CN107707268A - A kind of antenna circuit, radio circuit and terminal that can suppress harmonic wave - Google Patents
A kind of antenna circuit, radio circuit and terminal that can suppress harmonic wave Download PDFInfo
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- CN107707268A CN107707268A CN201711066451.5A CN201711066451A CN107707268A CN 107707268 A CN107707268 A CN 107707268A CN 201711066451 A CN201711066451 A CN 201711066451A CN 107707268 A CN107707268 A CN 107707268A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/0057—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using diplexing or multiplexing filters for selecting the desired band
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/006—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using switches for selecting the desired band
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/401—Circuits for selecting or indicating operating mode
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Transceivers (AREA)
Abstract
The present invention discloses a kind of antenna circuit, radio circuit and terminal that can suppress harmonic wave, the antenna circuit includes antenna, switch, control circuit and filter circuit, the antenna is connected to ground by the switch and filter circuit, and the control circuit connects the switch；The antenna receives the radiofrequency signal of radio-frequency module transmitting, the radiofrequency signal includes main ripple harmonic, the control circuit is controlled by the radio-frequency module to close or disconnect according to the radiofrequency signal control switch, the filter circuit filters out the main ripple of the radiofrequency signal in the switch closure, the harmonic wave of the radiofrequency signal is transmitted to ground, so that the antenna is to main ripple described in external radiation.Antenna circuit, radio circuit and the terminal of the embodiment of the present invention, the radiofrequency signal to needing suppression harmonic wave, harmonic wave is conducted to ground, main ripple is launched from antenna by switch and filter circuit, reaches the purpose for suppressing harmonic wave interference in antenna end.
Description
Technical field
The present invention relates to electronic technology field, more particularly to a kind of antenna circuit that can suppress harmonic wave, radio circuit and
Terminal.
Background technology
With being on the increase for mobile phone frequency range, the frequency to be taken into account of antenna is also more and more, and the design of antenna becomes more next
It is more difficult, cause to low frequency such as GSM850, GSM900 harmonics restraint than more intractable, because being carried out directly from antenna form
Processing is likely to directly affect the performance of LTE Mid Frequencies.
GSM (Global System for Mobile Communication, global system for mobile communications) 850 frequency ranges
Tranmitting frequency is 824-849MHz, and second harmonic 1648-1698MHz, triple-frequency harmonics is 2472-2547MHz；GSM900 frequency ranges
Tranmitting frequency be 880M-915MHz, second harmonic 1760-1830MHz, triple-frequency harmonics is 2640-2745MHz；LTE
(Long Term Evolution, Long Term Evolution) B3 tranmitting frequency is 1710-1785MHz, receives frequency 1805-
1880MHz；LTE B39 frequency is 1880-1920MHz, and B7 tranmitting frequency is 2500-2570MHz, and reception is 2620-
2690MHz, B41 frequency are 2496-2690MHz.It can be seen that the harmonic wave of GSM850 frequency band signals and GSM900 frequency band signals
, if accomplishing to suppress GSM low-frequency harmonics on antenna, it be able to may be influenced whether with the signal cross or close of some LTE frequency ranges
The radiation efficiency of LTE near frequency bands.
Mainly there are two kinds to the method for GSM850, GSM900 harmonics restraint in the prior art, one kind is by low in GSM
Frequency paths connected in series low-pass filter circuit realizes the suppression to its harmonic wave, allows frequency relatively low main ripple by filter circuit, and frequency
The higher harmonic wave of rate is filtered out so as to reach the purpose of suppression harmonic wave；But the low-pass filter circuit connected in circuit can cause
The strength retrogression of main ripple, the loss of signal efficiency being caused, another kind is that harmonic wave is suppressed by the cabling form of antenna, this
Kind of method can cause antenna is very difficult to adjust and may directly affect the use of other frequency ranges, less or do not have suitable for frequency range
Used when influence.
The content of the invention
The embodiment provides a kind of antenna circuit, radio circuit and terminal that can suppress harmonic wave, Neng Gou
Suppress not produce decay to main ripple while harmonic wave interference, and the cabling form of antenna need not be changed.
In a first aspect, the embodiments of the invention provide a kind of antenna circuit that can suppress harmonic wave, this can suppress harmonic wave
Antenna circuit include antenna, switch, control circuit and filter circuit, the antenna passes through the switch and filter circuit and ground
Connection, the control circuit connect the switch；
The antenna receives the radiofrequency signal of radio-frequency module transmitting, and the radiofrequency signal includes main ripple harmonic, described
Control circuit is controlled by the radio-frequency module to close or disconnect, the filtered electrical according to the radiofrequency signal control switch
Road filters out the main ripple of the radiofrequency signal in the switch closure, the harmonic wave of the radiofrequency signal is transmitted into ground, so that institute
State main ripple described in antenna to external radiation.
Second aspect, the embodiment of the present invention additionally provide a kind of radio circuit, and the radio circuit includes above-mentioned antenna circuit
And launch the radio-frequency module of radiofrequency signal to antenna.
The third aspect, the embodiment of the present invention additionally provide a kind of terminal, and the terminal includes above-mentioned radio circuit.
A kind of antenna circuit, radio circuit and terminal that can suppress harmonic wave disclosed in the embodiment of the present invention, only need to be in day
Line end increase switch, control circuit and filter circuit can be achieved with the suppression to harmonic wave, it is not necessary to change the original cabling of antenna
Form；Radiofrequency signal to needing suppression harmonic wave, when antenna receives the radiofrequency signal, control circuit controlling switch closure,
Now filter circuit access antenna, because the frequency of harmonic wave is more than the cut-off frequency of filter circuit, therefore filtered electrical can be passed through
Road is transmitted to ground, and main ripple can not be gone out by filter circuit from aerial radiation, it is achieved that suppressing humorous in antenna end
Purpose of the ripple to other signal interferences；Main ripple is directly gone out by aerial radiation, and other electronics devices are not passed through in centre
Part or circuit, therefore the intensity of main ripple is not compromised by the influence of circuit and produces decay.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, it is required in being described below to embodiment to use
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are some embodiments of the embodiment of the present invention, for this
For the those of ordinary skill of field, on the premise of not paying creative work, it can also be obtained according to these accompanying drawings other
Accompanying drawing.
Fig. 1 is a kind of electrical block diagram of antenna circuit that can suppress harmonic wave provided in an embodiment of the present invention；
Fig. 2 is a kind of electrical block diagram of radio circuit provided in an embodiment of the present invention；
Fig. 3 is a kind of another electrical block diagram of radio circuit provided in an embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is part of the embodiment of the embodiment of the present invention, rather than whole embodiments.Base
Embodiment in the embodiment of the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made
Every other embodiment, belong to the scope of protection of the embodiment of the present invention.
It should be appreciated that ought be in this specification and in the appended claims in use, term " comprising " and "comprising" instruction
The presence of described feature, entirety, element and/or component, but it is not precluded from one or more of the other feature, entirety, element, group
The presence or addition of part and/or its set.
It is also understood that in this embodiment of the present invention term used in the description merely for the sake of description particular implementation
Example purpose and be not intended to limit the embodiment of the present invention.Such as the institute in specification and appended book of the embodiment of the present invention
As use, unless context clearly indicates other situations, otherwise " one " of singulative, "one" and "the" are intended to can
With including plural form.
Fig. 1 is a kind of electrical block diagram of antenna circuit that can suppress harmonic wave provided in an embodiment of the present invention, should
Suppressing the antenna circuit of harmonic wave includes antenna 10, switch 20, control circuit 30 and filter circuit 40, and the antenna 10 is by described
Switch 20 and filter circuit 40 are connected to ground, and the control circuit 30 connects the switch 20, the controlling switch 20 of control circuit 30
Closed and disconnected.
Antenna 10 is a kind of converter, and, the guided wave of transmission above-the-line promotion, it (is typically certainly to be transformed into unbounded medium for it
By space) in the electromagnetic wave propagated, or carry out opposite conversion, one end of antenna 10 connects wired transmission circuit and led to transmit
Traveling wave.
In embodiments of the present invention, antenna 10 receives the radiofrequency signal of radio-frequency module transmitting, and the radiofrequency signal includes
Main ripple harmonic, the control circuit 30 are controlled by the radio-frequency module to be closed according to the radiofrequency signal control switch 20
Close or disconnect, the filter circuit 40 filters out the main ripple of the radiofrequency signal in the closure of switch 20, and the radio frequency is believed
Number harmonic wave be transmitted to ground so that the antenna 10 is to main ripple described in external radiation.
Radio-frequency module can produce such as GSM and LTE network radiofrequency signal, including GSM850, GSM900, GSM1800,
The radiofrequency signal of the frequency bands such as GSM1900, LTE B3, LTE B7, LTE B39 and LTE B41.
The antenna circuit of the embodiment of the present invention suppresses to the harmonic wave of some radiofrequency signals caused by radio-frequency module, prevents
Harmonic wave interference.When being laid out antenna circuit, at the end of antenna 10, increase switchs 20, control circuit 30 and filter circuit 40, when antenna 10
When receiving radiofrequency signal, it is closure or opening that control circuit 30 goes controlling switch 20 according to radiofrequency signal, to needing to carry out
The radiofrequency signal of harmonics restraint, controlling switch 20 close, and otherwise controlling switch 20 disconnects.The cut-off frequency design of filter circuit 40
It is less than the second harmonic of the radiofrequency signal and the frequency of triple-frequency harmonics for the frequency more than main ripple.
After 20 closure is switched, filter circuit 40 accesses antenna 10, because the frequency of harmonic wave is more than cutting for filter circuit 40
Only frequency, therefore harmonic wave can be transmitted to ground by filter circuit 40, and the frequency of main ripple is less than cut-off frequency, can not pass through filter
Wave circuit 40 from antenna 10 so as to radiate, it is achieved that suppressing mesh of the harmonic wave to other signal interferences at the end of antenna 10
's；In addition, main ripple is directly radiate by antenna 10, other electronic devices or circuit are not passed through in centre, therefore
The intensity of main ripple is not compromised by the influence of circuit and produces decay；In addition, the antenna circuit of the embodiment of the present invention is only in antenna
10 ends increase switch 20, control circuit 30 and filter circuit 40, do not change the original cabling form of antenna 10, do not interfere with
Other need not carry out the use of the radio frequency band of harmonics restraint.
Further, the frequency for the correspondence radiofrequency signal that the input of the filter circuit 40 is connected in antenna 10
Resonance point position.
The frequency resonant point position for the correspondence radiofrequency signal that the input of filter circuit 40 is connected in antenna 10,
Then input impedance of the antenna 10 for the filter circuit 40 is minimum, and filter circuit 40 to greatest extent can lead harmonic wave to ground.
Further, the radiofrequency signal of the embodiment of the present invention is the radiofrequency signal of GSM850 or GSM900 frequency ranges.
The frequency range of the main ripples of GSM850 or GSM900 frequency ranges, second harmonic and triple-frequency harmonics is as shown in the table：
| Frequency range | Launch main wave frequency range | Second harmonic frequency scope | Third harmonic frequencies scope |
| GSM850 | 824M-849MHz | 1648M-1698MHz | 2472M-2547MHz |
| GSM900 | 880M-915MHz | 1760M-1830MHz | 2640M-2745MHz |
In embodiments of the present invention, the cut-off frequency of filter circuit 40 is more than or equal to 1GHz, less than or equal to 1.5GHz,
So the main ripple of GSM850 or GSM900 signals can all be filtered out and retain second harmonic and triple-frequency harmonics.
In specific implementation process, the cut-off frequency of filter circuit 40 is preferably 1.5GHz.
Further, the control circuit 30 is used for the emitting power grade when the radiofrequency signal more than or equal to preset
The closure of switch 20 is controlled during power grade.
Control whether to need to the harmonic wave of the radiofrequency signal with the transmission power of radiofrequency signal type and radiofrequency signal
Carry out suppressing that the opportunity for carrying out harmonics restraint can be efficiently controlled.
Further, the output end of the control circuit 30 is connected by GPIO interface with the switch 20, the control
Circuit 30 processed exports high level signal when the emitting power grade of the radiofrequency signal is more than or equal to preset power grade, with
The closure of switch 20 is controlled, low level letter is exported when the emitting power grade of the radiofrequency signal is less than preset power grade
Number, to control the switch 20 to disconnect.Closed and disconnected by low and high level controlling switch 20 is a kind of effective means.
Specifically, if the radiofrequency signal is the signal of GSM850 or GSM900 frequency ranges, the preset power grade is 7.
The radiofrequency signal of GSM850 or GSM900 frequency ranges, its harmonic wave is to other signals when emitting power grade is below 7
Interference is little, therefore it is 7 to set preset power grade.
The residing power grade of mobile terminal work is relevant with the power of presently described communication network signal, when terminal is worked as
When preceding communication network signal is preferable, the residing power grade of mobile terminal work is relatively low, and (level value is bigger, and power grade is got over
It is low), the transmission power of radiofrequency signal is lower.
, it is necessary to suppress the humorous of GSM850/GSM900 frequency band signals exemplified by using the mobile terminal for carrying the antenna circuit
Ripple, and the harmonic wave of GSM1800/GSM1900 frequency ranges or the signal of LTM network bands need not be suppressed, because GSM850/
The main wave frequency rate of the harmonic wave of GSM900 frequency band signals and the signal of LTM network bands overlaps, and harmonic wave is overlapping to there is frequency
Main ripple interference it is bigger, the harmonic frequency of GSM1800/GSM1900 frequency band signals is higher, and those frequency ranges are general not at us
In the use range of communication network, therefore it need not suppress.
The power grade used when present communications network signal is preferable, during mobile terminal call is 8, the transmitting of radiofrequency signal
Power is 27dBm, and now the transmission power of radiofrequency signal is smaller, and the interference effect of its harmonic wave is little, once with network signal
It is deteriorated, the power grade that mobile terminal uses uprises, such as goes to 5 grades, transmission power increase, is changed into 33dBm, now its harmonic wave
Intensity also strengthen, interference to other signals enhancing, then the controlling switch 20 of control circuit 30 closes, and filter circuit 40 starts
Work, to ground, the harmonic wave that can be radiate by antenna 10 is greatly weakened the filtered conduction of circuit 40 of harmonic wave.It is if current logical
Communication network switches to GSM1800/GSM1900, and the controlling switch 20 of control circuit 30 disconnects, and filter circuit 40 disconnects with antenna 10,
Antenna circuit loses the inhibitory action to harmonic wave.
The antenna circuit of the embodiment of the present invention, by the end of antenna 10 increase switch 20, filter circuit 40 and control circuit
30 just can suppress interference of the harmonic wave to other signals, and not produce decay to main ripple, and need not change antenna 10
Cabling form.
Fig. 2 is a kind of electrical block diagram of radio circuit provided in an embodiment of the present invention, and the radio circuit includes day
Line circuit and the radio-frequency module 50 for launching radiofrequency signal to antenna 10.
The antenna circuit includes antenna 10, switch 20, control circuit 30 and filter circuit 40, and the antenna 10 is by described
Switch 20 and filter circuit 40 are connected to ground, and the control circuit 30 connects the switch 20, the controlling switch 20 of control circuit 30
Closed and disconnected.
The radio-frequency module 50 is used for the radio frequency letter that to circuit transmission radiofrequency signal, can produce such as GSM and LTE network
Number, including the frequency band such as GSM850, GSM900, GSM1800, GSM1900, LTE B3, LTE B7, LTE B39 and LTE B41 penetrates
Frequency signal, radiofrequency signal include main ripple harmonic.
Control circuit 30 is controlled by the radio-frequency module 50, when antenna 10 receives the radiofrequency signal of the transmitting of radio-frequency module 50
Afterwards, control circuit 30 is closed or disconnected according to the control switch for radio-frequency signal 20, and the filter circuit 40 is in the switch 20
The main ripple of the radiofrequency signal is filtered out during closure, the harmonic wave of the radiofrequency signal is transmitted to ground, so that the antenna 10 is outside
Radiate the main ripple.
The antenna circuit suppresses to the harmonic wave of some radiofrequency signals caused by radio-frequency module 50, prevents harmonic wave to other
Signal interferes.
The more detailed structure of the antenna circuit refers to the description of above-described embodiment, and the embodiment of the present invention is not done superfluous
State.
Fig. 3 is a kind of another electrical block diagram of radio circuit provided in an embodiment of the present invention, the radio circuit bag
Include antenna circuit and launch the radio-frequency module 50 of radiofrequency signal to antenna 10, the radio-frequency module 50 includes RF receiving and transmission module
501 and front end emission module 502.
RF receiving and transmission module 501 can launch the radiofrequency signal of multiple frequency range, and front end emission module 502 is used to receive radio frequency
The radiofrequency signal that transceiver module 501 is launched, selection and the radio-frequency transmission channels of the frequency band match of the radiofrequency signal, radio-frequency receiving-transmitting
The antenna terminal of module 501 is connected with antenna, and the radiofrequency signal is exported to the antenna 10.
The signal receiving end of front end emission module 502 is connected with the transmitting terminal of the RF receiving and transmission module 501, front end emission
Module 502 has the radio-frequency transmission channels of multiple frequency ranges, and the radiofrequency signal for the different frequency that RF receiving and transmission module 501 is launched passes through
Corresponding radio-frequency transmission channels reach the antenna terminal of front end emission module 502, and last antenna terminal is defeated by the radiofrequency signal
Go out to the antenna 10 and radiate.
The operation principle of RF receiving and transmission module 501 and front end emission module 502 is prior art, and the present embodiment does not do superfluous
State.
The more detailed structure of the antenna circuit refers to the description of first embodiment of the invention, and the embodiment of the present invention is not
Repeat.
The radio circuit of the embodiment of the present invention, by the end of antenna 10 increase switch 20, filter circuit 40 and control circuit
30 just can suppress interference of the harmonic wave to other signals, and not produce decay to main ripple, and need not change antenna 10
Cabling form.
The embodiment of the present invention also provides a kind of terminal, and the terminal includes above-mentioned radio circuit.
The mobile terminal of the embodiment of the present invention, when mobile terminal uses GSM850 and GSM900 frequency ranges, if mobile whole
The communication network signal situation at end is good, and the power grade that mobile terminal uses is relatively low, and power grade is below 7 grades, then mobile whole
The power ratio of the radiofrequency signal of end transmitting is relatively low, and interference of its harmonic wave to other signals is little, and now mobile terminal does not control day
Line circuit suppresses to the harmonic wave of GSM850 and GSM900 frequency band signals, once communication network signal is deteriorated, mobile terminal makes
Power grade uprises, and reaches 7 grades or more than 7 grades, transmission power increase, reaches more than 29dBm, now the intensity of its harmonic wave
Also strengthen, the interference enhancing to other signals, then the filter circuit of mobile terminal control control antenna circuit is started working, humorous
The filtered circuit conduct of ripple can be greatly weakened to ground by the harmonic wave that aerial radiation is gone out.As mobile terminal uses frequency
The switching of section, such as GSM1800/GSM1900 frequency ranges are switched to, the switch 20 of mobile terminal control control antenna circuit disconnects,
Filter circuit disconnects with antenna, the harmonic restraining function of turning-off mobile terminal.
In embodiments of the present invention, the control circuit 30 of antenna circuit can be single circuit, can also pass through movement
The processor of terminal is realized.
Mobile terminal can detect the GSM high-frequency signals of current network when using GSM low frequencies, in detection GSM high frequencies
When signal, controlling switch 20 disconnects, and to avoid normal signal detection, the times that now switch 20 disconnects are extreme, will not
Influence the effect to harmonics restraint.
When mobile terminal can detect other current Low Frequency Network signals when using GSM low frequencies, in this process because
Controlling switch 20 disconnects when mainly based on reception signal, not launching, therefore detecting, and is not turned on suppressing harmonic wave mechanism, similarly,
The time that switch 20 disconnects is extreme, does not interfere with the effect to harmonics restraint.
The terminal of the embodiment of the present invention, it is not necessary to change the cabling form of antenna, it is only necessary to antenna end increase switch 20,
Filter circuit and control circuit 30 realize the suppression of the harmonic wave of the radiofrequency signal to some frequency ranges, avoid harmonic wave to other signals
Interference, while not to main ripple produce decay.
It is described above, the only embodiment of the embodiment of the present invention, but the protection domain of the embodiment of the present invention is not
This is confined to, any one skilled in the art can think easily in the technical scope that the embodiment of the present invention discloses
To various equivalent modifications or substitutions, these modifications or substitutions should all cover within the protection domain of the embodiment of the present invention.Cause
This, the protection domain of the embodiment of the present invention should be defined by scope of the claims.
Claims (10)
- A kind of 1. antenna circuit that can suppress harmonic wave, it is characterised in that including antenna, switch, control circuit and filter circuit, The antenna is connected to ground by the switch and filter circuit, and the control circuit connects the switch；The antenna receives the radiofrequency signal of radio-frequency module transmitting, and the radiofrequency signal includes main ripple harmonic, the control Circuit is controlled by the radio-frequency module to close or disconnect according to the radiofrequency signal control switch, and the filter circuit exists The main ripple of the radiofrequency signal is filtered out during the switch closure, the harmonic wave of the radiofrequency signal is transmitted to ground, so that the day Main ripple described in line to external radiation.
- 2. antenna circuit according to claim 1, it is characterised in that the control circuit is used for when the radiofrequency signal Emitting power grade controls the switch closure when being more than or equal to preset power grade.
- 3. antenna circuit according to claim 2, it is characterised in that the control circuit is specifically used for when the radio frequency is believed Number emitting power grade export high level signal when being more than or equal to preset power grade, to control the switch to close.
- 4. antenna circuit according to claim 2, it is characterised in that the radiofrequency signal is GSM850 frequency ranges or GSM900 The signal of frequency range, the cut-off frequency of the filter circuit is more than or equal to 1GHz, less than or equal to 1.5GHz.
- 5. antenna circuit according to claim 4, it is characterised in that the preset power grade is 7.
- 6. antenna circuit according to claim 1, it is characterised in that the control circuit is opened by GPIO interface with described Connection connects.
- 7. antenna circuit according to claim 1, it is characterised in that the input of the filter circuit is connected in antenna The correspondence radiofrequency signal frequency resonant point position.
- 8. a kind of radio circuit, it is characterised in that sent out including the antenna circuit described in claim any one of 1-7 and to antenna Penetrate the radio-frequency module of radiofrequency signal.
- 9. radio circuit according to claim 8, it is characterised in that the radio-frequency module includes：RF receiving and transmission module, the radiofrequency signal of multiple frequency range can be launched；Front end emission module, it is connected with the transmitting terminal of the RF receiving and transmission module, for selecting the frequency range with the radiofrequency signal The radio-frequency transmission channels of matching, and the radiofrequency signal is exported to the antenna.
- 10. a kind of terminal, it is characterised in that including the radio circuit described in claim 8 or 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711066451.5A CN107707268A (en) | 2017-11-02 | 2017-11-02 | A kind of antenna circuit, radio circuit and terminal that can suppress harmonic wave |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711066451.5A CN107707268A (en) | 2017-11-02 | 2017-11-02 | A kind of antenna circuit, radio circuit and terminal that can suppress harmonic wave |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107707268A true CN107707268A (en) | 2018-02-16 |
Family
ID=61177695
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711066451.5A Withdrawn CN107707268A (en) | 2017-11-02 | 2017-11-02 | A kind of antenna circuit, radio circuit and terminal that can suppress harmonic wave |
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| Country | Link |
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| CN (1) | CN107707268A (en) |
Cited By (5)
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| CN109639313A (en) * | 2018-12-18 | 2019-04-16 | 维沃移动通信有限公司 | A kind of communication control method, system and circuit |
| CN110138411A (en) * | 2019-05-31 | 2019-08-16 | 维沃移动通信有限公司 | Radio circuit, signal processing method, device and terminal |
| CN111407229A (en) * | 2019-01-07 | 2020-07-14 | 四川锦江电子科技有限公司 | Novel electrophysiological filter circuit implementation method |
| CN111864411A (en) * | 2019-04-30 | 2020-10-30 | 北京小米移动软件有限公司 | Antenna module, terminal, control method, control device and storage medium |
| CN113966071A (en) * | 2021-10-22 | 2022-01-21 | 深圳市锐尔觅移动通信有限公司 | Circuit board assembly, electronic device and control method thereof |
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| CN109639313A (en) * | 2018-12-18 | 2019-04-16 | 维沃移动通信有限公司 | A kind of communication control method, system and circuit |
| CN111407229A (en) * | 2019-01-07 | 2020-07-14 | 四川锦江电子科技有限公司 | Novel electrophysiological filter circuit implementation method |
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| EP3734752A1 (en) * | 2019-04-30 | 2020-11-04 | Beijing Xiaomi Mobile Software Co., Ltd. | Antenna module, terminal, control method and device and storage medium |
| US10931319B2 (en) | 2019-04-30 | 2021-02-23 | Beijing Xiaomi Mobile Software Co., Ltd. | Antenna module, terminal, control method and device and storage medium |
| CN111864411B (en) * | 2019-04-30 | 2022-08-05 | 北京小米移动软件有限公司 | Antenna module, terminal, control method, control device and storage medium |
| CN110138411A (en) * | 2019-05-31 | 2019-08-16 | 维沃移动通信有限公司 | Radio circuit, signal processing method, device and terminal |
| CN113966071A (en) * | 2021-10-22 | 2022-01-21 | 深圳市锐尔觅移动通信有限公司 | Circuit board assembly, electronic device and control method thereof |
| WO2023065888A1 (en) * | 2021-10-22 | 2023-04-27 | 深圳市锐尔觅移动通信有限公司 | Circuit board assembly, and electronic device and control method therefor |
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Application publication date: 20180216 |