CN104795622A - Antenna device - Google Patents
Antenna device Download PDFInfo
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- CN104795622A CN104795622A CN201410024787.5A CN201410024787A CN104795622A CN 104795622 A CN104795622 A CN 104795622A CN 201410024787 A CN201410024787 A CN 201410024787A CN 104795622 A CN104795622 A CN 104795622A
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- antenna element
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- antenna
- induced signal
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Abstract
The invention relates to an antenna device, which comprises an antenna element, a sensing circuit, a matching circuit and an impedance adjusting circuit, wherein the sensing circuit is used for generating sensing signals; the matching circuit is coupled to the antenna element; the impedance adjusting circuit is coupled to the sensing circuit and enables impedance of the antenna element to be not matched with impedance of the matching circuit through the sensing signals.
Description
Technical field
The invention relates to a kind of wireless telecommunications, particularly relate to a kind of antenna assembly, it can change the impedance matching of antenna element and internal circuit.
Background technology
Wireless communication technique is widely used in all types of electronic installations at present, in order to carry out transfer of data or voice transfer.Generally speaking, electronic installation can utilize specific transmission specification to carry out wireless transmission, such as: IEEE802.11, bluetooth (BlueTooth, BT), Wideband-CDMA (wide band codedivision multiple access, WCDMA) etc.
But, no matter be the wireless transmission specification of which kind of type, all produce a large amount of electromagnetic waves when carrying out transfer of data, causing the actual bodily harm of user.Therefore, there is the electronic installation of wireless communication function at present before actual selling, all must manage by human absorptivity (Specific absorption rate, SAR) test, to lower electromagnetic wave to the issuable danger of user.
Summary of the invention
An object of the present invention is to provide a kind of antenna assembly, and it can be applicable to has in the electronic installation of wireless transmission function, and when this antenna assembly of human body proximity, antenna assembly can reduce its radiation efficiency, reduces the harm to human body.
According to one embodiment of the invention, provide a kind of antenna assembly, it comprises antenna element, sensor circuit, match circuit and impedance adjustment circuit.Sensor circuit is in order to produce induced signal.Match circuit coupling antenna element.Impedance adjustment circuit couples sensor circuit, and by induced signal, the impedance of antenna element is transferred to not mate with the impedance of match circuit.
According to one or more embodiment of the present invention, above-mentioned impedance adjustment circuit coupling antenna element, and the impedance being changed antenna element by induced signal.
According to one or more embodiment of the present invention, above-mentioned impedance adjustment circuit couples match circuit, and is increased by induced signal or reducing antenna element sees impedance into match circuit.
In sum, in one or more embodiment of the present invention, because impedance adjustment circuit can change the impedance of antenna element according to induced signal or change the impedance of match circuit, so the emittance of antenna element can be reduced, and then make antenna assembly can meet the specification of human absorptivity.
Accompanying drawing explanation
For allowing the present invention and advantage thereof become apparent, appended the description of the drawings is with reference to as follows:
Fig. 1 is the circuit block diagram of the antenna assembly illustrating first embodiment of the invention;
Fig. 2 illustrates the antenna element of first embodiment of the invention and the circuit diagram of impedance adjustment circuit;
Fig. 3 illustrates the antenna element of second embodiment of the invention and the circuit diagram of impedance adjustment circuit;
Fig. 4 illustrates the antenna element of third embodiment of the invention and the circuit diagram of impedance adjustment circuit;
Fig. 5 is the circuit block diagram of the antenna assembly illustrating fourth embodiment of the invention;
Fig. 6 is the circuit diagram of the match circuit illustrating fourth embodiment of the invention;
Fig. 7 illustrates the match circuit of fourth embodiment of the invention and the circuit diagram of impedance adjustment circuit;
Fig. 8 illustrates the match circuit of fifth embodiment of the invention and the circuit diagram of impedance adjustment circuit;
Fig. 9 illustrates the match circuit of sixth embodiment of the invention and the circuit diagram of impedance adjustment circuit.
Embodiment
Below will disclose multiple embodiment of the present invention with accompanying drawing, as clearly stated, the details in many practices will be explained in the following description.But should be appreciated that, the details in these practices is not applied to limit the present invention.In addition, accompanying drawing only for the purpose of description, is not mapped according to life size.For making to be convenient to understand, in following explanation, similar elements illustrates with identical symbology.
In this manual, " couple " word and comprise direct or indirect electrical connection means.Therefore, if describe first device in specification to be coupled to the second device, then represent this first device and directly can be electrically connected on this second device, or be indirectly connected to this second device by other devices or connection means.
First, following embodiment discloses a kind of antenna assembly, and this kind of antenna assembly has sensing element, can in order to detect the close of human body.And when antenna assembly disclosed by the following embodiment of human body proximity, antenna assembly can reduce its radiation efficiency, to reduce the harm of electromagnetic wave to human body according to the signal of sensing element sensing.
It is worth mentioning that, following embodiment of the present invention changes the impedance of antenna element or changes the impedance of the match circuit be connected with antenna element, reaches the effect reducing antenna radiation efficiency.More specifically, the antenna assembly of following embodiment is when having detected human body proximity, the impedance of antenna element can be made with the impedance of match circuit to transfer the state of " not mating " to, the reflection loss (Return Loss) of antenna element is caused to increase, and then reduce the radiation gain of antenna element, make to apply the test of electronic installation by human absorptivity of this antenna assembly.
It should be noted that, in ideal conditions, the impedance of antenna element is almost identical with the impedance of match circuit, or is reach conjugate impedance match (Conjugate Match).Now, the standing-wave ratio (Voltage Standing Wave Ratio, VSWR) of antenna element, close to 1, does not namely almost have reflection loss.But when product practical application, standing-wave ratio may be the numerical value between 1 to 2.Therefore, so-called between antenna element with impedance circuit in this manual " not mating ", refer to and the standing-wave ratio of antenna element is increased, to improve the reflection loss of antenna element, and then reduce the transmitting power of antenna element.For example, if the standing-wave ratio of antenna element is originally designed to 1.25, then when designed by the standing-wave ratio of antenna element is greater than originally 1.25 time, such as, when being 1.5, the situation of " not mating " can be regarded as.But it is noted that the just citing of above-mentioned numerical value, and be not used to limit category of the present invention.Every by changing the impedance of antenna element or the impedance of match circuit, antenna element " not being mated " with the impedance of match circuit, and then causes the standing-wave ratio of antenna element increase and reduce radiant power, when belonging to category of the present invention, referring to following explanation.
Please refer to Fig. 1, it is the circuit block diagram of the antenna assembly illustrating first embodiment of the invention.In FIG, antenna assembly 10 comprises antenna element 100, sensor circuit 110, match circuit 120 and impedance adjustment circuit 130.Wherein, match circuit 120 coupling antenna element 100.Impedance adjustment circuit 130 couples sensor circuit 110, and impedance adjustment circuit 130 is directly connected in antenna element 100.
Sensor circuit 110 is in order to produce induced signal Si.More specifically, sensor circuit 110 detects whether there is human body proximity antenna assembly 10 by sensing element 140.In the present embodiment, sensing element 140 can be condenser type and closely connects sensor.When human body proximity antenna assembly 10, sensing element 140 can produce inductance capacitance with human body.Sensor circuit 110 can be responded according to the generation of inductance capacitance and export induced signal Si.
When product practical application, sensing element 140 realizes by another antenna element, but not as limit.In addition, in other embodiments of the invention, sensing element 140 is not limited to condenser type and closely connects sensor, and sensing element 140 also can be temperature-sensitive sticker or OPTICAL SENSORS etc.
In the present embodiment, antenna element 100 can have at least one class frequency resonance mode, such as, and global system for mobile communications frequency range (GSM850/900/1800/1900), but not as limit.When product practical application, the visual actual demand of antenna element 100, such as, operational requirements on structural design requirement or working frequency range and use the combination of acyclic type antenna, planar inverted-F antenna (PIFA antenna), inverse-F antenna (IFA antenna), slotted eye pattern antenna or aforementioned different types antenna to realize.
Please continue to refer to Fig. 1, in the present embodiment, the impedance matching of match circuit 120 and antenna element 100.For example, if antenna element 100 has the resistance value of 50 ohm, then the match circuit 120 coupled with antenna element 100 also should have or be similar to the resistance value of 50 ohm, just can make the minimise reflection losses of antenna element 100.In some embodiments, antenna element 100 can have the resistance value of 75 ohm, and match circuit 120 also has 75 ohm or resistance value close to 75 ohm.When product practical application, the large I of this resistance value sees that the demand of system end is changed.
The impedance adjustment circuit 130 of the present embodiment is directly connected on the body of antenna element 100, and impedance adjustment circuit 130 changes the resistance value of antenna element 100 by induced signal Si.Such as change the input impedance of antenna element 100, the impedance of antenna element 100 is transferred to the impedance of match circuit 120 and does not mate, to reduce the emittance of antenna element 100.Thus, when there being human body proximity antenna assembly 10 in environment, because the emittance of antenna element 100 reduces, human absorptivity also and then reduces.
In addition, the antenna assembly 10 of the present embodiment directly changes the impedance of antenna element 100 by impedance adjustment circuit 130, therefore the electronic installation applying this antenna assembly 10 does not need the power output of removing antenna element 100 by the control circuit of complexity, the control circuit of this complexity can be such as the logical circuit, complex programmable logic device (Complex Programmable LogicDevice, CPLD) etc. of main palm procedure operation in electronic installation.Therefore, the electronic installation of application antenna assembly 10, such as panel computer or smart mobile phone etc., do not need the standard in order to meet human absorptivity, and provide corresponding software and hardware to go to change the power output of antenna in addition.
Then, please also refer to Fig. 2 to Fig. 4, wherein Fig. 2 is the antenna element and the impedance adjustment circuit that illustrate first embodiment of the invention, Fig. 3 is the antenna element and the impedance adjustment circuit that illustrate second embodiment of the invention, and Fig. 4 is the antenna element and the impedance adjustment circuit that illustrate third embodiment of the invention.What need first illustrate is, first, second, third embodiment there is provided the method that three kinds change the input impedance value of antenna element 100, wherein the first embodiment to the 3rd embodiment make use of the input impedance that switch 132, variable capacitance 134 and diode 138 optionally change antenna element 100 respectively, such as utilize switch 132 to change the body length of antenna element 100, but the present invention is not limited thereto.In some embodiments, identical concept or element, such as switch 132, variable capacitance 134 and diode 138 etc., can be used for changing the load point of antenna element 100 or earth point, also can reach the function of the input impedance value changing antenna element 100.
Please refer to Fig. 2, antenna element 100 also comprises Part I 101 and Part II 102, and impedance adjustment circuit 130 also comprises switch 132.Switch 132 is arranged between Part I 101 and Part II 102.In the present embodiment, switch 132 optionally disconnects by induced signal Si or connects Part I 101 and Part II 102, so as to changing the length of antenna element 100.
More specifically, the length of the Part I 101 of the antenna element 100 of the present embodiment can be the half of working frequency range wavelength, and now Part I 101 has preferably width and penetrates efficiency.Therefore, if the length of antenna element 100 is greater than the half-wavelength of working frequency range, will the standing-wave ratio of antenna element 100 be increased, cause the radiation efficiency of antenna element 100 to be deteriorated.Therefore, when the impedance adjustment circuit 130 of the present embodiment receives induced signal Si, namely conducting Part I 101 and Part II 102 are to reduce the radiation efficiency of antenna.In other words, the length of antenna element 100 changes by Part I 101 originally the length that Part I 101 adds Part II 102 into, the standing-wave ratio of antenna element 100 increased and changes the input impedance value of antenna element 100, and then causing the impedance of antenna element 100 to transfer to the impedance of match circuit 120 not mate.
Then, please refer to Fig. 3.In a second embodiment, impedance adjustment circuit 130 can comprise variable capacitance 134.Variable capacitance 134 is connected between Part I 101 and Part II 102.In the present embodiment, the capacitance of variable capacitance 134 can adjust according to induced signal Si, to reach the effect changing the input impedance of antenna element 100 body.
More specifically, when impedance adjustment circuit 130 receives induced signal Si, the capacitance of variable capacitance 134 can be improved.In the present embodiment, when the capacitance of variable capacitance 134 improves, the capacitive reactance of variable capacitance 134 can change the overall input impedance making Part I 101 series variable capacitor 134 add Part II 102 and be changed.
Then, please refer to Fig. 4.In the third embodiment, impedance adjustment circuit 130 comprises electric capacity 136 and diode 138.Wherein, electric capacity 136 is connected with diode 138 and is coupled between Part I 101 and Part II 102, and induced signal Si inputs between the anode of electric capacity 136 and diode 138.In the present embodiment, induced signal Si can pass through an inductance 151 and conducts between the anode of electric capacity 136 and diode 138, and the magnitude of voltage that can improve between electric capacity 136 and diode 138 makes diode 138 conducting, make the AC signal of Part I 101 can pass through electric capacity 136 and be coupled to Part II 102, reach the effect changing antenna element 100 body length whereby.
More specifically, in the present embodiment, the end of Part II 102 can connect high frequency obstructing instrument 150, and one end ground connection of high frequency obstructing instrument 150 opposed second part 102, the AC signal conducting to Part II 102 is looked just as open circuit toward high frequency obstructing instrument 150, but not as limit.In other embodiments, the end of Part II 102 can direct ground connection, direct short-circuit when making AC signal be transmitted to Part II 102.When product practical application, high frequency obstructing instrument 150 can realize with another inductance.Thus, when the induced signal Si of the present embodiment inputs between electric capacity 136 and diode 138, the length Part I 101 be equivalent in the first embodiment of antenna element 100 adds the length of Part II 102.Before the induced signal Si of the present embodiment inputs to electric capacity 136 and diode 138, the length of antenna element 100 is equivalent to the length of the Part I 101 in the first embodiment, reaches the effect being equivalent to convert between two kinds of different lengths in the first embodiment whereby.
It should be noted that, the explanation of the first to the 3rd embodiment is mainly to change the input impedance of antenna element 100 body, and so as to making the impedance of the impedance of antenna element 100 and match circuit 120 for not mate, but the present invention should not be limited to this.External except changing the basis of antenna element 100, also can change antenna element 100 and see and impedance into match circuit 120 to the impedance of antenna element 100 is transferred and does not mate, whereby the emittance of reduction antenna element 100 with the impedance of match circuit 120.
Please refer to Fig. 5, it is the circuit block diagram of the antenna assembly illustrating fourth embodiment of the invention.The present embodiment is different from the first embodiment to be, the impedance adjustment circuit 230 matching connection circuit 120 of the antenna assembly 20 of the present embodiment, impedance adjustment circuit 230 is increased or reducing antenna element 100 sees and impedance into match circuit 120 cause the reflection loss of antenna element 100 to increase by induced signal Si.
For example, please refer to the circuit diagram of the match circuit of the fourth embodiment of the invention that Fig. 6 illustrates.Fig. 6 is the match circuit 120 illustrating level Four, and it has four electronic components, but is not limited thereto.In other embodiments of the invention, as long as the resistance value of the resistance value of antenna element 100 and match circuit 120 is close, such as antenna element 100 sees that the impedance into match circuit 120 is 50 ohm or close to 50 ohm, then the visual actual demand of match circuit 120 is designed to three grades of match circuits 120 to zero level.
In the present embodiment, match circuit 120 can be a kind of π type match circuit 120, but not as limit.In other embodiments of the invention, match circuit 120 can be L-type, T-shaped or serial connection L-type etc.The match circuit 120 of the present embodiment can include electric capacity 121 and inductance 122,123 and 124.As shown in Figure 6, the similar π font that puts in order of electric capacity 121 and inductance 122,123 and 124.In other embodiments, electric capacity 121 position of Fig. 6 changes and is placed as inductance by visual actual demand, or is changed the position of inductance 122,123 and 124 and be placed as electric capacity, to obtain preferably impedance matching.
Then, please refer to Fig. 7 to Fig. 9, wherein Fig. 7 illustrates the match circuit of fourth embodiment of the invention and the circuit diagram of impedance adjustment circuit, Fig. 8 illustrates the match circuit of fifth embodiment of the invention and the circuit diagram of impedance adjustment circuit, and Fig. 9 illustrates the match circuit of sixth embodiment of the invention and the circuit diagram of impedance adjustment circuit.What need first illustrate is, four, the 5th and the 6th embodiment impedance adjustment circuit 230 is connected to match circuit 120 near on the inductance 122 of antenna element 100, see resistance value into match circuit 120 optionally to increase or to reduce antenna element 100, but the present invention is not limited thereto.In other embodiments of the invention, impedance adjustment circuit 230 also can be connected on the electronic component of other positions, as electric capacity 121 or inductance 123 and 124.
Please refer to Fig. 7, impedance adjustment circuit 230 can comprise switch 232 and impedor 210, and its breaker in middle 232 optionally can disconnect according to induced signal Si or matching connection circuit 120 and impedor 210.In the present embodiment, impedor 210 realizes by an inductance, but not as limit.In other embodiments, impedor 210 can realize the electronic component that the AC signal generation of high frequency intercepts by electric capacity or other.When match circuit 120 is connected with impedor 210, impedor 210 can produce AC signal and intercept, and the resistance value into match circuit 120 changes to cause antenna element 100 to be seen, and then the emittance of antenna element 100 is reduced.
Then, please refer to Fig. 8, impedance adjustment circuit 230 can comprise variable capacitance 234.Variable capacitance 234 one end couples match circuit 120, and the other end is ground connection then.Impedance adjustment circuit 230 can adjust the capacitance of variable capacitance 234 according to induced signal Si, antenna element is seen, and the resistance value into match circuit 120 changes along with the capacitance of variable capacitance 234, and then cause the reflection loss of antenna element 100 to increase, and reduce the emittance of antenna element 100.
Then, please refer to Fig. 9, impedance adjustment circuit 230 can comprise electric capacity 236 and diode 238.Wherein, electric capacity 236 is connected with diode 238 and induced signal Si inputs between the anode of electric capacity 236 and diode 238.In the present embodiment, induced signal Si can pass through a high frequency obstructing instrument 250 and conducts between the anode of electric capacity 236 and diode 238, and can improve the magnitude of voltage between electric capacity 236 and diode 238.Simultaneously, impedance adjustment circuit 230 can also comprise impedor 210, be connected between electric capacity 236 and match circuit 120, during the voltage that induced signal Si is improved between electric capacity 236 and diode 238, antenna element 100 sees that the resistance value into match circuit 120 changes, and then reduces the emittance of antenna element 100.
In sum, the above-described embodiment disclosed by the present invention, when human body proximity antenna assembly, can produce induced signal.And impedance adjustment circuit can change the impedance of antenna element according to induced signal or change the impedance of match circuit, when making human body proximity antenna assembly, the impedance of antenna element and match circuit transfers unmatched state to, reflection loss is caused to increase, and then reduce the emittance of antenna element, to meet the specification of absorption of human body efficiency.In addition, the electronic installation of application above-described embodiment antenna assembly does not need the power output of removing antenna element by the control circuit of complexity, under the work load not increasing electronic installation, can reduce the transmitting power of antenna element.
Although the present invention discloses as above with execution mode; so itself and be not used to limit the present invention; anyly be familiar with this those skilled in the art; without departing from the spirit and scope of the present invention; when being used for a variety of modifications and variations, the scope that therefore protection scope of the present invention ought define depending on appending claims is as the criterion.
Claims (10)
1. an antenna assembly, is characterized in that, comprises:
One antenna element;
One sensor circuit, in order to produce an induced signal;
One match circuit, couples this antenna element; And
One impedance adjustment circuit, couples this sensor circuit, by this induced signal, the impedance of this antenna element is transferred to the impedance of this match circuit and does not mate.
2. antenna assembly according to claim 1, is characterized in that, this impedance adjustment circuit couples this antenna element, and changes the impedance of this antenna element by this induced signal.
3. antenna assembly according to claim 2, it is characterized in that, this antenna element includes a Part I and a Part II, this impedance adjustment circuit comprises a switch, this switch-linear hybrid between this Part I and this Part II, and optionally disconnects according to this induced signal or connects this Part I and this Part II.
4. antenna assembly according to claim 2, it is characterized in that, this antenna element includes a Part I and a Part II, this impedance adjustment circuit comprises a variable capacitance, this variable capacitance is connected between this Part I and this Part II, and adjusts the capacitance of this variable capacitance according to this induced signal.
5. antenna assembly according to claim 2, it is characterized in that, this antenna element includes a Part I and a Part II, this impedance adjustment circuit comprises an electric capacity and a diode, this electric capacity and this Diode series and be coupled between this Part I and this Part II, and this induced signal inputs between this electric capacity and anode of this diode.
6. antenna assembly according to claim 1, is characterized in that, this impedance adjustment circuit couples this match circuit, and is increased by this induced signal or reduce this antenna element and see impedance into this match circuit.
7. antenna assembly according to claim 6, is characterized in that, this impedance adjustment circuit comprises a switch and an impedor, and this switch optionally disconnects according to this induced signal or connects this match circuit and this impedor.
8. antenna assembly according to claim 6, is characterized in that, this impedance adjustment circuit comprises a variable capacitance, and this variable capacitance couples this match circuit, and adjusts the capacitance of this variable capacitance according to this induced signal.
9. antenna assembly according to claim 6, is characterized in that, this impedance adjustment circuit comprises an electric capacity and a diode, and this electric capacity and this Diode series and this induced signal input between this electric capacity and anode of this diode.
10. antenna assembly according to claim 1, is characterized in that, whether this sensor circuit has this antenna assembly of human body proximity by a sensing element detecting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410024787.5A CN104795622A (en) | 2014-01-20 | 2014-01-20 | Antenna device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410024787.5A CN104795622A (en) | 2014-01-20 | 2014-01-20 | Antenna device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104795622A true CN104795622A (en) | 2015-07-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410024787.5A Pending CN104795622A (en) | 2014-01-20 | 2014-01-20 | Antenna device |
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| Country | Link |
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| CN (1) | CN104795622A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113675586A (en) * | 2020-05-13 | 2021-11-19 | 启碁科技股份有限公司 | Electronic device |
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| CN102611787A (en) * | 2011-01-19 | 2012-07-25 | 宏碁股份有限公司 | Electronic device and method for controlling wireless communication module |
| CN102891696A (en) * | 2011-07-20 | 2013-01-23 | 启碁科技股份有限公司 | Radio frequency processing device, radio frequency processing method and mobile communication device |
| CN103326684A (en) * | 2012-02-10 | 2013-09-25 | 英飞凌科技股份有限公司 | Adjustable impedance matching network |
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2014
- 2014-01-20 CN CN201410024787.5A patent/CN104795622A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101312354A (en) * | 2008-05-30 | 2008-11-26 | 北京创毅视讯科技有限公司 | Aerial matching circuit and aerial matching method |
| CN101740874A (en) * | 2008-11-11 | 2010-06-16 | 华硕电脑股份有限公司 | Multi-band antenna assembly |
| CN101883413A (en) * | 2010-05-12 | 2010-11-10 | 中兴通讯股份有限公司 | Method, control device and wireless terminal for reducing radiation hazard of wireless terminal |
| CN102611787A (en) * | 2011-01-19 | 2012-07-25 | 宏碁股份有限公司 | Electronic device and method for controlling wireless communication module |
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| CN113675586A (en) * | 2020-05-13 | 2021-11-19 | 启碁科技股份有限公司 | Electronic device |
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Application publication date: 20150722 |