Pressure-sensitive button type antenna and electronic equipment

Abstract

The invention provides a pressure-sensitive button type antenna and electronic equipment, and the antenna comprises a radiation branch knot and a piezoresistive sequence, one end of the radiation branch knot is grounded, the radiation branch knot generates first resonance under the excitation of a feed circuit, and a plurality of pressure-sensitive resistors included in the piezoresistive sequence are sequentially connected in series in the length direction of the radiation branch knot and are connected with a pressure-sensitive detection circuit. The feed circuit comprises a feed source and a tuning device, and the tuning device is matched with the impedance of the feed circuit according to the voltage change of the piezoresistive sequence, so that the impedance of the feed circuit is kept constant. According to the embodiment of the invention, the pressure-sensitive key and the antenna are designed in the same body, thereby greatly reducing the occupation of the pressure-sensitive key and the antenna on the equipment space, relieving the space conflict problem of the design of the pressure-sensitive key and the antenna, improving the induction range of the pressure-sensitive key, enriching the interaction modes, relieving the antenna frequency problem through the tuning device, and improving the antenna performance.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of electronic devices, in particular to a pressure-sensitive key type antenna and an electronic device. BACKGROUND

[0002] Electronic devices generally have keys arranged on the side to realize power on / off, volume adjustment and other functions. In order to enrich the user interaction mode, some devices integrate pressure sensing technology to form pressure-sensitive keys, and make the pressure-sensitive keys occupy more space to expand the sensing range.

[0003] At the same time, with the development of communication technology, the electronic device needs to support more and more antenna frequency bands, and most of the space on the side of the electronic device is occupied by the antenna, resulting in a significant conflict between the pressure-sensitive key and the antenna design in space. SUMMARY

[0004] In order to solve the problem of space conflict between the pressure-sensitive key and the antenna design, the present disclosure provides a pressure-sensitive key type antenna and an electronic device with the same.

[0005] In a first aspect, the present disclosure provides a pressure-sensitive key type antenna, comprising:

[0006] a radiation branch, one end of the radiation branch being provided with a first terminal connected to ground, and a second terminal being further provided on the radiation branch, the second terminal being connected to a feed circuit, the feed circuit exciting the radiation branch to generate a first resonance;

[0007] a piezoresistive sequence, the piezoresistive sequence comprising a plurality of piezoresistors arranged in series along the length direction of the radiation branch, the piezoresistive sequence being connected to a pressure sensing detection circuit, the pressure sensing detection circuit being configured to detect the voltage change of the piezoresistive sequence;

[0008] wherein the feed circuit comprises a feed source and a tuning device, the tuning device being configured to match the impedance of the feed circuit according to the voltage change of the piezoresistive sequence, so as to keep the impedance of the feed circuit constant.

[0009] In some embodiments, the pressure-sensitive key type antenna comprises a flexible circuit board, a metal layer of the flexible circuit board forming the radiation branch, and the piezoresistive sequence being arranged on the flexible circuit board and not being electrically connected to the metal layer.

[0010] In some embodiments, a connector is arranged on the flexible circuit board at the position of the first terminal, the connector being configured to be connected to a main board, and the piezoresistive sequence being electrically connected to the pressure sensing detection circuit on the main board through the connector.

[0011] In some embodiments, the plurality of piezoresistors in the piezoresistance sequence have different resistance values, and the sum of resistance values of any two adjacent piezoresistors is also different.

[0012] In some embodiments, the plurality of piezoresistors in the piezoresistance sequence have resistance values arranged in a prime number sequence.

[0013] In some embodiments, the piezoresistance detection circuit includes an input end and an output end, the plurality of piezoresistors in the piezoresistance sequence are connected in series between the input end and the output end, the input end is configured to input a power supply voltage, the output end is connected to a first branch and a second branch in parallel, the first branch is connected to a processor, and the second branch is connected to ground through a voltage dividing resistor.

[0014] The processor is configured to obtain a voltage parameter of the first branch, and determine a corresponding target operation instruction according to the voltage parameter.

[0015] In some embodiments, the tuning device includes a voltage-controlled capacitor, one electrode of the voltage-controlled capacitor is connected to the feed source, the other electrode is connected to the second terminal, and the bias voltage terminal of the voltage-controlled capacitor is connected to the first branch.

[0016] In a second aspect, the embodiments of the present disclosure provide an electronic device including the piezoresistive key antenna according to any of the above embodiments, and the piezoresistive key antenna is arranged on a side frame of the electronic device.

[0017] In some embodiments, the electronic device further includes a mainboard, and the piezoresistance detection circuit and the feed circuit are arranged on the mainboard.

[0018] In some embodiments, the electronic device further includes a processor configured to obtain a voltage parameter of the piezoresistance sequence detected by the piezoresistance detection circuit, and execute a corresponding target operation instruction according to the voltage parameter.

[0019] The piezoresistive key antenna according to the embodiments of the present disclosure includes a radiation branch and a piezoresistance sequence, one end of the radiation branch is connected to ground, and the radiation branch generates a first resonance under the excitation of a feed circuit, the plurality of piezoresistors in the piezoresistance sequence are connected in series in the length direction of the radiation branch and connected to a piezoresistance detection circuit, and the feed circuit includes a feed source and a tuning device, the tuning device matches the impedance of the feed circuit according to the voltage change of the piezoresistance sequence, so that the impedance of the feed circuit remains constant. In the embodiments of the present disclosure, the piezoresistive key and the antenna are designed in one body, which greatly reduces the space occupation of the two in the device, alleviates the space conflict problem of the piezoresistive key and the antenna design, improves the sensing range of the piezoresistive key, enriches the interaction mode, and alleviates the antenna frequency problem through the tuning device to improve the antenna performance. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the specific embodiments of the present disclosure or the prior art, the drawings needed to be used in the specific embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present disclosure, and other drawings can be obtained by a person of ordinary skill in the art without creative effort based on these drawings.

[0021] Figure 1 is a schematic diagram of a side key area of a mobile phone in the related art.

[0022] Figure 2 is a structural schematic diagram of a side key of a mobile phone in the related art.

[0023] Figure 3 is a structural schematic diagram of an IFA antenna.

[0024] Figure 4 is a schematic diagram of a pressure-sensitive button.

[0025] Figure 5 is a structural schematic diagram of an electronic device in some embodiments of the present disclosure.

[0026] Figure 6 is a structural schematic diagram of a radiation stub in some embodiments of the present disclosure.

[0027] Figure 7 is a structural schematic diagram of an antenna in some embodiments of the present disclosure.

[0028] Figure 8 is a structural schematic diagram of a pressure-sensitive button in some embodiments of the present disclosure.

[0029] Figure 9 is a schematic diagram of a pressure-sensitive button in some embodiments of the present disclosure.

[0030] Figure 10 is an equivalent circuit diagram of a pressure-sensitive button in some embodiments of the present disclosure.

[0031] Figure 11 is a structural schematic diagram of a pressure-sensitive button antenna in some embodiments of the present disclosure.

[0032] Figure 12 is a curve diagram of a voltage-controlled capacitor in some embodiments of the present disclosure.

[0033] Figure 13 is a structural block diagram of an electronic device in some embodiments of the present disclosure. DETAILED DESCRIPTION

[0034] The technical solutions of the present disclosure will be described clearly and completely in connection with the drawings. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present disclosure. In addition, the technical features involved in different embodiments of the present disclosure described below can be combined with each other as long as they do not conflict with each other.

[0035] For electronic devices such as mobile phones and tablets, physical buttons are generally arranged on the side of the device to realize simple functions such as power on / off and volume adjustment. For example, taking a smart phone as an example, Figure 1 The side key area for setting the side button on the mobile phone is shown, which is generally located on the left and right sides of the mobile phone. Figure 2 The internal structure of the side key is shown. Generally, the FPC (Flexible Printed Circuit) of the side key is attached to the inner wall of the mobile phone frame, and is connected to the mainboard through a BTB (Board to Board) connector.

[0036] On the basis of the above, some electronic devices also integrate pressure sensing technology on the button to form a pressure sensing button. Unlike physical buttons, the pressure sensing button does not need to be pressed and rebound, but uses pressure sensing technology to detect the deformation of the piezoresistive material to simulate the real pressing process.

[0037] In addition to simulating the single click / double click, short press / long press and other operations of the physical button, the pressure sensing button can also detect the pressing position, or realize the detection of the sliding direction by combining the position change, so as to enrich the interaction mode between the user and the device. For example, taking sliding interaction as an example, in order to enable the user's finger to have a certain sliding distance on the button, it is required that the pressure sensing button has a sensing range with sufficient length on the side frame of the device.

[0038] Nowadays, with the development of communication technology, electronic devices need to support more and more communication frequency bands, and the number of antennas integrated in the electronic devices is also increasing. The antenna design is mainly concentrated in the frame space, which causes most of the space of the device frame to be occupied by the antenna, resulting in a significant conflict between the pressure sensing button and the antenna design in space.

[0039] The current solution is mainly to balance the space size of the antenna and the pressure sensing button, and to avoid the button area as much as possible in the antenna layout. This way not only limits the sensing range of the pressure sensing button, causing the performance of the pressure sensing button to be limited, but also brings great difficulty to the design of the antenna. The antenna after being compressed in space also faces the problem of performance sacrifice.

[0040] Based on this, the embodiment of the present disclosure provides a pressure-sensitive key type antenna, which integrates the pressure-sensitive key and the antenna in the same component structure, thereby relieving the space conflict problem of the pressure-sensitive key and the antenna and improving the performance of the pressure-sensitive key and the antenna.

[0041] First, for the convenience of understanding and description, some terms and technical terms appearing in the following embodiments of the present disclosure are explained.

[0042] Radiating body / radiating branch: It is a device for receiving and transmitting electromagnetic wave radiation in an antenna. The radiating body / radiating branch is made of metal. In different antenna types and antenna systems, the shape and size of the radiating body / radiating branch are also different. In some cases, the "antenna" in the narrow sense is the radiating body / radiating branch, that is, the radiating body / radiating branch can be directly referred to as an antenna. In the broad sense, the radiating body / radiating branch represents the part of the antenna for receiving and transmitting electromagnetic waves. In addition to the radiating body / radiating branch, the antenna often also includes electrical parts such as a feed circuit and a matching circuit.

[0043] Feed circuit: It is a combination of all circuits for receiving and transmitting radio frequency signals. The feed circuit can include a transceiver and a radio frequency front-end circuit. In some embodiments, the feed circuit can be a radio frequency chip.

[0044] Resonance: It refers to the resonance frequency generated by the antenna. The resonance frequency can have a frequency range, that is, the frequency range in which the current resonates on the radiating body / radiating branch. The frequency corresponding to the strongest resonance point is the center point of the resonance frequency, also called the center frequency point.

[0045] IFA antenna: The full name is Inverted-F Antenna. Its antenna structure can be as shown in Figure 3 The structure of the IFA antenna is that one end of the radiating branch is grounded (GND) and the other end is open. The feed circuit is connected to the radiating branch, so that the grounded end, the radiating branch, and the feed circuit form a structure similar to an inverted F. Therefore, the IFA antenna is also called an inverted F antenna. The resonance mode of the IFA antenna is 1 / 4 wavelength mode, that is, the effective electrical length of the radiating branch of the IFA antenna is 1 / 4 of the wavelength corresponding to the resonance frequency of the antenna.

[0046] Pressure-sensitive key: Pressure sensing is a technology that can detect and respond to physical pressure. The pressure-sensitive key can be realized by using a piezoresistive sensor. The piezoresistive sensor uses the piezoresistive effect of the material to detect the change in resistance caused by the deformation of the material to detect pressure. For example Figure 4 As shown in the figure, the piezoresistive sensor is generally composed of a glass, plastic, etc. panel, adhesive, and piezoresistive material. When external force is applied to the piezoresistive sensor, the piezoresistive material deforms, and its resistance value changes, so that the change in resistance value can be detected by a detection circuit.

[0047] FPC: refers to flexible printed circuit board, which is a kind of flexible and foldable printed circuit board, which is usually composed of base layer, conductor layer, insulating layer, cover layer and the like. The conductor layer is also the metal layer, and the FPC can have one or more metal layers, and the material of the metal layer is generally copper, and the circuit pattern is formed on the metal layer by etching technology. In the embodiment of the present disclosure, the metal layer in the FPC can be used as an antenna radiation branch.

[0048] Connector: the end of the FPC is usually provided with a connector for connecting with other electronic components or circuit boards. The connector can be, for example, a BTB connector, a ZIF (Zero Insertion Force) connector or other types of interfaces.

[0049] After understanding the above, the structure and principle of the pressure-sensitive key type antenna of the embodiment of the present disclosure will be described below.

[0050] In the embodiment of the present disclosure, the pressure-sensitive key type antenna can be applied to electronic devices, and since it integrates the functions of pressure-sensitive key and antenna, it can be arranged on the side frame of the electronic device, which serves as the key of the electronic device and also as the antenna of the electronic device.

[0051] For example, taking a smart phone as an example, referring to FIG. 1, Figure 5 Figure 5 only the radiation branch structure of the pressure-sensitive key type antenna of the embodiment of the present disclosure and the phone shell of the smart phone are shown. The phone shell includes a frame and a bottom shell, and the frame refers to the middle frame of the side of the phone.

[0052] In the embodiment of the present disclosure, the radiation branch can be arranged close to the inner wall of the frame, so that when the user presses the frame, the piezoresistance sequence arranged on the radiation branch can sense the change of resistance value, thereby realizing the function of pressure-sensitive key.

[0053] Of course, in some embodiments, the frame at the position of the radiation branch can also be specially treated, for example, the material, color, thickness, structure and the like of the frame at the position are distinguished from other positions, on the one hand, it is convenient for the user to touch the key position, and on the other hand, it improves the sensitivity and effect of pressure sensing. Those skilled in the art can understand this, and the present disclosure will not be described here.

[0054] According to the foregoing, the pressure-sensitive key type antenna in the embodiment of the present disclosure needs to realize the functions of pressure-sensitive key and antenna at the same time. In the following, the circuit structure and principle of the IFA antenna will be described first, then the circuit structure and principle of the pressure-sensitive key will be described, and finally the principle of the combination of the two to form the pressure-sensitive key type antenna of the present disclosure will be described.

[0055] Figure 6 ​The structure of the radiating stub of the pressure-sensitive button antenna in this embodiment is shown. Figure 7 It shows the use of Figure 6 The structure of the IFA antenna formed by the radiating stubs is shown.

[0056] See Figure 6 and Figure 7 As shown, the antenna disclosed herein includes a radiating stub, which refers to the radiator of the antenna. The radiating stub can be a piece of metal. For example, in some embodiments, the radiating stub can be formed using one of the metal layers included in the side key PFC.

[0057] One end of the radiating stub is provided with a first terminal, which is grounded (GND) to form the antenna ground terminal. The other end of the radiating stub is an open end. The radiating stub is also provided with a second terminal, which is connected to the feed circuit to form the antenna feed terminal. The feed circuit is used to excite the radiating stub to generate the first resonance.

[0058] contrast Figure 7 and Figure 3 It can be understood that in this embodiment of the disclosure, an IFA antenna is formed by feeding and grounding the radiating stub. That is, the effective electrical length of the radiating stub from the open end to the first terminal is 1 / 4 of the wavelength corresponding to the resonant frequency of the first resonance. Based on this principle, those skilled in the art can design an IFA antenna according to their needs to achieve an antenna with the corresponding resonant frequency, which will not be elaborated further in this disclosure.

[0059] pass Figure 7 The implementation method can be... Figure 6 An IFA antenna is formed on the radiating stub (or side key FPC) shown. Figure 8 The circuit structure and principle of the pressure-sensitive button in the embodiment of this disclosure are shown below. Figure 8 Please provide an explanation.

[0060] like Figure 8 As shown, the pressure-sensitive button includes a piezoresistive sequence, which refers to multiple pressure-sensitive resistors arranged in series along the length of the radiating stub. For example... Figure 8 In the example, the pressure-sensitive resistors R1 to Rn are connected in series.

[0061] It is worth noting that in some embodiments, the radiating branch is a metal layer in the side-key FPC, while the piezoresistive sequence and the wires connecting each piezoresistive resistor can be located in other metal layers of the FPC. That is, the piezoresistive sequence and the radiating branch are electrically isolated on the FPC and do not affect each other.

[0062] A pressure-sensitive resistor is a resistor made of piezoresistive material, which deforms when pressure is applied, causing a change in resistance. In this embodiment, there are no restrictions on the size and number of pressure-sensitive resistors; they can be any number, that is, n in R1 to Rn can take any positive integer value.

[0063] In this embodiment of the disclosure, the piezoresistive sequence formed by the series connection of pressure-sensitive resistors on the FPC is connected to the pressure-sensitive detection circuit. The pressure-sensitive detection circuit can be set on the motherboard, so that the FPC can be provided with a connector at the first terminal position. The connector can be, for example, a BTB connector. The FPC is connected to the motherboard through the BTB connector, thereby realizing the electrical connection between the piezoresistive sequence and the pressure-sensitive detection circuit.

[0064] Continue to refer to Figure 8 As shown, the pressure-sensitive detection circuit includes an input terminal a and an output terminal b. The piezoresistive sequence, consisting of pressure-sensitive resistors R1 to Rn, is connected in series between input terminal a and output terminal b. Input terminal a is connected to the power supply voltage Vp, which is a constant voltage. Output terminal b connects to a first branch and a second branch connected in parallel. The second branch includes a voltage-dividing resistor R. n+1 The voltage divider resistor Rn+1 is grounded, and the first branch is connected to the processor, which can be a SoC (System on Chips), MCU (Microcontroller Unit), or other electronic devices.

[0065] In some implementations, the first branch also includes an analog-to-digital converter (ADC), which converts analog voltage signals into digital voltage signals that can be processed by the processor.

[0066] Figure 9 It shows Figure 8 A schematic diagram of pressure-sensitive buttons in various scenarios, shown below. Figure 9 The working principle of the pressure-sensitive buttons disclosed herein is explained.

[0067] like Figure 9 As shown, when a user presses a pressure-sensitive resistor in the range R1 to Rn with their finger, the resistance of that resistor changes after being subjected to force. The resistance of R1 to Rn is defined as Rx. At this time, the power supply voltage Vp is equivalent to being applied across Rx and the voltage divider resistor R. n+1 The equivalent circuit across these two resistors is as follows: Figure 10 As shown, the relationship between the power supply voltage Vp and the voltage divider Vd of the first branch can be expressed as:

[0068]

[0069] In formula (1), the first branch voltage Vd is the voltage parameter of the pressure sensing detection. As can be seen from formula (1), when the user touches the area where a certain pressure sensing resistor in the pressure resistance sequence is located, the resistance value of the resistor Rx changes, the resistance value of the voltage dividing resistor R n+1 is a constant value, and thus the voltage parameter Vd at this time can be calculated. After obtaining the voltage parameter Vd, the processor can determine that the pressure sensing button is triggered by the user at this time according to the voltage parameter Vd, and thus the electronic device can be controlled to execute the corresponding target operation instruction.

[0070] In some embodiments, in order to further detect the trigger position of the user on the pressure sensing button, the resistance values of the pressure sensing resistors in the pressure resistance sequence can be set to be different from each other, and the resistance values and of any two adjacent pressure sensing resistors are also different.

[0071] For example, in some embodiments, the resistance values of the pressure sensing resistors R1-Rn can be set to increase in turn. For example, in one example, the resistance values of the pressure sensing resistors R1-Rn can be arranged in a prime number sequence in turn, and the resistance values of R1-Rn are shown in Table 1 as follows:

[0072] Table 1: Resistance values of pressure sensing resistors in the pressure resistance sequence

[0073]

[0074] First, the purpose of setting the resistance values of the pressure sensing resistors in the pressure resistance sequence to be different from each other is that if there are pressure sensing resistors with the same resistance value in the pressure resistance sequence, the resistance value change caused by the user touching the two pressure sensing resistors is the same, and thus the calculated voltage parameter Vd is also the same, and it is not possible to accurately distinguish which area of the pressure sensing resistor the user touches.

[0075] Therefore, by setting the resistance values of the pressure sensing resistors to be different from each other, the calculated voltage parameter Vd is different no matter which area of the pressure sensing resistor in the pressure resistance sequence the user touches, and thus the position of the button touched by the user can be accurately detected.

[0076] Second, the purpose of setting the resistance values and of any two adjacent pressure sensing resistors to be different from each other is that for some users with thicker fingers, a single touch of the user can cover two pressure sensing resistor areas at the same time, and thus the resistance value change caused is the sum of the resistance values of the two adjacent pressure sensing resistors. If there are two groups of adjacent pressure sensing resistors with the same resistance sum in the pressure resistance sequence, when the user touches the areas where the two groups of adjacent pressure sensing resistors are located, the calculated voltage parameter Vd is the same, and it is not possible to accurately distinguish which area of the adjacent pressure sensing resistors the user touches.

[0077] Therefore, by setting the resistance values and differences of any two adjacent pressure sensing resistors, even if a user touches and covers the areas where the two pressure sensing resistors are located at the same time, the calculated voltage parameter Vd is different, so that the detection error can be eliminated or alleviated.

[0078] By Figure 7 In an embodiment, the IFA antenna is formed on the side key FPC, and the pressure sensing key is formed on the side key FPC. Figure 8 In an embodiment, the pressure sensing key can be formed on the side key FPC. Figure 11 A structure diagram of the pressure sensing key type antenna in the embodiment of the present disclosure is shown, that is, in the embodiment, the IFA antenna and the pressure sensing key are formed on the same FPC. Figure 11 In the embodiment, the IFA antenna and the pressure sensing key can be realized in the same body.

[0079] Referring to Figure 11 As shown, one metal layer of the FPC can be used to form the radiation branch, and then the first terminal of the radiation branch is grounded and the second terminal is fed, so that the aforementioned IFA antenna is formed.

[0080] On this basis, the pressure resistance sequence can be arranged on the FPC, and the plurality of pressure sensing resistors included in the pressure resistance sequence are connected in series by the wire. It should be noted that the pressure resistance sequence and the wire can be realized by using the metal layer of the FPC different from the radiation branch, that is, the pressure resistance sequence and the radiation branch are electrically isolated, and do not affect each other.

[0081] For the pressure resistance sequence, the connector can be arranged at the position of the first terminal of the FPC, so that when the FPC is connected to the mainboard through the connector, the pressure resistance sequence can be connected to the pressure sensing detection circuit on the mainboard to form the aforementioned pressure sensing key.

[0082] It should be understood that for the pressure sensing key, the principle is to change the resistance value of the pressure resistance sequence by applying external force to realize pressure sensing detection, which will not be affected by the IFA antenna. However, for the IFA antenna, the antenna radiates energy to the space through the radiation branch, and if the user's finger approaches or contacts the radiation branch, the human body will affect the radiation performance of the antenna, causing the impedance of the antenna system to change, so that the resonant frequency of the antenna changes, resulting in a decrease in the performance of the antenna.

[0083] For example, in an example scenario, assuming that the center frequency of the first resonance generated by the pressure sensing key type antenna in the same body is 1.575 GHz, and when the user's finger approaches or contacts the radiation branch of the antenna, the impedance of the antenna system changes, and the center frequency of the first resonance generated by the antenna may deviate from the original 1.575 GHz, resulting in a decrease in the performance of the antenna. Moreover, the position of the antenna radiation branch contacted by the user's finger is different, and the impedance change caused thereby is also different, so that the frequency offset is also different.

[0084] Therefore, in the embodiments of the present disclosure, when the IFA antenna is combined with the pressure-sensitive button, the influence of the user's finger contact or proximity to the radiation branch on the antenna performance needs to be alleviated or eliminated, so that the impedance of the antenna system always remains at a relatively stable value, thereby stabilizing the antenna resonant frequency and improving the antenna efficiency.

[0085] Referring to Figure 11 As shown in the figure, in the embodiments of the present disclosure, the feed circuit includes a feed source and a tuning device, the feed source refers to the radio frequency excitation source of the antenna system, and the feed source can be, for example, a radio frequency chip. The tuning device refers to a device that can adjust the impedance of the antenna system. It can be understood that, in the embodiments of the present disclosure, different positions of the human body contacting the radiation branch will cause different changes in the antenna impedance. Therefore, the tuning device should be a device that can dynamically adjust the antenna impedance, for example, a voltage-controlled capacitor.

[0086] The voltage-controlled capacitor, also known as a varactor diode, is a special semiconductor diode, and its capacitance value can be dynamically adjusted by the bias voltage applied thereto. The voltage-controlled capacitor is composed of a PN structure. When no voltage is applied to the voltage-controlled capacitor, the depletion region of the PN junction is relatively small. When a bias voltage is applied, the bias voltage causes the charges in the depletion region to be further repelled, thereby increasing the width of the depletion region, resulting in a decrease in the capacitance value of the PN junction, that is, the capacitance value of the voltage-controlled capacitor is inversely proportional to the bias voltage.

[0087] In some embodiments of the present disclosure, the characteristics of the voltage-controlled capacitor can be utilized. When the user's finger is close to or contacts the radiation branch and causes a change in the impedance, the capacitance value of the voltage-controlled capacitor can be changed by changing the bias voltage of the voltage-controlled capacitor, thereby matching the appropriate impedance for the antenna system, so that the antenna impedance remains in a relatively constant state, thereby ensuring the antenna performance.

[0088] However, as known from the foregoing, the frequency shift caused by the user contacting different positions of the radiation branch is different, and therefore the antenna impedance that needs to be corrected by the voltage-controlled capacitor is also different. How to reasonably adjust the bias voltage Vc of the voltage-controlled capacitor according to the user's touch position becomes a problem.

[0089] In the embodiments of the present disclosure, considering that the user contacts different positions of the radiation branch means that the user touches different pressure-sensitive resistors in the pressure resistance sequence, and therefore the voltage parameter Vd detected by the pressure-sensitive detection circuit is also different. Therefore, the voltage parameter Vd detected by the pressure-sensitive detection circuit can be used as the bias voltage Vc of the voltage-controlled capacitor, and by pre-setting the relationship between the voltage parameter Vd and the capacitance value, the automatic correction of the antenna frequency shift can be realized when the user contacts the radiation branch.

[0090] Specifically, referring to Figure 11As shown, one electrode of the voltage-controlled capacitor is connected to the feed source, and the other electrode is connected to the second terminal. At the same time, the bias voltage Vc of the voltage-controlled capacitor is connected to the first branch, that is, the bias voltage Vc of the voltage-controlled capacitor is the voltage division Vd of the first branch in the pressure detection circuit.

[0091] In the embodiments of the present disclosure, the relationship between the bias voltage and the capacitance value can be pre-configured by adjusting the material, size, and other properties of the variable capacitor. For example, in one example, Figure 12 As shown Figure 11 In the figure of the capacitance variation curve of the voltage-controlled capacitor, Figure 12 In the figure, the horizontal axis represents the bias voltage Vc (that is, Vd), and the vertical axis represents the capacitance value of the voltage-controlled capacitor.

[0092] In combination with Figure 11 And Figure 12 When the user touches the area where the pressure sensing resistor is located, the pressure detection circuit can calculate the voltage division of the first branch, that is, the voltage parameter Vd, according to the foregoing pressure detection process, and then according to the characteristics of the voltage-controlled capacitor, when the bias voltage is Vd, the capacitance value will automatically adjust to the corresponding capacitance value, thereby matching the impedance of the antenna system, forming a closed-loop control circuit, so that the impedance of the antenna system always remains at a relatively stable value, eliminating or alleviating frequency deviation, and improving the performance of the antenna.

[0093] As can be understood from the foregoing, in the embodiments of the present disclosure, the pressure sensing key and the antenna are designed in the same body, which greatly reduces the space occupation of the two on the device, and alleviates the space conflict problem between the pressure sensing key and the antenna design.

[0094] In addition, it can be understood that since the entire radiation branch of the antenna can be used to design the pressure sensing key, the sensing range of the pressure sensing key will be larger, and more interaction modes can be realized, such as sliding on the pressure sensing key. At the same time, since the antenna space will not be squeezed by the pressure sensing key, the difficulty of antenna design is reduced, and the performance of the antenna is improved.

[0095] More importantly, when the antenna and the pressure sensing key are designed in the same body, the detection voltage of the pressure detection circuit is used as the bias voltage of the voltage-controlled capacitor to realize self-correction of the antenna frequency deviation, without the need for additional software logic to detect and correct the antenna frequency, which greatly simplifies the difficulty of the common body design, and the antenna resonance performance is more stable, and the antenna efficiency is improved.

[0096] In some embodiments, the present disclosure provides an electronic device, which can be any suitable device type for implementation, such as a smartphone, a tablet computer, a wearable device, etc., and the present disclosure does not limit this.

[0097] In the embodiments of the present disclosure, the electronic device includes the pressure key antenna of any of the foregoing embodiments, for example Figure 5As shown, the electronic device takes a smartphone as an example, and the pressure-sensitive key type antenna can be arranged on the side frame of the smartphone.

[0098] Referring to Figure 11 As shown, in some embodiments, the electronic device further comprises a mainboard, and the feeding circuit and the pressure sensing circuit can be arranged on the mainboard. Meanwhile, the first terminal of the pressure-sensitive key type antenna can be arranged with a connector, and the mainboard is arranged with a corresponding connector, so that the pressure-sensitive key type antenna and the pressure sensing circuit on the mainboard can be electrically connected through the connector.

[0099] For the working principle of the antenna and the pressure-sensitive key in the pressure-sensitive key type antenna, those skilled in the art can refer to the foregoing embodiments, and the present disclosure will not be repeated here.

[0100] It is worth noting that the pressure-sensitive key of the embodiments of the present disclosure can realize various pressure-sensitive functions, such as single click, double click, short press, long press, sliding, etc. Therefore, the electronic device can pre-set the operation instructions corresponding to these operations in the system. For example, taking a shooting game scene as an example, the game actions corresponding to different pressure-sensitive operations can be pre-set or independently set by the user, such as single click corresponding to shooting, double click corresponding to switching weapons, long press corresponding to running, and sliding corresponding to jumping, etc.

[0101] After the electronic device detects the voltage parameter Vd through the foregoing process, the electronic device can determine the target operation instruction corresponding to the current voltage parameter Vd according to the pre-configured operation instruction, and then control the electronic device to execute the target operation instruction. Of course, those skilled in the art can understand that the operation instructions realized by the pressure-sensitive key of the present disclosure are not limited to the above examples, and the present disclosure will not be repeated here.

[0102] As known from the foregoing, in the embodiments of the present disclosure, the pressure-sensitive key and the antenna are designed in a common body, which greatly reduces the space occupation of the two, alleviates the space conflict problem of the pressure-sensitive key and the antenna design, improves the sensing range of the pressure-sensitive key, and enriches the interaction mode. In addition, when the antenna and the pressure-sensitive key are designed in a common body, the detection voltage of the pressure sensing circuit is used as the bias voltage of the voltage-controlled capacitor to realize self-correction of the antenna frequency offset, without the need for additional software logic to detect and correct the antenna frequency, which greatly simplifies the difficulty of common body design, and the antenna resonance performance is more stable, and the antenna efficiency is improved.

[0103] Figure 13 The electronic device structure in some embodiments of the present disclosure is shown in FIG. 1, and the following will be described in combination with Figure 13 The electronic device of some embodiments of the present disclosure is described.

[0104] Referring to Figure 13The electronic device 1800 can include one or more of the following components: a processing component 1802, a memory 1804, a power component 1806, a multimedia component 1808, an audio component 1810, an input / output (I / O) interface 1812, a sensor component 1816, and a communication component 1818.

[0105] The processing component 1802 usually controls overall operations of the electronic device 1800, such as operations associated with display, phone call, data communication, camera operation and recording operation. The processing component 1802 can include one or more processors 1820 to execute instructions. Moreover, the processing component 1802 can include one or more modules to facilitate interaction between the processing component 1802 and other components. For example, the processing component 1802 can include a multimedia module to facilitate the interaction between the multimedia component 1808 and the processing component 1802. For another example, the processing component 1802 can read executable instructions from the memory to implement electronic device related functions.

[0106] The memory 1804 is configured to store various types of data to support operations of the electronic device 1800. Examples of these data include instructions for any application or method operating on the electronic device 1800, contact data, phonebook data, messages, pictures, videos, and so on. The memory 1804 can be implemented by any type of volatile or non-volatile storage devices or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0107] The power component 1806 provides power to various components of the electronic device 1800. The power component 1806 can include a power management system, one or more power sources, and other components associated with generating, managing and distributing power for the electronic device 1800.

[0108] The multimedia component 1808 includes a display screen providing an output interface between the electronic device 1800 and a user. In some embodiments, the multimedia component 1808 includes a front-facing camera and / or a rear-facing camera. The front-facing camera and / or the rear-facing camera can receive external multimedia data when the electronic device 1800 is in an operation mode, such as a shooting mode or a video mode. Each of the front-facing camera and the rear-facing camera can be a fixed optical lens system or have focal length and optical zoom capabilities.

[0109] The audio component 1810 is configured to output and / or input audio signals. For example, the audio component 1810 includes a microphone (MIC) configured to receive an external audio signal when the electronic device 1800 is in a mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signal can be further stored in the memory 1804 or transmitted via the communication component 1818. In some embodiments, the audio component 1810 also includes a speaker for outputting audio signals.

[0110] The I / O interface 1812 provides an interface between the processing component 1802 and peripheral interface modules, which can be a keypad, a click wheel, buttons, and the like. The buttons can include, but are not limited to, a home button, a volume button, a start button, and a lock button.

[0111] The sensor component 1816 includes one or more sensors for providing various state assessments for the electronic device 1800. For example, the sensor component 1816 can detect an open / closed state of the electronic device 1800, relative positioning of components, such as a display and a keypad of the electronic device 1800, a change in position of the electronic device 1800 or a component of the electronic device 1800, presence or absence of user contact with the electronic device 1800, an orientation or acceleration / deceleration of the electronic device 1800, and a temperature change of the electronic device 1800. The sensor component 1816 can include a proximity sensor configured to detect presence of a nearby object without any physical touch. The sensor component 1816 can further include a light sensor, such as a CMOS or CCD image sensor, for use in an imaging application. In some embodiments, the sensor component 1816 can further include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0112] The communication component 1818 is configured to facilitate wired or wireless communication between the electronic device 1800 and other devices. The electronic device 1800 can access a wireless network based on a communication standard, such as Wi-Fi, 2G, 3G, 4G, 5G, or 6G, or a combination thereof. In an example embodiment, the communication component 1818 receives broadcast signals or broadcast-related information from an external broadcasting management system via a broadcast channel. In an example embodiment, the communication component 1818 further includes a near-field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technology.

[0113] In an exemplary embodiment, the electronic device 1800 can be implemented with one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, micro-controllers, microprocessors, or other electronic elements.

[0114] Obviously, the above-described embodiments are merely exemplary and are not intended to limit the embodiments. It will be apparent to those of ordinary skill in the art that other changes or modifications can be made to the embodiments described above. Here, it is not necessary or possible to exhaust all the embodiments. The obvious changes or modifications derived therefrom are still within the scope of protection of the disclosure.

Claims

1. A pressure-sensitive button antenna, characterized in that, include: A radiating branch, one end of which is provided with a grounded first terminal, and a second terminal is also provided on the radiating branch. The second terminal is connected to a power supply circuit, and the power supply circuit excites the radiating branch to generate a first resonance. A piezoresistive sequence, comprising a plurality of pressure-sensitive resistors connected in series along the length of the radial stub, the piezoresistive sequence being connected to a pressure-sensitive detection circuit for detecting voltage changes in the piezoresistive sequence; The power supply circuit includes a feed source and a tuning device, wherein the tuning device is configured to match the impedance of the power supply circuit according to the voltage variation of the piezoresistive sequence, so that the impedance of the power supply circuit remains constant.

2. The pressure-sensitive button antenna according to claim 1, characterized in that, The device includes a flexible circuit board, wherein a metal layer of the flexible circuit board forms the radiating branch, and the piezoresistive sequence is disposed on the flexible circuit board and is not electrically connected to the metal layer.

3. The pressure-sensitive button antenna according to claim 2, characterized in that, A connector is provided on the flexible circuit board at the first terminal position. The connector is used to connect to the motherboard. The piezoresistive sequence is electrically connected to the pressure-sensitive detection circuit on the motherboard through the connector.

4. The pressure-sensitive button antenna according to claim 1, characterized in that, The piezoresistive sequence includes a plurality of piezoresistive resistors, each of which has a different resistance value, and the sum of the resistance values ​​of any two adjacent piezoresistive resistors is also different.

5. The pressure-sensitive button antenna according to claim 4, characterized in that, The piezoresistive sequence includes a plurality of pressure-sensitive resistors whose resistance values ​​are arranged sequentially according to a prime number sequence.

6. The pressure-sensitive button antenna according to any one of claims 1 to 5, characterized in that, The pressure-sensitive detection circuit includes an input terminal and an output terminal. The plurality of pressure-sensitive resistors in the piezoresistive sequence are connected in series between the input terminal and the output terminal. The input terminal is used to input the power supply voltage. The output terminal is connected to a first branch and a second branch in parallel. The first branch is connected to the processor, and the second branch is grounded through a voltage divider resistor. The processor is configured to: acquire the voltage parameters of the first branch, and determine the corresponding target operation instruction based on the voltage parameters.

7. The pressure-sensitive button antenna according to claim 6, characterized in that, The tuning device includes a voltage-controlled capacitor, one electrode of which is connected to the feed source and the other electrode is connected to the second terminal. The bias voltage terminal of the voltage-controlled capacitor is connected to the first branch.

8. An electronic device, characterized in that, Includes a pressure-sensitive button antenna according to any one of claims 1 to 7, wherein the pressure-sensitive button antenna is disposed on the side frame of the electronic device.

9. The electronic device according to claim 8, characterized in that, It also includes a motherboard, on which the pressure-sensitive detection circuit and the power supply circuit are located.

10. The electronic device according to claim 8, characterized in that, It also includes a processor configured to acquire voltage parameters of the piezoresistive sequence detected by the pressure-sensitive detection circuit, and execute corresponding target operation instructions based on the voltage parameters.

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