A multiplexer and inter-band carrier aggregation system

Abstract

The present invention provides a multiplexer and an inter-band carrier aggregation system, which relate to the field of acoustic radio frequency devices. The multiplexer is applied to the inter-band carrier aggregation system, and the multiplexer includes a transmitting channel and a receiving channel, the transmitting channel includes at least two transmitting filter circuits, and the receiving channel includes at least two receiving filter circuits. The first end of the transmitting filter circuit is connected to the first end of the receiving filter circuit, and is connected to the antenna module as an antenna port. When the integrated frequency band of the multiplexer includes a frequency division duplex frequency band, and at least two receiving / transmitting ports include a transmitting port and a receiving port; the second end of the transmitting filter circuit is connected to the power amplifier module as a transmitting port. The second end of the receiving filter circuit is connected to the low noise amplifier module as a receiving port. Based on this, the present invention can improve the inter-band carrier aggregation performance of the transmitting frequency band and / or the receiving frequency band on the basis of reducing the complexity of the circuit.

Description

Technical Field

[0001] The present invention relates to the field of acoustic radio frequency devices, and in particular to a multiplexer and an inter-band carrier aggregation system. Background Art

[0002] With the development of communication technology, in order to meet different communication standards and support more communication frequency bands, carrier aggregation (CA) technology is often used to improve data transmission rate and frequency resource utilization.

[0003] In the prior art, carrier aggregation technology only integrates the antenna port (Antenna, ANT) together, keeping the receiving (RX) and / or transmitting (TX) ports independent. However, taking the independence of the transmitting port as an example, it is necessary to set up multiple RF power amplifiers (Power amplifier, PA) and switch components in the carrier aggregation system to achieve inter-band carrier aggregation by turning on multiple power amplifiers and switches at the same time. At the same time, in order to meet the impedance matching of different inter-band carrier aggregations, it is also necessary to perform impedance matching design on each transmitting port under the carrier aggregation system, further increasing the complexity of the circuit.

[0004] Similarly, if the receiving port is kept independent, multiple low noise power amplifiers (LNA) and switch components need to be set in the carrier aggregation system to achieve inter-band carrier aggregation by turning on multiple low noise power amplifiers and switches at the same time. At the same time, in order to meet the impedance matching of different inter-band carrier aggregations, it is also necessary to perform impedance matching design on each receiving port in the carrier aggregation system, further increasing the complexity of the circuit.

[0005] Based on this, there is an urgent need for a communication solution that can improve the inter-band carrier performance of the transmitting frequency band and / or the receiving frequency band while reducing the circuit complexity. Summary of the invention

[0006] In view of this, an object of the present invention is to provide a multiplexer and an inter-band carrier aggregation system, which can improve the inter-band carrier performance of the transmission frequency band and / or the reception frequency band on the basis of reducing the circuit complexity.

[0007] In order to achieve the above purpose, the technical solution adopted by the embodiment of the present invention is as follows:

[0008] In a first aspect, the present invention provides a multiplexer, which is applied to an inter-band carrier aggregation system. The inter-band carrier aggregation system includes a multiplexer, a radio frequency transceiver, a power amplifier module, a low noise amplifier module, and an antenna module; the multiplexer includes an antenna port and at least two transceiver / receiver ports. When the at least two transceiver / receiver ports include at least one transmitting port and at least one receiving port, the output end of the radio frequency transceiver is connected to the power amplifier module and the low noise amplifier module; the multiplexer is connected to the power amplifier module through the transmitting port, the multiplexer is connected to the low noise amplifier module through the receiving port, and the multiplexer is also connected to the antenna module through the antenna port;

[0009] The multiplexer includes a transmitting channel and a receiving channel, the transmitting channel includes at least two transmitting filter circuits, and the receiving channel includes at least two receiving filter circuits; each transmitting filter circuit corresponds to a different transmitting frequency band; each receiving filter circuit corresponds to a different receiving frequency band;

[0010] The first end of the transmitting filter circuit is connected to the first end of the receiving filter circuit and serves as an antenna port and is connected to the antenna module to send or receive a radio frequency signal through the antenna port;

[0011] When the multiplexer integrated frequency band includes a frequency division duplex frequency band, and the at least two receiving / transmitting ports include a transmitting port and a receiving port; the second ends of the transmitting filter circuits are interconnected and used as transmitting ports to be connected to the power amplifier module;

[0012] The second ends of the receiving filter circuits are interconnected and used as receiving ports to be connected to the low noise amplifier module.

[0013] Optionally, each transmit filter circuit and / or each receive filter circuit includes a plurality of series resonance units and a plurality of parallel resonance units, and each parallel resonance unit is sequentially arranged at a connection point between each series resonance unit and a ground terminal;

[0014] For any transmitting filter circuit and / or receiving filter circuit, the series resonance unit closest to the transmitting port among the series resonance units is taken as the first target resonance unit; the parallel resonance unit closest to the transmitting port among the parallel resonance units is taken as the second target resonance unit;

[0015] The resonance parameters between the first target resonance unit and the second target resonance unit meet the first preset rule to avoid interference between the transmission filter circuits.

[0016] Optionally, the resonance parameters include wavelength, aperture and number of electrode fingers; the first preset rule is:

[0017] When the resonance parameters of the first target resonance unit satisfy:

[0018] hour;

[0019] The resonance parameters of the second target resonance unit satisfy:

[0020]

[0021] in, is the aperture of the first target resonance unit, is the wavelength of the first target resonance unit; is the number of electrode fingers of the first target resonance unit; is a first characteristic parameter of the first target resonance unit; is the aperture of the second target resonance unit, is the wavelength of the second target resonance unit; is the second characteristic parameter of the second target resonance unit.

[0022] Optionally, when the first target resonance unit includes a plurality of resonators arranged in series, and the second target resonance unit includes a plurality of resonators arranged in parallel, the resonance parameters include wavelength, aperture, and number of electrode fingers; the first preset rule is:

[0023] When all the resonators arranged in series under any first target resonance unit satisfy:

[0024] ;

[0025] For any m or n, the resonance parameters of the second target resonance unit satisfy:

[0026]

[0027] In the formula, The first target resonance unit is m The aperture of the resonator; The first target resonance unit is m The wavelength of the resonator; The first target resonance unit is m The number of electrode fingers per resonator; is a first characteristic parameter of the first target resonance unit; The second target resonance unit is n The aperture of the resonator; The second target resonance unit is n The wavelength of the resonator; The second target resonance unit is n The number of electrode fingers per resonator; is the second characteristic parameter of the second target resonance unit.

[0028] Optionally, when the multiplexer includes at least two transmit filter circuits, the multiplexer further includes a first resonance matching unit; the second end of each transmit filter circuit is connected to the first end of the first resonance matching unit, and the second end of the first resonance matching unit is used as a transmit port and connected to the power amplifier module;

[0029] And / or when the multiplexer includes at least two receiving filter circuits, the multiplexer also includes a second resonant matching unit; the second end of each receiving filter circuit is connected to the first end of the second resonant matching unit, and the second end of the second resonant matching unit serves as a receiving port and is connected to the low noise amplifier module.

[0030] Optionally, the first resonant matching unit and / or the second resonant matching unit includes any one of an L-type, Π-type, and T-type matching circuit.

[0031] Optionally, the series resonance unit and / or the parallel resonance unit is any one of a standard elastic wave resonator, a temperature compensated elastic wave resonator, and a thin film elastic wave resonator.

[0032] Optionally, when the at least two receiving / transmitting ports include a transmitting port and two receiving ports, and the two receiving ports are respectively a first receiving port and a second receiving port;

[0033] The second ends of the transmit filter circuits are interconnected and used as transmit ports to be connected to the power amplifier module;

[0034] The second ends of any number of receiving filter circuits are interconnected and used as a first receiving port to be connected to the low noise amplifier module;

[0035] The second ends of the remaining receiving filter circuits except any number of receiving filter circuits are interconnected and used as second receiving ports to be connected to the low noise amplifier module.

[0036] Optionally, when the multiplexer integrated frequency band further includes a time division duplex frequency band, and the at least two receiving / transmitting ports further include a time division duplex port; the multiplexer further includes at least one time division duplex frequency band filtering circuit;

[0037] Wherein, the first end of the time division duplex frequency band filter circuit is connected to the first end of each transmitting filter circuit and the first end of each receiving filter circuit, and is connected to the antenna module as an antenna port;

[0038] The second end of the time division duplex frequency band filter circuit serves as a time division duplex port and is connected to a power amplifier module or a low noise amplifier module.

[0039] In a second aspect, the present invention further provides an inter-band carrier aggregation system, comprising a radio frequency transceiver, a power amplifier module, a low noise amplifier module, an antenna module and the multiplexer as described in the first aspect above.

[0040] The multiplexer and inter-band carrier aggregation system provided by the present invention have the following beneficial effects:

[0041] The present invention provides a multiplexer and an inter-band carrier aggregation system. The multiplexer is applied to the inter-band carrier aggregation system. The inter-band carrier aggregation system at least includes a radio frequency transceiver, a power amplifier module, a low noise amplifier module, and an antenna module; the multiplexer includes an antenna port and at least two transmit / receive ports, and the output end of the radio frequency transceiver is connected to the power amplifier module and the low noise amplifier module respectively; the multiplexer is connected to the power amplifier module through a transmit port, the multiplexer is connected to the low noise amplifier module through a receive port, and the multiplexer is also connected to the antenna module through an antenna port; the multiplexer includes at least two transmit filter circuits and at least two receive filter circuits; each transmit filter circuit corresponds to a different transmit frequency band; each receive filter circuit corresponds to a different receive frequency band. The first end of the transmit filter circuit is connected to the first end of the receive filter circuit, and as an antenna port, is connected to the antenna module to send or receive radio frequency signals through the antenna port. When the multiplexer integrated frequency band includes a frequency division duplex frequency band, and the at least two transmit / receive ports include a transmit port and a receive port; the second end of the transmit filter circuit is connected to the power amplifier module as a transmit port. The second end of the receiving filter circuit is used as a receiving port and is connected to the low noise amplifier module. Based on this, the multiplexer and inter-band carrier aggregation system provided by the present invention can improve the inter-band carrier performance of the transmitting frequency band and / or the receiving frequency band on the basis of reducing the circuit complexity.

[0042] 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

[0043] 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.

[0044] Figure 1 A schematic structural diagram of an inter-band carrier aggregation system provided by an embodiment of the present invention is shown;

[0045] Figure 2 One of the structural schematic diagrams of the multiplexer provided by the embodiment of the present invention is shown;

[0046] Figure 3 The second structural schematic diagram of the multiplexer provided by the embodiment of the present invention is shown;

[0047] Figure 4 The Smith chart provided by the embodiment of the present invention is shown;

[0048] Figure 5 The third structural schematic diagram of the multiplexer provided by the embodiment of the present invention is shown;

[0049] Figure 6 A fourth structural schematic diagram of a multiplexer provided in an embodiment of the present invention is shown;

[0050] Figure 7 A fifth structural schematic diagram of a multiplexer provided in an embodiment of the present invention is shown;

[0051] Figure 8 The figure shows the channel performance curve corresponding to the common transmitting end B1-B3TX on the multiplexer in the embodiment of the present invention;

[0052] Fig. 9 A sixth structural schematic diagram of a multiplexer provided in an embodiment of the present invention is shown;

[0053] Fig.10 FIG7 shows a seventh structural schematic diagram of a multiplexer provided in an embodiment of the present invention;

[0054] Fig.11 An eighth structural schematic diagram of a multiplexer provided in an embodiment of the present invention is shown;

[0055] Fig.12 A ninth structural diagram of a multiplexer provided in an embodiment of the present invention is shown;

[0056] Fig.13 FIG10 shows a tenth structural schematic diagram of a multiplexer provided in an embodiment of the present invention.

[0057] Icons: 10-inter-band carrier aggregation system; 11-multiplexer; 12-RF transceiver; 13-power amplifier module; 14-antenna module; 15-low noise amplifier module; 21-transmit filter circuit; 22-receive filter circuit; 23-time division duplex band filter circuit; 31-series resonance unit; 32-parallel resonance unit; 31A-first target resonance unit; 32A-second target resonance unit; 33-first resonance matching unit; 34-second resonance matching unit; TX-transmit port; RX-receive port; ANT-antenna port; TRX-independent port. DETAILED DESCRIPTION

[0058] 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.

[0059] 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.

[0060] 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.

[0061] As described in the background technology, the existing carrier aggregation solution has a complex circuit structure and poor carrier performance.

[0062] Based on this, this embodiment provides a communication solution that can improve the inter-band carrier performance of the transmission frequency band and / or the reception frequency band while reducing the circuit complexity.

[0063] Please refer to Figure 1 , Figure 1 A schematic diagram of an inter-band carrier aggregation system is shown; the inter-band carrier aggregation system 10 at least includes a radio frequency transceiver 12, a power amplifier module 13, an antenna module 14, a low noise amplifier module 15 and a multiplexer 11, wherein the multiplexer 11 includes an antenna port ANT and at least two transceiver / receiver ports, and the output end of the radio frequency transceiver 12 is connected to the power amplifier module 13. When the at least two transceiver / receiver ports include at least one transmitting port and at least one receiving port, the output end of the radio frequency transceiver 12 is connected to the power amplifier module 13 and the low noise amplifier module 15; the multiplexer 11 is also connected to the power amplifier module 13 through the transmitting port, the multiplexer 11 is also connected to the low noise amplifier module 15 through the receiving port, and the multiplexer 11 is also connected to the antenna module 14 through the antenna port ANT.

[0064] In this embodiment, each transmit / receive port (transmit port and / or receive port) in the multiplexer integrates at least two transmit filter circuits or at least two receive filter circuits; each transmit filter circuit corresponds to a different transmit frequency band; each receive filter circuit corresponds to a different receive frequency band.

[0065] Based on this, when integrating at least two frequency bands, this embodiment can use a multiplexer to communicate each frequency band with the antenna module through a unified antenna end; communicate with the power amplifier module through a unified transmitting end; and communicate with the low-noise amplifier module through a receiving end.

[0066] Similar to the previous embodiment, please Figure 1 Based on the reference Figure 2 , Figure 2 A schematic diagram of the structure of the multiplexer in this embodiment is shown, where the multiplexer 11 includes a transmitting channel and a receiving channel, wherein the transmitting channel includes at least two transmitting filter circuits 21 and the receiving channel includes at least two receiving filter circuits 22; each transmitting filter circuit 21 corresponds to a different transmitting frequency band; each receiving filter circuit 22 corresponds to a different receiving frequency band.

[0067] A first end of the transmission filter circuit 21 is connected to a first end of the reception filter circuit 22 and serves as an antenna port ANT, connected to the antenna module 14 to transmit or receive a radio frequency signal through the antenna port ANT.

[0068] The second end of each transmit filter circuit 21 may correspond to a transmit port TX, and the second end of each receive filter circuit 22 may correspond to a receive port RX.

[0069] In this embodiment, the transmitting port TX can integrate at least two transmitting filter circuits 21; the receiving port RX can integrate at least two receiving filter circuits 22. Based on this, the number of PA, LNA, switch and port matching components required in the system can be reduced, thereby reducing the circuit complexity of the inter-band carrier aggregation system. At the same time, through reasonable design, the carrier aggregation performance between the integrated TX or RX different frequency bands can be realized inside the multiplexer, which can improve the insertion loss during carrier aggregation compared with the existing solution.

[0070] For example, please refer to Figure 2 When the multiplexer integrated frequency band includes a frequency division duplex frequency band, and at least two transmit / receive ports include a transmit port TX and a receive port RX; the second ends of each transmit filter circuit 21 are interconnected and connected to the power amplifier module 13 as a transmit port TX.

[0071] The second ends of the receiving filter circuits 22 are interconnected and serve as a receiving port RX, connected to the low noise amplifier module 15 .

[0072] It should be noted that, in this embodiment, the transmitting port and / or the receiving port RX may integrate at least two frequency band filter circuits. In this embodiment, the number of frequency bands integrated in the transmitting port and / or the receiving port may be adjusted according to the type of radio frequency device.

[0073] Among them, in this embodiment Figure 2 It is only an example to show the situation that a plurality of transmit filter circuits are integrated into one transmit port TX and a plurality of receive filter circuits are integrated into one receive port RX.

[0074] In another possible implementation, the filter may integrate antenna ends of multiple frequency bands and output from a common antenna port ANT, wherein the receiving ports RX or transmitting ports TX corresponding to the multiple frequency bands, that is, at least one port type, may be integrated together. In this case, the filter includes an antenna port ANT, a transmitting port or a receiving port RX.

[0075] In this embodiment, in order to ensure the inter-band carrier aggregation performance of the transmission frequency band and / or the reception frequency band, the resonance parameters of each link between the merging ports may be adjusted.

[0076] In one possible implementation, Figure 2 Based on the reference Figure 3 , Figure 3 Another structural schematic diagram of the multiplexer in this embodiment is shown, each transmitting filter circuit 21 and / or each receiving filter circuit 22 includes a plurality of series resonance units 31 and a plurality of parallel resonance units 32, and each parallel resonance unit 32 is sequentially arranged at the connection point between each series resonance unit 31 and the ground terminal.

[0077] Among them, for any transmitting filter circuit 21 or receiving filter circuit 22, the series resonance unit 31 closest to the transmitting port among the series resonance units 31 is the first target resonance unit 31A; the parallel resonance unit 32 closest to the transmitting port among the parallel resonance units 32 is the second target resonance unit 32A.

[0078] The resonance parameters between the first target resonance unit 31A and the second target resonance unit 32A satisfy the first preset rule to avoid interference between the transmission filter circuits 21 .

[0079] It should be noted that in this embodiment, the transmitting filter circuit is simply used as an example to simply illustrate the structural schematic diagram of any two transmitting filter circuits in the multiplexer, while the receiving filter circuit and Figure 3 The structures shown are similar.

[0080] In this embodiment, please continue to refer to Figure 3 , taking the transmitting filter circuit 21 of the frequency division duplex B1 band as an example, it includes a The series resonant unit 31 andb The number of parallel resonant units 32 in this embodiment is a Can be equal to the number of series resonant units 31 b The series resonant units 31 are cascaded in sequence, namely 1-S1 (the first series resonant unit 31 in the frequency division duplex B1 band), 1-S2, ..., 1-S a The parallel resonant units 32 are cascaded in sequence, namely 1-P1 (the first parallel resonant unit 32 in the frequency division duplex B1 band), 1-P2, ..., 1-P b .

[0081] Similarly, taking the transmitting filter circuit 21 corresponding to the frequency division duplex B3 frequency band as an example, the series resonant units 31 are cascaded in sequence, namely 3-S1 (the first series resonant unit 31 in the frequency division duplex B3 frequency band), 3-S2, ..., 3-S c The parallel resonant units 32 are cascaded in sequence, namely 3-P1 (the first parallel resonant unit in the frequency division duplex B3 band), 3-P2, ..., 3-P d .

[0082] Taking the transmitting filter circuit corresponding to the frequency division duplex B1 band as an example, the series resonant unit closest to the transmitting port in the frequency division duplex B1 band is the series resonant unit 1-S1, that is, in this embodiment, the series resonant unit 1-S1 is used as the first target resonant unit 31A corresponding to the frequency division duplex B1 band; the parallel resonant unit closest to the transmitting port in the frequency division duplex B1 band is the parallel resonant unit 1-P1, that is, in this embodiment, the parallel resonant unit 1-P1 is used as the second target resonant unit 32A corresponding to the frequency division duplex B1 band.

[0083] Similarly, taking the transmitting filter circuit corresponding to the frequency division duplex B3 band as an example, the series resonant unit closest to the transmitting port in the frequency division duplex B3 band is the series resonant unit 3-S1, that is, the present embodiment uses the series resonant unit 3-S1 as the first target resonant unit 31A corresponding to the frequency division duplex B3 band. The parallel resonant unit closest to the transmitting port in the frequency division duplex B3 band is the parallel resonant unit 3-P1, that is, the present embodiment uses the parallel resonant unit 3-P1 as the second target resonant unit 32A corresponding to the frequency division duplex B3 band.

[0084] The resonance parameters include wavelength, aperture and number of electrode fingers; when the resonance parameters of the first target resonance unit 31A satisfy:

[0085] hour;

[0086] Among them, the resonance parameters of the second target resonance unit 32A need to satisfy:

[0087]

[0088] in, is the aperture of the first target resonance unit 31A, is the wavelength of the first target resonance unit 31A; N 1 is the number of electrode fingers of the first target resonance unit 31A; is the first characteristic parameter, representing the aperture of the first target resonance unit 31A The number of electrode fingers of the first target resonance unit 31A N 1 The product of the two is: M1=A1* N 1 ; is the aperture of the second target resonance unit 32A, is the wavelength of the second target resonance unit 32A; N 2 is the number of electrode fingers of the first target resonance unit 31A; is the second characteristic parameter, representing the aperture of the second target resonance unit 32A. The number of electrode fingers of the second target resonance unit 32A N 2 The product of the two is M2=A2* N 2 .

[0089] Please refer to Figure 4 , Figure 4 The figure shows that in this embodiment, when the filter circuit corresponding to the frequency division duplex B1 band of the transmitting port and the filter circuit corresponding to the frequency division duplex B3 band are disconnected, the Smith curve of the reflection coefficient of the frequency division duplex B1 band transmitting port in the frequency range of the frequency division duplex B3 band is shown. It can be seen that the reflection coefficient is close to the open point on the right side of the Smith circle diagram. Therefore, when the frequency division duplex B1 band and the frequency division duplex B3 band transmitting ports are combined in the embodiment, the signal of the frequency division duplex B1 band rarely leaks to the frequency division duplex B3 band to cause interference.

[0090] In another possible implementation, Figure 3 Based on the reference Figure 5 , Figure 5 FIG. 1 is a schematic diagram showing the structure of the multiplexer in this embodiment. When the first target resonance unit 31A includes a plurality of resonators arranged in series, and the second target resonance unit 32A includes a plurality of resonators arranged in parallel, if the first series resonance unit 1-S1, i.e., the first target resonance unit 31A includes m Resonators arranged in cascade, for example, resonator 1-S11, resonator 1-S12, ..., resonator 1-S1 m; The number of electrode fingers corresponding to each resonator is: N1-S1 1 , ..., N1-S1 m ; The apertures corresponding to each resonator are: A1-S1 1 , …, A1-S1 m ; The wavelengths corresponding to each resonator are: λ1-S1 1 , …, λ1-S1 m The expression of the first characteristic parameter M1 of the first target resonance unit 31A as a whole is: 1 / M 1 =1 / (N 1 *A 1 )+……+1 / (N m *A m ); in this embodiment, specifically: 1 / (M1)=1 / (N1-S1 1 *A1-S1 1 )+……1 / (N1-S1 m *A1-S1 m ).

[0091] It should be noted that That is, the first target resonance unit 31A m The aperture of the resonator, that is, the above value A1-S1 m ; That is, the first target resonance unit 31A m The number of electrode fingers of a resonator, that is, N1-S1 m ; That is, the first target resonance unit 31A m The wavelength of the resonator, that is, λ1-S1 m .

[0092] In this embodiment, the first target resonance unit 31A m Resonator 1-S1 m As an example, the corresponding resonance parameters satisfy: .

[0093] Correspondingly, the first parallel resonance unit 1-P1, that is, the second target resonance unit 32A includes n Resonators arranged in parallel, for example, resonator 1-P11, resonator 1-P12, ..., resonator 1-P1 n ; The corresponding apertures of each resonator are: A1-P11, ..., A1-P1 n ; The number of electrode fingers corresponding to each resonator is: N1-P11, ..., N1-P1 n ; The wavelengths corresponding to each resonator are: λ1-P1 1 , …, λ1-P1n .

[0094] It should be noted that That is, the first n The wavelength of the resonator, that is, λ1-P1 n . That is, the first n The aperture of the resonator, i.e. A1-P1 n . That is, the first n The number of electrode fingers of a resonator, that is, N1-P1 n .

[0095] Among them, for any m and n , with the first target resonance unit 31A under the m Resonator 1-S1 m , with the second target resonance unit n Resonator 1-P1 n As an example, the resonance parameters of the parallel resonator in this embodiment need to meet the following requirements:

[0096] .

[0097] In the formula, is the second characteristic parameter of the second target resonance unit 32A as a whole, satisfying M 2 =N1*A1+……N n *A n In this embodiment, specifically: M2=N1-P1 1 *A1-P1 1 +……+N1-P1 n *A1-P1 n .

[0098] In another possible implementation, the first target resonance unit 31A in this embodiment may include n resonators arranged in parallel, and the corresponding arrangement is similar to that in the previous embodiment. The difference from the previous embodiment is that the first characteristic parameter M1 of the first target resonance unit 31A in this embodiment satisfies: M2=N1-P1 1 *A1-P1 1 +……+N1-P1 n *A1-P1 n Correspondingly, if the second target resonance unit 32A can be m The second characteristic parameter M2 of the whole system satisfies: 1 / (M2)=1 / (N1-S1 1*A1-S1 1 )+……1 / (N1-S1 m *A1-S1 m ).

[0099] In the above three possible implementation methods, the series resonance unit 31 and / or the parallel resonance unit 32 may be any one of a standard elastic wave resonator, a temperature compensated elastic wave resonator, and a thin film elastic wave resonator.

[0100] In addition, please continue to refer to Figure 4 , when the transmission filter circuits of the frequency division duplex B1 frequency band and the frequency division duplex B3 frequency band are integrated in the same transmission port TX, at this time, the transmission filter circuit of the frequency division duplex B1 frequency band and the transmission filter circuit of the frequency division duplex B3 frequency band both meet the above-mentioned first preset rule, based on which, when the combined port is disconnected, the reflection coefficient of the transmission filter circuit of the frequency division duplex B1 frequency band at the same transmission port can be close to an open circuit in the frequency band range corresponding to the frequency division duplex B3 frequency band. Similarly, the reflection coefficient of the transmission filter circuit of the frequency division duplex B3 frequency band at the same transmission port can be close to an open circuit in the frequency band range corresponding to the frequency division duplex B1 frequency band.

[0101] Based on this, whether it is the transmitting port TX or the receiving port RX, the mutual interference between the multiple frequency bands integrated in the same port is minimal, which can improve the inter-band carrier aggregation performance of the transmitting frequency band and / or the receiving frequency band on the basis of reducing the complexity of the circuit.

[0102] For further information, please refer to Figure 6 , Figure 6 Another structural schematic diagram of the multiplexer in this embodiment is shown. When the multiplexer 11 includes at least two transmit filter circuits 21, that is, one transmit port integrates two transmit filter circuits 21, the multiplexer 11 in this embodiment also includes a first resonant matching unit 33; the second end of each transmit filter circuit 21 is connected to the first end of the first resonant matching unit 33, and the second end of the first resonant matching unit 33 is used as a transmit port and is connected to the power amplifier module 13.

[0103] When the multiplexer 11 includes at least two receiving filter circuits, that is, one receiving port RX integrates two receiving filter circuits 22, the multiplexer 11 also includes a second resonant matching unit 34; the second end of each receiving filter circuit 22 is connected to the first end of the second resonant matching unit 34, and the second end of the second resonant matching unit 34 serves as the receiving port RX and is connected to the low noise amplifier module 15.

[0104] It should be noted that in this embodiment Figure 6The multiplexer 11 is shown to be implemented in a manner that includes a first resonant matching unit 33 and a second resonant matching unit 34. When only the first resonant matching unit 33 is included, the second resonant matching unit 34 can be omitted. Similarly, when only the second resonant matching unit 34 is included, the first resonant matching unit 33 can be omitted.

[0105] On this basis, when the multiplexer integrated frequency band also includes a time division duplex frequency band, and at least two receiving / transmitting ports also include a time division duplex TRX port; the multiplexer also includes at least one time division duplex frequency band filter circuit; wherein the first end of the time division duplex frequency band filter circuit is connected to the first end of each transmitting filter circuit and the first end of each receiving filter circuit, and is connected to the antenna module as an antenna port;

[0106] The second end of the time division duplex frequency band filter circuit serves as a time division duplex TRX port and is connected to a power amplifier module or a low noise amplifier module.

[0107] The structural setting of the time-division duplex frequency band filter circuit in this embodiment is the same as the setting of the transmission filter circuit and / or the reception filter circuit, that is, the time-division duplex frequency band filter circuit also includes multiple series resonance units and multiple parallel resonance units, and each parallel resonance unit is sequentially arranged at the connection point between each series resonance unit and the ground terminal.

[0108] Among them, for any transmitting filter circuit and / or receiving filter circuit, the series resonance unit closest to the transmitting port among the series resonance units is the first target resonance unit; the parallel resonance unit closest to the transmitting port among the parallel resonance units is the second target resonance unit.

[0109] Or for any transmitting filter circuit and / or receiving filter circuit, the series resonance unit closest to the receiving port among the series resonance units is used as the first target resonance unit; and the parallel resonance unit closest to the receiving port among the parallel resonance units is used as the second target resonance unit.

[0110] The resonance parameters between the first target resonance unit and the second target resonance unit satisfy a first preset rule to avoid interference between the transmission filter circuits.

[0111] The specific structure of the duplex frequency band filter circuit will not be described in detail here, and reference may be made to the configuration of the transmitting filter circuit and / or the receiving filter circuit in the above embodiments.

[0112] It should be noted that the above diagram is only an exemplary illustration, and the present embodiment does not limit the specific implementation structure of the multiplexer 11, and the time-division duplex frequency band filter circuit and / or receiving filter circuit and / or transmitting filter circuit provided therein can be composed of a first resonant matching unit 33 and / or a second resonant matching unit 34.

[0113] In this embodiment, the first resonance matching unit 33 and / or the second resonance matching unit 34 includes any one of an L-type, a Π-type, and a T-type matching circuit.

[0114] Since the frequency bands integrated in the multiplexer are different, the present invention will exemplarily illustrate the structure of the multiplexer from the following different embodiments.

[0115] It should be noted that the following embodiments only briefly describe the structure of the multiplexer, and the structural setting of any transmitting filter circuit and / or receiving filter circuit in the multiplexer will not be repeated. That is, in the following embodiments, the transmitting filter circuit 21 and / or receiving filter circuit 22 corresponding to each frequency division duplex frequency band are arranged in series and parallel according to the above implementation method, and at the same time, the resonance units on the transmitting filter circuit 21 and / or receiving filter circuit 22 corresponding to each frequency division duplex frequency band meet the resonance rule set in the above embodiment, that is, the first preset rule.

[0116] Embodiment 1

[0117] Please refer to Figure 7 , Figure 7 A structural schematic diagram of the multiplexer in this embodiment is shown. When the integrated frequency band of the multiplexer includes a frequency division duplex frequency band, at least two transmit / receive ports may include a transmitting port TX and a receiving port RX, wherein the transmitting end and the receiving end corresponding to the frequency division duplex frequency band may be respectively integrated in the same port to respectively constitute the transmitting port TX and the receiving port RX.

[0118] Assuming that the multiplexer in this embodiment needs to integrate the frequency division duplex B1 band and the frequency division duplex B3 band, the antenna ends corresponding to the frequency division duplex B1 band and the frequency division duplex B3 band, namely, the B1-ANT port and the B3-ANT port respectively, can be merged into a common antenna port ANT; the transmitting ends corresponding to the frequency division duplex B1 band and the frequency division duplex B3 band, namely, the B1-TX port and the B3-TX port respectively, are merged into one port as a common transmitting end B1-B3TX; the receiving ends corresponding to the frequency division duplex B1 band and the frequency division duplex B3 band, namely, the B1-RX port and the B3-RX port respectively, are merged into one port as a common receiving end B1-B3RX; at this time, the filter only includes three ports.

[0119] Please Figure 7 Based on the reference Figure 8 , Figure 8 The channel performance curve corresponding to the common transmitting end B1-B3TX on the multiplexer in this embodiment is shown. It can be seen that this channel has two filtering passbands at the same time. The multiplexer in this embodiment meets the inter-band CA and improves the inter-band CA performance. At the same time, it can greatly reduce the number of PA, LNA, switch, and matching circuit components in the system, thereby reducing the complexity of the system circuit.

[0120] Embodiment 2

[0121] When the at least two receiving / transmitting ports include a transmitting port and two receiving ports, and the two receiving ports are respectively a first receiving port and a second receiving port; the second ends of the transmitting filter circuits are interconnected and used as transmitting ports to be connected to the power amplifier module 13;

[0122] The second ends of any number of receiving filter circuits are interconnected and used as a first receiving port to be connected to the low noise amplifier module 15;

[0123] The second ends of the receiving filter circuits except the receiving filter circuit connected to the first receiving port are interconnected and connected to the low noise amplifier module 15 as the second receiving port.

[0124] In one possible implementation, please refer to Fig. 9 , Fig. 9 Another structural schematic diagram of the multiplexer in the present embodiment is shown. When the integrated frequency band of the multiplexer includes a frequency division duplex frequency band, such as a frequency division duplex B1 band and a frequency division duplex B3 band, only the transmitting ends of the above-mentioned frequency division duplex B1 band and the frequency division duplex B3 band can be integrated into one port. At this time, at least two receiving / transmitting ports include a transmitting port and two receiving ports RX, and the two receiving ports RX are respectively a first receiving port and a second receiving port.

[0125] For example, the antenna ends corresponding to the frequency division duplex B1 band and the frequency division duplex B3 band, namely, the B1-ANT port and the B3-ANT port, can be merged into a common antenna port ANT; the transmitting ends corresponding to the frequency division duplex B1 band and the frequency division duplex B3 band, namely, the B1-TX port and the B3-TX port, can be merged into one port as a common transmitting end B1-B3TX. At the same time, the receiving ends B1-RX port and the B3-RX port corresponding to the frequency division duplex B1 band and the frequency division duplex B3 band are reserved as the first receiving port and the second receiving port, respectively.

[0126] Based on this, this embodiment can reduce the circuit complexity corresponding to the transmit filter circuit, while improving the inter-band carrier aggregation performance of the transmit frequency band.

[0127] Embodiment 3

[0128] Similar to the previous embodiment, in a possible implementation method, please refer to Fig.10 , Fig.10Another structural schematic diagram of the multiplexer in the present embodiment is shown. When the integrated frequency band of the multiplexer includes a frequency division duplex frequency band, such as a frequency division duplex B1 band and a frequency division duplex B3 band, only the receiving ends of the above-mentioned frequency division duplex B1 band and the frequency division duplex B3 band can be integrated into one port. At this time, at least two receiving / transmitting ports include a receiving port RX and two transmitting ports TX, and the two transmitting ports TX are respectively a first transmitting port and a second transmitting port.

[0129] For example, the antenna ends corresponding to the frequency division duplex B1 band and the frequency division duplex B3 band, namely, the B1-ANT port and the B3-ANT port, can be merged into a common antenna port ANT port; the transmitting ends corresponding to the frequency division duplex B1 band and the frequency division duplex B3 band are retained, namely, the B1-TX port and the B3-TX port are used as the first transmitting port and the second transmitting port respectively. The receiving ends B1-RX port and the B3-RX port corresponding to the frequency division duplex B1 band and the frequency division duplex B3 band are merged into one port as a common receiving end B1-B3RX.

[0130] Based on this, this embodiment can reduce the circuit complexity corresponding to the receiving filter circuit, while improving the inter-band carrier aggregation performance of the receiving frequency band.

[0131] Embodiment 4

[0132] Please Figure 7 Based on the reference Fig.11 , Fig.11 Another structural schematic diagram of the multiplexer in this embodiment is shown. In a structure similar to that in the first embodiment, a dual-mode coupled resonator DMS can be appropriately selected as a series resonant unit in the receiving filter circuit 22. It should be noted that this embodiment does not limit the number of dual-mode coupled resonators.

[0133] Based on this, this embodiment can further improve the area of ​​the receiving filter circuit on the basis of the first embodiment, so that the receiving filter circuit can be miniaturized or more space can be saved in the multiplexer for the transmitting filter circuit, thereby improving the power tolerance of the multiplexer.

[0134] Embodiment 5

[0135] Please Figure 3 Based on the reference Fig.12 , Fig.12 Another structural schematic diagram of the multiplexer in this embodiment is shown. On the basis of the first embodiment, when the multiplexer integrated frequency band also includes a time division duplex frequency band, and at least two receiving / transmitting ports also include a time division duplex port; the multiplexer 11 also includes at least one time division duplex frequency band filter circuit 23, and at this time at least two receiving / transmitting ports include a transmitting port TX, a receiving port RX and an independent port TRX, wherein the time division duplex frequency band filter circuit receives and transmits through the independent port TRX.

[0136] The first end of the time-division duplex frequency band filter circuit 23 is connected to the first end of each transmitting filter circuit 21 and the first end of each receiving filter circuit 22, and is connected to the antenna module 14 as an antenna port ANT. The second end of the time-division duplex frequency band filter circuit 23 is connected to the power amplifier module 13 or the low noise amplifier module 15 as a time-division duplex TRX port.

[0137] The difference between this embodiment and the above-mentioned embodiment 1 is that a time division duplex frequency band filtering circuit can be additionally provided.

[0138] Specifically, in this embodiment, the time division duplex band and the frequency division duplex band are integrated, and all antenna ports ANT of the above time division duplex band and frequency division duplex band can be integrated into a common antenna ANT end. Then the transmitting end corresponding to the frequency division duplex band is merged into a common transmitting TX end, and the corresponding receiving end is merged into a common receiving RX end. If a time division duplex B40 band is included, the signal is sent and received through the independent port TRX.

[0139] Based on this, the present embodiment can be further expanded to support more time division duplex bands and frequency division duplex bands, so that the multiplexer provided by the present embodiment can meet more complex multi-band carrier aggregation applications.

[0140] Embodiment 6

[0141] Please refer to Fig.13 13 shows another structural schematic diagram of the multiplexer in this embodiment. On the basis of the fifth embodiment, if it is necessary to integrate the time division duplex B40 frequency band, the time division duplex B41 frequency band, the frequency division duplex B1 frequency band, and the frequency division duplex B3 frequency band, at this time, at least two receiving / transmitting ports may include a transmitting port TX, a receiving port RX, and a TRX port. Correspondingly, the time division duplex B40 frequency band and the time division duplex B41 frequency band may be combined into one port, namely the TRX port, and the transmitting ends corresponding to the frequency division duplex B1 frequency band and the frequency division duplex B3 frequency band are integrated together to form a common transmitting TX port. Similarly, the receiving ends corresponding to the frequency division duplex B1 frequency band and the frequency division duplex B3 frequency band are integrated together to form a common receiving RX port. In addition, the antenna ports ANT corresponding to the time division duplex B40 frequency band, the time division duplex B41 frequency band, the frequency division duplex B1 frequency band, and the frequency division duplex B3 frequency band are integrated together to form a common ANT end. At this time, the filter has four ports in total.

[0142] Based on this, this embodiment can simultaneously reduce the number of PA, LNA, switch, and port matching circuit components corresponding to the time division duplex and frequency division duplex circuit parts in the system application, reduce the complexity of the system circuit, and improve the CA performance. At the same time, due to the further integration of the TDD filter required by CA, the system area is effectively saved.

[0143] In summary, the present invention provides a multiplexer and an inter-band carrier aggregation system. The multiplexer is applied to the inter-band carrier aggregation system. The inter-band carrier aggregation system at least includes a multiplexer, a radio frequency transceiver, a power amplifier module, a low noise amplifier module, and an antenna module; the multiplexer includes an antenna port and at least two transceiver / receiver ports, and the output end of the radio frequency transceiver is connected to the power amplifier module and the low noise amplifier module respectively; the multiplexer is connected to the power amplifier module through the transmitting port, the multiplexer is connected to the low noise amplifier module through the receiving port, and the multiplexer is also connected to the antenna module through the antenna port. The multiplexer includes a transmitting channel and a receiving channel, the transmitting channel includes at least two transmitting filter circuits, and the receiving channel includes at least two receiving filter circuits; each transmitting filter circuit corresponds to a different transmitting frequency band; each receiving filter circuit corresponds to a different receiving frequency band. The first end of the transmitting filter circuit is connected to the first end of the receiving filter circuit, and is connected to the antenna module as an antenna port. When the integrated frequency band of the multiplexer includes a frequency division duplexing frequency band, and the at least two transceiver / receiver ports include a transmitting port and a receiving port; the second end of the transmitting filter circuit is connected to the power amplifier module as a transmitting port. The second end of the receiving filter circuit serves as a receiving port and is connected to the low noise amplifier module.

[0144] Based on this, the multiplexer and inter-band carrier aggregation system provided by the present invention can improve the inter-band carrier performance of the transmitting frequency band and / or the receiving frequency band while reducing the circuit complexity.

[0145] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0146] 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.

[0147] 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, applied to an inter-band carrier aggregation system, the inter-band carrier aggregation system at least comprising a multiplexer, a radio frequency transceiver, a power amplifier module, a low noise amplifier module, and an antenna module; the multiplexer comprises an antenna port and at least two transceiver / receiver ports, when the at least two transceiver / receiver ports comprise at least one transmitting port and at least one receiving port, the output end of the radio frequency transceiver is respectively connected to the power amplifier module and the low noise amplifier module; the multiplexer is connected to the power amplifier module via the transmitting port, the multiplexer is connected to the low noise amplifier module via the receiving port, and the multiplexer is also connected to the antenna module via the antenna port; characterized in that The multiplexer further includes a transmitting channel and a receiving channel, the transmitting channel includes at least two transmitting filter circuits, and the receiving channel includes at least two receiving filter circuits; each of the transmitting filter circuits corresponds to a different transmitting frequency band; each of the receiving filter circuits corresponds to a different receiving frequency band; The first end of the transmit filter circuit is connected to the first end of the receive filter circuit and serves as the antenna port, connected to the antenna module, so as to send or receive a radio frequency signal through the antenna port; When the multiplexer integrated frequency band includes a frequency division duplex frequency band, and the at least two receiving / transmitting ports include a transmitting port and a receiving port; the second ends of the transmitting filter circuits are interconnected and connected to the power amplifier module as the transmitting port; The second ends of the receiving filter circuits are interconnected and serve as the receiving port, connected to the low noise amplifier module; Each transmitting filter circuit and / or each receiving filter circuit comprises a plurality of series resonant units and a plurality of parallel resonant units, and each of the parallel resonant units is sequentially arranged at a connection point between each of the series resonant units and the ground terminal; wherein, For any transmitting filter circuit and / or receiving filter circuit, the series resonance unit closest to the transmitting port among the series resonance units is used as the first target resonance unit; the parallel resonance unit closest to the transmitting port among the parallel resonance units is used as the second target resonance unit; The resonance parameters between the first target resonance unit and the second target resonance unit satisfy a first preset rule to avoid interference between transmit filter circuits; When the first target resonance unit includes a plurality of resonators arranged in series, and the second target resonance unit includes a plurality of resonators arranged in parallel, the resonance parameters include wavelength, aperture, and number of electrode fingers; the first preset rule is: When the resonators arranged in series under any first target resonance unit all satisfy: ； For any m or n, the resonance parameters of the second target resonance unit satisfy: In the formula, The first target resonance unit is m The aperture of the resonator; The first target resonance unit is m The wavelength of the resonator; The first target resonance unit is m The number of electrode fingers per resonator; is a first characteristic parameter of the first target resonance unit; The second target resonance unit is n The aperture of the resonator; The second target resonance unit is n The wavelength of the resonator; The second target resonance unit is n The number of electrode fingers per resonator; is the second characteristic parameter of the second target resonance unit.

2. The multiplexer according to claim 1, characterized in that: When the multiplexer includes at least two transmit filter circuits, the multiplexer further includes a first resonance matching unit; the second end of each of the transmit filter circuits is connected to the first end of the first resonance matching unit, and the second end of the first resonance matching unit serves as the transmit port and is connected to the power amplifier module; And / or when the multiplexer includes at least two receiving filter circuits, the multiplexer also includes a second resonant matching unit; the second end of each receiving filter circuit is connected to the first end of the second resonant matching unit, and the second end of the second resonant matching unit serves as the receiving port and is connected to the low-noise amplifier module.

3. The multiplexer according to claim 2, characterized in that: The first resonance matching unit and / or the second resonance matching unit includes any one of an L-type, a Π-type, and a T-type matching circuit.

4. The multiplexer according to claim 1, wherein: The series resonance unit and / or the parallel resonance unit is any one of a standard elastic wave resonator, a temperature compensated elastic wave resonator, and a thin film elastic wave resonator.

5. The multiplexer according to claim 1, wherein: When the at least two receiving / transmitting ports include a transmitting port and two receiving ports, and the two receiving ports are respectively a first receiving port and a second receiving port; The second ends of the transmit filter circuits are interconnected and serve as the transmit port, connected to the power amplifier module; The second ends of any number of receiving filter circuits are interconnected and used as the first receiving port to be connected to the low noise amplifier module; The second ends of the remaining receiving filter circuits except the arbitrary number of receiving filter circuits are interconnected and serve as the second receiving port, connected to the low noise amplifier module.

6. The multiplexer according to claim 1, wherein: When the multiplexer integrated frequency band also includes a time division duplex frequency band, and the at least two receiving / transmitting ports also include a time division duplex port; the multiplexer also includes at least one time division duplex frequency band filtering circuit; Wherein, the first end of the time division duplex frequency band filter circuit is connected to the first end of each of the transmitting filter circuits and the first end of each of the receiving filter circuits, and is connected to the antenna module as the antenna port; The second end of the time division duplex frequency band filter circuit serves as the time division duplex port and is connected to the power amplifier module or the low noise amplifier module.

7. An inter-band carrier aggregation system, characterized in that: It comprises a radio frequency transceiver, a power amplifier module, a low noise amplifier module, an antenna module and a multiplexer as claimed in any one of claims 1 to 6.

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