CN113489554B - Communication equipment and SAR (specific absorption rate) reducing method thereof - Google Patents
Communication equipment and SAR (specific absorption rate) reducing method thereof Download PDFInfo
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- CN113489554B CN113489554B CN202110756318.2A CN202110756318A CN113489554B CN 113489554 B CN113489554 B CN 113489554B CN 202110756318 A CN202110756318 A CN 202110756318A CN 113489554 B CN113489554 B CN 113489554B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/101—Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/288—Provisions within MR facilities for enhancing safety during MR, e.g. reduction of the specific absorption rate [SAR], detection of ferromagnetic objects in the scanner room
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The embodiment of the invention provides a communication device and a method for reducing SAR of the communication device, wherein the communication device comprises an antenna module, a capacitor module, a control module and an RF detection module; the capacitive module is used for detecting whether a user approaches the antenna module, and when the capacitive module detects that the user approaches the antenna module, a first signal is sent to the control module; the RF detection module is used for detecting the working frequency band of the antenna module in real time; the control module is used for acquiring the working frequency band of the antenna module from the RF detection module after receiving the first signal, detecting whether the working frequency band comprises an SAR exceeding frequency band value, and sending an SAR reducing instruction to the antenna module if the working frequency band comprises the SAR exceeding frequency band value; the antenna module is used for adjusting the current transmission loop of the antenna into a single-frequency point annular loop after receiving the SAR lowering instruction. The embodiment of the invention provides a communication device and a method for reducing SAR of the communication device, which can ensure TRP of a communication module and reduce SAR of the communication device.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a communication device and a method for reducing SAR of the communication device.
Background
Along with the development of technology, the requirements of people on the appearance and performance of communication equipment such as tablet computers and mobile phones are higher and higher, the metal body can meet the aesthetic requirements of customers on the appearance, the overall structural strength of the whole machine can be improved, and the design of the communication equipment such as tablet computers and mobile phones in the industry tends to be popular. In this popular trend, the design and debugging of the antenna is greatly difficult due to the introduction of the metal frame. In order to achieve better communication performance, most manufacturers currently consider only how to improve the TRP (Total radiated power, total radiation power) and TIS (Total isotropic sensitivity, total radiation sensitivity) performance of an antenna basically when designing the antenna, and often neglect the index requirements of SAR (Specific Absorption Rate, electromagnetic wave absorption ratio).
Better antenna performance tends to produce stronger electromagnetic radiation, which induces electromagnetic fields in the human body when these handheld communication devices are in close proximity to human tissue during normal operation. The industry introduces specific absorption of biological doses to characterize the extent to which electromagnetic radiation affects the human body. In order to ensure that electromagnetic radiation affects the human body in a safe range, a series of standards for electromagnetic radiation are established in countries around the world and related organizations. SAR is defined as the electromagnetic power absorbed or consumed by a unit mass of human tissue per unit time. In practice, SAR is a measured value in W/kg. The SAR value indicates how much the heat energy of the mobile communication device may have an effect on the human body, and the larger the value is, the larger the effect on the human body is, and vice versa.
Currently, the existing SAR reduction scheme:
1. the SAR is reduced by adding a wave absorbing material or a magnetic sheet, etc. to the antenna by absorption and shielding, which affects the directivity of the antenna and the overall TRP performance.
2. Directly reducing the conducted test power, this way directly reduces the TRP performance of the antenna.
Both schemes can directly influence the TRP performance of an antenna, and for some places with larger signal interference or weaker signals, the communication equipment adopting the two methods for reducing SAR can directly appear the phenomena of call failure, connection failure, internet surfing and even network dropping.
Disclosure of Invention
The embodiment of the invention provides a communication device and a method for reducing SAR of the communication device, which can ensure TRP of a communication module and reduce SAR of the communication device.
In a first aspect, an embodiment of the present invention provides a communication device, including an antenna module, a capacitance module, a control module, and an RF detection module;
the capacitive module is connected with the antenna module and is used for detecting whether a user approaches the antenna module, and when the user approaches the antenna module, a first signal is sent to the control module;
the RF detection module is connected with the antenna module and is used for detecting the working frequency band of the antenna module in real time;
the control module is connected with the RF detection module, and is used for acquiring the working frequency band of the antenna module from the RF detection module after receiving the first signal, detecting whether the working frequency band comprises an SAR exceeding frequency band value, and sending an SAR reducing instruction to the antenna module if the working frequency band comprises the SAR exceeding frequency band value;
the antenna module comprises an antenna, and the antenna module is used for adjusting a current transmission loop of the antenna into a single-frequency point annular loop after receiving the SAR lowering instruction.
Optionally, the antenna module further includes a first tuning switch, a second tuning switch, a third tuning switch, a fourth tuning switch, a first ground feed point, a second ground feed point, a third ground feed point, and a signal feed point; the first ground feed point, the second ground feed point, the third ground feed point and the signal feed point are connected with the same side of the antenna, and the second ground feed point and the signal feed point are positioned between the first ground feed point and the third ground feed point;
when the second tuning switch is in a connection state with the signal feed point and the third tuning switch is in a connection state with the second ground feed point, a loop from the second tuning switch to the third tuning switch is a single-frequency point annular loop;
and the antenna module is used for controlling the first tuning switch and the first ground feed point to be switched from a connection state to a disconnection state after receiving the SAR lowering command, controlling the second tuning switch and the signal feed point to be connected, controlling the third tuning switch and the second ground feed point to be switched from the disconnection state to the connection state, and controlling the fourth tuning switch and the third ground feed point to be switched from the connection state to the disconnection state.
Optionally, the capacitance module includes a detection capacitance, a capacitance sensor, a first storage unit and a first control unit;
the capacitive sensor is connected with the detection capacitor in parallel, and is used for detecting the capacitance value of the detection capacitor;
the first storage unit is connected with the first control unit and is used for storing a standard capacitance value;
the first control unit is connected with the capacitance sensor, and is used for acquiring the capacitance value of the detection capacitor from the capacitance sensor, acquiring the standard capacitance value from the first storage unit, comparing the capacitance value of the detection capacitor with the standard capacitance value, and sending a first signal to the control module if the capacitance value of the detection capacitor is larger than the standard capacitance value.
Optionally, the control module includes a BB control unit and a second storage unit;
the second storage unit is connected with the BB control unit and is used for storing SAR superscalar frequency band values;
the BB control unit is connected with the capacitor module, acquires the working frequency band of the antenna module from the RF detection module and the SAR out-of-standard frequency band value from the second storage unit after receiving the first signal, compares the working frequency band of the antenna module with the SAR out-of-standard frequency band value, detects whether the working frequency band of the antenna module comprises the SAR out-of-standard frequency band value, and sends an SAR lowering instruction to the antenna module if the working frequency band of the antenna module comprises the SAR out-of-standard frequency band value.
Optionally, the RF detection module includes an RF detection unit and a second control unit;
the RF detection unit is connected with the second control unit and is used for detecting the working frequency range of the antenna module in real time;
the second control unit is connected with the capacitor module and is used for judging whether the working frequency band detected by the RF detection unit changes or not, and if the working frequency band of the antenna module is judged to change, a second signal is sent to the capacitor module.
Optionally, the first control unit is configured to control the capacitance sensor to detect a capacitance value of the detection capacitor after receiving the second signal.
Optionally, the BB control unit is further configured to send a third signal to the first control unit while sending a SAR reduction instruction to the antenna module;
the first control unit is used for controlling the capacitance sensor to detect the capacitance value of the detection capacitor in real time after receiving the third signal, and sending a fourth signal to the control module if the first control unit detects that the capacitance value of the detection capacitor is within the standard capacitance value range;
the control module is used for sending an SAR reducing relieving instruction to the antenna module after receiving the fourth signal;
and the antenna module is used for controlling the first tuning switch and the first ground feed point to be switched from the disconnection state to the connection state after receiving the SAR reducing relieving instruction, controlling the second tuning switch and the signal feed point to still keep the connection state, controlling the third tuning switch and the second ground feed point to be switched from the connection state to the disconnection state, and controlling the fourth tuning switch and the third ground feed point to be switched from the disconnection state to the connection state, so that the default working mode of the antenna module is restored.
Optionally, the total length of the single-frequency point annular loop is one quarter of a wavelength corresponding to the center frequency of the SAR standard exceeding frequency band value.
In a second aspect, an embodiment of the present invention provides a method for reducing SAR of a communication device, including:
the capacitive module detects whether a user approaches the antenna module, and when the user approaches the antenna module, a first signal is sent to the control module;
the RF detection module detects the working frequency band of the antenna module in real time;
the control module acquires the working frequency band of the antenna module from the RF detection module after receiving the first signal, detects whether the working frequency band comprises an SAR exceeding frequency band value, and sends an SAR reducing instruction to the antenna module if the working frequency band comprises the SAR exceeding frequency band value;
the antenna module comprises an antenna, and after receiving the SAR lowering instruction, the antenna module adjusts a current transmission loop of the antenna into a single-frequency point annular loop.
Optionally, the antenna module further includes a first tuning switch, a second tuning switch, a third tuning switch, a fourth tuning switch, a first ground feed point, a second ground feed point, a third ground feed point, and a signal feed point; the first ground feed point, the second ground feed point, the third ground feed point and the signal feed point are connected with the same side of the antenna, and the second ground feed point and the signal feed point are positioned between the first ground feed point and the third ground feed point;
when the second tuning switch is in a connection state with the signal feed point and the third tuning switch is in a connection state with the second ground feed point, a loop from the second tuning switch to the third tuning switch is a single-frequency point annular loop;
after receiving the SAR lowering command, the antenna module controls the first tuning switch and the first ground feed point to be switched from a connection state to a disconnection state, controls the second tuning switch and the signal feed point to be connected, controls the third tuning switch and the second ground feed point to be switched from the disconnection state to the connection state, and controls the fourth tuning switch and the third ground feed point to be switched from the connection state to the disconnection state.
The embodiment of the invention provides communication equipment, which is characterized in that whether the communication equipment is close to a user is detected through a capacitor module, a first signal is sent to a control module when the communication equipment is detected to be close to the user, an RF detection module is used for detecting the working frequency range of an antenna module, the control module is used for judging whether the working frequency range of the antenna module comprises an SAR exceeding frequency range value, when the control module receives the first signal and judges that the current working frequency range of the antenna module comprises the SAR exceeding frequency range value, an SAR lowering instruction is sent to the antenna module, after the antenna module receives the SAR lowering instruction, a current transmission loop of an antenna is adjusted to be a single-frequency point annular loop, and the single-frequency point annular loop can ensure the TRP of the communication equipment and also can lower an electric field, so that the SAR of the communication equipment is lowered. The embodiment of the invention provides communication equipment, which can ensure the TRP of a communication module and reduce SAR of the communication equipment.
Drawings
Fig. 1 is a schematic structural diagram of a communication device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a single-frequency loop antenna;
fig. 3 is a schematic structural diagram of an antenna module according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another antenna module according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of still another communication device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of still another communication device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of still another communication device according to an embodiment of the present invention;
fig. 8 is a flowchart of a method for reducing SAR of a communication device according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in further detail below with reference to the drawings and examples. It should be understood that the particular embodiments described herein are illustrative only and are not limiting of embodiments of the invention. It should be further noted that, for convenience of description, only some, but not all of the structures related to the embodiments of the present invention are shown in the drawings.
Fig. 1 is a schematic structural diagram of a communication device according to an embodiment of the present invention, and referring to fig. 1, the communication device includes an antenna module 110, a capacitor module 120, a control module 130, and an RF detection module 140; the capacitive module 120 is connected to the antenna module 110, and the capacitive module 120 is configured to detect whether a user approaches the antenna module 110, and send a first signal to the control module 130 when detecting that the user approaches the antenna module 110; the RF detection module 140 is connected to the antenna module 110, and the RF detection module 140 is configured to detect an operating frequency band of the antenna module 110 in real time; the control module 130 is connected to the RF detection module 140, and the control module 130 is configured to obtain, after receiving the first signal, a working frequency band of the antenna module 110 from the RF detection module 140, and detect whether the working frequency band includes an SAR standard exceeding frequency band value, and if the working frequency band is detected to include the SAR standard exceeding frequency band value, send an SAR lowering instruction to the antenna module 110; the antenna module 110 includes an antenna, and the antenna module 110 is configured to adjust a current transmission loop of the antenna to a single-frequency loop after receiving the SAR reduction command.
In particular, as the user is closer to the communication device, the electromagnetic power absorbed by the user will increase. After the antenna design in the antenna module 110 is completed, the antenna factory or the SAR authentication detection center can detect the situations of the SAR exceeding in which frequency bands of the antenna occur, and these frequency bands are called SAR exceeding frequency band values. When the control module 130 receives the first signal sent by the capacitor module 120 and detects that the operating frequency band of the antenna module 110 includes the SAR exceeding frequency band value, a SAR decreasing instruction is sent to the antenna module 110, and after the antenna module 110 receives the SAR decreasing instruction, the antenna in the antenna module 110 forms a single-frequency loop, where the single-frequency loop indicates that the frequency range of the electromagnetic wave currently transmitted by the antenna module 110 is within a narrower frequency band, but not within a wide frequency range, and the single-frequency loop also indicates that the current transmission loop in the antenna is annular. In most cases, the SAR value exceeds the standard because the field strength direction is consistent due to the antenna trace form, so that the peak value of the SAR is higher, and the SAR in the communication equipment exceeds the standard. Fig. 2 is a schematic structural diagram of a single-frequency loop antenna, referring to fig. 2, the current on the single-frequency loop may be regarded as composed of a plurality of small current elements, and the current elements I are taken from both sides of the single-frequency loop 1 And I 2 According to the basic theory of short electric dipole field, the fields generated by two current elements are E 1 And E is 2 By means of current element I 1 And I 2 The case of reversal is exemplified when the two current elements are of exactly equal value, i.e. I 1 ＝-I 2 Current element I 1 And I 2 Superimposed field E r Is 0. The magnitude of the electric field determines the magnitude of the SAR value, so that the purpose of reducing the SAR is also realized after the magnitude of the electric field is reduced. The current design of communication equipment is multi-band and wideband design requirement, and the antenna wiring is basically fullThe Over The Air (OTA) performance is dominant, and it is difficult to achieve compatibility between TRP and SAR values. In this embodiment, the antenna trace in the antenna module 110 forms a single-frequency loop, so that on one hand, the antenna works in a narrow frequency band to enable the communication module to meet TRP, and on the other hand, the SAR of the communication device can be reduced by reducing the size of the electric field.
The embodiment provides a communication device, detect whether the communication device is close to the user through the electric capacity module, send first signal to control module when detecting that the communication device is close to the user, detect antenna module's work frequency channel through RF detection module, judge whether antenna module's work frequency channel includes SAR superscalar frequency channel value through control module, when control module received first signal and judge that antenna module current work frequency channel includes SAR superscalar frequency channel value, then send the instruction of falling SAR to antenna module, after antenna module received the instruction of falling SAR, adjust the electric current transmission loop of antenna into a single frequency point loop, single frequency point loop can guarantee the TRP of communication device, single frequency point loop also can reduce the electric field, thereby reduce communication device's SAR. The embodiment provides a communication device, which can ensure the TRP of a communication module and reduce SAR of the communication device.
Optionally, fig. 3 is a schematic structural diagram of an antenna module provided by an embodiment of the present invention, fig. 4 is a schematic structural diagram of another antenna module provided by an embodiment of the present invention, and referring to fig. 3 and fig. 4, the antenna module 110 further includes a first tuning switch SP4T1, a second tuning switch main, a third tuning switch SP4T2, a fourth tuning switch SP4T3, a first ground feed point a, a second ground feed point C, a third ground feed point D, and a signal feed point B; the first ground feed point A, the second ground feed point C, the third ground feed point D and the signal feed point B are connected with the same side of the antenna, and the second ground feed point C and the signal feed point B are positioned between the first ground feed point A and the third ground feed point D; when the second tuning switch main is in a connection state with the signal feed point B and the third tuning switch SP4T2 is in a connection state with the second ground feed point C (as shown in fig. 3), the loop from the second tuning switch main to the third tuning switch SP4T2 is a single-frequency point loop; the antenna module 110 is configured to control the first tuning switch SP4T1 and the first ground feed point a to change from a connection state to a disconnection state after receiving the SAR reduction command, control the second tuning switch main to be connected with the signal feed point B, control the third tuning switch SP4T2 and the second ground feed point C to change from a disconnection state to a connection state, and control the fourth tuning switch SP4T3 and the third ground feed point D to change from a connection state to a disconnection state.
Specifically, before the antenna module 110 does not receive the SAR reduction command, the first tuning switch SP4T1 is in a connection state with the first ground feed point a, the second tuning switch main is in a connection state with the signal feed point B, the third tuning switch SP4T2 is in a disconnection state with the second ground feed point C, the fourth tuning switch SP4T3 is in a connection state with the third ground feed point D (as shown in fig. 4), and the first current I in the antenna a The second tuning switch main flows to the first tuning switch SP4T1, the antenna between the second tuning switch main and the first tuning switch SP4T1 are used for resonance tuning of the medium-high frequency point, and the second current I in the antenna b The second tuning switch main flows to the fourth tuning switch SP4T3, the antenna between the second tuning switch main and the fourth tuning switch SP4T3 are used for resonance tuning of the low-frequency band frequency point, such an antenna structure is a default working state of the antenna module 110, the antenna of the antenna module 110 in the default working state is a broadband antenna, and the broadband antenna has the function of ensuring that all the communication frequency bands supported by the communication device provided by the embodiment have better TRP and TIS performances. After the antenna module 110 receives the SAR reducing instruction, the first tuning switch SP4T1 is disconnected from the first ground feed point a, the second tuning switch main is still connected to the signal feed point B, the third tuning switch SP4T2 is connected to the second ground feed point C, and the fourth tuning switch SP4T3 is disconnected from the third ground feed point D, so as to form a single-frequency loop antenna, where the arrow trend in fig. 3 is the current transmission direction of the single-frequency loop antenna.
The antenna module 110 provided in this embodiment includes a plurality of tuning switches, and performs antenna recombination with the metal frame 111 through the plurality of tuning switches, so as to realize flexibility and variability of antenna forms, thereby reducing SAR of the communication device. Taking a single-frequency loop antenna as an example for explanation, referring to fig. 3, the single-frequency loop antenna is composed of a first line segment connecting the second tuning switch main and the signal feed point B, a second line segment connecting the signal feed point B and the second ground feed point C, and a third line segment and a fourth line segment connecting the second ground feed point C and the third tuning switch SP4T 2; the second line segment includes a first sub-line segment connecting the signal feed point B and the metal frame 111, a second sub-line segment connecting the second ground feed point C and the metal frame 111, and a partial line segment of the metal frame 111. The first line segment is parallel to the third line segment, and a part of the second line segment belonging to the metal frame 111 is parallel to the fourth line segment.
Optionally, fig. 5 is a schematic structural diagram of still another communication device according to an embodiment of the present invention, and referring to fig. 5, a capacitance module 120 includes a detection capacitance 121, a capacitance sensor 122, a first storage unit 123, and a first control unit 124; the capacitance sensor 122 is connected in parallel with the detection capacitor 121, and the capacitance sensor 122 is used for detecting the capacitance value of the detection capacitor 121; the first storage unit 123 is connected to the first control unit 124, and the first storage unit 123 is used for storing a standard capacitance value; the first control unit 124 is connected to the capacitance sensor 122, where the first control unit 124 is configured to obtain the capacitance value of the detection capacitor 121 from the capacitance sensor 122 and obtain the standard capacitance value from the first storage unit 123, compare the capacitance value of the detection capacitor 121 with the standard capacitance value, and send a first signal to the control module 130 if the capacitance value of the detection capacitor 121 is greater than the standard capacitance value.
Specifically, the first control unit 124 is connected to the control module 130. The detection capacitor 121 is connected with the signal feed point B in the antenna module 110, the detection capacitor 121 is used for detecting the sensing area and the distance between the user and the communication device, when the sensing area between the user and the communication device is increased and the distance is reduced, the capacitance value of the detection capacitor 121 is increased, the capacitance sensor 122 is used for detecting the capacitance value of the detection capacitor 121, the first control unit 124 compares the capacitance value of the detection capacitor 121 obtained from the capacitance sensor 122 with the standard capacitance value, when the capacitance value of the detection capacitor 121 is greater than the standard capacitance value, the electromagnetic power which is absorbed by the user currently is possibly out of standard, the first signal needs to be sent to the control module 130, when the capacitance value of the detection capacitor 121 is smaller than or equal to the standard capacitance value, the electromagnetic power which is absorbed by the user currently is according to the standard value is indicated, the first control unit 124 does not need to send the first signal to the control module 130, and the communication device does not need to drop SAR. The conventional communication device checks the distance between the user and the communication device through the induction coil, and because the induction coil has large area, high cost and limitation in layout, the communication device needs to be placed around the antenna to detect whether the user is close to the antenna, and has a certain influence on the antenna, the communication device provided in this embodiment reduces the cost and layout space of the communication device by using the detection capacitor 121, and does not influence the working performance of the antenna, in addition, the communication module provided in this embodiment judges whether the user is close to the communication device by detecting the capacitance value of the detection capacitor 121, and the change of the capacitance value of the detection capacitor 121 does not influence the power of the antenna module 110, so that the TRP performance of the antenna is not influenced.
Optionally, fig. 6 is a schematic structural diagram of still another communication device according to an embodiment of the present invention, and referring to fig. 6, the control module 130 includes a BB control unit 131 and a second storage unit 132; the second storage unit 132 is connected to the BB control unit 131, where the second storage unit 132 is configured to store the SAR standard exceeding frequency band value; the BB control unit 131 is connected to the capacitor module 120, and after receiving the first signal, the BB control unit 131 obtains the operating frequency band of the antenna module 110 from the RF detection module 140 and obtains the SAR standard exceeding frequency band value from the second storage unit 132, compares the operating frequency band of the antenna module 110 with the SAR standard exceeding frequency band value, detects whether the operating frequency band of the antenna module 110 includes the SAR standard exceeding frequency band value, and if the operating frequency band of the antenna module 110 includes the SAR standard exceeding frequency band value, sends the SAR lowering instruction to the antenna module 110.
Specifically, BB control unit 131 is connected to first control unit 124. If the current operating frequency band is detected to have the SAR exceeding frequency band value, the BB control unit 131 sends a SAR reducing instruction to the antenna module 110, and if the BB control unit 131 detects that the current operating frequency band has no SAR exceeding frequency band value, the BB control unit 131 does not need to send the SAR reducing instruction to the antenna module 110. The BB control unit 131 needs two conditions for sending the SAR lowering instruction, one is that the capacitance value of the detection capacitor 121 exceeds the standard capacitance value, and the other is that the operating frequency band of the antenna module 110 includes the SAR exceeding frequency band value.
Alternatively, fig. 7 is a schematic structural diagram of still another communication device according to an embodiment of the present invention, and referring to fig. 7, the RF detection module 140 includes an RF detection unit 141 and a second control unit 142; the RF detection unit 141 is connected to the second control unit 142, and the RF detection unit 141 is configured to detect the operating frequency band of the antenna module 110 in real time; the second control unit 142 is connected to the capacitor module 120, and the second control unit 142 is configured to determine whether the operating frequency band detected by the RF detection unit 141 changes, and if it is determined that the operating frequency band of the antenna module 110 changes, send a second signal to the capacitor module 120.
Specifically, the second control unit 142 is connected to the first control unit 124, and when the second control unit 142 determines that the transmission of the operating frequency band of the antenna module 110 changes, a second signal is sent to the first control unit 124. The control module 130 can send the SAR reducing instruction to the antenna module 110 only if the capacitance value of the detection capacitor 121 is greater than the standard capacitance value and the operating frequency band of the antenna module 110 includes an exceeding frequency band value, and if the operating frequency band of the antenna module 110 changes, the capacitance value of the detection capacitor 121 needs to be detected again. Therefore, after the operating frequency band of the antenna module 110 is changed, it is necessary to detect whether the capacitance value of the detection capacitor 121 is greater than the standard capacitance value again. The communication equipment provided by the embodiment can ensure that the communication equipment is in an optimal working state in real time.
Optionally, the first control unit is configured to control the capacitive sensor to detect a capacitance value of the detection capacitor after receiving the second signal.
Specifically, after receiving the second signal, the first control unit controls the capacitive sensor to detect the capacitance value of the detection capacitor, and continuously judges the size between the capacitance value of the detection capacitor and the standard capacitance value, if the capacitance value of the detection capacitor is larger than the standard capacitance value, the first signal is sent to the control module, and after receiving the first signal again, the control module acquires the working frequency band of the antenna module from the RF detection module again and detects whether the working frequency band comprises the SAR exceeding frequency band value.
Optionally, the BB control unit is further configured to send a third signal to the first control unit while sending a SAR reduction instruction to the antenna module; the first control unit is used for controlling the capacitance sensor to detect the capacitance value of the detection capacitor in real time after receiving the third signal, and sending a fourth signal to the detection module if the first control unit detects that the capacitance value of the detection capacitor is within the standard capacitance value range; the detection module is used for sending an SAR reducing relieving instruction to the antenna module after receiving the fourth signal; the antenna module is used for controlling the first tuning switch and the first ground feed point to be switched from the disconnection state to the connection state after receiving the SAR reducing relieving instruction, controlling the second tuning switch and the signal feed point to still be kept in the connection state, controlling the third tuning switch and the second ground feed point to be switched from the connection state to the disconnection state, and controlling the fourth tuning switch and the third ground feed point to be switched from the disconnection state to the connection state so as to restore the default working mode of the antenna module.
Specifically, after the antenna module receives the SAR lowering command, the antenna in the antenna module forms a single feed point annular loop, in the process, if the first control unit detects that the capacitance value of the detection capacitor is in the standard range, the electromagnetic power absorbed by the user is in the standard range, the communication equipment does not need to lower the SAR, at this time, the first control unit sends a fourth signal to the control module, after the control module receives the fourth signal, the control module sends an SAR releasing command to the antenna module, and after the antenna module receives the SAR releasing command, the working state before the antenna module receives the SAR lowering command is restored.
Optionally, the total length of the single-feed point loop is one quarter of a wavelength corresponding to the center frequency of the SAR superscalar band value.
Specifically, after the SAR exceeding frequency band value of the antenna module is measured, the total length of the single-feed point annular loop is required to be set to be one quarter of the wavelength of the center frequency of the SAR exceeding frequency band value according to the transmission characteristic of the antenna, and the antenna can better transmit signals. According to the wavelength formula:
wherein c is the speed of light in the air, f is the center frequency point of the current transmitting frequency band of the antenna, epsilon 2 For the dielectric constant of the metal frame antenna, the total length of the single-frequency point annular loop is equal to one fourth of the wavelength of the center frequency of the SAR superscalar frequency band value, and the position of the current second ground feed point can be determined according to the wavelength, so that fields generated by currents on two sides in the single-frequency point annular loop are mutually offset, and SAR in communication equipment is reduced.
The embodiment of the invention also provides a method for reducing SAR of the communication equipment, which comprises the following steps:
the capacitive module detects whether a user approaches the antenna module, and when the capacitive module detects that the user approaches the antenna module, a first signal is sent to the control module;
the RF detection module detects the working frequency band of the antenna module in real time; after receiving the first signal, the control module acquires the working frequency band of the antenna module from the RF detection module and detects whether the working frequency band comprises an SAR exceeding frequency band value; if the control module detects that the working frequency band comprises an SAR exceeding frequency band value, the control module sends an SAR reducing instruction to the antenna module;
the antenna module comprises an antenna, and after receiving the SAR reducing instruction, the antenna module adjusts a current transmission loop of the antenna into a single-frequency point annular loop.
Optionally, the antenna module further includes a first tuning switch, a second tuning switch, a third tuning switch, a fourth tuning switch, a first ground feed point, a second ground feed point, a third ground feed point, and a signal feed point; the first ground feed point, the second ground feed point, the third ground feed point and the signal feed point are connected with the same side of the antenna, and the second ground feed point and the signal feed point are positioned between the first ground feed point and the third ground feed point; when the second tuning switch is in a connection state with the signal feed point and the third tuning switch is in a connection state with the second ground feed point, the loop from the second tuning switch to the third tuning switch is a single-frequency point annular loop; after receiving the SAR lowering command, the antenna module controls the first tuning switch and the first ground feed point to be switched from a connection state to a disconnection state, controls the second tuning switch and the signal feed point to be connected, controls the third tuning switch and the second ground feed point to be switched from the disconnection state to the connection state, and controls the fourth tuning switch and the third ground feed point to be switched from the connection state to the disconnection state.
Fig. 8 is a flowchart of a method for reducing SAR of a communication device according to an embodiment of the present invention, referring to fig. 8, in the first step, a capacitance sensor and a first control unit detect whether a capacitance value of a detection capacitor is greater than a standard capacitance value, if the capacitance value of the detection capacitor is not greater than the standard capacitance value, the antenna module maintains a default operation mode, otherwise, the second step is entered.
Step two, the control module detects whether the working frequency band of the antenna module comprises an SAR exceeding frequency band value, if not, the antenna module keeps a default working mode, otherwise, the step three is entered.
And step three, the control module sends an SAR reducing instruction to the antenna module.
And step four, after the antenna module receives the SAR lowering instruction, controlling the antenna to form a single-frequency point annular loop.
When the antenna module works in the default working mode, if the BB detection module detects that the working frequency band of the antenna module is changed, the capacitance sensor and the first control unit detect whether the capacitance value of the detection capacitor is larger than the standard capacitance value. When the antenna module receives the SAR lowering command and the antenna forms a single-frequency point annular loop, the antenna module keeps a default working mode when the capacitance value of the capacitance sensor and the first control unit detect that the capacitance value of the detection capacitor is not larger than the standard capacitance value.
The method for reducing SAR of the communication device provided in this embodiment belongs to the same inventive concept as the communication device provided in any embodiment of the present invention, and has corresponding beneficial effects, and technical details not detailed in this embodiment are not detailed in the present embodiment.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the embodiments of the present invention are not limited to the particular embodiments described herein, but are capable of numerous obvious changes, rearrangements and substitutions without departing from the scope of the embodiments of the present invention. Therefore, while the embodiments of the present invention have been described in connection with the above embodiments, the embodiments of the present invention are not limited to the above embodiments, but may include many other equivalent embodiments without departing from the spirit of the embodiments of the present invention, and the scope of the embodiments of the present invention is determined by the scope of the appended claims.
Claims (8)
1. A communication device, comprising an antenna module, a capacitor module, a control module and an RF detection module;
the capacitive module is connected with the antenna module and is used for detecting whether a user approaches the antenna module, and when the user approaches the antenna module, a first signal is sent to the control module;
the RF detection module is connected with the antenna module and is used for detecting the working frequency band of the antenna module in real time;
the control module is connected with the RF detection module, and is used for acquiring the working frequency band of the antenna module from the RF detection module after receiving the first signal, detecting whether the working frequency band comprises an SAR exceeding frequency band value, and sending an SAR reducing instruction to the antenna module if the working frequency band comprises the SAR exceeding frequency band value;
the antenna module comprises an antenna, and is used for adjusting a current transmission loop of the antenna into a single-frequency point annular loop after receiving the SAR lowering instruction;
the antenna module further comprises a first tuning switch, a second tuning switch, a third tuning switch, a fourth tuning switch, a first ground feed point, a second ground feed point, a third ground feed point and a signal feed point; the first ground feed point, the second ground feed point, the third ground feed point and the signal feed point are connected with the same side of the antenna, and the second ground feed point and the signal feed point are positioned between the first ground feed point and the third ground feed point;
when the second tuning switch is in a connection state with the signal feed point and the third tuning switch is in a connection state with the second ground feed point, a loop from the second tuning switch to the third tuning switch is a single-frequency point annular loop;
and the antenna module is used for controlling the first tuning switch and the first ground feed point to be switched from a connection state to a disconnection state after receiving the SAR lowering command, controlling the second tuning switch and the signal feed point to be connected, controlling the third tuning switch and the second ground feed point to be switched from the disconnection state to the connection state, and controlling the fourth tuning switch and the third ground feed point to be switched from the connection state to the disconnection state.
2. The communication device of claim 1, wherein the capacitance module comprises a detection capacitance, a capacitance sensor, a first storage unit, and a first control unit;
the capacitive sensor is connected with the detection capacitor in parallel, and is used for detecting the capacitance value of the detection capacitor;
the first storage unit is connected with the first control unit and is used for storing a standard capacitance value;
the first control unit is connected with the capacitance sensor, and is used for acquiring the capacitance value of the detection capacitor from the capacitance sensor, acquiring the standard capacitance value from the first storage unit, comparing the capacitance value of the detection capacitor with the standard capacitance value, and sending a first signal to the control module if the capacitance value of the detection capacitor is larger than the standard capacitance value.
3. The communication apparatus according to claim 2, wherein the control module includes a BB control unit and a second storage unit;
the second storage unit is connected with the BB control unit and is used for storing SAR superscalar frequency band values;
the BB control unit is connected with the capacitor module, acquires the working frequency band of the antenna module from the RF detection module and the SAR out-of-standard frequency band value from the second storage unit after receiving the first signal, compares the working frequency band of the antenna module with the SAR out-of-standard frequency band value, detects whether the working frequency band of the antenna module comprises the SAR out-of-standard frequency band value, and sends an SAR lowering instruction to the antenna module if the working frequency band of the antenna module comprises the SAR out-of-standard frequency band value.
4. The communication apparatus according to claim 2, wherein the RF detection module includes an RF detection unit and a second control unit;
the RF detection unit is connected with the second control unit and is used for detecting the working frequency range of the antenna module in real time;
the second control unit is connected with the capacitor module and is used for judging whether the working frequency band detected by the RF detection unit changes or not, and if the working frequency band of the antenna module is judged to change, a second signal is sent to the capacitor module.
5. The apparatus according to claim 4, wherein the first control unit is configured to control the capacitance sensor to detect a capacitance value of the detection capacitance after receiving the second signal.
6. The communication apparatus according to claim 3, wherein the BB control unit is further configured to send a third signal to the first control unit while sending a SAR reduction instruction to the antenna module;
the first control unit is used for controlling the capacitance sensor to detect the capacitance value of the detection capacitor in real time after receiving the third signal, and sending a fourth signal to the control module if the first control unit detects that the capacitance value of the detection capacitor is within the standard capacitance value range;
the control module is used for sending an SAR reducing relieving instruction to the antenna module after receiving the fourth signal;
and the antenna module is used for controlling the first tuning switch and the first ground feed point to be switched from the disconnection state to the connection state after receiving the SAR reducing relieving instruction, controlling the second tuning switch and the signal feed point to still keep the connection state, controlling the third tuning switch and the second ground feed point to be switched from the connection state to the disconnection state, and controlling the fourth tuning switch and the third ground feed point to be switched from the disconnection state to the connection state, so that the default working mode of the antenna module is restored.
7. The communication device of claim 1, wherein a total length of the single-frequency-point loop is one quarter of a wavelength corresponding to a center frequency of the SAR superscalar band value.
8. A method of reducing SAR for a communication device, comprising:
the capacitive module detects whether a user approaches the antenna module, and when the user approaches the antenna module, a first signal is sent to the control module;
the RF detection module detects the working frequency band of the antenna module in real time;
the control module acquires the working frequency band of the antenna module from the RF detection module after receiving the first signal, detects whether the working frequency band comprises an SAR exceeding frequency band value, and sends an SAR reducing instruction to the antenna module if the working frequency band comprises the SAR exceeding frequency band value;
the antenna module comprises an antenna, and after receiving the SAR lowering instruction, the antenna module adjusts a current transmission loop of the antenna into a single-frequency point annular loop;
the antenna module further comprises a first tuning switch, a second tuning switch, a third tuning switch, a fourth tuning switch, a first ground feed point, a second ground feed point, a third ground feed point and a signal feed point; the first ground feed point, the second ground feed point, the third ground feed point and the signal feed point are connected with the same side of the antenna, and the second ground feed point and the signal feed point are positioned between the first ground feed point and the third ground feed point;
when the second tuning switch is in a connection state with the signal feed point and the third tuning switch is in a connection state with the second ground feed point, a loop from the second tuning switch to the third tuning switch is a single-frequency point annular loop;
after receiving the SAR lowering command, the antenna module controls the first tuning switch and the first ground feed point to be switched from a connection state to a disconnection state, controls the second tuning switch and the signal feed point to be connected, controls the third tuning switch and the second ground feed point to be switched from the disconnection state to the connection state, and controls the fourth tuning switch and the third ground feed point to be switched from the connection state to the disconnection state.
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| CN102738584B (en) * | 2012-06-15 | 2016-03-02 | 中兴通讯股份有限公司 | A kind of terminal antenna and forming method thereof reducing data card SAR value |
| GB2510318A (en) * | 2012-10-24 | 2014-08-06 | Microsoft Corp | Antenna device with reduced specific absorption rate (SAR) characteristics |
| US9973232B1 (en) * | 2014-06-06 | 2018-05-15 | Amazon Technologies, Inc. | Low specific absorption rate (SAR) dual-band antenna structure |
| CN105897356B (en) * | 2016-03-29 | 2017-12-12 | 乐视控股（北京）有限公司 | Mobile communication terminal and the method and apparatus for optimizing its wireless performance |
| US10461406B2 (en) * | 2017-01-23 | 2019-10-29 | Microsoft Technology Licensing, Llc | Loop antenna with integrated proximity sensing |
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| CN113014288B (en) * | 2021-02-20 | 2023-03-21 | 维沃移动通信有限公司 | Method and device for reducing electromagnetic wave absorption ratio of antenna and electronic equipment |
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