CN209913813U - Radio frequency circuit and mobile terminal - Google Patents
Radio frequency circuit and mobile terminal Download PDFInfo
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- CN209913813U CN209913813U CN201821358610.9U CN201821358610U CN209913813U CN 209913813 U CN209913813 U CN 209913813U CN 201821358610 U CN201821358610 U CN 201821358610U CN 209913813 U CN209913813 U CN 209913813U
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Abstract
The embodiment of the utility model provides a radio frequency circuit and mobile terminal relates to communication technology field to solve the higher problem of mobile terminal's cost. Wherein, the radio frequency circuit includes: the antenna, the control switch and the signal transmitting and receiving device; the fixed end of the control switch is connected with the antenna, and the movable end of the control switch is connected with the signal transmitting and receiving device; the signal transmitting and receiving device is at least used for transmitting signals of a first frequency band and/or signals of a second frequency band and receiving the signals of the first frequency band and/or the signals of the second frequency band; wherein the frequency range of the first frequency band comprises the frequency range of the second frequency band. The embodiment of the utility model provides an in radio frequency circuit is applied to among the mobile terminal.
Description
Technical Field
The embodiment of the utility model provides a relate to communication technology field, especially relate to a radio frequency circuit and mobile terminal.
Background
With the development of communication technology, the number of wireless communication functions integrated by the mobile terminal is increasing, and the number of supported frequency bands is further increasing. For example, a 3rd-Generation (3G) network only uses about five frequency bands, and a Long Term Evolution (LTE) network of the universal mobile telecommunications technology currently uses more than 40 frequency bands, and the number of frequency bands used is further increased with the arrival of a 5rd-Generation (5G).
Signals in each frequency band need to have a corresponding set of devices to implement receiving and transmitting of signals, so that in order to support a large number of frequency bands, more devices need to be added to the radio frequency components of the mobile terminal.
More devices lead to the increasing limitation of the space of a Printed Circuit Board (PCB for short), which not only has higher design requirements on the PCB and increases the production cost, but also increases the material cost due to more devices, thereby leading to higher cost of the mobile terminal.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a radio frequency circuit to solve the higher problem of mobile terminal's cost.
In order to solve the technical problem, the utility model discloses a realize like this: a radio frequency circuit, comprising: the antenna, the control switch and the signal transmitting and receiving device; the fixed end of the control switch is connected with the antenna, and the movable end of the control switch is connected with the signal transmitting and receiving device; the signal transmitting and receiving device is at least used for transmitting signals of a first frequency band and/or signals of a second frequency band and receiving the signals of the first frequency band and/or the signals of the second frequency band; wherein the frequency range of the first frequency band comprises the frequency range of the second frequency band.
On the other hand, the embodiment of the utility model provides a still provide a mobile terminal, include: the radio frequency circuit is provided.
In the embodiment of the present invention, when the antenna receives the signal of the first frequency band, the control switch is connected to the corresponding device of the signal transmitting/receiving device based on the signal received by the antenna, so as to receive and transmit the signal of the first frequency band; when the antenna receives the signal of the second frequency band, the control switch is connected with the corresponding device of the signal transmitting and receiving device based on the signal received by the antenna, and the signal of the second frequency band is received and transmitted. Because the frequency range of the first frequency band contains the frequency range of the second frequency band, the signal transmitting and receiving device can also receive and transmit the signal of the frequency range of the second frequency band contained in the first frequency band range on the premise of receiving and transmitting the signal of the first frequency band, so that the two frequency bands share the signal transmitting and receiving device, a group of devices are reduced, the space occupied by the radio frequency circuit on a PCB is reduced, the PCB is optimized, the processing difficulty is reduced, and the performance of the mobile terminal is ensured. It is visible, the embodiment of the utility model provides a radio frequency circuit has not only reduced material cost, has reduced the processing cost moreover for mobile terminal's cost reduction.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a first circuit diagram of a radio frequency circuit of an embodiment of the present invention;
fig. 2 is a second circuit diagram of the rf circuit according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Example one
Referring to fig. 1, the present embodiment provides a radio frequency circuit including: an antenna 10, a control switch 20 and a signal transmitting and receiving device 30; the fixed end of the control switch 20 is connected with the antenna 10, and the movable end of the control switch 20 is connected with the signal transmitting and receiving device 30; the signal transmitting and receiving device 30 is at least used for transmitting signals of the first frequency band and/or signals of the second frequency band, and receiving signals of the first frequency band and/or signals of the second frequency band; the frequency range of the first frequency band comprises the frequency range of the second frequency band.
The working principle of the radio frequency circuit in this embodiment is as follows: the radio frequency circuit works in a first frequency band at a certain period, and according to the signal received by the antenna 10, the active end of the control switch 20 is controlled to be connected with a corresponding device in the signal transmitting and receiving device 30, so as to realize the receiving and transmitting of the signal in the first frequency band; or, the radio frequency circuit works in a second frequency band at a certain time period, and according to the signal received by the antenna 10, the active end of the control switch 20 is controlled to be connected with a corresponding device in the signal transmitting and receiving device 30, so as to realize the receiving and transmitting of the signal in the second frequency band; or the radio frequency circuit does not work in any frequency band of the first frequency band and the second frequency band in a certain period of time, and the active end of the control switch 20 is controlled to be disconnected with the corresponding device in the signal transmitting and receiving device 30.
It should be noted that the signal transmitting and receiving device 30 includes many devices, and the devices are only used for transmitting and receiving signals in the first frequency band and/or signals in the second frequency band.
Since the frequency band range of the first frequency band includes the frequency band range of the second frequency band, the signal transmitting/receiving device 30 can also receive and transmit signals within the frequency band range of the second frequency band on the premise that the signals within the frequency band range of the first frequency band can be received and transmitted.
In a specific implementation process, the control switch 20 may be controlled to connect to a corresponding device according to which frequency band the antenna 10 is currently operating in.
As can be seen, in the embodiment, two groups of devices in the signal transmitting and receiving device 30 corresponding to the first frequency band and the second frequency band are reduced to one group, so that on one hand, the space occupied by the radio frequency circuit on the PCB is reduced, and the PCB is optimized, thereby ensuring the performance of the mobile terminal; on the other hand, the cost of a group of devices is reduced, meanwhile, the difficulty of complex processing caused by the increase of the devices is avoided, the processing cost is reduced, more importantly, the risk caused by the introduction of more new devices is avoided, and the reliability of the mobile terminal is further ensured.
It should be noted that the present embodiment is applicable to at least the first frequency band and the second frequency band, and in more embodiments, the present embodiment may also be applicable to frequency bands in more ranges, but it is a precondition that the frequency band ranges of all the frequency bands are included in the frequency band range of the first frequency band.
Preferably, the first frequency band and the second frequency band are both FDD frequency bands; the signal transmitting-receiving device 30 includes a duplexer; the active terminal of the control switch 20 is connected to the duplexer.
Since Frequency Division Duplex (FDD) Frequency bands exist simultaneously for transmission and reception, simultaneous conduction of transmission and reception paths is required. The signal transmitting-receiving device 30 in the present embodiment is preferably a duplexer.
In the two frequency bands, i.e., the first frequency band and the second frequency band, no matter which frequency band the radio frequency circuit is currently in, the active end of the control switch 20 needs to be connected to the duplexer.
Preferably, the control switch 20 in this embodiment may be a single pole, single throw switch.
Preferably, the first frequency band and the second frequency band are both TDD frequency bands; the signal transmitting-receiving device 30 includes a transmitting filter and a receiving filter; the transmitting filter is at least used for transmitting signals of a first frequency band and/or signals of a second frequency band; the receiving filter is at least used for receiving signals of a first frequency band and/or signals of a second frequency band; the active terminal of the control switch 20 is connected to a transmit filter or a receive filter.
Since Time Division Duplex (TDD) frequency bands are alternately transmitted and received, the transmission and reception paths need to be conducted at different times. The signal transmitting-receiving device 30 in the present embodiment is preferably a transmitting filter and a receiving filter. The filter may pass desired frequencies while rejecting undesired frequencies.
In the two frequency bands, namely the first frequency band and the second frequency band, no matter which frequency band the radio frequency circuit is currently in, if the radio frequency circuit is receiving, the active end of the control switch 20 is connected with the receiving filter, and if the radio frequency circuit is transmitting, the active end of the control switch 20 is connected with the transmitting filter.
Preferably, the control switch 20 in this embodiment may be a single pole double throw switch.
Referring to fig. 1, preferably, one of the first frequency band and the second frequency band is a TDD frequency band, and the other is an FDD frequency band; the signal transmitting-receiving device 30 includes a transmitting filter 31 and a receiving filter 32; the transmission filter 31 is at least used for transmitting signals of a first frequency band and the second frequency band; the receiving filter 32 is at least used for receiving the signal of the first frequency band and/or the signal of the second frequency band; the movable end of the control switch 20 includes two contacts, and the two contacts are respectively connected to the transmitting filter 31 and the receiving filter 32.
For convenience of description, the two contacts are defined as a transmitting contact 21 and a receiving contact 22, respectively, wherein the transmitting contact 21 is used for connecting the transmitting filter 31, and the receiving contact 22 is used for connecting the receiving filter 32.
When the radio frequency circuit is currently in the working of the TDD frequency band, if the radio frequency circuit is receiving, the receiving contact 22 of the control switch 20 is controlled to be connected with the receiving filter 32, and the transmitting contact 21 is controlled to be disconnected; if the transmitter is transmitting, the transmitter contact 21 of the control switch 20 is connected to the transmitter filter 31, and the receiver contact 22 is controlled to be open.
When the radio frequency circuit is currently in operation in the FDD frequency band, the receive contact 22 of the control switch 20 is controlled to be connected to the receive filter 32, and the transmit contact 21 is controlled to be connected to the transmit filter 31.
Preferably, the control switch 20 is a double-Pole-multiple-Throw (DPxT) switch.
The double-pole multi-throw switch comprises an input end and two output ends, wherein one input end is connected with the antenna 10, and one of the two output ends is used for switching to a transmitting filter; the output end corresponding to the other knife is used for switching to the receiving filter; when the two cutters are closed at the same time, the circuits for receiving and transmitting can be controlled to be conducted at the same time, and the FDD frequency band is met.
Preferably, the first frequency Band is a Band 41 frequency Band, and the second frequency Band is an LTE Band 7 frequency Band.
The transmitting path of the LTE Band 7 (abbreviated as B7) may be configured as a transmitting path of the Band 41 (abbreviated as B41); the receiving path of B7 can be allocated with the receiving path of B41. When the radio frequency circuit works in a B41 frequency band and is in transmission of B41, one pole of the double-pole multi-throw switch is switched to a B41 transmission path, and the other pole is thrown in a disconnected state; when the reception is at B41, the aforementioned off-state pole is switched to the B41 reception path, and the other pole is thrown to the off-state. When the radio frequency circuit works in a B7 frequency band, one of the two-pole multi-throw switches is switched to a B41(B7) transmitting path, and the other switch is switched to a B41(B7) receiving path.
Preferably, the transmitting filter and the receiving filter of B41 should support the full bandwidth of 190MHz to ensure good signal and further ensure the performance of the mobile terminal.
For reference, the transmitting frequency range of the Band 41 frequency Band is 2496 MHz-2690 MHz, and the receiving frequency range of the Band 41 frequency Band is 2496 MHz-2690 MHz; the transmitting frequency range of the LTE Band 7 frequency Band is 2500 MHz-2570 MHz, and the receiving frequency range of the LTE Band 7 frequency Band is 2620 MHz-2690 MHz.
TABLE 1
Referring to table 1, the transmission frequency range of the Band 41 frequency Band is 2496MHz to 2690MHz, and the transmission frequency range of the LTE Band 7 frequency Band is 2500MHz to 2570MHz, and thus, the transmission frequency range of the Band 41 frequency Band includes the transmission frequency range of the LTE Band 7 frequency Band.
The receiving frequency range of the Band 41 frequency Band is 2496 MHz-2690 MHz, the receiving frequency range of the LTE Band 7 frequency Band is 2620 MHz-2690 MHz, and thus the receiving frequency range of the Band 41 frequency Band includes the receiving frequency range of the LTE Band 7 frequency Band.
The transmission and reception frequency band range of B41 completely encompasses the transmission and reception frequency band range of B7, so that the transmission filter and the reception filter of B41 band can also be used for transmission and reception signal transmission of B7 band, so that B7 can share the transmission and reception path of B41. The introduction of the DPxT switch can ensure that the two duplex frequency bands of B7 and B41 can work normally, and one B7 duplexer is reduced.
Preferably, the embodiment is applied to mobile terminal products, and can also be used for other wireless communication system electronic products supporting LTE B7 and B41 frequency bands.
Referring to fig. 1, the rf circuit preferably further includes a transceiver 70 connected to the signal transceiver device 30.
Wherein, the transceiver 70 is connected with the duplexer; alternatively, the transceiver 70 is connected to the transmission filter 31 and the reception filter 32, respectively.
Further, the radio frequency circuit further includes a power amplifier 60 connected between the transceiver 70 and the signal transmitting and receiving device 30.
The power amplifier 60 is connected between the transceiver 70 and the duplexer; or the power amplifier 60 is connected between the transceiver 70 and the transmission filter 31.
The antenna 10 receives signals of different communication frequency bands, the control switch 20 switches on corresponding receiving paths according to the communication frequency band to which the signals received by the antenna 10 belong, so that the transceiver 70 receives and processes the signals, the processed signals are amplified by the power amplifier 60, the control switch 20 switches on corresponding transmitting paths, and the amplified radio-frequency signals are output to the antenna 10 from corresponding channels.
In fig. 1, arrows on dotted lines indicate signal transmission and reception directions of the B7 frequency band; the arrows on the solid line indicate the signal transmission and reception directions of the B41 band.
Referring to fig. 2, in a typical design, the rf circuit at least includes a duplexer 40 and associated path matching device for B7 frequency band, and two filters 50 and associated path matching devices for B41 frequency band. For the control switch 20, one path corresponding to the output end can only realize signal transmission of one frequency band, so that the output end of the control switch 20 is more in demand; meanwhile, each frequency band corresponds to one transmission path, and the transmission path has one Power Amplifier (PA) 60, so that one PA 60 is only used for amplifying signals of one frequency band, and thus the output end of the PA 60 is more in demand.
Therefore, the present embodiment reduces a duplexer and related path matching devices for the B7 frequency band, and significantly reduces the cost. Meanwhile, the requirement on the output ends of the PAs is reduced, and one output end of the PA can meet the amplification of two frequency band signals; the requirement on the output end of the control switch 20 is also reduced, and one output end of the control switch 20 can meet the signal transmission of two frequency bands; meanwhile, the radio frequency front end design is more flexible and smooth on the limited PCB layout and routing area.
Example two
The embodiment provides a mobile terminal, which comprises the radio frequency circuit in the first embodiment.
The working principle of the radio frequency circuit in this embodiment is as follows: the radio frequency circuit works in a first frequency band at a certain period, and according to the signal received by the antenna 10, the active end of the control switch 20 is controlled to be connected with a corresponding device in the signal transmitting and receiving device 30, so as to realize the receiving and transmitting of the signal in the first frequency band; or, the radio frequency circuit works in a second frequency band at a certain time period, and according to the signal received by the antenna 10, the active end of the control switch 20 is controlled to be connected with a corresponding device in the signal transmitting and receiving device 30, so as to realize the receiving and transmitting of the signal in the second frequency band; or the radio frequency circuit does not work in any frequency band of the first frequency band and the second frequency band in a certain period of time, and the active end of the control switch 20 is controlled to be disconnected with the corresponding device in the signal transmitting and receiving device 30.
It should be noted that the signal transmitting and receiving device 30 includes many devices, and the devices are only used for transmitting and receiving signals in the first frequency band and/or signals in the second frequency band.
Since the frequency band range of the first frequency band includes the frequency band range of the second frequency band, the signal transmitting/receiving device 30 can also receive and transmit signals within the frequency band range of the second frequency band on the premise that the signals within the frequency band range of the first frequency band can be received and transmitted.
In a specific implementation process, the control switch 20 may be controlled to connect to a corresponding device according to which frequency band the antenna 10 is currently operating in.
As can be seen, in the embodiment, two groups of devices in the signal transmitting and receiving device 30 corresponding to the first frequency band and the second frequency band are reduced to one group, so that on one hand, the space occupied by the radio frequency circuit on the PCB is reduced, and the PCB is optimized, thereby ensuring the performance of the mobile terminal; on the other hand, the cost of a group of devices is reduced, meanwhile, the difficulty of complex processing caused by the increase of the devices is avoided, the processing cost is reduced, more importantly, the risk caused by the introduction of more new devices is avoided, and the reliability of the mobile terminal is further ensured.
Preferably, the mobile terminal may be any one of a Computer, such as a mobile phone and a tablet Computer, and a product combining Communication and consumer electronics (Computer, Communication and consumer electronics, abbreviated as 3C).
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The radio frequency circuit and the mobile terminal provided by the present invention are introduced in detail, and the principle and the implementation of the present invention are explained by using specific examples, and the explanation of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.
Claims (10)
1. A radio frequency circuit, comprising: the antenna, the control switch and the signal transmitting and receiving device;
the fixed end of the control switch is connected with the antenna, and the movable end of the control switch is connected with the signal transmitting and receiving device;
the signal transmitting and receiving device is at least used for transmitting signals of a first frequency band and signals of a second frequency band, and receiving the signals of the first frequency band and the signals of the second frequency band;
wherein the frequency range of the first frequency band comprises the frequency range of the second frequency band.
2. The radio frequency circuit according to claim 1, wherein the first frequency band and the second frequency band are both FDD frequency bands;
the signal transmitting and receiving device comprises a duplexer;
and the movable end of the control switch is connected with the duplexer.
3. The radio frequency circuit according to claim 1, wherein the first frequency band and the second frequency band are both TDD frequency bands;
the signal transmitting and receiving device comprises a transmitting filter and a receiving filter;
the transmission filter is at least used for transmitting the signals of the first frequency band and the signals of the second frequency band;
the receiving filter is at least used for receiving the signals of the first frequency band and the signals of the second frequency band;
and the movable end of the control switch is connected with the transmitting filter or the receiving filter.
4. The radio frequency circuit according to claim 1, wherein one of the first frequency band and the second frequency band is a TDD frequency band, and the other is an FDD frequency band;
the signal transmitting and receiving device comprises a transmitting filter and a receiving filter;
the transmission filter is at least used for transmitting the signals of the first frequency band and the signals of the second frequency band;
the receiving filter is at least used for receiving the signals of the first frequency band and the signals of the second frequency band;
the movable end of the control switch comprises two contacts which are respectively connected with the transmitting filter and the receiving filter correspondingly.
5. The RF circuit of claim 4, wherein the control switch is a double-pole, multiple-throw switch.
6. The RF circuit of claim 4, wherein the first Band is a Band 41 Band and the second Band is an LTE Band 7 Band.
7. The RF circuit of claim 6, wherein the transmission frequency Band of the Band 41 Band ranges from 2496MHz to 2690MHz, and the reception frequency Band of the Band 41 Band ranges from 2496MHz to 2690 MHz;
the transmitting frequency range of the LTE Band 7 frequency Band is 2500 MHz-2570 MHz, and the receiving frequency range of the LTE Band 7 frequency Band is 2620 MHz-2690 MHz.
8. The rf circuit of claim 1, further comprising a transceiver connected to the signal transceiver.
9. The radio frequency circuit according to claim 8, further comprising a power amplifier connected between the transceiver and the signal transmitting and receiving device.
10. A mobile terminal, characterized in that it comprises a radio frequency circuit according to any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821358610.9U CN209913813U (en) | 2018-08-22 | 2018-08-22 | Radio frequency circuit and mobile terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821358610.9U CN209913813U (en) | 2018-08-22 | 2018-08-22 | Radio frequency circuit and mobile terminal |
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| CN209913813U true CN209913813U (en) | 2020-01-07 |
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| CN201821358610.9U Active CN209913813U (en) | 2018-08-22 | 2018-08-22 | Radio frequency circuit and mobile terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111327343A (en) * | 2020-03-06 | 2020-06-23 | 惠州Tcl移动通信有限公司 | Common receiving channel radio frequency device, method and mobile terminal |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111327343A (en) * | 2020-03-06 | 2020-06-23 | 惠州Tcl移动通信有限公司 | Common receiving channel radio frequency device, method and mobile terminal |
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