CN207753712U - Electronic device with FM function - Google Patents
Electronic device with FM function Download PDFInfo
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- CN207753712U CN207753712U CN201820117249.4U CN201820117249U CN207753712U CN 207753712 U CN207753712 U CN 207753712U CN 201820117249 U CN201820117249 U CN 201820117249U CN 207753712 U CN207753712 U CN 207753712U
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Abstract
The utility model discloses a kind of electronic device with FM function, including FM built-in aerials and the first functional circuit, and the FM built-in aerials and the first functional circuit share a coil；The FM built-in aerials include：FM signals amplify the antiresonant circuit of input terminal, antenna-matching circuit, the antiresonant circuit of the first assigned frequency and the second assigned frequency；The both ends of the coil are connected respectively accesses the antiresonant circuit of the first assigned frequency, the antiresonant circuit of series connection the second assigned frequency of access between coil connects antenna-matching circuit, the other end of the antenna-matching circuit connect the FM signals and amplify input terminal；First assigned frequency is in FM signal frequency ranges；Second assigned frequency is in except FM signal frequency ranges, and equal to the working frequency of the first functional circuit.The utility model makes FM built-in aerials obtain good result by matching suitable antiresonant circuit.
Description
Technical field
The utility model is related to arrive radiotechnics, the electronic device with FM function is especially related to.
Background technology
The application of NFC function is more and more in the mobile terminal devices such as mobile phone, tablet at present, wireless using WPC or A4WP
The intelligent terminal quantity of rechargeable standard is also increasing, and FM FM receiver functions almost have become the mark of mobile terminal
Match, but since the wavelength of FM is longer, general FM function of radio receiver is all to serve as FM by the earphone cable of 1 meter of length of slotting ear machine or more
Antenna could be realized, add LNA low noises power amplifier with GSM antenna to realize FM built-in aerial functions on some mobile phones, but effect is not
It is ideal.
Therefore, the prior art could be improved.
Utility model content
The main purpose of the utility model is to provide a kind of electronic device with FM function, it is intended to solve existing FM function
Electronic device the bad technical problem of built-in aerial functional effect.
The utility model proposes a kind of electronic device with FM function, including FM built-in aerials and the first functional circuit,
The FM built-in aerials and the first functional circuit share a coil；
The FM built-in aerials include：FM signals amplification input terminal, antenna-matching circuit, the parallel connection of the first assigned frequency are humorous
The antiresonant circuit for circuit and the second assigned frequency of shaking；
The both ends of the coil are connected respectively accesses the antiresonant circuit of the first assigned frequency, and antenna is connected in coil
The antiresonant circuit of the second assigned frequency is accessed with connecting between circuit, described in the other end connection of the antenna-matching circuit
FM signals amplify input terminal；
First assigned frequency is in FM signal frequency ranges；Second assigned frequency is in FM signal frequency models
Except enclosing, and equal to the working frequency of the first functional circuit.
Preferably, first functional circuit is NFC function circuit；The NFC function circuit includes sequentially connected NFC
Chip circuit, the first matching network circuit and coil；
The antiresonant circuit of two first assigned frequencies is connected respectively accesses the first matching network circuit and coil
Between；It is in parallel between the antiresonant circuit and antenna-matching circuit of second assigned frequency to access the first of a ground connection
The antiresonant circuit of assigned frequency.
Preferably, first assigned frequency is 98MHZ ± 2；Second assigned frequency is 13.56MHZ ± 0.5.
Preferably, the antiresonant circuit of first assigned frequency includes the first inductance and the first capacitance；Described second
The antiresonant circuit of assigned frequency includes the second inductance and the second capacitance.
Preferably, first functional circuit is wireless charging circuit；The wireless charging circuit includes sequentially connected
Wireless charging receiving circuit, the second matching network circuit and coil；
The antiresonant circuit of two first assigned frequencies is connected respectively accesses the second matching network circuit and coil
Between；It is in parallel between the antiresonant circuit and antenna-matching circuit of second assigned frequency to access the first of a ground connection
The antiresonant circuit of assigned frequency.
Preferably, the wireless charging circuit includes A4WP wireless charging circuits.
Preferably, first assigned frequency is 98MHZ ± 2；Second assigned frequency is 6.78MHZ ± 0.5.
Preferably, the antiresonant circuit of first assigned frequency includes third inductance and third capacitance；Described second
The antiresonant circuit of assigned frequency includes the 4th inductance and the 4th capacitance.
Preferably, the wireless charging circuit includes WPC wireless charging circuits；First assigned frequency be 98MHZ ±
2；Second assigned frequency is 96KHZ to 205KHZ.
Preferably, the electronic device with FM function, further includes high pass circuit, the high pass circuit series connection access institute
Between the antiresonant circuit and antenna-matching circuit of stating the second assigned frequency；The high pass circuit includes that capacitance is less than 47PF
Capacitance.
The advantageous effects of the utility model：The utility model is by sharing original NFC work(in mobile terminal device
With or the coil of wireless charging function realize FM built-in aerials function to reduce cost, and pass through and match suitable parallel resonance electricity
Road, which obtains, has the function of the FM built-in aerials of good effect, the NFC function or wireless charging function of the utility model with FM built in
Antenna function is independent of each other, and effect is good.
Description of the drawings
The structural schematic diagram of the electronic device with FM function of one embodiment of Fig. 1 the utility model；
The structural schematic diagram of the electronic device with FM function of another embodiment of Fig. 2 the utility model；
The structural schematic diagram of the electronic device with FM function of Fig. 3 the utility model another embodiment；
The structural schematic diagram of the electronic device with FM function of Fig. 4 another embodiment of the utility model.
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific implementation mode
It should be appreciated that specific embodiment described herein is only used to explain the utility model, it is not used to limit this
Utility model.
Referring to Fig.1, the utility model proposes a kind of electronic devices with FM function, including FM built-in aerials and the first work(
It can circuit, the FM built-in aerials and the shared coil 1 of the first functional circuit；
The FM built-in aerials include：FM signals amplify the parallel connection of input terminal 2, antenna-matching circuit 3, the first assigned frequency
The antiresonant circuit 5 of resonance circuit 4 and the second assigned frequency；
The both ends of the coil 1 are connected respectively accesses the antiresonant circuit 4 of the first assigned frequency, and day is connected in coil 1
The antiresonant circuit 5 of the second assigned frequency of series connection access, the other end of the antenna-matching circuit 3 between lines matching circuit 3
Connect the FM signals amplification input terminal 2；
First assigned frequency is in FM signal frequency ranges；Second assigned frequency is in FM signal frequency models
Except enclosing, and equal to the working frequency of the first functional circuit.
The present embodiment realizes day built in FM by sharing the coil 1 in mobile terminal device in original first functional circuit
Line function obtains the FM built-in aerials with good effect to reduce cost by matching suitable antiresonant circuit,
First functional circuit of the present embodiment is independent of each other with FM built-in aerial functions, and FM effects are good.
With reference to Fig. 2, the electronic device with FM function of another embodiment of the present invention, first functional circuit is NFC
Functional circuit；The NFC function circuit includes sequentially connected NFC chip circuit 6, the first matching network circuit 7 and coil 1；
The antiresonant circuit 4 of two first assigned frequencies is connected respectively accesses the first matching network circuit 7 and line
Between circle 1；One ground connection of access in parallel between the antiresonant circuit 5 and antenna-matching circuit 3 of second assigned frequency
The first assigned frequency antiresonant circuit 4.
The FM built-in aerials of the present embodiment share the coil 1 in NFC circuit with NFC function module, realize the input of FM signals
Function.The present embodiment utilizes parallel connection by going here and there the antiresonant circuit 4 of the first assigned frequency in NFC input signals circuit
Impedance maximum principle when resonance forms bandreject filtering, so that resonant frequency FM signals is obstructed and not pass through, and makes NFC signals suitable
Profit passes through；By going here and there the antiresonant circuit 5 of the second assigned frequency in FM input signals circuit, hindered when using parallel resonance
Resist maximum principle, form bandreject filtering, resonant frequency NFC signals is made to be obstructed and by substantially attenuation by absorption, and FM signals are smooth
Pass through, and by the antiresonant circuit 5 in second assigned frequency and between antenna-matching circuit 3 access in parallel another
The antiresonant circuit 4 of first assigned frequency is simultaneously grounded, and using the maximum principle of impedance when parallel resonance, forms bandpass filtering,
Resonant frequency FM signals are made to pass through, and disresonance NFC signals, by significantly attenuation by absorption, further attenuation by absorption NFC signals carry
The signal-to-noise ratio of high FM signals.
Further, first assigned frequency is 98MHZ ± 2；Second assigned frequency is 13.56MHZ ± 0.5.
Further, the first inductance can be 27nH in the antiresonant circuit 4 of first assigned frequency, and the first capacitance can be
100PF；The second inductance can be 470nH in the antiresonant circuit 5 of second assigned frequency, and the second capacitance can be
300PF needs, and the value of inductance and capacitance can also be other combinations, and above-mentioned value is example, be should not be construed as
Restriction to inductance and capacitance value.
The frequency of FM signals can be 87~108MHZ in the present embodiment, and NFC signal frequencies can be 13.56MHZ, to keep away
Exempt from NFC signals to interfere with each other with FM signals, the coil 1 in NFC circuit connects the first matching network circuit 7 of NFC signals
First assigned frequency of connecting respectively between two axis is the antiresonant circuit of 98MHZ or so, and FM signals is made to be filtered away, so as to every
Signal from 87~108MHZ enters NFC chip by attenuation by absorption to prevent FM signals；Similarly the coil 1 in NFC circuit connects
Second assigned frequency of connecting on the circuit of FM function module is the antiresonant circuit of 13.56MHZ or so, and NFC signals is made to be filtered
Wave falls.
With reference to Fig. 3, the FM built-in aerials of yet another embodiment of the invention, first functional circuit is wireless charging circuit；
The wireless charging circuit includes sequentially connected wireless charging receiving circuit 8, the second matching network circuit 9 and coil 1；
The antiresonant circuit 4 of two first assigned frequencies is connected respectively accesses the second matching network circuit 9 and line
Between circle 1；One ground connection of access in parallel between the antiresonant circuit 5 and antenna-matching circuit 3 of second assigned frequency
The first assigned frequency antiresonant circuit 4.
The FM built-in aerials of the present embodiment share the coil 1 in wireless charging circuit with wireless charging function circuit, realize
FM signal input functions.The present embodiment is by going here and there the antiresonant circuit 4 of the first assigned frequency in wireless charging input signal
In circuit, using the maximum principle of impedance when parallel resonance, bandreject filtering is formed, so that resonant frequency FM signals is obstructed and not leads to
It crosses, and wireless charging signal is allowed to pass through；By the way that the string of antiresonant circuit 5 of the second assigned frequency is returned in FM input signals
Lu Zhong forms bandreject filtering using the maximum principle of impedance when parallel resonance, and resonant frequency wireless charging signal is made to be obstructed and quilt
Substantially attenuation by absorption, and FM signals pass through, and by the antiresonant circuit 5 and antenna in second assigned frequency
Parallel connection accesses the antiresonant circuit 4 of another the first assigned frequency and is grounded between match circuit 3, is hindered when using parallel resonance
Resist maximum principle, forms bandpass filtering, resonant frequency FM signals is made to pass through, and non-resonant wireless charging signal is by significantly
Attenuation by absorption, further attenuation by absorption wireless charging signal improve degree of purity, the clarity of FM signals.
Further, the wireless charging circuit includes A4WP wireless charging circuits.First assigned frequency is 98MHZ
±2；Second assigned frequency is 6.78MHZ ± 0.5.Third inductance can in the antiresonant circuit of first assigned frequency
Think that 27nH, third capacitance can be 100PF；The 4th inductance can be in the antiresonant circuit of second assigned frequency
560nH, the 4th capacitance can be 1000PF.
The frequency of FM signals is 87~108MHZ in the present embodiment, and A4WP wireless charging signal frequencies are 6.78MHZ, to keep away
Exempt from A4WP wireless chargings signal to interfere with each other with FM signals, the coil in A4WP wireless charging circuits connects A4WP wireless chargings
The parallel resonance electricity that first assigned frequency of connecting respectively between two axis of the second matching network circuit 9 of signal is 98MHZ or so
Road makes FM signals be filtered away, so that the signal of 87~108MHZ is isolated, enters A4WP wireless chargings to prevent FM signals and is absorbed
Decaying；Similarly the second assigned frequency of connecting is on the circuit of the coil connection FM function module in A4WP wireless charging circuits
The antiresonant circuit of 6.78MHZ or so makes A4WP wireless chargings signal be filtered away.
With reference to Fig. 4, the FM built-in aerials of further embodiment of this invention, the wireless charging circuit includes WPC wireless chargings
Circuit 80；First assigned frequency is 98MHZ ± 2；Second assigned frequency is 96KHZ to 205KHZ.
Further, the electronic device with FM function of the present embodiment further includes high pass circuit 10, in the second specified frequency
High be powered is accessed between the antiresonant circuit 4 of another the first assigned frequency of the connection ground connection of antiresonant circuit 5 of rate
Road 10；The high pass circuit 10 includes the capacitance that capacitance is less than 47PF；In the antiresonant circuit 4 of first assigned frequency
5th inductance can be 27nH, and the 5th capacitance can be 100PF；The 6th in the antiresonant circuit 5 of second assigned frequency
Inductance can be 560nH, and the 6th capacitance can be 1000PF.
In the present embodiment the frequency of FM signals be 87~108MHZ, WPC wireless charging signal frequencies be 96KHZ extremely
205KHZ, to avoid WPC wireless chargings signal from being interfered with each other with FM signals, the coil 1 in WPC wireless charging circuits connects
First assigned frequency of connecting respectively between two axis of the second matching network circuit 9 of WPC wireless charging signals is 98MHZ's or so
Antiresonant circuit makes FM signals be filtered away, so that the signal of 87~108MHZ is isolated, it is wireless to enter WPC to prevent FM signals
Charging is by attenuation by absorption；Similarly coil 1 in WPC wireless charging circuits 80, which connects, connects second on the circuit of FM function module
Assigned frequency is the antiresonant circuit of 6.78MHZ or so, and is filtered by the series connection low-capacitance capacitance of high pass circuit 10
200KHZ following signals makes wireless charging signal farthest by attenuation by absorption, reduce the influence to FM signals.
The above is only the preferred embodiment of the present invention, and it does not limit the scope of the patent of the present invention,
Equivalent structure or equivalent flow shift made by using the description of the utility model and the drawings, is directly or indirectly transported
Used in other related technical areas, it is equally included in the patent within the scope of the utility model.
Claims (10)
1. a kind of electronic device with FM function, which is characterized in that including FM built-in aerials and the first functional circuit, the FM
Built-in aerial and the first functional circuit share a coil；
The FM built-in aerials include：FM signals amplify the parallel resonance electricity of input terminal, antenna-matching circuit, the first assigned frequency
The antiresonant circuit of road and the second assigned frequency；
The both ends of the coil are connected respectively accesses the antiresonant circuit of the first assigned frequency, in coil connection antenna match electricity
The other end of the antiresonant circuit of the second assigned frequency of series connection access between road, the antenna-matching circuit connects the FM letters
Number amplification input terminal；
First assigned frequency is in FM signal frequency ranges；Second assigned frequency be in FM signal frequency ranges it
Outside, and equal to the working frequency of the first functional circuit.
2. the electronic device according to claim 1 with FM function, which is characterized in that first functional circuit is
NFC function circuit；The NFC function circuit includes sequentially connected NFC chip circuit, the first matching network circuit and coil；
The antiresonant circuit of two first assigned frequencies is connected respectively between the first matching network circuit of access and coil；
The first of one ground connection of access in parallel is specified between the antiresonant circuit and antenna-matching circuit of second assigned frequency
The antiresonant circuit of frequency.
3. the electronic device according to claim 2 with FM function, which is characterized in that first assigned frequency is
98MHZ±2；Second assigned frequency is 13.56MHZ ± 0.5.
4. the electronic device according to claim 3 with FM function, which is characterized in that first assigned frequency and
It includes the first inductance and the first capacitance to join resonance circuit；The antiresonant circuit of second assigned frequency include the second inductance and
Second capacitance.
5. the electronic device according to claim 1 with FM function, which is characterized in that first functional circuit is nothing
Line charging circuit；The wireless charging circuit include sequentially connected wireless charging receiving circuit, the second matching network circuit and
Coil；
The antiresonant circuit of two first assigned frequencies is connected respectively between the second matching network circuit of access and coil；
The first of one ground connection of access in parallel is specified between the antiresonant circuit and antenna-matching circuit of second assigned frequency
The antiresonant circuit of frequency.
6. the electronic device according to claim 5 with FM function, which is characterized in that the wireless charging circuit includes
A4WP wireless charging circuits.
7. the electronic device according to claim 6 with FM function, which is characterized in that first assigned frequency is
98MHZ±2；Second assigned frequency is 6.78MHZ ± 0.5.
8. the electronic device according to claim 7 with FM function, which is characterized in that first assigned frequency and
It includes third inductance and third capacitance to join resonance circuit；The antiresonant circuit of second assigned frequency include the 4th inductance and
4th capacitance.
9. the electronic device according to claim 5 with FM function, which is characterized in that the wireless charging circuit includes
WPC wireless charging circuits；First assigned frequency is 98MHZ ± 2；Second assigned frequency is 96KHZ to 205KHZ.
10. the electronic device according to claim 9 with FM function, which is characterized in that further include high pass circuit, it is described
High pass circuit series connection accesses between the antiresonant circuit and antenna-matching circuit of second assigned frequency；The high pass circuit
It is less than the capacitance of 47PF including capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820117249.4U CN207753712U (en) | 2018-01-23 | 2018-01-23 | Electronic device with FM function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820117249.4U CN207753712U (en) | 2018-01-23 | 2018-01-23 | Electronic device with FM function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207753712U true CN207753712U (en) | 2018-08-21 |
Family
ID=63153782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820117249.4U Active CN207753712U (en) | 2018-01-23 | 2018-01-23 | Electronic device with FM function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207753712U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111628792A (en) * | 2020-06-19 | 2020-09-04 | 上海艾为电子技术股份有限公司 | Electronic equipment |
| CN111654299A (en) * | 2020-06-19 | 2020-09-11 | 上海艾为电子技术股份有限公司 | Antenna circuit and electronic equipment |
| CN111741149A (en) * | 2020-06-19 | 2020-10-02 | 上海艾为电子技术股份有限公司 | Electronic equipment |
-
2018
- 2018-01-23 CN CN201820117249.4U patent/CN207753712U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111628792A (en) * | 2020-06-19 | 2020-09-04 | 上海艾为电子技术股份有限公司 | Electronic equipment |
| CN111654299A (en) * | 2020-06-19 | 2020-09-11 | 上海艾为电子技术股份有限公司 | Antenna circuit and electronic equipment |
| CN111741149A (en) * | 2020-06-19 | 2020-10-02 | 上海艾为电子技术股份有限公司 | Electronic equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210909 Address after: 518000 201, No.26, yifenghua Innovation Industrial Park, Xinshi community, Dalang street, Longhua District, Shenzhen City, Guangdong Province Patentee after: Shenzhen waterward Information Co.,Ltd. Address before: 518000, block B, huayuancheng digital building, 1079 Nanhai Avenue, Shekou, Nanshan District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN WATER WORLD Co.,Ltd. |
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| TR01 | Transfer of patent right |