Multiplexer and communication equipment

Abstract

The invention provides a multiplexer and communication equipment, and relates to the technical field of filtering. The multiplexer at least comprises a sending channel, a receiving channel and a common end, and the receiving channel and the sending channel share the common end so as to send or receive a transmission signal through the common end; the sending channel comprises a plurality of series resonance units and parallel resonance units, the parallel resonance units are sequentially arranged on connection points of the series resonance units and the grounding end, and the series resonance units and / or the parallel resonance units comprise target resonance units closest to the common end; wherein the target resonance unit comprises a plurality of parallel branches, each parallel branch comprises at least one resonator, and the resonators on each parallel branch are arranged in a cascading manner, so that the phase difference current is generated through each parallel branch, the generated high-order signals have the phase difference, vector superposition is carried out during final output, and the high-order signals are obtained. Therefore, the intermodulation signal is weakened to a certain extent, the signal quality is improved, and the method has high applicability.

Description

Technical Field

[0001] The present invention relates to the field of filtering technology, and in particular to a multiplexer and communication equipment. Background Art

[0002] With the development of 5G communications, spectrum resources have become increasingly precious. With limited spectrum resources, the network rate is usually increased by increasing the modulation depth, reducing signal crosstalk, and increasing the communication bandwidth. However, the modulation depth is related to the coding method. As the modulation order increases, the probability of errors in encryption and decoding increases. At the same time, increasing the communication bandwidth will increase the waste of spectrum resources. Based on this, the signal quality is often improved by reducing signal crosstalk. Generally, the network rate can be improved by optimizing the performance of the RF front-end devices.

[0003] For RF front-end devices, most devices have intermodulation effects, such as active devices such as power amplifiers, low noise amplifiers, and RF switches required to form RF front-end circuits. The intermodulation effect generation mechanism of active devices is relatively complex. For example, it can be the high-order nonlinear signals generated by the device itself at high power and high temperature and the input signal. The above signals will generate more nonlinear harmonics. Filters and multiplexers, as the first stage of the receiving and the last stage of the transmitting link, are used to perform nonlinear processing on the signals on the entire link, filter out the intermodulation signals generated by other active devices, and make the nonlinear signals of the entire link only come from the filter or duplexer itself to improve the signal quality.

[0004] Currently, the nonlinear effects of filters and multiplexers are mostly adjusted by disposing non-magnetic metal on electrodes and / or increasing the resonator area. However, the above methods are not ideal.

[0005] Based on this, there is an urgent need for a solution to improve the intermodulation effect of a duplexer or a multiplexer to enhance signal quality. Summary of the invention

[0006] In view of this, an object of the present invention is to provide a multiplexer and a communication device, which can improve the intermodulation effect of a duplexer or a multiplexer and enhance signal quality.

[0007] In order to achieve the above purpose, the technical solution adopted by the embodiment of the present invention is as follows: In a first aspect, the present invention provides a multiplexer, the multiplexer at least comprising a transmitting channel, a receiving channel, and a common end, the receiving channel and the transmitting channel share the common end, so as to send or receive a transmission signal through the common end; the transmitting channel comprises a plurality of series resonance units and a plurality of parallel resonance units, each parallel resonance unit is sequentially arranged at a connection point between each series resonance unit and a ground end, and the series resonance unit and / or the parallel resonance unit both comprise a target resonance unit closest to the common end; The target resonance unit includes a plurality of parallel branches, each of which includes at least one resonator. When a plurality of resonators are included, the resonators in each parallel branch are cascaded.

[0008] Optionally, the capacitance value and the resonant frequency between the resonators in any parallel branch are the same.

[0009] Optionally, the series resonance unit closest to the common end is used as the first target resonance unit, and the first target resonance unit includes a plurality of first parallel branches, and the capacitance values ​​and resonance frequencies of the first parallel branches are different.

[0010] Optionally, the resonant frequency of each first parallel branch is between the passband frequencies of the transmission channel; and the difference between the resonant frequency of any first parallel branch and the average resonant frequency of the first target resonant unit satisfies a preset range.

[0011] Optionally, for the first parallel branch with the largest capacitance value in the first target resonance unit, its capacitance value is equal to the sum of the capacitance values ​​of the other first parallel branches.

[0012] Optionally, the total number of first parallel branches under the first target resonance unit is less than or equal to 5.

[0013] Optionally, the parallel resonance unit closest to the common end is used as the second target resonance unit, and the second target resonance unit includes multiple second parallel branches, and the resonance frequency of each second parallel branch is lower than the lower cutoff frequency of the transmitting channel; and the difference between the resonance frequency of any second parallel branch and the average resonance frequency of the second target resonance unit satisfies a preset range.

[0014] Optionally, the second parallel branch includes a first target branch and a second target branch, the first target branch is used to represent the second parallel branch closest to the common terminal; the second target branch is used to represent the second parallel branch farthest from the common terminal; The capacitance value of each second parallel branch increases step by step with the first target branch to the second target branch as the preset direction.

[0015] Optionally, the total number of second parallel branches under the second target resonance unit is less than or equal to 4.

[0016] In a second aspect, the present invention provides a communication device, comprising the multiplexer described in any one of the first aspects above.

[0017] The multiplexer and communication device provided by the embodiments of the present invention have the following beneficial effects: The present invention provides a multiplexer, which at least includes a transmitting channel, a receiving channel, and a common end. The receiving channel and the transmitting channel share the common end so as to send or receive a transmission signal through the common end; the transmitting channel includes a plurality of series resonance units and parallel resonance units, each of which is sequentially arranged at a connection point between each series resonance unit and a ground end, and the series resonance unit and / or the parallel resonance unit both include a target resonance unit closest to the common end; wherein the target resonance unit includes a plurality of parallel branches, each of which includes at least one resonator, and the resonators on each parallel branch are cascaded. Based on this, the present invention generates a phase difference current through each parallel branch so that the generated high-order signal has a phase difference, so as to perform vector superposition at the final output, so that the signal amplitude thereof will be much smaller than the sum of multiple currents of the same phase, thereby achieving the weakening of the intermodulation signal to a certain extent, improving the signal quality, improving the intermodulation effect of the duplexer or multiplexer, achieving a lower nonlinear effect, and having strong applicability.

[0018] 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

[0019] 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.

[0020] Figure 1 The nonlinear intermodulation signal generated by a typical two-way transmitting end in the prior art is shown; Figure 2 One of the module schematic diagrams of the multiplexer provided by an embodiment of the present invention is shown; Figure 3 A schematic diagram of a module of a target resonance unit provided by an embodiment of the present invention is shown; Figure 4 A schematic diagram of a module of a sending channel provided by an embodiment of the present invention is shown; Figure 5 A schematic diagram of a module of a first target resonance unit provided by an embodiment of the present invention is shown; Figure 6 A schematic diagram of a module of a second target resonance unit provided in an embodiment of the present invention is shown; Figure 7 The second schematic diagram of the module of the multiplexer provided by the embodiment of the present invention is shown; Figure 8 The test architecture of the multiplexer provided by the embodiment of the present invention is shown; Fig. 9 The test results of the duplexer in the embodiment of the present invention are shown.

[0021] Icon: 10-multiplexer; 101-transmitting channel; 102-receiving channel; 10-A-common end; 201-series resonance unit; 202-parallel resonance unit; 203-target resonance unit; 301-parallel branch; 302-resonator; 201-a-first series resonance unit; 201-b-second series resonance unit; 201-c-third series resonance unit; 202-a-first parallel resonance unit; 202-b-second parallel resonance unit; 203-a-first target resonance unit; 203-b-second target resonance unit. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] 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.

[0025] Take a multiplexer with two transmission channels as an example. The transmission channel of one multiplexer is in the high frequency band and the receiving channel is in the low frequency band. When two high-power signals are input to the transmission channel at the same time, for example, the first input signal f 1 , the second input signal f 0Due to the nonlinear effect, higher-order signals will be generated, such as the first higher-order signal n*f 0 , the second highest signal n*f 1 , where n is a positive integer. At this time, the first input signal f 1 , the second input signal f 0 , the first high-order signal n*f 0 and the second highest signal n*f 1 It will be due to intermodulation effect, please refer to Figure 1 , Figure 1 The figure shows a typical nonlinear intermodulation signal generated by two transmitting ends in the prior art. The intermodulation signal appears at 2f of the transmitting channel (TX). 1 -f 0 frequency band, and the receiving channel (RX) 2f 0 -f 1 In the frequency band, the intermodulation signal can be expressed as: n* f 0 ±m*f 1 However, since the receiving channel corresponds to the low-frequency signal, the received signal itself has a weak signal strength, and the generated intermodulation signal will greatly interfere with the received signal.

[0026] Currently, the nonlinear effects of filters and multiplexers are mostly adjusted by disposing non-magnetic metal on electrodes and / or increasing the resonator area. However, the above methods are not ideal.

[0027] Based on this, the present invention provides a solution for improving the intermodulation effect of a duplexer or a multiplexer to enhance signal quality.

[0028] Please refer to Figure 2 , Figure 2 The module structure diagram of the multiplexer in the embodiment of the present invention is shown, and the multiplexer 10 at least includes a transmitting channel 101, a receiving channel 102, and a common terminal 10-A. The receiving channel 102 and the transmitting channel 101 share the common terminal 10-A to send or receive a transmission signal through the common terminal 10-A, wherein the TIN terminal is the input terminal of the transmitting channel 101, and the ROT terminal is the output terminal corresponding to the receiving channel 102. The transmitting channel 101 includes a plurality of series resonance units 201 and a plurality of parallel resonance units 202, and each parallel resonance unit 202 is sequentially arranged at the connection point between each series resonance unit 201 and the ground terminal. The series resonance unit and / or the parallel resonance unit both include a target resonance unit closest to the common terminal.

[0029] Among them, please Figure 2 Based on the reference Figure 3 , Figure 3The module structure diagram of the target resonance unit in the embodiment of the present invention is shown. The target resonance unit 203 includes a plurality of parallel branches 301. Each parallel branch 301 includes at least one resonator 302. The resonators 302 on each parallel branch 301 are cascaded.

[0030] In this embodiment, the multiplexer includes a transmitting channel and a receiving channel, and each transmitting channel and receiving channel shares a common end, wherein the common end may be an antenna port (Antenna Port-ANT), so as to send or receive a transmission signal through the ANT port. Taking the working mode of the transmitting channel as an example, the signal may be input from the input port of the transmitting channel and output from the antenna port. The transmitting channel includes a plurality of series resonant units and parallel resonant units, and each parallel resonant unit is sequentially arranged at the connection point between each series resonant unit and the ground terminal, wherein the target resonant unit closest to the common end in the series resonant unit and / or the parallel resonant unit includes a plurality of parallel branches, each parallel branch includes at least one resonator, and when multiple resonators are included, each resonator on each parallel branch is cascaded, and a phase difference current is generated through each parallel branch, so that the generated high-order signal has a phase difference, so as to perform vector superposition at the final output, so that its signal amplitude will be much smaller than the sum of multiple currents of the same phase, thereby achieving a certain degree of weakening of the intermodulation signal and improving the signal quality.

[0031] It should be noted that this embodiment does not limit the number of sending channels and receiving channels. Figure 2 , Figure 3 The structure of the multiplexer is merely exemplified, that is, the sending channel and / or receiving channel of the multiplexer in this embodiment may be one channel, two channels or multiple channels.

[0032] In addition, this embodiment does not limit the number of parallel branches in the transmitting channel, nor does it limit the number of resonators in any parallel branch. The capacitance value and resonant frequency between the resonators in any parallel branch are the same to ensure that the phase change and resonant frequency change of each parallel branch are consistent.

[0033] When each parallel resonant unit is sequentially arranged at the connection point between each series resonant unit and the ground terminal, the closer the series resonant unit and / or parallel resonant unit on the transmission channel is to the common terminal (for example, the antenna port), the greater the intermodulation effect on the signal link of the transmission channel.

[0034] First embodiment When the multiplexer in this embodiment is a duplexer, that is, it includes one transmission channel and one reception channel, please refer to Figure 4 , Figure 4The module structure diagram of the transmission channel in the embodiment of the present invention is shown, when the transmission channel includes three series resonance units and two parallel resonance units, and they are respectively represented as the first series resonance unit 201-a, the second series resonance unit 201-b, the third series resonance unit 201-c, the first parallel resonance unit 202-a, and the second parallel resonance unit 202-b, wherein the first series resonance unit 201-a, the second series resonance unit 201-b, and the third series resonance unit 201-c are arranged in cascade, the first end of the first parallel resonance unit 202-a is connected to the connection point of the first series resonance unit 201-a and the second series resonance unit 201-b, and the second end is grounded, that is, the first series resonance unit 201-a is grounded through the first parallel resonance unit 202-a. The first end of the second parallel resonance unit 202-b is connected to the connection point of the second series resonance unit 201-b and the third series resonance unit 201-c, and the second end is grounded, that is, the second series resonance unit 201-b is grounded through the second parallel resonance unit 202-b.

[0035] Among them, under the above-mentioned transmitting structure example, the contribution order of the intermodulation influence satisfies: the first series resonance unit 201-a> the first parallel resonance unit 202-a> the second series resonance unit 201-b> the second parallel resonance unit 202-b> the third series resonance unit 201-c.

[0036] In this embodiment, the intermodulation effect interference can be greatly reduced by adjusting the structure of the first series resonance unit and / or the first parallel resonance unit.

[0037] When the series resonance unit closest to the common end, that is, the first series resonance unit, is used as the first target resonance unit, the first target resonance unit 203 - a includes multiple first parallel branches, and the capacitance values ​​and resonance frequencies of the first parallel branches are different.

[0038] For example, in Figure 4 Based on the reference Figure 5 , Figure 5 The module structure diagram of the first target resonance unit in the embodiment of the present invention is shown, with the first series resonance unit as the first target resonance unit 203-a on the transmission channel 101, and the first target resonance unit 203-a includes a plurality of first parallel branches arranged in parallel, and when the total number of the first parallel branches is n, each first parallel branch can be represented as S1-1 to S1-n, respectively. m resonators 302 are cascaded on each first parallel branch.

[0039] When the total number of first parallel branches is 3, each first parallel branch is represented as S1-1, S1-2 and S1-3 respectively; correspondingly, S1-c1≠S1-c2≠S1-c3; S1-f1≠S1-f2≠S1-f3; the above S1-c1, S1-c2 and S1-c3 are represented as the capacitance values ​​corresponding to S1-1, S1-2 and S1-3 respectively; the above S1-f1, S1-f2 and S1-f3 are represented as the resonant frequencies corresponding to S1-1, S1-2 and S1-3 respectively.

[0040] Among them, the resonant frequency of each first parallel branch is between the passband frequencies of the transmission channel; and the difference between the resonant frequency of any first parallel branch and the average resonant frequency of the first target resonant unit satisfies a preset range.

[0041] In order to adjust the intermodulation effect of the corresponding resonant unit, the resonant frequency of each first parallel branch in this embodiment is between the passband frequencies of the transmission channel; for example, assuming that the passband frequency of the transmission channel satisfies: [f L , f H ], where f L is the lower cutoff frequency, f H is the upper cutoff frequency, and it is assumed that the mean value of the resonance frequency of the first target resonance unit 203-a is represented by S1_fe; taking S1-f1 as an example, its value satisfies: f L <S1-f1<f H , |S1-f1-S1_fe|=a, that is, it satisfies: [S1_fe-a, S1_fe+a]. When a is 1%, S1-f1 is in the range of [0.99* S1_fe, 1.01*S1_fe].

[0042] In this embodiment, the calculation method of the mean value of the resonance frequency of the first target resonance unit satisfies: the sum of the resonance frequencies corresponding to the first parallel branches under the first target resonance unit is divided by the total number of the second parallel branches under the first target resonance unit.

[0043] It should be noted that in order to avoid a significant impact on the passband insertion loss, the preset range can fluctuate slightly around 1%.

[0044] In this embodiment, in order to ensure the resistance loss of the transmission channel, the total number of the first parallel branches under the first target resonance unit is less than or equal to 5, that is, the total number satisfies: n≤5.

[0045] Among them, when the capacitance values ​​between the first parallel branches under the first target resonance unit are different, in order to ensure the intermodulation effect adjustment effect of the transmission channel, the vector superposition principle can be used to improve the overall current amplitude. In this embodiment, the capacitance value of the first parallel branch with the largest capacitance value in the first target resonance unit can be equal to the sum of the capacitance values ​​between the remaining first parallel branches.

[0046] Based on this, when the generated high-order current passes through the first parallel branches corresponding to different capacitance values, different phases will be generated. At the same time, when the capacitance value of the first parallel branch with the largest capacitance value is equal to the sum of the capacitance values ​​between the remaining first parallel branches, taking the first target resonant unit including three first parallel branches as an example, the current generated by each first parallel branch satisfies in sequence: I 1 *cosα1,I 2 *cosα2,I 3 *cosα3. Wherein, cosα1, cosα2 and cosα3 correspond to the phase values ​​of the above three first parallel branches respectively. 1 ,I 2 and I 3 The corresponding divided currents of the three first parallel branches are respectively corresponding to the above-mentioned total current corresponding to the first target resonance unit 203-a is expressed as: I= I 1 *cosα1+I 2 *cosα2+I 3 *cosα3. Due to the phase difference between the phase angles, the total amplitude is less than I 1 +I 2 +I 3 Therefore, when outputting to the antenna port (common end), each series resonant unit and / or parallel resonant unit is vector-superimposed, ultimately ensuring that the overall current amplitude is improved to a certain extent.

[0047] Similar to the previous embodiment, in this embodiment, the parallel resonance unit closest to the common end is used as the second target resonance unit 203-b, and the second target resonance unit 203-b includes multiple second parallel branches, and the resonance frequency of each second parallel branch is lower than the lower cutoff frequency of the transmitting channel; and the difference between the resonance frequency of any second parallel branch and the average resonance frequency of the second target resonance unit satisfies the preset range.

[0048] exist Figure 4 Based on Figure 6 , Figure 6The module structure diagram of the second target resonance unit 203-b in the embodiment of the present invention is shown. In this embodiment, the first parallel resonance unit 202-a is used as the second target resonance unit 203-b, and the second target resonance unit 203-b includes multiple second parallel branches. When the total number of second parallel branches is n, each second parallel branch can be represented as P1-1 to P1-n, P1-1 is the first parallel branch closest to the common end (or the first series resonance unit 201-a), and P1-n is the second parallel branch farthest from the common end (or closest to the second series resonance unit 201-b). m resonators 302 are arranged on each second parallel branch, and each resonator 302 is arranged in cascade. Each resonator 302 is used to share the average current of each second parallel branch, and the resonant frequency and capacitance size corresponding to the resonator 302 on each second parallel branch are kept consistent to reduce the capacitance change of each second parallel branch and reduce the impact on the passband insertion loss.

[0049] When the total number of second parallel branches is 3, each second parallel branch can be represented as P1-1, P1-2 and P1-3, respectively. Correspondingly, P1-c1≠P1-c2≠P1-c3; P1-f1≠P1-f2≠P1-f3; the above P1-c1, P1-c2 and P1-c3 are respectively represented as the capacitance values ​​corresponding to P1-1, P1-2 and P1-3; the above P1-f1, P1-f2 and P1-f3 are respectively represented as the resonant frequencies corresponding to P1-1, P1-2 and P1-3.

[0050] In order to adjust the intermodulation effect of the corresponding resonant unit, the resonant frequency of each second parallel branch in this embodiment is lower than the lower cutoff frequency of the transmission channel, and the difference between the resonant frequency of any second parallel branch and the mean resonant frequency of the second target resonant unit 203-b satisfies the preset range. When the mean resonant frequency of the second target resonant unit 203-b is expressed as P1_fe; taking S1-f1 as an example, its numerical value satisfies: Taking P1-f1 as an example, its numerical value satisfies: P1-f1 <f L , and |P1-f1-P1_fe|=a, that is, it satisfies: [P1_fe-a, P1_fe+a]. When the corresponding proportion of a is 1%, P1-f1 is in the range of [0.99*P1_fe, 1.01*P1_fe].

[0051] In this embodiment, the mean resonant frequency of the second target resonance unit 203-b is the sum of the resonant frequencies corresponding to the second parallel branches under the second target resonance unit 203-b divided by the total number of the second parallel branches under the second target resonance unit 203-b.

[0052] Among them, the second parallel branch includes a first target branch and a second target branch, the first target branch is used to characterize the second parallel branch closest to the common end; the second target branch is used to characterize the second parallel branch farthest from the common end; that is, the above-mentioned P1-1 and P1-n. In this embodiment, from P1-1 to P1-n is a preset direction, and the capacitance value of each second target branch increases step by step, wherein the capacitance value of the first target branch is the smallest and the capacitance value of the second target branch is the largest, which can filter out the nonlinear signal generated by the previous stage more thoroughly and reduce the intermodulation effect at the common port.

[0053] In this embodiment, in order to ensure the resistance loss of the transmission channel, the total number of the second parallel branches under the second target resonance unit 203-b is less than or equal to 4, that is, the total number satisfies: n≤4.

[0054] Second embodiment Similar to the previous embodiment, when the multiplexer in this embodiment is a quad-multiplexer, that is, including two transmission channels and two receiving channels, please refer to Figure 7 , Figure 7 A schematic diagram of the structure of the transmitting channel in an embodiment of the present invention is shown, wherein the quadplexer includes 5 ports, which are respectively represented as ROT1, ROT2, TIN1, TIN2 and ANT, wherein ROT1 and ROT2 are the output ports of the two receiving channels, respectively, and TIN1 and TIN2 are the input ports of the two transmitting channels, respectively, wherein any transmitting channel 101 includes three series resonance units and two parallel resonance units, which are respectively represented as a first series resonance unit 201-a, a second series resonance unit 201-b, a third series resonance unit 201-c, a first parallel resonance unit 202-a, and a second parallel resonance unit 202-b, wherein, The first series resonant unit 201-a, the second series resonant unit 201-b, and the third series resonant unit 201-c are arranged in cascade, and the first end of the first parallel resonant unit 202-a is connected to the connection point of the first series resonant unit 201-a and the second series resonant unit 201-b, and the second end is grounded, that is, the first series resonant unit 201-a is grounded through the first parallel resonant unit 202-a. The first end of the second parallel resonant unit 202-b is connected to the connection point of the second series resonant unit 201-b and the third series resonant unit 201-c, and the second end is grounded, that is, the second series resonant unit 201-b is grounded through the second parallel resonant unit 202-b.

[0055] Among them, the first series resonance unit 201-a and the first parallel resonance unit 202-a closest to the common port are adjusted in the same way as in the previous embodiment, which will not be repeated here.

[0056] Third embodiment For a duplexer, a quadplexer, or even a multiplexer, when the receiving channel 102 includes a plurality of series resonant units 201 and parallel resonant units 202, and each parallel resonant unit 202 is sequentially arranged at a connection point between each series resonant unit 201 and the ground terminal, the series resonant unit 201 closest to the common port in the receiving channel 102 may also adopt the same adjustment method as in the first embodiment to optimize the nonlinear effects of the filter and the multiplexer, which will not be described in detail here.

[0057] In addition, please refer to Figure 8 , Figure 8 The test structure of a multiplexer provided in this embodiment is shown. The test structure includes at least two signal generators, a power amplifier (PA), a low-pass filter, a combiner, a low intermodulation bandpass filter and a multiplexer. The test principle is: two signal generators, generating a frequency of f 0 and f 1 The signal, the above frequency is f 0 and f 1 The signals are amplified by the PA on the corresponding output link and then pass through the 0 and f 1 The low-pass filter is used to filter out the nonlinear signal generated by the PA, and then enters the combiner to generate a signal that passes through the low intermodulation bandpass filter and enters the multiplexer. The antenna port of the multiplexer is matched with a matching load, and finally enters the output link from the receiving channel of the multiplexer. Finally, it is received by the spectrum analyzer or power meter, and the intermodulation signal strength of the multiplexer under the action of the two signals is read.

[0058] Please refer to Fig. 9 , Fig. 9 The test results of the multiplexer in this embodiment are shown. It can be seen that when the power of the two high-power signals f is 24dBm, 1 and f 0 Under input, a -75dBm third-order intermodulation (IMD3) signal level can be obtained from the receiving port, so the intermodulation can reach an intermodulation depth of 99dBc (24dBm+75dBm), and for the fifth-order intermodulation (IIMD5) signal level, its depth can reach 144dBc (24dBm+120dBm), which can meet the use of most small base stations and has broad application prospects in future high-performance communications.

[0059] In summary, the present invention provides a multiplexer, which at least includes a transmitting channel, a receiving channel, and a common end, and the receiving channel and the transmitting channel share the common end to send or receive a transmission signal through the common end; the transmitting channel includes a plurality of series resonance units and parallel resonance units, and each parallel resonance unit is sequentially arranged at a connection point between each series resonance unit and a ground end, and the series resonance unit and / or the parallel resonance unit both include a target resonance unit closest to the common end; wherein the target resonance unit includes a plurality of parallel branches, each parallel branch includes at least one resonator, and the resonators on each parallel branch are cascaded. Based on this, the present invention generates a phase difference current through each parallel branch, so that the generated high-order signal has a phase difference, so as to perform vector superposition at the final output, so that its signal amplitude will be much smaller than the sum of multiple currents of the same phase, thereby achieving a certain degree of weakening of the intermodulation signal, improving the signal quality, improving the intermodulation effect of the duplexer or multiplexer, achieving a lower nonlinear effect, and having strong applicability.

[0060] In a second aspect, the present invention provides a communication device, including the multiplexer described in any one of the first aspects above, which can improve the intermodulation effect of the duplexer or multiplexer, achieve lower nonlinear effects, improve signal quality, and has strong applicability.

[0061] In several embodiments provided in the present application, it should be understood that in some alternative implementations, the functions marked in the blocks may also occur in an order different from that marked in the accompanying drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flow chart, and the combination of blocks in the block diagram and / or flow chart, may be implemented with a dedicated hardware-based system that performs a specified function or action, or may be implemented with a combination of dedicated hardware and computer instructions.

[0062] 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.

[0063] 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, the multiplexer comprising at least a sending channel, a receiving channel, and a common end, the receiving channel and the sending channel share the common end, so as to send or receive a transmission signal through the common end, characterized in that: The transmission channel includes a plurality of series resonance units and a plurality of parallel resonance units, each of the parallel resonance units is sequentially arranged at a connection point between each of the series resonance units and a ground terminal, and each of the series resonance units and / or the parallel resonance units includes a target resonance unit closest to the common terminal; The target resonance unit includes a plurality of parallel branches, each of which includes at least one resonator. When a plurality of resonators are included, the resonators in each parallel branch are cascaded.

2. The multiplexer according to claim 1, characterized in that: The capacitance value and the resonance frequency between the resonators in any parallel branch are the same.

3. The multiplexer according to claim 1 or 2, characterized in that: The series resonance unit closest to the common end is used as a first target resonance unit, wherein the first target resonance unit includes a plurality of first parallel branches, and the capacitance values ​​and resonance frequencies of the first parallel branches are different.

4. The multiplexer according to claim 3, characterized in that: The resonant frequency of each of the first parallel branches is between the passband frequencies of the transmission channel; and the difference between the resonant frequency of any of the first parallel branches and the average resonant frequency of the first target resonant unit satisfies a preset range.

5. The multiplexer according to claim 4, characterized in that: For the first parallel branch with the largest capacitance in the first target resonance unit, its capacitance is equal to the sum of the capacitances of the other first parallel branches.

6. The multiplexer according to claim 4, characterized in that: The total number of first parallel branches under the first target resonance unit is less than or equal to 5.

7. The multiplexer according to claim 3, characterized in that: The parallel resonance unit closest to the common end is used as the second target resonance unit, and the second target resonance unit includes multiple second parallel branches, and the resonance frequency of each of the second parallel branches is lower than the lower cutoff frequency of the transmitting channel; and the difference between the resonance frequency of any second parallel branch and the average resonance frequency of the second target resonance unit satisfies a preset range.

8. The multiplexer according to claim 7, characterized in that: The second parallel branch includes a first target branch and a second target branch, wherein the first target branch is used to represent the second parallel branch closest to the common terminal; and the second target branch is used to represent the second parallel branch farthest from the common terminal; The capacitance value of each of the second parallel branches increases step by step with the first target branch to the second target branch as the preset direction.

9. The multiplexer according to claim 7, characterized in that: The total number of second parallel branches under the second target resonance unit is less than or equal to 4.

10. A communication device, characterized in that: A multiplexer comprising the multiplexer according to any one of claims 1 to 9.

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