedance.
[0020] To achieve the above objectives, a third aspect of this utility model provides an antenna module, comprising: an antenna, and an antenna tuning module as described in the second aspect; The antenna has a tuning feed point, an RF feed point, and a ground feed point; The tuning feed point is connected to the antenna tuning circuit in the antenna tuning module. The RF feed point is connected to the impedance matching circuit in the antenna tuning module.
[0021] According to the antenna module of this utility model, by adopting the above-mentioned antenna tuning module, the antenna input impedance can be adaptively adjusted to a standard impedance value when the antenna's operating frequency changes, causing the antenna's input impedance to change. This makes the antenna's input impedance purely resistive, improving the flexibility of adjusting the antenna's input impedance. Furthermore, it eliminates the need for manual adjustment of the antenna's geometry, reducing labor costs and thus improving the efficiency of adjusting the antenna's input impedance.
[0022] To achieve the above objectives, the fourth aspect of this utility model provides an electronic device, comprising: an electronic device body, and an antenna module as described in the third aspect.
[0023] According to the electronic device of this utility model, by adopting the above-mentioned antenna module, the input impedance of the antenna can be adaptively adjusted to a standard impedance value when the input impedance of the antenna changes due to the change of the antenna's operating frequency, and the input impedance of the antenna is purely resistive. This improves the flexibility of adjusting the input impedance of the antenna, and eliminates the need for manual adjustment of the antenna's geometry, reducing labor costs and thus improving the efficiency of adjusting the input impedance of the antenna.
[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description
[0025] Figure 1 A schematic diagram of an antenna tuning circuit provided in one embodiment of this utility model; Figure 2 A schematic diagram of another antenna tuning circuit provided in one embodiment of this utility model; Figure 3 This is a schematic diagram of another antenna tuning circuit provided in one embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of another antenna tuning circuit provided in one embodiment of the present invention; Figure 5 A schematic diagram of the structure of an antenna tuning module provided in one embodiment of this utility model; Figure 6 A schematic diagram of an impedance matching circuit provided for one embodiment of this utility model; Figure 7 This is a schematic diagram of the structure of an antenna module provided in one embodiment of the present invention; Figure 8 This is a structural block diagram of an electronic device provided in one embodiment of the present invention. Detailed Implementation
[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.
[0027] The antenna tuning circuit, antenna tuning module, antenna module, and electronic equipment of the present invention are described below with reference to the accompanying drawings.
[0028] Figure 1 This is a schematic diagram of an antenna tuning circuit provided in one embodiment of the present invention. Figure 1 As shown, the antenna tuning circuit 100 includes a resistance adjustment circuit 10 and a reactance cancellation circuit 20.
[0029] The resistor adjustment circuit 10 and the reactance cancellation circuit 20 are connected in parallel and then connected to the antenna 30. The resistor adjustment circuit 10 is used to adjust the resistance component in the input impedance of the antenna 30 so that the adjusted resistance component is equal to the standard impedance value of the antenna 30. The reactance cancellation circuit 20 is used to cancel the reactance component in the input impedance of the antenna 30.
[0030] The input impedance of antenna 30 is in complex form, containing a real part and an imaginary part. The real part is the resistive component, and the imaginary part is the reactive component. The reactive component of the standard impedance value is 0, and the resistive component is the standard resistance value. For example, the standard resistance value can be 50 ohms (Ω).
[0031] Specifically, antenna 30 is used to convert received radio signals into electromagnetic waves that propagate in an unbounded medium (typically free space), and to convert electromagnetic waves propagating in an unbounded medium into radio signals that propagate on a transmission line. For example, the transmission line can be a connection line between antenna 30 and an RF transceiver circuit for transmitting radio signals. The input impedance of antenna 30 varies with its operating frequency. Assuming antenna 30 covers the 2.4 GHz band, its operating frequency can be any frequency point within the 2.4 GHz band, and its input impedance will exhibit different values at different frequencies within the 2.4 GHz band. When the operating frequency of antenna 30 is at its resonant frequency, its input impedance equals the standard impedance value, indicating that antenna 30 is in its optimal energy transmission state with high energy transmission efficiency. If the input impedance of antenna 30 does not equal the standard impedance value, some radio signals will be reflected by antenna 30, resulting in lower energy transmission efficiency.
[0032] The resistance adjustment circuit 10 is used to adjust the resistance component of the input impedance of the antenna 30 to the standard impedance value, so that the adjusted resistance component is equal to the standard resistance value in the standard impedance value. The reactance cancellation circuit 20 is used to cancel the reactance component of the input impedance of the antenna 30, so that the reactance component in the adjusted input impedance is 0.
[0033] The input impedance is adjusted by the resistor adjustment circuit 10 and the reactance cancellation circuit 20 so that the adjusted input impedance is equal to the standard resistance value in the standard impedance value, that is, the adjusted input impedance is purely resistive.
[0034] Furthermore, when the resistive component of the input impedance is less than the standard impedance value, the resistance adjustment circuit 10 is used to increase the resistive component of the input impedance of the antenna 30 to the standard impedance value; when the resistive component of the input impedance is greater than the standard impedance value, the resistance adjustment circuit 10 is used to decrease the resistive component of the input impedance of the antenna 30 to the standard impedance value.
[0035] It should be noted that when the reactance component of the input impedance is negative, the reactance is capacitive, and antenna 30 is capacitive; when the reactance component of the input impedance is positive, the reactance is inductive, and antenna 30 is inductive. When antenna 30 is capacitive, the reactance cancellation circuit 20 cancels the capacitive reactance of the input impedance of antenna 30, making the input impedance purely resistive. When antenna 30 is inductive, the reactance cancellation circuit 20 cancels the inductive reactance of the input impedance of antenna 30, making the input impedance purely resistive.
[0036] In the above embodiments, the resistance adjustment circuit is used to adjust the resistive component of the antenna's input impedance to a standard impedance value, so that the adjusted resistance component is equal to the standard resistance value in the standard impedance value. The reactance cancellation circuit is used to cancel the reactance of the antenna's input impedance. Therefore, by adjusting the input impedance through the resistance adjustment circuit and the reactance cancellation circuit, the adjusted input impedance is equal to the standard impedance value, that is, the adjusted input impedance is purely resistive. Thus, when the antenna's operating frequency changes, causing a change in the antenna's input impedance, the antenna tuning circuit provided by this invention can adaptively adjust the antenna's input impedance to a standard impedance value and make the antenna's input impedance purely resistive. This improves the flexibility of adjusting the antenna's input impedance and eliminates the need for manual adjustment of the antenna's geometry, reducing labor costs and thereby improving the efficiency of adjusting the antenna's input impedance.
[0037] Figure 2 This is a schematic diagram of another antenna tuning circuit provided in one embodiment of the present invention. Figure 2 As shown, the resistance adjustment circuit 10 may include at least one first tuning switch circuit 101, and the reactance cancellation circuit 20 may include at least one second tuning switch circuit 201.
[0038] Furthermore, such as Figure 2 As shown, when there are multiple first tuning switch circuits 101, the multiple first tuning switch circuits 101 are connected in parallel; when there are multiple second tuning switch circuits 201, the multiple second tuning switch circuits 201 are connected in series. Figure 2 The example is illustrated by two parallel first tuning switch circuits 101 and two series second tuning switch circuits 201.
[0039] At least one first tuning switch circuit 101 is a target first tuning switch circuit used to adjust the resistive component in the input impedance of the antenna 30 so that the adjusted resistive component is equal to the standard impedance value of the antenna 30; at least one second tuning switch circuit 201 is a target second tuning switch circuit used to cancel the reactive component in the input impedance of the antenna 30.
[0040] Where at least one first tuning switch circuit 101 is present, the target first tuning switch circuit is that first tuning switch circuit 101; where at least one first tuning switch circuit is present, the target first tuning switch circuit is at least one of the multiple first tuning switch circuits 101. Where at least one second tuning switch circuit 201 is present, the target second tuning switch circuit is that second tuning switch circuit 201; where at least one second tuning switch circuit is present, the target second tuning switch circuit is at least one of the multiple second tuning switch circuits 201.
[0041] Specifically, for different input impedances of antenna 30, the resistance change between the resistance component of the input impedance and the standard impedance value is different. At least one target first tuning switch circuit in the first tuning switch circuit 101 is used to adjust the resistance change of the resistance component of the different input impedances so that the resistance component of the adjusted input impedance is equal to the standard impedance value.
[0042] For antenna 30 with different input impedances and different reactance components, at least one second tuning switch circuit in the second tuning switch circuit 201 is used to cancel the reactance components of the different input impedances so that the reactance component in the canceled input impedance is 0.
[0043] Figure 3 This is a schematic diagram of another antenna tuning circuit provided in one embodiment of the present invention. Figure 2 and 3As shown, in one embodiment, each first tuning switch circuit 101 includes a first switch chip 1011 and at least one first impedance adjustment element 1012. The first switch chip 1011 is connected in parallel with the reactance cancellation circuit 20 through at least one first impedance adjustment element 1012. The first switch chip 1011 in the target first tuning switch circuit is used to select and connect a target first impedance adjustment element in the target first tuning switch circuit based on the resistance change of the resistance component in the input impedance compared to the standard impedance value. (Reference) Figure 2 and Figure 3 , Figure 3 The example is shown by connecting the first switch chip 1011 in parallel with the reactance cancellation circuit 20 through two first impedance adjustment elements 1012.
[0044] The target first impedance adjustment element corresponds to different resistance changes. When the target first adjustment switch circuit includes one first impedance adjustment element 1012, the target first impedance adjustment element is the first impedance adjustment element 1012 in the target first adjustment switch circuit; when the target first adjustment switch circuit includes multiple first impedance adjustment elements 1012, the target first impedance adjustment element is at least one of the multiple first impedance adjustment elements 1012 in the target first adjustment switch circuit.
[0045] Specifically, the first impedance adjustment element 1012 can be a capacitor, an inductor, or a combination of capacitor and inductor, etc. In the combination of capacitor and inductor, the combination of capacitor and inductor can be a series combination, a parallel combination, a π-type combination, a T-type combination, or an L-type combination, etc.
[0046] like Figure 3 As shown, in one embodiment, each second tuning switch circuit 201 includes: a second switching chip 2011 and at least one second impedance adjustment element 2012; the second switching chip 2011 and the at least one second impedance adjustment element 2012 are connected in parallel and then connected to the antenna 30; the second switching chip 2011 in the target second tuning switch circuit is used to select and connect to the target second impedance adjustment element in the target second tuning switch circuit based on the reactance component in the input impedance. (Reference) Figure 2 and Figure 3 , Figure 3 The example is shown by connecting the second switch chip 2011 and two second impedance adjustment elements 2012 in parallel with the antenna 30.
[0047] The target second impedance adjustment element 2012 varies depending on the reactance component. When the target second adjustment switch circuit includes one second impedance adjustment element 2012, the target second impedance adjustment element is the second impedance adjustment element 2012 in that target second adjustment switch circuit; when the target second adjustment switch circuit includes multiple second impedance adjustment elements 2012, the target second impedance adjustment element is at least one of the multiple second impedance adjustment elements 2012 in that target second adjustment switch circuit. The second impedance adjustment element 2012 can also be a capacitor, an inductor, or a combination of capacitor and inductor, etc.
[0048] like Figure 4 As shown, in one embodiment, the first switch chip 1011 has at least one first radio frequency (RF) port, and each first impedance adjustment element 1012 includes at least one capacitor; wherein each first RF port is connected in series with at least one capacitor. Figure 4 The example illustrates a first switch chip 1011 having two first radio frequency ports (such as port RF1 and port RF2), and each first impedance adjustment element 1012 including a capacitor (such as first capacitor C1).
[0049] In addition, the first switch chip 1011 also has a first radio frequency common port, which is grounded. Figure 4 The example shown is a first switch chip 1011 with a first radio frequency common port (such as port RFC).
[0050] At least one first radio frequency port corresponds one-to-one with at least one first impedance adjustment element 1012. Furthermore, each first switch chip 1011 may also include a control unit. The control unit in the target first tuning switch circuit is used to control the conduction between the first radio frequency common port and the target first radio frequency port among the at least one first radio frequency port, so as to realize the selective access to the target first impedance adjustment element 1012.
[0051] Specifically, the target first RF port is connected to the target first impedance adjustment element. At least one of the first RF ports, excluding the target first RF port, is disconnected from the first RF common port.
[0052] The control unit in the target first tuning switch circuit is used to control the conduction between the first RF common port and the target first RF port among at least one first RF port under the control of the received control signal. This control signal can be a signal sent by the controller in conjunction with a 3 / 8 decoder. The controller can be a microcontroller.
[0053] Specifically, refer to Figure 4The first switch chip 1011 has a first radio frequency common port called the first radio frequency common port RFC. The two first radio frequency ports may include the first radio frequency port RF1 and the first radio frequency port RF2. The first radio frequency port RF2 is connected in series with the first capacitor C1, the first radio frequency port RF1 is connected in series with the second capacitor C2, and the first radio frequency common port RFC is grounded.
[0054] Furthermore, the first switch chip 1011 also has a voltage control (VCTL) port VCTL, a power supply voltage (VDD) port VDD, and a ground (GND) port GND. The VCTL port is connected to the controller and the control unit, respectively. The voltage control port VCTL in the target first tuning switch circuit is used to send the control signal received from the controller to the control unit in the target first tuning switch circuit. The power supply voltage port VDD is used to connect to the power supply and input the positive power supply voltage (Voltage Common Collector, VCC). The ground port GND is used for grounding.
[0055] Assuming the target's first tuning switch circuit is the first tuning switch circuit 201, the target's first RF port is the first RF port RF1, and the target's first impedance adjustment element is the second capacitor C2, refer to... Figure 3 and Figure 4 In the first tuning switch circuit 201, the control unit of the first switch chip 2011 can control the first radio frequency common port RFC and the first radio frequency port RF1 to be turned on under the control of the control signal received by the voltage control port VCTL, so as to select the second capacitor C2 to be connected.
[0056] Furthermore, when each first impedance adjustment element 1012 includes multiple capacitors, these multiple capacitors can be connected in parallel or in series.
[0057] like Figure 4 As shown, in one embodiment, the second switch chip 2011 has a second RF common port and at least one second RF port; each second impedance adjustment element 2012 includes at least one inductor; wherein the second RF common port is connected to a target terminal and one end of the corresponding at least one inductor, and each second RF port is connected to the other end of the corresponding at least one inductor; the target terminal is a ground terminal, or the target terminal is the target second RF port of the previous second switch chip. Figure 4 The example illustrates a second switch chip 2011 having a second RF common port (e.g., port RFC) and two second RF ports (e.g., port RF1 and port RF2), with each second impedance adjustment element 2012 including an inductor (e.g., a first inductor L1).
[0058] Specifically, at least one second RF port corresponds one-to-one with at least one second impedance adjustment element 2012, and when there is only one second RF port, the target second RF port is that one second RF port.
[0059] refer to Figure 3 and Figure 4 In the case where there is at least one second tuning switch circuit 201 and at least one second radio frequency port, the second radio frequency common port is connected to a ground terminal and one end of a second impedance adjustment element 2012, and the second radio frequency port is connected to the antenna 30 through the other end of the second impedance adjustment element 2012.
[0060] When there is at least one second tuning switch circuit 201 and at least one second RF port, the second RF common port of the second switch chip 2011 is connected to the ground terminal and one end of the first second impedance adjustment element 2012, respectively. The nth second RF port among the multiple second RF ports is connected to the other end of the nth second impedance adjustment element 2012 and one end of the (n+1)th second impedance adjustment element 2012, respectively. Here, n is a positive integer less than the total number of multiple second RF ports.
[0061] When there are multiple second tuning switch circuits 201 and at least one second RF port, the second RF common port of the first second switch chip 2011 is connected to a ground terminal and one end of a second impedance adjustment element 2012, respectively. A second RF port of the kth second switch chip 2011 is connected to the other end of a second impedance adjustment element 2012 and the second RF common port of the (k+1)th second switch chip 2011. Here, k is a positive integer less than the total number of the multiple second tuning switch circuits 201.
[0062] When there are multiple second tuning switch circuits 201 and multiple second RF ports, the second RF common port of the first second switch chip 2011 is connected to the ground terminal and one end of the first second impedance adjustment element 2012, respectively. The nth second RF port of each second switch chip 2011 is connected to the other end of the nth second impedance adjustment element 2012 and one end of the (n+1)th second impedance adjustment element 2012, respectively. The last second RF port of the jth second switch chip 2011 is also connected to the second RF common port of the (j+1)th second switch chip 2011. Here, j is a positive integer less than the total number of the multiple second RF ports.
[0063] Furthermore, each second switch chip 2011 may also include a control unit. In the case that at least one second RF port is available, the control unit in the target second tuning switch circuit is used to control the second RF common port to disconnect from the one second RF port in order to selectively access the second impedance adjustment element 2012.
[0064] The control unit in the target second tuning switch circuit can, under the control of the received control signal, control the disconnection between the second RF common port and the second RF port.
[0065] In the case where there are multiple second RF ports, the control unit in the target second tuning switch circuit is used to control the second RF common port to be disconnected from at least one second RF port, so as to realize access to all second impedance adjustment elements 2012 in at least one second impedance adjustment element 2012.
[0066] The control unit in the target second tuning switch circuit can, under the control of the received control signal, control the second RF common port to disconnect from at least one second RF port.
[0067] In the case where there are multiple second RF ports, the control unit in the target second tuning switch circuit can also control the conduction between the second RF common port and the target third RF port in at least one second RF port to achieve selective access to the target second impedance adjustment element.
[0068] The target second impedance adjustment element is the second impedance adjustment element 2012 corresponding to the second radio frequency port other than the target third radio frequency port among the multiple second radio frequency ports.
[0069] When the second RF common port is connected to the target third RF port in at least one of the second RF ports, the second RF port other than the target third RF port in at least one of the second RF ports is disconnected from the second RF common port.
[0070] Specifically, refer to Figure 4 The second common RF port of the second switch chip 2011 is the second common RF port RFC, and the two second RF ports are the first RF port RF1 and the first RF port RF2.
[0071] Among them, combined Figure 3 and Figure 4In the case of two second tuning switch circuits 201, in the first second tuning switch circuit 201, the second RF common port RFC is connected to the ground terminal and one end of the first inductor L1, the second RF port RF1 is connected to the other end of the first inductor L1 and one end of the second inductor L2, and the second RF port RF2 is connected to the other end of the second inductor L2. In the second second tuning switch circuit 201, the second RF common port RFC is connected to one end of the first inductor L1 and the second RF port RF2 of the second switch chip 2011 in the first second tuning switch circuit 201; the second RF port RF1 is connected to the other end of the first inductor L1 and one end of the second inductor L2, and the second RF port RF2 is connected to the other end of the second inductor L2 and the antenna 30.
[0072] Furthermore, the second switch chip 2011 also has a voltage control (VCTL) port VCTL, a power supply voltage (VDD) port VDD, and a ground (GND) port GND. The voltage control port VCTL is connected to the controller and the control unit respectively. The voltage control port VCTL in the target second tuning switch circuit is used to send the control signal received from the controller to the control unit in the target second tuning switch circuit. The power supply voltage port VDD is used to connect to the power supply and input the positive power supply voltage (Voltage Common Collector, VCC). The ground port GND is used for grounding.
[0073] Assuming the target's second tuning switch circuit is the first second tuning switch circuit 201, the target's third RF port is the first RF port RF1, and the target's second impedance adjustment element is the second inductor L2, refer to... Figure 3 and Figure 4 In the first second tuning switch circuit 201, the control unit of the second switch chip 2011 can control the second radio frequency common port RFC and the second radio frequency port RF1 to conduct under the control of the control signal received by the voltage control port VCTL, so as to achieve selective access to the second inductor L2.
[0074] Furthermore, when each second impedance adjustment element 2012 includes multiple inductors, these multiple inductors can be connected in series or in parallel.
[0075] It should be noted that the controller and the 3 / 8 decoder can independently control at least one first switching chip and at least one second switching chip, and can obtain antenna tuning circuits with different tuning capabilities based on different numbers of first impedance adjustment elements and different numbers of second impedance adjustment elements according to the tuning algorithm. This improves the accuracy of adjusting the antenna's input impedance. The tuning capability includes the ability to adjust the resistive component of the input impedance and the ability to cancel the reactive component of the input impedance.
[0076] Optionally, the antenna tuning circuit for each tuning capability and the corresponding control code can be recorded in the software in the form of a truth table, so that the controller and the 3 / 8 decoder can send control signals based on the control codes in the truth table.
[0077] Figure 5 This is a schematic diagram of the structure of an antenna tuning module provided in one embodiment of the present invention.
[0078] like Figure 5 As shown, the antenna tuning module 200 includes an impedance matching circuit 40, an RF transceiver circuit 50, and the aforementioned antenna tuning circuit 100. The antenna tuning circuit 100 is connected to the antenna 30, and the RF transceiver circuit 50 is connected to the antenna 30 after being connected in series with the impedance matching circuit 40.
[0079] Specifically, the radio frequency transceiver circuit 50 is used for transmitting and receiving radio signals. In wireless communication between the antenna 30 and the radio frequency transceiver circuit 50, the input impedance of the antenna 30 needs to match the output impedance of the radio frequency transceiver circuit, i.e., reach the standard impedance value. The impedance matching circuit 40 is used in conjunction with the antenna tuning circuit 100 to adjust the input impedance of the antenna 30 so that the input impedance of the antenna 30 matches the output impedance of the radio frequency transceiver circuit 50. The impedance matching circuit can be an L-type matching circuit, a π-type matching circuit, or a T-type matching circuit.
[0080] Furthermore, Figure 6 This is a schematic diagram of an impedance matching circuit provided in one embodiment of the present invention. Figure 6As shown, the impedance matching circuit 40 includes: a first matching inductor L3, a second matching inductor L4, a first matching capacitor C3, a second matching capacitor C4, a fuse 401, and a bidirectional breakdown diode 402. One end of the second matching capacitor C4 is connected in series with the fuse 401 and then connected to the antenna 30. The other end of the second matching capacitor C4, one end of the second matching inductor L4, and one end of the bidirectional breakdown diode 402 are all connected to the transceiver interface 501 in the RF transceiver circuit 50. The other end of the second matching inductor L4 is grounded, the other end of the bidirectional breakdown diode 402 is grounded, one end of the first matching inductor L3 is connected to one end of the fuse 401, and the other end of the first matching inductor L3 is grounded. One end of the first matching capacitor C3 is connected to the other end of the fuse 401, and the other end of the first matching capacitor C3 is grounded.
[0081] Specifically, the transceiver interface 501 may also include a signal (SIGNAL) port SIGNAL, a first ground port GND1, a second ground port GND2, and a third ground port GND3. The other end of the second matching capacitor C4, one end of the second matching inductor L4, and one end of the bidirectional breakdown diode 402 are all connected to the signal port SIGNAL, and the first ground port GND1, the second ground port GND2, and the third ground port GND3 are all grounded.
[0082] In the above embodiments, the antenna tuning module, through the antenna tuning circuit described above, can adaptively adjust the antenna's input impedance to a standard impedance value when the antenna's operating frequency changes, causing the antenna's input impedance to change. This makes the antenna's input impedance purely resistive, improving the flexibility of adjusting the antenna's input impedance. Furthermore, it eliminates the need for manual adjustment of the antenna's geometry, reducing labor costs and thus improving the efficiency of adjusting the antenna's input impedance.
[0083] Figure 7 This is a schematic diagram of the structure of an antenna module provided in one embodiment of the present invention.
[0084] like Figure 7 As shown, the antenna module 300 includes an antenna 30 and an antenna tuning module 200; the antenna 30 has a tuning feed point 301, an RF feed point 302 and a ground feed point 303; wherein, the tuning feed point 301 is connected to the antenna tuning circuit 100 in the antenna tuning module; the RF feed point 302 is connected to the antenna tuning circuit 100 in the antenna tuning module 200; and the ground feed point 303 is grounded.
[0085] In the above embodiments, the antenna module, through the antenna tuning module, can adaptively adjust the antenna's input impedance to a standard impedance value when the antenna's operating frequency changes, causing the antenna's input impedance to change. This makes the antenna's input impedance purely resistive, improving the flexibility of adjusting the antenna's input impedance. Furthermore, it eliminates the need for manual adjustment of the antenna's geometry, reducing labor costs and thus improving the efficiency of adjusting the antenna's input impedance.
[0086] Furthermore, Figure 8 This is a structural block diagram of an electronic device provided in one embodiment of the present invention.
[0087] like Figure 8 As shown, the electronic device 1000 includes: an electronic device body and the aforementioned antenna module 300.
[0088] In the above embodiments, the electronic device, through the antenna module described above, can adaptively adjust the antenna's input impedance to a standard impedance value when the antenna's operating frequency changes, causing the antenna's input impedance to change, and make the antenna's input impedance purely resistive. This improves the flexibility of adjusting the antenna's input impedance and eliminates the need for manual adjustment of the antenna's geometry, reducing labor costs and thus improving the efficiency of adjusting the antenna's input impedance.
[0089] It should be understood that the various parts of this utility model can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.
[0090] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0091] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0092] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0093] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0094] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0095] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
Claims
1. An antenna tuning circuit, characterized in that, include: Resistance adjustment circuit and reactance cancellation circuit; The resistor adjustment circuit and the reactance cancellation circuit are connected in parallel and then connected to the antenna. The resistor adjustment circuit is used to adjust the resistance component in the input impedance of the antenna so that the adjusted resistance component is equal to the standard impedance value of the antenna. The reactance cancellation circuit is used to cancel the reactance component in the input impedance of the antenna.
2. The antenna tuning circuit according to claim 1, characterized in that, The resistance adjustment circuit includes at least one first tuning switch circuit, and the reactance cancellation circuit includes at least one second tuning switch circuit.
3. The antenna tuning circuit according to claim 2, characterized in that, At least one first tuning switch circuit may be multiple, and multiple first tuning switch circuits may be connected in parallel. At least one second tuning switch circuit may be multiple, and multiple second tuning switch circuits may be connected in series.
4. The antenna tuning circuit according to claim 2, characterized in that, At least one of the target first tuning switch circuits in the first tuning switch circuit is used to adjust the resistance component in the input impedance of the antenna so that the adjusted resistance component is equal to the standard impedance value of the antenna. At least one target second tuning switch circuit in the second tuning switch circuit is used to cancel the reactive component in the input impedance of the antenna.
5. The antenna tuning circuit according to claim 4, characterized in that, Each of the first tuning switch circuits includes: a first switch chip and at least one first impedance adjustment element; the first switch chip is connected in parallel with the reactance cancellation circuit through at least one first impedance adjustment element. The first switch chip in the target first tuning switch circuit is used to select and connect to the target first impedance adjustment element in the target first tuning switch circuit based on the resistance change of the resistance component and the standard impedance value.
6. The antenna tuning circuit according to claim 5, characterized in that, The first switching chip has: at least one first radio frequency port; each of the first impedance adjustment elements includes at least one capacitor; Each of the first radio frequency ports is connected to at least one of the capacitors.
7. The antenna tuning circuit according to any one of claims 4 to 6, characterized in that, Each of the second tuning switch circuits includes: a second switch chip and at least one second impedance adjustment element; the second switch chip and at least one second impedance adjustment element are connected in parallel and then connected to the antenna; The second switch chip in the target second tuning switch circuit is used to select and connect to the target second impedance adjustment element in the target second tuning switch circuit based on the reactance component.
8. The antenna tuning circuit according to claim 7, characterized in that, The second switching chip has: a radio frequency common port and at least one second radio frequency port; each of the second impedance adjustment elements includes at least one inductor; The radio frequency common port is connected to the target end and one end of the corresponding at least one inductor, and each second radio frequency port is connected to the other end of the corresponding at least one inductor. The target terminal is a ground terminal, or the target terminal is the target second radio frequency port of the previous second switch chip.
9. An antenna tuning module, characterized in that, include: Impedance matching circuit, radio frequency transceiver circuit, and antenna tuning circuit as described in any one of claims 1 to 8; The antenna tuning circuit is connected to the antenna, and the radio frequency transceiver circuit is connected to the antenna after being connected in series with the impedance matching circuit.
10. An antenna module, characterized in that, include: Antenna, and the antenna tuning module as described in claim 9; The antenna has a tuning feed point, an RF feed point, and a ground feed point; The tuning feed point is connected to the antenna tuning circuit in the antenna tuning module. The RF feed point is connected to the impedance matching circuit in the antenna tuning module.
11. An electronic device, characterized in that, include: The electronic device body, and the antenna module as described in claim 10.