Radio frequency system and communication equipment

Abstract

The invention relates to a radio frequency system and communication equipment, which comprises first filtering modules, second filtering modules, a frequency division module and a radio frequency processing module, and is characterized in that the frequency division module is connected with an antenna and at least one second filtering module, and is connected to any first filtering module in the plurality of first filtering modules in a switchable conduction manner; the radio frequency processing module is connected with the first filtering module and the second filtering module. Multiple paths of preset frequency band signals can be obtained through frequency division processing by the frequency division module, and any one of the first filtering module and the second filtering module can filter the received preset frequency band signals to obtain a target frequency band signal of one sub-frequency band or target frequency band signals of two sub-frequency bands. According to the embodiment of the invention, the first filtering module and the second filtering module can respectively adopt a single-input and single-output filter or a single-input and double-output filter with relatively low price, so that the cost can be reduced.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to a radio frequency system and communication equipment. Background Art

[0002] With the development of radio frequency technology, the application scope of carrier aggregation CA communication is becoming wider and wider. However, the combination of CA in multiple frequency bands requires more multiplexers for filtering, which is not conducive to reducing the cost of radio frequency systems. Summary of the invention

[0003] The embodiments of the present application provide a radio frequency system and a communication device, which can reduce costs on the basis of realizing multi-CA combined communication.

[0004] A first aspect of the present application provides a radio frequency system, including:

[0005] A plurality of first filtering modules and at least one second filtering module, each filtering module is used to support filtering processing of a received preset frequency band signal to output a target frequency band signal, wherein the target frequency band signal includes a sub-band signal or two sub-band signals of the preset frequency band signal;

[0006] A frequency division module is configured with a first end and a plurality of second ends, wherein the first end is used to receive a carrier aggregation signal from an antenna, and one of the second ends is switchably connected to any first filter module among the plurality of first filter modules, and at least another second end is respectively connected to the at least one second filter module, and the frequency division module is used to support frequency division processing of the carrier aggregation signal, and output corresponding preset frequency band signals to any first filter module and the at least one second filter module respectively;

[0007] The radio frequency processing module is connected to the plurality of first filter modules and the at least one second filter module respectively, and is used to support reception processing of each of the target frequency band signals from any of the first filter modules and the at least one second filter module.

[0008] A second aspect of the present application provides a communication device, including:

[0009] A radio frequency system as described above.

[0010] The above-mentioned radio frequency system and communication equipment include a first filter module, a second filter module, a frequency division module and a radio frequency processing module. The frequency division module is respectively connected to the antenna and at least one second filter module, and can be switchably connected to any first filter module among the multiple first filter modules. The radio frequency processing module is respectively connected to the first filter module and the second filter module. Through the frequency division module, multiple preset frequency band signals can be obtained by frequency division processing, and output to any first filter module and the second filter module respectively. Any first filter module and the second filter module can respectively filter the received preset frequency band signal to obtain a target frequency band signal of a sub-band or a target frequency band signal of two sub-bands, so that the radio frequency processing module can receive and process multiple target frequency band signals. Therefore, the first filter module and the second filter module in this embodiment can respectively adopt a relatively cheap single-input single-output filter, or a single-input dual-output filter, which is conducive to reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 One of the structural block diagrams of a radio frequency system according to an embodiment;

[0013] Figure 2 It is a structural block diagram of a radio frequency system in the related art;

[0014] Figure 3 This is a second structural block diagram of a radio frequency system according to an embodiment;

[0015] Figure 4 This is one of the circuit diagrams of a frequency division module according to an embodiment;

[0016] Figure 5 For an embodiment Figure 4 The corresponding simulation curve diagram of the frequency division module;

[0017] Figure 6 The second circuit diagram of the frequency division module of an embodiment;

[0018] Figure 7 For an embodiment Figure 6 The corresponding simulation curve diagram of the frequency division module;

[0019] Figure 8 The third circuit diagram of the frequency division module of an embodiment;

[0020] Fig. 9 For an embodiment Figure 8 The corresponding simulation curve diagram of the frequency division module;

[0021] Fig.10 The third structural block diagram of a radio frequency system according to an embodiment;

[0022] Fig.11 is a structural block diagram of a radio frequency processing module according to an embodiment;

[0023] Fig.12 This is a fourth structural block diagram of a radio frequency system according to an embodiment;

[0024] Fig.13 This is a fifth structural block diagram of a radio frequency system according to an embodiment;

[0025] Fig.14 This is a sixth structural block diagram of a radio frequency system according to an embodiment;

[0026] Fig.15 This is a seventh structural block diagram of a radio frequency system according to an embodiment;

[0027] Fig.16 It is a structural block diagram of a communication device in one embodiment. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0029] It is understood that the terms "first", "second", etc. used in this application can be used to describe various elements in this article, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to another element or there may be a centering element at the same time.

[0030] The radio frequency system involved in the embodiment of the present application can be applied to a communication device with a wireless communication function, and the communication device can be a handheld device, a vehicle-mounted device, a smart car, a wearable device, a computing device or other processing device connected to a wireless modem, as well as various forms of user equipment (UE) (e.g., a mobile phone), a mobile station (MS), etc. For the convenience of description, the above-mentioned devices are collectively referred to as communication devices.

[0031] The communication device can support carrier aggregation (CA) technology with multiple frequency band combinations. CA technology can aggregate 2-5 component carriers (CC) together, thereby effectively widening the transmission bandwidth of the signal receiving path and improving the signal transmission rate. Among them, downlink carrier aggregation refers to the transmission method in which the base station sends a carrier aggregation signal to the communication device. After receiving the downlink carrier aggregation signal, based on the hardware structure in the radio frequency system involved in this embodiment, the communication device can extract the downlink carrier aggregation signal to realize the reception and processing of the signals of each component carrier frequency band.

[0032] Figure 1 This is one of the structural block diagrams of a radio frequency system according to an embodiment, referring to Figure 1 In this embodiment, the radio frequency system includes a first filtering module 10 , a second filtering module 20 , a frequency division module 30 and a radio frequency processing module 40 .

[0033] A plurality of first filter modules 10 and at least one second filter module 20 ( Figure 1 Only one first filter module 10 and a second filter module 20 are shown, and only the connection state of the first filter module 10 being conductively connected to the frequency division module 30 is shown). Each filter module is respectively used to support filtering processing of the received preset frequency band signal to output a target frequency band signal, and the target frequency band signal includes a sub-band signal or two sub-band signals of the preset frequency band signal; the frequency division module 30 is configured with a first end and multiple second ends, the first end is used to receive the carrier aggregation signal from the antenna, and a second end can be switchably conductively connected to any first filter module 10 among the multiple first filter modules 10, and at least another second end is respectively connected to at least one second filter module 20. The frequency division module 30 is used to support frequency division processing of the carrier aggregation signal, and output different preset frequency band signals to any first filter module 10 and at least one second filter module 20 respectively; the RF processing module 40 is respectively connected to the multiple first filter modules 10 and at least one second filter module 20, and is used to support receiving and processing of each target frequency band signal from any first filter module 10 and at least one second filter module 20.

[0034] The frequency division module 30 is connected to the antenna and at least one second filter module 20 respectively, and can be switched to be connected to any first filter module 10 of the plurality of first filter modules 10. The frequency division module 30 is used to perform frequency division processing on the carrier aggregation signal from the antenna, and each channel only allows the preset frequency band signal to pass through, so as to extract multiple preset frequency band signals, and output the multiple preset frequency band signals to any first filter module 10 and each second filter module 20 respectively. Each filter module is used to filter the preset frequency band signal when receiving a preset frequency band signal corresponding to each other, and only allow the target frequency band signal to pass through, so as to obtain the target frequency band signal. The RF processing module 40 is connected to the plurality of first filter modules 10 and at least one second filter module 20 respectively, so as to receive the target frequency band signal output by any first filter module 10 and each second filter module 20, receive and process each target frequency band signal, and transmit each received and processed RF signal to the RF transceiver for demodulation by the RF transceiver. Therefore, the frequency division module 30, any one of the first filtering modules 10, each of the second filtering modules 20 and the RF processing module 40 can support processing the carrier aggregation signal from the antenna to obtain multiple target frequency band signals corresponding to the carrier aggregation signal.

[0035] Among them, the target frequency band signal includes a sub-band signal or two sub-band signals of the corresponding preset frequency band signal, which can be understood as the first filtering module 10 and the second filtering module 20 can filter the received preset frequency band signal to obtain a sub-band signal or two sub-band signals of the preset frequency band signal. Therefore, the first filtering module 10 and the second filtering module 20 are filtering modules with single-end input and single-end output or single-end input and double-end output, respectively, which can correspond to sampling single-input and single-output filters, or single-input and double-output filters, avoiding the introduction of single-input and multiple-output (greater than double output) filters. On the one hand, the price of single-input and single-output filters, or single-input and double-output filters is cheaper than other types of filters, which can reduce costs. On the other hand, the frequency division module 30 generally includes an impedance path, which is usually composed of inductors and capacitors. The price is low and the cost is almost negligible, which can further reduce costs.

[0036] It can be understood that the multiple preset frequency band signals output by the frequency division module 30 can be the same or different, and the frequency division module 30 can be configured according to the CA combination requirements; similarly, the target frequency band signals output by multiple first filtering modules 10 can be the same or different, and the different target frequency band signals of the multiple first filtering modules 10 are all sub-band signals of the preset frequency band signal; when there are multiple second filtering modules 20, the target frequency band signals output by the multiple second filtering modules 20 can be the same or different.

[0037] Among them, the carrier aggregation signal can be a 2G, 3G, 4G, 5G signal, etc., and the combined frequency band of the carrier aggregation signal can include a combination of multiple different preset frequency bands, for example, low frequency + medium frequency, low frequency + high frequency, medium frequency + high frequency, low frequency + medium frequency + high frequency, low frequency + medium frequency + high frequency + ultra-high frequency, etc., and examples are not introduced one by one here. Each preset frequency band may include one or more sub-frequency bands.

[0038] Taking the 4G signal as an example, if the downlink carrier aggregation signal is a medium frequency + high frequency carrier aggregation signal, the frequency division module 30 can obtain two signals through frequency division processing, one is a medium frequency signal, and the other is a high frequency signal. The medium frequency signal is input to the filter path where the multiple first filter modules 10 are located and filtered by any of the first filter modules 10, and the high frequency signal is input to the filter path where the second filter module 20 is located to be filtered by the second filter module 20. Further, taking the example that the medium frequency signal includes B1+B3+B34+B39 radio frequency signals and the high frequency signal includes B41 radio frequency signals, the target frequency band obtained after further filtering processing by any of the first filter modules 10 may include any one of B1, B3, B34, and B39, or include two frequency bands with close center frequencies, such as B1, B3 or B34, B39; the target frequency band obtained after further filtering processing by the second filter module 20 may include B41. Therefore, through the frequency division module 30, the single-output or dual-output first filter module 10 and the second filter module 20, the 2CA combination communication of any one of B1, B3, B34, B39 and B41, the 3CA combination communication of B1, B3 and B41, and the 3CA combination communication of B34, B39 and B41 can be realized, which is conducive to reducing costs.

[0039] It can be understood that the above shows an embodiment in which the frequency division module 30 outputs different preset frequency band signals after frequency division processing. For example, the frequency division module 30 outputs one intermediate frequency signal and one high frequency signal. In other embodiments, the frequency division module 30 can also be configured to output at least two signals of the same preset frequency band, such as two intermediate frequency signals, one of which is filtered through the switchably connected first filter module 10, and the other intermediate frequency signal is filtered through the second filter module 20 directly connected to the frequency division module 30. For example, taking the intermediate frequency signal including B1+B3+B34+B39 radio frequency signal as an example, the target frequency band obtained after further filtering processing by any first filter module 10 may include any one of B1, B3, B34, B39, or two frequency bands with close center frequencies, such as B1, B3 or B34, B39; the target frequency band obtained after further filtering processing by the second filter module 20 may also include any one of B1, B3, B34, B39, or B1, B3 or B34, B39. Therefore, through the frequency division module 30, the single-output or dual-output first filter module 10 and the second filter module 20, 2CA combined communication, 3CA combined communication and even 4CA combined communication of at least two frequency bands among B1, B3, B34 and B39 can be realized (for example, one first filter module 10 outputs B1, and three second filter modules 20 respectively output B3, B34 and B39), which is conducive to reducing costs.

[0040] It can be understood that the above shows an embodiment in which the frequency division module 30 outputs two preset frequency band signals after frequency division processing. In other embodiments, the frequency division module 30 can also be configured to output more than two preset frequency band signals. The number of frequency division channels of the frequency division module 30 can be set according to actual needs, and no further limitation is made to this.

[0041] In the related technology, in order to realize multi-CA combined communication, a combination architecture of multiple multiplexers is required to process the carrier aggregation signal from the antenna to obtain multiple target frequency band signals. For example, in the related technology 1 that requires a 2CA requirement of combining two of the three frequency bands B1+B3+B7, at least two triplexers are required to be matched to achieve it; for example, in the related technology 2 that requires the 3CA combination requirements of B1+B3+B41 and B34+B39+B41, at least one SP4T switch, one duplexer and one triplexer are required to be matched to achieve it.

[0042] Taking related technology 2 as an example, Figure 2As shown, the system must set up an SP4T switch to switch between the B1+3+41 downlink CA combination and the B34+39+41 downlink CA combination. When the system needs to support the B1+3+41 downlink CA, the carrier aggregation signal passes through the SP4T switch and then enters the triplexer, and then enters the receiving circuit in three ways, and finally enters the RF transceiver for demodulation; when the system needs to support the B34+39+41 downlink CA, the carrier aggregation signal passes through the SP4T switch and then enters the duplexer, and enters the receiving circuit in two ways, and finally enters the RF transceiver for demodulation. However, the price of the triplexer is more expensive than that of the duplexer, and the price of the duplexer is more expensive than that of a single filter. The SP4T switch is also more expensive than other SP3T switches, SP2T switches, etc. Therefore, the architectures of related technologies 1 and 2 are not conducive to cost reduction.

[0043] The radio frequency system provided in this embodiment includes a first filter module 10, a second filter module 20, a frequency division module 30 and a radio frequency processing module 40. The frequency division module 30 is respectively connected to the antenna and at least one second filter module 20, and can be switchably connected to any first filter module 10 among the plurality of first filter modules 10. The radio frequency processing module 40 is respectively connected to the first filter module 10 and the second filter module 20. The frequency division module 30 can be used to obtain multiple preset frequency band signals through frequency division processing, and output them to any first filter module 10 and the second filter module 20 respectively. Any first filtering module 10 and second filtering module 20 can respectively perform filtering processing on the received preset frequency band signal to obtain a target frequency band signal of one sub-band or a target frequency band signal of two sub-bands, so that the RF processing module 40 can receive and process multiple target frequency band signals. Therefore, the first filtering module 10 and the second filtering module 20 in this embodiment can respectively adopt a relatively cheap single-input single-output filter, or a single-input dual-output filter, and the RF system can omit devices such as triplexers and SP4T switches, which is beneficial to reducing the cost of the RF system on the basis of achieving the same CA combined communication.

[0044] In one embodiment, at least one first filtering module 10 includes a single SAW filter to support outputting one sub-band signal or two sub-band signals after filtering the received preset frequency band signal; and / or at least one first filtering module 10 includes a dual SAW filter to support outputting two sub-band signals after filtering the received preset frequency band signal.

[0045] Among them, when the first filtering module 10 includes a single SAW filter, the first end of the single SAW filter can be conductively connected to the frequency division module 30, and the second end of the single SAW filter can be connected to the RF processing module 40; when the first filtering module 10 includes a dual SAW filter, the first end of the dual SAW filter can be conductively connected to the frequency division module 30, and the two second ends of the dual SAW filter can be connected to the RF processing module 40.

[0046] Among them, when a first filtering module 10 only needs to output a sub-band signal, for example, the sub-band signal is a B41 signal, a single SAW filter can be used for filtering; when a first filtering module 10 needs to output two sub-band signals, if the center frequencies of the two sub-band signals are relatively close, for example, the two sub-band signals are B34+B39 signals, the first filtering module 10 can use a single SAW filter; if there is a certain gap between the center frequencies of the two sub-band signals, for example, the two sub-band signals are B1+B3 signals, the first filtering module 10 can use a dual SAW filter. Therefore, the corresponding SAW filter can be flexibly selected based on the center frequency of each sub-band, thereby improving the applicability of the first filtering module 10.

[0047] Since the first filtering module 10 may include a single SAW filter or a dual SAW filter, and the single SAW filter or the dual SAW filter is relatively cheap compared to other multiplexers, the RF system in this embodiment can further save costs.

[0048] In one embodiment, at least one second filtering module 20 includes a single SAW filter to support outputting one sub-band signal or two sub-band signals after filtering the received preset frequency band signal; and / or at least one second filtering module 20 includes a dual SAW filter to support outputting two sub-band signals after filtering the received preset frequency band signal.

[0049] Wherein, whether the second filtering module 20 includes a single SAW filter and / or a dual SAW filter can refer to the relevant introduction in the first filtering module 10, which will not be repeated here.

[0050] Since the second filtering module 20 may include a single SAW filter or a dual SAW filter, and the single SAW filter or the dual SAW filter is relatively cheap compared to other multiplexers, the RF system in this embodiment can further save costs.

[0051] In one embodiment, if Figure 3 As shown, the radio frequency system further includes: a gating module 50 .

[0052] A gating module, wherein a first end of the gating module is connected to a second end of the frequency dividing module 30, and a plurality of second ends of the gating module are respectively connected to a plurality of first filtering modules 10 correspondingly ( Figure 3 Taking two first filter modules 10 as an example, the gating module is used to select and connect the connection between any first filter module 10 and the frequency division module 30. Thus, the function of selectively connecting the frequency division module 30 and multiple first filter modules 10 can be realized through the gating module, so that any first filter module 10 receives a preset frequency band signal from the frequency division module 30.

[0053] The number of the second ends of the gating modules can be set accordingly according to the target demand number of the first filter module 10 in the actual CA combination demand. For example, when the target demand number of the first filter module 10 is two, the number of the second ends of the gating modules can be set to two, and at this time, the gating module can be, for example, a single-pole double-throw switch; when the target demand number of the first filter module 10 is three, the number of the second ends of the gating modules can be set to three, and at this time, the gating module can be, for example, a single-pole triple-throw switch.

[0054] In one of the embodiments, please refer to Figure 3 The frequency division module 30 includes: a first frequency division path 301 and a second frequency division path 302 .

[0055] The first frequency division path 301 is respectively connected to the first end of the frequency division module 30 and a second end of the frequency division module 30, and is used to filter out the RF signals other than the first preset frequency band signal in the carrier aggregation signal to obtain the first preset frequency band signal; the second frequency division path 302 is respectively connected to the first end of the frequency division module 30 and another second end of the frequency division module 30, and is used to filter out the RF signals other than the second preset frequency band signal in the carrier aggregation signal to obtain the second preset frequency band signal.

[0056] Among them, the first frequency division path 301 is in a straight-through state relative to the first preset frequency band signal, and is in a high-impedance state relative to other signals other than the first preset frequency band signal. Therefore, when the first frequency division path 301 receives a carrier aggregation signal, it can filter out other signals other than the first preset frequency band signal to obtain the first preset frequency band signal. The second frequency division path 302 is in a straight-through state relative to the second preset frequency band signal, and is in a high-impedance state relative to other signals other than the second preset frequency band signal. Therefore, when the second frequency division path 302 receives a carrier aggregation signal, it can filter out other signals other than the second preset frequency band signal to obtain the second preset frequency band signal. Therefore, the first frequency division path 301 and the second frequency division path 302 are respectively high-impedance circuits relative to the signal to be filtered, and the high-impedance circuit can usually be composed of devices such as inductors and capacitors, and its price cost is low. For example, the first frequency division path 301 and the second frequency division path 302 can be composed of PCB winding inductors and SMD surface-mount capacitors, respectively, and their low price is very low, and the cost can be almost ignored.

[0057] Optionally, the first preset frequency band includes a low frequency band, and the second preset frequency band includes at least one of a medium frequency band and a high frequency band; or the first preset frequency band includes at least one of a low frequency band and a medium frequency band, and the second preset frequency band includes a high frequency band; or the first preset frequency band includes at least one of a low frequency band, a medium frequency band, and a high frequency band, and the second preset frequency band includes an ultra-high frequency band. Thus, based on the frequency division processing of the first frequency division path 301 and the second frequency division path 302, a plurality of different preset frequency band signals can be obtained to meet different CA combination requirements of users.

[0058] In one embodiment, the first preset frequency band is smaller than the second preset frequency band; Figure 4 As shown:

[0059] The first frequency division path 301 may include: a first inductor, a second inductor and a first capacitor (corresponding to Figure 4 In the embodiment of the present invention, the first end of the first inductor is connected to the first end of the frequency division module 30, the second end of the first inductor and the first end of the second inductor are respectively connected to a second end of the frequency division module 30, the second end of the second inductor is connected to the first end of the first capacitor, and the second end of the first capacitor is grounded.

[0060] The second frequency division path 302 may include: a second capacitor, a third inductor and a third capacitor (corresponding to Figure 4 The first end of the second capacitor is connected to the first end of the frequency division module 30, the second end of the second capacitor and the first end of the third inductor are respectively connected to a second end of the frequency division module 30, the second end of the third inductor is connected to the second end of the third capacitor, and the second end of the third capacitor is grounded.

[0061] Thus, a first frequency division path 301 is formed by the first inductor, the second inductor and the first capacitor, which is in a direct pass state relative to the first preset frequency band signal and in a high impedance state relative to other signals except the first preset frequency band signal. A second frequency division path 302 with capacitive impedance is formed by the second capacitor, the third inductor and the third capacitor, which is in a direct pass state relative to the second preset frequency band signal and in a high impedance state relative to other signals except the second preset frequency band signal. In this embodiment, the first preset frequency band and the second preset frequency band can be adjusted in the preset frequency bands mentioned above by adjusting the parameters of each capacitor and inductor device (the figure shows that the first preset frequency band can be the medium frequency band MB and the second preset frequency band can be the high frequency band HB, which is only for illustration and not for limitation).

[0062] Figure 5 The simulation performance diagram of the first frequency division path 301 and the second frequency division path 302 is shown. Taking the first preset frequency band signal as an intermediate frequency signal and the second preset frequency band signal as a high frequency signal as an example, through the setting of the above-mentioned devices, the first frequency division path 301 generates a zero point with a stop band at the high frequency (refer to S2,1 curve), thereby passing the intermediate frequency and blocking the high frequency; the second frequency division path 302 generates a zero point with a stop band at the intermediate frequency (refer to S3,1 curve), thereby passing the high frequency and blocking the intermediate frequency.

[0063] Taking the intermediate frequency signal in the range of 1880-2170MHz and the high frequency signal in the range of 2500-2700MHz as examples, for the first preset frequency band signal of 1880-2170MHz, the first frequency division path 301 is in a straight-through state, with an impedance of about 50ohm and a small insertion loss; but for other signals of 2500-2700MHz, it is in a high-impedance state, with an infinite impedance and a large insertion loss. For the second preset frequency band signal of 2500-2700MHz, the second frequency division path 302 is in a straight-through state, with an impedance of about 50ohm and a small insertion loss; but for other signals of 1880-2170MHz, it is in a high-impedance state, with an infinite impedance and a large insertion loss.

[0064] Furthermore, based on the previous embodiment, each frequency division path may be further provided with devices such as capacitors and / or inductors to further improve the frequency division performance of each frequency division path. By adding capacitors and / or inductors, the zero point of the stop band of each frequency division path may be adjusted to further adjust the range of the preset frequency band obtained by the frequency division process.

[0065] For example, Figure 6 As shown, the first frequency division path 301 also includes: a fourth inductor (corresponding to Figure 5 The first end of the fourth inductor is connected to the second end of the first inductor and the first end of the second inductor respectively, and the second end of the fourth inductor is connected to a second end of the frequency division module 30; the second frequency division path 302 also includes: a fourth capacitor (corresponding to Figure 5 The first end of the fourth capacitor is connected to the second end of the second capacitor and the first end of the third inductor respectively, and the second end of the fourth capacitor is connected to a second end of the frequency division module 30.

[0066] Figure 7 The figure shows the simulation performance diagram of the first frequency division path 301 and the second frequency division path 302 by adding the fourth inductor and the fourth capacitor on the basis of the above embodiment. By setting the above devices, the first frequency division path 301 generates a zero point of the stop band at the medium and high frequencies (such as the concave point between 2.0-2.3GHz in the figure), thereby passing the low frequencies and blocking the medium and high frequencies; the second frequency division path 302 generates a zero point of the stop band at the low frequencies (such as the concave point near 1.0GHz in the figure), thereby passing the medium and high frequencies and blocking the low frequencies (the figure shows that the first preset frequency band can be the low frequency band LB, and the second preset frequency band can be the medium and high frequency band MHB, which is only for illustration and not for limitation).

[0067] Furthermore, based on the previous embodiment, the second frequency division path 302 may be further provided with devices such as capacitors and / or inductors to further improve the isolation performance between the frequency division paths. By adding capacitors and / or inductors, the zero point of the stop band of each frequency division path may be generated, and the isolation between the first frequency division path 301 of low-pass filtering and the second frequency division path 302 of high-pass filtering may be enhanced on the basis of adjusting the range of the preset frequency band obtained by the frequency division process.

[0068] For example, Figure 8 As shown, the second frequency division path 302 also includes: a fifth inductor and a fifth capacitor (corresponding to Figure 8 The first end of the fifth inductor is connected to the first end of the frequency division module 30 and the first end of the second capacitor respectively, the second end of the fifth inductor is connected to the first end of the fifth capacitor, and the second end of the fifth capacitor is grounded.

[0069] Please refer to Fig. 9 By adding the fifth inductor and the fifth capacitor, the second frequency division path 302 generates two zero points at low frequency (the S3,2 curve and the S3,1 curve have two concave points), thereby enhancing the out-of-band suppression capability of the filter and enhancing the isolation between the two frequency division paths.

[0070] It can be understood that the capacitance and inductance parameters in the above embodiments can be adjusted and set according to actual needs, and the selection of capacitance and inductance parameters needs to satisfy the following relationship: jωL+(1 / jωC)=0. For example, if a zero point is to be generated at f0=2GHz, the above formula can be expressed as j*2π*f0*L+1 / j*2π*f0*C=0, at this time L and C can take any values ​​that satisfy the expression.

[0071] In one embodiment, if Fig.10 As shown, the frequency division module 30 may also include: a third frequency division path 303, which is respectively connected to the first end of the frequency division module 30 and the other second end of the frequency division module 30, and is used to filter out the radio frequency signals other than the third preset frequency band signal in the carrier aggregation signal to obtain the third preset frequency band signal; wherein the third preset frequency band is smaller than the first preset frequency band, and the first preset frequency band is smaller than the second preset frequency band.

[0072] Among them, the selection of related devices and working principles of the third frequency division path 303 can refer to the relevant introduction of the above embodiment, and will not be repeated here. Optionally, based on the adjustment of the parameters of each device in the above embodiment, the third preset frequency band, the first preset frequency band, and the second preset frequency band can correspond to the low frequency band, the medium frequency band, and the high frequency band respectively; optionally, the third preset frequency band, the first preset frequency band, and the second preset frequency band can correspond to the low frequency band, the medium and high frequency band, and the ultra-high frequency band respectively. Therefore, based on the adjustment of the device parameters, the frequency division module 30 can realize the output function of multiple channels of signals in different preset frequency bands.

[0073] It can be understood that each inductor involved in the above embodiments can adopt PCB winding inductors, and each capacitor can adopt SMD surface mount capacitors. Therefore, the frequency division function of the frequency division module 30 can be realized based on low-cost hardware, greatly reducing the cost of the RF system.

[0074] In one embodiment, the RF processing module 40 includes: multiple amplifying units, some of the amplifying units are respectively connected to at least one first filtering module 10, and another part of the amplifying units are respectively connected to a second filtering module 20, each amplifying unit is used to amplify the received target frequency signal and output it to the RF transceiver.

[0075] Among them, some amplifying units are respectively connected to at least one first filter module 10, so that each amplifying unit in some amplifying units can receive the target frequency band signal output by one or more first filter modules 10; another part of the amplifying units are respectively connected to a second filter module 20, so that another part of the amplifying units can respectively receive the target frequency band signal output by the second filter module 20. Therefore, by setting a plurality of amplifying units, the RF processing module 40 can respectively receive the target frequency band signals from the first filter module 10 and the second filter module 20 at the same time, and receive and process the received target frequency band signals, so that the RF system supports a variety of CA combination functions, and effectively improves the control flexibility of the RF system.

[0076] Optionally, the receiving process includes low-noise amplification processing, and the amplifying unit may include a radio frequency switch and a low-noise amplifier. The radio frequency switch enables the amplifying unit to have multiple input terminals and receive target preset signals through the input terminals. The low-noise amplifier enables the amplifying unit to perform low-noise amplification processing on the input radio frequency signal.

[0077] In one embodiment, if Fig.11 As shown, the multiple amplification units include multiple medium and high frequency amplification units (such as 410 in the figure), and each medium and high frequency amplification unit is used to amplify the medium frequency sub-band signal or the high frequency sub-band signal. Therefore, the same amplification unit can realize low-noise amplification processing of the medium frequency sub-band signal and the high frequency sub-band signal at different times, and the multi-band amplification processing function of the amplification unit can enable the RF receiving module to have more receiving processing channels. Optionally, the multiple medium and high frequency amplification units can perform the gating function of different output ends and different medium and high frequency amplification units through the switch MUX in the figure, thereby improving the flexibility of the output.

[0078] In one embodiment, the plurality of amplification units further include a low frequency amplification unit (eg Fig.11 420) and / or an ultra-high frequency amplification unit (not shown in the figure), the low frequency amplification unit is used to amplify the low frequency sub-band signal, and the ultra-high frequency amplification unit is used to amplify the ultra-high frequency sub-band signal. As a result, the RF processing module 40 can also support the low-noise amplification processing function for the low frequency sub-band signal and / or the ultra-high frequency sub-band signal, thereby expanding the number of RF system CA combinations.

[0079] It can be understood that the above-mentioned RF processing module 40 can integrate LNAbank (RF receiving module, also called multi-channel multi-mode low noise amplifier module). Therefore, based on a single LNAbank, a frequency division module 30, a first filtering module 10, a second filtering module 20, etc., the RF system can support the receiving functions of various CA combinations while greatly saving costs, reducing the occupied area of ​​​​the device, and reducing the debugging workload of engineers.

[0080] It can be understood that the above-mentioned RF processing module 40 can also include other unit devices to realize other corresponding functions, for example, it can also include a power amplification unit composed of a power amplifier, etc. Each power amplification unit can be connected to the first filter module 10 and the second filter module 20 respectively, so that the RF processing module 40 can also have a transmission processing function and an uplink CA combination function. It can be understood that each first filter module 10 and the second filter module 20 connected to the power amplification unit can be the same as or different from the first filter module 10 and the second filter module 20 connected to the above-mentioned amplification unit.

[0081] In one embodiment, based on any one of the above embodiments or a combination of multiple embodiments, as Fig.12 As shown ( Fig.12 Only a first filter module 10 and a second filter module 20 are shown, and only the connection state of the first filter module 10 connected to the frequency division module 30 is shown). The radio frequency system may also include: a switching module 60, which is configured with a first end and multiple second ends, the first end of the switching module 60 is connected to the antenna, and at least one second end of the switching module 60 is connected to a frequency division module 30. The switching module 60 is used to select the connection between the conductive antenna and the frequency division module 30.

[0082] By setting the switching module 60, the connection between the antenna and the frequency division module 30 can be selectively conducted according to the radio frequency requirement, so that the frequency division module 30 can be selectively put into the frequency division processing working state.

[0083] Optionally, the other second ends of the switching module 60 can also be connected to other frequency division modules 30 respectively to meet the RF requirements of other CA combined frequency bands, further increase the number of CA combined frequency bands, and improve the RF performance of the RF system. Compared with the RF system that realizes the same number of CA combined frequency bands in the related technology, the cost can still be reduced.

[0084] Optionally, the other second end of the switching module 60 may also be directly connected to other radio frequency devices other than the frequency division module 30 to realize other radio frequency functions other than the CA combination, thereby improving the compatibility of the radio frequency system.

[0085] It can be understood that the above-mentioned switching module 60 can also be omitted to reduce the switch cost.

[0086] The following is a further explanation of one or more of the above embodiments with some specific embodiments:

[0087] Example 1, taking the 3CA combination of (B1+B3+B41, B34+B 39+B41) as an example:

[0088] like Fig.13 As shown, in this embodiment, the frequency division module 30 includes a first frequency division path 301 and a second frequency division path 302 respectively connected to the SP3T switch, the first frequency division path 301 is connected to the first end of the SPDT switch, the two second ends of the SPDT switch are respectively connected to the single SAW filter of B34+39 and the dual SAW filter of B1+3, the second frequency division path 302 is connected to the single SAW filter of B41, the single SAW filter of B34+39, the dual SAW filter of B1+3, and the single SAW filter of B41 are respectively connected to LNABank (taking the RF processing module 40 as LNABank as an example).

[0089] When the system needs to support downlink CA of B1+3+41, the signal received by the antenna passes through the SP3T switch and then enters the frequency division module 30. The first frequency division path 301 connects to the SPDT switch, the SPDT switch connects to the dual SAW filter of B1+3, and the second frequency division path 302 connects to the single SAW filter of B41. The signal enters the amplification units MHB2, MHB3 and MHB4 in the LNA Bank in three ways, and finally enters the RF transceiver for demodulation.

[0090] When the system needs to support B34+39+41 downlink CA, the signal received by the antenna passes through the SP3T switch and then enters the frequency division module 30. The first frequency division path 301 connects to the SPDT switch, and the SPDT switch connects to the single SAW filter of B34+39. The second frequency division path 302 connects to the single SAW filter of B41. The signal enters the amplification units MHB1 and MHB2 in the LNA Bank in two ways, and finally enters the RF transceiver for demodulation.

[0091] Therefore, this embodiment consists of a single SAW filter of B34+39, a dual SAW filter and a single SAW filter of B41, plus an SPDT switch and a device with frequency division function, which can realize B1+3+41 and B34+39+41 downlink CA communication, which can greatly reduce the cost of the RF system compared with related technologies.

[0092] Example 2, taking the 3CA combination of (B1+B3+B41, B34+B39+B41) and the 4CA combination of (B8+B1+B3+B41, B8+B34+B39+B41) as examples:

[0093] like Fig.14 As shown, in this embodiment, the frequency division module 30 includes a first frequency division path 301, a second frequency division path 302, and a third frequency division path 303 respectively connected to the SP3T switch, the first frequency division path 301 is connected to the B8 single SAW filter, the second frequency division path 302 is connected to the first end of the SPDT switch, the two second ends of the SPDT switch are respectively connected to the single SAW filter of B34+B39 and the dual SAW filter of B1+B3, the third frequency division path 303 is connected to the B41 single SAW filter, and each SAW filter is respectively connected to the LNA Bank (taking the RF processing module 40 as the LNA Bank as an example).

[0094] When the system needs to support the 3CA combination of (B1+B3+B41, B34+B39+B41), reference may be made to the relevant description of Example 1, which will not be repeated here.

[0095] When the system needs to support the 4CA combination of B8+B1+B3+B41, based on the above embodiment, the first frequency division path 301 is configured to output the B8 signal, thereby realizing the aforementioned 4CA combination communication based on the frequency division module 30, each switch and the B8 single SAW filter, the B1+B3 dual SAW filter, the B41 single SAW filter, and the LNA Bank.

[0096] When the system needs to support the 4CA combination of B8+B34+B39+B41, based on the above embodiment, the first frequency division path 301 is configured to output the B8 signal, thereby realizing the aforementioned 4CA combination communication based on the frequency division module 30, each switch and the B8 single SAW filter, the B34+B39 single SAW filter, the B41 single SAW filter, and the LNA Bank.

[0097] Therefore, this embodiment is based on the above-mentioned single SAW filter, double SAW filter, etc., plus an SPDT switch and a device with frequency division function, so as to realize 3CA combination of (B1+B3+B41, B34+B39+B41) and 4CA combination communication of (B8+B1+B3+B41, B8+B34+B39+B41), which can greatly reduce the cost of the RF system compared with the related technology.

[0098] Example 3, 3CA combination of (B1+B3+B41, B34+B39+B41), 4CA combination of (B8+B1+B3+B41, B8+B34+B39+B41)

[0099] like Fig.15 As shown, in this embodiment, the frequency division module 30 includes a first frequency division path 301 and a second frequency division path 302, and the gating module includes an SP3T switch. The selection of the filter and the working process can be combined with Figure X Therefore, this embodiment is based on the above-mentioned single SAW filter, double SAW filter, etc., and adds an SP3T switch and a frequency division device to realize 3CA combination (B1+B3+B41, B34+B39+B41) and 4CA combination communication (B8+B1+B 3+B41, B8+B 34+B 39+B 41), which can greatly reduce the cost of the RF system compared with the related technology.

[0100] The embodiment of the present application further provides a communication device, comprising: a radio frequency system according to any one or more of the above-mentioned combined embodiments. The radio frequency system according to the above-mentioned embodiments is conducive to reducing the cost of the communication device.

[0101] like Fig.16As shown, further, the above communication device is taken as a mobile phone 11 as an example for explanation, specifically, as Fig.16 As shown, the mobile phone 11 may include a memory 21 (which may optionally include one or more computer-readable storage media), a processor 22, a peripheral device interface 23, a radio frequency system 24 of the above-mentioned embodiment, and an input / output (I / O) subsystem 26. These components may communicate via one or more communication buses or signal lines 29. Those skilled in the art will appreciate that Fig.16 The illustrated mobile phone 11 does not constitute a limitation of the mobile phone, and may include more or fewer components than shown, or a combination of certain components, or a different arrangement of components. Fig.16 The various components shown in the EMBODIMENTS 2000 are implemented in hardware, software, or a combination of hardware and software, including one or more signal processing and / or application specific integrated circuits.

[0102] The memory 21 optionally includes a high-speed random access memory, and optionally also includes a non-volatile memory, such as one or more disk storage devices, flash memory devices, or other non-volatile solid-state memory devices. Exemplarily, the software components stored in the memory 21 include an operating system 211, a communication module (or an instruction set) 212, a global positioning system (GPS) module (or an instruction set) 213, etc.

[0103] The processor 22 and other control circuits (such as control circuits of switches in the radio frequency system 24) can be used to control the operation of the mobile phone 11. The processor 22 can be based on one or more microprocessors, microcontrollers, digital signal processors, baseband processors, power management units, audio codec chips, application-specific integrated circuits, etc.

[0104] The processor 22 may be configured to implement a control algorithm for controlling the use of an antenna in the handset 11. The processor 22 may also issue control commands for controlling switches in the radio frequency system 24, etc.

[0105] The I / O subsystem 26 couples input / output peripherals on the mobile phone 11, such as a keypad and other input control devices, to the peripheral device interface 23. The I / O subsystem 26 optionally includes a touch screen, buttons, tone generators, accelerometers (motion sensors), ambient light sensors and other sensors, light emitting diodes and other status indicators, data ports, etc. Exemplarily, a user can control the operation of the mobile phone 11 by supplying commands via the I / O subsystem 26, and can use the output resources of the I / O subsystem 26 to receive status information and other output from the mobile phone 11. For example, a user can press button 261 to turn the mobile phone on or off.

[0106] Any reference to memory, storage, database or other media used in this application may include non-volatile and / or volatile memory. Suitable non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RM), which is used as an external cache memory. As an illustration and not limitation, RM is available in various forms, such as static RM (SRM), dynamic RM (DRM), synchronous DRM (SDRM), double data rate SDRM (DDR SDRM), enhanced SDRM (ESDRM), synchronous link (Synchlink) DRM (SLDRM), memory bus (Rmbus) direct RM (RDRM), direct memory bus dynamic RM (DRDRM) and memory bus dynamic RM (RDRM).

[0107] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0108] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A radio frequency system, characterized in that: include: A plurality of first filtering modules and at least one second filtering module, each filtering module is used to support filtering processing of a received preset frequency band signal to output a target frequency band signal, wherein the target frequency band signal includes a sub-band signal or two sub-band signals of the preset frequency band signal; A frequency division module is configured with a first end and a plurality of second ends, wherein the first end is used to receive a carrier aggregation signal from an antenna, and one of the second ends is switchably connected to any first filter module among the plurality of first filter modules, and at least another second end is respectively connected to the at least one second filter module, and the frequency division module is used to support frequency division processing of the carrier aggregation signal, and output corresponding preset frequency band signals to any first filter module and the at least one second filter module respectively; The radio frequency processing module is connected to the plurality of first filter modules and the at least one second filter module respectively, and is used to support reception processing of each of the target frequency band signals from any of the first filter modules and the at least one second filter module.

2. The radio frequency system according to claim 1, characterized in that: At least one of the first filtering modules includes a single SAW filter to support filtering the received preset frequency band signal and then outputting the one sub-frequency band signal or the two sub-frequency band signals; and / or At least one of the first filtering modules includes a dual SAW filter to support filtering of the received preset frequency band signal and then outputting the two sub-frequency band signals.

3. The radio frequency system according to claim 1, characterized in that: At least one of the second filtering modules includes a single SAW filter to support filtering the received preset frequency band signal and then outputting the one sub-frequency band signal or the two sub-frequency band signals; and / or At least one of the second filtering modules includes a dual SAW filter to support filtering the received preset frequency band signal and then outputting the two sub-frequency band signals.

4. The radio frequency system according to claim 1, characterized in that: The frequency division module comprises: A first frequency division path is connected to a first end of the frequency division module and a second end of the frequency division module respectively, and is used to filter out radio frequency signals other than the first preset frequency band signal in the carrier aggregation signal to obtain the first preset frequency band signal; The second frequency division path is connected to the first end of the frequency division module and the other second end of the frequency division module respectively, and is used to filter out the radio frequency signal other than the second preset frequency band signal in the carrier aggregation signal to obtain the second preset frequency band signal.

5. The radio frequency system according to claim 4, characterized in that: The first preset frequency band includes a low frequency band, and the second preset frequency band includes at least one of a medium frequency band and a high frequency band; or the first preset frequency band includes at least one of a low frequency band and a medium frequency band, and the second preset frequency band includes a high frequency band; or the first preset frequency band includes at least one of a low frequency band, a medium frequency band, and a high frequency band, and the second preset frequency band includes an ultra-high frequency band.

6. The radio frequency system according to claim 4, characterized in that: The first preset frequency band is smaller than the second preset frequency band; the first frequency division path includes: A first inductor, a second inductor and a first capacitor, wherein a first end of the first inductor is connected to a first end of the frequency division module, a second end of the first inductor and a first end of the second inductor are respectively connected to a second end of the frequency division module, a second end of the second inductor is connected to a first end of the first capacitor, and a second end of the first capacitor is grounded; The second frequency division path comprises: A second capacitor, a third inductor and a third capacitor, the first end of the second capacitor is connected to the first end of the frequency division module, the second end of the second capacitor and the first end of the third inductor are respectively connected to a second end of the frequency division module, the second end of the third inductor is connected to the second end of the third capacitor, and the second end of the third capacitor is grounded.

7. The radio frequency system according to claim 6, characterized in that: The first frequency division path further includes: a fourth inductor, wherein a first end of the fourth inductor is respectively connected to the second end of the first inductor and the first end of the second inductor, and a second end of the fourth inductor is connected to a second end of the frequency division module; The second frequency division path further includes: A fourth capacitor, wherein a first end of the fourth capacitor is respectively connected to the second end of the second capacitor and the first end of the third inductor, and a second end of the fourth capacitor is connected to a second end of the frequency division module.

8. The radio frequency system according to claim 7, characterized in that: The second frequency division path further includes: A fifth inductor and a fifth capacitor, wherein the first end of the fifth inductor is respectively connected to the first end of the frequency division module and the first end of the second capacitor, the second end of the fifth inductor is connected to the first end of the fifth capacitor, and the second end of the fifth capacitor is grounded.

9. The radio frequency system according to claim 4, characterized in that: The frequency division module also includes: A third frequency division path is connected to the first end of the frequency division module and the other second end of the frequency division module respectively, and is used to filter out the radio frequency signal other than the third preset frequency band signal in the carrier aggregation signal to obtain the third preset frequency band signal; The third preset frequency band is smaller than the first preset frequency band, and the first preset frequency band is smaller than the second preset frequency band.

10. The radio frequency system according to any one of claims 1 to 9, characterized in that: Also includes: A gating module, wherein the first end of the gating module is connected to a second end of the frequency dividing module, and the multiple second ends of the gating module are respectively connected to the multiple first filtering modules, and the gating module is used to select and conduct the connection between any of the first filtering modules and the frequency dividing module.

11. The radio frequency system according to any one of claims 1 to 9, characterized in that: The radio frequency processing module comprises: A plurality of amplifying units, some of which are respectively connected to at least one of the first filtering modules, and another part of which are respectively connected to a second filtering module, each of which is used to amplify the received target frequency signal and then output it to the RF transceiver.

12. The radio frequency system according to claim 11, characterized in that: The multiple amplifying units include multiple medium and high frequency amplifying units, and each of the medium and high frequency amplifying units is used to amplify a medium frequency sub-band signal or a high frequency sub-band signal.

13. The radio frequency system according to claim 12, characterized in that: The multiple amplifying units further include a low-frequency amplifying unit and / or an ultra-high frequency amplifying unit. The low-frequency amplifying unit is used to amplify the low-frequency sub-band signal, and the ultra-high frequency amplifying unit is used to amplify the ultra-high frequency sub-band signal.

14. The radio frequency system according to any one of claims 1 to 9, characterized in that: Also includes: The switching module is configured with a first end and multiple second ends. The first end of the switching module is connected to the antenna, and at least one second end of the switching module is connected to one of the frequency division modules. The switching module is used to select and conduct the connection between the antenna and the frequency division module.

15. A communication device, characterized in that: include: A radio frequency system as claimed in any one of claims 1 to 14.

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