CN113489554A - Communication equipment and method for reducing SAR of communication equipment - Google Patents

Communication equipment and method for reducing SAR of communication equipment Download PDF

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Publication number
CN113489554A
CN113489554A CN202110756318.2A CN202110756318A CN113489554A CN 113489554 A CN113489554 A CN 113489554A CN 202110756318 A CN202110756318 A CN 202110756318A CN 113489554 A CN113489554 A CN 113489554A
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module
feed point
sar
frequency band
antenna module
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CN113489554B (en
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李燕兵
蔡俊杰
王正坤
田晓明
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Jiangsu Seuic Technology Co ltd
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Jiangsu Seuic Technology Co ltd
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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Transceivers (AREA)

Abstract

The embodiment of the invention provides communication equipment and a method for reducing SAR of the communication equipment, wherein the communication equipment comprises an antenna module, a capacitor module, a control module and an RF detection module; the capacitance module is used for detecting whether a user approaches the antenna module, and when the capacitance 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 standard exceeding frequency band value or not, and sending an SAR reducing instruction to the antenna module if the working frequency band comprises the SAR standard exceeding frequency band value; 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 reduction instruction. The embodiment of the invention provides communication equipment and a method for reducing SAR of the communication equipment, which can ensure TRP of a communication module and reduce SAR of the communication equipment.

Description

Communication equipment and method for reducing SAR of communication equipment
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
With the increasing development of science and technology, people have higher requirements on the appearance and performance of communication equipment such as tablet computers, mobile phones and the like, the metal machine body can meet aesthetic requirements of customers on the appearance, the overall structural strength of the whole machine can be improved, and the trend of fashion is more and more trend in the design of the communication equipment such as tablet computers, mobile phones and the like in the industry. In this fashion trend, the design and tuning of the antenna is greatly difficult due to the introduction of the metal frame. In order to achieve better communication performance, most manufacturers only consider how to improve the TRP (Total radiated power) and TIS (Total isotropic sensitivity) performance of the antenna in antenna design, and often neglect the index requirement of SAR (Specific Absorption Rate).
Better antenna performance tends to produce stronger electromagnetic radiation, and when these handheld communication devices are in normal operation, very close to human tissue, an induced electromagnetic field will be produced in the human body. The biological dose specific absorption rate is introduced to characterize the degree of influence of electromagnetic radiation on human body. In order to ensure that the influence of electromagnetic radiation on human body is in a safe range, countries and related organizations in the world set a series of standards for electromagnetic radiation. SAR, defined as the electromagnetic power absorbed or consumed by a unit mass of human tissue per unit time. In practical applications, SAR is a measurement in W/kg. The SAR value indicates how much the heat energy of the mobile communication device will have an influence on the human body, and the larger the value is, the larger the influence on the human body is, otherwise, the smaller the influence is.
Currently, the existing SAR reduction schemes:
1. wave absorbing materials or magnetic sheets and the like are added on the antenna, SAR is reduced through absorption and shielding, and the mode influences the directivity of the antenna and the overall TRP performance.
2. The conducted test power is directly reduced, which directly reduces the antenna TRP performance.
The two schemes can directly influence the performance of the antenna TRP, and for places with large signal interference or weak signals, the communication equipment using the two methods for reducing SAR can directly have the phenomena of call failure, internet access failure and even network drop.
Disclosure of Invention
The embodiment of the invention provides communication equipment and a method for reducing SAR of the communication equipment, which can ensure TRP of a communication module and reduce SAR of the communication equipment.
In a first aspect, an embodiment of the present invention provides a communication device, which includes an antenna module, a capacitance module, a control module, and an RF detection module;
the capacitor module is connected with the antenna module and used for detecting whether a user approaches the antenna module or not, and when the user is detected to approach 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 a 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 (synthetic aperture radar) 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 loop after receiving the SAR reduction command.
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; a first ground feed point, a second ground feed point, a third ground feed point and a 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 and the signal feed point are in a connection state and the third tuning switch and the second feed point are in a connection state, a loop from the second tuning switch to the third tuning switch is a single-frequency point loop;
the antenna module is used for controlling the first tuning switch and the first ground feed point to be switched to a disconnected state from a connected state after receiving the SAR reducing instruction, controlling the second tuning switch to be connected with the signal feed point, controlling the third tuning switch and the second ground feed point to be switched to a connected state from a disconnected state, and controlling the fourth tuning switch and the third ground feed point to be switched to a disconnected state from a connected state.
Optionally, the capacitance module includes a detection capacitor, a capacitance sensor, a first storage unit, and a first control unit;
the capacitance 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 capacitive sensor, and is configured to obtain a capacitance value of the detection capacitor from the capacitive sensor and obtain the standard capacitance value from the first storage unit, compare the capacitance value of the detection capacitor with the standard capacitance value, and send a first signal to the control module if the capacitance value of the detection capacitor is greater 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 the SAR superstandard frequency band value;
the BB control unit is connected with the capacitor module, after receiving the first signal, the BB control unit acquires a working frequency band of the antenna module from the RF detection module and acquires the SAR standard-exceeding frequency band value from the second storage unit, compares the working frequency band of the antenna module with the SAR standard-exceeding frequency band value, detects whether the working frequency band of the antenna module comprises the SAR standard-exceeding frequency band value, and sends an SAR reduction instruction to the antenna module if the working frequency band of the antenna module comprises the SAR standard-exceeding 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 band of the antenna module in real time;
the second control unit is connected with the capacitor module and 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 changes, 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 the SAR reduction instruction to the antenna module;
the first control unit is configured to control the capacitance sensor to detect a capacitance value of the detection capacitor in real time after receiving the third signal, and send 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 removing 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 to a connected state from a disconnected state after receiving the SAR lifting removing instruction, controlling the second tuning switch and the signal feed point to still keep a connected state, controlling the third tuning switch and the second ground feed point to be switched to a disconnected state from a connected state, and controlling the fourth tuning switch and the third ground feed point to be switched to a connected state from a disconnected state, so that the default working mode of the antenna module is recovered.
Optionally, the total length of the single-frequency point loop is one quarter of a wavelength corresponding to a center frequency of the SAR superstandard frequency band value.
In a second aspect, an embodiment of the present invention provides a method for reducing SAR of a communication device, where the method includes:
the method comprises the steps that a capacitance module detects whether a user approaches an antenna module, and when the fact that the user approaches the antenna module is detected, a first signal is sent to a 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 a working frequency band of the antenna module from the RF detection module and detects whether the working frequency band comprises an SAR standard exceeding frequency band value, and if the working frequency band comprises the SAR standard exceeding frequency band value, the control module sends an SAR reducing instruction to the antenna module;
the antenna module comprises an antenna, and after the antenna module receives the SAR reduction instruction, the current transmission loop of the antenna is adjusted to be a single-frequency point 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; a first ground feed point, a second ground feed point, a third ground feed point and a 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 and the signal feed point are in a connection state and the third tuning switch and the second feed point are in a connection state, a loop from the second tuning switch to the third tuning switch is a single-frequency point loop;
after the antenna module receives the SAR reduction instruction, the antenna module controls the first tuning switch and the first ground feed point to be switched to a disconnected state from a connected state, controls the second tuning switch to be connected with the signal feed point, controls the third tuning switch and the second ground feed point to be switched to a connected state from a disconnected state, and controls the fourth tuning switch and the third ground feed point to be switched to a disconnected state from a connected state.
The embodiment of the invention provides communication equipment, whether the communication equipment is close to a user is detected through a capacitance module, a first signal is sent to a control module when the communication equipment is detected to be close to the user, a working frequency band of an antenna module is detected through an RF detection module, whether the working frequency band of the antenna module comprises an SAR (synthetic aperture radar) standard exceeding frequency band value is judged through the control module, when the control module receives the first signal and judges that the current working frequency band of the antenna module comprises the SAR standard exceeding frequency band value, an SAR reducing instruction is sent to the antenna module, after the antenna module receives the SAR reducing instruction, a current transmission loop of an antenna is adjusted to be a single-frequency-point loop, the single-frequency-point loop can ensure TRP (transient response time) of the communication equipment, the single-frequency-point loop can also reduce an electric field, and therefore SAR of the communication equipment is reduced. The embodiment of the invention provides communication equipment, which can ensure 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 diagram of a single frequency point 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 another communication device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another communication device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another communication device according to an embodiment of the present invention;
fig. 8 is a flowchart illustrating a method for reducing SAR of a communication device according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad invention. It should be further noted that, for convenience of description, only some structures, not all structures, relating 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 capacitance module 120, a control module 130, and an RF detection module 140; the capacitor module 120 is connected to the antenna module 110, and the capacitor 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 it is detected 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, after receiving the first signal, acquire 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 exceeding frequency band value, and if it is detected that the working frequency band includes the SAR exceeding frequency band value, send an SAR reduction 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 point loop after receiving the SAR reduction command.
Specifically, as the user is closer to the communication device, the electromagnetic power absorbed by the user will increase. After the antenna in the antenna module 110 is designed, the situation that the SAR exceeds the standard in which frequency bands of the antenna may occur can be detected through an antenna factory or an SAR authentication detection center, and the frequency bands are referred to as SAR exceeding frequency band values. When the control module 130 receives the first signal sent by the capacitance module 120 and detects that the operating frequency band of the antenna module 110 includes the SAR exceeding frequency band value, the control module sends the SAR decreasing instruction 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 point loop, where the single frequency point loop indicates that the frequency range of the electromagnetic wave currently transmitted by the antenna module 110 is in a narrower frequency bandA single frequency point loop also means that the current carrying loop in the antenna is loop-shaped, rather than in a wide frequency range. In most cases, the exceeding of the SAR value is caused by the consistent field intensity direction due to the wiring form of the antenna, 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 point loop antenna, and referring to fig. 2, a current on the single frequency point loop can be regarded as being composed of a plurality of small current elements, and current elements I are respectively taken from two sides of the single frequency point loop1And I2According to the basic theory of short electric dipole field, the fields generated by two current elements are respectively E1And E2With a current element I1And I2The reverse situation is for example when the two current cells are exactly equal and opposite, i.e. I1＝-I2Then current element I1And I2Superimposed field ErIs 0. The size of the electric field determines the size of the SAR value, so that the SAR reduction is realized after the size of the electric field is reduced. The design of the existing communication equipment is the design requirement of multiple frequency bands and wide frequency bands, the antenna routing basically mainly meets the OTA (Over the air) performance, and the compatibility of TRP (total radiated power) and SAR (specific absorption rate) values is difficult to be considered. In this embodiment, the antenna traces in the antenna module 110 form a single frequency point loop, on one hand, the antenna works in a narrow frequency band to enable the communication module to meet the 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, whether the communication device is close to a user is detected through a capacitance module, a first signal is sent to a control module when the communication device is detected to be close to the user, a working frequency band of an antenna module is detected through an RF detection module, whether the working frequency band of the antenna module comprises an SAR standard exceeding frequency band value is judged through the control module, when the control module receives the first signal and judges that the current working frequency band of the antenna module comprises the SAR standard exceeding frequency band value, an SAR reducing instruction is sent to the antenna module, after the antenna module receives the SAR reducing instruction, a current transmission loop of an antenna is adjusted to be a single-frequency-point loop, the TRP of the communication device can be ensured through the single-frequency-point loop, an electric field can be reduced through the single-frequency-point loop, and the SAR of the communication device is reduced. The embodiment provides a communication device, which can ensure TRP of a communication module and reduce SAR of the communication device.
Optionally, 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, 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 connected to the signal feed point B and the third tuning switch SP4T2 is connected to 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, after receiving the SAR reduction command, control the first tuning switch SP4T1 to be switched from the connected state to the disconnected state with the first ground feed point a, control the second tuning switch main to be connected with the signal feed point B, control the third tuning switch SP4T2 to be switched from the disconnected state to the connected state with the second ground feed point C, and control the fourth tuning switch SP4T3 to be switched from the connected state to the disconnected state with the third ground feed point D.
Specifically, before the antenna module 110 receives the SAR reduction command, the first tuning switch SP4T1 is connected to the first ground feed point a, the second tuning switch main is connected to the signal feed point B, the third tuning switch SP4T2 is disconnected from the second ground feed point C, the fourth tuning switch SP4T3 is connected to the third ground feed point D (as shown in fig. 4), and the first current I in the antenna is generatedaThe 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 and the first tuning switch SP4T1 are used for resonance tuning of medium and high frequency points, and the second current I in the antennabFrom the second tuning switch main to the fourth tuning switch SP4T3, the day between the second tuning switch main to the fourth tuning switch SP4T3The line and the fourth tuning switch SP4T3 are used for resonance tuning of a low-frequency band frequency point, such an antenna structure is a default working state of the antenna module 110, an antenna of the antenna module 110 in the default working state is a broadband antenna, and the broadband antenna has an effect of ensuring that all communication bands supported by the communication device provided by this embodiment have good TRP and TIS performances. After the antenna module 110 receives the SAR reduction command, 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 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 antenna recombination is performed between the plurality of tuning switches and the metal frame 111, so that flexibility and variability of antenna forms are realized, and SAR of the communication device is reduced. Taking a single-frequency-point loop antenna as an example, referring to fig. 3, the single-frequency-point 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 the second line segment is parallel to the fourth line segment and belongs to the part of the metal frame 111.
Optionally, fig. 5 is a schematic structural diagram of another communication device according to an embodiment of the present invention, and referring to fig. 5, the capacitance module 120 includes a detection capacitor 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 the standard capacitance value; the first control unit 124 is connected to the capacitance sensor 122, and the first control unit 124 is configured to obtain a capacitance value of the detection capacitor 121 from the capacitance sensor 122 and a 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 to the signal feed point B in the antenna module 110, the detection capacitor 121 is configured to detect an induction area and a distance between a user and a communication device, when the induction area between the user and the communication device increases and the distance decreases, a capacitance value of the detection capacitor 121 increases, the capacitance sensor 122 is configured to detect a 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 a standard capacitance value, when the capacitance value of the detection capacitor 121 is greater than the standard capacitance value, it is indicated that electromagnetic power currently absorbed by the user may exceed a standard, a first signal needs to be sent to the control module 130, when the capacitance value of the detection capacitor 121 is less than or equal to the standard capacitance value, it is indicated that the electromagnetic power currently absorbed by the user meets the standard value, the first control unit 124 does not need to send the first signal to the control module 130, the communication device does not need to reduce SAR. The distance between a user and communication equipment is checked through an induction coil in the conventional communication equipment, because the induction coil is large in area, the cost is high, the layout is limited, whether the induction coil needs to be placed around an antenna for detecting the approach of the user or not, and a certain influence is exerted on the antenna, the cost and the layout space of the communication equipment are reduced by using the detection capacitor 121 in the communication equipment provided by the embodiment, the working performance of the antenna is not influenced, in addition, whether the user approaches the communication equipment or not is judged by detecting the capacitance value of the detection capacitor 121 in the communication module provided by the embodiment, the power of the antenna module 110 is not influenced by the change of the capacitance value of the detection capacitor 121, and therefore the TRP performance of the antenna is not influenced.
Optionally, fig. 6 is a schematic structural diagram of 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, and the second storage unit 132 is configured to store the SAR superscalar 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 exceeding frequency band value from the second storage unit 132, compares the operating frequency band of the antenna module 110 with the SAR exceeding frequency band value, detects whether the operating frequency band of the antenna module 110 includes the SAR exceeding frequency band value, and sends a SAR reduction instruction to the antenna module 110 if it is detected that the operating frequency band of the antenna module 110 includes the SAR exceeding frequency band value.
Specifically, the BB control unit 131 is connected to the first control unit 124. If it is detected that the current operating frequency band has an SAR exceeding frequency band value, the BB control unit 131 sends an SAR reduction 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 an SAR reduction instruction to the antenna module 110. The BB control unit 131 needs two conditions for sending the SAR reduction instruction, one is to detect that the capacitance value of the capacitor 121 exceeds the standard capacitance value, and the other is to detect that the operating frequency band of the antenna module 110 includes the SAR exceeding frequency band value.
Optionally, fig. 7 is a schematic structural diagram of 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 an 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 send a second signal to the capacitor module 120 if it is determined that the operating frequency band of the antenna module 110 changes.
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 frequency band of the antenna module 110 changes, the second control unit will transmit a second signal to the first control unit 124. The control module 130 can send the SAR reduction instruction to the antenna module 110 only when the capacitance value of the detection capacitor 121 is greater than the standard capacitance value and the working frequency band of the antenna module 110 includes an excessive frequency band value, and if the working 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 changes, it is necessary to detect whether the capacitance value of the detection capacitor 121 is larger than the standard capacitance value again. The communication device provided by the embodiment can ensure that the communication device is in the optimal working state in real time.
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.
Specifically, after receiving the second signal, the first control unit controls the capacitance sensor to detect the capacitance value of the detection capacitor, and continues to determine the value 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 control unit sends a first signal 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 includes 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 the 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 if the first control unit detects that the capacitance value of the detection capacitor is within the standard capacitance value range, a fourth signal is sent to the detection module; the detection module is used for sending an SAR releasing 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 to a connected state from a disconnected state after receiving the SAR lifting removing instruction, controlling the second tuning switch and the signal feed point to still keep a connected state, controlling the third tuning switch and the second ground feed point to be switched to the disconnected state from the connected state, and controlling the fourth tuning switch and the third ground feed point to be switched to the connected state from the disconnected state so as to restore the default working mode of the antenna module.
Specifically, after the antenna module receives the SAR reduction instruction, an antenna in the antenna module forms a single-feed-point loop, in the process, if the first control unit detects that the capacitance value of the detection capacitor is within the standard range, it indicates that the electromagnetic power absorbed by the user is within the standard range, the communication device does not need to reduce 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 SAR removal instruction is sent to the antenna module, and after the antenna module receives the SAR removal instruction, the working state before the SAR reduction instruction is received by the antenna module is recovered.
Optionally, the total length of the single-feed-point loop is one quarter of a wavelength corresponding to a center frequency of the SAR superscalar frequency band value.
Specifically, after the SAR exceeding frequency band value of the antenna module is measured, according to the transmission characteristics of the antenna, the total length of the single-feed-point loop needs to be set to be one quarter of the wavelength of the center frequency of the SAR exceeding frequency band value, and the antenna can better transmit signals. According to the wavelength formula:
Figure BDA0003147671040000141
wherein c is the speed of light in the air, f is the central frequency point of the current emission frequency band of the antenna, epsilon2The total length of the single-frequency point loop circuit is equal to one fourth of the wavelength of the center frequency of the exceeding frequency band value of the SAR, and the position of the current second feed point can be determined according to the wavelength, so that fields generated by currents on two side edges in the single-frequency point loop circuit are mutually offset, and the SAR in the communication equipment is reduced.
The embodiment of the invention also provides a method for reducing the 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 the control module receives 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 standard exceeding frequency band value; if the control module detects that the working frequency band comprises an SAR standard exceeding frequency band value, the control module sends an SAR reducing instruction to the antenna module;
the antenna module comprises an antenna, and after the antenna module receives the SAR reduction instruction, the current transmission loop of the antenna is adjusted to be a single-frequency point 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 and the signal feed point are in a connection state and the third tuning switch and the second ground feed point are in a connection state, a loop from the second tuning switch to the third tuning switch is a single-frequency point annular loop; after receiving the SAR reduction instruction, the antenna module controls the first tuning switch and the first ground feed point to be switched to a disconnected state from a connected state, controls the second tuning switch to be connected with the signal feed point, controls the third tuning switch and the second ground feed point to be switched to a connected state from a disconnected state, and controls the fourth tuning switch and the third ground feed point to be switched to a disconnected state from a connected state.
Fig. 8 is a flowchart illustrating a method for reducing SAR of a communication device according to an embodiment of the present invention, referring to fig. 8, in a first step, a capacitive sensor and a first control unit detect whether a capacitance value of a detection capacitor is larger than a standard capacitance value, if the capacitance value of the detection capacitor is not larger than the standard capacitance value, an antenna module keeps a default operating mode, otherwise, the antenna module enters a second step.
And step two, the control module detects whether the working frequency band of the antenna module comprises an SAR standard frequency band value, if not, the antenna module keeps a default working mode, otherwise, the step three is carried out.
And step three, the control module sends an SAR reduction instruction to the antenna module.
And step four, after the antenna module receives the SAR reduction command, controlling the antenna to form a single-frequency point annular loop.
It should be noted that, when the antenna module operates in the default operating mode, if the BB detecting module detects that the operating frequency band of the antenna module transmits a change, the capacitance sensor and the first control unit detect whether the capacitance value of the detection capacitor is greater than the standard capacitance value. After the antenna module receives the SAR reduction instruction, in the process that the antenna forms a single-frequency point annular loop, when the capacitance value of the detection capacitor detected by the capacitance sensor and the first control unit is not larger than the standard capacitance value, the antenna module keeps the default working mode.
The method for reducing the SAR of the communication device provided by this embodiment is the same as the communication device provided by any embodiment of the present invention, and has corresponding beneficial effects.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will appreciate that the embodiments of the present invention are not limited to the specific embodiments described herein, and that various obvious changes, adaptations, and substitutions are possible, without departing from the scope of the embodiments of the present invention. Therefore, although the embodiments of the present invention have been described in more detail through the above embodiments, the embodiments of the present invention are not limited to the above embodiments, and many other equivalent embodiments may be included without departing from the concept 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 (10)

1. A communication device comprising an antenna module, a capacitance module, a control module, and an RF detection module;
the capacitor module is connected with the antenna module and used for detecting whether a user approaches the antenna module or not, and when the user is detected to approach 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 a 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 (synthetic aperture radar) 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 loop after receiving the SAR reduction command.
2. The communications device of claim 1, wherein 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; a first ground feed point, a second ground feed point, a third ground feed point and a 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 and the signal feed point are in a connection state and the third tuning switch and the second feed point are in a connection state, a loop from the second tuning switch to the third tuning switch is a single-frequency point loop;
the antenna module is used for controlling the first tuning switch and the first ground feed point to be switched to a disconnected state from a connected state after receiving the SAR reducing instruction, controlling the second tuning switch to be connected with the signal feed point, controlling the third tuning switch and the second ground feed point to be switched to a connected state from a disconnected state, and controlling the fourth tuning switch and the third ground feed point to be switched to a disconnected state from a connected state.
3. The communication device according to claim 2, wherein the capacitance module includes a detection capacitance, a capacitance sensor, a first storage unit, and a first control unit;
the capacitance 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 capacitive sensor, and is configured to obtain a capacitance value of the detection capacitor from the capacitive sensor and obtain the standard capacitance value from the first storage unit, compare the capacitance value of the detection capacitor with the standard capacitance value, and send a first signal to the control module if the capacitance value of the detection capacitor is greater than the standard capacitance value.
4. The communication apparatus according to claim 3, 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 the SAR superstandard frequency band value;
the BB control unit is connected with the capacitor module, after receiving the first signal, the BB control unit acquires a working frequency band of the antenna module from the RF detection module and acquires the SAR standard-exceeding frequency band value from the second storage unit, compares the working frequency band of the antenna module with the SAR standard-exceeding frequency band value, detects whether the working frequency band of the antenna module comprises the SAR standard-exceeding frequency band value, and sends an SAR reduction instruction to the antenna module if the working frequency band of the antenna module comprises the SAR standard-exceeding frequency band value.
5. The communication device of claim 3, wherein the RF detection module comprises 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 band of the antenna module in real time;
the second control unit is connected with the capacitor module and 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 changes, a second signal is sent to the capacitor module.
6. The communication device according to claim 5, 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.
7. The communication device of claim 4, wherein the BB control unit is further configured to send a third signal to the first control unit while sending a SAR reduction command to the antenna module;
the first control unit is configured to control the capacitance sensor to detect a capacitance value of the detection capacitor in real time after receiving the third signal, and send 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 removing 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 to a connected state from a disconnected state after receiving the SAR lifting removing instruction, controlling the second tuning switch and the signal feed point to still keep a connected state, controlling the third tuning switch and the second ground feed point to be switched to a disconnected state from a connected state, and controlling the fourth tuning switch and the third ground feed point to be switched to a connected state from a disconnected state, so that the default working mode of the antenna module is recovered.
8. The communication device according to claim 1, wherein the total length of the single-frequency loop is one quarter of a wavelength corresponding to a center frequency of the SAR superscalar band value.
9. A method of reducing SAR of a communication device, comprising:
the method comprises the steps that a capacitance module detects whether a user approaches an antenna module, and when the fact that the user approaches the antenna module is detected, a first signal is sent to a 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 a working frequency band of the antenna module from the RF detection module and detects whether the working frequency band comprises an SAR standard exceeding frequency band value, and if the working frequency band comprises the SAR standard exceeding frequency band value, the control module sends an SAR reducing instruction to the antenna module;
the antenna module comprises an antenna, and after the antenna module receives the SAR reduction instruction, the current transmission loop of the antenna is adjusted to be a single-frequency point loop.
10. The method of claim 9, wherein 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; a first ground feed point, a second ground feed point, a third ground feed point and a 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 and the signal feed point are in a connection state and the third tuning switch and the second feed point are in a connection state, a loop from the second tuning switch to the third tuning switch is a single-frequency point loop;
after the antenna module receives the SAR reduction instruction, the antenna module controls the first tuning switch and the first ground feed point to be switched to a disconnected state from a connected state, controls the second tuning switch to be connected with the signal feed point, controls the third tuning switch and the second ground feed point to be switched to a connected state from a disconnected state, and controls the fourth tuning switch and the third ground feed point to be switched to a disconnected state from a connected state.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114221678A (en) * 2022-01-11 2022-03-22 Oppo广东移动通信有限公司 Near field communication chip, wireless communication device, and specific absorption rate detection method

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102738584A (en) * 2012-06-15 2012-10-17 中兴通讯股份有限公司 Terminal antenna for reducing specific absorption rate (SAR) of data card and molding method of terminal antenna
CN104769771A (en) * 2012-10-24 2015-07-08 微软公司 Sar reduction in radio transmitting devices
CN105897356A (en) * 2016-03-29 2016-08-24 乐视控股（北京）有限公司 Mobile communication terminal and method and apparatus for optimizing wireless performance of mobile communication terminal
US9608331B1 (en) * 2011-09-08 2017-03-28 Ethertronics, Inc. SAR reduction architecture and technique for wireless devices
CN106850100A (en) * 2017-03-23 2017-06-13 上海与德科技有限公司 antenna debugging method and device
US9973232B1 (en) * 2014-06-06 2018-05-15 Amazon Technologies, Inc. Low specific absorption rate (SAR) dual-band antenna structure
US20180212313A1 (en) * 2017-01-23 2018-07-26 Microsoft Technology Licensing, Llc Loop antenna with integrated proximity sensing
CN111029748A (en) * 2019-12-27 2020-04-17 惠州Tcl移动通信有限公司 Antenna system and mobile terminal
CN113014288A (en) * 2021-02-20 2021-06-22 维沃移动通信有限公司 Method and device for reducing electromagnetic wave absorption ratio of antenna and electronic equipment

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9608331B1 (en) * 2011-09-08 2017-03-28 Ethertronics, Inc. SAR reduction architecture and technique for wireless devices
CN102738584A (en) * 2012-06-15 2012-10-17 中兴通讯股份有限公司 Terminal antenna for reducing specific absorption rate (SAR) of data card and molding method of terminal antenna
CN104769771A (en) * 2012-10-24 2015-07-08 微软公司 Sar reduction in radio transmitting devices
US9973232B1 (en) * 2014-06-06 2018-05-15 Amazon Technologies, Inc. Low specific absorption rate (SAR) dual-band antenna structure
CN105897356A (en) * 2016-03-29 2016-08-24 乐视控股（北京）有限公司 Mobile communication terminal and method and apparatus for optimizing wireless performance of mobile communication terminal
US20180212313A1 (en) * 2017-01-23 2018-07-26 Microsoft Technology Licensing, Llc Loop antenna with integrated proximity sensing
CN106850100A (en) * 2017-03-23 2017-06-13 上海与德科技有限公司 antenna debugging method and device
CN111029748A (en) * 2019-12-27 2020-04-17 惠州Tcl移动通信有限公司 Antenna system and mobile terminal
CN113014288A (en) * 2021-02-20 2021-06-22 维沃移动通信有限公司 Method and device for reducing electromagnetic wave absorption ratio of antenna and electronic equipment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114221678A (en) * 2022-01-11 2022-03-22 Oppo广东移动通信有限公司 Near field communication chip, wireless communication device, and specific absorption rate detection method
CN114221678B (en) * 2022-01-11 2023-11-21 Oppo广东移动通信有限公司 Near field communication chip, wireless communication device, and specific absorption rate detection method

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