Multiplexer and radio frequency front end module

Abstract

The application discloses a multiplexer and a radio frequency front end module, and relates to the technical field of radio frequency filtering. The multiplexer comprises an antenna port, receiving resonators, first transmitting resonators, a first matching circuit and a second matching circuit. A plurality of receiving resonators are arranged between a first common node and a receiving port. A plurality of first transmitting resonators are arranged between the antenna port and a first transmitting port. The first matching circuit is connected in series between the first common node and the antenna port, and the first matching circuit is arranged in series with the receiving resonators. One end of the second matching circuit is connected to the antenna port, and the other end of the second matching circuit is grounded. The second matching circuit is arranged in parallel with the first transmitting resonators, and the first matching circuit is different from the second matching circuit. The application can effectively reduce the insertion loss of the passband of the multiplexer, thereby improving the performance of the multiplexer.

Description

Technical Field

[0001] This application relates to the field of radio frequency filtering technology, and in particular to a multiplexer and a radio frequency front-end module. Background Technology

[0002] A multiplexer typically consists of multiple transmitting resonators (TX resonators) and multiple receiving resonators (RX resonators). Multiplexers can be used in radio frequency front-end modules to filter received radio frequency signals and signals to be transmitted.

[0003] Currently, the antenna port of a multiplexer is usually directly connected in parallel with a grounded matching inductor. This method will increase the insertion loss of the multiplexer's passband, thereby affecting the performance of the multiplexer. Utility Model Content

[0004] This application provides a multiplexer and an RF front-end module that can effectively reduce the insertion loss in the multiplexer's passband, thereby improving the multiplexer's performance.

[0005] In a first aspect, this application provides a multiplexer, which includes an antenna port, a receiving resonator, a first transmitting resonator, a first matching circuit, and a second matching circuit. Multiple receiving resonators are disposed between the first common node and the receiving port; A plurality of the first transmitting resonators are disposed between the antenna port and the first transmitting port; The first matching circuit is connected in series between the first common node and the antenna port, and the first matching circuit is connected in series with the receiving resonator; One end of the second matching circuit is connected to the antenna port, and the other end of the second matching circuit is grounded. The second matching circuit is connected in parallel with the first transmitting resonator, and the first matching circuit is different from the second matching circuit.

[0006] Secondly, this application provides a multiplexer, which includes an antenna port, a receiving resonator, a first transmitting resonator, a first inductor, and a capacitor; The receiving resonator includes multiple series-arm resonators and multiple parallel-arm resonators. The multiple series-arm resonators are connected in series between the first common node and the receiving port, and the multiple parallel-arm resonators are connected in parallel between the first common node and the receiving port. A plurality of the first transmitting resonators are disposed between the antenna port and the first transmitting port; The first inductor is connected in series between the first common node and the antenna port; One end of the capacitor is connected to the antenna port, and the other end of the capacitor is grounded; Wherein, in the receiving resonator, the resonant frequency of the series arm resonator closer to the first common node is greater than the resonant frequency of the series arm resonator farther from the first common node; and / or, In the receiving resonator, the resonant frequency of the parallel arm resonator closer to the first common node is greater than the resonant frequency of the parallel arm resonator farther from the first common node.

[0007] Thirdly, this application provides a radio frequency front-end module, which includes the multiplexer as described above.

[0008] This application provides a multiplexer and an RF front-end module. The multiplexer includes an antenna port, a receiving resonator, a first transmitting resonator, a first matching circuit, and a second matching circuit. Multiple receiving resonators are disposed between a first common node and the receiving port. Multiple first transmitting resonators are disposed between the antenna port and the first transmitting port. The first matching circuit is connected in series between the first common node and the antenna port, and is also connected in series with the receiving resonators. One end of the second matching circuit is connected to the antenna port, and the other end is grounded. The second matching circuit is connected in parallel with the first transmitting resonator, and the first matching circuit and the second matching circuit are different. Therefore, by setting the first matching circuit and the receiving resonator in series and the second matching circuit and the first transmitting resonator in parallel, different first and second matching circuits can be used to generate a resonance effect, thereby effectively reducing the insertion loss in the multiplexer's passband and improving the multiplexer's performance. Furthermore, the multiplexer has a simple structure and low cost. Attached Figure Description

[0009] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic block diagram of a multiplexer provided in an embodiment of this application; Figure 2 This is a schematic diagram of the topology of a multiplexer provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of an interdigital transducer provided in an embodiment of this application; Figure 4 This is a schematic diagram of another multiplexer topology provided in an embodiment of this application; Figure 5 This is a schematic diagram of another multiplexer topology provided in an embodiment of this application; Figure 6 This is a schematic block diagram of another multiplexer provided in the embodiments of this application; Figure 7 This is a schematic diagram of another multiplexer topology provided in an embodiment of this application; Figure 8 A comparison diagram of the transmitter insertion loss response curves of the multiplexer provided in this application and those of multiplexers provided in related technologies; Figure 9 A comparison diagram of the insertion loss response curves of the receiver end of the multiplexer provided in this application and the multiplexers provided in related technologies. Detailed Implementation

[0011] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0012] The flowchart shown in the attached diagram is for illustrative purposes only and does not necessarily include all content and operations / steps, nor does it necessarily have to be performed in the order described. For example, some operations / steps can be broken down, combined, or partially merged, so the actual execution order may change depending on the actual situation.

[0013] It should be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0014] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0015] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0016] Please see Figure 1 , Figure 1 This is a schematic block diagram of a multiplexer provided in an embodiment of this application; Figure 2 This is a schematic diagram of the topology of a multiplexer provided in an embodiment of this application.

[0017] like Figure 1 and Figure 2As shown, the multiplexer 100 includes an antenna port ANT, a receiving resonator 10, a first transmitting resonator 20, a first matching circuit 30, and a second matching circuit 40; multiple receiving resonators 10 are disposed between a first common node n1 and a receiving port n2. For example, multiple receiving resonators 10 can be connected in series between the first common node n1 and the receiving port n2; for another example, multiple receiving resonators 10 can also be connected in parallel between the first common node n1 and the receiving port n2; for yet another example, multiple receiving resonators 10 include series arm resonators and parallel arm resonators, with the series arm resonators connected in series between the first common node n1 and the receiving port n2, and the parallel arm resonators connected in parallel between the first common node n1 and the receiving port n2.

[0018] Multiple first transmitting resonators 20 are disposed between the antenna port ANT and the first transmitting port n3. For example, the multiple first transmitting resonators 20 can be connected in series between the antenna port ANT and the first transmitting port n3; or, for example, the multiple first transmitting resonators 20 can be connected in parallel between the antenna port ANT and the first transmitting port n3; or, for example, the multiple first transmitting resonators 20 include series arm resonators and parallel arm resonators, with the series arm resonators connected in series between the antenna port ANT and the first transmitting port n3, and the parallel arm resonators connected in parallel between the antenna port ANT and the first transmitting port n3.

[0019] The first matching circuit 30 is connected in series between the first common node n1 and the antenna port ANT, and the first matching circuit 30 is connected in series with the receiving resonator 10; one end of the second matching circuit 40 is connected to the antenna port ANT, the other end of the second matching circuit 40 is grounded, the second matching circuit 40 is connected in parallel with the first transmitting resonator 20, and the first matching circuit 30 and the second matching circuit 40 are different.

[0020] For example, the first matching circuit 30 is disposed between the first common node n1 and the antenna port ANT, and is connected in series with the receiving resonator 10. The second matching circuit 40 is connected to the antenna port ANT and is connected in parallel with the first transmitting resonator 20. The first matching circuit 30 and the second matching circuit 40 can be any impedance matching circuit that can adjust the circuit. The first matching circuit 30 and the second matching circuit 40 are different, so that the first matching circuit 30 and the second matching circuit 40 form a loop, thereby generating a resonance effect to form a corresponding matching network, thereby eliminating impedance mismatch between the transmission line and the device, reducing signal reflection and loss, and reducing the influence between the receiving resonator 10 and the first transmitting resonator 20.

[0021] For example, the first matching circuit 30 may be composed of inductive elements, which may include elements such as inductors that can impede changes in current (inductive reactance), such as wire-wound inductors formed on the substrate where the multiplexer 100 is located.

[0022] For example, the second matching circuit 40 may be composed of capacitive elements, which may include components such as capacitors that can impede voltage changes (capacitive reactance). The capacitive elements may be integrated within the multiplexer 100, or may be formed as parallel plate capacitors or interdigitated capacitors.

[0023] Taking the first matching circuit 30 including an inductive element and the second matching circuit 40 including a capacitive element as an example, the inductive element can form a loop with the capacitive element, thereby generating a resonance effect to form a corresponding matching network, thereby eliminating impedance mismatch between the transmission line and the device, reducing signal reflection and loss, thereby reducing the influence between the receiving resonator 10 and the first transmitting resonator 20, thereby effectively reducing the insertion loss of the passband of the multiplexer 100, and thus improving the performance of the multiplexer 100.

[0024] Taking the multiplexer 100 as an example, the duplexer includes a receiving end RF signal link composed of a first matching circuit 30 and a receiving resonator 10 and a transmitting end RF signal link composed of a second matching circuit 40 and a first transmitting resonator 20. The receiving end RF signal link and the transmitting end RF signal link are respectively connected to the antenna port ANT.

[0025] In this embodiment, by setting the first matching circuit 30 and the receiving resonator 10 in series and the second matching circuit 40 and the first transmitting resonator 20 in parallel, different first matching circuits 30 and second matching circuits 40 can be used to generate a resonance effect, thereby effectively reducing the insertion loss of the passband of the multiplexer 100 and improving the performance of the multiplexer 100. Moreover, the multiplexer 100 has a simple structure and low cost.

[0026] In some embodiments, the first matching circuit 30 includes a first inductor L1, and the second matching circuit 40 includes a capacitor C1 or an interdigital transducer 23.

[0027] like Figure 2 As shown, for example, the first matching circuit 30 includes a first inductor L1, that is, the first inductor L1 is connected in series between the first common node n1 and the antenna port ANT, and the first inductor L1 is connected in series with a plurality of receiving resonators 10.

[0028] like Figure 2As shown, exemplarily, the second matching circuit 40 includes a capacitor C1, one end of which is connected to the antenna port ANT, and the other end of which is grounded. The capacitor C1 is connected in parallel with multiple first transmitting resonators 20. Since the first inductor L1 and the capacitor C1 form a loop, the first inductor L1 and the capacitor C1 can generate a resonance effect to form a corresponding matching network, reducing the influence between the receiving resonator 10 and the first transmitting resonator 20, thereby effectively reducing the insertion loss of the passband of the multiplexer 100 and improving the performance of the multiplexer 100. Moreover, the first matching circuit 30 only includes the first inductor L1, and the second matching circuit 40 only includes the capacitor C1. The multiplexer 100 has a simple structure and low cost.

[0029] like Figure 2 and Figure 3 As shown, exemplarily, the second matching circuit 40 includes an interdigital transducer 23. The input terminal of the interdigital transducer 23 is connected to the antenna port ANT, and the output terminal of the interdigital transducer 23 is grounded. The interdigital transducer 23 is connected in parallel with multiple first transmitting resonators 20. In this embodiment, the interdigital transducer 23 is inductive. Therefore, the first inductor L1 and the interdigital transducer 23 can generate a resonance effect to form a corresponding matching network, thereby effectively reducing the insertion loss of the passband of the multiplexer 100 and improving the performance of the multiplexer 100. Furthermore, the first matching circuit 30 only includes the first inductor L1, and the second matching circuit 40 only includes the interdigital transducer 23, indicating that the multiplexer 100 provided in this embodiment has a simple structure and low cost. Simultaneously, in this embodiment, by setting the capacitor as the structure of the interdigital transducer 23, the electrode finger fabrication process can be used when fabricating the interdigital transducer, thus eliminating the need for separate inductor or capacitor structures and simplifying the process flow.

[0030] In some embodiments, the inductance value of the first inductor L1 is greater than or equal to 5nH and less than or equal to 20nH; and / or, the capacitance value of the capacitor C1 is greater than or equal to 0.2pF and less than or equal to 1pF.

[0031] For example, the inductance value of the first inductor L1 can be 5nH, 7nH, 9nH, 10nH, 12nH, 15nH, 18nH, 20nH, etc., without specific limitation. Therefore, by controlling the inductance value of the first inductor L1 to be greater than or equal to 5nH and less than or equal to 20nH, the formed matching network can further reduce signal reflection and loss, further reduce the insertion loss of the multiplexer 100 passband, and thus further improve the performance of the multiplexer 100.

[0032] For example, the capacitance value of capacitor C1 can be 0.2pF, 0.3pF, 0.45pF, 0.5pF, 0.7pF, 0.8pF, 0.95pF, 1pF, etc., without specific limitation. Therefore, by controlling the capacitance value of capacitor C1 to be greater than or equal to 0.2pF and less than or equal to 1pF, the formed matching network can further reduce signal reflection and loss, thereby further reducing the insertion loss of the multiplexer 100 passband, and further improving the performance of the multiplexer 100.

[0033] It should be noted that the inductance value of the first inductor L1 can be controlled to be greater than or equal to 5nH and less than or equal to 20nH, or the capacitance value of the capacitor C1 can be controlled to be greater than or equal to 0.2pF and less than or equal to 1pF. Preferably, the inductance value of the first inductor L1 is set to be greater than or equal to 5nH and less than or equal to 20nH, while the capacitance value of the capacitor C1 is set to be greater than or equal to 0.2pF and less than or equal to 1pF.

[0034] like Figure 3 As shown, in some embodiments, the second matching circuit 40 includes an interdigital transducer 23, which includes two busbars 231 disposed opposite to each other and electrodes electrically connected to the busbars 231. The electrodes include a plurality of electrode fingers 232 disposed at intervals. The number of electrode fingers 232 in the interdigital transducer 23 is less than the number of electrode fingers 232 in any one of the first transmitting resonators 20.

[0035] The interdigital transducer 23 includes two busbars 231 arranged opposite to each other, and electrodes electrically connected to the busbars 231. The electrodes include a plurality of electrode fingers 232 arranged at intervals.

[0036] In the first direction, at least an overlapping region A and a gap region B adjacent to the overlapping region A are provided between the two busbars 231. The overlapping region A is located on the side of the gap region B away from the busbar 231, and the electrode finger 232 is at least located within the overlapping region A. See details. Figure 3 In one embodiment, some electrode fingers 232 are correspondingly disposed within the overlapping region A, and some electrode fingers 232 are correspondingly disposed within the gap region B. The electrode fingers 232 within the overlapping region A extend along a first direction, thereby forming... Figure 3 The structure of electrode finger 232 is such that the first direction is the extension direction of electrode finger 232.

[0037] It can be understood that the overlapping region A is the area where the electrode fingers 232 overlap each other. Specifically, multiple electrode fingers 232 are arranged alternately, and the overlapping region A is the area where the projections of multiple electrode fingers 232 overlap in the second direction. The gap region B is the area adjacent to the overlapping region A. For example, multiple electrode fingers 232 can be configured to be distributed at equal intervals; an electrode finger 232 electrically connected to one of the busbars 231 can be spaced apart from an electrode finger 232 electrically connected to another busbar 231; the arrangement of the electrode fingers 232 can be arbitrary and is not specifically limited here.

[0038] For example, the materials of busbar 231 and electrode finger 232 include any one or more of aluminum, molybdenum, copper, gold, platinum, silver, nickel, chromium, and tungsten, or other metal materials, all of which are within the scope of protection of this application and are not specifically limited here. They can be determined according to specific circumstances, but the selected materials need to have good conductivity.

[0039] For example, the electrode finger 232 is usually set as a strip. The cross-section of the electrode finger 232 may also be trapezoidal or other shapes under the influence of process conditions. Under normal circumstances, the extension direction of the long side of the electrode finger 232 will be perpendicular to the extension direction of the busbar 231. Under specific circumstances, the electrode finger 232 may also be set at an angle relative to the busbar 231, and multiple electrode fingers 232 are parallel to each other, while a certain gap is left between adjacent electrode fingers 232.

[0040] In this embodiment, the number of electrode fingers 232 in the interdigital transducer 23 is less than the number of electrode fingers 232 in any one of the first transmitting resonators 20. That is, the number of electrode fingers 232 in the interdigital transducer 23 is 10, and the number of electrode fingers 232 in any one of the first transmitting resonators 20 is at least greater than 10, such as 11 or 16, etc., without specific limitation. By setting the number of electrode fingers 232 in the interdigital transducer 23 to be less than the number of electrode fingers 232 in any one of the first transmitting resonators 20, the insertion loss in the passband of the multiplexer 100 can be further reduced, thereby further improving the performance of the multiplexer 100.

[0041] like Figure 2 As shown, in some embodiments, the receiving resonator 10 includes at least a first series arm resonator 11 and a second series arm resonator 12 connected in series between the first common node n1 and the receiving port n2; wherein the first series arm resonator 11 is disposed close to the first common node n1, the second series arm resonator 12 is disposed close to the receiving port n2, and the resonant frequency of the first series arm resonator 11 is greater than the resonant frequency of the second series arm resonator 12.

[0042] For example, the receiving resonator 10 may include a plurality of series-arm resonators connected in series between the first common node n1 and the receiving port n2. Taking the plurality of series-arm resonators including a first series-arm resonator 11 and a second series-arm resonator 12 as an example, both the first series-arm resonator 11 and the second series-arm resonator 12 are connected in series between the first common node n1 and the receiving port n2.

[0043] Specifically, the first series arm resonator 11 can be positioned close to the first common node n1, and the second series arm resonator 12 can be positioned close to the receiving port n2. Furthermore, the resonant frequency of the first series arm resonator 11 is set to be higher than the resonant frequency of the second series arm resonator 12. Therefore, by differentiating the positions and resonant frequencies of the first and second series arm resonators 11 and 12, the insertion loss in the passband of the multiplexer 100 can be further reduced, thereby further improving the performance of the multiplexer 100.

[0044] Taking multiple series-arm resonators, including three or more series-arm resonators, as an example, the resonant frequency of the series-arm resonator closer to the first common node n1 is greater than the resonant frequency of the series-arm resonator farther from the first common node n1. That is, the closer the series-arm resonator is to the first common node n1 (hereinafter referred to as the first distance), the higher the resonant frequency of the series-arm resonator; the farther the series-arm resonator is from the first common node n1, the lower the resonant frequency of the series-arm resonator. Therefore, in the same RF link, the resonant frequency of each series-arm resonator is negatively correlated with its corresponding first distance.

[0045] like Figure 2 As shown, in some embodiments, the receiving resonator 10 further includes a longitudinally coupled dual-mode surface acoustic wave resonator 13 (DMS). Multiple longitudinally coupled dual-mode surface acoustic wave resonators 13 can be arranged in parallel. A first series arm resonator 11 is connected in series between the first common node n1 and the input terminal of the longitudinally coupled dual-mode surface acoustic wave resonator 13, and a second series arm resonator 12 is connected in series between the receiving port n2 and the output terminal of the longitudinally coupled dual-mode surface acoustic wave resonator 13.

[0046] For example, by connecting a longitudinally coupled dual-mode surface acoustic wave resonator 13 in series between the first series arm resonator 11 and the second series arm resonator 12, the combination of the longitudinal coupling structure and the series arm resonator can achieve high selectivity for specific frequency signals, while also improving the out-of-band rejection capability of the multiplexer 100.

[0047] In some embodiments, the receiving resonator 10 further includes a first parallel arm resonator 14 and a second parallel arm resonator 15; wherein one end of the first parallel arm resonator 14 is connected to the first common node n1, and the other end of the first parallel arm resonator 14 is grounded; one end of the second parallel arm resonator 15 is connected to the receiving port n2, and the other end of the second parallel arm resonator 15 is grounded; and the resonant frequency of the first parallel arm resonator 14 is greater than the resonant frequency of the second parallel arm resonator 15.

[0048] For example, the receiving resonator 10 may further include a plurality of parallel-arm resonators connected in parallel between the first common node n1 and the receiving port n2. Taking the plurality of parallel-arm resonators including a first parallel-arm resonator 14 and a second parallel-arm resonator 15 as an example, one end of the first parallel-arm resonator 14 is connected to the first common node n1, and the other end of the first parallel-arm resonator 14 is grounded; one end of the second parallel-arm resonator 15 is connected to the receiving port n2, and the other end of the second parallel-arm resonator 15 is grounded.

[0049] Specifically, the first parallel arm resonator 14 is connected to the first common node n1, and the second parallel arm resonator 15 is connected to the receiving port n2. The resonant frequency of the first parallel arm resonator 14 is set to be higher than the resonant frequency of the second parallel arm resonator 15. Therefore, by differentiating the positions and resonant frequencies of the first and second parallel arm resonators 14 and 15, the insertion loss in the passband of the multiplexer 100 can be further reduced, thereby further improving the performance of the multiplexer 100.

[0050] Taking multiple series-arm resonators, including three or more parallel-arm resonators, as an example, the resonant frequency of the parallel-arm resonator closer to the first common node n1 is greater than the resonant frequency of the parallel-arm resonator farther from the first common node n1. That is, the closer the parallel-arm resonator is to the first common node n1 (hereinafter referred to as the second distance), the higher its resonant frequency; the farther the parallel-arm resonator is from the first common node n1, the lower its resonant frequency. Therefore, in the same RF link, the resonant frequency of each parallel-arm resonator is negatively correlated with its corresponding second distance.

[0051] In some embodiments, the resonant frequency of the second series arm resonator 12 is greater than the resonant frequency of the first parallel arm resonator 14.

[0052] For example, the resonant frequency of the second series arm resonator 12 is greater than the resonant frequency of the first parallel arm resonator 14. Since the resonant frequency of the second series arm resonator 12 is generally the lowest among the series arm resonators, while the resonant frequency of the first parallel arm resonator 14 is generally the highest among the parallel arm resonators, it can be assumed that among the multiple receiving resonators 10, the resonant frequency of any one series arm resonator is greater than the resonant frequency of any one parallel arm resonator.

[0053] Specifically, by setting the resonant frequency of any series arm resonator to be higher than that of any parallel arm resonator, the insertion loss in the passband of the multiplexer 100 can be further reduced, thereby further improving the performance of the multiplexer 100, through differentiated settings of the resonant frequencies of the series and parallel arm resonators.

[0054] In some embodiments, the first transmitting resonator 20 includes a third series arm resonator 21 and a third parallel arm resonator 22; wherein, the third series arm resonator 21 is connected in series between the antenna port ANT and the first transmitting port n3, one end of the third parallel arm resonator 22 is connected to the third series arm resonator 21, and the other end of the third parallel arm resonator 22 is grounded.

[0055] For example, the first transmitting resonator 20 includes at least a third series arm resonator 21 and a third parallel arm resonator 22. One end of the third series arm resonator 21 is connected to the antenna port ANT, and the other end of the third series arm resonator 21 is connected to the first transmitting port n3. The third parallel arm resonator 22 is arranged in parallel between the third series arm resonator 21 and the first transmitting port n3.

[0056] In some embodiments, the resonant frequency of the third series arm resonator 21 is greater than the resonant frequency of the third parallel arm resonator 22.

[0057] For example, the resonant frequency of the third series arm resonator 21 is greater than the resonant frequency of the third parallel arm resonator 22. Taking the first transmitting resonator 20 as an example, which includes multiple third series arm resonators 21 and multiple third parallel arm resonators 22, the resonant frequency of any one of the third series arm resonators 21 is greater than the resonant frequency of any one of the third parallel arm resonators 22.

[0058] Specifically, the resonant frequency of the third series arm resonator 21 is set to be greater than that of the third parallel arm resonator 22. This allows for differentiated settings of the resonant frequencies of the third series arm resonator 21 and the third parallel arm resonator 22, thereby further reducing the insertion loss in the passband of the multiplexer 100 and further improving its performance.

[0059] like Figure 4 As shown, in some embodiments, the multiplexer 100 further includes a second inductor L2, which is connected in series between the third series arm resonator 21 and the first transmitting port n3, and the second inductor L2 is positioned close to the first transmitting port n3.

[0060] The second inductor L2 is a component that can impede changes in current (inductive reactance), such as a wire-wound inductor formed on the substrate of the multiplexer 100.

[0061] For example, by connecting a second inductor L2 in series between the third series arm resonator 21 and the first transmitting port n3, the second inductor L2 can play the role of impedance matching, thereby eliminating impedance mismatch between the transmission line and the device, reducing signal reflection and loss, thereby effectively reducing the insertion loss of the passband of the multiplexer 100, and thus improving the performance of the multiplexer 100.

[0062] like Figure 5 As shown, in some embodiments, the multiplexer 100 further includes a third inductor L3, which is connected in series between the receiving resonator 10 and the receiving port n2, and the third inductor L3 is positioned close to the receiving port n2.

[0063] The third inductor L3 is a component that can impede changes in current (inductive reactance), such as a wire-wound inductor formed on the substrate where the multiplexer 100 is located.

[0064] For example, by connecting a third inductor L3 in series between the receiving resonator 10 and the receiving port n2, the third inductor L3 can play the role of impedance matching, thereby eliminating the impedance mismatch between the transmission line and the device, reducing signal reflection and loss, thereby effectively reducing the insertion loss of the passband of the multiplexer 100, and thus improving the performance of the multiplexer 100.

[0065] like Figure 6 As shown, in some embodiments, the multiplexer 100 further includes a second transmit resonator 50, and a plurality of second transmit resonators 50 are disposed between the antenna port ANT and the second transmit port n4.

[0066] For example, a plurality of second transmitting resonators 50 are disposed between the antenna port ANT and the second transmitting port n4. For example, the plurality of second transmitting resonators 50 may be connected in series between the antenna port ANT and the second transmitting port n4; or, for example, the plurality of second transmitting resonators 50 may be connected in parallel between the antenna port ANT and the second transmitting port n4; or, for example, the plurality of second transmitting resonators 50 include series arm resonators and parallel arm resonators, wherein the series arm resonators are connected in series between the antenna port ANT and the second transmitting port n4, and the parallel arm resonators are connected in parallel between the antenna port ANT and the second transmitting port n4.

[0067] In this embodiment, the multiplexer 100 includes a receiving resonator 10, a first transmitting resonator 20, and a second transmitting resonator 50. That is, the multiplexer 100 is configured as a tripartite, comprising a receiving RF signal link composed of the receiving resonator 10, a first transmitting RF signal link composed of the first transmitting resonator 20, and a second transmitting RF signal link composed of the second transmitting resonator 50. The receiving RF signal link, the first transmitting RF signal link, and the second transmitting RF signal link are respectively connected to the antenna port ANT. Similarly, a quadrupler can also be configured by adding an additional transmitting RF signal link.

[0068] It should be noted that the specific configuration of the second transmitting resonator 50 can be referred to the relevant embodiments of the first transmitting resonator 20, and will not be repeated here.

[0069] The following will provide a detailed description of another multiplexer 100 provided in the embodiments of this application.

[0070] like Figure 2 As shown, the multiplexer 100 includes an antenna port ANT, a receiving resonator 10, a first transmitting resonator 20, a first inductor L1, and a capacitor C1; multiple receiving resonators 10 are disposed between a first common node n1 and a receiving port n2. For example, multiple receiving resonators 10 can be connected in series between the first common node n1 and the receiving port n2; for another example, multiple receiving resonators 10 can also be connected in parallel between the first common node n1 and the receiving port n2; for yet another example, multiple receiving resonators 10 include series arm resonators and parallel arm resonators, with the series arm resonators connected in series between the first common node n1 and the receiving port n2, and the parallel arm resonators connected in parallel between the first common node n1 and the receiving port n2.

[0071] Multiple first transmitting resonators 20 are disposed between the antenna port ANT and the first transmitting port n3. For example, the multiple first transmitting resonators 20 can be connected in series between the antenna port ANT and the first transmitting port n3; or, for example, the multiple first transmitting resonators 20 can be connected in parallel between the antenna port ANT and the first transmitting port n3; or, for example, the multiple first transmitting resonators 20 include series arm resonators and parallel arm resonators, with the series arm resonators connected in series between the antenna port ANT and the first transmitting port n3, and the parallel arm resonators connected in parallel between the antenna port ANT and the first transmitting port n3.

[0072] For example, the receiving resonator 10 may include a plurality of series-arm resonators connected in series between the first common node n1 and the receiving port n2. Taking the plurality of series-arm resonators including a first series-arm resonator 11 and a second series-arm resonator 12 as an example, both the first series-arm resonator 11 and the second series-arm resonator 12 are connected in series between the first common node n1 and the receiving port n2.

[0073] Specifically, the first series arm resonator 11 can be positioned close to the first common node n1, and the second series arm resonator 12 can be positioned close to the receiving port n2. Furthermore, the resonant frequency of the first series arm resonator 11 is set to be higher than the resonant frequency of the second series arm resonator 12. Therefore, by differentiating the positions and resonant frequencies of the first and second series arm resonators 11 and 12, the insertion loss in the passband of the multiplexer 100 can be further reduced, thereby further improving the performance of the multiplexer 100.

[0074] Taking multiple series-arm resonators, including three or more series-arm resonators, as an example, the resonant frequency of the series-arm resonator closer to the first common node n1 is greater than the resonant frequency of the series-arm resonator farther from the first common node n1. That is, the closer the series-arm resonator is to the first common node n1 (hereinafter referred to as the first distance), the higher the resonant frequency of the series-arm resonator; the farther the series-arm resonator is from the first common node n1, the lower the resonant frequency of the series-arm resonator. Therefore, in the same RF link, the resonant frequency of each series-arm resonator is negatively correlated with its corresponding first distance.

[0075] For example, the receiving resonator 10 may further include a plurality of parallel-arm resonators connected in parallel between the first common node n1 and the receiving port n2. Taking the plurality of parallel-arm resonators including a first parallel-arm resonator 14 and a second parallel-arm resonator 15 as an example, one end of the first parallel-arm resonator 14 is connected to the first common node n1, and the other end of the first parallel-arm resonator 14 is grounded; one end of the second parallel-arm resonator 15 is connected to the receiving port n2, and the other end of the second parallel-arm resonator 15 is grounded.

[0076] Specifically, the first parallel arm resonator 14 is connected to the first common node n1, and the second parallel arm resonator 15 is connected to the receiving port n2. The resonant frequency of the first parallel arm resonator 14 is set to be higher than the resonant frequency of the second parallel arm resonator 15. Therefore, by differentiating the positions and resonant frequencies of the first and second parallel arm resonators 14 and 15, the insertion loss in the passband of the multiplexer 100 can be further reduced, thereby further improving the performance of the multiplexer 100.

[0077] Taking multiple series-arm resonators, including three or more parallel-arm resonators, as an example, the resonant frequency of the parallel-arm resonator closer to the first common node n1 is greater than the resonant frequency of the parallel-arm resonator farther from the first common node n1. That is, the closer the parallel-arm resonator is to the first common node n1 (hereinafter referred to as the second distance), the higher its resonant frequency; conversely, the farther the parallel-arm resonator is from the first common node n1, the lower its resonant frequency. Therefore, in the same RF link, the resonant frequency of each parallel-arm resonator is negatively correlated with its corresponding second distance.

[0078] The first inductor L1 is connected in series between the first common node n1 and the antenna port ANT, and the first inductor L1 is connected in series with the receiving resonator 10; one end of the capacitor C1 is connected to the antenna port ANT, the other end of the capacitor C1 is grounded, and the capacitor C1 is connected in parallel with the first transmitting resonator 20.

[0079] For example, the first inductor L1 is disposed between the first common node n1 and the antenna port ANT, and is connected in series with the receiving resonator 10. The capacitor C1 is connected to the antenna port ANT and is connected in parallel with the first transmitting resonator 20. The first inductor L1 and the capacitor C1 can form a loop, thereby generating a resonance effect to form a corresponding matching network, thereby eliminating the impedance mismatch between the transmission line and the device, reducing signal reflection and loss, and reducing the influence between the receiving resonator 10 and the first transmitting resonator 20.

[0080] Taking the multiplexer 100 as an example, the duplexer includes a receiving end RF signal link composed of a first inductor L1 and a receiving resonator 10 and a transmitting end RF signal link composed of a capacitor C1 and a first transmitting resonator 20. The receiving end RF signal link and the transmitting end RF signal link are respectively connected to the antenna port ANT.

[0081] It should be noted that the relevant embodiments of the antenna port ANT, the receiving resonator 10, the first transmitting resonator 20, the first inductor L1 and the capacitor C1 can be referred to the above embodiments, and will not be repeated here.

[0082] In this embodiment, by setting the first inductor L1 in series with the receiving resonator 10 and the capacitor C1 in parallel with the first transmitting resonator 20, the first inductor L1 and the capacitor C1 can generate a resonance effect, thereby effectively reducing the insertion loss of the passband of the multiplexer 100 and improving the performance of the multiplexer 100. Moreover, the multiplexer 100 has a simple structure and low cost.

[0083] In some embodiments, the number of first transmitting resonators 20 is greater than the number of receiving resonators 10.

[0084] For example, by controlling the number of the first transmitting resonator 20 and the receiving resonator 10 such that the number of the first transmitting resonator 20 is greater than the number of the receiving resonator 10, the insertion loss of the passband of the multiplexer 100 can be further reduced by differentiating the number of the first transmitting resonator 20 and the receiving resonator 10, thereby further improving the performance of the multiplexer 100.

[0085] like Figure 7 As shown, in some embodiments, the first transmitting resonator 20 includes at least a third series arm resonator 21, a third parallel arm resonator 22, and a fourth parallel arm resonator 24; wherein, the third series arm resonator 21 is connected in series between the antenna port ANT and the first transmitting port n3, one end of the third parallel arm resonator 22 is connected to the third series arm resonator 21, the other end of the third parallel arm resonator 22 is grounded through the fourth inductor L4, the fourth parallel arm resonator 24 is connected in parallel with the third series arm resonator 21, and the fourth parallel arm resonator 24 is also grounded through the fifth inductor L5.

[0086] For example, one end of the fourth inductor L4 is connected to the third parallel arm resonator 22, and the other end of the fourth inductor L4 is grounded. One end of the fifth inductor L5 is connected to the fourth parallel arm resonator 24, and the other end of the fifth inductor L5 is grounded. Both the fourth inductor L4 and the fifth inductor L5 can perform impedance matching, thereby eliminating impedance mismatch between the transmission line and the device, reducing signal reflection and loss, effectively reducing the insertion loss of the passband of the multiplexer 100, and thus improving the performance of the multiplexer 100.

[0087] In some embodiments, the fourth inductor L4 is connected in parallel with the capacitor C1; and / or, the inductance values ​​of the fourth inductor L4 and the fifth inductor L5 are different.

[0088] For example, the third series arm resonator 21 and the fourth inductor L4 are also connected in parallel with the capacitor C1. In this embodiment, the fourth inductor L4 can also resonate with the capacitor C1 to form a corresponding matching network, thereby further reducing the insertion loss of the passband of the multiplexer 100 and further improving the performance of the multiplexer 100.

[0089] For example, the inductance value of the fourth inductor L4 is different from the inductance value of the fifth inductor L5. For instance, the inductance value of the fourth inductor L4 can be greater than the inductance value of the fifth inductor L5, or the inductance value of the fourth inductor L4 can be less than the inductance value of the fifth inductor L5. By differentiating the inductance values ​​of the fourth inductor L4 and the fifth inductor L5, the insertion loss of the passband of the multiplexer 100 can be further reduced, thereby further improving the performance of the multiplexer 100.

[0090] The following simulation experiment will compare the insertion loss response curves of the multiplexer 100 provided in this application with those of multiplexers provided in related technologies.

[0091] It should be noted that the multiplexer 100 provided in this application is any one of the multiplexers 100 provided in the above embodiments, that is, as shown in the example. Figure 1-7 The multiplexer 100 involved in the present invention (embodiment) has a topology of a multiplexer (comparative example) provided in the related art, wherein the antenna port is directly connected in parallel to the ground matching inductor.

[0092] like Figure 8 As shown, Figure 8 A comparison diagram of the transmitter insertion loss response curves of the multiplexer provided in this application and those of multiplexers provided in related technologies is shown. Simulation experiments demonstrate that, compared to the multiplexer 100 provided in the comparative example, the insertion loss response curve of the multiplexer 100 provided in this application is smoother. This indicates that the multiplexer 100 provided in this application has smaller in-band ripple and a more stable passband. Furthermore, the insertion loss is significantly improved, meaning that the multiplexer 100 provided in this application effectively reduces the insertion loss in the passband.

[0093] like Figure 9 As shown, Figure 9 A comparison diagram of the insertion loss response curves of the multiplexer provided in this application and those provided in related technologies is shown. Simulation experiments demonstrate that, compared to the multiplexer provided in the comparative example, the insertion loss response curve of the multiplexer 100 provided in this application is smoother. This indicates that the multiplexer 100 provided in this application has smaller in-band ripple and a more stable passband. Furthermore, the insertion loss is significantly improved, meaning that the multiplexer 100 provided in this application effectively reduces the insertion loss in the passband.

[0094] This application also provides an RF front-end module, which includes the multiplexer 100 described in any of the above embodiments. This RF front-end module can effectively reduce passband insertion loss, and its structure is simple and cost-effective, thereby improving its performance, reliability, security, and practicality.

[0095] The radio frequency front-end module may also include at least one other device such as an antenna, a power amplifier, a low-noise amplifier, and a switch, without being specifically limited here.

[0096] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A multiplexer, characterized in that, The multiplexer includes: Antenna port; A receiving resonator, wherein a plurality of the receiving resonators are disposed between a first common node and a receiving port; A first transmitting resonator, and a plurality of first transmitting resonators are disposed between the antenna port and the first transmitting port; A first matching circuit is connected in series between the first common node and the antenna port, and the first matching circuit is connected in series with the receiving resonator. The second matching circuit has one end connected to the antenna port and the other end grounded. The second matching circuit is connected in parallel with the first transmitting resonator, and the first matching circuit is different from the second matching circuit.

2. The multiplexer according to claim 1, characterized in that, The first matching circuit includes a first inductor, and the second matching circuit includes a capacitor or an interdigital transducer.

3. The multiplexer according to claim 2, characterized in that, The second matching circuit includes an interdigital transducer, which includes two busbars arranged opposite each other and electrodes electrically connected to the busbars. The electrodes include a plurality of electrode fingers arranged at intervals. The electrode index in the interdigital transducer is less than the electrode index in any one of the first transmitting resonators.

4. The multiplexer according to claim 2, characterized in that, The inductance of the first inductor is greater than or equal to 5nH and less than or equal to 20nH; and / or the capacitance of the capacitor is greater than or equal to 0.2pF and less than or equal to 1pF.

5. The multiplexer according to claim 1, characterized in that, The receiving resonator includes at least a first series arm resonator and a second series arm resonator connected in series between the first common node and the receiving port. The first series arm resonator is positioned close to the first common node, and the second series arm resonator is positioned close to the receiving port. The resonant frequency of the first series arm resonator is greater than the resonant frequency of the second series arm resonator.

6. The multiplexer according to claim 5, characterized in that, The receiving resonator further includes a longitudinally coupled dual-mode surface acoustic wave resonator, wherein the first series arm resonator is connected in series between the first common node and the input terminal of the longitudinally coupled dual-mode surface acoustic wave resonator, and the second series arm resonator is connected in series between the receiving port and the output terminal of the longitudinally coupled dual-mode surface acoustic wave resonator.

7. The multiplexer according to claim 5, characterized in that, The receiving resonator also includes a first parallel arm resonator and a second parallel arm resonator; Wherein, one end of the first parallel arm resonator is connected to the first common node, and the other end of the first parallel arm resonator is grounded; one end of the second parallel arm resonator is connected to the receiving port, and the other end of the second parallel arm resonator is grounded; the resonant frequency of the first parallel arm resonator is greater than the resonant frequency of the second parallel arm resonator.

8. The multiplexer according to claim 7, characterized in that, The resonant frequency of the second series arm resonator is greater than the resonant frequency of the first parallel arm resonator.

9. The multiplexer according to claim 1, characterized in that, The first transmitting resonator includes a third series arm resonator and a third parallel arm resonator; The third series arm resonator is connected in series between the antenna port and the first transmit port, one end of the third parallel arm resonator is connected to the third series arm resonator, and the other end of the third parallel arm resonator is grounded.

10. The multiplexer according to claim 9, characterized in that, The resonant frequency of the third series arm resonator is greater than the resonant frequency of the third parallel arm resonator.

11. The multiplexer according to claim 9, characterized in that, The multiplexer also includes a second inductor, which is connected in series between the third series arm resonator and the first transmitting port, and the second inductor is positioned close to the first transmitting port.

12. The multiplexer according to claim 1, characterized in that, The multiplexer also includes a third inductor, which is connected in series between the receiving resonator and the receiving port, and the third inductor is positioned close to the receiving port.

13. The multiplexer according to claim 1, characterized in that, The multiplexer also includes: Second transmitting resonator, a plurality of second transmitting resonators are disposed between the antenna port and the second transmitting port.

14. A multiplexer, characterized in that, The multiplexer includes: Antenna port; A receiving resonator includes multiple series-arm resonators and multiple parallel-arm resonators. The multiple series-arm resonators are connected in series between a first common node and a receiving port, and the multiple parallel-arm resonators are connected in parallel between the first common node and the receiving port. A first transmitting resonator, and a plurality of first transmitting resonators are disposed between the antenna port and the first transmitting port; A first inductor is connected in series between the first common node and the antenna port; A capacitor, one end of which is connected to the antenna port, and the other end of which is grounded; Wherein, in the receiving resonator, the resonant frequency of the series arm resonator closer to the first common node is greater than the resonant frequency of the series arm resonator farther from the first common node; and / or, In the receiving resonator, the resonant frequency of the parallel arm resonator closer to the first common node is greater than the resonant frequency of the parallel arm resonator farther from the first common node.

15. The multiplexer according to claim 14, characterized in that, The number of the first transmitting resonators is greater than the number of the receiving resonators.

16. The multiplexer according to claim 14, characterized in that, The first transmitting resonator includes at least a third series arm resonator, a third parallel arm resonator, and a fourth parallel arm resonator; The third series arm resonator is connected in series between the antenna port and the first transmit port. One end of the third parallel arm resonator is connected to the third series arm resonator, and the other end of the third parallel arm resonator is grounded through a fourth inductor. The fourth parallel arm resonator is connected in parallel with the third series arm resonator, and the fourth parallel arm resonator is also grounded through a fifth inductor.

17. The multiplexer according to claim 16, characterized in that, The fourth inductor is connected in parallel with the capacitor; and / or the inductance values ​​of the fourth inductor and the fifth inductor are different.

18. A radio frequency front-end module, characterized in that, The radio frequency front-end module includes a multiplexer as described in any one of claims 1 to 17.

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