CN103428314A - Method for adjusting radiation direction of mobile terminal, and mobile terminal - Google Patents
Method for adjusting radiation direction of mobile terminal, and mobile terminal Download PDFInfo
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- CN103428314A CN103428314A CN2012101634467A CN201210163446A CN103428314A CN 103428314 A CN103428314 A CN 103428314A CN 2012101634467 A CN2012101634467 A CN 2012101634467A CN 201210163446 A CN201210163446 A CN 201210163446A CN 103428314 A CN103428314 A CN 103428314A
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Abstract
The invention discloses a method for adjusting the radiation direction of a mobile terminal, and a mobile terminal. The mobile terminal comprises a proximity switch, antennas and a control unit, wherein the proximity switch is used for detecting the distance between a human face and the mobile terminal; the antennas are used for emitting and receiving data and comprise a first-state antenna and a second-state antenna, and the electromagnetic wave absorption ratio SAR value tested by the first-sate antenna is smaller than the SAR value tested by the second-state antenna; and the control unit is used for controlling the antennas to select the first-sate antenna for radiation when the proximity switch detects that the human face is approaching the mobile terminal, and controlling the antennas to select the second-sate antenna for radiation when the proximity switch detects that the human face is away from the mobile terminal. By using the mobile terminal provided by the invention, the unfavorable influence that the mobile terminal exerts on a human body, a hearing aid and the like can be reduced by detecting the distance between the human face and the mobile terminal, and under the condition that the radiation performance of the mobile terminal is ensured, the SAR values and HAC values can be reduced and the user experience and radio frequency performance can be improved.
Description
Technical field
The present invention relates to the mobile communication technology field, particularly relate to a kind of method and mobile terminal of adjusting the mobile terminal radiating direction.
Background technology
Along with developing rapidly of mobile communication, people require more and more higher to the radio-frequency radiation of mobile phone terminal, from basic OTA(Over The Air) performance, develop into mobile phone radiation index S AR(Specific Absorption Rate, electro-magnetic wave absorption ratio or specific absorption rate), HAC(Hearing Aid Compatibility, hearing aid compatibility) etc., the design difficulty of mobile phone radio frequency and antenna is also increasing.Should guarantee the mobile phone radiation performance, guarantee that again antenna is as far as possible little on the impact of human body radiation and hearing aids etc.This performance requirement that seems contradiction has brought huge challenge to the design of antenna for mobile phone.Design for mobile phone, the particularly design of radio frequency and antenna, space is more and more less, integrated level is more and more higher, the surrounding environment complexity also becomes increasingly complex, meet many performance index requirements and existing Antenna Design is more and more difficult, at present antenna for mobile phone design main difficulty is the raising of radiance requirement and to human body, the contradiction of the reduction of the radiation effects such as hearing aids, multimode multi-frequency along with mobile phone, the design of antenna is extremely difficult especially, prior art is difficult to guarantee the control of antenna radiation performance and radiation effect simultaneously, this just requires to change thinking and designs antenna for mobile phone, with meet in requisition for.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method and mobile terminal of adjusting the mobile terminal radiating direction, can not take into account the problem of mobile phone radiation performance and mobile phone radiation impact in order to solve antenna for mobile phone in prior art.
For solving the problems of the technologies described above, on the one hand, the invention provides a kind of mobile terminal that contains adaptive antenna, described mobile terminal comprises:
Approach switch, for detection of the distance of people's face and mobile terminal;
Antenna, for emission or reception data, comprise the first state antenna and the second state antenna, and the electro-magnetic wave absorption ratio SAR value of described the first state antenna measurement is less than the SAR value of described the second state antenna measurement;
Control unit, while for when described approach switch, detecting people's face, approaching mobile terminal, control described day described the first state antenna of line options and carry out radiation; When described approach switch detects people's face away from mobile terminal, control described day described the second state antenna of line options and carry out radiation.
Further, when described the second state antenna carries out radiation, described aerial radiation is main lobe direction to the direction of mobile terminal back cover face, and radiation direction mobile terminal screen direction is secondary lobe and back lobe direction.
Further, described antenna selects the first state antenna or the second state antenna to carry out radiation by diverter switch.
Further, described antenna comprises: main antenna and two cover antenna-matching circuits, and a road is the first state matches circuit, and a road is the second state matches circuit, and described main antenna forms described the first state antenna while being connected with described the first state matches circuit; Described main antenna forms described the second state antenna while being connected with described the second state matches circuit.
Further, described antenna comprises: a main antenna, and the reserved cabling be connected with described main antenna by switching device; Described main antenna is described the first state antenna; After being connected with described reserved cabling, described main antenna forms described the second state radiating antenna.
Further, described approach switch is the photoelectric type approach switch.
Further, described approach switch is passive approach switch, vortex type proximity switch, capacitive approach switch, proximity Hall switch, pyroelectricity formula approach switch, Doppler effect approach switch or trigger switch.
On the other hand, the present invention also provides a kind of method of adjusting the mobile terminal radiating direction, and described method comprises:
Detect the distance of people's face and mobile terminal;
When detection people face approaches mobile terminal, control antenna selects the first state antenna to carry out radiation; When detecting people's face away from mobile terminal, control antenna selects the second state antenna to carry out radiation; The electro-magnetic wave absorption ratio SAR value of described the first state antenna measurement is less than the SAR value of described the second state antenna measurement.
Further, when described the second state antenna carries out radiation, the direction of the radiation direction mobile terminal back cover face of described antenna is main lobe direction, and radiation direction mobile terminal screen direction is secondary lobe and back lobe direction.
Further, detect the distance of people's face and mobile terminal by approach switch; Described approach switch is photoelectric type approach switch, passive approach switch, vortex type proximity switch, capacitive approach switch, proximity Hall switch, pyroelectricity formula approach switch or Doppler effect approach switch.
Beneficial effect of the present invention is as follows:
Mobile terminal of the present invention, by detecting the distance of people's face and mobile terminal, switched antenna state, thereby reduce the adverse effect of mobile terminal to human body and hearing aids etc., on the basis that guarantees the mobile terminal radiating performance, reduce SAR, HAC value, improved the user and experienced and radio-frequency performance.
The accompanying drawing explanation
Fig. 1 is the structural representation of a kind of mobile terminal that contains adaptive antenna in the embodiment of the present invention;
Fig. 2 is the configuration diagram of a kind of adaptive antenna mobile phone in the embodiment of the present invention;
Fig. 3 is the configuration diagram of another adaptive antenna mobile phone in the embodiment of the present invention.
Embodiment
Can not take into account the problem of mobile phone radiation performance and mobile phone radiation impact in order to solve the prior art antenna for mobile phone, the invention provides a kind of method and mobile terminal of adjusting the mobile terminal radiating direction, below in conjunction with accompanying drawing and embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, does not limit the present invention.
Mobile terminal in the present embodiment refers to the terminal that comprises antenna, has the data transmit-receive function, can be the terminals such as mobile phone, panel computer.Below, the present embodiment be take mobile phone as example, is elaborated.
The specific embodiment of the invention scheme is, when the user uses mobile phone to be conversed, the approach switch that is positioned at the screen side detects people's face and presses close to mobile phone, detection information is fed back to control chip, control chip, by control bus order mobile phone front end diverter switch, changes the state of antenna, and antenna condition now at the radiance that keeps antenna simultaneously, human body is had to less radial component, and SAR, HAC value are low than front antenna condition; When approach switch detects people's face and leaves mobile phone, the approach switch feedback information is to control chip; Perhaps when control chip detects user's on-hook, operate, now control chip is controlled the mobile phone front end diverter switch by control bus, switches back original antenna condition.
The antenna directivity of mentioning in following scheme refers to the performance of the concentrated electromagnetic wave energy of antenna system.As transmitting antenna the time, to transmit direction, concentrate energy, reduce the energy of other directions simultaneously; During as reception antenna, from the incoming wave of receive direction, intercept and capture more energy, and the incoming wave of other directions is reduced to the input energy in the mode of phase cancellation.
As shown in Figure 1, the present invention relates to a kind of mobile terminal that contains adaptive antenna, comprising:
1, two antennas are set on mobile phone, one of them omnidirectional antenna (the second state antenna) is for normal mobile communication, its radiation directivity is omnidirectional, the radiances such as OTA meet testing standard, another one-way radiation antenna (the first state antenna) radiation directivity be take the mobile phone battery cover face as main, the radiance hydrofuls such as OTA foot testing standard, and screen orientation has less secondary lobe and back lobe, this antenna has less radiation to human body and hearing aid apparatus.
2, only has a main antenna on mobile phone, two cover mobile phone antenna match circuit are set, one tunnel the second state matches circuit is supported the antenna normal operation, radiance reaches standard, and other road second a state matches circuit can change the radiance of antenna, by the emittance that reduces working frequency range or the radiation directivity that changes antenna, effectively reduce the amount of radiation to human body or hearing aids.
3, only have a main antenna on mobile phone, reserved one or more snippets reserved cabling on the cabling of antenna, reserved cabling is not interfered with other cablings, and the empty regions that reserved cabling can be on pcb board, directly be not connected with main antenna, by switching device, connects.During control chip (control unit) control switch device, this one or more snippets reserved cabling and former main antenna form new antenna, form a new antenna condition.For normal mobile communication, its radiation directivity is omnidirectional to former main antenna (the second state antenna), and the radiances such as OTA meet testing standard; New antenna (the first state antenna) radiation directivity be take the mobile phone battery cover face as main, the radiance hydrofuls such as OTA foot testing standard, and screen orientation has less secondary lobe and back lobe, this antenna has less radiation to human body and hearing aid apparatus.
Approach switch (proximity switch) 101 refer to a kind of for industrial automation control system the novel switched element realize to detect, to control and to reveal with the overall oncontacting of output element.When switch approaches jobbie, send control signal.Because displacement transducer can be made according to different principles and diverse ways, and different displacement transducers is also different to " perception " method of object, and the approach switch in the present embodiment can be with lower any:
1, passive approach switch
This switch does not need power supply, by the closure state of magnetic force induction control switch.When magnetic or the close switch of irony trigger magnetic field, and the inner magneticaction of switch is controlled closed.Characteristics: do not need power supply, contactless, non-maintaining, environmental protection.
2, vortex type proximity switch
This switch also is inductance approach switch sometimes.It is to utilize conductive body when approaching this and can generate an electromagnetic field approach switch, makes interior of articles produce eddy current.This eddy current reacts to approach switch, and switch internal circuit parameter is changed, and identify thus and have or not conductive body to shift near, and then the on-off of control switch.The object that this approach switch can detect must be electric conductor.
3, capacitive approach switch
The measurement of this switch normally forms a pole plate of capacitor, and another pole plate is the shell of switch.This shell ground connection or be connected with the casing of equipment normally in measuring process.When having object to shift to approach switch, no matter whether it is conductor, due to approaching of it, make always the dielectric constant of electric capacity change, thereby capacitance is changed, make the circuit state be connected with gage outfit also change thereupon, thus just being switched on or switched off of controllable switch.The object that this approach switch detects, be not limited to conductor, the liquid that can insulate or powder etc.
4, proximity Hall switch
Hall element is a kind of magneto sensor.The switch that utilizes Hall element to make, be called Hall switch.When the magnetic object shifts near Hall switch, the Hall element on the switch detection faces changes the switch internal circuit status because producing Hall effect, and near the object that is magnetic identification thus exists, and then the on-off of control switch.The detected object of this approach switch must be magnetic bodies.
5, photoelectric type approach switch
Utilize switch that photoelectric effect makes optoelectronic switch.Luminescent device and photoelectric device are contained in same detection head by certain orientation.When reflective surface (object to be detected) being arranged while approaching, photoelectric device is just exported at signal after receiving reverberation, just can " perception " object proximity be arranged thus.
6, pyroelectricity formula approach switch
The switch that the element changed by the energy sense temperature is made is pyroelectricity formula approach switch.This switch is that pyroelectric electric device is arranged on the detection faces of switch, and when the object proximity different from ambient temperature arranged, the output of pyroelectric electric device just changes, and just can detect object proximity thus.
7, Doppler effect approach switch
When observer or system change to the distance of wave source, the wave frequency be close to can be offset, and this phenomenon is called Doppler effect, and sonar and radar utilize the principle of this effect to make.Utilizing the approach switch that Doppler effect is made is the Doppler effect approach switch, such as Ultrasonic Sensor, microwave approach switch etc.When having object to shift near, the reflected signal that approach switch receives can produce Doppler frequency shift, can identify and have or not object proximity thus.
What on the main flow mobile phone, mainly adopt now is the photoelectric type approach switch, and while being mainly used in conversation, the human body state is to close screen, the amount of saving energy.The present invention is the state that approaches that utilizes the approach switch sensing people face on mobile phone, and the state of switched antenna when conversation, to reach the radiation effect reduced human body or hearing aids etc.
Below, with two instantiations, be elaborated:
As shown in Figure 2, as shown in Figure 2, when mobile phone, during at holding state, the antenna for mobile phone state is that mobile phone front end module 205 connects antennas 201 to the framework of adaptive antenna mobile phone, and antenna is omni-directional antenna (the second state antenna), when mobile phone during in talking state, control chip 206 is opened by total line traffic control approach switch 204, and the state of detection people face 207 and mobile phone, when people's face 207 is pressed close to mobile phone, approach switch 204 feeds back to control chip 206, control chip 206 is controlled RF front-end module 205 and antenna 201 by control bus, diverter switch 203 between 202 is connect changes, RF front-end module 205 is connected with antenna 202, antenna condition changes, carry out radiation with the first state antenna, now Antenna gain pattern be take the back cover face as main lobe direction, to the human body direction, lower secondary lobe and back lobe are arranged, effectively reduce the impact on human body and hearing aids etc.The antenna 201,202 here can be two stand-alone antennas, can be also a kind of two states of antenna, and approach switch can be photoelectric type approach switch or other types approach switch.
As shown in Figure 3, as shown in Figure 3, when mobile phone, during at holding state, the antenna for mobile phone state is mobile phone front end module 306 matching connection circuit 303 and antenna 301 to the framework of adaptive antenna mobile phone, and antenna is omni-directional antenna (the second state antenna), when mobile phone during in talking state, control chip 307 is opened by total line traffic control approach switch 308, and the state of detection people face 309 and mobile phone, when people's face 309 is pressed close to mobile phone, approach switch 308 feeds back to control chip 307, control chip 307 is controlled the diverter switch 302 between RF front-end module 306 and antenna 301 by control bus, 305 are connect and are changed, RF front-end module 306 is connected with match circuit 304, antenna condition changes, carry out radiation with the first state antenna, now Antenna gain pattern is for take the back cover face as main lobe direction, to the human body direction, lower graing lobe (secondary lobe) and back lobe are arranged, effectively reduce the impact on human body and hearing aids etc.
In addition, the embodiment of the present invention also relates to a kind of method that realizes adjusting the mobile terminal radiating direction by above-mentioned mobile terminal, comprising:
When talking state, approach switch enters operating state, detect people's face and whether approach mobile phone, if press close to mobile phone, be switched to so new antenna condition (selecting to carry out radiation with the first state antenna), if do not have, still keep original antenna condition (selecting to carry out radiation with the second state antenna); The antenna for mobile phone state is switched to new antenna condition, if now have on-hook operation or approach switch people's face to be detected, leaves, and mobile phone switches back original antenna condition, if both do not have, still keeps new antenna condition.Wherein, the SAR value of the first state antenna measurement is less than the SAR value of described the second state antenna measurement.
Wherein, when the first state antenna carries out radiation, the direction of the radiation direction mobile terminal back cover face of antenna is main lobe direction, to screen orientation, is secondary lobe and back lobe direction.Approach switch is photoelectric type approach switch, passive approach switch, vortex type proximity switch, capacitive approach switch, proximity Hall switch, pyroelectricity formula approach switch, Doppler effect approach switch, or the approach switch of other type, for example trigger switch.
As can be seen from the above-described embodiment, compared with prior art, during the regular handset conversation, the directivity of antenna is still omnidirectional, larger to the radiation effect of human body, hearing aids etc., and during the adaptive antenna mobile phone communication, antenna condition changes, and after radiation direction, shell side is to being main, and graing lobe and secondary lobe are less, radiation effect to human body, hearing aids etc. is less, effectively reduces the indexs such as SAR, HAC of mobile phone.
Although be the example purpose, the preferred embodiments of the present invention are disclosed, it is also possible those skilled in the art will recognize various improvement, increase and replacement, therefore, scope of the present invention should be not limited to above-described embodiment.
Claims (10)
1. a mobile terminal that contains adaptive antenna, is characterized in that, described mobile terminal comprises:
Approach switch, for detection of the distance of people's face and mobile terminal;
Antenna, for emission or reception data, comprise the first state antenna and the second state antenna, and the electro-magnetic wave absorption ratio SAR value of described the first state antenna measurement is less than the SAR value of described the second state antenna measurement;
Control unit, while for when described approach switch, detecting people's face, approaching mobile terminal, control described day described the first state antenna of line options and carry out radiation; When described approach switch detects people's face away from mobile terminal, control described day described the second state antenna of line options and carry out radiation.
2. the mobile terminal that contains adaptive antenna as claimed in claim 1, it is characterized in that, when described the second state antenna carries out radiation, described aerial radiation is main lobe direction to the direction of mobile terminal back cover face, and radiation direction mobile terminal screen direction is secondary lobe and back lobe direction.
3. the mobile terminal that contains adaptive antenna as claimed in claim 2, is characterized in that, described antenna selects the first state antenna or the second state antenna to carry out radiation by diverter switch.
4. the mobile terminal that contains adaptive antenna as claimed in claim 2, it is characterized in that, described antenna comprises: main antenna and two cover antenna-matching circuits, one tunnel is the first state matches circuit, one tunnel is the second state matches circuit, and described main antenna forms described the first state antenna while being connected with described the first state matches circuit; Described main antenna forms described the second state antenna while being connected with described the second state matches circuit.
5. the mobile terminal that contains adaptive antenna as claimed in claim 2, is characterized in that, described antenna comprises: a main antenna, and the reserved cabling be connected with described main antenna by switching device; Described main antenna is described the first state antenna; After being connected with described reserved cabling, described main antenna forms described the second state radiating antenna.
6. the mobile terminal that contains adaptive antenna as described as claim 1 ~ 5 any one, is characterized in that, described approach switch is the photoelectric type approach switch.
7. the mobile terminal that contains adaptive antenna as described as claim 1 ~ 5 any one, it is characterized in that, described approach switch is passive approach switch, vortex type proximity switch, capacitive approach switch, proximity Hall switch, pyroelectricity formula approach switch, Doppler effect approach switch or trigger switch.
8. a method of adjusting the mobile terminal radiating direction, is characterized in that, described method comprises:
Detect the distance of people's face and mobile terminal;
When detection people face approaches mobile terminal, control antenna selects the first state antenna to carry out radiation; When detecting people's face away from mobile terminal, control antenna selects the second state antenna to carry out radiation; The electro-magnetic wave absorption ratio SAR value of described the first state antenna measurement is less than the SAR value of described the second state antenna measurement.
9. the method for adjustment mobile terminal radiating direction as claimed in claim 8, it is characterized in that, when described the second state antenna carries out radiation, the direction of the radiation direction mobile terminal back cover face of described antenna is main lobe direction, and radiation direction mobile terminal screen direction is secondary lobe and back lobe direction.
10. adjust as claimed in claim 8 or 9 the method for mobile terminal radiating direction, it is characterized in that, detect the distance of people's face and mobile terminal by approach switch; Described approach switch is photoelectric type approach switch, passive approach switch, vortex type proximity switch, capacitive approach switch, proximity Hall switch, pyroelectricity formula approach switch or Doppler effect approach switch.
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