CN202261187U - Radio-frequency tuning circuit of mobile terminal - Google Patents
Radio-frequency tuning circuit of mobile terminal Download PDFInfo
- Publication number
- CN202261187U CN202261187U CN2011203166710U CN201120316671U CN202261187U CN 202261187 U CN202261187 U CN 202261187U CN 2011203166710 U CN2011203166710 U CN 2011203166710U CN 201120316671 U CN201120316671 U CN 201120316671U CN 202261187 U CN202261187 U CN 202261187U
- Authority
- CN
- China
- Prior art keywords
- module
- electric capacity
- antenna
- inductance
- tuning circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
The utility model discloses a radio-frequency tuning circuit of a mobile terminal, comprising: a receiving antenna module used for receiving an electromagnetic wave signal and converting the electromagnetic wave signal into a voltage signal; an antenna matching module used for receiving the voltage signal output by the receiving antenna module and reducing a standing-wave ratio of the antenna and outputting a wideband voltage signal; a filtering module used for filtering a DC (Direct Current) component in the wideband voltage signal output by the antenna matching module; a tuning module used for receiving the wideband signal processed by the filtering module and performing frequency selection; and a fine tuning module used for integrally performing impedance matching for the receiving antenna module, the antenna matching module, the filtering module and the tuning module, and broadening a transmission band of an output signal. The radio-frequency tuning circuit of the utility model enables the mobile terminal having a function of receiving a television signal at a ultrahigh frequency from 400 to 900 MHz to change over from using an external rod antenna to using a small-sized built-in antenna.
Description
Technical field
The utility model relates to a kind of rf tuning circuit of portable terminal, particularly relates to a kind of rf tuning circuit with portable terminal of received television signal function.
Background technology
Along with the development of mobile communication technology, portable terminal is being brought into play more and more important effect in people's live and work.The mobile terminal device that more particularly has the function of televising; For example mobile phone, MP4 (Media Player 4; Media player), PDA (Personal Digital Assistant, personal digital assistant), notebook computer etc., its usage quantity grow with each passing day and volume more and more littler.When these portable terminals dwindled, the miniaturization of reception antenna and built-in problem more and more received researcher's concern, and the key of solution reception antenna miniaturization issues is to design reasonable and practical tuned radio-frequency hardware circuit.For example; Simulated television, CMMB (China Mobile Multimedia Broadcasting; China's DMB), in the multimedia handset of functions such as DTV, DVB-H (Digital Video Broadcasting Handheld, hand-held digital video broadcast) DTV, need use the hyper band electromagnetic wave signal of 400～900MHz; The traditional antenna design is the telescopic antenna of 12～30cm, and volume is big and dumb.Therefore be necessary manufacturing small-sized and practical built-in aerial.But the built-in aerial of miniaturization is relatively poor to electromagnetic receiving ability usually, the performance of the TV signal that can significantly reduce multimedia handset and received.If between the built-in aerial of miniaturization and mobile phone receiving chip, increase by a tunable circuit; Then can improve the performance of antenna greatly, make the TV signal that multimedia handset received to reach the effect identical and solved the problem of antenna miniaturization, built-inization effectively with telescopic antenna.
The utility model content
The technical problem that the utility model will solve is not have the comparatively effectively feasible used antenna miniaturization of 400～900MHz TV signal that receives of rf tuning circuit in the prior art in order to overcome; Promptly can become the defective of small-sized built-in aerial from traditional external telescopic antenna; A kind of rf tuning circuit with TV signal receiving function is provided, makes portable terminal can use the built-in aerial received television signal.
The utility model solves above-mentioned technical problem through following technical proposals:
The utility model provides a kind of rf tuning circuit of portable terminal, is characterized in that the rf tuning circuit of this portable terminal comprises a reception antenna module, is used to receive electromagnetic wave signal and is converted into a voltage signal; One antenna match module is used to receive the voltage signal that the reception antenna module is exported, and reduces antenna standing wave ratio simultaneously, and exports a wideband voltage signal; One filtration module is used for the flip-flop of the wideband voltage signal of filtering antenna match module output; One tuner module, the broadband signal after the resume module that is used to accept filter is also carried out frequency-selecting; One fine setting module is used for carrying out impedance matching to receiving Anneta module, antenna match module, filtration module and tuner module integral body, and makes the passband of output signal obtain broadening; Wherein this reception antenna module, antenna match module, filtration module, tuner module and fine setting module are electrically connected successively.
Preferably, this reception antenna module comprises a reception antenna, and this reception antenna links to each other with an input of said antenna match module.
Preferably; This antenna match module comprises one first electric capacity, one first inductance and one second inductance; One end of this first electric capacity is through the first inductance ground connection; Also be connected with a reception antenna of said reception antenna module, the other end of this first electric capacity is connected with ground through second inductance, also is connected with said filtration module one input.
Preferably, this filtration module comprises one the 3rd inductance and one second electric capacity, and wherein the 3rd inductance is electrically connected with second electric capacity successively.
Preferably; This tuner module comprises one the 5th electric capacity, one the 3rd electric capacity, one the 4th inductance, one first resistance, one second resistance and one first variable capacitance diode; The 4th inductance one end is connected with an end of one second electric capacity of said filtration module; The other end of the 4th inductance is through said first grounding through resistance; One end of this second resistance is connected with the said end of this second electric capacity of said filtration module; The other end of this second resistance is connected with ground through said the 5th electric capacity, and a direct current voltage input end is connected between said second resistance and said the 5th electric capacity, and said first variable capacitance diode has an anode and a negative electrode; The said negative electrode of this first variable capacitance diode is connected with the said end of this second electric capacity of said filtration module, and the said anode of said first variable capacitance diode is through said the 3rd capacity earth.
Preferably; This fine setting module comprises one second variable capacitance diode, one the 4th electric capacity and one the 5th inductance; Wherein this second variable capacitance diode has an anode and a negative electrode, and the said negative electrode of this second variable capacitance diode is connected with an end of one second electric capacity of said filtration module, and the other end of this second electric capacity is connected with an output; One end of said the 5th inductance is connected with said output, and the other end of said the 5th inductance is connected with ground.
The positive progressive effect of the utility model is:
The utility model provides a kind of rf tuning circuit of practicable portable terminal.Through the rf tuning circuit of this portable terminal, the antenna that makes the portable terminal with 400～900MHz hyper band TV signal receiving function becomes small-sized built-in aerial from the external telescopic antenna of traditional design.Thereby the antenna that makes portable terminal is more miniature more simultaneously, greatly improves the video quality that is received.
Description of drawings
Fig. 1 is the rf tuning circuit figure of the portable terminal of the utility model.
Embodiment
Provide the utility model preferred embodiment below in conjunction with accompanying drawing, to specify the technical scheme of the utility model.
The rf tuning circuit figure of portable terminal as shown in Figure 1, the reception antenna module comprising being electrically connected successively is used to receive electromagnetic wave signal and is converted into a voltage signal; One antenna match module is used to receive the voltage signal that the reception antenna module is exported, and reduces antenna standing wave ratio simultaneously, and exports a wideband voltage signal; One filtration module is used for the flip-flop of the wideband voltage signal of filtering antenna match module output; One tuner module, the broadband signal after the resume module that is used to accept filter is also carried out frequency-selecting; One fine setting module is used for carrying out impedance matching to receiving Anneta module, antenna match module, filtration module and tuner module integral body, and makes the passband of output signal obtain broadening;
The reception antenna module 101 of the rf tuning circuit figure of this portable terminal, antenna match module 102, filtration module 103, tuner module 104 and fine setting module 105 specifically describe as follows:
This reception antenna module 101 comprises a reception antenna ANT, and this reception antenna ANT links to each other with an input of said antenna match module.
Preferably, the said reception antenna ANT of this reception antenna module is PIFA antenna or MONOPOLE antenna.
This antenna match module 102 comprises one first capacitor C 1, one first inductance L 1 and one second inductance L 2; One end of this first capacitor C 1 is through first inductance L, 1 ground connection; Also be connected with a reception antenna ANT of said reception antenna module; The other end of this first capacitor C 1 is connected with ground through second inductance L 2, also is connected with said filtration module one input.
This filtration module 103 comprises that this filtration module comprises one the 3rd inductance L 3 and one second capacitor C 2, and wherein the 3rd inductance L 3 is electrically connected with second capacitor C 2 successively.
This tuner module 104 comprises one the 5th capacitor C 5, one the 3rd capacitor C 3, one the 4th inductance L 4, one first resistance R 1, one second resistance R 2 and one first variable capacitance diode D1; The 4th inductance L 4 one ends are connected with an end of one second capacitor C 2 of said filtration module; The other end of the 4th inductance L 4 is through said first resistance R, 1 ground connection; One end of this second resistance R 2 is connected with the said end of said second capacitor C 2 of said filtration module; The other end of this second resistance R 2 is connected with ground through said the 5th capacitor C 5; One direct current voltage input end DC_INPUT is connected between said second resistance R 2 and said the 5th capacitor C 5; The said first variable capacitance diode D1 has an anode and a negative electrode, and the said negative electrode of this first variable capacitance diode D1 is connected with the said end of said second capacitor C 2 of said filtration module, and the said anode of the said first variable capacitance diode D1 is through said the 3rd capacitor C 3 ground connection.
This fine setting module 105 comprises one second variable capacitance diode D2, one the 4th capacitor C 4 and one the 5th inductance L 5; Wherein this second variable capacitance diode D2 has an anode and a negative electrode; The said negative electrode of this second variable capacitance diode D2 is connected with an end of one second capacitor C 2 of said filtration module; The other end of this second capacitor C 2 is connected with an output RF_OUTPUT; One end of said the 5th inductance L 5 is connected with said output RF_OUTPUT, and the other end of said the 5th inductance L 5 is connected with ground.
The rf tuning circuit operation principle of the portable terminal in the present embodiment is following:
When the hyper band radio magnetic wave signal of 400～900MHz of launching towers such as simulated television, CMMB DTV, DVB-H DTV emissions arrived said reception antenna ANT, said reception antenna ANT received the radio magnetic wave signal.Said antenna match module 102 is a π type high pass matching network, is made up of one first capacitor C 1, one first inductance L 1 and one second inductance L 2, is used to reduce antenna standing wave ratio, and adjustment antenna received RF signal is to best.Preferable, the hyper band radio magnetic wave signal of said 400～900MHz can further be divided some frequency ranges, and sets tuning response frequency through the said dc voltage input end DC_INPUT of said tuner module 104.Said the 3rd inductance L 3 of said filtration module 103 is through needing the high-frequency signal of frequency range, and said second capacitor C 2 is used for the stopping direct current signal.The dc voltage input end DC_INPUT of tuner module 104 is used to import VT; End through second resistance R 2 is connected with the negative electrode of the first variable capacitance diode D1, the second variable capacitance diode D2; Under the different reversed bias voltages, the anti-barrier capacitance partially of variable capacitance diode changes thereupon.Along with VT increases, the varactor capacitance value reduces, and the resonance frequency of corresponding LC resonant circuit increases, and realizes that finally 400～900MHz hyper band is tuning.Said bypass the 5th capacitor C 5 is used for the radio-frequency component of the input voltage of the said dc voltage input end DC_INPUT of filtering.Said fine setting module 105 is used to realize impedance matching and regulating circuit spectral bandwidth, and wherein said the 4th capacitor C 4 is a high frequency channel electric capacity, is used for stopping direct current voltage composition simultaneously, and said the 5th inductance L 5 can be adjusted band bandwidth, optimizes the output signal.
Claims (6)
1. the rf tuning circuit of a portable terminal is characterized in that, the rf tuning circuit of this portable terminal comprises:
One reception antenna module is used to receive electromagnetic wave signal and is converted into a voltage signal;
One antenna match module is used to receive the voltage signal that the reception antenna module is exported, and reduces antenna standing wave ratio simultaneously, and exports a wideband voltage signal;
One filtration module is used for the flip-flop of the wideband voltage signal of filtering antenna match module output;
One tuner module, the wideband voltage signal after the resume module that is used to accept filter also carries out frequency-selecting;
One fine setting module is used for this reception antenna module, antenna match module, filtration module and tuner module integral body are carried out impedance matching, and makes the passband of the voltage signal after this tuner module frequency-selecting obtain broadening;
Wherein this reception antenna module, antenna match module, filtration module, tuner module and fine setting module are electrically connected successively.
2. the rf tuning circuit of portable terminal as claimed in claim 1 is characterized in that, this reception antenna module is a reception antenna (ANT), and this reception antenna (ANT) links to each other with an input of said antenna match module.
3. the rf tuning circuit of portable terminal as claimed in claim 1; It is characterized in that; This antenna match module comprises one first electric capacity (C1), one first inductance (L1) and one second inductance (L2); One end of this first electric capacity (C1) is through first inductance (L1) ground connection; One end of this first electric capacity (C1) also is connected with a reception antenna (ANT) of said reception antenna module, and the other end of this first electric capacity (C1) is connected with ground through second inductance (L2), and the other end of this first electric capacity (C1) also is connected with said filtration module one input.
4. the rf tuning circuit of portable terminal as claimed in claim 1 is characterized in that, this filtration module comprises one the 3rd inductance (L3) and one second electric capacity (C2), and wherein the 3rd inductance (L3) is electrically connected with this second electric capacity (C2) successively.
5. the rf tuning circuit of portable terminal as claimed in claim 1; It is characterized in that; This tuner module comprises one the 5th electric capacity (C5), one the 3rd electric capacity (C3), one the 4th inductance (L4), one first resistance (R1), one second resistance (R2) and one first variable capacitance diode (D1); The 4th inductance (L4) end is connected with an end of one second electric capacity (C2) of said filtration module; The other end of the 4th inductance (L4) is through said first resistance (R1) ground connection; One end of this second resistance (R2) is connected with an end of said second electric capacity (C2) of said filtration module; The other end of this second resistance (R2) is connected with ground through said the 5th electric capacity (C5), and a direct current voltage input end (DC_INPUT) is connected between said second resistance (R2) and said the 5th electric capacity (C5), and said first variable capacitance diode (D1) has an anode and a negative electrode; The said negative electrode of this first variable capacitance diode (D1) is connected with an end of said second electric capacity (C2) of said filtration module, and the said anode of said first variable capacitance diode (D1) is through said the 3rd electric capacity (C3) ground connection.
6. the rf tuning circuit of portable terminal as claimed in claim 1; It is characterized in that; This fine setting module comprises one second variable capacitance diode (D2), one the 4th electric capacity (C4) and one the 5th inductance (L5); Wherein this second variable capacitance diode (D2) has an anode and a negative electrode, and the said negative electrode of this second variable capacitance diode (D2) is connected with an end of one second electric capacity (C2) of said filtration module, and the other end of this second electric capacity (C2) is connected with an output (RF_OUTPUT); One end of said the 5th inductance (L5) is connected with said output (RF_OUTPUT), and the other end of said the 5th inductance (L5) is connected with ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203166710U CN202261187U (en) | 2011-08-26 | 2011-08-26 | Radio-frequency tuning circuit of mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203166710U CN202261187U (en) | 2011-08-26 | 2011-08-26 | Radio-frequency tuning circuit of mobile terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202261187U true CN202261187U (en) | 2012-05-30 |
Family
ID=46122368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203166710U Expired - Lifetime CN202261187U (en) | 2011-08-26 | 2011-08-26 | Radio-frequency tuning circuit of mobile terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202261187U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107302346A (en) * | 2017-08-22 | 2017-10-27 | 四川九州电子科技股份有限公司 | The circuit that a kind of solution WiFi is disturbed CATV radio-frequency lines |
| CN109196782A (en) * | 2016-05-20 | 2019-01-11 | 株式会社村田制作所 | Impedance matching circuit, high-frequency front-end circuit and communication device |
| CN114069227A (en) * | 2020-07-29 | 2022-02-18 | 成都鼎桥通信技术有限公司 | Multi-band antenna |
-
2011
- 2011-08-26 CN CN2011203166710U patent/CN202261187U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109196782A (en) * | 2016-05-20 | 2019-01-11 | 株式会社村田制作所 | Impedance matching circuit, high-frequency front-end circuit and communication device |
| CN107302346A (en) * | 2017-08-22 | 2017-10-27 | 四川九州电子科技股份有限公司 | The circuit that a kind of solution WiFi is disturbed CATV radio-frequency lines |
| CN107302346B (en) * | 2017-08-22 | 2021-07-02 | 四川九州电子科技股份有限公司 | Circuit for solving interference of WiFi to CATV radio frequency circuit |
| CN114069227A (en) * | 2020-07-29 | 2022-02-18 | 成都鼎桥通信技术有限公司 | Multi-band antenna |
| CN114069227B (en) * | 2020-07-29 | 2024-02-13 | 成都鼎桥通信技术有限公司 | Multiband antenna |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4292914B2 (en) | Portable receiver and duplexer used therefor | |
| US8126410B2 (en) | Miniature sub-resonant multi-band VHF-UHF antenna | |
| TWI362139B (en) | Digitally controlled antenna tuning circuit for radio frequency receivers | |
| US9002306B2 (en) | Providing multiple inductors for a radio tuner | |
| CN101212230B (en) | Device and method for implementing DVB-H antenna matching network for mobile telephone | |
| US7834814B2 (en) | Antenna arrangement | |
| CN101873382B (en) | Mobile phone, and method and device for dynamically tuning television internal antenna thereof | |
| CN202435391U (en) | Hand-held terminal | |
| CN202261187U (en) | Radio-frequency tuning circuit of mobile terminal | |
| CN209418765U (en) | A kind of tunable multiband aerial | |
| CN104184488A (en) | Radio frequency matching circuit and wireless communication apparatus | |
| CN102957443A (en) | Tuned radio-frequency circuit for mobile terminal | |
| CN202034952U (en) | Ultra short wave full frequency band electrically-tunable filter used for handheld communication machine | |
| JP3904004B2 (en) | Matching device and portable receiver using the same | |
| CN208706849U (en) | A kind of mobile communication terminal antenna that the full frequency band suitable for small headroom covers | |
| CN204391273U (en) | A kind of mobile terminal broad-band antenna adopting tunable capacitor to carry out impedance matching | |
| Huang et al. | Tunable antenna design procedure and harmonics suppression methods of the tunable DVB-H antenna for mobile applications | |
| CN201717941U (en) | Mobile phone and dynamic tuning device of TV built-in antenna thereof | |
| CN203466293U (en) | Antenna assembly | |
| CN101667816A (en) | Electrically tunable filter | |
| CN204517767U (en) | Microwave receiver radio-frequency (RF) front-end circuit electrically tunable filter | |
| CN219980818U (en) | Front-end filter circuit capable of being compatible with DVBT and DVBC simultaneously | |
| JP3972928B2 (en) | Matching device, duplexer using the same, and portable receiver using the same | |
| CN202940779U (en) | Electronic tuner | |
| Lababidi et al. | Tunable semi-lumped dual response filter using active capacitor circuit for multistandard systems |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHANGHAI REMOWIRELESS COMMUNICATION TECHNOLOGY CO. Free format text: FORMER OWNER: XIMUTONG INFORMATION TECHNOLOGY CO., LTD., SHANGHAI Effective date: 20150506 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 200335 CHANGNING, SHANGHAI TO: 201103 MINHANG, SHANGHAI |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20150506 Address after: 201103, 1111, building 11, Hong Yi Building, 2158 Wanyuan Road, Shanghai, Minhang District Patentee after: Shanghai RemoWireless Communication Technology Co., Ltd. Address before: 200335 Shanghai city Changning District Admiralty Road No. 633 Patentee before: Shanghai SIMCom Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120530 |