CN106712795B

CN106712795B - Radio frequency circuit of LTE carrier aggregation technology and communication equipment thereof

Info

Publication number: CN106712795B
Application number: CN201510785389.XA
Authority: CN
Inventors: 顾江波; 潘光胜; 曾伟才; 张和平
Original assignee: Huawei Device Co Ltd
Current assignee: Huawei Device Co Ltd
Priority date: 2015-11-13
Filing date: 2015-11-13
Publication date: 2020-06-16
Anticipated expiration: 2035-11-13
Also published as: CN106712795A

Abstract

The invention discloses a radio frequency circuit of an LTE (Long term evolution) carrier aggregation technology and communication equipment thereof, wherein the radio frequency circuit comprises at least one LxM switch, a combiner and a 1 xN switch, and the switch logic of the LxM switch selects a radio frequency path connected with the combiner when the LxM switch is in a carrier aggregation mode; and when the non-carrier aggregation mode works, the combiner is bypassed through the L multiplied by M switch device and the 1 multiplied by N switch, so that the performance of the non-carrier aggregation mode is ensured. The invention adopts a novel radio frequency circuit of LTE carrier aggregation technology, effectively reduces circuit insertion loss caused by a communication terminal in a non-carrier aggregation working mode, simultaneously avoids the problem of large occupied space caused by a multi-antenna circuit, and enables the radio frequency circuit to meet more scene applications through flexible application of the LxM switch device.

Description

Radio frequency circuit of LTE carrier aggregation technology and communication equipment thereof

Technical Field

The invention relates to the field of communication, in particular to a radio frequency circuit of an LTE (Long term evolution) carrier aggregation technology and communication equipment thereof. .

Background

In the field of wireless communication technology, Long Term Evolution (LTE) is a Universal Mobile Telecommunications System (UMTS) technology standard established by the 3rd Generation Partnership Project (3 GPP) organization, and a carrier aggregation technology feature is added from rel.10, and the current protocol version of LTE has evolved to rel.12. According to preliminary statistics on the rel.13 version to be released, there are more than 40 LTE frequency bands, the frequency range is 450MHz-3800MHz, the Carrier Aggregation (CA) combination of 2 frequency band combined Carriers (2Inter-band Component Carriers, Inter-band 2CC) is over 50, and there are more than 40 carrier aggregation combinations of 3 frequency band combined Carriers (3Inter-band Component Carriers, Inter-band 3 CC). As new frequency bands and frequency spectrums are continuously proposed and released and global operators are continuously proposing more carrier aggregation frequency band combination demands, it is necessary to propose radio frequency circuits to adapt and support the demands.

Currently, two technical schemes are commonly adopted in the industry to realize flexible multi-band carrier aggregation combination, and one scheme is a three-band combiner scheme; another is to use a multiple antenna scheme.

If the scheme of the three-frequency combiner is adopted, the combination function of the multi-band carrier aggregation is completed by adopting a radio frequency circuit of the three-frequency combiner. Referring to fig. 1, in particular, a conventional radio frequency circuit using a triple-band combiner includes an antenna 11, a triple-band combiner 12, and three quadroplexers 13. The antenna 11 is connected with the three-frequency combiner 12, the three-frequency combiner 12 is connected with the three quadroplexers 13, the three quadroplexers 13 input radio-frequency signals of each frequency range, the radio-frequency signals enter the three-frequency combiner 12 to be combined, and the radio-frequency signals after being combined are transmitted through the antenna 11. However, the radio frequency circuit has the technical defects that in 1710MHz-2170MHz and 2300MHz-2690MHz of an LTE frequency band, the radio frequency circuit can only reluctantly realize the combination and radio frequency performance of 1710MHz-2170MHz and 2500MHz-2690MHz frequency bands, cannot simultaneously support 2300MHz-2400MHz frequency bands, and is limited in application; meanwhile, the circuit insertion loss is too large due to the multiple combination of signals on the circuit. That is, the existing radio frequency circuit adopting the three-frequency combiner has the problems that the rectangular coefficient is lower, and the combination of two narrow-band frequency bands at a narrow interval cannot be realized.

If a multi-antenna scheme is adopted, the carrier aggregation function is completed through a plurality of antennas covering different frequency bands. Referring to fig. 2, in detail, the conventional rf circuit using multiple antennas includes a first antenna 21, a second antenna 22, a combiner 23, two first quadplexers 24, and a second quadplexer 25. Wherein, the radio frequency signals with the Low frequency Band (LB) of 698MHz-960MHz frequency Band and the Mid frequency Band (Mid Band, MB) of 1710MHz-2170MHz frequency Band enter the combiner 23 through two first quadroplexers 24 respectively for frequency Band combining, and then are transmitted through the first antenna 21; the radio frequency signal with a High Band (HB) of 2300MHz to 2690MHz is directly communicated with the second antenna 22 via the second quadplexer 25, and then is transmitted via the second antenna 22. However, the dual-antenna structure using the first antenna 21 and the second antenna 22 has a high requirement for the installation space of the communication terminal using the rf circuit of the present embodiment, which is not in accordance with the trend of the current communication terminal to be thinner.

Disclosure of Invention

The invention mainly solves the technical problem of providing a radio frequency circuit of an LTE carrier aggregation technology and communication equipment thereof so as to reduce the insertion loss of a radio frequency channel and meet the manufacturing requirement of being lighter and thinner.

The invention provides a radio frequency circuit of an LTE carrier aggregation technology, which comprises at least one LxM switch, a combiner and a 1 xN switch; one end of the L multiplied by M switch comprises M paths of first radio frequency signal ends, and the other end of the L multiplied by M switch comprises L paths of second radio frequency signal ends; one end of the combiner comprises at least two third radio frequency signal ends, and the other end of the combiner is a fourth radio frequency signal end; one end of the 1 xN switch comprises at least two fifth radio frequency signal ends, and the other end of the 1 xN switch is a sixth radio frequency signal end; the combiner comprises a combiner, a first radio-frequency signal end, a second radio-frequency signal end, a third radio-frequency signal end, a fourth radio-frequency signal end, a fifth radio-frequency signal end, a fourth radio-frequency signal end, a sixth radio-frequency signal end and a fourth radio-frequency signal end, wherein L, M and N are more than or equal to two, one end of the L paths of second radio-frequency signal ends is connected with one third radio-frequency signal end of the combiner, the other end of the L paths of second radio-frequency signal ends is connected with one fifth radio-frequency signal end of the 1 xN switch, the fourth; the radio frequency circuit at least selectively works in a carrier aggregation mode and a non-carrier aggregation mode, when the radio frequency circuit works in the carrier aggregation mode, at least one end of M paths of first radio frequency signal ends of the L multiplied by M switch is connected with a sixth radio frequency signal end through one end of L paths of second radio frequency signal ends, a third radio frequency signal end of the combiner, a fourth radio frequency signal end and a fifth radio frequency signal end of the 1 multiplied by N switch in sequence, and the other end of the L paths of second radio frequency signal ends is not connected with the M paths of first radio frequency signal ends of the L multiplied by M switch; when the circuit works in the non-carrier aggregation mode, at least one of the M paths of first radio frequency signal ends of the L multiplied by M switch is connected with the sixth radio frequency signal end through one of the L paths of second radio frequency signal ends and one fifth radio frequency signal end of the 1 multiplied by N switch in sequence, and the other ends of the L paths of second radio frequency signal ends are not connected with the M paths of first radio frequency signal ends of the L multiplied by M switch.

With reference to the implementation manner of the first aspect, in a first possible implementation manner, when a frequency interval of radio frequency signals between at least two third radio frequency signal terminals of the combiner is not less than a first threshold, and the radio frequency circuit operates in a non-carrier aggregation mode, at least a part of frequencies of radio frequency signals passed by a fifth radio frequency signal terminal of the 1 × N switch are located in the frequency interval corresponding to the first threshold, where the first threshold is defined by an isolation value of the combiner.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner, the combiner includes three third radio frequency signal terminals, and frequency bands corresponding to the three third radio frequency signal terminals are: low Band LB: 698MHz-960MHz, Mid Band MB: 1710MHz-2170MHz and High Band HB: 2300MHz-2690 MHz.

With reference to the implementation manner of the first aspect, in a third possible implementation manner, the lxm switch is a multiple-input two-output cross selection switch.

With reference to the implementation manner of the first aspect, in a fourth possible implementation manner, the 1 × N switch is a single-pole-three-throw switch.

A second aspect provides a radio frequency circuit of another LTE carrier aggregation technology, including at least one lxm switch, a combiner, and a 1 × N switch; one end of the L multiplied by M switch comprises M paths of first radio frequency signal ends, and the other end of the L multiplied by M switch comprises L paths of second radio frequency signal ends; one end of the combiner comprises at least two third radio frequency signal ends, and the other end of the combiner is a fourth radio frequency signal end; one end of the 1 xN switch comprises at least two fifth radio frequency signal ends, and the other end of the 1 xN switch is a sixth radio frequency signal end; the radio frequency circuit at least selectively works in a carrier aggregation mode and a non-carrier aggregation mode, when the radio frequency circuit works in the carrier aggregation mode, at least one end of M paths of first radio frequency signal ends of the L multiplied by M switch sequentially passes through one end of L paths of second radio frequency signal ends, a third radio frequency signal end of the combiner, a fourth radio frequency signal end and a fifth radio frequency signal end of the 1 multiplied by N switch to realize signal communication with a sixth radio frequency signal, and the other end of the L paths of second radio frequency signal ends does not realize signal communication with the M paths of first radio frequency signal ends of the L multiplied by M switch; when the circuit works in a non-carrier aggregation mode, at least one of the M paths of first radio frequency signal ends of the L multiplied by M switch realizes signal communication with the sixth radio frequency signal end sequentially through one of the L paths of second radio frequency signal ends, one fifth radio frequency signal end of the 1 multiplied by N switch and the other ends of the L paths of second radio frequency signal ends do not realize signal communication with the M paths of first radio frequency signal ends of the L multiplied by M switch.

With reference to the implementation manner of the second aspect, in a first possible implementation manner, the combiner is a pilot frequency combiner, and includes a cavity resonator and a circulator, the cavity resonator is coupled to the third radio frequency signal terminal, and the circulator is coupled to the fourth radio frequency signal terminal and the cavity resonator, respectively.

With reference to the implementation manner of the second aspect, in a second possible implementation manner, the first threshold of the combiner is greater than or equal to 300MHz in the carrier aggregation mode.

With reference to the implementation manner of the second aspect, in a third possible implementation manner, the control Interface of the lxm switch is a Mobile Industry Processor Interface MIPI or a General Purpose Input Output GPIO.

A third aspect provides a communication device, including a signal processor, a back-end radio frequency circuit, a front-end radio frequency circuit, and an antenna, where the front-end radio frequency circuit is implemented in combination with the first aspect, or any one of the first to fourth aspects of the first aspect, or any one of the first to third possible implementations of the second aspect, and the sixth radio frequency signal terminal of the 1 × N switch in the front-end radio frequency circuit is connected to the antenna, and the signal processor is connected to the M first radio frequency signal terminals of the L × M switch in the front-end radio frequency circuit through the back-end radio frequency circuit.

The invention has the beneficial effects that: different from the situation of the prior art, the radio frequency circuit of the LTE carrier aggregation technology provided by the invention has the advantages that when the radio frequency circuit is in a carrier aggregation mode, the switch logic of the LxM switch selects the radio frequency path connected with the combiner; when the communication terminal works in the non-carrier aggregation mode, the combiner is bypassed through the L multiplied by M switch device and the 1 multiplied by N switch, and the insertion loss of a radio frequency channel is greatly reduced through selectively bypassing and accessing in two modes of carrier aggregation and non-carrier aggregation, so that the circuit insertion loss caused by the communication terminal in the non-carrier aggregation working mode is effectively reduced; the wireless communication performance of the communication terminal in weak signal is ensured, the required space size is reduced, and the manufacturing requirement of lighter and thinner is met; and thirdly, the bypass function of the LxM switch enriches the selection interval of the frequency band, and the required frequency band matching circuit can be flexibly added according to the actual situation, so that the application requirement of multiple scenes is met.

Drawings

Fig. 1 is a schematic diagram of a radio frequency architecture employing a three-frequency combiner scheme in the prior art;

fig. 2 is a schematic diagram of a radio frequency architecture employing a multiple antenna scheme in the prior art;

FIG. 3 is a schematic diagram illustrating a first embodiment of the RF circuit of the present invention, wherein the RF circuit is in a carrier aggregation mode;

FIG. 4 is a schematic diagram of a second embodiment of the RF circuit of the present invention, wherein the RF circuit is in a non-carrier aggregation mode;

FIG. 5 is a diagram illustrating the logic state mapping of the LxM switch of the RF circuit of the present invention;

FIG. 6 is a schematic diagram of an embodiment of a radio frequency circuit of the present invention;

FIG. 7 is a comparison diagram of insertion loss simulation of the RF path of FIG. 6 using the LxM switch with bypass and no bypass;

FIG. 8 is a schematic diagram of another embodiment of a radio frequency circuit of the present invention;

FIG. 9 is a schematic diagram of another embodiment of a radio frequency circuit of the present invention;

FIG. 10 is a schematic diagram of another embodiment of a radio frequency circuit of the present invention;

FIG. 11 is a schematic diagram of a further embodiment of a RF circuit according to the present invention;

FIG. 12 is a schematic diagram of another embodiment of the RF circuit of the present invention;

fig. 13 is a schematic diagram of an embodiment of a communication device of the present invention.

Detailed Description

Fig. 3 is a schematic diagram of a radio frequency circuit according to the first embodiment of the present invention. When the rf circuit of the present invention operates in the carrier aggregation mode, one end of the M first rf signal terminals D1 of the L × M switch 34 is connected to the sixth rf signal D6 through one end of the L second rf signal terminals D2, a third rf signal terminal D3 of the combiner 33, a fourth rf signal terminal D4, and a fifth rf signal terminal D5 of the 1 × N switch 4 in sequence, and the other end of the L second rf signal terminal D2 is not connected to the M first rf signal terminals D1 of the L × M switch 34, that is, the rf signal is transmitted through the P1 path in the figure. Specifically, before the radio frequency signal is transmitted through the P1 path, the radio frequency signal is input into the first radio frequency signal terminal D1 of the lxm switch 34, so that the radio frequency signal is output through the second radio frequency signal terminal D2 of the lxm switch 34, then the radio frequency signal is output through the third radio frequency signal terminal D3 of the combiner 33 and is combined by the combiner 33, and then the combined radio frequency signal is output through the fourth radio frequency signal terminal D4 of the combiner, and the output radio frequency signal is transmitted to the fifth radio frequency signal terminal D5 of the 1 × N switch 32 through the P1 path, and then transmitted to the antenna 31 through the sixth radio frequency signal terminal D6 of the 1 × N switch 32, and the radio frequency signal is transmitted by the antenna 31.

Fig. 4 is a schematic diagram of a radio frequency circuit according to a second embodiment of the present invention. When the rf circuit of the present invention operates in the non-carrier aggregation mode, at least one of the M first rf signal terminals D1 of the L × M switch 34 is sequentially connected to the sixth rf signal terminal D6 through one of the L second rf signal terminals D2 and one of the fifth rf signal terminals D5 of the 1 × N switch 32, and the other of the L second rf signal terminals D2 is not connected to the M first rf signal terminals D1 of the L × M switch 34, i.e., the rf signals are transmitted through the P2 path in the figure. Specifically, before the radio frequency signal is transmitted through the P2 path, the lxm switch 34 and the 1 × N switch 32 are set to bypass the combiner 33. Then, a radio frequency signal is input from the first radio frequency signal terminal D1 of the lxm switch 34, and the radio frequency signal is transmitted to the antenna 31 through the P2 path, so that the radio frequency signal is transmitted from the antenna 31. The difference from fig. 3 is that: fig. 4 is a schematic diagram illustrating an implementation principle of the rf circuit in the non-carrier aggregation mode, where the rf signal transmission path in fig. 3 is a P1 path, and the rf signal transmission path in fig. 4 is a P2 path.

With reference to fig. 3 and fig. 4, when the frequency interval of the radio frequency signals between the at least two third radio frequency signal terminals D3 of the combiner 33 is not less than the first threshold, and the radio frequency circuit operates in the non-carrier aggregation mode, at least part of the frequencies of the radio frequency signals passed by the fifth radio frequency signal terminal D5 of the 1 × N switch 32 are located in the frequency interval corresponding to the first threshold, where the first threshold is defined by the isolation value of the combiner 33, so as to reduce the insertion loss between the frequency bands. Further, the combiner 33 here includes three third rf signal terminals, and the corresponding frequency bands are: low Band (LB): 698MHz-960MHz, Mid Band (MB): 1710MHz-2170MHz and High Band (HB): 2300MHz-2690MHz, and multi-band coverage is realized. The LxM switch and the control logic of the LxM switch select to use a Mobile Industry Processor Interface (MIPI) for control according to the port support quantity and the actual realization requirement of the device. The combiner 33 here is a three-frequency combiner, and combines the frequency bands corresponding to the three third radio frequency signal terminals D3. Here, the lxm switch is a multiple-input two-output cross select switch; the combiner is a three-frequency combiner; the 1 xn switch is a single pole, triple throw switch.

Fig. 5 is a schematic diagram illustrating a logic state corresponding relationship of an application example of the lxm switch of the rf circuit of the present invention. The L multiplied by M switch is a six-in two-out cross selection switch, and when the logic state of the L multiplied by M switch is 0xx0, the TRx _1 end is communicated with the ANT _ A end; when the logic state is 0xx1, the TRx _2 end of the LxM switch is communicated with the ANT _ A end; when the logic state is 1xx0, the TRx _1 end of the LxM switch is communicated with the ANT _ B end, and so on.

With reference to fig. 3, 4 and 5, an embodiment of the radio frequency circuit of the LTE carrier aggregation technology of the present invention includes at least one lxm switch 34, a combiner 33 and a 1 × N switch 32; one end of the L × M switch 34 includes M first RF signal terminals D1, and the other end includes L second RF signal terminals D2; one end of the combiner 33 comprises at least two third radio frequency signal ends D3, and the other end is a fourth radio frequency signal end D4; one end of the 1 × N switch 32 includes at least two fifth rf signal terminals D5, and the other end is a sixth rf signal terminal D6;

wherein, L, M, and N are greater than or equal to two, one end of the L-path second rf signal terminal D2 is connected to a third rf signal terminal D3 of the combiner 33, the other end of the L-path second rf signal terminal D2 is connected to a fifth rf signal terminal D5 of the 1 × N switch 32, a fourth rf signal terminal D4 of the combiner 33 is connected to another fifth rf signal terminal D5 of the 1 × N switch 32, and a sixth rf signal terminal D6 of the 1 × N switch 32 is used for connecting the antenna 31; meanwhile, the radio frequency circuit of the present invention selectively operates in at least a carrier aggregation mode and a non-carrier aggregation mode, when operating in the carrier aggregation mode, at least one of the M first radio frequency signal terminals D1 of the L × M switch 34 is connected to the sixth radio frequency signal terminal D6 through one of the L second radio frequency signal terminals D2, one of the third radio frequency signal terminals D3 of the combiner 33, the fourth radio frequency signal terminal D4, and one of the fifth radio frequency signal terminals D5 of the 1 × N switch 32 in sequence, and the other terminals of the L second radio frequency signal terminals D2 are not connected to the M first radio frequency signal terminals D1 of the L × M switch 34; when the mobile station operates in the non-carrier aggregation mode, at least one of the M first rf signal terminals D1 of the L × M switch 34 is sequentially connected to the sixth rf signal terminal D6 through one of the L second rf signal terminals D2 and one fifth rf signal terminal D5 of the 1 × N switch 32, and the other terminal of the L second rf signal terminal D2 is not connected to the M first rf signal terminals D1 of the L × M switch 34. The combiner 33 is used for combining two or more radio frequency signals with different frequency bands into one path and sending the path to a radio frequency device for antenna transmission, and meanwhile, mutual influence among signals of various ports is avoided; 1 XN switch to realize switching function.

Fig. 6 is a schematic structural diagram of an embodiment of the rf circuit of the present invention. Wherein, specifically include: a single-pole multi-throw switch 35, two multi-input two-output cross selection switches 34, a triple-frequency combiner 33, a single-pole three-throw switch 32, and an antenna 31. When the radio frequency circuit of the first embodiment operates in the B3(Band 3, 1710MHz-1785MHz, which belongs to the middle frequency Band) and B7(Band 7, 2500MHz-2570MHz, which belongs to the high frequency Band) carrier aggregation modes, the multiple-input two-output cross selection switch 34 of the high frequency Band corresponding to B7 selects the P2 path here as the radio frequency signal output path through logic control; the multiple-input-two-output cross selection switch 34 of the middle frequency band corresponding to the B3 selects the P3 path as a radio frequency signal output path through logic control; the single pole, triple throw switch 32 here will also select the P6 path here accordingly as the rf signal output path. Since the operating condition of the carrier aggregation mode is generally established under a strong base station network signal, a certain radio frequency performance backoff has a small impact on the service, and is also allowed in the 3rd Generation partnership project (3 GPP) protocol.

In the non-carrier aggregation mode of B7, the mimo crossbar switch 34 selects the P1 path as the rf output path through logic control, and the corresponding single-pole-three-throw switch 32 also selects the P1 path as the rf output path. The operating mode under the condition has lower path insertion loss and better wireless performance, so that the coverage and use experience performance of the device using the radio frequency circuit of the first embodiment on weak signals can be ensured.

Referring to fig. 7, a schematic diagram of a simulation of insertion loss of a radio frequency channel under a bypass and a non-bypass by using an L × M switch according to an embodiment of the present invention is shown, and it can be seen through comparison that after a bypass function of a multi-way cross selection switch is used, the insertion loss of the whole radio frequency circuit in a middle frequency band and a high frequency band is relatively reduced to about 1.0dB, that is, the insertion loss of the radio frequency channel is significantly reduced by using the multi-way cross switch, that is, the bypass function of the L × M switch is used, and the gain is very significant.

Fig. 8 is a schematic structural diagram of another embodiment of the rf circuit of the present invention. The difference from the specific structure in fig. 6 is that: the L × M switch of the middle frequency band is changed to the single-pole multi-throw switch 45, and the 1 × N switch is changed to the single-pole double-throw switch 42, when in the non-carrier aggregation mode of the high frequency band, the multiple-input two-output cross selection switch 44 selects the P1 path as the radio frequency output path through logic control, and the single-pole double-throw switch 45 correspondingly selects the P1 path as the radio frequency signal output path.

Fig. 9 is a schematic structural diagram of a radio frequency circuit according to another embodiment of the present invention. The difference from the specific structure in fig. 6 and 8 lies in that: the low frequency Band, the middle frequency Band and the high frequency Band all adopt a multi-input two-output cross selection switch 54, when the radio frequency circuit works in a carrier aggregation mode of a frequency Band B5(Band 5, 824MHz-894MHz, which belongs to the low frequency Band) and a frequency Band B10(Band 10, 1710MHz-2170MHz, which belongs to the middle frequency Band), the multi-input two-output cross selection switch 54 of the middle frequency Band corresponding to the frequency Band B10 selects a P3 path through logic control; the low-band multiple-input-two-output cross selection switch 54 corresponding to the B5 frequency band selects the P5 path as a radio frequency signal output path through logic control; the single-pole four-throw switch 52 selects the P7 path as the rf output path accordingly, by combining with the combiner 53. When the rf circuit operates in the non-carrier aggregation mode of the B5 band, the multiple-input two-output selection switch 54 of the LB band selects the P6 path as the rf signal output path through logic control, and the single-pole four-throw switch 52 also correspondingly selects the P6 path as the rf signal output path.

Fig. 10 is a schematic structural diagram of a radio frequency circuit according to another embodiment of the present invention. The difference from the specific structure in fig. 6, 8 and 9 lies in that: a multiple-input two-output cross selection switch 64 with a high frequency band of 2200MHz-3800MHz is adopted, and a HB2 is added to the input end of the multiple-input two-output cross selection switch 64: the 2300MHz-2400MHz frequency Band is corresponding to the B30(Band 30, 2305MHz-2315MHz) and the B40(Band 40, 2300MHz-2400MHz) frequency Band, correspondingly, when the radio frequency circuit is in a non-carrier aggregation mode of the B30 frequency Band and the B40 frequency Band, the multiple-input two-output cross selection switch 64 of the high frequency Band selects a P1 path as a radio frequency signal output path through logic control, and the single-pole three-throw switch 62 selects a HB2 frequency Band of the corresponding P1 path as an output frequency Band of the antenna, so that the support for the B30 frequency Band and the B40 frequency Band is realized.

Fig. 11 is a schematic structural diagram of a radio frequency circuit according to another embodiment of the present invention. The specific structure difference from fig. 6, 8, 9 and 10 lies in that: a double-antenna structure is adopted, wherein a first antenna 71 is shared after low-frequency 692MHz-960MHz and high-frequency 2300MHz-3800MHz are combined by a double-frequency combiner 75, and a second antenna 72 is used in the middle-frequency 1710MHz-2170 MHz. The condition of adopting double antennas is that the size of the communication terminal adopting the radio frequency circuit is not limited mostly, and better communication experience can be realized by adopting a multi-antenna structure.

Fig. 12 is a schematic diagram of a radio frequency circuit according to another embodiment of the present invention. Wherein, it comprises at least one lxm switch 84, a combiner 83 and a 1 xn switch 82; one end of the L × M switch 84 includes M first RF signal terminals D1, and the other end includes L second RF signal terminals D2; one end of the combiner 83 includes at least two third rf signal terminals D3, and the other end is a fourth rf signal terminal D4; one end of the 1 × N switch 82 includes at least two fifth rf signal terminals D5, and the other end is a sixth rf signal terminal D6;

when the radio frequency circuit works in the carrier aggregation mode, at least one of the M paths of first radio frequency signal terminals D1 of the lxm switch 84 sequentially passes through one of the L paths of second radio frequency signal terminals D2, one third radio frequency signal terminal D3 of the combiner 83, the fourth radio frequency signal terminal D4, and one fifth radio frequency signal terminal D5 of the 1 × N switch to realize signal communication with the sixth radio frequency signal terminal D6, and the other terminals of the L paths of second radio frequency signal terminals D2 do not realize signal communication with the M paths of first radio frequency signal terminals D1 of the lxm switch 84;

when the mobile station operates in the non-carrier aggregation mode, at least one of the M first rf signal terminals D1 of the L × M switch 84 sequentially implements signal communication with the sixth rf signal terminal D6 through one of the L second rf signal terminals D2, and one of the fifth rf signal terminals D5 of the 1 × N switch 82, and the other terminal of the L second rf signal terminal D2 does not implement signal communication with the M first rf signal terminals D1 of the L × M switch 84. The difference from the first embodiment is that the radio frequency circuit of the second embodiment uses digital circuits, and realizes control and transmission through signal communication.

Further, the combiner 83 is a pilot frequency combiner, and includes a cavity resonator and a circulator, the cavity resonator is coupled to the third rf signal D3, and the circulator is coupled to the fourth rf signal D4 and the cavity resonator, respectively. The pilot frequency combiner synthesizes the signals with different frequencies into one path of signal containing signal components with different frequencies, thereby avoiding the mutual influence among all radio frequency signal ends. In addition, the combiner 83 has the first threshold equal to or greater than 300MHz in the carrier aggregation mode.

Fig. 13 is a schematic diagram of a communication device according to an embodiment of the present invention. The wireless communication system comprises a signal processor 91, a back-end radio frequency circuit 92, a front-end radio frequency circuit 93 and an antenna 94, wherein the front-end radio frequency circuit 93 can adopt any radio frequency circuit of the LTE carrier aggregation technology, a sixth radio frequency signal terminal D6 of a 1 × N switch in the front-end radio frequency circuit is connected with the antenna 94, and the signal processor 91 is connected with M first radio frequency signal terminals D1 of an L × M switch in the front-end radio frequency circuit 93 through the back-end radio frequency circuit 92.

In addition, the lxm switch in each embodiment of the present invention may be a multiple-input two-output cross selection switch, or a multiple-input multiple-output cross selection switch; the combiner can be a three-frequency combiner or a multi-frequency combiner; the 1 xN switch can be a single-pole double-throw switch or a single-pole multi-throw switch. The LXM switch control can select to use a Mobile Industry Processor Interface (MIPI) or a General Purpose input output Interface (GPIO).

In summary, the radio frequency circuit of the LTE carrier aggregation technology provided by the present invention includes: the circuit comprises at least one LxM switch, a combiner and a 1 xN switch, wherein the bypass function of the LxM switch is adopted, and the selective bypass and the passage are adopted in two modes of carrier aggregation and non-carrier aggregation, so that the insertion loss of a radio frequency channel is greatly reduced, the wireless communication performance of a communication terminal using the radio frequency circuit is ensured when the signal is weak, and the user experience is improved; secondly, the radio frequency signal only needs to be transmitted and received through one antenna, so that the required space size is reduced, and the manufacturing requirement of lighter weight is met; and thirdly, the bypass function of the LxM switch enriches the selection interval of the frequency band, and the required frequency band matching circuit can be flexibly added according to the actual situation, thereby realizing the application requirement of multiple scenes. The radio frequency circuit of the scheme is suitable for mobile terminal design of communication systems such as 2G, 3G, 4G and the like, and the product form is suitable for but not limited to mobile phones, internet access cards, portable computers, Wireless local area network (WiFi) signal equipment, data cards and the like.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A radio frequency circuit of LTE carrier aggregation technique characterized in that:

the circuit comprises at least two LxM switches, a combiner and at least two 1 xN switches;

the at least two L M switches comprise a first L M switch and a second L M switch, and the at least two 1N switches comprise a first 1N switch and a second 1N switch;

one end of the first LxM switch comprises a first M-path first radio frequency signal end, and the other end of the first LxM switch comprises a first L-path second radio frequency signal end;

one end of the combiner comprises at least two third radio frequency signal ends, and the other end of the combiner is a fourth radio frequency signal end;

one end of the first 1 xN switch comprises at least two fifth radio frequency signal ends, and the other end of the first 1 xN switch is a sixth radio frequency signal end;

wherein, the L, M, and N are greater than or equal to two, one end of the first L-path second radio frequency signal terminal is connected to one of the third radio frequency signal terminals of the combiner, the other end of the first L-path second radio frequency signal terminal is connected to one of the fifth radio frequency signal terminals of the first 1 × N switch, the fourth radio frequency signal terminal of the combiner is connected to the other of the fifth radio frequency signal terminals of the first 1 × N switch, and the sixth radio frequency signal terminal of the first 1 × N switch is used for connecting a first antenna;

one end of the second LxM switch comprises a second M paths of first radio frequency signal ends, and the other end of the second LxM switch comprises a second L paths of second radio frequency signal ends;

one end of the second 1 xN switch comprises at least one third radio frequency signal end, and the other end of the second 1 xN switch is a fourth radio frequency signal end;

one end of the second L-path second rf signal terminal is connected to the third rf signal terminal of the second 1 × N switch, and the fourth rf signal terminal of the second 1 × N switch is used to connect to a second antenna;

the radio frequency circuit at least selectively operates in a carrier aggregation mode and a non-carrier aggregation mode, when operating in the carrier aggregation mode, at least one of the M first radio frequency signal terminals of the first lxm switch is connected to the sixth radio frequency signal terminal sequentially via one of the L second radio frequency signal terminals, one of the third radio frequency signal terminal, the fourth radio frequency signal terminal of the combiner, and one of the fifth radio frequency signal terminal of the first 1 × N switch, and the other of the L second radio frequency signal terminals is not connected to the M first radio frequency signal terminals of the first lxm switch;

when the mobile terminal operates in the non-carrier aggregation mode, at least one of the first M first rf signal terminals of the first lxm switch is sequentially connected to the sixth rf signal terminal through one of the first L second rf signal terminals and one of the fifth rf signal terminals of the first 1 × N switch, and the other of the first L second rf signal terminals is not connected to the first M first rf signal terminals of the first lxm switch;

when the radio frequency circuit operates in the non-carrier aggregation mode, at least part of frequencies of radio frequency signals passed by the fifth radio frequency signal terminal of the first 1 × N switch are within a frequency interval corresponding to a first threshold, where the first threshold is defined by an isolation value of the combiner;

at least two of the third radio frequency signal terminals of the combiner have corresponding frequency bands respectively: low band Low BandLB: 698MHz-960MHz and High Band HB: 2300MHz-2690 MHz; the frequency Band corresponding to the third radio frequency signal end of the second 1 × N switch is Mid Band MB: 1710MHz to 2170 MHz.

2. The radio frequency circuit as recited in claim 1, wherein:

the L multiplied by M switch is a multiple-input two-output cross selection switch.

3. The radio frequency circuit as recited in claim 1, wherein:

the 1 XN switch is a single-pole triple-throw switch.

4. A radio frequency circuit of LTE carrier aggregation technique characterized in that:

one end of a second L-path second radio frequency signal end of the second lxm switch is connected to the third radio frequency signal end of the second 1 × N switch, and the fourth radio frequency signal end of the second 1 × N switch is used for connecting a second antenna;

the radio frequency circuit at least selectively operates in a carrier aggregation mode and a non-carrier aggregation mode, when operating in the carrier aggregation mode, at least one of the M first radio frequency signal terminals of the first lxm switch sequentially passes through one of the L second radio frequency signal terminals of the first lxm switch, one of the third radio frequency signal terminals of the combiner, the fourth radio frequency signal terminal, and one of the fifth radio frequency signal terminals of the first 1 × N switch to implement signal communication with the sixth radio frequency signal, and the other of the L second radio frequency signal terminals of the first lxm switch does not implement signal communication with the M first radio frequency signal terminals of the first lxm switch;

when the mobile terminal operates in the non-carrier aggregation mode, at least one of the first M first rf signal terminals of the first lxm switch sequentially implements signal communication with the sixth rf signal terminal through one of the first L second rf signal terminals of the first lxm switch, one of the fifth rf signal terminals of the 1 × N switch, and the other of the first L second rf signal terminals does not implement signal communication with the first M first rf signal terminals of the first lxm switch;

5. The radio frequency circuit of claim 4, wherein:

the combiner is a pilot frequency combiner and comprises a cavity resonator and a circulator, the cavity resonator is coupled with the third radio frequency signal end, and the circulator is coupled with the fourth radio frequency signal end and the cavity resonator respectively.

6. The radio frequency circuit of claim 4, wherein:

the first threshold is greater than or equal to 300MHz corresponding to a carrier aggregation mode.

7. The radio frequency circuit of claim 4, wherein:

the control interface of the L multiplied by M switch is a Mobile Industry processor interface (Mobile Industry processor interface) MIPI or a General Input Output (Input Output) GPIO (General Input Output) interface.

8. A communication device, characterized by:

the wireless communication device comprises a signal processor, a back-end radio frequency circuit, a front-end radio frequency circuit and an antenna, wherein the front-end radio frequency circuit is the radio frequency circuit as claimed in any one of claims 1 to 7, a sixth radio frequency signal terminal of the first 1 × N switch in the front-end radio frequency circuit is connected with the antenna, and the signal processor is connected with M first radio frequency signal terminals of the L × M switch in the front-end radio frequency circuit through the back-end radio frequency circuit.