CN114665909A - Radio frequency system, method for reducing SAR and wireless communication equipment - Google Patents
Radio frequency system, method for reducing SAR and wireless communication equipment Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/3827—Portable transceivers
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Abstract
The embodiment of the application provides a radio frequency system, a method for reducing SAR and wireless communication equipment. The radio frequency system comprises a radio frequency transceiver and a signal transmitting path, wherein the input end of the signal transmitting path is connected with the transmitting port of the radio frequency transceiver, the output end of the signal transmitting path is connected with an antenna unit, and the signal transmitting path comprises: an impedance transformation unit for dynamically matching the impedance of the signal transmission path; and the control unit is connected with the impedance conversion unit, and when the average SAR value in a preset time window is greater than or equal to a preset threshold value, the control unit adjusts the impedance value of the impedance conversion unit so as to enable the average SAR value in a standard time window to be smaller than the preset threshold value, wherein the preset time window and the standard time window have the same time starting point, and the preset time window is smaller than the standard time window.
Description
Technical Field
The present disclosure relates to the field of wireless communication technologies, and in particular, to a radio frequency system, a method for reducing SAR, and a wireless communication device.
Background
With the rapid development of information technology, wireless communication devices (such as smart phones) are becoming more and more popular, and as the functions of the wireless communication devices become more and more powerful, the transmission power thereof also becomes stronger, resulting in radiation effects on human bodies. The radiation effect generated by a wireless communication device is usually measured by a Specific Absorption Rate (SAR), and the larger the SAR value is, the larger the effect on the human body is; the smaller the effect conversely.
At present, the reduction of the SAR value is mainly achieved by reducing the radio frequency conducted power of the radio frequency system, but the lower transmission power affects the communication quality, and the user experience is poor.
Disclosure of Invention
The present application provides a radio frequency system, a method for reducing SAR, and a wireless communication device, so as to solve the above problems.
In a first aspect, a wireless communication device includes a radio frequency transceiver and a signal transmission path, an input end of the signal transmission path is connected to a transmission port of the radio frequency transceiver, and an output end of the signal transmission path is connected to an antenna unit, wherein the signal transmission path includes: an impedance transformation unit for dynamically matching the impedance of the signal transmission path; and the control unit is connected with the impedance conversion unit, and when the average SAR value in a preset time window is greater than or equal to a preset threshold value, the control unit adjusts the impedance value of the impedance conversion unit so as to enable the average SAR value in a standard time window to be smaller than the preset threshold value, wherein the preset time window and the standard time window have the same time starting point, and the preset time window is smaller than the standard time window.
As a possible implementation manner, the impedance transformation unit includes a plurality of impedance devices with different impedances and switches connected to each impedance device in a one-to-one correspondence manner, and the impedance transformation unit is configured to dynamically match the impedance of the signal transmission path according to switch conduction states corresponding to the impedance devices with different impedances.
As a possible implementation manner, a power amplifier is further configured in the signal transmission path, an input end of the power amplifier is connected to the radio frequency transceiver, and an output end of the power amplifier is connected to the impedance transformation unit.
As a possible implementation manner, the antenna unit includes a plurality of antennas, and the control unit is further configured to: and when the average SAR value in the preset time window is larger than or equal to the preset threshold, different antennas are selected to be switched on according to the performances of the antennas, so that the average SAR value in the standard time window is smaller than the preset threshold.
As a possible implementation, the impedance value of the impedance transformation unit is zero.
In a second aspect, a method for reducing SAR is provided, which is applied to a radio frequency system, the radio frequency system including a radio frequency transceiver and a signal transmission path, an input terminal of the signal transmission path is connected to a transmission port of the radio frequency transceiver, and an output terminal of the signal transmission path is connected to an antenna unit, wherein the signal transmission path includes an impedance transformation unit, and the method includes: acquiring an average SAR value in a preset time window; when the average SAR value in the preset time window is larger than or equal to a preset threshold value, adjusting the impedance value of the impedance transformation unit so that the average SAR value in a standard time window is smaller than the preset threshold value, wherein the preset time window and the standard time window have the same time starting point, and the preset time window is smaller than the standard time window.
As a possible implementation manner, the impedance transformation unit includes a plurality of impedance devices with different impedances and switches connected to each impedance device in a one-to-one correspondence manner, and the adjusting the impedance value of the impedance transformation unit so that the average SAR value in a standard time window is smaller than the preset threshold includes: and adjusting switch conducting states corresponding to impedance devices with different impedances in the impedance transformation unit so as to enable the average SAR value in the standard time window to be smaller than the preset threshold value.
As a possible implementation manner, a power amplifier is further configured in the signal transmission path, an input end of the power amplifier is connected with the radio frequency transceiver, and an output end of the power amplifier is connected with the impedance transformation unit.
As a possible implementation, the antenna unit includes a plurality of antennas, and the method further includes: and when the average SAR value in the preset time window is larger than or equal to the preset threshold, different antennas are selected to be switched on according to the performances of the antennas, so that the average SAR value in the standard time window is smaller than the preset threshold.
As a possible implementation, the impedance value of the impedance transformation unit is zero.
In a third aspect, a wireless communication device is provided, comprising the radio frequency system as described in the first aspect or the first aspect.
In a fourth aspect, there is provided a computer readable storage medium storing a computer program which, when executed, implements a method as claimed in any of the second or third aspects.
In a fifth aspect, there is provided a computer program product comprising executable code which, when executed, is capable of implementing a method as described in the second aspect or any of the ways of the second aspect.
The embodiment of the application provides a radio frequency system, an impedance conversion unit is arranged in a radio frequency signal transmitting path, when an average SAR value in a preset time window is larger than or equal to a preset threshold value, the impedance value of the impedance conversion unit is adjusted to dynamically adjust the radiation area and the power radiation intensity of an antenna unit, and further, the average SAR value of the antenna unit in the standard time window is smaller than the preset threshold value, so that the user experience is improved.
Drawings
Fig. 1 is a diagram illustrating a structure of a radio frequency system according to an embodiment of the present disclosure.
Fig. 2 is a diagram illustrating a structure of a transmit power adjustment procedure according to an embodiment of the present application.
Fig. 3 is a diagram illustrating an exemplary structure of a radio frequency system according to another embodiment of the present application.
Fig. 4 is a diagram illustrating a structure of a transmit power adjustment procedure according to another embodiment of the present application.
Fig. 5 is a diagram illustrating a structure of a SAR test result according to an embodiment of the present application.
Fig. 6 is a diagram illustrating a structure of a radio frequency system according to yet another embodiment of the present application.
Fig. 7 is a diagram illustrating a structure of a SAR test result according to another embodiment of the present application.
Fig. 8 is a schematic flowchart of a SAR reduction method according to an embodiment of the present application.
Detailed Description
The embodiments of the present application will be described below with reference to the drawings. In the following description, reference is made to the accompanying drawings which form a part hereof and in which is shown by way of illustration specific aspects of embodiments of the application or in which specific aspects of embodiments of the application may be employed. It should be understood that embodiments of the present application may be used in other ways and may include structural or logical changes not depicted in the drawings. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present application is defined by the appended claims. For example, it should be understood that the disclosure in connection with the described methods may equally apply to the corresponding apparatus or system for performing the methods, and vice versa. For example, if one or more particular method steps are described, the corresponding apparatus may comprise one or more units, such as functional units, to perform the described one or more method steps (e.g., a unit performs one or more steps, or multiple units, each of which performs one or more of the multiple steps), even if such one or more units are not explicitly described or illustrated in the figures. On the other hand, for example, if a particular apparatus is described based on one or more units, such as functional units, the corresponding method may comprise one step to perform the functionality of the one or more units (e.g., one step performs the functionality of the one or more units, or multiple steps, each of which performs the functionality of one or more of the plurality of units), even if such one or more steps are not explicitly described or illustrated in the figures. Further, it is to be understood that features of the various exemplary embodiments and/or aspects described herein may be combined with each other, unless explicitly stated otherwise.
It should be noted that the wireless communication device referred to in the present application may be any of various types of computer system devices that are mobile or portable and perform wireless communication. For example, the wireless communication device may be a mobile or smart phone (which may be, for example, an iPhone (TM) based phone, or an Android (TM) based phone), a portable gaming device (such as a Nintendo DS (TM), PlayStationery Portable (TM), Game Advance (TM), iPhone (TM)), a laptop, a Personal Digital Assistant (PDA), a portable Internet appliance, a music player, and a data storage device, other handheld devices, and other handheld devices such as watches, in-ear headphones, pendant, headphones, and the like. The wireless communication device may also be other wearable devices (e.g., such as electronic glasses, electronic clothing, electronic bracelets, electronic necklaces, electronic tattoos, electronic devices, smartwatches, or Head Mounted Displays (HMDs).
With the rapid development of information technology, wireless communication devices are also being updated iteratively. Taking a smartphone, which supports fifth generation mobile communication technologies, as an example, such wireless communication devices are leading users to move into the "supersonic" era of wireless communication at extremely high rates, extremely large capacities, and extremely low latency. Meanwhile, with the evolution of wireless communication devices represented by smart phones, the influence of electromagnetic radiation generated during the use of the wireless communication devices on human health is receiving wide public attention.
The specific absorption ratio SAR represents the amount of radiation that a living body (including a human body) is allowed to absorb per unit kg, defined as the electromagnetic power absorbed or consumed per unit mass of human tissue, in W/kg. The SAR value represents the effect of radiation on the body and is the most direct test value, SAR has data for the whole body, local, extremities, the lower the SAR value, the less the amount of radiation absorbed. According to SAR specifications, the radio frequency energy accumulated in the head or body during the wireless communication transmission of the device must not exceed a certain value. The radio frequency energy may be calculated by integrating the transmit power of the wireless communication device over a determined time window. SAR regulatory agencies in different countries and regions have slightly different requirements on SAR standards, and currently, the two international standards are 1.6W/kg of the Federal Communications Commission (FCC) and 2.0W/kg of the European Union.
Taking the FCC standard as an example, for radio frequency signals below 3GHz, the average SAR value within a time period of 100 seconds is required not to exceed the upper limit requirement of 1.6W/kg. However, the real-time SAR value may exceed 1.6W/kg, and it is only necessary to ensure that the average SAR value within the standard time window (e.g., 100 seconds) is controlled within the regulatory requirements. For radio frequency signals above 3GHz, the average SAR value within a time period of 60 seconds is required not to exceed the upper limit requirement of 1.6W/kg. Also real-time SAR values can exceed 1.6W/kg, just to ensure that the average SAR value over a standard time window (e.g., 60 seconds) is controlled within the regulatory requirements.
The following describes a SAR reduction method provided in the related art by taking the wireless communication device shown in fig. 1 as an example.
Referring to fig. 1, the Device Under Test (DUT) may refer to any one of the above wireless communication devices, such as a smart phone. The device under test may include a radio frequency system 100, and the radio frequency system 100 may be located inside the device under test. The radio frequency system 100 may include a radio frequency transceiver 101, a signal transmission path 102, and an antenna unit 103. An input end of the signal transmission path 102 may be connected with a transmission port TX of the radio frequency transceiver 101, and an output end of the signal transmission path 102 may be connected with the antenna unit 103. The frequency of the device under test radio frequency signal may be controlled by radio frequency transceiver 101, for example. The radio frequency signal transmitted from the transmission port TX of the radio frequency transceiver 101 may be radiated through the antenna unit 103. In some embodiments, a transmission power amplifier 104 may be disposed in the signal transmission path 102, and in this case, the radio frequency signal transmitted from the transmission port TX of the radio frequency transceiver 101 may be subjected to signal enhancement by the transmission power amplifier 104, and then the enhanced signal is fed to the antenna unit 103 to be radiated. In some embodiments, a receive power amplifier 105 may be configured in the signal receive path to improve the signal reception quality of the radio frequency system 100. The reception power amplifier 105 may be, for example, a low noise amplifier (LAN). Illustratively, the location of the antenna element 103 is given in the two-dimensional plan view 110 of the device under test.
At present, the radio frequency transceiver 101 is mainly used to control and reduce the radio frequency power (also referred to as the radio frequency conducted power of the device under test) transmitted by the transmission port TX to reduce the radio frequency transmission power of the antenna unit 103 (also referred to as the radio frequency transmission power of the device under test), so as to achieve the purpose of reducing the SAR value of the antenna unit 103. This approach is commonly referred to as fixed back-off rf power. As an example, if the maximum transmission power of the device under test is 23dBm, when the SAR back-off mechanism is activated or triggered, the device under test may control the transmission power through the radio frequency transceiver to back off by a fixed back-off value, such as 3dB, and the radio frequency power after the back-off is maintained at 20dBm for transmission. The low power transmission will cause the power of the device under test to reach the base station to be reduced correspondingly, and the signal-to-noise ratio (SNR) will also be reduced. The low SNR signal at the base station will increase the error rate of demodulation at the base station, which further affects the communication quality, and even may cause communication interruption, and finally affects the actual experience of the user.
In order to reduce the influence of lower transmission power on communication quality, a concept of a time-averaged specific absorption rate (TA-SAR) is proposed in the related art, and the transmission power is dynamically adjusted by a time-averaged algorithm to meet the SAR specification. That is, a technique for controlling radio frequency transmit power by a transceiver such that an average SAR value within a standard time window is not exceeded.
Referring to fig. 2, the P _ limit can be understood as the magnitude of the radio frequency power corresponding to the upper limit of the average SAR within the standard time window, and if the radio frequency power is higher than the P _ limit, the corresponding SAR value exceeds the upper limit threshold. It can be seen that compared to the conventional fixed back-off rf power, the implementation of TA-SAR may allow the real-time transmit power to be transmitted at a power higher than P _ limit for some time periods and at a power lower than P _ limit for some time periods, so as to achieve an average power less than or equal to P _ limit within a certain time window. Therefore, the network performance can be improved, and the effect of improving the user experience is achieved.
Implementation of TA-SAR may be at t1At maximum power (P) in a time period1) Transmit at arrival t2Time of daySince the average power value meets the Plimit limit requirement, a power back-off is required, i.e. at a lower power (P)2) And continuing to transmit. Due to t1Maximum transmit power in the time period, resulting in the time when t2Only at a lower, or even lowest, power when the time comes. And t is2Low power transmission after the moment still results in poor user experience; in addition, there is also some risk due to the need for frequent adjustment of the transmit power, for example, which may cause the transmit power amplifier to be easily burned out.
In order to solve the above problem, an embodiment of the present application provides a radio frequency system, where an impedance transformation unit is disposed in a radio frequency signal transmission path, and when an average SAR value in a preset time window is greater than or equal to a preset threshold, the impedance value of the impedance transformation unit is adjusted to dynamically adjust a radiation area and a power radiation intensity of an antenna unit, and further, the average SAR value of the antenna unit in the standard time window is smaller than the preset threshold, so as to improve user experience.
The radio frequency system in the embodiment of the present application is described in detail below with reference to fig. 3. As shown in fig. 3, the rf system 300 includes an rf transceiver 301, a signal transmission path 302, and an antenna unit 303. An input of the signal transmission path 302 may be connected to a transmission port TX of the radio frequency transceiver 301, and an output of the signal transmission path 302 may be connected to the antenna unit 103. The frequency of the device under test radio frequency signal may be controlled by the radio frequency transceiver 301. The radio frequency signal transmitted from the transmission port TX of the radio frequency transceiver 301 may be radiated through the antenna unit 303.
In some embodiments, the signal transmission path 302 may include an impedance transformation unit 306 and a control unit (not shown). The impedance transformation unit 306 may be used to dynamically match the impedance of the signal transmission path. The control unit may be connected to the impedance transformation unit 306, and when the average SAR value in the preset time window is greater than or equal to the preset threshold, the control unit may adjust the impedance value of the impedance transformation unit 306, so as to control the radiation area and the power radiation intensity of the antenna unit 303, and further, may make the average SAR value in the standard time window smaller than the preset threshold. Compared with the method for fixing the back-off radio frequency power in the related technology, the method and the device for adjusting the back-off radio frequency power in the embodiment of the application can improve the network performance and improve the user experience by dynamically adjusting the average SAR value in the standard time window.
In some embodiments, the impedance transformation unit 306 may refer to a device unit having a variable impedance. For example, the impedance transformation unit 306 may include a plurality of impedance devices with different impedances and switches connected to each impedance device in a one-to-one correspondence manner, and the impedance transformation unit 306 may dynamically match the impedance of the signal transmission path 302 according to the on states of the switches corresponding to the impedance devices with different impedances. As an example, the control unit may be connected to a switch in the impedance transformation unit 306, for example, and the control unit may adjust the on-states of switches corresponding to impedance devices with different impedances in the impedance transformation unit 306 so that the average SAR value in the standard time window is smaller than the preset threshold. The type of the impedance transformation unit 306 is not particularly limited in the embodiment of the application, for example, the impedance of the impedance transformation unit 306 may change in a jump manner, for example, the impedance transformation unit 306 may be a multi-stage impedance transformer. For another example, the impedance of the impedance transformation unit 306 may also be steplessly variable, for example, the impedance transformation unit 306 may be a gradual impedance transformer.
In some embodiments, a transmission power amplifier 304 may be further disposed in the signal transmission path 302, an input terminal of the power amplifier 304 is connected to the radio frequency transceiver 301, and an output terminal of the power amplifier 304 is connected to the impedance transformation unit 306. At this time, the radio frequency signal transmitted from the transmission port TX of the radio frequency transceiver 301 may be subjected to signal enhancement by the transmission power amplifier 304, and then the enhanced signal is fed to the antenna unit 303 to be radiated. In the embodiment of the present application, the resistance value of the impedance transformation unit 306 is dynamically adjusted to adjust the average SAR value in the standard time window to be lower than the preset threshold, so that the risk of easy burning of the transmission amplifier 304 due to frequent adjustment of the radio frequency transceiver 301 can be reduced. It should be understood that a receive power amplifier 305 may also be configured in the signal receive path to improve the signal reception quality of the rf system 300. The reception power amplifier 105 may be, for example, a low noise amplifier (LAN). Illustratively, the location of the antenna element 303 is given in a two-dimensional plan view 310 of the device under test.
In some embodiments, the antenna unit 303 may include multiple antennas, and the control unit may be connected to the multiple antennas. When the average SAR value in the preset time window is greater than or equal to the preset threshold, the control unit may select to turn on different antennas according to the antenna performance of the multiple antennas, so that the average SAR value of the multiple antennas in the standard time window is less than the preset threshold. Taking the directional diagram of the antenna as an example, each antenna in the multiple antennas has a different radiation directional diagram, and in the wireless communication process, according to different antenna performances, different antennas may be selectively turned on by the control unit (hereinafter, implementation of selectively turning on different antennas will be described with reference to fig. 6, and in particular, refer to the related description of fig. 6), so as to change the radio frequency radiation direction and the SAR hotspot distribution. That is, by selectively turning on different antennas, the SAR hot spot distribution can be changed, so that the TA-SAR value can be effectively reduced, so that the average SAR value of the antenna unit 303 (i.e., multiple antennas) in the standard time window is smaller than the preset threshold. By switching different antennas, the problem of poor network quality caused by low radio frequency transmitting power can be further improved, and user experience is further improved. At the same time, the risk of the transmit amplifier 304 being prone to burn out due to frequent switching of transmit power is also reduced. It should be noted that the average SAR value within the standard time window may be smaller than the preset threshold by adjusting the impedance value of the impedance transformation unit 306 and/or the conduction states of the plurality of antennas with different performances. For example, when the impedance value of the impedance transformation unit 306 is zero, the signal transmission path 302 at this time may be a conducting path, and at this time, the average SAR value within the standard time window may be smaller than the preset threshold value by only adjusting the conducting states of the multiple antennas.
It should be noted that the type of the control unit is not particularly limited in the embodiment of the present application, for example, the control unit may be a software algorithm or a piece of program code, and for example, the impedance value of the impedance transformation unit 306 may be adjusted by outputting a high/low level, such as the on/off state of a switch in the impedance transformation unit 306 may be controlled by the high/low level. For example, the control unit may be a hardware controller, and the control unit may be a Programmable Logic Controller (PLC), a control chip, or the like.
It should be noted that the standard time window in the embodiment of the present application may refer to a time interval set manually, and the standard time window may be set according to an international standard, for example, taking FCC as an example, for radio frequency signals below 3GHz, the standard time window may refer to continuous 100 s; for radio frequency signals above 3GHz, the standard time window may refer to 60s in succession. The embodiments of the present application do not specifically limit this. It is understood that the preset time window in the embodiment of the present application may also refer to a period of time set manually, the preset time window and the standard time window have the same time starting point, and the preset time window is smaller than the standard time window.
It should be noted that the preset threshold of the TA-SAR may be set according to an international standard, for example, taking the FCC standard as an example, the preset threshold of the SAR may be set to 1.6W/kg; for another example, taking the eu standard as an example, the preset threshold of the SAR may be set to be 2.0W/kg, which is not specifically limited in this embodiment of the present application.
It should be noted that the antenna unit 303 may refer to an antenna element for radio frequency communication. The antenna unit 303 may include a plurality of antennas. The multiple antennas may have different antenna performance. The antenna performance of the multiple antennas may include, for example: directional diagram, impedance, efficiency, frequency-selecting characteristic, etc., which are not specifically limited in this application. It should be understood that the antenna unit 303 may be a separately provided antenna unit, or may be located on a middle frame (metal middle frame) of the wireless communication device. That is, the antenna unit 303 may belong to a part of the middle frame, and this is not limited in this embodiment.
To further illustrate the rf system in the embodiment of the present application, the following describes the process of adjusting TA-SAR in detail with reference to fig. 4 and 5.
As shown in fig. 4, the impedance transformation unit 406 in the embodiment of the present application may be, for example, an impedance device including 3 different impedances, and a contact switch (c) connected to each impedance device in a one-to-one correspondence. At this time, the on-off state of the contact switch (c) may be controlled by combining a software algorithm to adjust the impedance state of the impedance transformation unit 406, so as to achieve the purpose of adjusting the radiation area (the area marked by the dashed line frame in the plan view 410) and the radiation intensity of the antenna unit 403, and further, to make the average SAR value of the antenna unit 403 within the standard time window smaller than the preset threshold. It should be understood that the impedance transformation unit 403 may have different impedance values when the contact switch (c) has different on-states. The following description will be given by way of example with reference to the on state of the contact switch (c).
When the switch is closed and opened, the SAR value tested in the state is SAR4_1, and the radiation area is shown as a dashed box diagram in FIG. 4A. When the switch is closed and opened, the SAR value tested in this state is SAR4_2, and the radiation area is shown as a dashed box diagram in FIG. 4B. When the switch (C) is closed and (C) is opened, the SAR value tested in this state is SAR4_3, and the radiation area is shown by the dashed box diagram in fig. 4C.
As shown in fig. 5, it can be seen that, by adjusting the impedance converter 406, the durations of the SAR4_1, SAR4_2, and SAR4_3 are counted in real time, and an average value calculation is performed, and when the average SAR value within a preset time window approaches a preset threshold (such as may be represented by SAR _ limit), the impedance state of the impedance conversion unit 406 is forced to be switched to a state where the SAR value is lower than the SAR _ limit. That is to say, when the device to be tested normally works, the SAR4_1 value in a certain impedance state can be lower than the SAR _ limit, so that the combined state that the values of the partial states SAR4_2 and SAR4_3 are higher than the SAR _ limit and the value of the partial state SAR4_1 is lower than the SAR _ limit can be realized, the radiation area of the antenna unit 403 is changed, and finally the average SAR value is lower than the SAR _ limit.
As can be seen from the above, the radiation area and the radiation intensity of the antenna unit 403 can be changed by adjusting the impedance transformation unit 406, so that the SAR value in a certain impedance state is lower than the preset threshold, and thus, a combined state in which the SAR value in a partial state is higher than the preset threshold and the SAR value in a partial state is lower than the preset threshold can be realized, and finally, the average SAR value in the standard time window is lower than the preset threshold. In addition, the radio frequency transmission power in the embodiment of the present application does not need to be adjusted in real time, so that the risk caused by frequent change of the radio frequency transmission power (for example, the risk of burning out the transmission power amplifier 404) is reduced.
Another rf system proposed by the embodiment of the present application is described in detail below with reference to fig. 6. As shown in fig. 6, the radio frequency system 600 may include a radio frequency transceiver 601, an antenna unit 603, a transmission power amplifier 604, and a reception power amplifier 605. The rf signal transmitted from the transmitting port TX of the rf transceiver 601 may be signal-enhanced by the transmitting power amplifier 604, and then the enhanced signal is fed to the antenna element 603 to be radiated. Illustratively, a receive power amplifier 605 may be configured in the signal receive path to improve the signal reception quality of the radio frequency system 600.
In some embodiments, a control unit (not shown in the figures) may be connected to the antenna unit 603, and the antenna unit 603 may refer to an antenna element for radio frequency communication. The antenna unit 603 may include a plurality of antennas and switches connected to each antenna in a one-to-one correspondence.
The multiple antennas may have different antenna performance. The antenna performance of the plurality of antennas includes: directional diagram, impedance, efficiency, frequency-selecting characteristic, etc., which are not specifically limited in this application. As an example, the antenna unit 603 may include three antennas (antenna 604_1, antenna 604_2, and antenna 604_3), and the positions of the antenna 604_1, antenna 604_2, and antenna 604_3 are exemplarily given in the two-dimensional plan view 610 of the device under test. As an example, the switch in this embodiment may be a contact switch element, and in this case, the conduction states of the multiple antennas may be controlled in combination with a software algorithm.
In some embodiments, when the average SAR value within the preset time window is greater than or equal to the preset threshold, the control unit may select to turn on different antennas according to the antenna performance of the multiple antennas, so that the average SAR value within the standard time window of the multiple antennas is less than the preset threshold. Next, the selective conduction process of multiple antennas will be described with reference to fig. 6 and 7 by taking the directional diagram performance of the antennas as an example.
When the antenna 604_1 is closed, the SAR value tested in this state is SAR6_ 1; when the antenna 604_2 is closed, the SAR value tested in this state is SAR6_ 2; when the antenna 604_3 is closed, the SAR value tested in this state is SAR6_ 3.
As shown in fig. 7, it can be seen that, in the normal use process of the wireless communication device, different antennas are selected to be turned on according to different antenna performances of the multiple antennas, the durations of the SAR6_1, SAR6_2, and SAR6_3 are counted in real time, and an average value is calculated, and when the average SAR value within a preset time window approaches SAR _ limit, the on-state of the current antenna of the antenna can be forcibly switched to an on-state in which the SAR value is lower than SAR _ limit. That is to say, when the device to be tested normally works, different antennas can be selected to be turned on to achieve that the value of the SAR6_1 is lower than the SAR _ limit, so that the combined state that the values of the partial state SAR6_2 and SAR6_3 are higher than the SAR _ limit and the value of the partial state SAR6_1 is lower than the SAR _ limit can be achieved. Meanwhile, different antennas have different radiation areas and radiation intensities, and finally the average SAR value is lower than SAR _ limit.
According to the above, by dynamically switching the conduction states of the different antennas, the radiation area and the radiation intensity of the first antenna can be changed, so that the average SAR value in the standard time window is finally lower than the preset threshold value. In addition, the radio frequency transmission power in the embodiment of the present application does not need to be adjusted in real time, so as to reduce the risk caused by frequent changes of the radio frequency transmission power (for example, the risk of burning out the transmission power amplifier 604).
The embodiment of the present application also provides a wireless communication device, which may include any one of the radio frequency systems in the foregoing.
The apparatus embodiments of the present disclosure are described in detail above in conjunction with fig. 1-7, and the method embodiments of the present disclosure are described in detail below in conjunction with fig. 8. It is to be understood that the description of the method embodiments corresponds to the description of the apparatus embodiments, and therefore reference may be made to the preceding apparatus embodiments for parts which are not described in detail.
Fig. 8 is a schematic flowchart of a method for reducing SAR according to an embodiment of the present application. The method of fig. 8 may be applied to any one of the radio frequency systems, where the radio frequency system includes a radio frequency transceiver and a signal transmission path, an input end of the signal transmission path is connected to a transmission port of the radio frequency transceiver, and an output end of the signal transmission path is connected to the antenna unit, where the signal transmission path includes an impedance transformation unit and a control unit, and the method 800 for reducing SAR may include steps S820 to S840.
In step S820, an average SAR value within a preset time window is obtained;
in step S840, when the average SAR value in the preset time window is greater than or equal to a preset threshold, adjusting the impedance value of the impedance transformation unit so that the average SAR value in a standard time window is smaller than the preset threshold, where the preset time window and the standard time window have the same time starting point, and the preset time window is smaller than the standard time window.
Optionally, the impedance transformation unit includes a plurality of impedance devices with different impedances and switches connected in a one-to-one correspondence with each impedance device, and the adjusting the impedance value of the impedance transformation unit so that an average SAR value in a standard time window is smaller than the preset threshold includes: and adjusting switch conducting states corresponding to impedance devices with different impedances in the impedance transformation unit so as to enable the average SAR value in the standard time window to be smaller than the preset threshold value.
Optionally, a power amplifier is further configured in the signal transmission path, an input end of the power amplifier is connected to the radio frequency transceiver, and an output end of the power amplifier is connected to the impedance transformation unit.
Optionally, the antenna unit includes a plurality of antennas, and the method further includes: and when the average SAR value in the preset time window is larger than or equal to the preset threshold, different antennas are selected to be switched on according to the performances of the antennas, so that the average SAR value in the standard time window is smaller than the preset threshold.
Optionally, the impedance value of the impedance transformation unit is zero.
In the above embodiments, all or part of the implementation may be realized by software, hardware, firmware, or any other combination. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions described in accordance with the embodiments of the disclosure are, in whole or in part, generated when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., Digital Video Disk (DVD)), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
In the several embodiments provided in the present disclosure, it should be understood that the disclosed system, apparatus, and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure, and all the changes or substitutions should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.
Claims (11)
1. A radio frequency system, comprising a radio frequency transceiver and a signal transmission path, wherein an input terminal of the signal transmission path is connected to a transmission port of the radio frequency transceiver, and an output terminal of the signal transmission path is connected to an antenna unit, wherein the signal transmission path comprises:
an impedance transformation unit for dynamically matching the impedance of the signal transmission path; and
and the control unit is connected with the impedance conversion unit, and when the average SAR value in a preset time window is greater than or equal to a preset threshold value, the control unit adjusts the impedance value of the impedance conversion unit so as to enable the average SAR value in a standard time window to be smaller than the preset threshold value, wherein the preset time window and the standard time window have the same time starting point, and the preset time window is smaller than the standard time window.
2. The rf system according to claim 1, wherein the impedance transforming unit includes a plurality of impedance devices with different impedances and switches connected to each impedance device in a one-to-one correspondence, and the impedance transforming unit is configured to dynamically match the impedance of the signal transmission path according to on states of the switches corresponding to the impedance devices with different impedances.
3. The radio frequency system according to claim 1, wherein a power amplifier is further disposed in the signal transmission path, an input terminal of the power amplifier is connected to the radio frequency transceiver, and an output terminal of the power amplifier is connected to the impedance transformation unit.
4. The radio frequency system of claim 1, wherein the antenna unit comprises a plurality of antennas, and the control unit is further configured to:
and when the average SAR value in the preset time window is larger than or equal to the preset threshold, different antennas are selected to be switched on according to the performances of the antennas, so that the average SAR value in the standard time window is smaller than the preset threshold.
5. The radio frequency system according to claim 4, wherein the impedance value of the impedance transformation unit is zero.
6. A method for reducing SAR, applied to a radio frequency system, the radio frequency system including a radio frequency transceiver and a signal transmission path, an input terminal of the signal transmission path being connected to a transmission port of the radio frequency transceiver, and an output terminal of the signal transmission path being connected to an antenna unit, wherein the signal transmission path includes an impedance transformation unit, the method comprising:
acquiring an average SAR value in a preset time window;
when the average SAR value in the preset time window is larger than or equal to a preset threshold value, adjusting the impedance value of the impedance transformation unit so that the average SAR value in a standard time window is smaller than the preset threshold value, wherein the preset time window and the standard time window have the same time starting point, and the preset time window is smaller than the standard time window.
7. The method of claim 6, wherein the impedance transformation unit comprises a plurality of impedance devices of different impedances and switches connected in one-to-one correspondence with each impedance device, and wherein adjusting the impedance value of the impedance transformation unit such that the average SAR value within a standard time window is less than the preset threshold comprises:
and adjusting switch conducting states corresponding to impedance devices with different impedances in the impedance transformation unit so as to enable the average SAR value in the standard time window to be smaller than the preset threshold value.
8. The method of claim 6, wherein a power amplifier is further disposed in the signal transmission path, an input of the power amplifier is connected to the radio frequency transceiver, and an output of the power amplifier is connected to the impedance transformation unit.
9. The method of claim 6, wherein the antenna unit comprises a plurality of antennas, the method further comprising:
and when the average SAR value in the preset time window is larger than or equal to the preset threshold, different antennas are selected to be switched on according to the performances of the antennas, so that the average SAR value in the standard time window is smaller than the preset threshold.
10. The method of claim 9, wherein the impedance value of the impedance transformation unit is zero.
11. A wireless communication device, comprising:
the radio frequency system of any one of claims 1-5.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210296901.4A CN114665909A (en) | 2022-03-24 | 2022-03-24 | Radio frequency system, method for reducing SAR and wireless communication equipment |
| PCT/CN2022/139293 WO2023179116A1 (en) | 2022-03-24 | 2022-12-15 | Radio frequency system, method for reducing sar, and wireless communication device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210296901.4A CN114665909A (en) | 2022-03-24 | 2022-03-24 | Radio frequency system, method for reducing SAR and wireless communication equipment |
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| WO2023179116A1 (en) * | 2022-03-24 | 2023-09-28 | Oppo广东移动通信有限公司 | Radio frequency system, method for reducing sar, and wireless communication device |
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