CN102882547A - Antenna connecting circuit and communication device - Google Patents
Antenna connecting circuit and communication device Download PDFInfo
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- CN102882547A CN102882547A CN2012103914424A CN201210391442A CN102882547A CN 102882547 A CN102882547 A CN 102882547A CN 2012103914424 A CN2012103914424 A CN 2012103914424A CN 201210391442 A CN201210391442 A CN 201210391442A CN 102882547 A CN102882547 A CN 102882547A
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Abstract
The invention discloses an antenna connecting circuit and a communication device. The antenna connecting circuit comprises a detecting circuit, a switching circuit, an external antenna circuit and an internal antenna circuit. The external antenna circuit is used for being connected with an external antenna; the internal antenna circuit is used for being connected with an internal antenna; the detecting circuit is used for detecting a carrier-operated antinoise signal; and the switching circuit is used for switching the connection between a radio frequency transceiving circuit and the external antenna circuit into the connection between the radio frequency transceiving circuit and the internal antenna circuit when the strength of the carrier-operated antinoise signal is lower than a first preset threshold value. By using the antenna connecting circuit and the communication device, when the detecting circuit detects that the strength of the carrier-operated antinoise signal of the external antenna is lower, the switching circuit switches the connection between the radio frequency transceiving circuit and the external antenna circuit into the connection between the radio frequency transceiving circuit and the internal antenna circuit, and therefore, the normal operation of the communication device is ensured after the external antenna is damaged.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of antenna connecting circuit and communication equipment.
Background technology
Traditional communication equipment arranges external antenna, with and the base station between communicate.External antenna is arranged at the outside of communication equipment, in the actual use procedure of communication equipment, tends to abominable or force majeure because of environment for use and external antenna is wrecked affect the proper communication of communication equipment.
Summary of the invention
The technical problem to be solved in the present invention is in order to overcome the defective that rear communication equipment can't proper communication that wrecks of external antenna in the prior art, and a kind of antenna connecting circuit and communication equipment that communication equipment still can proper communication after external antenna wrecks that make is provided.
The present invention solves above-mentioned technical problem by following technical proposals:
A kind of antenna connecting circuit comprises testing circuit, commutation circuit, external antenna circuit and built-in aerial circuit,
Described external antenna circuit is used for connecting external antenna;
Described built-in aerial circuit is used for connecting built-in aerial;
Described testing circuit is for detection of the carrier wave purified signal of described external antenna;
Described commutation circuit is used for when the intensity of described carrier wave purified signal is lower than default first threshold radio-frequency (RF) transmit-receive circuit being switched to the described built-in aerial circuit of connection from connecting described external antenna circuit.
Preferably, described commutation circuit also is used for when the intensity of described carrier signal is higher than default Second Threshold radio-frequency (RF) transmit-receive circuit is switched to and connects described external antenna circuit from connecting described built-in aerial circuit, described Second Threshold greater than and/or equal described first threshold.
Preferably, described commutation circuit comprises duplexer, and described duplexer is used for described radio-frequency (RF) transmit-receive circuit switching is connected to described external antenna circuit or described built-in aerial circuit.
Preferably, described commutation circuit also comprises pull-up resistor and triode, the base stage of described triode connects described duplexer and is used for connecing controller, the grounded emitter of described triode, collector electrode connects an end and the described duplexer of described pull-up resistor, the other end input positive voltage signal of described pull-up resistor; When described controller was controlled described triode conducting, described duplexer was connected to described built-in aerial circuit with described radio-frequency (RF) transmit-receive circuit switching; When described controller controlled described triode and cuts out, described duplexer switched described radio-frequency (RF) transmit-receive circuit and is connected to described external antenna circuit.
Preferably, described duplexer links to each other with described radio-frequency (RF) transmit-receive circuit by the 7th electric capacity.
Preferably, described external antenna circuit comprises the first electric capacity and main interface, a termination commutation circuit of described the first electric capacity, and the other end links to each other with described main interface, and described main interface is used for connecting described external antenna.
Preferably, described external antenna circuit comprises that also first reserves inductance, the first reservation electric capacity and the first one of reserving in the resistance, and described first reserves inductance, the first reservation electric capacity and the first one of reserving in the resistance is connected in series between described the first electric capacity and the described main interface.
Preferably, described external antenna circuit also comprises the second electric capacity and the 3rd electric capacity, and a termination of described the second electric capacity described first is reserved inductance, first and reserved the end that electric capacity and first is reserved the one in the resistance, the other end ground connection of described the second electric capacity; One termination of described the 3rd electric capacity described first is reserved inductance, first and is reserved the other end that electric capacity and first is reserved the one in the resistance, the other end ground connection of described the 3rd electric capacity.
Preferably, described built-in aerial circuit comprises that second reserves inductance, the second reservation electric capacity and the second one and the 4th electric capacity, the 5th electric capacity, the 6th electric capacity and satellite interface of reserving in the resistance, the described commutation circuit of one termination of described the 4th electric capacity, another termination described second is reserved inductance, second and is reserved an end of the one in electric capacity and the second reservation resistance and an end of described the 5th electric capacity, the other end ground connection of described the 5th electric capacity; Described second reserves inductance, second reserves the described satellite interface of another termination of the one in electric capacity and the second reservation resistance and an end of described the 6th electric capacity, the other end ground connection of described the 6th electric capacity.
A kind of communication equipment, comprise a radio-frequency (RF) transceiver, also comprise external antenna, built-in aerial and antenna connecting circuit described above, described external antenna is used for connecting described external antenna circuit, described built-in aerial is used for connecting described built-in aerial circuit, and described radio-frequency (RF) transceiver links to each other with described commutation circuit by described radio-frequency (RF) transmit-receive circuit.
Positive progressive effect of the present invention is: above-mentioned antenna connecting circuit and communication equipment, when the carrier wave purified signal intensity that detects external antenna at testing circuit is weak, commutation circuit switches to radio-frequency (RF) transmit-receive circuit and being connected of external antenna circuit with the built-in aerial circuit and is connected, thereby guarantees the normal operation of communication equipment after external antenna wrecks.
Description of drawings
Fig. 1 is the module map of the embodiment of the invention 1.
Fig. 2 is the circuit theory diagrams of the embodiment of the invention 1.
Embodiment
Provide preferred embodiment of the present invention below in conjunction with accompanying drawing, to describe technical scheme of the present invention in detail.
Embodiment 1
As depicted in figs. 1 and 2, a kind of antenna connecting circuit comprises testing circuit 110, commutation circuit 120, external antenna circuit 130 and built-in aerial circuit 140.
Testing circuit 100 is for detection of the carrier wave purified signal (CSQ value) of external antenna.Usually, testing circuit 100 detects the carrier wave purified signal of external antenna, and when the carrier wave purified signal that detects was lower than some strength, commutation circuit 120 was carried out change action.
Commutation circuit 120 is used for when the intensity of carrier wave purified signal is lower than default first threshold radio-frequency (RF) transmit-receive circuit being switched to connection built-in aerial circuit 140 from connecting external antenna circuit 130, and radio-frequency (RF) transmit-receive circuit is used for receiving and sending radiofrequency signal.In the present embodiment, commutation circuit 120 comprises duplexer S, duplexer S is used for the radio-frequency (RF) transmit-receive circuit switching is connected to built-in aerial circuit 140 from being connected to 130 switchings of external antenna circuit, with when external antenna can't work, utilize built-in aerial to guarantee the normal operation of communication equipment.In addition, commutation circuit 120 also comprises pull-up resistor R
1With triode Q.The base stage of triode Q connects duplexer S and is used for connecing controller, and controller is MCU(Microcontroller Unit, microcontroller).The grounded emitter of triode Q, collector electrode connect draws resistance R
1An end and duplexer S, pull-up resistor R
1Other end input positive voltage signal.When the intensity of the carrier wave purified signal that detects at testing circuit 110 is lower than first threshold, controller control triode Q conducting, duplexer S switches radio-frequency (RF) transmit-receive circuit and is connected to built-in aerial circuit 140.For example, between the intensity mobility scale 0 ~ 31 of carrier wave purified signal, be lower than at 8 o'clock in the continuous intensity that detects the carrier wave purified signal for 3 times of testing circuit 110 equipment, controller control antenna switch S switches to built-in aerial.Be understood that detection number of times and the first threshold of testing circuit 110 can be adjusted as required.Duplexer S is by the 7th capacitor C
7Link to each other with radio-frequency (RF) transmit-receive circuit.
Built-in aerial circuit 140 is used for connecting built-in aerial.In the present embodiment, built-in aerial circuit 140 comprises that second reserves inductance, the second reservation electric capacity and the second reservation resistance R
3In one and the 4th capacitor C
4, the 5th capacitor C
5, the 6th capacitor C
6And satellite interface I
2The 4th capacitor C
4A termination duplexer S, another termination second is reserved inductance, second and is reserved electric capacity and second and reserve resistance R
3In an end and the 5th capacitor C of one
5An end, the 5th capacitor C
5Other end ground connection.Second reserves inductance, second reserves electric capacity and the second reservation resistance R
3In another termination satellite interface I of one
2With the 6th capacitor C
6An end, the 6th capacitor C
6Other end ground connection.Only provided among Fig. 2 with second and reserved resistance R
3Built-in aerial circuit 140, in the reality, can be as required reserve resistance R with second
3Be replaced by second and reserve inductance or the second reservation electric capacity.Wherein the second inductance value, second of reserving inductance is reserved capacity and the first reservation resistance R of electric capacity
3Resistance value can adjust as required.Usually, the 4th capacitor C
4Play the logical effect that exchanges of stopping direct current.Second reserves inductance, second reserves electric capacity and the second reservation resistance R
3In one, the 5th capacitor C
5With the 6th capacitor C
6Form a PI type match circuit (circuit that those skilled in the art commonly use), so that the radio-frequency (RF) match of debugging built-in aerial and satellite interface.
Above-mentioned antenna connecting circuit, when the carrier wave purified signal intensity that detects external antenna at testing circuit 110 is weak, commutation circuit 140 switches to radio-frequency (RF) transmit-receive circuit and being connected of external antenna circuit 130 with built-in aerial circuit 140 and is connected, thereby guarantees the normal operation of communication equipment after external antenna wrecks.
In the present embodiment, commutation circuit 120 also is used for when the intensity of carrier signal is higher than default Second Threshold radio-frequency (RF) transmit-receive circuit being switched 140 to connecting external antenna circuit 130 from connecting the built-in aerial circuit.Usually, Second Threshold greater than and/or equal first threshold, when the intensity of the carrier wave purified signal that detects at testing circuit 110 is lower than first threshold, controller control triode Q conducting, commutation circuit 120 is switched and is connected to built-in aerial; The carrier wave purified signal that detects at testing circuit 110 greater than first threshold during less than Second Threshold, controller is in hold mode, commutation circuit 120 is failure to actuate; The carrier wave purified signal that detects at testing circuit 110 greater than Second Threshold the time, controller control triode Q closes, commutation circuit 120 is switched and is connected to external antenna.Be understood that first threshold also can equal Second Threshold.The antenna connecting circuit of present embodiment, external antenna is repaired after, communication equipment switches to external antenna work.
Embodiment 2
A kind of communication equipment comprises the antenna connecting circuit an of radio-frequency (RF) transceiver, external antenna, built-in aerial and above-described embodiment.External antenna is used for connecting the external antenna circuit, and built-in aerial is used for connecting the built-in aerial circuit, and radio-frequency (RF) transceiver links to each other with commutation circuit by radio-frequency (RF) transmit-receive circuit.
The communication equipment of present embodiment, when the carrier wave purified signal intensity that detects external antenna at testing circuit is weak, commutation circuit switches to radio-frequency (RF) transmit-receive circuit and being connected of external antenna circuit with the built-in aerial circuit and is connected, thereby guarantees the normal operation of communication equipment after external antenna wrecks.After external antenna was repaired, commutation circuit switched to external antenna, and communication equipment switches to external antenna work.
Although more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, protection scope of the present invention is limited by appended claims.Those skilled in the art can make various changes or modifications to these execution modes under the prerequisite that does not deviate from principle of the present invention and essence, but these changes and modification all fall into protection scope of the present invention.
Claims (10)
1. an antenna connecting circuit is characterized in that, comprises testing circuit, commutation circuit, external antenna circuit and built-in aerial circuit,
Described external antenna circuit is used for connecting external antenna;
Described built-in aerial circuit is used for connecting built-in aerial;
Described testing circuit is for detection of the carrier wave purified signal of described external antenna;
Described commutation circuit is used for when the intensity of described carrier wave purified signal is lower than default first threshold radio-frequency (RF) transmit-receive circuit being switched to the described built-in aerial circuit of connection from connecting described external antenna circuit.
2. antenna connecting circuit as claimed in claim 1, it is characterized in that, described commutation circuit also is used for when the intensity of described carrier signal is higher than default Second Threshold radio-frequency (RF) transmit-receive circuit is switched to and connects described external antenna circuit from connecting described built-in aerial circuit, described Second Threshold greater than and/or equal described first threshold.
3. antenna connecting circuit as claimed in claim 1 is characterized in that, described commutation circuit comprises duplexer, and described duplexer is used for described radio-frequency (RF) transmit-receive circuit switching is connected to described external antenna circuit or described built-in aerial circuit.
4. antenna connecting circuit as claimed in claim 3, it is characterized in that, described commutation circuit also comprises pull-up resistor and triode, the base stage of described triode connects described duplexer and is used for connecing controller, the grounded emitter of described triode, collector electrode connects an end and the described duplexer of described pull-up resistor, the other end input positive voltage signal of described pull-up resistor; When described controller was controlled described triode conducting, described duplexer was connected to described built-in aerial circuit with described radio-frequency (RF) transmit-receive circuit switching; When described controller controlled described triode and cuts out, described duplexer switched described radio-frequency (RF) transmit-receive circuit and is connected to described external antenna circuit.
5. antenna connecting circuit as claimed in claim 3 is characterized in that, described duplexer links to each other with described radio-frequency (RF) transmit-receive circuit by the 7th electric capacity.
6. antenna connecting circuit as claimed in claim 1, it is characterized in that described external antenna circuit comprises the first electric capacity and main interface, a termination commutation circuit of described the first electric capacity, the other end links to each other with described main interface, and described main interface is used for connecting described external antenna.
7. antenna connecting circuit as claimed in claim 6, it is characterized in that, described external antenna circuit comprises that also first reserves inductance, the first reservation electric capacity and the first one of reserving in the resistance, and described first reserves inductance, the first reservation electric capacity and the first one of reserving in the resistance is connected in series between described the first electric capacity and the described main interface.
8. antenna connecting circuit as claimed in claim 7, it is characterized in that, described external antenna circuit also comprises the second electric capacity and the 3rd electric capacity, one termination of described the second electric capacity described first is reserved inductance, first and is reserved the end that electric capacity and first is reserved the one in the resistance, the other end ground connection of described the second electric capacity; One termination of described the 3rd electric capacity described first is reserved inductance, first and is reserved the other end that electric capacity and first is reserved the one in the resistance, the other end ground connection of described the 3rd electric capacity.
9. antenna connecting circuit as claimed in claim 1, it is characterized in that, described built-in aerial circuit comprises that second reserves inductance, the second reservation electric capacity and the second one and the 4th electric capacity, the 5th electric capacity, the 6th electric capacity and satellite interface of reserving in the resistance, the described commutation circuit of one termination of described the 4th electric capacity, another termination described second is reserved inductance, second and is reserved an end of the one in electric capacity and the second reservation resistance and an end of described the 5th electric capacity, the other end ground connection of described the 5th electric capacity; Described second reserves inductance, second reserves the described satellite interface of another termination of the one in electric capacity and the second reservation resistance and an end of described the 6th electric capacity, the other end ground connection of described the 6th electric capacity.
10. communication equipment, comprise a radio-frequency (RF) transceiver, it is characterized in that, also comprise the described antenna connecting circuit of any one in external antenna, built-in aerial and the claim 1 to 8, described external antenna is used for connecting described external antenna circuit, described built-in aerial is used for connecting described built-in aerial circuit, and described radio-frequency (RF) transceiver links to each other with described commutation circuit by described radio-frequency (RF) transmit-receive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103914424A CN102882547A (en) | 2012-10-15 | 2012-10-15 | Antenna connecting circuit and communication device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103914424A CN102882547A (en) | 2012-10-15 | 2012-10-15 | Antenna connecting circuit and communication device |
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| CN102882547A true CN102882547A (en) | 2013-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012103914424A Pending CN102882547A (en) | 2012-10-15 | 2012-10-15 | Antenna connecting circuit and communication device |
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Cited By (8)
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| CN105487086A (en) * | 2014-09-19 | 2016-04-13 | 成都国星通信有限公司 | Device and method for antenna automatic identification and switching |
| CN106130572A (en) * | 2016-07-29 | 2016-11-16 | 广东欧珀移动通信有限公司 | Method, device and the mobile terminal of a kind of switching terminal antenna |
| CN106252838A (en) * | 2016-08-26 | 2016-12-21 | 珠海格力电器股份有限公司 | Auxiliary antenna method to set up, device and there is the mobile phone of this device |
| CN106408688A (en) * | 2015-07-27 | 2017-02-15 | 法雷奥舒适驾驶助手公司 | Improvement of identity code recognition in polling recognition |
| CN107425860A (en) * | 2017-04-25 | 2017-12-01 | 广东欧珀移动通信有限公司 | Antenna switching system and mobile terminal |
| CN109782302A (en) * | 2019-01-29 | 2019-05-21 | 广东北斗星盛教育科技有限公司 | A kind of built-in antenna of satellite positioning communication terminal and external automatic switching control equipment |
| CN111817747A (en) * | 2020-07-24 | 2020-10-23 | 深圳市友华通信技术有限公司 | Antenna intelligent switching device and wireless router |
| US11038603B2 (en) | 2019-03-29 | 2021-06-15 | Neptune Technology Group Inc. | Antenna detection through noise measurement |
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| CN105487086A (en) * | 2014-09-19 | 2016-04-13 | 成都国星通信有限公司 | Device and method for antenna automatic identification and switching |
| CN106408688A (en) * | 2015-07-27 | 2017-02-15 | 法雷奥舒适驾驶助手公司 | Improvement of identity code recognition in polling recognition |
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| US11038603B2 (en) | 2019-03-29 | 2021-06-15 | Neptune Technology Group Inc. | Antenna detection through noise measurement |
| US11496229B2 (en) | 2019-03-29 | 2022-11-08 | Neptune Technology Group Inc. | Antenna detection using antenna return loss |
| US11509406B2 (en) | 2019-03-29 | 2022-11-22 | Neptune Technology Group Inc. | Antenna assembly detection based on oscillator and variable reactance tank circuit |
| CN111817747A (en) * | 2020-07-24 | 2020-10-23 | 深圳市友华通信技术有限公司 | Antenna intelligent switching device and wireless router |
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Application publication date: 20130116 |