Multiplexer and radio frequency front-end module

Abstract

The embodiment of the invention provides a multiplexer and a radio frequency front-end module, and relates to the technical field of filtering, the multiplexer comprises a plurality of duplexers, the duplexers are arranged in a cascading manner, aiming at the duplexers of two adjacent stages, the current-stage duplexer is used for dividing a signal to be transmitted into a low-frequency wave band and a high-frequency wave band; the next-stage duplexer is used for dividing a target wave band signal from the low-frequency wave band and / or the high-frequency wave band; wherein the low-frequency wave band and / or the high-frequency wave band corresponding to the output channel of the current-stage duplexer covers the working frequency band of the next-stage duplexer. On the basis, according to the multiplexer and the radio frequency front-end module provided by the invention, the circuit area and the design complexity can be reduced by integrating or designing a plurality of duplexer structures.

Description

Technical Field

[0001] The present invention relates to the field of filtering technology, and in particular to a multiplexer and a radio frequency front-end module. Background Art

[0002] With the continuous development of communication technology, the performance of filters, as key components of the RF front end, directly affects the overall performance of the communication system. In multi-band communication systems, in order to meet the processing requirements of signals in different frequency bands, multiple filters are usually used to process the signals of each frequency band separately.

[0003] Taking a quadplexer as an example, a traditional quadplexer usually integrates four filters of different frequency bands. Although the above combination can realize the simultaneous processing of multi-band signals to a certain extent, it also brings new problems. Since the four filters operate in different frequency bands, there may be interference between them, especially in the case of tight integration, this interference may lead to a decline in overall performance. In addition, in order to reduce this interference and optimize the performance of the filter, the design of the matching circuit becomes very complicated, requiring a lot of design and simulation experiments to ensure its performance is optimal.

[0004] Based on this, there is an urgent need for a multiplexer solution that can reduce circuit area and design complexity. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a multiplexer and a radio frequency front-end module, which can reduce circuit area and design complexity by integrating or designing multiple duplexer structures.

[0006] In order to achieve the above purpose, the technical solution adopted by the embodiment of the present invention is as follows:

[0007] In a first aspect, the present invention provides a multiplexer, comprising a plurality of duplexers, each duplexer being cascaded, wherein for two adjacent duplexers, the current duplexer is used to divide a signal to be transmitted into a low-frequency band and a high-frequency band; the next duplexer is used to divide a target band signal from the low-frequency band and / or the high-frequency band;

[0008] The low-frequency band and / or high-frequency band corresponding to the output channel of the current-stage duplexer covers the working frequency band of the next-stage duplexer.

[0009] Optionally, when the multiplexer includes N output channels, the number of duplexers satisfies: N-1, where N is a positive integer greater than 1.

[0010] Optionally, when the multiplexer includes four output channels, the multiplexer outputs four target band signals from the signal to be transmitted through the four output channels, and when the multiplexer includes a first duplexer, a second duplexer and a third duplexer, two output channels of the first duplexer are respectively connected to a receiving channel of the second duplexer and a receiving channel of the third duplexer;

[0011] A first duplexer is used to divide the signal to be transmitted into a first low-frequency band and a first high-frequency band; the first low-frequency band includes at least two target band signals; the first high-frequency band includes at least two target band signals; wherein the frequencies corresponding to the target band signals in the first low-frequency band and the first high-frequency band are different;

[0012] The stopband of one of the output channels of the first duplexer covers each target band signal in the first low frequency band, and the passband covers each target band signal in the first high frequency band;

[0013] And / or the stopband of another output channel of the first duplexer covers each target band signal in the first high frequency band, and the passband covers each target band signal in the first low frequency band.

[0014] Optionally, the first low-frequency band includes a first target band signal and a second target band signal; the first high-frequency band includes a third target band signal and a fourth target band signal; and when the frequencies of the first target band signal, the second target band signal, the third target band signal and the fourth target band signal increase in sequence,

[0015] The second duplexer or the third duplexer is used to divide the first low-frequency band into a first target band signal and a second target band signal;

[0016] The stopband of one of the output channels of the second duplexer or the third duplexer covers the second target band signal, the third target band signal and the fourth target band signal, and the passband covers the first target band signal;

[0017] And / or the stopband of another output channel of the second duplexer or the third duplexer covers the first target band signal, the third target band signal and the fourth target band signal, and the passband covers the second target band signal.

[0018] Optionally, the first low-frequency band includes a first target band signal and a second target band signal; the first high-frequency band includes a third target band signal and a fourth target band signal; wherein, when the frequencies of the first target band signal, the second target band signal, the third target band signal and the fourth target band signal increase in sequence,

[0019] The second duplexer or the third duplexer is used to divide the first high frequency band into a third target band signal and a fourth target band signal;

[0020] The stop band of one of the output channels of the second duplexer or the third duplexer covers the first target band signal, the second target band signal and the fourth target band signal, and the pass band covers the third target band signal;

[0021] And / or the stopband of another output channel of the second duplexer or the third duplexer covers the first target band signal, the second target band signal and the third target band signal, and the passband covers the fourth target band signal.

[0022] Optionally, when the multiplexer includes four output channels, the multiplexer outputs four target band signals from the signal to be transmitted through the four output channels, and when the multiplexer includes a first duplexer, a second duplexer, and a third duplexer, one of the output channels of the first duplexer is connected to a receiving channel of the second duplexer, and one of the output channels of the second duplexer is connected to a receiving channel of the third duplexer;

[0023] The first duplexer is used to divide the signal to be transmitted into a second low-frequency band and a second high-frequency band; the second low-frequency band includes a target band signal; the second high-frequency band includes at least three target band signals; wherein the frequencies corresponding to the target band signals in the second low-frequency band and the second high-frequency band are different;

[0024] The stopband of one of the output channels of the first duplexer covers the target band signal in the second low frequency band, and the passband covers the target band signals in the second high frequency band;

[0025] The stopband of another output channel of the first duplexer covers each target band signal in the second high frequency band, and the passband covers the target band signal in the second low frequency band.

[0026] Optionally, the second high frequency band includes a second target band signal, a third target band signal and a fourth target band; the second low frequency band includes a first target band signal, and when the frequencies of the first target band signal, the second target band signal, the third target band signal and the fourth target band signal increase in sequence,

[0027] A second duplexer is used to divide the second high-frequency band into a second target band signal and a third high-frequency band, and the second target band signal is output through one of the output channels of the second duplexer;

[0028] The stopband of one of the output channels of the second duplexer covers the target band signals in the third high frequency band, and the passband covers the second target band signals; the stopband of another output channel of the second duplexer covers the second target band signals, and the passband covers the target band signals in the third high frequency band;

[0029] A third duplexer, used for dividing the third high frequency band into a third target band signal and a fourth target band signal;

[0030] Among them, the stopband of one output channel of the third duplexer covers the third target band signal, and the passband covers the fourth target band signal; the stopband of another output channel of the third duplexer covers the fourth target band signal, and the passband covers the third target band signal.

[0031] Optionally, when the multiplexer includes four output channels, the multiplexer outputs four target band signals from the signal to be transmitted through the four output channels, and when the multiplexer includes a first duplexer, a second duplexer, and a third duplexer, one of the output channels of the first duplexer is connected to a receiving channel of the second duplexer, and one of the output channels of the second duplexer is connected to a receiving channel of the third duplexer;

[0032] A first duplexer is used to divide the signal to be transmitted into a third low-frequency band and a fourth high-frequency band; the third low-frequency band includes at least three target band signals; the fourth high-frequency band includes one target band signal; wherein the frequencies corresponding to the target band signals in the third low-frequency band and the fourth high-frequency band are different;

[0033] The stopband of one of the output channels of the first duplexer covers the target band signal in the fourth high frequency band, and the passband covers the target band signals in the third low frequency band;

[0034] The stopband of another output channel of the first duplexer covers each target band signal in the third low frequency band, and the passband covers each target band signal in the fourth high frequency band.

[0035] Optionally, the third low frequency band includes a first target band signal, a second target band signal, and a third target band, the fourth high frequency band includes a fourth target band signal, and the frequencies of the first target band signal, the second target band signal, the third target band signal, and the fourth target band signal increase in sequence.

[0036] A second duplexer is used to divide the third low-frequency band into a first target band signal and a fourth low-frequency band, and the first target band signal is output through another output channel of the second duplexer;

[0037] Among them, the stopband of one output channel of the second duplexer covers the first target band signal, and the passband covers the target band signals in the fourth low-frequency band; the stopband of another output channel of the second duplexer covers the target band signals in the fourth low-frequency band, and the passband covers the first target band signal;

[0038] A third duplexer, used for dividing the fourth low frequency band into a second target band signal and a third target band signal;

[0039] Among them, the stopband of one output channel of the third duplexer covers the second target band signal, and the passband covers the third target band signal; the stopband of another output channel of the third duplexer covers the third target band signal, and the passband covers the second target band signal.

[0040] In a second aspect, the present invention further provides a radio frequency front-end module, comprising the multiplexer described in any one of the above-mentioned first aspects.

[0041] A multiplexer and a radio frequency front-end module provided by an embodiment of the present invention have the following beneficial effects:

[0042] The present invention provides a multiplexer, including a plurality of duplexers, each duplexer is cascaded, and for two adjacent duplexers, the current duplexer is used to divide the signal to be transmitted into a low-frequency band and a high-frequency band; the next duplexer is used to divide the target band signal from the low-frequency band and / or the high-frequency band; wherein the low-frequency band and / or the high-frequency band corresponding to the output channel of the current duplexer covers the working frequency band of the next duplexer. Based on this, the multiplexer and RF front-end module provided by the present invention can reduce the circuit area and design complexity by integrating or designing multiple duplexer structures, while avoiding the interference generated when the filter works in different frequency bands, thereby improving the performance of the overall multiplexer.

[0043] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0045] Figure 1 One of the structural schematic diagrams of the multiplexer provided by the embodiment of the present invention is shown;

[0046] Figure 2 The second structural schematic diagram of the multiplexer provided by the embodiment of the present invention is shown;

[0047] Figure 3 One of the simulation effect diagrams of the first duplexer provided by the embodiment of the present invention is shown;

[0048] Figure 4 One of the simulation effect diagrams of the multiplexer provided by the embodiment of the present invention is shown;

[0049] Figure 5 The third structural schematic diagram of the multiplexer provided by the embodiment of the present invention is shown;

[0050] Figure 6 The second simulation effect diagram of the first duplexer provided by the embodiment of the present invention is shown;

[0051] Figure 7 The second simulation effect diagram of the multiplexer provided by the embodiment of the present invention is shown;

[0052] Figure 8 A fourth structural schematic diagram of a multiplexer provided in an embodiment of the present invention is shown;

[0053] Fig. 9 The third simulation effect diagram of the first duplexer provided by the embodiment of the present invention is shown;

[0054] Fig.10 The third diagram shows the simulation effect of the multiplexer provided by the embodiment of the present invention.

[0055] Icons: 10-multiplexer; 11A-current duplexer; 11B-next duplexer; 12-first duplexer; 13-second duplexer; 14-third duplexer. DETAILED DESCRIPTION

[0056] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0057] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0058] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0059] As described in the background technology, taking a conventional quadplexer as an example, four filters of different frequency bands are usually integrated through a matching circuit. Although it can realize the simultaneous processing of multi-band signals to a certain extent, the four filters work in different frequency bands, which will cause signal interference and lead to the decline of the overall performance of the quadplexer.

[0060] Based on this, the present invention provides a multiplexer solution, which can avoid signal interference between filters in the prior art while reducing circuit area and design complexity.

[0061] First, please refer to Figure 1 , Figure 1 A structural schematic diagram of a multiplexer provided by the present invention is shown. The present invention provides a multiplexer 10, including multiple duplexers, each duplexer is cascaded, and for two adjacent duplexers, the current duplexer 11A is used to divide the signal to be transmitted into a low-frequency band and a high-frequency band; the next duplexer 11B is used to divide the target band signal from the low-frequency band and / or the high-frequency band.

[0062] The low-frequency band and / or high-frequency band corresponding to the output channel of the current-stage duplexer 11A covers the working frequency band of the next-stage duplexer 11B.

[0063] Based on this, in this embodiment, the multiplexer includes at least a plurality of duplexers, and each duplexer is cascaded to form different cascaded setting structures, so that some frequency bands can enjoy the suppression addition of at least two duplexers, greatly improving the suppression capability of the corresponding multiplexer.

[0064] It should be noted that the cascaded duplexers in this embodiment do not limit the number of duplexers at each level and / or do not limit the connection method of each duplexer.

[0065] For example, when the multiplexer includes three duplexers, a multiplexer including a three-level connection relationship can be constructed. At this time, the output and output channels of each duplexer are connected in sequence, and the first-level duplexer, the second-level duplexer and the third-level duplexer each correspond to a duplexer.

[0066] In another possible implementation, when the multiplexer includes three duplexers, a multiplexer including two-stage connection relationships can also be formed, for example, the first-stage duplexer includes one duplexer, and the second-stage duplexer includes two duplexers. The connection structure of the above two-stage duplexer is different from the connection structure of the three-stage duplexer.

[0067] In this embodiment, different cascade relationships may correspond to a variety of different duplexer connection relationships and different duplexer number relationships.

[0068] In addition, the multiplexer in this embodiment can be applied to a triplexer, a quadplexer, and other N multiplexers, where N can be understood as the number of output channels corresponding to the multiplexer, and the number of duplexers required can satisfy: N-1, where N is a positive integer greater than 1. Taking a quadplexer as an example, three duplexers may be required at this time.

[0069] Hereinafter, the solution provided by the present invention will be described in detail using a quadplexer as an example in different embodiments.

[0070] Before introducing the embodiments, for the convenience of description, the above-mentioned quadplexer is used to divide the signal to be transmitted with a passband range of: f0-ft into 4 segments, wherein the target band signals to be acquired are arranged from small to large according to the signal frequency, which can be represented in sequence as: the first target band signal B1; the second target band signal B2; the third target band signal B3; the fourth target band signal B4.

[0071] First embodiment

[0072] Please refer to Figure 2 , Figure 2 A structural schematic diagram of the multiplexer in this embodiment is shown; when the multiplexer 10 includes a first duplexer 12, a second duplexer 13 and a third duplexer 14, the two output channels of the first duplexer 12 are connected to the receiving channels of the second duplexer 13 and the third duplexer 14 respectively.

[0073] The multiplexer provided in this embodiment includes two stages, that is, the first duplexer 12 is used as the current first-stage duplexer, and the second duplexer 13 or the third duplexer 14 is used as the next-stage duplexer; the first duplexer 12 is used to divide the signal to be transmitted into a low-frequency band and a high-frequency band; the second duplexer 13 or the third duplexer 14 is used to divide the target band signal from the low-frequency band and / or the high-frequency band. Among them, the second duplexer 13 or the third duplexer 14 is a duplexer of the same stage.

[0074] The first duplexer 12 is used to divide the signal to be transmitted into a first low-frequency band and a first high-frequency band; the first low-frequency band includes at least two target band signals; the first high-frequency band includes at least two target band signals; wherein the frequencies corresponding to the target band signals in the first low-frequency band and the first high-frequency band are different.

[0075] In this embodiment, the first low-frequency band includes two target band signals, which may be a first target band signal B1 and a second target band signal B2; the first high-frequency band includes two target band signals, which may be a third target band signal B3; and a fourth target band signal B4.

[0076] The stopband of one output channel of the first duplexer 12 covers each target band signal in the first low frequency band, and the passband covers each target band signal in the first high frequency band.

[0077] And / or the stopband of another output channel of the first duplexer 12 covers each target band signal in the first high frequency band, and the passband covers each target band signal in the first low frequency band.

[0078] To avoid interference caused by filters operating in different frequency bands and improve the performance of the overall multiplexer, please refer to Figure 3 , Figure 3 The oscilloscope curve of the first duplexer in the first embodiment is shown. In the embodiment, one of the output channels of the first duplexer 12, i.e., the low-frequency channel, has a corresponding passband that needs to cover the frequency bands corresponding to the first target band signal B1 and the second target band signal B2, and the stopband needs to cover the frequency bands corresponding to the third target band signal B3 and the fourth target band signal B4. Correspondingly, in the embodiment, another output channel of the first duplexer 12, i.e., the high-frequency channel, has a corresponding passband that needs to cover the frequency bands corresponding to the third target band signal B3 and the fourth target band signal B4, and the corresponding stopband needs to cover the frequency bands corresponding to the first target band signal B1 and the second target band signal B2.

[0079] In this embodiment, if the second duplexer 13 is used to receive the first low frequency band and the third duplexer 14 is used to receive the first high frequency band, then the two channels corresponding to the second duplexer 13 can respectively output the first target band signal B1 and the second target band signal B2; similarly, the two channels corresponding to the third duplexer 14 can respectively output the third target band signal B3 and the fourth target band signal B4.

[0080] The second duplexer 13 is used to divide the first low-frequency band into a first target band signal B1 and a second target band signal B2.

[0081] The stopband of one output channel of the second duplexer 13 covers the second target band signal B2 , the third target band signal B3 , and the fourth target band signal B4 , and the passband covers the first target band signal B1 .

[0082] The stopband of another output channel of the second duplexer 13 covers the first target band signal B1 , the third target band signal B3 , and the fourth target band signal B4 ; and the passband covers the second target band signal B2 .

[0083] Correspondingly, the third duplexer 14 is used to divide the first high frequency band into a third target band signal B3 and a fourth target band signal B4;

[0084] The stopband of one output channel of the third duplexer 14 covers the first target band signal B1, the second target band signal B2 and the fourth target band signal B4, and the passband covers the third target band signal B3;

[0085] The stopband of another output channel of the third duplexer 14 covers the first target band signal B1 , the second target band signal B2 , and the third target band signal B3 , and the passband covers the fourth target band signal B4 .

[0086] Correspondingly, due to the characteristics of the duplexer itself, the frequencies of the target band signals corresponding to the two output channels of the duplexer are close and meet a certain suppression. That is, the frequencies corresponding to the first target band signal B1 and the second target band signal B2 are adjacent and suppress each other. The frequencies corresponding to the third target band signal B3 and the fourth target band signal B4 are adjacent and suppress each other.

[0087] Please refer to Figure 4 , Figure 4 The simulation results of the multiplexer in the first embodiment are shown, wherein dB(S(2,1)), dB(S(3,1)), dB(S(4,1)) and dB(S(5,1)) correspond to the first target band signal B1, the second target band signal B2, the third target band signal B3 and the fourth target band signal B4, respectively.

[0088] In this embodiment, taking the output channel corresponding to the fourth target band signal B4 as an example, the channel is composed of the high-frequency channel of the first duplexer 12 and the high-frequency channel of the third duplexer 14 in cascade, and the corresponding passband frequency meets the frequency band corresponding to the fourth target band signal B4, and the stopband meets the frequency band formed by the first target band signal B1, the second target band signal B2 and the third target band signal B3. Based on this, the insertion loss of the output channel corresponding to the fourth target band signal B4 meets the superposition value of the insertion loss between the first duplexer 12 and the third duplexer 14.

[0089] Furthermore, the suppression of the first target band signal B1, the second target band signal B2, and the third target band signal B3 is also composed of the suppression superposition between the first duplexer 12 (B1+B2) and the third duplexer 14 (B1+B2+B3). It can be seen that the output channel pair corresponding to the fourth target band signal B4 can achieve double suppression of the frequency bands corresponding to the first target band signal B1 and the second target band signal B2, thereby greatly improving the suppression degree corresponding to the multiplexer.

[0090] In this embodiment, the multiplexer includes a plurality of duplexers, and the duplexers are cascaded to improve stopband suppression and effectively avoid signal interference between filters in the prior art.

[0091] Second embodiment

[0092] The multiplexer provided in this embodiment includes a three-stage cascade structure, that is, the first duplexer 12 is used as the current first-stage duplexer, and the second duplexer 13 connected thereto is used as the next-stage duplexer; the first duplexer 12 is used to divide the signal to be transmitted into a low-frequency band and a high-frequency band; the second duplexer 13 is used to divide the target band signal from the high-frequency band. Correspondingly, the second duplexer 13 is used as the current first-stage duplexer, and the third duplexer 14 connected thereto is used as the next-stage duplexer, that is, the second duplexer 13 is used to divide the signal to be transmitted (that is, the high-frequency band signal obtained from the first duplexer 12) into a low-frequency band and a high-frequency band; the third duplexer 14 is used to divide the target band signal from the low-frequency band and / or the high-frequency band. In this embodiment, the second duplexer 13 and the third duplexer 14 are duplexers of different stages.

[0093] Please refer to Figure 5 , Figure 5 Another structural schematic diagram of the multiplexer in this embodiment is shown; when the multiplexer 10 includes a first duplexer 12, a second duplexer 13 and a third duplexer 14, one of the output channels of the first duplexer 12 is connected to the receiving channel of the second duplexer 13, and one of the output channels of the second duplexer 13 is connected to the receiving channel of the third duplexer 14;

[0094] The first duplexer 12 is used to divide the signal to be transmitted into a second low-frequency band and a second high-frequency band; the second low-frequency band includes a target band signal; the second high-frequency band includes at least three target band signals; wherein the frequencies corresponding to the target band signals in the second low-frequency band and the second high-frequency band are different.

[0095] In this embodiment, the second low frequency band includes a target band signal, which may be the first target band signal B1; the second high frequency band includes three target band signals, which may be the frequency bands corresponding to the second target band signal B2, the third target band signal B3 and the fourth target band signal B4.

[0096] The stopband of one of the output channels of the first duplexer 12 covers the target band signals in the second low frequency band, and the passband covers the target band signals in the second high frequency band.

[0097] The stopband of another output channel of the first duplexer 12 covers each target band signal in the second high frequency band, and the passband covers the target band signal in the second low frequency band.

[0098] In this embodiment, the other output channel of the first duplexer 12, i.e., the low-frequency channel, has a corresponding stopband that needs to cover the frequency bands corresponding to the second target band signal B2, the third target band signal B3, and the fourth target band signal B4, and the corresponding passband needs to cover the frequency band corresponding to the first target band signal B1.

[0099] To avoid interference caused by filters operating in different frequency bands and improve the performance of the overall multiplexer, please refer to Figure 6 , Figure 6 The oscilloscope curve of the first duplexer in the second embodiment is shown. In the embodiment, one of the output channels of the first duplexer 12, i.e., the high-frequency channel, the corresponding stopband needs to cover the first target band signal B1; the passband needs to cover the frequency bands corresponding to the second target band signal B2, the third target band signal B3, and the fourth target band signal B4. It can be seen from the figure that the target band signals obtained by the multiplexer in the embodiment have a high degree of suppression.

[0100] In this embodiment, the second duplexer 13 is used to divide the second high-frequency band into a second target band signal B2 and a third high-frequency band. The third high-frequency band is a frequency band corresponding to the third target band signal B3 and the fourth target band signal B4. The second target band signal B2 and the third high-frequency band are output on different output channels of the second duplexer 13.

[0101] In one possible implementation, one of the output channels of the second duplexer 13 can output the third high-frequency band. At this time, the passband of the channel covers the target band signals in the third high-frequency band, and the stopband covers the second target band signal B2; correspondingly, the passband of another output channel of the second duplexer 13 covers the second target band signal B2, and the stopband covers the target band signals in the third high-frequency band.

[0102] In this embodiment, the third duplexer 14 is used to divide the third high frequency band into a third target band signal B3 and a fourth target band signal B4.

[0103] Among them, when one of the output channels of the third duplexer 14 is used to output the fourth target band signal B4, the stopband of the channel covers the third target band signal B3, and the passband covers the fourth target band signal B4; correspondingly, the stopband of another output channel of the third duplexer 14 covers the fourth target band signal B4, and the passband covers the third target band signal B3.

[0104] Please refer to Figure 7 , Figure 7 The simulation results of the multiplexer in the second embodiment are shown, wherein dB(S(2,1)), dB(S(3,1)), dB(S(4,1)) and dB(S(5,1)) correspond to the first target band signal B1, the second target band signal B2, the third target band signal B3 and the fourth target band signal B4, respectively. It can be seen that the target band signals obtained by the multiplexer in the present embodiment have a higher degree of suppression.

[0105] In this embodiment, the input channel of the second duplexer 13 receives the frequency band corresponding to the second target band signal B2, the third target band signal B3, and the fourth target band signal B4, and then divides the second target band signal B2 and the frequency band corresponding to the third target band signal B3 and the fourth target band signal B4. At this time, the frequency band corresponding to the third target band signal B3 and the fourth target band signal B4 is used as the input of the third duplexer 14, and the third duplexer 14 is used to filter out the third target band signal B3 and the fourth target band signal B4.

[0106] Correspondingly, due to the characteristics of the duplexer itself, the frequencies of the target band signals outputted by the two output channels of the duplexer are close and meet certain suppression. Taking the third duplexer 14 as an example, the frequencies corresponding to the third target band signal B3 and the fourth target band signal B4 also need to meet the relationship of being adjacent and mutually suppressive.

[0107] Embodiment 3

[0108] The multiplexer provided in this embodiment includes a three-stage cascade relationship, that is, the first duplexer 12 is used as the current first-stage duplexer, and the second duplexer 13 connected thereto is used as the next-stage duplexer; the first duplexer 12 is used to divide the signal to be transmitted into a low-frequency band and a high-frequency band; the second duplexer 13 is used to divide the target band signal from the high-frequency band. Correspondingly, the second duplexer 13 is used as the current first-stage duplexer, and the third duplexer 14 connected thereto is used as the next-stage duplexer, that is, the second duplexer 13 is used to divide the signal to be transmitted (that is, the low-frequency band signal obtained from the first duplexer 12) into a low-frequency band and a high-frequency band; the third duplexer 14 is used to divide the target band signal from the low-frequency band.

[0109] In this embodiment, the second duplexer 13 and the third duplexer 14 are duplexers of different levels.

[0110] Please refer to Figure 8 , Figure 8 Another structural schematic diagram of the multiplexer in this embodiment is shown; when the multiplexer 10 includes a first duplexer 12, a second duplexer 13 and a third duplexer 14, one of the output channels of the first duplexer 12 is connected to the receiving channel of the second duplexer 13, and one of the output channels of the second duplexer 13 is connected to the receiving channel of the third duplexer 14;

[0111] The first duplexer 12 is used to divide the signal to be transmitted into a third low-frequency band and a fourth high-frequency band; the third low-frequency band includes at least three target band signals; the fourth high-frequency band includes one target band signal; wherein the frequencies corresponding to the target band signals in the third low-frequency band and the fourth high-frequency band are different.

[0112] In this embodiment, the fourth high frequency band includes a target band signal, which may be a fourth target band signal B4; the third low frequency band includes three target band signals, which may be a first target band signal B1, a second target band signal B2 and a third target band signal B3.

[0113] The stopband of one of the output channels of the first duplexer 12 covers the target band signal in the fourth high frequency band, and the passband covers the target band signals in the third low frequency band;

[0114] The stopband of another output channel of the first duplexer 12 covers each target band signal in the third low frequency band, and the passband covers each target band signal in the fourth high frequency band.

[0115] To avoid interference caused by filters operating in different frequency bands and improve the performance of the overall multiplexer 10, please refer to Fig. 9 , Fig. 9 The oscilloscope curve of the first duplexer in the third embodiment is shown. In the present embodiment, one of the output channels of the first duplexer 12, namely the low-frequency channel, is used to output the third low-frequency band, namely the corresponding passband needs to cover the first target band signal B1, the second target band signal B2 and the third target band signal B3; at the same time, the stopband needs to cover the fourth target band signal B4.

[0116] Correspondingly, another output channel of the first duplexer 12 in this embodiment, i.e., the high-frequency channel, is used to output the fourth high-frequency band, and the corresponding stopband needs to cover the frequency bands corresponding to the first target band signal B1, the second target band signal B2, and the third target band signal B3, while the corresponding passband needs to cover the frequency band corresponding to the fourth target band signal B4.

[0117] In this embodiment, the second duplexer 13 is used to divide the third low frequency band into the first target band signal B1 and the fourth low frequency band, and the first target band signal is output through another output channel of the second duplexer 13. The fourth low frequency band is a frequency band including the second target band signal B2 and the third target band signal B3.

[0118] One of the output channels of the second duplexer 13, namely the low-frequency channel, has a stopband covering the first target band signal B1 and a passband covering the target band signals in the fourth low-frequency band, namely the second target band signal B2 and the third target band signal B3; the other output channel of the second duplexer 13, namely the high-frequency channel, has a stopband covering the target band signals in the fourth low-frequency band and a passband covering the first target band signal B1.

[0119] The third duplexer 14 is used to divide the fourth low frequency band into a second target band signal B2 and a third target band signal B3.

[0120] Among them, one of the output channels of the third duplexer 14, namely the high-frequency channel, has a stopband covering the second target band signal B2 and a passband covering the third target band signal B3; another output channel of the third duplexer 14, namely the low-frequency channel, has a stopband covering the third target band signal B3 and a passband covering the second target band signal B2.

[0121] Please refer to Fig.10 , Fig.10 The simulation results of the multiplexer in the third embodiment are shown, wherein dB(S(2,1)), dB(S(3,1)), dB(S(4,1)) and dB(S(5,1)) correspond to the first target band signal B1, the second target band signal B2, the third target band signal B3 and the fourth target band signal B4, respectively. It can be seen that the target band signals obtained by the multiplexer in the present embodiment have a higher degree of suppression.

[0122] In summary, this embodiment provides a multiplexer, including multiple duplexers, each duplexer is cascaded, and for two adjacent duplexers, the current duplexer is used to divide the signal to be transmitted into a low-frequency band and a high-frequency band; the next duplexer is used to divide the target band signal from the low-frequency band and / or the high-frequency band; wherein the low-frequency band and / or the high-frequency band corresponding to the output channel of the current duplexer covers the working frequency band of the next duplexer. Based on this, a multiplexer and RF front-end module provided by the present invention can reduce the circuit area and design complexity by integrating or designing multiple duplexer structures, while avoiding the interference generated when the filter works in different frequency bands, thereby improving the suppression performance of the overall multiplexer.

[0123] In the second aspect, the present invention also provides a radio frequency front-end module, including the multiplexer described in any one of the first aspects above, and then by integrating or designing multiple duplexer structures, it can reduce the circuit area and design complexity while avoiding the interference caused by the filter operating in different frequency bands, thereby improving the overall suppression performance.

[0124] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0125] In addition, the functional modules in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0126] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multiplexer, characterized in that: It comprises a plurality of duplexers, each of which is cascaded, and for two adjacent duplexers, the current duplexer is used to divide the signal to be transmitted into a low-frequency band and a high-frequency band; the next duplexer is used to divide the target band signal from the low-frequency band and / or the high-frequency band; The low-frequency band and / or high-frequency band corresponding to the output channel of the current-stage duplexer covers the working frequency band of the next-stage duplexer.

2. The multiplexer according to claim 1, characterized in that: When the multiplexer includes N output channels, the number of the duplexers satisfies: N-1, where N is a positive integer greater than 1.

3. The multiplexer according to claim 1 or 2, characterized in that: When the multiplexer includes four output channels, the multiplexer outputs four target band signals from the signal to be transmitted through the four output channels, and when the multiplexer includes a first duplexer, a second duplexer and a third duplexer, two output channels of the first duplexer are connected to a receiving channel of the second duplexer and a receiving channel of the third duplexer, respectively; The first duplexer is used to divide the signal to be transmitted into a first low-frequency band and a first high-frequency band; the first low-frequency band includes at least two target band signals; the first high-frequency band includes at least two target band signals; wherein the frequencies corresponding to the target band signals in the first low-frequency band and the first high-frequency band are different; The stopband of one of the output channels of the first duplexer covers each target band signal in the first low frequency band, and the passband covers each target band signal in the first high frequency band; And / or the stopband of another output channel of the first duplexer covers each target band signal in the first high frequency band, and the passband covers each target band signal in the first low frequency band.

4. The multiplexer according to claim 3, characterized in that: The first low-frequency band includes a first target band signal and a second target band signal; the first high-frequency band includes a third target band signal and a fourth target band signal; and when the frequencies of the first target band signal, the second target band signal, the third target band signal and the fourth target band signal increase in sequence, The second duplexer or the third duplexer is used to divide the first low-frequency band into a first target band signal and a second target band signal; The stopband of one output channel of the second duplexer or the third duplexer covers the second target band signal, the third target band signal and the fourth target band signal, and the passband covers the first target band signal; And / or the stopband of another output channel of the second duplexer or the third duplexer covers the first target band signal, the third target band signal and the fourth target band signal, and the passband covers the second target band signal.

5. The multiplexer according to claim 3, characterized in that: The first low-frequency band includes a first target band signal and a second target band signal; the first high-frequency band includes a third target band signal and a fourth target band signal; wherein, when the frequencies of the first target band signal, the second target band signal, the third target band signal and the fourth target band signal increase in sequence, The second duplexer or the third duplexer is used to divide the first high-frequency band into a third target band signal and a fourth target band signal; The stopband of one output channel of the second duplexer or the third duplexer covers the first target band signal, the second target band signal and the fourth target band signal, and the passband covers the third target band signal; And / or the stopband of another output channel of the second duplexer or the third duplexer covers the first target band signal, the second target band signal and the third target band signal, and the passband covers the fourth target band signal.

6. The multiplexer according to claim 1 or 2, characterized in that: When the multiplexer includes four output channels, the multiplexer outputs four target band signals from the signal to be transmitted through the four output channels, and when the multiplexer includes a first duplexer, a second duplexer and a third duplexer, one of the output channels of the first duplexer is connected to a receiving channel of the second duplexer, and one of the output channels of the second duplexer is connected to a receiving channel of the third duplexer; The first duplexer is used to divide the signal to be transmitted into a second low-frequency band and a second high-frequency band; the second low-frequency band includes a target band signal; the second high-frequency band includes at least three target band signals; wherein the frequencies corresponding to the target band signals in the second low-frequency band and the second high-frequency band are different; The stopband of one of the output channels of the first duplexer covers the target band signal in the second low frequency band, and the passband covers each target band signal in the second high frequency band; The stopband of another output channel of the first duplexer covers each target band signal in the second high frequency band, and the passband covers the target band signal in the second low frequency band.

7. The multiplexer according to claim 6, characterized in that: The second high frequency band includes a second target band signal, a third target band signal and a fourth target band; the second low frequency band includes a first target band signal, and when the frequencies of the first target band signal, the second target band signal, the third target band signal and the fourth target band signal increase in sequence, The second duplexer is used to divide the second high-frequency band into a second target band signal and a third high-frequency band, and the second target band signal is output through one of the output channels of the second duplexer; The stopband of one of the output channels of the second duplexer covers the target band signals in the third high-frequency band, and the passband covers the second target band signals; the stopband of another output channel of the second duplexer covers the second target band signals, and the passband covers the target band signals in the third high-frequency band; The third duplexer is used to divide the third high frequency band into a third target band signal and a fourth target band signal; Among them, the stopband of one output channel of the third duplexer covers the third target band signal, and the passband covers the fourth target band signal; the stopband of another output channel of the third duplexer covers the fourth target band signal, and the passband covers the third target band signal.

8. The multiplexer according to claim 1 or 2, characterized in that: When the multiplexer includes four output channels, the multiplexer outputs four target band signals from the signal to be transmitted through the four output channels, and when the multiplexer includes a first duplexer, a second duplexer and a third duplexer, one of the output channels of the first duplexer is connected to a receiving channel of the second duplexer, and one of the output channels of the second duplexer is connected to a receiving channel of the third duplexer; The first duplexer is used to divide the signal to be transmitted into a third low-frequency band and a fourth high-frequency band; the third low-frequency band includes at least three target band signals; the fourth high-frequency band includes one target band signal; wherein the frequencies corresponding to the target band signals in the third low-frequency band and the fourth high-frequency band are different; Wherein, the stopband of one of the output channels of the first duplexer covers the target band signal in the fourth high frequency band, and the passband covers the target band signals in the third low frequency band; The stopband of another output channel of the first duplexer covers each target band signal in the third low frequency band, and the passband covers each target band signal in the fourth high frequency band.

9. The multiplexer according to claim 8, characterized in that: The third low frequency band includes a first target band signal, a second target band signal, and a third target band, and the fourth high frequency band includes a fourth target band signal, and when the frequencies of the first target band signal, the second target band signal, the third target band signal, and the fourth target band signal increase in sequence, The second duplexer is used to divide the third low-frequency band into a first target band signal and a fourth low-frequency band, and the first target band signal is output through another output channel of the second duplexer; The stopband of one output channel of the second duplexer covers the first target band signal, and the passband covers each target band signal in the fourth low frequency band; the stopband of another output channel of the second duplexer covers each target band signal in the fourth low frequency band, and the passband covers the first target band signal; The third duplexer is used to divide the fourth low-frequency band into a second target band signal and a third target band signal; Among them, the stopband of one output channel of the third duplexer covers the second target band signal, and the passband covers the third target band signal; the stopband of another output channel of the third duplexer covers the third target band signal, and the passband covers the second target band signal.

10. A radio frequency front-end module, characterized in that: A multiplexer comprising the multiplexer according to any one of claims 1 to 9.

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