CN203747049U - Self-tuning cell phone antenna - Google Patents
Self-tuning cell phone antenna Download PDFInfo
- Publication number
- CN203747049U CN203747049U CN201320742847.8U CN201320742847U CN203747049U CN 203747049 U CN203747049 U CN 203747049U CN 201320742847 U CN201320742847 U CN 201320742847U CN 203747049 U CN203747049 U CN 203747049U
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- antenna
- tuning
- impedance matching
- matching circuit
- impedance
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Abstract
The utility model discloses a self-tuning cell phone antenna including an antenna, an impedance matching circuit and a tuning chip. The antenna is connected with one end of the impedance matching circuit electrically through an antenna feed point. The other end of the impedance matching circuit is connected with an input end of the tuning chip electrically. An output terminal of the tuning chip is connected with a radio system electrically through an impedance feed point. According to the utility model, the tuning chip is added in the cell phone antenna. When cell phone frequency changes in a range of 800Mhz to 2600Mhz, the tuning chip tunes the antenna frequency band after detecting frequency changes, such that capacitance value of the impedance matching circuit changes correspondingly and the impedance is maintained around 50 Ohms. Finally, impedance matching of the antenna terminal impedance and the radio system is realized. By the structural improvement, the cell phone antenna is capable of self tuning matching, so that working performance of the antenna is improved and frequency band loss is reduced. Besides, the self-tuning cell phone antenna also has characteristics of being good in antenna signal receiving performance, good in cell phone signal generating performance, high in automation degree and the like.
Description
Technical field
The utility model relates to antenna for mobile phone technical field, relates in particular to a kind of automatic tuning formula antenna for mobile phone.
Background technology
The radiofrequency signal of radio transmitter output is transported on antenna for mobile phone by feeder line, is radiate with electromagnetic wave form by antenna.Electromagnetic wave is got off and is passed through on feeder line radio receiver by connection of antenna after arriving and receiving place.Especially visible, antenna is to transmit and receive an electromagnetic important wireless device, there is no radio communication without antenna.
At present, along with the development of mobile phone ultrathin, many metal partsizations, the radio-frequency (RF) index of antenna mobile phone is difficult to guarantee, and therefore existing mobile phone frequency is in the time that 800Mhz-2600Mhz changes, and match circuit cannot need the impedance of mobile phone to maintain near 50 Europe.And then make mobile phone have the defects such as frequency range loss is large, radio-frequency (RF) index is not up to standard, mobile phone generation signal difference.
Utility model content
For the weak point existing in above-mentioned technology, the utility model provides a kind of simple in structure, frequency range loss is little, aerial signal receptivity is good and mobile phone generation signal is good automatic tuning formula antenna for mobile phone.
For achieving the above object, the utility model provides a kind of automatic tuning formula antenna for mobile phone, comprises antenna, impedance matching circuit and tuning chip; Described antenna is electrically connected with one end of impedance matching circuit by antenna feed point, and the other end of described impedance matching circuit is electrically connected with the input of tuning chip, and the output of described tuning chip is presented a little and is electrically connected with radio system by impedance.
Wherein, the inside of described tuning chip is integrated with DA converting unit and boosting unit; The other end of described impedance matching circuit is electrically connected with the input of boosting unit by DA converting unit, and the output of described boosting unit is electrically connected with impedance feedback point.
Wherein, described impedance matching circuit comprises variable capacitance diode, electric capacity and aerial coil; The positive pole of described variable capacitance diode is electrically connected to respectively one end of antenna feed point and aerial coil, the minus earth of described variable capacitance diode, one end of one end electrical connection aerial coil of described electric capacity, the other end ground connection of described electric capacity, the other end of described aerial coil is electrically connected to DA converting unit.
Wherein, the capacitance of described variable capacitance diode is between 1.2Pf-8.2Pf.
The beneficial effects of the utility model are: compared with prior art, the automatic tuning formula antenna for mobile phone that the utility model provides, in antenna for mobile phone, set up tuning chip, when mobile phone frequency is in the time that 800Mhz-2600Mhz changes, tuning chip detects after frequency change, carry out tuning to this antenna band, make the capacitance in impedance matching circuit change thereupon and impedance is maintained near 50 Europe, finally realize the impedance matching of antenna terminal impedance and radio system, the improvement of this structure can be mated this antenna for mobile phone in automatic tuning, the design of this antenna is simplified more, greatly improve the service behaviour of antenna, reduce the loss of frequency range.That the utility model also has is simple in structure, reasonable in design, aerial signal receptivity is good, mobile phone generation signal is good and automaticity high.
Brief description of the drawings
Fig. 1 is the structural representation of automatic tuning formula antenna for mobile phone of the present utility model.
Main element symbol description is as follows:
10, antenna 11, impedance matching circuit
12, tuning chip 13, antenna feed point
14, impedance feedback point 15, radio system
121, DA converting unit 122, boosting unit
D, variable capacitance diode C, electric capacity
L, aerial coil
Embodiment
In order more clearly to explain the utility model, below in conjunction with accompanying drawing, the utility model is further described.
Refer to Fig. 1, automatic tuning formula antenna for mobile phone of the present utility model, comprises antenna 10, impedance matching circuit 11 and tuning chip 12; Antenna 10 is electrically connected with one end of impedance matching circuit 11 by antenna feed point 13, and the other end of impedance matching circuit 11 is electrically connected with the input of tuning chip 12, and the output of tuning chip 12 is presented a little and 14 is electrically connected with radio system 15 by impedance.
Compared to the situation of prior art, the automatic tuning formula antenna for mobile phone that the utility model provides, in antenna for mobile phone, set up tuning chip 12, when mobile phone frequency is in the time that 800Mhz-2600Mhz changes, tuning chip 12 detects after frequency change, carry out tuning to these antenna 10 frequency ranges, make the capacitance in impedance matching circuit 11 change thereupon and impedance is maintained near 50 Europe, finally realize the impedance matching of antenna terminal impedance and radio system 15, the improvement of this structure can be mated this antenna for mobile phone in automatic tuning, the design of this antenna is simplified more, greatly improve the service behaviour of antenna, reduce the loss of frequency range.That the utility model also has is simple in structure, reasonable in design, aerial signal receptivity is good, mobile phone generation signal is good and automaticity high.
In the present embodiment, the inside of tuning chip 12 is integrated with DA converting unit 121 and boosting unit 122; The other end of impedance matching circuit 11 is electrically connected with the input of boosting unit 122 by DA converting unit 121, and the output of boosting unit 122 is electrically connected with impedance feedback point 14.The chip that tuning chip 12 is low-voltage, DA converting unit 121 and boosting unit 122 actings in conjunction, tuning chip 12 is arranged to the capacitance that frequency difference can control group match circuit 11 and between 1.2Pf-8.2Pf, change, change at 800Mhz-2600Mhz with adaptive mobile phone frequency.This structure utilization conversion and the principle of boosting, to meet the radio-frequency head tuning voltage of needs in tuning chip 12, facilitated the use of this antenna for mobile phone.
In the present embodiment, impedance matching circuit 11 comprises variable capacitance diode D, capacitor C and aerial coil L; The positive pole of variable capacitance diode D is electrically connected to respectively one end of antenna feed point 13 and aerial coil L, the minus earth of variable capacitance diode D, one end of one end electrical connection aerial coil L of capacitor C, the other end ground connection of capacitor C, the other end of aerial coil L is electrically connected to DA converting unit 121.The capacitance of variable capacitance diode D is between 1.2Pf-8.2Pf.Said structure is the match circuit of variable state, also applicable to the match circuit of stationary state.Certainly; the structure of impedance matching circuit 11 is not limited to shown in above-mentioned; can also be directly to use parallel connection or series connection variable diodes as impedance matching circuit 11, if the change of the structure to impedance matching circuit 11 all falls into protection range of the present utility model.
Disclosed is above only several specific embodiment of the present utility model, but the utility model is not limited thereto, and the changes that any person skilled in the art can think of all should fall into protection range of the present utility model.
Claims (4)
1. an automatic tuning formula antenna for mobile phone, is characterized in that, comprises antenna, impedance matching circuit and tuning chip; Described antenna is electrically connected with one end of impedance matching circuit by antenna feed point, and the other end of described impedance matching circuit is electrically connected with the input of tuning chip, and the output of described tuning chip is presented a little and is electrically connected with radio system by impedance.
2. automatic tuning formula antenna for mobile phone according to claim 1, is characterized in that, the inside of described tuning chip is integrated with DA converting unit and boosting unit; The other end of described impedance matching circuit is electrically connected with the input of boosting unit by DA converting unit, and the output of described boosting unit is electrically connected with impedance feedback point.
3. automatic tuning formula antenna for mobile phone according to claim 1, is characterized in that, described impedance matching circuit comprises variable capacitance diode, electric capacity and aerial coil; The positive pole of described variable capacitance diode is electrically connected to respectively one end of antenna feed point and aerial coil, the minus earth of described variable capacitance diode, one end of one end electrical connection aerial coil of described electric capacity, the other end ground connection of described electric capacity, the other end of described aerial coil is electrically connected to DA converting unit.
4. automatic tuning formula antenna for mobile phone according to claim 3, is characterized in that, the capacitance of described variable capacitance diode is between 1.2Pf-8.2Pf.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320742847.8U CN203747049U (en) | 2013-11-22 | 2013-11-22 | Self-tuning cell phone antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320742847.8U CN203747049U (en) | 2013-11-22 | 2013-11-22 | Self-tuning cell phone antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203747049U true CN203747049U (en) | 2014-07-30 |
Family
ID=51346811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320742847.8U Expired - Fee Related CN203747049U (en) | 2013-11-22 | 2013-11-22 | Self-tuning cell phone antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203747049U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107359885A (en) * | 2016-05-10 | 2017-11-17 | 络达科技股份有限公司 | Impedance detection and adjustment circuit |
| CN109150326A (en) * | 2018-11-05 | 2019-01-04 | Oppo（重庆）智能科技有限公司 | Antenna impedance adjustment method, electronic device and computer readable storage medium |
| CN110444885A (en) * | 2019-08-28 | 2019-11-12 | Oppo（重庆）智能科技有限公司 | A kind of antenna module, mobile phone, control method and electronic equipment |
| CN110808466A (en) * | 2019-11-15 | 2020-02-18 | Oppo广东移动通信有限公司 | Antenna module and terminal |
-
2013
- 2013-11-22 CN CN201320742847.8U patent/CN203747049U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107359885A (en) * | 2016-05-10 | 2017-11-17 | 络达科技股份有限公司 | Impedance detection and adjustment circuit |
| CN109150326A (en) * | 2018-11-05 | 2019-01-04 | Oppo（重庆）智能科技有限公司 | Antenna impedance adjustment method, electronic device and computer readable storage medium |
| CN110444885A (en) * | 2019-08-28 | 2019-11-12 | Oppo（重庆）智能科技有限公司 | A kind of antenna module, mobile phone, control method and electronic equipment |
| CN110808466A (en) * | 2019-11-15 | 2020-02-18 | Oppo广东移动通信有限公司 | Antenna module and terminal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140730 Termination date: 20161122 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |