CN104579407A - Wireless communication device - Google Patents
Wireless communication device Download PDFInfo
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- CN104579407A CN104579407A CN201310513163.5A CN201310513163A CN104579407A CN 104579407 A CN104579407 A CN 104579407A CN 201310513163 A CN201310513163 A CN 201310513163A CN 104579407 A CN104579407 A CN 104579407A
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Abstract
The invention provides a wireless communication device. The wireless communication device comprises an antenna, a transmitter, a power amplifier, a coupler, a wave detector, an adjusting unit and a matching circuit, wherein the transmitter is electrically connected with the power amplifier, the transmitter is used for outputting a voltage signal according to the strength of a signal received by the wireless communication device at present so as to control the output power of the power amplifier, the coupler is electrically connected with the power amplifier and is used for coupling a certain power to the wave detector according to a preset coupling coefficient, and the wave detector is electrically connected with the adjusting unit and is used for outputting control voltage according to the coupled power and further changing a circuit parameter of the adjusting unit so as to enable the adjusting unit and the matching circuit to jointly adjust the impedance of the antenna. The wireless communication device can effectively improve the performance of the antenna.
Description
Technical field
The present invention relates to a kind of radio communication device, particularly relate to a kind of radio communication device that can improve low-band signal tranception-quality.
Background technology
Current, the Antenna Design difficult point of radio communication device is low-frequency range bandwidth, such as, for the GSM900 system of low-frequency range, is usually difficult to the bandwidth covering 880-960MHz.And, when radio communication device is in feeble field, such as at basement or when gripping radio communication device as user, its received signal strength (Received Signal Strength Indication, RSSI) value can reduce further, thus the signal frequency making antenna receive and dispatch produces change, i.e. frequency deviation effect.When frequency deviation effect produces, radio communication device can be caused to occur the phenomenons such as feeble field call drop, have a strong impact on speech quality.
Summary of the invention
In view of above content, be necessary to provide a kind of radio communication device that can improve low-band signal tranception-quality.
A kind of radio communication device, it comprises antenna, reflector, power amplifier, coupler, wave detector, adjustment unit and match circuit, this reflector and power amplifier are electrically connected, this reflector is used for the received signal strength output voltage signal according to Current wireless communication device, to control the power output of power amplifier, this coupler and power amplifier are electrically connected, for being coupled certain power to wave detector according to the coupling coefficient preset, this wave detector and adjustment unit are electrically connected, for the circuit parameter according to the power stage control voltage be coupled and then change adjustment unit, this adjustment unit and match circuit is made jointly to adjust the impedance of antenna.
A kind of radio communication device, it comprises antenna, reflector, power amplifier, coupler, wave detector, adjustment unit and match circuit, this reflector and power amplifier are electrically connected, this reflector is used for the received signal strength output voltage signal according to Current wireless communication device, to control the power output of power amplifier, this coupler and power amplifier are electrically connected, for being coupled according to the coupling coefficient preset, certain power exports direct current to wave detector to control wave detector, this adjustment unit has an initial capacitance value and a threshold voltage, when described galvanic voltage is higher than threshold voltage, the initial capacitance value of this adjustment unit rises, when described galvanic voltage is lower than threshold voltage, the initial capacitance value of this adjustment unit is constant, this adjustment unit and match circuit are electrically connected, for jointly adjusting the impedance of antenna.
The reflector of above-mentioned radio communication device exports corresponding voltage signal according to current received signal strength, and then controls the power of radiofrequency signal according to voltage signal.Coupler is coupled certain power to wave detector simultaneously, wave detector is made to export direct current to control adjustment unit, and jointly adjust the impedance matching of antenna by the capacitance (initial capacitance value or the capacitance after changing) of this adjustment unit with match circuit, therefore, even if when feeble field environment, the performance of antenna also can promote, thus improves the signal transmitting and receiving quality of radio communication device in low-frequency range.
Accompanying drawing explanation
Fig. 1 is the functional block diagram of the radio communication device of present pre-ferred embodiments.
Fig. 2 is the circuit diagram of the wave detector of radio communication device shown in Fig. 1.
Main element symbol description
| Radio communication device | 100 |
| Reflector | 10 |
| Power amplifier | 20 |
| Coupler | 30 |
| Wave detector | 40 |
| Diode | D |
| Inductance | L |
| Resistance | R |
| Electric capacity | C |
| Filter capacitor | C1 |
| Duplexer | 50 |
| Adjustment unit | 60 |
| Match circuit | 70 |
| Antenna | 90 |
Following embodiment will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.
Embodiment
Refer to Fig. 1, preferred embodiment of the present invention provides a kind of radio communication device 100, and it can be mobile phone, personal digital assistant (PDA), panel computer etc.This radio communication device 100 can work in different systems, such as GSM850/900/1800/1900 and WCDMA900/2100 etc.In the present embodiment, introduced for the radio communication device 100 of the GSM900 system working in low-frequency range.
This radio communication device 100 comprises reflector 10, power amplifier 20, coupler 30, wave detector 40, duplexer 50, adjustment unit 60, match circuit 70 and antenna 90.
This reflector 10 is for emitting radio frequency signal.In addition, this reflector 10 is also for exporting corresponding voltage signal Vramp according to the received signal strength RSSI current according to radio communication device 100.In the present embodiment, the voltage of this voltage signal Vramp and the value of received signal strength RSSI are inversely proportional to.That is, the value of this received signal strength RSSI is lower, and the voltage of this voltage signal Vramp is higher.Usually, when radio communication device 100 is in high field environment, such as, when being positioned over desktop, the value of its received signal strength RSSI is higher; When radio communication device 100 is in feeble field environment, such as, when being gripped by the hand of user, the value of its received signal strength RSSI is lower.
This power amplifier 20 is electrically connected with reflector 10, for receiving and the radiofrequency signal of amplifying emission device 10 transmitting.The multiplication factor of this power amplifier 20 radio frequency signal is determined by the voltage of voltage signal Vramp, and namely the voltage of voltage signal Vramp is higher, and the power of the radiofrequency signal that power amplifier 20 exports is higher; The voltage of voltage signal Vramp is lower, and the power of the radiofrequency signal that power amplifier 20 exports is lower.
This coupler 30 is electrically connected between power amplifier 20 and duplexer 50, and it is sent to duplexer 50 for the radiofrequency signal after being amplified by power amplifier 20.This coupler 30 is also electrically connected with wave detector 40, and its radiofrequency signal for certain power that is coupled according to the coupling coefficient preset is to wave detector 40.Above-mentioned coupling coefficient can set as required and adjust, and the above-mentioned radiofrequency signal being coupled to wave detector 40 is alternating current.
This wave detector 40 for alternating current is converted to direct current, and controls adjustment unit 60 by this direct current.Refer to Fig. 2, in the present embodiment, this wave detector 40 comprises diode D, inductance L, resistance R and electric capacity C.Wherein, the anode of this diode D and one end of inductance L and coupler 30 are electrically connected, and the negative electrode of this diode D and one end of resistance R and electric capacity C are electrically connected, and are jointly electrically connected with adjustment unit 60, this inductance L, resistance R and electric capacity C parallel connection.When the alternating current inputting wave detector is positive half cycle, diode D conducting, electric capacity C charges.Thereafter, diode D ends, and electric capacity C is by resistance R and inductance L electric discharge.By selecting suitable resistance R, inductance L and electric capacity C, the charging rate of electric capacity C is made to be greater than amplification speed.So, the voltage at electric capacity C two ends can remain on maximum voltage place, thus realize peak detection, so that the control voltage of wave detector 40 stable output, in the present embodiment, the direct current of this wave detector 40 stable output, this galvanic voltage is by the power decision of radiofrequency signal being coupled to wave detector 40, when the power of the radiofrequency signal being coupled to wave detector 40 is higher, this galvanic voltage is higher; When the power of the radiofrequency signal being coupled to wave detector 40 is lower, this galvanic voltage is lower.
This duplexer 50 is electrically connected by a filter capacitor C1 and match circuit 70, and this match circuit 70 is electrically connected with antenna 90.This duplexer 50 is for being sent to antenna 90 by radiofrequency signal by match circuit 70.In addition, this filter capacitor C1 is also electrically connected between wave detector 40 and match circuit 70, in order to avoid the direct current that wave detector 40 exports damages match circuit 70.
This adjustment unit 60 is electrically connected between wave detector 40 and match circuit 70, and this adjustment unit 60, under the galvanic control that exports at wave detector 40, adjusts the impedance of antenna 90 jointly with match circuit 70.In the present embodiment, this adjustment unit 60 is a variable capacitance diode (Varactor), and it has an initial capacitance value, and this initial capacitance value changes with the change of additional galvanic voltage.This adjustment unit 60 has a threshold voltage, and when additional galvanic voltage is higher than threshold voltage, the initial capacitance value of this variable capacitance diode raises; When additional galvanic voltage is lower than threshold voltage, the initial capacitance value of this variable capacitance diode is constant.By the adjustment circuit parameter of match circuit 70 and the initial capacitance value of adjustment unit 60, antenna 90 normal transmitting/receiving wireless signal in scheduled frequency range can be made; By changing the initial capacitance value of (rising) adjustment unit 60, the transmitting-receiving frequency of antenna 90 can be made suitably toward high frequency offset.
The using method of this radio communication device 100 is described below in two kinds of situation.
The first, when radio communication device 100 is in high field environment, such as, when being positioned over desktop or using earphone call, the value of its received signal strength RSSI is higher, now this reflector 10 output voltage signal Vramp.Because the value of this received signal strength RSSI is higher, so time voltage signal Vramp voltage lower.Because the voltage of this voltage signal Vramp is lower, the power of the radiofrequency signal that power amplifier 20 is exported is lower, and accordingly, the power that coupler 30 is coupled to the radiofrequency signal of wave detector 40 is also lower.Now, wave detector 40 exports the direct current of low voltage, and this low voltage is not enough to the initial capacitance value changing adjustment unit 60 because of the threshold voltage lower than adjustment unit 60.Now, the impedance matching of antenna 90 is determined jointly by the initial capacitance value of match circuit 70 and adjustment unit 60.It should be noted that, for guaranteeing the threshold voltage of above-mentioned low voltage lower than adjustment unit 60, selecting suitable coupler 30 and coupling coefficient to be very important.
On the other hand, this reflector 10 emitting radio frequency signal, this radiofrequency signal is amplified into coupler 30 through power amplifier 20, and is launched by antenna 90 via after duplexer 50 and match circuit 70.
The second, when radio communication device 100 is in feeble field environment, such as, when being gripped by the hand of user, the lower and frequency of the value of its received signal strength RSSI offsets toward low frequency, now this reflector 10 output voltage signal Vramp.Because the value of this received signal strength RSSI is lower, so time voltage signal Vramp voltage higher.Because the voltage of this voltage signal Vramp is higher, the power of the radiofrequency signal that power amplifier 20 is exported is higher, and accordingly, the power that coupler 30 is coupled to the radiofrequency signal of wave detector 40 is also higher.Now, wave detector 40 exports the direct current of high voltage, and this high voltage raises because making the initial capacitance value of adjustment unit 60 higher than the threshold voltage of adjustment unit 60.Now, the impedance matching of antenna 90 changed by adjustment unit 60 after capacitance and match circuit 70 jointly determine.
On the other hand, this reflector 10 emitting radio frequency signal, this radiofrequency signal is amplified into coupler 30 through power amplifier 20, and is launched by antenna 90 via after duplexer 50, adjustment unit 60 and match circuit 70.Because the initial capacitance value of now adjustment unit 60 raises, therefore the impedance matching of antenna 90 is suitably adjusted, and makes the transmitting-receiving frequency of antenna 90 suitably toward high frequency offset, thus improves the frequency deviation effect because feeble field environment brings.
Due to the value normally process changed of received signal strength RSSI, therefore, voltage signal Vramp, power amplifier 20 export the power of radiofrequency signal, coupler 30 are coupled to the process that galvanic voltage that the power of the radiofrequency signal of wave detector 40 and wave detector 40 export is all changes.Now, the capacitance of adjustment unit 60 also changes accordingly, thus realizes the Dynamic Matching to the impedance of antenna 90, to adapt to different received signal strength RSSI.
The reflector 10 of radio communication device 100 of the present invention exports corresponding voltage signal Vramp according to current received signal strength RSSI, and then controls the power of radiofrequency signal according to voltage signal Vramp.Coupler 30 is coupled certain power to wave detector 40 simultaneously, wave detector 40 is made to export direct current to control adjustment unit 60, and jointly adjust the impedance matching of antenna 90 by the capacitance (initial capacitance value or the capacitance after changing) of this adjustment unit 60 with match circuit 70, therefore, even if when feeble field environment, the performance of antenna 90 also can promote, thus improves the signal transmitting and receiving quality of radio communication device 100 in low-frequency range.
Claims (10)
1. a radio communication device, it comprises antenna, it is characterized in that: this radio communication device also comprises reflector, power amplifier, coupler, wave detector, adjustment unit and match circuit, this reflector and power amplifier are electrically connected, this reflector is used for the received signal strength output voltage signal according to Current wireless communication device, to control the power output of power amplifier, this coupler and power amplifier are electrically connected, for being coupled certain power to wave detector according to the coupling coefficient preset, this wave detector and adjustment unit are electrically connected, for the circuit parameter according to the power stage control voltage be coupled and then change adjustment unit, this adjustment unit and match circuit is made jointly to adjust the impedance of antenna.
2. radio communication device as claimed in claim 1, is characterized in that: when the value of described received signal strength is lower, the voltage of this voltage signal is higher, and the power that power amplifier exports is higher; When the value of described received signal strength is higher, the voltage of this voltage signal is lower, and the power that power amplifier exports is lower.
3. radio communication device as claimed in claim 2, is characterized in that: described wave detector exports direct current, and when the described power being coupled to wave detector is higher, this galvanic voltage is higher.
4. radio communication device as claimed in claim 3, it is characterized in that: described adjustment unit is variable capacitance diode, it has an initial capacitance value and a threshold voltage, and when described galvanic voltage is higher than threshold voltage, the initial capacitance value of this variable capacitance diode rises; When described galvanic voltage is lower than threshold voltage, the initial capacitance value of this variable capacitance diode is constant.
5. radio communication device as claimed in claim 1, it is characterized in that: described wave detector comprises diode, inductance, resistance and electric capacity, the anode of this diode and one end of inductance and coupler are electrically connected, one end of the negative electrode of this diode and resistance and electric capacity is electrically connected, and common and adjustment unit is electrically connected, this inductance, resistance and Capacitance parallel connection.
6. radio communication device as claimed in claim 1, it is characterized in that: described radio communication device also comprises duplexer, described duplexer and coupler are electrically connected, and this duplexer is electrically connected by a filter capacitor and match circuit.
7. a radio communication device, it comprises antenna, it is characterized in that: this radio communication device also comprises reflector, power amplifier, coupler, wave detector, adjustment unit and match circuit, this reflector and power amplifier are electrically connected, this reflector is used for the received signal strength output voltage signal according to Current wireless communication device, to control the power output of power amplifier, this coupler and power amplifier are electrically connected, for being coupled according to the coupling coefficient preset, certain power exports direct current to wave detector to control wave detector, this adjustment unit has an initial capacitance value and a threshold voltage, when described galvanic voltage is higher than threshold voltage, the initial capacitance value of this adjustment unit rises, when described galvanic voltage is lower than threshold voltage, the initial capacitance value of this adjustment unit is constant, this adjustment unit and match circuit are electrically connected, for jointly adjusting the impedance of antenna.
8. radio communication device as claimed in claim 7, it is characterized in that: when the value of described received signal strength is lower, the voltage of this voltage signal is higher, the power that power amplifier exports is higher, the power being coupled to wave detector is higher, and galvanic voltage is higher; When the value of described received signal strength is higher, the voltage of this voltage signal is lower, and the power that power amplifier exports is lower, and the power being coupled to wave detector is lower, and galvanic voltage is lower.
9. radio communication device as claimed in claim 7, is characterized in that: described adjustment unit is variable capacitance diode.
10. radio communication device as claimed in claim 7, it is characterized in that: described wave detector comprises diode, inductance, resistance and electric capacity, the anode of this diode and one end of inductance and coupler are electrically connected, one end of the negative electrode of this diode and resistance and electric capacity is electrically connected, and common and adjustment unit is electrically connected, this inductance, resistance and Capacitance parallel connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310513163.5A CN104579407A (en) | 2013-10-28 | 2013-10-28 | Wireless communication device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310513163.5A CN104579407A (en) | 2013-10-28 | 2013-10-28 | Wireless communication device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104579407A true CN104579407A (en) | 2015-04-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310513163.5A Pending CN104579407A (en) | 2013-10-28 | 2013-10-28 | Wireless communication device |
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| Country | Link |
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| CN (1) | CN104579407A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105812012A (en) * | 2016-05-25 | 2016-07-27 | 海能达通信股份有限公司 | Interphone and circuit for reducing bit error rate of interphone |
| CN105929883A (en) * | 2016-04-12 | 2016-09-07 | 广东欧珀移动通信有限公司 | Method and device for controlling emission current |
| CN107592119A (en) * | 2016-07-07 | 2018-01-16 | 三星电机株式会社 | Radio-frequency switch circuit and the equipment with built-in coupler |
| US10505517B2 (en) | 2016-07-07 | 2019-12-10 | Samsung Electro-Mechanics Co., Ltd. | Radio frequency switch circuit and apparatus having built-in coupler |
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| CN1870555A (en) * | 2005-04-07 | 2006-11-29 | 日立金属株式会社 | High-frequency circuit and communication device using same |
| CN101197580A (en) * | 2006-12-06 | 2008-06-11 | 联想移动通信科技有限公司 | Impedance matching and processing equipment and method thereof |
| CN102420353A (en) * | 2010-09-28 | 2012-04-18 | 宏达国际电子股份有限公司 | Antenna module |
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2013
- 2013-10-28 CN CN201310513163.5A patent/CN104579407A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1870555A (en) * | 2005-04-07 | 2006-11-29 | 日立金属株式会社 | High-frequency circuit and communication device using same |
| CN101197580A (en) * | 2006-12-06 | 2008-06-11 | 联想移动通信科技有限公司 | Impedance matching and processing equipment and method thereof |
| CN102420353A (en) * | 2010-09-28 | 2012-04-18 | 宏达国际电子股份有限公司 | Antenna module |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105929883A (en) * | 2016-04-12 | 2016-09-07 | 广东欧珀移动通信有限公司 | Method and device for controlling emission current |
| CN105812012A (en) * | 2016-05-25 | 2016-07-27 | 海能达通信股份有限公司 | Interphone and circuit for reducing bit error rate of interphone |
| CN105812012B (en) * | 2016-05-25 | 2019-09-06 | 海能达通信股份有限公司 | Intercom and the circuit for reducing its bit error rate |
| CN107592119A (en) * | 2016-07-07 | 2018-01-16 | 三星电机株式会社 | Radio-frequency switch circuit and the equipment with built-in coupler |
| CN107592119B (en) * | 2016-07-07 | 2019-11-05 | 三星电机株式会社 | Radio-frequency switch circuit and equipment with built-in coupler |
| US10505517B2 (en) | 2016-07-07 | 2019-12-10 | Samsung Electro-Mechanics Co., Ltd. | Radio frequency switch circuit and apparatus having built-in coupler |
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Application publication date: 20150429 |
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