FILTER WITH TWO TYPES OF ACOUSTIC WAVE RESONATORS

Abstract

Acoustic wave device, comprising: a transmitting filter (11) with a first stage operatively connected to an input of a final stage and comprising acoustic volume wave resonators (S1, S2, S3, S4, P1, P2, P3, P4) but no acoustic surface wave resonators, and with the final stage comprising at least one acoustic series surface wave resonator (RA1, RA2) but no acoustic volume wave resonators, wherein an output of the final stage is coupled to a common node (ANT), wherein the transmitting filter (11) is configured to filter a high-frequency signal, and wherein the at least one acoustic surface wave resonator (RA1, RA2) has a higher suppression of a second harmonic of the high-frequency signal than the acoustic volume wave resonators (S1, S2, S3, S4, P1, P2, P3, P4); a receive filter (12) with an input coupled to the common node (ANT) and a receive filter output node; a first loop circuit (42) comprising a first plurality of acoustic surface wave resonators, coupled to the common node (ANT) and to the input of the transmit filter (11), and configured to generate a first anti-phase signal and apply it to a target signal at the input of the transmit filter (11); and a second loop circuit (43) comprising a second plurality of acoustic surface wave resonators, coupled to the receive filter output node and to the input of the transmit filter (11) and configured to generate a second anti-phase signal and apply it separately from the first anti-phase signal to the target signal at the input of the transmit filter (11).

Description

BACKGROUND Technical area

[0001] Embodiments of this disclosure relate to acoustic wave filters. Description of the related technology

[0002] An acoustic wave filter can incorporate a variety of resonators arranged to filter a high-frequency signal. Examples of acoustic wave filters include surface acoustic wave (SAW) filters and bulk acoustic wave (BAW) filters. A film bulk acoustic resonator (FBAR) filter is an example of a BAW filter. An acoustic wave filter can be arranged to filter a high-frequency (RF) signal.

[0003] Acoustic wave filters can be used in electronic high-frequency systems. For example, filters in the high-frequency front end of a mobile phone can include acoustic wave filters. Two acoustic wave filters can be arranged as a duplexer.

[0004] Publication US 2009 / 0315640A1 describes a duplexer with a transmit filter having serial and parallel resonators connected in a conductor configuration, and a receive filter.

[0005] Publication US 2013 / 0314173A1 describes a filter with acoustic wave resonators connected between an input terminal and an output terminal, and a cancellation circuit comprising an input terminal section and an output terminal section connected such that the cancellation circuit is connected in parallel to at least some of the acoustic wave resonators.

[0006] Document US 2013 / 0113576A1 describes a duplexer comprising a transmit filter connected between an antenna port and a transmit port and comprising multiple sound wave resonators, a receive filter connected between the antenna port and a receive port and comprising multiple sound wave resonators, and a delay line connected in parallel to at least one of the multiple sound wave resonators of the transmit filter and the multiple sound wave resonators of the receive filter.

[0007] Document US 6,424,238 B1 describes an acoustic wave filter with a substrate supporting a first chip and a second chip. The first chip and the second chip comprise either a surface wave resonator or a volume wave resonator, with one of the resonators configured as the series resonator of the acoustic wave filter and the other resonator as the shunt resonator of the acoustic wave filter. SUMMARY OF CERTAIN INVENTIVE ASPECTS

[0008] The innovations described in the claims each have several aspects, none of which alone is responsible for its desirable properties. Without limiting the scope of the claims, some outstanding features of this disclosure are now briefly described.

[0009] In one aspect, an acoustic wave device (acoustic wave apparatus) is disclosed. The acoustic wave device may include a transmit filter comprising acoustic volume wave resonators and an acoustic series surface wave resonator coupled between the acoustic volume wave resonators and a transmit output node. The transmit filter may be configured to filter a high-frequency signal. The acoustic wave device also includes a loop circuit coupled to the transmit filter. The loop circuit may be configured to generate an anti-phase signal for a target signal at a specific frequency.

[0010] In some embodiments, the acoustic wave device further includes a receiving filter containing surface acoustic wave resonators. In some embodiments, the transmitting filter and the receiving filter are contained within a duplexer. In some embodiments, the acoustic wave device further includes a second loop circuit coupled to the receiving filter. In some embodiments, the series surface acoustic wave resonator and at least one of the surface acoustic wave resonators are implemented on a common substrate (die). In some embodiments, the loop circuit includes another surface acoustic wave element implemented on the common substrate.

[0011] In some embodiments, the acoustic wave device further includes a receiving filter configured to output an unbalanced (single-ended) high-frequency signal, the receiving filter being coupled to the loop circuit.

[0012] In one aspect, a filter arrangement is disclosed. The filter arrangement may include a first filter coupled to a common node and a second filter coupled to the common node. The second filter may be configured to filter a high-frequency signal. The second filter may include acoustic wave resonators of the first type and an acoustic series wave resonator of the second type, coupled between the acoustic wave resonators of the first type and the common node. The acoustic series wave resonator of the second type may exhibit higher second-harmonic suppression of a high-frequency signal than the acoustic wave resonators of the first type. The filter arrangement may also include a loop circuit coupled to the second filter.The loop circuit can be configured to generate an anti-phase signal for a target signal at a specific frequency.

[0013] In some embodiments, the acoustic wave resonators of the first type are acoustic volume wave resonators, and the acoustic series wave resonator of the second type is an acoustic surface wave resonator. In some embodiments, the loop circuit includes acoustic surface wave elements. In some embodiments, at least one of the acoustic surface wave elements and the acoustic series wave resonator of the second type are arranged on a common substrate.

[0014] In some embodiments, the filter arrangement includes a first substrate containing the acoustic wave resonators of the first type, and a second substrate containing the acoustic series wave resonator of the second type.

[0015] In some embodiments, the first filter includes acoustic wave resonators.

[0016] In some embodiments, the filter arrangement further includes a second loop circuit that is coupled to the first filter.

[0017] In one aspect, a method for processing a high-frequency signal is disclosed. The method may include filtering a high-frequency signal with a transmit filter. The transmit filter may include acoustic volume wave resonators and an acoustic series surface wave resonator coupled between the acoustic volume wave resonators and a transmit output node of the transmit filter. The method may also include suppressing a target signal by applying an anti-phase signal to the target signal at a specific frequency to the transmit filter.

[0018] In some embodiments, the method further includes filtering a second high-frequency signal with a receiving filter that incorporates surface acoustic wave (SAW) resonators. In some embodiments, the transmitting filter and the receiving filter are contained within a duplexer. In some embodiments, the series SAW resonator and at least one of the SAW resonators are implemented on a common substrate. In some embodiments, the receiving filter is configured to output an unbalanced (single-ended) high-frequency signal.

[0019] In some embodiments, the method further includes generating the anti-phase signal by means of a loop circuit coupled to the transmit filter. The loop circuit may include an acoustic surface wave element implemented on the same substrate as the series surface wave resonator.

[0020] In one aspect, a multiplexer is revealed. The multiplexer may include a transmit filter coupled to a common node. The transmit filter may include acoustic volume wave resonators and a series surface wave resonator coupled between the acoustic volume wave resonators and the common node. The transmit filter may be configured to filter a transmit RF signal. The multiplexer may also include a receive filter coupled to the common node. The receive filter may be configured to provide an unbalanced RF receive signal.

[0021] In some embodiments, the multiplexer further includes a loop circuit coupled to the transmit filter. The loop circuit can be configured to generate an anti-phase signal to a target signal at a specific frequency. The loop circuit may include surface acoustic wave (SAW) elements. In some embodiments, the SAW elements and the series SAW resonator are arranged on a common substrate.

[0022] In some embodiments, the transmit filter and the receiver filter are arranged as a duplexer.

[0023] In some embodiments, the transmitting filter includes a shunt surface wave resonator (shunt surface wave resonator) coupled to a node between the acoustic volume wave resonators and the common node.

[0024] In some embodiments, the acoustic volume wave resonators of the transmitting filter are at least 80% of the resonators of the transmitting filter.

[0025] In some embodiments, the receiving filter includes acoustic surface wave resonators.

[0026] In some embodiments, the series surface wave resonator is coupled between all acoustic volume wave resonators of the transmitting wave filter and the common node.

[0027] In some embodiments, the multiplexer further includes two filters coupled to the common node. The multiplexer can be configured as a quadplexer.

[0028] In one aspect, a filter arrangement is disclosed. The filter arrangement may include a first filter coupled to a common node. The first filter may be configured to provide an asymmetrical high-frequency output signal. The filter arrangement may also include a second filter coupled to the common node and configured to filter a high-frequency signal. The second filter may include acoustic wave resonators of the first type and an acoustic series surface wave resonator of the second type, coupled between the acoustic wave resonators of the first type and the common node. The acoustic series wave resonator of the second type may exhibit higher second-harmonic suppression of a high-frequency signal than the acoustic wave resonators of the first type.

[0029] In some embodiments, the acoustic wave resonators of the first type are acoustic volume wave resonators, and the acoustic series wave resonator of the second type is an acoustic surface wave resonator. In some embodiments, the acoustic volume wave resonators and the acoustic series surface wave resonator are implemented on a common filter substrate and enclosed in a common cap.

[0030] In some embodiments, the filter arrangement includes a first substrate containing the acoustic wave resonators of the first type, and a second substrate containing the acoustic series surface wave resonator of the second type.

[0031] In some embodiments, the first filter includes acoustic wave resonators of the first type.

[0032] In some embodiments, the filter arrangement further includes a loop circuit coupled to the second filter. The loop circuit can be configured to generate an anti-phase signal to a target signal at a specific frequency. In some embodiments, the loop circuit includes acoustic wave elements on the same substrate as the acoustic wave resonators of the second type. In some embodiments, the first filter is a receive filter, the second filter is a transmit filter, and the first and second filters are contained within a duplexer.

[0033] In one aspect, a wireless communication device is disclosed. The wireless communication device may include an antenna and a multiplexer coupled to the antenna. The multiplexer may include a receive filter configured to provide an unbalanced high-frequency receive signal. The multiplexer may also include a transmit filter comprising acoustic volume wave resonators and an acoustic series surface wave resonator coupled between the acoustic volume wave resonators and the antenna. The transmit filter may be configured to filter a transmit high-frequency signal.

[0034] In some embodiments, the wireless communication device further includes a loop circuit coupled to the transmit filter. The loop circuit can be configured to generate an anti-phase signal to a target signal at a specific frequency.

[0035] In some embodiments, the transmitting filter and the receiving filter are arranged as a duplexer, and the receiving filter includes acoustic surface wave resonators.

[0036] In one aspect, an acoustic wave device is disclosed. The acoustic wave device may include a transmit filter comprising acoustic volume wave resonators and an acoustic series surface wave resonator coupled between the acoustic volume wave resonators and a transmit output node. The acoustic wave device may also include a receive filter comprising acoustic surface wave resonators. The receive filter may be coupled to the transmit filter at a common node. The transmit and receive filters may be contained within a multiplexer. The acoustic wave device may also include a loop circuit coupled to the receive filter. The loop circuit may be configured to generate an anti-phase signal to a target signal at a specific frequency.

[0037] In some embodiments, the multiplexer is a duplexer.

[0038] In some embodiments, the acoustic wave device further includes a second loop circuit that is coupled to the transmitting filter.

[0039] In some embodiments, the series surface wave resonator and at least one of the surface wave resonators are implemented on a common substrate. In some embodiments, the loop circuit includes an acoustic surface wave element implemented on the common substrate.

[0040] In some embodiments, the receiving filter is configured to output an unbalanced (single-ended) high-frequency signal.

[0041] In one aspect, a filter arrangement is disclosed. The filter arrangement may include a first filter coupled to a common node and a second filter coupled to the common node. The second filter may be configured to filter a high-frequency signal. The second filter may include acoustic wave resonators of the first type and an acoustic series surface wave resonator of the second type, coupled between the acoustic wave resonators of the first type and the common node. The acoustic series wave resonator of the second type may exhibit higher second-harmonic suppression of a high-frequency signal than the acoustic wave resonators of the first type. The filter arrangement may also include a loop circuit coupled to the first filter.The loop circuit can be configured to generate an anti-phase signal to a target signal at a specific frequency.

[0042] In some embodiments, the acoustic wave resonators of the first type are acoustic volume wave resonators and the acoustic series wave resonator of the second type is an acoustic surface wave resonator.

[0043] In some embodiments, the filter arrangement includes a first substrate containing the acoustic wave resonators of the first type, and a second substrate containing the acoustic series wave resonator of the second type.

[0044] In some embodiments, the first filter includes acoustic wave resonators.

[0045] In some embodiments, the filter arrangement further includes a second loop circuit coupled to the second filter. In some embodiments, the loop circuit includes acoustic wave resonators of the second type. In some embodiments, the acoustic wave resonators of the second type and the acoustic series wave resonators of the second type are arranged on a common substrate.

[0046] In some embodiments, the first filter is configured to output an asymmetrical high-frequency signal.

[0047] In one aspect, a method for processing a high-frequency signal is disclosed. The method may include filtering a transmit high-frequency signal with a transmit filter. The transmit filter may include acoustic volume wave resonators and an acoustic series surface wave resonator coupled between the acoustic volume wave resonators and a transmit output node. The method may also include filtering a receive high-frequency signal with a receive filter. The receive filter may include acoustic wave resonators. The method may further include suppressing a target signal by applying an anti-phase signal to the receive filter with respect to the target signal at a specific frequency.

[0048] In some embodiments, the acoustic wave resonators of the receiving filter include acoustic surface wave resonators. In some embodiments, the series surface wave resonator and at least one of the surface wave resonators are implemented on a common substrate.

[0049] In some embodiments, the transmit filter and the receive filter are contained in a duplexer.

[0050] In some embodiments, the receiving filter is configured to output an asymmetrical received high-frequency signal.

[0051] In some embodiments, the suppression involves generating the anti-phase signal by means of a loop circuit coupled to the transmit filter.

[0052] To summarize the disclosure, certain aspects, advantages, and novel features of the innovations are described here. It should be noted that not all of these advantages can necessarily be achieved in accordance with every particular embodiment. Thus, the innovations may be implemented or carried out in a manner that achieves or optimizes one advantage or group of advantages as taught herein, without necessarily achieving other advantages as taught or suggested herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Embodiments of this disclosure are described with the aid of non-limiting examples based on the accompanying drawings. Fig. Figure 1A is a schematic diagram of a duplexer with a transmit filter, which includes bulk acoustic wave (BAW) resonators and surface acoustic wave (SAW) resonators according to one embodiment. Fig. Figure 1B is a schematic diagram of a multiplexer with a transmit filter including BAW resonators and SAW resonators according to one embodiment. Fig. Figure 2 is a diagram showing the properties of the transmit filter of Fig. 1A compares with a corresponding transmitting filter in which all acoustic wave resonators are BAW resonators. Fig. Figure 3A is a schematic diagram of a duplexer with a loop circuit and a transmit filter, which includes BAW resonators and SAW resonators according to one embodiment. Fig. Figure 3B is a schematic diagram of a multiplexer with loop circuits and transmit filters, each including BAW resonators and SAW resonators according to one embodiment. Fig. Figure 3C is a schematic diagram of a duplexer with a loop circuit coupled to a transmit filter including BAW resonators and SAW resonators, and another loop circuit coupled to a receive filter, according to one embodiment. Fig. Figure 3D is a schematic diagram of a duplexer with a transmit filter including BAW resonators and SAW resonators, and a loop circuit coupled to a receive filter according to one embodiment. Fig. Figure 3E is a schematic diagram of a duplexer with a transmit filter including BAW resonators and SAW resonators, and a loop circuit coupled to a receive filter according to another embodiment. Fig. Figure 4 is a schematic diagram of the resonators of an exemplary loop circuit. Fig. 3A. Fig. Figure 5 is a schematic diagram of a duplexer with a transmitting filter, which includes two types of resonators according to one embodiment. Fig. Figure 6A is a schematic diagram of a duplexer with a loop circuit and a transmit filter, which includes two types of resonators according to one embodiment. Fig. Figure 6B is a schematic diagram of a duplexer with a loop circuit coupled to a transmit filter, which includes two types of resonators and another loop circuit coupled to a receive filter according to one embodiment. Fig. Figure 7 is a schematic block diagram of an exemplary high-frequency system that includes a duplexer according to one embodiment. Fig. Figure 8A is a block diagram of a filter arrangement with substrate, which includes acoustic wave resonators of filters according to the embodiments described herein. Fig. Figure 8B is a block diagram of a filter arrangement with a filter substrate, comprising a first filter component and a second filter component according to the embodiments described herein. Fig. Figure 9 is a schematic block diagram of a module that includes an antenna switch and duplexer according to one or more embodiments. Fig. Figure 10 is a schematic block diagram of a module comprising a power amplifier, a high-frequency switch and a duplexer according to one or more embodiments. Fig. Figure 11 is a schematic block diagram of a module comprising a power amplifier, a high-frequency switch, a duplexer according to one or more embodiments, and an antenna switch. Fig. Figure 12 is a schematic block diagram of a wireless communication device that includes filters according to one or more embodiments. DETAILED DESCRIPTION OF THE CERTAIN EMBODIMENTS

[0054] The following detailed description of certain embodiments presents various descriptions of specific embodiments. However, the innovations described herein can be implemented in a variety of ways, such as those defined and covered by the claims. Reference is made in this description to the drawings, in which similar reference numerals may denote identical or functionally similar elements. It is understood that the elements shown in the figures are not necessarily to scale. Furthermore, it should be noted that certain embodiments may include more elements than are shown in a drawing and / or are represented by a subset of the elements shown in a drawing. In addition, some embodiments may include any suitable combination of features from two or more drawings.

[0055] A high-frequency front end can include a duplexer, which comprises a transmit filter and a receive filter. The transmit filter can be coupled between a transmit path and an antenna. The receive filter can be coupled between a receive path and the antenna. A common node of the duplexer can couple both the transmit and receive filters to the antenna.

[0056] Some duplexers may include a transmit filter, which contains BAW (Bulk Acoustic Wave) resonators arranged as a ladder filter, and a receive filter, which contains SAW (Surface Acoustic Wave) resonators arranged as another ladder filter. In such duplexers, second-order distortion of the BAW resonators in the transmit filter can cause transmit harmonics and / or antenna mismatches.

[0057] Aspects of this disclosure relate to a transmit filter that includes BAW resonators and a SAW resonator coupled between the BAW resonators and a transmit output node of the transmit filter. The transmit filter may exhibit reduced second harmonic distortion compared to a transmit filter that includes only BAW resonators. The SAW resonator of the transmit filter may be part of the same chip as the SAW resonators of a receive filter in a duplexer that includes both the transmit and receive filters. This may improve antenna matching. A loop circuit may be integrated as part of the duplexer. The loop circuit may improve the stability of the duplexer and / or suppress noise. The receive filter may output an unbalanced high-frequency signal.The loop circuit can be less complex and / or more effective if a receive filter is arranged to output a single-ended high-frequency (unbalanced) signal, compared to a receive filter arranged to output a differential high-frequency signal.

[0058] Fig. Figure 1A is a schematic diagram of a duplexer 10 according to one embodiment. The duplexer 10 includes a transmit filter 11 and a receive filter 12, which are coupled to each other at an antenna node ANT. A shunt inductor ANTL may be connected to the antenna node ANT. The transmit filter 11 and the receive filter 12 are both acoustic waveguide filters in the duplexer 10. The transmit filter 11 and the receive filter 12 can filter high-frequency signals. For example, these filters can filter a Band 7 signal, in which a transmit filter 11 can filter a signal with a frequency in the range of 2500 MHz to 2570 MHz, and the receive filter can filter a signal with a frequency in the range of 2620 MHz to 2690 MHz.

[0059] The receive filter 12 can be implemented using SAW resonators RB1, RB2, RB3, RB4, RB5, RB6, RB7, RB8, RB9, and RBA. Accordingly, the receive filter 12 can be referred to as a SAW filter. The receive filter 12 can filter a high-frequency signal received at the antenna node ANT. The receive output node RX of the receive filter 12 can provide an unbalanced high-frequency receive signal.

[0060] The transmit filter 11 can filter a high-frequency signal and provide a filtered high-frequency signal at the antenna node ANT. A series inductor TXL can be coupled between the transmit input node TX and the acoustic wave resonators of the transmit filter 11. The transmit filter 11 can suppress harmonics. The transmit filter 11 includes BAW resonators S1, S2, S3, S4, P1, P2, P3, and P4, as well as SAW resonators RA2 and RA1. Accordingly, the transmit filter 11 can be described as a hybrid BAW and SAW transmit filter. The depicted transmit filter 11 includes a SAW resonator RA1 in a final stage of the transmit filter 11. As shown, the transmit filter 11 includes BAW resonators and a SAW resonator RA1, in which the SAW resonator RA1 is coupled between the BAW resonators and a transmit output node or the antenna node ANT.The depicted transmit filter 11 also includes a shunt SAW resonator RA2, which is coupled at a node between the BAW resonators of the transmit filter 11 and the antenna node ANT. Any number of SAW resonators can be coupled between the BAW resonators of the transmit filter and the antenna node ANT. For example, a series SAW resonator and one or more other series SAW resonators and / or one or more shunt SAW resonators can be coupled between the BAW resonators of the transmit filter and the antenna node ANT.

[0061] If a transmit filter consists solely of BAW resonators in a duplexer that also includes a receive filter with only SAW resonators, the harmonic characteristics can degrade due to asymmetric second-order distortion. In duplexer 10, the use of the SAW resonator in the final stage of the transmit filter 11 suppresses this distortion and degradation of the second-order harmonic characteristics. Furthermore, integrating the SAW resonator of the transmit filter 11 into the same SAW chip as the SAW resonators of the receive filter 12 improves antenna matching compared to other duplexers.

[0062] Fig. Figure 1B is a schematic diagram of a multiplexer 10' according to one embodiment. The multiplexer 10' includes transmit filters 11' and filters 12' coupled together at an antenna node ANT. The multiplexer 10' shown includes a first transmit filter, a first receive filter, an nth transmit filter, and an nth receive filter. In some embodiments, the number of transmit filters 11' and the number of receive filters 12' may differ.

[0063] Each of the transmitting filters 11' can have the same or generally a similar structure to the transmitting filter 11 from Fig. exhibit 1A. Likewise, any receiving filter 12' can have the same or generally similar structure as receiving filter 12 made of Fig. exhibit 1A. The two depicted transmit filters of transmit filter 11' and the two depicted receive filters of the in Fig. The receive filters 12' shown in Figure 1B incorporate the same SAW and BAW resonator topology. For example, the first transmit filter and the first receive filter of multiplexer 10' can be connected to the transmit filter 11 and the receive filter 12 of Fig. 1A. The second receive filter of the multiplexer 10' can include SAW resonators RB1n, RB2n, RB3n, RB4n, RB5n, RB6n, RB7n, RB8n, RB9n, and RBAn and provide an unbalanced high-frequency signal at the receive output node RXn. The second transmit filter of the multiplexer 10' includes a series inductor TXLn coupled between a transmit input node TXn and the acoustic wave resonators of the second transmit filter. As shown, the acoustic wave resonators of the second transmit filter include the BAW resonators S1n, S2n, S3n, S4n, P1n, P2n, P3n, and P4n, as well as the SAW resonators RA2n and RA1n. In other embodiments, however, one or more of the transmit filters 11' may include different resonator topologies, including a different number and / or different combinations of SAW and BAW resonators. Likewise, the receive filters 12' may include different resonator topologies.

[0064] Fig. Figure 2 is a diagram showing the properties of the transmitting filter 10. Fig. 1A compares to a corresponding transmitting filter in which all acoustic wave resonators are BAW resonators. The graph shows that filter 10 of Fig. 1A suppresses the distortion and deterioration of the second order harmonic characteristics compared to the corresponding BAW resonator transmitting filter.

[0065] Fig. Figure 3A is a schematic diagram of a duplexer 40 with a loop circuit 42 according to one embodiment. The duplexer 40 is like the duplexer 10 of Fig. 1A, except that the duplexer 40 includes the loop circuit 42. The duplexer 40 also includes the capacitors C1, C2, C3, C4, and C5, which couple the resonators of the loop circuit 42 to the transmit filter 11 and / or the receive filter 12. The capacitors C1, C2, C3, C4, and C5 shown can function as damping elements. In some other implementations, another damping element, such as a resistor and / or an inductor, can be added alternatively or additionally to any embodiment disclosed herein as suitable. The capacitors C1, C2, C3, C4, and C5 and / or other damping elements can, in certain cases, be considered part of a loop circuit.

[0066] The loop circuit 42 shown is coupled to the transmit filter 11. The loop circuit 42 can be coupled to an input resonator S1 and an output resonator RA1 of the transmit filter 11. In some other cases, the loop circuit 42 can be coupled to one or more other nodes of the ladder circuit of the transmit filter 11 than shown. The loop circuit 42 can include SAW elements, such as SAW resonators and / or SAW delay lines. One or more SAW elements of the loop circuit 42 can be located on the same substrate or chip as one or more SAW resonators of the transmit filter 11 and / or the receive filter 12. The loop circuit 42 can improve the receive isolation and / or the attenuation of the carrier aggregation band.

[0067] The loop circuit 42 can suppress and / or cancel an unwanted frequency component. The loop circuit 42 can improve transmit / receive isolation and attenuation for a specific frequency range. The loop circuit 42 can feed a cancellation signal to the transmit filter 11, wherein the cancellation signal has approximately the same amplitude and an opposite phase to a signal component to be canceled. The loop circuit 42 can apply a signal with approximately the same amplitude and an opposite phase to a signal component to be canceled. The loop circuit 42 can apply the signal with approximately the same amplitude and an opposite phase to a signal component to be canceled to the transmit filter 11. The loop circuit 42 can be implemented in accordance with all suitable principles and advantages described in U.S. Patent 9,246,533 B2 and / or U.S. Patent 9,520,857 B2.

[0068] In a duplexer with a pure BAW transmit filter and a pure SAW receive filter, a loop circuit connection section at an antenna connector can be a chip boundary. Accordingly, there is a possibility that noise can occur as a result of connections between the chips. In the circuit configuration of Fig. 3A A SAW resonator of the final stage of the transmit filter 11 and a SAW resonator of the receive filter, coupled to the antenna node ANT, can be located side by side on the same substrate. Such SAW resonators can also be arranged on the same substrate as the SAW elements of the loop circuit 42. Therefore, interference and / or other distortions resulting from a connection between the chips can be negligible.

[0069] The loop circuit 42 can operate better with an asymmetrical high-frequency receiving signal than with a differential high-frequency receiving signal. For example, the loop circuit 42 can suppress an unwanted frequency more efficiently and / or with fewer circuit elements when using an asymmetrical high-frequency receiving signal than when using the loop circuit 42 with a differential high-frequency receiving signal.

[0070] Fig. Figure 3B is a schematic diagram of a multiplexer 40' with loop circuits 42 and 42n according to one embodiment. The multiplexer 40' is like the multiplexer 10' of Fig. 1B, except that the multiplexer 40' includes the loop circuits 42 and 42n. The multiplexer 40' also includes the capacitors C1, C2, C3, C4, and C5, which couple the elements of the loop circuit 42 to a first transmit filter of the transmit filters 11' and / or a first receive filter of the receive filters 12'. Likewise, the multiplexer 40' includes the capacitors C1n, C2n, C3n, C4n, and C5n, which couple the elements of the loop circuit 42n to a second transmit filter of the transmit filters 11' and / or a second receive filter of the receive filters 12'. The loop circuits 42 and 42n may be similar or substantially the same in certain embodiments. According to some other embodiments, the loop circuits 42 and 42n may be configured differently.

[0071] Fig. Figure 3C is a schematic diagram of a duplexer 44 with loop circuits 42 and 43 according to one embodiment. The duplexer 44 is like the duplexer 40 of Fig. 3A, except that the duplexer 44 additionally includes the loop circuit 43. The duplexer 44 also includes the capacitors C1, C2, C3, C4, C5, C6, and C7, which couple the elements of the loop circuits 42 and 43 to the transmit filter 11 and / or the receive filter 12. In some embodiments, the loop circuit 43 can also be coupled to a node between the transmit input node TX and the BAW resonators of the transmit filter 11. The loop circuit 43 can supply a quenching or cancellation signal to the receive filter 12, wherein the quenching signal has approximately the same amplitude and an opposite phase to a signal component to be quenched.

[0072] The loop circuit 42 shown is coupled to the transmit filter 11, and the loop circuit 43 shown is coupled to the receive filter 12. The loop circuit 42 can be coupled to an input resonator S1 and an output resonator RA1 of the transmit filter 11. In some other cases, the loop circuit 42 can be coupled to one or more other nodes of the ladder circuit of the transmit filter 11 than shown. The loop circuit 43 can be coupled to an input resonator RB1 and an output resonator RB9 of the receive filter 12. In some other cases, the loop circuit 43 can be coupled to one or more other nodes of the ladder circuit of the receive filter 12 than shown.

[0073] The loop circuits 42 and 43 can include SAW elements, such as SAW resonators and / or delay lines. One or more SAW elements of the loop circuit 42 can be located on the same chip as one or more SAW resonators of the transmit filter 11 and / or the receive filter 12. Likewise, one or more SAW elements of the loop circuit 43 can be located on the same substrate as one or more SAW resonators of the transmit filter 11 and / or the receive filter 12. The loop circuits 42 and 43 can improve the receive isolation and / or the attenuation of the carrier aggregation band.

[0074] As with the above in relation to Fig. As described in Section 3A, the loop circuit 42 can be used by the loop circuit 43 to suppress and / or cancel or eliminate an unwanted frequency component. The loop circuit 43 can improve transmit / receive isolation and attenuation for a specific frequency range. The loop circuit 43 can apply a signal with approximately the same amplitude and opposite phase to a signal component to be canceled. The loop circuit 43 can be implemented in accordance with all suitable principles and advantages described, for example, in U.S. Patent No. 9,246,533 and / or U.S. Patent No. 9,520,857.

[0075] Fig. Figure 3D is a schematic diagram of a duplexer 46 with a loop circuit 43 according to one embodiment. The duplexer 46 is like the duplexer 44 of Fig. 3C, except that the duplexer 46 is not the one in Fig. The loop circuit 42 shown in Figure 3C is included. The duplexer 46 also includes capacitors C6 and C7, which couple the elements of the loop circuit 43 to the receive filter 12. In the illustrated embodiment, capacitor C6 is coupled between the antenna node ANT and the SAW resonator RB1, and capacitor C7 is coupled between the SAW resonator RB9 and the receive output node RX. The duplexer 46 can be used in situations where the suppression and / or cancellation of an unwanted frequency component in a receive filter of a duplexer is desired and where the specifications of the duplexer can be met without a loop circuit for the transmit filter 11.

[0076] Fig. Figure 3E is a schematic diagram of a duplexer 48 with a loop circuit 43' according to one embodiment. The duplexer 48 is like the duplexer 46 of Fig. 3D, except that the loop circuit 43' of the duplexer 48 is also coupled to a node between the transmit input node TX and the BAW resonator S1. The elements of the loop circuit 43' may also differ from the elements of the loop circuit 43. The duplexer 48 also includes the capacitors C5, C6, C7, and C8, which couple the elements of the loop circuit 43 to the transmit filter 11 and / or the receive filter 12.

[0077] Fig. Figure 4 is a schematic diagram of the resonators of an exemplary loop circuit 50. The loop circuit 50 is an example of the loop circuit 42 of the Fig. 3A, Fig. 3B and Fig. 3C, the loop circuit 43 of the Fig. 3C and Fig. 3D and / or the loop circuit 43' of the Fig. 3E. The loop circuit 50 shown includes the SAW elements 51, 52, 53, 54 and 55. As shown, the SAW elements each include an interdigital converter electrode.

[0078] While the Fig. 1A, 3A and 3C-3E are exemplary duplexers with SAW and BAW resonators, illustrating the Fig. 1B and Fig. 3B. Further exemplary multiplexers with SAW and BAW resonators illustrate that all the suitable principles and advantages described here can be implemented by various suitable types of acoustic wave resonators. For example, a filter of a duplexer can include acoustic wave resonators of the first type and an acoustic series wave resonator of the second type, coupled between the acoustic wave resonators of the first type and a common node of the duplexer. The second type of acoustic wave resonator can exhibit higher second harmonic suppression of a high-frequency signal than the first type of acoustic wave resonator. For example, in duplexer 10 of Fig. 1A and in the duplexer 40 of Fig. 3A The first resonator type is a BAW resonator and the second resonator type is a SAW resonator. In some cases, the first resonator type may be a BAW resonator and the second resonator type an acoustic limiting wave resonator.

[0079] Fig. Figure 5 is a schematic diagram of a duplexer 60 with a transmit filter 61, which includes two types of resonators according to one embodiment. The duplexer 60 also includes a receive filter 62. The duplexer 60 includes a first type of acoustic wave resonator and a second type of acoustic wave resonator. The second type of acoustic wave resonator can exhibit higher suppression of a second harmonic of a high-frequency signal than the first type of acoustic wave resonator. The duplexer 60 of Fig. 1A is an example of the Duplexer 60, where the first type of acoustic wave resonator is a BAW resonator and the second type of acoustic wave resonator is a SAW resonator.

[0080] The transmit filter 61 and the receive filter 62 can filter high-frequency signals. The transmit filter 61 includes the resonators TS1, TS2, TS3, TS4, TP1, TP2, TP3, and TP4, as well as the resonators TA2 and TA1 of the first type. The receive filter 62 can be implemented using resonators TB1, TB2, TB3, TB4, TB5, TB6, TB7, TB8, TB9, and TBA of the first type. The receive filter 62 can filter a high-frequency signal received at the antenna node ANT. The receive output node RX of the receive filter 62 can provide an unbalanced high-frequency receive signal.

[0081] If a transmit filter consists only of second-type resonators in a duplexer that also includes a receive filter with only first-type resonators, the harmonic characteristics can degrade due to asymmetric second-order distortion. In duplexer 60, the use of the first-type resonator in the final stage of transmit filter 61 suppresses this distortion and degradation of the second-order harmonic characteristics. Furthermore, integrating the standard first-type resonator of transmit filter 61 into the same first-type resonator chip as the first-type resonators of receive filter 62 improves antenna matching compared to other duplexers.

[0082] Fig. Figure 6A is a schematic diagram of a duplexer 90 with a loop circuit 42 according to one embodiment. The duplexer 90 is like the duplexer 60 of Fig. 5, except that the duplexer 90 includes the loop circuit 42. The duplexer 90 also includes the capacitors C1, C2, C3, C4, and C5, which couple the resonators of the loop circuit 42 with the transmit filter 61 and / or the receive filter 62. The loop circuit 42 of the duplexer 90 can implement all the suitable principles and advantages of any of the loop circuits described here.

[0083] Fig. Figure 6B is a schematic diagram of a duplexer 92 with a loop circuit 42, 43 according to one embodiment. The duplexer 92 is like the duplexer 90 of Fig. 6A, except that the duplexer 92 includes the loop circuit 43. The duplexer 92 includes capacitors C1, C2, C3, C4, C5, C6, and C7, which couple elements of the loop circuits 42 and 43 with the transmit filter 61 and / or the receive filter 62. The loop circuit 43 of the duplexer 92 can implement all the suitable principles and advantages of any of the loop circuits described here.

[0084] Although some of the embodiments described here can be described with reference to duplexers, all suitable principles and advantages described here can be applied, for example, to multiplexers, as in the Fig. 1B and Fig. Figure 3B illustrates this. A multiplexer can include any number of filters coupled to a common node. For example, a multiplexer can be a duplexer, a triplexer with three filters, a quadplexer with four filters, a pentaplexer with five filters, a hexaplexer with six filters, an octoplexer with eight filters, and so on. In some cases, a multiplexer can include 2 to 16 acoustic wave filters connected to a common node. The acoustic wave filters of a multiplexer can include any suitable combination of receive filters and / or transmit filters. One or more filters of a multiplexer can include acoustic wave resonators of two types, according to the suitable principles and advantages described herein.

[0085] Although the embodiments discussed herein may relate to transmitting filters incorporating two types of acoustic wave resonators, all suitable principles and advantages described herein may be appropriately applied to receiving filters. For example, receiving filters may incorporate two or more types of acoustic wave resonators. Furthermore, although the embodiments discussed herein may relate to filters incorporating two types of acoustic wave resonators, three or more types of acoustic wave resonators may be incorporated into a filter according to the principles and advantages disclosed herein.

[0086] The duplexers and other multiplexers presented herein can be used in a variety of high-frequency systems. High-frequency systems can process signals with frequencies in the range of approximately 30 kHz to 300 GHz, for example, in the range of approximately 450 MHz to 6 GHz. The filters disclosed herein can be used in high-frequency systems such as bandpass filters with a passband in the range of approximately 450 MHz to 6 GHz. The passband of a bandpass filter with two types of acoustic wave resonators can correspond to a frequency band of any suitable communication standard, such as Long Term Evolution (LTE) and / or 5G New Radio (NR). In some cases, the principles and advantages disclosed herein can be applied to filters arranged for filtering radio frequencies up to and including millimeter wave frequencies.

[0087] Fig. Figure 7 is a schematic block diagram of an exemplary high-frequency system 100, which includes a duplexer 101 according to one embodiment. The illustrated high-frequency system 100 includes a duplexer 101, a transmit signal path 102, a receive signal path 103, and an antenna 104. The duplexer 101 can implement any suitable combination of features of the duplexers described herein. The transmit signal path 102 can include a power amplifier and / or suitable circuitry configured to provide a high-frequency signal to the duplexer 101. The illustrated duplexer 101 includes a transmit filter arranged to filter a high-frequency signal provided by the transmit signal path 102 and to provide a filtered high-frequency transmit signal. The antenna 104 can transmit the filtered high-frequency transmit signal received by the duplexer 101.The illustrated duplexer 101 includes a receive filter arranged to filter a high-frequency signal received from the antenna 104 and to provide a filtered high-frequency receive signal for the receive signal path 103. The receive signal path 103 may include a low-noise amplifier and / or suitable circuitry for processing the filtered high-frequency receive signal.

[0088] Fig. Figure 8A is a block diagram of a filter arrangement 110 with a different substrate, which includes acoustic wave resonators of one or more filters according to the embodiments described herein. As shown, the filter arrangement 110 includes a SAW substrate 112 and a BAW substrate 114 arranged on a common substrate 116. One or more acoustic wave filters can include resonators implemented on the SAW substrate 112 and the BAW substrate 114. According to certain embodiments, the BAW substrate 114 can be a film bulk acoustic resonator (FBAR) substrate. The substrate 116 can be a laminated substrate or another suitable packaging substrate. Resonators of one or more acoustic wave filters of a duplexer or other multiplexer can be implemented on the SAW substrate 112 and the BAW substrate 114.For example, a transmit filter of a duplexer can include resonators of the SAW chip 112 and the BAW chip 114 according to the suitable principles and advantages described herein. Resonators of a receive filter of the duplexer can include resonators of the SAW chip 112. According to certain embodiments, a loop circuit includes SAW elements of the SAW substrate 112. Resonators of one or more duplexers or other multiplexers can be implemented on the SAW chip 112 and the BAW chip 114. For example, resonators for multiple duplexers can be implemented on the SAW chip 112 and / or the BAW chip 114.

[0089] In some embodiments, different SAW chips and / or different BAW chips can be used for different frequency ranges. Such a chip or substrate for different frequency ranges can include piezoelectric layers and / or metallization layers of varying thicknesses.

[0090] Fig. Figure 8B is a schematic cross-sectional side view of a filter assembly 111 with a filter substrate 117 containing various filter components. As shown, the filter assembly 111 includes a first filter component 113 (e.g., SAW component) and a second filter component 115 (e.g., BAW component). One or more acoustic wave filters may include resonators implemented on the first filter component 113 and the second filter component 114. Furthermore, elements of a loop circuit may be implemented on the first filter component 113. The illustrated filter assembly 111 also includes a cap 118 and a cavity 119. The cap 118 may protect the first filter component 113 and / or the second filter component 115. The cap 118 may provide connections and / or shields for the first filter component 113 and the second filter component 114. The cavity 119 may, for example, be an air space.

[0091] The acoustic wave filters, duplexers, and other multiplexers described herein can be implemented in a variety of packaged modules. Several exemplary packaged modules are now discussed, in which all suitable principles and advantages of the acoustic wave filters, duplexers, and / or other multiplexers presented here can be implemented. The exemplary packaged modules can include a housing that encloses the circuit elements shown. The circuit elements shown can be arranged on a common packaging substrate. The packaging substrate can, for example, be a laminate substrate. Fig. 9, Fig. 10 and Fig. Figure 11 are schematic block diagrams of the packaged modules shown, according to specific embodiments. Any suitable combination of features of these modules can be implemented together.

[0092] Fig. Figure 9 is a schematic block diagram of a module 120, which includes the duplexers 101A to 101N and an antenna switch 122. Any number of duplexers 101A to 101N can be used. The antenna switch 122 can have a number of switching positions corresponding to the number of duplexers 101A to 101N. The antenna switch 122 can electrically couple a selected duplexer to an antenna connection of the module 120. The one or more duplexers 101A to 101N can include an acoustic wave filter incorporating two types of resonators according to the suitable principles and advantages described herein. The duplexers 101A to 101N can include one or more SAW chips and one or more BAW chips. The Duplexers 101A to 101N can include a filter chip or substrate that contains one or more BAW resonators and one or more SAW resonators.

[0093] Fig. Figure 10 is a schematic block diagram of a module 130 comprising a power amplifier 132, a high-frequency switch 134, and duplexers 101A to 101N according to one or more embodiments. The power amplifier 132 can amplify a high-frequency signal. The high-frequency switch 134 can be a multi-way high-frequency switch. The high-frequency switch 134 can electrically couple an output of the power amplifier 132 to a selected transmit filter of the duplexers 101A to 101N. Any number of duplexers can be used. One or more of the duplexers 101A to 101N can be used in accordance with the suitable principles and advantages described herein. The duplexers 101A to 101N can include one or more SAW chips and one or more BAW chips. The Duplexers 101A to 101N can include a filter chip or substrate that contains one or more BAW resonators and one or more SAW resonators.

[0094] Fig. Figure 11 is a schematic block diagram of a module 140 comprising a power amplifier 132, a high-frequency switch 134, a duplexer 101 according to one or more embodiments, and an antenna switch 122. The module 140 may include elements of module 120 and elements of module 130.

[0095] Fig.Figure 12 is a schematic block diagram of a wireless communication device 150, which includes filters 153 according to one or more embodiments. The wireless communication device 150 can be any suitable wireless communication device. For example, a wireless communication device 150 can be a mobile phone, such as a smartphone. As shown, the wireless communication device 150 includes an antenna 151, an RF front end 152, an RF transceiver 154, a processor 155, and a memory 156. The antenna 151 can transmit RF signals provided by the RF front end 152. The antenna 151 can provide received RF signals to the RF front end 152 for processing.

[0096] The RF front end 152 can include one or more power amplifiers, one or more low-noise amplifiers, RF switches, receive filters, transmit filters, duplexers or other multiplexers, or any combination thereof. The RF front end 152 can transmit and receive RF signals associated with all suitable communication standards. Each of the acoustic wave filters, duplexers, and / or multiplexers described herein can be implemented by the filters 153 of the RF front end 152.

[0097] The RF transceiver 154 can provide RF signals to the RF front end 152 for amplification and / or other processing. The RF transceiver 154 can also process an RF signal provided by a low-noise amplifier of the RF front end 152. The RF transceiver 154 is connected to the processor 155. The processor 155 can be a baseband processor. The processor 155 can provide all suitable baseband processing functions for the wireless communication device 150. The processor 155 can access the memory 156. The memory 156 can store all suitable data for the wireless communication device 150.

[0098] Some of the embodiments described above have provided examples related to mobile devices such as mobile phones. However, the principles and advantages of the embodiments can be applied to any other system or device, such as any cellular uplink device, that could benefit from any of the embodiments described herein. The teachings contained herein are applicable to a wide variety of systems. Although this disclosure includes some exemplary embodiments, the teachings described herein can be applied to a wide variety of structures. Each of the principles and advantages described herein can be implemented in conjunction with RF circuits configured to process signals in a range of approximately 30 kHz to 300 GHz, for example, in a range of approximately 450 MHz to 6 GHz.

[0099] Aspects of this disclosure can be implemented in various electronic devices. Examples of electronic devices include, but are not limited to, consumer electronics products, components of consumer electronics products such as acoustic wave resonator and / or filter assemblies and / or semiconductor chips and / or packed radio frequency modules, wireless uplink communication devices, wireless communication infrastructure, electronic test equipment, etc.Examples of electronic devices include, but are not limited to, a mobile phone such as a smartphone, a portable computing device such as a smartwatch or earpiece, a telephone, a television, a computer monitor, a computer, a modem, a handheld computer, a laptop, a tablet computer, a personal digital assistant (PDA), a microwave oven, a refrigerator, an automobile, a stereo system, a DVD player, a CD player, a digital music player such as an MP3 player, a radio, a camcorder, a camera, a digital camera, a portable memory chip, a washing machine, a dryer, a washer / dryer, a copier, a fax machine, a scanner, a multifunctional peripheral device, a wristwatch, a clock, etc. Furthermore, electronic devices can also include unfinished products.

Claims

[1] Acoustic wave device comprising: a transmitting filter (11) with a first stage operatively connected to an input of a final stage and comprising acoustic volume wave resonators (S1, S2, S3, S4, P1, P2, P3, P4) but no acoustic surface wave resonators, and with the final stage comprising at least one acoustic series surface wave resonator (RA1, RA2) but no acoustic volume wave resonators, wherein an output of the final stage is coupled to a common node (ANT), wherein the transmitting filter (11) is configured to filter a high-frequency signal, and wherein the at least one acoustic surface wave resonator (RA1, RA2) has a higher suppression of a second harmonic of the high-frequency signal than the acoustic volume wave resonators (S1, S2, S3, S4, P1, P2, P3, P4); a receive filter (12) with an input coupled to the common node (ANT) and a receive filter output node; a first loop circuit (42) comprising a first plurality of acoustic surface wave resonators, coupled to the common node (ANT) and to the input of the transmit filter (11), and configured to generate a first anti-phase signal and apply it to a target signal at the input of the transmit filter (11); and a second loop circuit (43) comprising a second plurality of acoustic surface wave resonators, coupled to the receive filter output node and to the input of the transmit filter (11) and configured to generate a second anti-phase signal and apply it separately from the first anti-phase signal to the target signal at the input of the transmit filter (11). [2] Acoustic wave device according to claim 1, wherein the receiving filter (12) includes a third plurality of acoustic surface wave resonators (RB1, RB2, RB3, RB4, RB5, RB6, RB7, RB8, RB9, RBA). [3] Acoustic wave device according to claim 2, wherein the transmit filter (11) and the receive filter (12) are contained in a duplexer (10). [4] Acoustic wave device according to claim 2, wherein the second loop circuit (43) comprises acoustic surface wave resonators. [5] Acoustic wave device according to claim 2, wherein the acoustic series surface wave resonator (RA1, RA2) is implemented in the final stage of the transmit filter (11) and at least one of the third plurality of acoustic surface wave resonators (RB1, RB2, RB3, RB4, RB5, RB6, RB7, RB8, RB9, RBA) are implemented in the receive filter (12) on a common substrate (116). [6] Acoustic wave device according to claim 5, wherein the first loop circuit (42) includes a further acoustic surface wave element implemented on the common substrate (116). [7] Acoustic wave device according to claim 1, further comprising a receiving filter (12) designed to output an asymmetrical high-frequency signal. [8] Acoustic wave device according to claim 1, wherein the final stage further comprises at least one acoustic shunt surface wave resonator. [9] Acoustic wave device according to claim 1, wherein the acoustic series surface wave resonator (RA1, RA2) of the final stage improves antenna matching to the first stage. [10] Acoustic wave device according to claim 8, wherein the acoustic series surface wave resonator (RA1, RA2) and the acoustic shunt surface wave resonator of the final stage each have their own interdigital transducer electrode and do not share a bus rail. [11] Method for processing a high-frequency signal, comprising: Filtering a high-frequency signal by a transmitting filter (11) with a first stage operatively connected to an input of a final stage and comprising acoustic volume wave resonators (S1, S2, S3, S4, P1, P2, P3, P4), but no acoustic surface wave resonators, and with the final stage comprising at least one acoustic series surface wave resonator (RA1, RA2), but no acoustic volume wave resonators, in which an output of the final stage is coupled to a common node, wherein the at least one acoustic surface wave resonator (RA1, RA2) has a higher suppression of a second harmonic of the high-frequency signal than the acoustic volume wave resonators (S1, S2, S3, S4, P1, P2, P3, P4); Filtering a received high-frequency signal by a receive filter (12) with an input coupled to the common node and a receive filter output node; Suppression of a target signal by applying a first anti-phase signal to the target signal at the input of the transmitting filter (11) by means of a first loop circuit comprising a first plurality of acoustic surface wave resonators, which is coupled to the common node and to the input of the transmitting filter (11); and Suppression of the target signal by applying a second anti-phase signal to the target signal separately from the first anti-phase signal at the input of the transmit filter (11) by means of a second loop circuit comprising a second plurality of acoustic surface wave resonators, which is coupled to the receive filter output node and to the input of the transmit filter (11). [12] Method according to claim 11, wherein a filtering of a second high-frequency signal is carried out by the receiving filter (12) with acoustic surface wave resonators. [13] Method according to claim 12, wherein the transmit filter (11) and the receive filter (12) are contained in a duplexer (10). [14] Method according to claim 13, wherein the acoustic series surface wave resonator (RA1, RA2) and at least one of the acoustic surface wave resonators are arranged on a common substrate (116). [15] Method according to claim 13, wherein the receiving filter (12) is designed to output an asymmetrical high-frequency signal. [16] Method according to claim 11, wherein the first loop circuit includes an acoustic surface wave element implemented on the same substrate as the acoustic series surface wave resonator (RA1, RA2). [17] Method according to claim 11, wherein the final stage further comprises at least one acoustic shunt surface wave resonator. [18] Method according to claim 17, wherein the acoustic series surface wave resonator (RA1, RA2) and the acoustic shunt surface wave resonator of the final stage each have their own interdigital converter electrode and do not share a bus rail. [19] Method according to claim 17, wherein the final stage comprises a plurality of acoustic shunt surface wave resonators. [20] Method according to claim 11, wherein the acoustic series surface wave resonator (RA1, RA2) of the final stage improves antenna matching to the first stage. [21] Filter arrangement (110), comprising: a first filter coupled to a common node and designed to output an asymmetrical high-frequency signal; and a second filter coupled to the common node and designed to filter a high-frequency signal, comprising acoustic wave resonators of a first type and an acoustic series wave resonator of a second type coupled between the acoustic wave resonators of the first type and the common node, and exhibiting a higher suppression of a second harmonic of a high-frequency signal than the acoustic wave resonators of the first type. [22] Filter arrangement (110) according to claim 21, wherein the acoustic wave resonators of the first type are acoustic volume wave resonators (S1, S2, S3, S4, P1, P2, P3, P4) and the acoustic series wave resonator of the second type is an acoustic surface wave resonator (RA1, RA2). [23] Filter arrangement (110) according to claim 22, wherein the acoustic volume wave resonators are (S1, S2, S3, S4, P1, P2, P3, P4) and the acoustic surface wave resonator is applied to a common filter substrate (117) and enclosed in a common cap (118). [24] Filter arrangement (110) according to claim 21, wherein the filter arrangement (110) comprises a first substrate comprising the acoustic wave resonators of the first type and a second substrate comprising the acoustic series wave resonator of the second type. [25] Filter arrangement (110) according to claim 21, wherein the second filter comprises acoustic wave resonators of the first type arranged as conductor filters. [26] Filter arrangement (110) according to claim 21, further comprising a loop circuit (42) coupled to the second filter and designed to generate an anti-phase signal for a target signal at a specific frequency. [27] Filter arrangement (110) according to claim 26, wherein the loop circuit (42) includes acoustic surface wave elements implemented on the same substrate as the acoustic wave resonators of the second type. [28] Filter arrangement (110) according to claim 26, wherein the first filter is a receive filter (12), the second filter is a transmit filter (11) and the first filter and the second filter are contained in a duplexer (10). [29] Filter arrangement (110) according to claim 21, wherein a combination of the acoustic wave resonators of the first type and the acoustic series wave resonator of the second type reduces a second order distortion caused by the asymmetry between the first and second filters. [30] Filter arrangement (110) according to claim 21, wherein a combination of the acoustic wave resonators of the first type and the acoustic series wave resonator of the second type reduces a second order distortion caused by the acoustic wave resonators of the first type. [31] Filter arrangement (110) according to claim 21, wherein a combination of the acoustic wave resonators of the first type and the acoustic series wave resonator of the second type improves antenna matching. [32] Filter arrangement (110) according to claim 21, wherein the first filter coupled to the first common node comprises a plurality of acoustic wave resonators of the second type, and the acoustic wave resonators of the second type in the first filter and the acoustic series wave resonator of the second type in the second filter are arranged in the same chip to improve antenna matching. [33] Filter arrangement (110) according to claim 21, wherein a first stage of the second filter comprises the acoustic wave resonators of the first type and a final stage of the second filter coupled to the first common node comprises the acoustic series wave resonator of the second type. [34] Filter arrangement (110) according to claim 21, wherein a first stage of the second filter comprises the acoustic wave resonators of the first type and a final stage of the second filter coupled to the first common node comprises the acoustic series wave resonator of the second type, but no acoustic wave resonators of the first type. [35] Filter arrangement (110) according to claim 34, wherein the final stage of the second filter further comprises an acoustic shunt wave resonator of the second type coupled between the first stage and the acoustic series wave resonator of the second type. [36] Filter arrangement (110) according to claim 35, wherein the acoustic series wave resonator of the second type and the acoustic shunt wave resonator of the second type each have their own interdigital transducer electrode. [37] Filter arrangement (110) according to claim 34, wherein the first filter coupled to the first common node comprises acoustic wave resonators of the second type arranged as a first conductor filter, and a first stage of the second filter comprises the acoustic wave resonators of the first type arranged as a second conductor filter. [38] Filter arrangement (110) according to claim 34, further comprising at least one loop circuit which is coupled to the first common node. [39] Filter arrangement (110) according to claim 21, further comprising: a third filter that is selectively coupled to a second common node and is designed to output an asymmetrical high-frequency output signal; a fourth filter coupled to the second common node and designed to filter a high-frequency signal, comprising acoustic wave resonators of the first type and an acoustic series wave resonator of the second type coupled between the acoustic wave resonators of the first type and the second common node, and exhibiting a higher second harmonic suppression of a high-frequency signal than the acoustic wave resonators of the first type; and at least one first switch that toggles between the first and second common nodes and an antenna. [40] Filter arrangement (110) according to claim 39, further comprising at least a second switch which is arranged between a power amplifier and the first stage of the second filter. [41] Filter arrangement (110), comprising: a transmitting filter (11) having a common node-coupled output and comprising a first stage connected in series with at least one second stage, the first stage comprising a first plurality of acoustic wave resonators of a first type and the second stage comprising a second plurality of acoustic wave resonators of a second type, but not of the first type, wherein the second plurality of acoustic wave resonators exhibits a higher suppression of a second harmonic of a high-frequency signal than the first plurality of acoustic wave resonators of the first type; and a receiving filter (12) having an input coupled to the common node and designed to provide an asymmetrical high-frequency output signal. [42] Filter arrangement (110) according to claim 41, wherein the first plurality of acoustic wave resonators of the first type are acoustic volume wave resonators (S1, S2, S3, S4, P1, P2, P3, P4) and the second plurality of acoustic wave resonators of the second type are acoustic surface wave resonators. [43] Filter arrangement (110) according to claim 42, wherein the acoustic volume wave resonators are (S1, S2, S3, S4, P1, P2, P3, P4) and the acoustic surface wave resonators are implemented on a common filter substrate (117). [44] Filter arrangement (110) according to claim 41, wherein the filter arrangement (110) comprises a first substrate comprising the first plurality of acoustic wave resonators of the first type and a second substrate comprising the second plurality of acoustic wave resonators of the second type. [45] Filter arrangement (110) according to claim 41, further comprising a loop circuit coupled to the output of the receive filter (12) and the input of the transmit filter (11) and designed to generate an anti-phase signal for a target signal at a specific frequency. [46] Filter arrangement (110) according to claim 45, wherein the loop circuit includes acoustic surface wave elements implemented on the same substrate as the second plurality of acoustic wave resonators of the second type. [47] Filter arrangement (110) according to claim 41, wherein the transmit filter (11) and the receive filter (12) are arranged in a duplexer (10). [48] ​​Filter arrangement (110) according to claim 41, further comprising a loop circuit coupled to the common node, the output of the receive filter (12) and an input of the transmit filter (11) and designed to generate an anti-phase signal for a target signal at a specific frequency. [49] Filter arrangement (110) according to claim 41, further comprising a loop circuit coupled to the common node and the output of the receive filter (12) and designed to generate an anti-phase signal for a target signal at a specific frequency. [50] Filter arrangement (110) according to claim 41, wherein a combination of the first plurality of acoustic wave resonators of the first type and the second plurality of acoustic wave resonators of the second type improves antenna matching. [51] Method for processing a high-frequency signal, comprising: Generating a filtered high-frequency transmit signal with a transmit filter (11) comprising a first stage connected in series with at least one second stage, the first stage having a first plurality of acoustic wave resonators of a first type and the second stage having a second plurality of acoustic wave resonators of a second type, but not of the first type, wherein the second plurality of acoustic wave resonators has a higher suppression of a second harmonic of a high-frequency signal than the first plurality of acoustic wave resonators of the first type; Output of the filtered high-frequency transmit signal to a common node (common code); and Filtering a high-frequency received signal with a receive filter (12) coupled to the common node to provide an asymmetrical high-frequency output signal. [52] Method according to claim 51, wherein the first plurality of acoustic wave resonators of the first type are acoustic volume wave resonators (S1, S2, S3, S4, P1, P2, P3, P4) and the second plurality of acoustic wave resonators of the second type are acoustic surface wave resonators. [53] Method according to claim 52, further comprising implementing the acoustic volume wave resonators (S1, S2, S3, S4, P1, P2, P3, P4) and the acoustic surface wave resonators on a common filter substrate (117). [54] Method according to claim 51, further comprising implementing the first plurality of acoustic wave resonators of the first type on a first substrate and implementing the second plurality of acoustic wave resonators of the second type on a second substrate. [55] Method according to claim 51, further comprising coupling a loop circuit with the output of the receive filter (12) and an input of the transmit filter (11) and generating an anti-phase signal for a target signal at a specific frequency with the loop circuit. [56] Method according to claim 55, further comprising implementing acoustic surface wave elements in the loop circuit on the same substrate as the second plurality of acoustic wave resonators of the second type. [57] Method according to claim 51, further comprising implementing the transmit filter (11) and the receive filter (12) in a duplexer (10). [58] Method according to claim 51, further comprising coupling a loop circuit with the common node, the output of the receive filter (12) and an input of the transmit filter (11) and generating an anti-phase signal for a target signal at a specific frequency with the loop circuit. [59] Method according to claim 51, further comprising coupling a loop circuit with the common node and the output of the receive filter (12) and generating an anti-phase signal for a target signal at a specific frequency with the loop circuit [60] Method according to claim 51, further comprising improving the antenna matching with a combination of the first plurality of acoustic wave resonators of the first type and the second plurality of acoustic wave resonators of the second type.

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