A surface acoustic wave device

Abstract

This invention discloses a surface acoustic wave (SAW) device, comprising a first region and a second region. The SAW device further includes: at least one first bridging trace; at least one first filter located in the first region; a first grounding network corresponding to each of the first filters, with each first grounding network located in the first region; a second filter located in the second region and corresponding to each of the first filters; a second grounding network corresponding to each of the second filters, with each second grounding network located in the second region; the first filters are electrically connected to the first grounding networks; the second filters are electrically connected to the second grounding networks; the first bridging trace spans the first and second regions, with one end of the first bridging trace in the first region electrically connected to the first grounding network and the other end in the second region electrically connected to the second grounding network. This invention effectively improves the suppression and isolation of the SAW device and enhances its overall performance.

Description

Technical Field

[0001] This invention relates to the field of communication equipment technology, and in particular to a surface acoustic wave device. Background Technology

[0002] With the continuous advancement of wireless communication technology, especially the development of 5G NR technology, more and more wireless frequency bands are being used. Selecting different frequency bands and reducing interference between them will become increasingly complex, thus posing greater challenges to radio frequency (RF) front-end devices. Filters, as crucial components of the RF front-end, enable the selection of wireless signals from specific frequency bands, playing a vital role in mobile communications, the Internet of Things (IoT), and VR / AR applications. Duplexers or multiplexers, composed of multiple transmit and receive filters, can achieve synchronous transmission and reception in FDD-coded mode, and will have broader application prospects and stronger market competitiveness in the complex wireless spectrum environment of the future.

[0003] With the continuous evolution of RF front-end integration technology, there will be higher requirements for the miniaturization design of devices. In the entire RF link, the multiplexer mainly serves as the first or last stage of the transmitting carrier. Reducing the insertion loss of the filter will have a direct impact on the sensitivity and signal-to-noise ratio of the receiving system. Improving the suppression of the transmitting end on the receiving end can greatly improve the anti-interference capability and enhance the communication quality.

[0004] Currently, most methods to improve the suppression of multiplexers involve shifting the zero point of the resonator by loading an inductor onto the substrate, thereby enhancing its suppression. However, due to the low Q value of the inductor, this can have a fatal effect on the passband of the multiplexer, affecting the overall insertion loss. Another approach is to connect a phase shifter in parallel at the transmitter and receiver to cancel the signals transmitted from the transmitter to the receiver, thus achieving high isolation at the receiver. However, this method is not easily miniaturized. A small number of methods use a loaded suppression resonator, which can only improve isolation in a very narrow frequency band. Furthermore, due to bulk wave limitations, the resonator can only be shifted from low to high frequencies, and the suppression of low frequencies is relatively weakened. Summary of the Invention

[0005] This invention provides a surface acoustic wave (SAW) device that can improve the suppression of filters while satisfying the miniaturization requirements of SAW devices.

[0006] According to one aspect of the present invention, a surface acoustic wave device is provided, comprising: a first region and a second region;

[0007] The surface acoustic wave device further includes:

[0008] At least one first jumper cable;

[0009] At least one first filter located in the first region;

[0010] A first grounding network is provided in a one-to-one correspondence with the first filter, and each of the first grounding networks is located in the first region;

[0011] A second filter located in the second region and configured in a one-to-one correspondence with the first filter;

[0012] A second grounding network is set up in a one-to-one correspondence with the second filter, and each of the second grounding networks is located in the second region;

[0013] The first filter is electrically connected to the first grounding network; the second filter is electrically connected to the second grounding network;

[0014] The first bridging trace spans the first region and the second region, and one end of the first bridging trace in the first region is electrically connected to the first grounding network, and the other end in the second region is electrically connected to the second grounding network.

[0015] Optionally, the first region includes at least two first filters and at least two first grounding networks configured in a one-to-one correspondence with each of the first filters, and the second region includes at least two second filters and at least two second grounding networks configured in a one-to-one correspondence with each of the second filters;

[0016] The first filter and the second filter, which are electrically connected to the same first jumper trace, are respectively a transmitting filter and a receiving filter.

[0017] Optionally, the first region includes at least two first filters and at least two first grounding networks configured in a one-to-one correspondence with each of the first filters, and the second region includes at least two second filters and at least two second grounding traces configured in a one-to-one correspondence with each of the second filters;

[0018] Both the first filter and the second filter, which are electrically connected to the same first jumper trace, are transmitting filters.

[0019] Optionally, the first region includes at least two first filters and at least two first grounding networks configured in a one-to-one correspondence with each of the first filters, and the second region includes at least two second filters and at least two second grounding networks configured in a one-to-one correspondence with each of the second filters;

[0020] Both the first filter and the second filter, which are electrically connected to the same first jumper trace, are receiving filters.

[0021] Optionally, the first filter includes at least a first series resonator, a second series resonator, a third series resonator, a fourth series resonator, a first parallel resonator, a second parallel resonator, a third parallel resonator, and a fourth parallel resonator.

[0022] Each of the series resonators has a first connection trace at both ends. The first series resonator, the second series resonator, the third series resonator, and the fourth series resonator are connected in series between the input and output terminals of the first filter through each of the first connection traces.

[0023] The first end of the first parallel resonator is electrically connected to the first connection trace between the first series resonator and the second series resonator; the first end of the second parallel resonator is electrically connected to the first connection trace between the second series resonator and the third series resonator; the first end of the third parallel resonator is electrically connected to the first connection trace between the third series resonator and the fourth series resonator; and the first end of the fourth parallel resonator is electrically connected to the first connection trace on the side of the fourth series resonator away from the third series resonator.

[0024] The second ends of the first parallel resonator, the second parallel resonator, the third parallel resonator, and the fourth parallel resonator are all electrically connected to the first grounding network.

[0025] Optionally, the second filter includes at least a fifth series resonator, a sixth series resonator, a seventh series resonator, an eighth series resonator, a fifth parallel resonator, a sixth parallel resonator, and a seventh parallel resonator.

[0026] Each of the series resonators in the second filter has a second connection trace at both ends. The fifth, sixth, and seventh series resonators are connected in series between the input and output terminals of the second filter through each of the second connection traces.

[0027] The first end of the fifth parallel resonator is electrically connected to the second connection trace between the fifth series resonator and the sixth series resonator; the first end of the sixth parallel resonator is electrically connected to the second connection trace between the sixth series resonator and the seventh series resonator; and the first end of the seventh parallel resonator is electrically connected to the second connection trace between the seventh series resonator and the eighth series resonator.

[0028] The second end of the fifth parallel resonator, the second end of the sixth parallel resonator, and the second end of the seventh parallel resonator are all electrically connected to the second grounding network.

[0029] Optionally, the first bridging trace crosses one of the first connection traces, and the first bridging trace is isolated from the first connection trace it crosses by a bridging bridge.

[0030] And / or, the first bridging trace crosses one of the second connection traces, and the first bridging trace is isolated from the cross-connecting second connection trace by a bridging bridge.

[0031] Optionally, the second filter includes at least: a ninth series resonator, a tenth series resonator, an eleventh series resonator, a DMS resonator, an eighth parallel resonator, and a ninth parallel resonator;

[0032] The ninth series resonator, the DMS resonator, the tenth series resonator, and the eleventh series resonator are all provided with third connection traces at both ends; the ninth series resonator, the DMS resonator, the tenth series resonator, and the eleventh series resonator are connected in series between the receiving end and the transmitting end of the second filter through the third connection traces.

[0033] The first end of the eighth parallel resonator is electrically connected to the third connection trace between the ninth series resonator and the DMS resonator; the first end of the ninth parallel resonator is electrically connected to the third connection trace between the tenth series resonator and the eleventh series resonator.

[0034] The second end of the DMS resonator, the second end of the eighth parallel resonator, and the second end of the ninth parallel resonator are all electrically connected to the second grounding network.

[0035] Optionally, the second filter is a receiving filter.

[0036] The surface acoustic wave (SAW) device provided in this embodiment of the invention connects two filters in the SAW device to a common ground by bridging them with a first bridging trace. This can effectively improve the suppression and isolation of the SAW device, thereby effectively improving the signal suppression performance and overall performance of the SAW device, and can also meet the miniaturization design requirements of the SAW device.

[0037] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the circuit structure of a surface acoustic wave device provided in an embodiment of the present invention;

[0040] Figure 2 Is with Figure 1 The circuit layout of a corresponding surface acoustic wave device;

[0041] Figure 3 This is a schematic diagram of the circuit structure of another surface acoustic wave device provided in an embodiment of the present invention;

[0042] Figure 4 Is with Figure 3 The circuit layout of a corresponding surface acoustic wave device;

[0043] Figure 5 This is a schematic diagram of the circuit structure of another surface acoustic wave device provided in an embodiment of the present invention;

[0044] Figure 6 Is with Figure 5 The circuit layout of a corresponding surface acoustic wave device;

[0045] Figure 7 This is a schematic diagram of a bridging structure for a surface acoustic wave device provided in an embodiment of the present invention;

[0046] Figure 8 This is a schematic diagram of the circuit structure of another surface acoustic wave device provided in an embodiment of the present invention;

[0047] Figure 9 Is with Figure 8 The circuit layout of a corresponding surface acoustic wave device;

[0048] Figure 10 yes Figure 2 The diagram shows a performance comparison between surface acoustic wave devices and existing technologies.

[0049] Figure 11 yes Figure 4 The diagram shows a performance comparison between surface acoustic wave devices and existing technologies. Detailed Implementation

[0050] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0051] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0052] Figure 1 This is a schematic diagram of the circuit structure of a surface acoustic wave device provided in an embodiment of the present invention. Figure 2 Is with Figure 1 A corresponding circuit layout for a surface acoustic wave device, in conjunction with a reference. Figure 1 and Figure 2 The surface acoustic wave (SAW) device 00 includes: a circuit layout of a first region A1 and a second region A2; the SAW device 00 further includes: at least one first bridging trace B1; at least one first filter 10 located in the first region A1; a first grounding network G1 corresponding to each of the first filters 10, and each first grounding network G1 is located in the first region A1; a second filter 20 located in the second region A2 and corresponding to each of the first filters 10; a second grounding trace G2 corresponding to each of the second filters 20, and each second grounding trace G2 is located in the second region A2; the first filter 10 is electrically connected to the first grounding network G1; the second filter 20 is electrically connected to the second grounding network G2; the first bridging trace B1 spans the first region A1 and the second region A2, and one end of the first bridging trace B1 in the first region A1 is electrically connected to the first grounding network G1, and one end of the first bridging trace B1 in the second region A2 is electrically connected to the second grounding network G2.

[0053] Specifically, Figure 1 and Figure 2An illustrative example is shown where a first region A1 includes a first filter 10 and a corresponding second region A2 includes a second filter 20. In this case, one filter is a transmitting filter TX and the other is a receiving filter RX, meaning the surface acoustic wave device 00 is a duplexer. For example, the first filter 10 can be configured as the transmitting filter TX and the second filter 20 as the receiving filter RX. In this case, the input terminal of the first filter 10 is the signal input terminal RIN of the surface acoustic wave device 00, and the output terminal of the first filter 10 is the antenna terminal ANT. The surface acoustic wave device 00 can transmit radio frequency signals from the antenna terminal ANT. The receiving terminal of the second filter 20 is the antenna terminal ANT, and the output terminal of the second filter 20 is the output terminal ROT of the surface acoustic wave device 00. It can receive external radio frequency signals from the antenna terminal ANT and transmit these signals to the signal output terminal ROT of the surface acoustic wave device 00. The second filter 20 also includes a ground terminal, wherein the first filter 10 is electrically connected to the first grounding network G1 within its region; specifically, the ground terminal of the first filter 10 is electrically connected to the first grounding network G1. Similarly, the second filter 20 is electrically connected to the second grounding trace G2 within its area; specifically, the grounding terminal of the second filter 20 can be considered as being electrically connected to the second grounding network G1. Both the first grounding network G1 and the second grounding network G2 are electrically connected to the external grounding terminal GND.

[0054] The first bridging trace B1 can be configured in a one-to-one correspondence with the first filter 10. In some feasible embodiments, the number of first bridging traces B1 can be less than the number of first filters 10, and this embodiment of the present invention does not specifically limit this. The first bridging trace B1 can span the first region A1 and the second region A2, so that one end of it located in the first region A1 is electrically connected to the first grounding network G1, and the other end located in the second region A2 is electrically connected to the second grounding network G1. Thus, the first grounding network G1 and the second grounding network G1 located in the two regions are electrically connected through the first bridging trace B1, realizing the common ground connection between the first filter 10 and the second filter 20. Tests show that the common ground connection between the first filter 10 and the second filter 20 can effectively improve the noise signal suppression of the surface acoustic wave device 00, and can also improve the isolation of the surface acoustic wave device 00, thereby improving the signal suppression performance of the surface acoustic wave device 00.

[0055] The surface acoustic wave (SAW) device provided in this embodiment of the invention connects two filters in the SAW device to a common ground by bridging them with a first bridging trace. This can effectively improve the suppression and isolation of the SAW device, thereby effectively improving the signal suppression performance and overall performance of the SAW device, and can also meet the miniaturization design requirements of the SAW device.

[0056] For example, when the surface acoustic wave device is a multiplexer, the first grounding network G1 and the second grounding network G2 can be electrically connected. The types of each first filter 10 can be the same, i.e., all can be transmitting filters TX, in which case each second filter 20 corresponds to a receiving filter. Alternatively, the types of each first filter 10 can be different, i.e., each first filter 10 can have a transmitting filter TX and a receiving filter RX, in which case each second filter 20 also has a corresponding transmitting filter TX and a receiving filter RX. In the first region A1 and the second region A2, the number of transmitting filters TX is the same as the number of receiving filters RX, so that one transmitting filter TX and one receiving filter RX form a group, and each frequency band can be configured to have a corresponding group of transmitting filters TX and receiving filters RX.

[0057] Optional, Figure 3 This is a schematic diagram of the circuit structure of another surface acoustic wave device provided in an embodiment of the present invention. Figure 4 Is with Figure 3 A corresponding circuit layout for a surface acoustic wave device, in conjunction with a reference. Figure 3 and Figure 4 The first region A1 includes at least two first filters 10 and at least two first grounding networks G1 that are configured one-to-one with each of the first filters 10. The second region A2 includes at least two second filters 20 and at least two second grounding networks G2 that are configured one-to-one with each of the second filters 20. The first filter 10 and the second filter 20 that are electrically connected to the same first bridging line B1 are respectively the transmitting filter Tx and the receiving filter RX.

[0058] Specifically, since the first grounding network G1 is configured one-to-one with the first filter 10 and is electrically connected to the corresponding first filter 10, and the second grounding network G2 is configured one-to-one with the second filter 20 and is electrically connected to the corresponding second filter 20, the first bridging trace B1 being electrically connected to the first grounding trace G1 is equivalent to the first bridging trace B1 being electrically connected to the first filter 10 corresponding to the first grounding network G1. Similarly, the first bridging trace B1 being electrically connected to the second grounding trace G2 is equivalent to the first bridging trace B1 being electrically connected to the second filter 20 corresponding to the second grounding network G2. When the surface acoustic wave device 00 is a multiplexer, the first filter 10 and the second filter 20 electrically connected to the same first bridging trace B1 can be the transmitting filter TX and the receiving filter RX, respectively. In this way, the noise suppression degree of the surface acoustic wave device 00 can also be improved, and the isolation degree of the surface acoustic wave device 00 can be improved. The first filter 10 and the second filter 20, which are electrically connected to the same first bridging trace B1, can be a transmitting filter TX and a receiving filter RX in the same frequency band, or they can be transmitting filters TX and receiving filters RX in different frequency bands. This embodiment of the invention does not specifically limit their applications. It should be noted that... Figure 4 The example shown only illustrates a surface acoustic wave device 00 including two first bridging traces B1, and two first grounding networks G1 respectively electrically connected to the corresponding second grounding network G2 through one first bridging trace B1. It can be understood that when the surface acoustic wave device 00 is a multiplexer, it may also include only one first bridging trace B1. In this case, a set of first grounding traces G1 and second grounding traces G2 can be electrically connected through the first bridging trace B1. The embodiments of the present invention do not specifically limit this.

[0059] Optional, Figure 5 This is a schematic diagram of the circuit structure of another surface acoustic wave device provided in an embodiment of the present invention. Figure 6 Is with Figure 5 A corresponding circuit layout for a surface acoustic wave device, in conjunction with a reference. Figure 5 and Figure 6 The first region A1 includes at least two first filters 10 and at least two first grounding networks G1 that are configured one-to-one with each of the first filters 10. The second region A2 includes at least two second filters 20 and at least two second grounding networks G2 that are configured one-to-one with each of the second filters 20. The first filters 10 and the second filters 20 that are electrically connected to the same first bridging line B1 are both transmitting filters TX.

[0060] Specifically, when the surface acoustic wave device 00 is a multiplexer, the first filter 10 and the second filter 20, which are electrically connected to the same first bridging trace B1, can also both be transmitting filters TX, which can also improve the noise suppression degree of the surface acoustic wave device 00 and improve the isolation degree of the surface acoustic wave device 00.

[0061] Optional, see reference Figure 4 The first region A1 includes at least two first filters 10 and at least two first grounding traces G1 corresponding to each first filter 10. The second region A2 includes at least two second filters 20 and at least two second grounding traces G2 corresponding to each second filter 20. Both the first and second filters electrically connected to the same first bridging trace are receiving filters. Specifically, when the surface acoustic wave device 00 is a multiplexer, the first filter 10 and the second filter 20 electrically connected to the same first bridging trace B1 can also both be receiving filters TX, which can similarly improve the noise suppression and isolation of the surface acoustic wave device 00.

[0062] Optional, see reference Figure 2 The first filter 10 includes at least a first series resonator S1, a second series resonator S2, a third series resonator S3, a fourth series resonator S4, a first parallel resonator P1, a second parallel resonator P2, a third parallel resonator P3, and a fourth parallel resonator P4. Each series resonator (i.e., S1, S2, S3, and S4) has a first connecting trace C1 at both ends. The first series resonator S1, the second series resonator S2, the third series resonator S3, and the fourth series resonator S4 are connected in series between the receiving end and the transmitting end of the first filter 10 through each first connecting trace C1. The first end of the first parallel resonator P1 is electrically connected to the first series resonator S1 and the second series resonator S4. The first connection trace C1 between the parallel resonators S2, the first end of the second parallel resonator P2 is electrically connected to the first connection trace C1 between the second series resonator S2 and the third series resonator S3, the first end of the third parallel resonator P3 is electrically connected to the first connection trace C1 between the third series resonator S3 and the fourth series resonator S4, and the first end of the fourth parallel resonator P4 is electrically connected to the first connection trace C1 on the side of the fourth series resonator S4 away from the third series resonator S3; the second ends of the first parallel resonator P1, the second end of the second parallel resonator P2, the second end of the third parallel resonator P3 and the second end of the fourth parallel resonator P4 are all electrically connected to the first grounding network G1.

[0063] Specifically, the first filter 10 can be a trapezoidal structure, wherein the first series resonator S1, the second series resonator S2, the third series resonator S3, and the fourth series resonator S4 are connected in series between the input and output terminals of the first filter 10. Furthermore, the first connection trace C1 between the first series resonator S1 and the second series resonator S2 is electrically connected to the first grounding network G1 through the first parallel resonator P1; the first connection trace C1 between the second series resonator S2 and the third series resonator S3 is electrically connected to the first grounding network G1 through the second parallel resonator P2; and the first connection trace C1 between the third series resonator S3 and the fourth series resonator S4 is electrically connected to the first grounding network G1 through the third parallel resonator P3. The first grounding network G1 can be electrically connected to a second grounding network G2 in the second region A2 through the first bridging trace B1.

[0064] For example, it is preferable to set the grounding network connected to the parallel resonator in the middle to be electrically connected to the first bridging trace B1. In this way, the first bridging trace B1 can cross the first connecting trace C1 located in the middle position. Tests have shown that the surface acoustic wave device 00 has the best isolation effect when the above-mentioned trace setting is adopted.

[0065] Optional, continue to refer to Figure 2 The second filter 20 includes at least a fifth series resonator S5, a sixth series resonator S6, a seventh series resonator S7, an eighth series resonator S8, a fifth parallel resonator P5, a sixth parallel resonator P6, and a seventh parallel resonator P7. Each series resonator (S5, S6, S7, and S8) of the second filter 20 has a second connection trace C2 at both ends. The fifth series resonator S5, the sixth series resonator S6, the seventh series resonator S7, and the eighth series resonator S8 are connected in series between the input and output terminals of the second filter 20 through each of the second connection traces C2. The first end of the fifth parallel resonator P5 is electrically connected to the second connection line C2 between the fifth series resonator S5 and the sixth series resonator S6. The first end of the sixth parallel resonator P6 is electrically connected to the second connection line C2 between the sixth series resonator S6 and the seventh series resonator S7. The first end of the seventh parallel resonator P7 is electrically connected to the second connection line C2 between the seventh series resonator S7 and the eighth series resonator S8. The second ends of the fifth parallel resonator P5, the sixth parallel resonator P6, and the seventh parallel resonator P7 are all electrically connected to the second grounding network G2.

[0066] Specifically, the second filter 20 can also be a trapezoidal structure, wherein the fifth series resonator S5, the sixth series resonator S6, the seventh series resonator S7, and the eighth series resonator S8 are connected in series between the input and output terminals of the second filter 20. Furthermore, the second connection trace C2 between the fifth series resonator S5 and the sixth series resonator S6 is electrically connected to the second grounding network G2 through the fifth parallel resonator P5, and the second connection trace C2 between the sixth series resonator S6 and the seventh series resonator S7 is electrically connected to the second grounding network G2 through the sixth parallel resonator P6. The second grounding network G2 can be electrically connected to a first grounding network G1 in the first region A1 through the first bridging trace B1.

[0067] Optional, continue to refer to Figure 2 The first crossover route B1 crosses one of the first connecting routes C1, and the first crossover route B1 is isolated from the crossover first connecting route C1 by a crossover bridge; and / or, the first crossover route B1 crosses one of the second connecting routes C2, and the first crossover route B1 is isolated from the crossover second connecting route C2 by a crossover bridge.

[0068] Specifically, Figure 7 This is a schematic diagram of the bridging layer structure of a surface acoustic wave device provided in an embodiment of the present invention, in conjunction with reference to the reference. Figure 2 and Figure 7 As shown, at least a first filter 10 can be formed on wafer L1 first. Figure 7 (not shown in the image), second filter 20 ( Figure 7 The filter circuit layer L2 (not shown) of the first ground network G1 and the second ground network G2 is formed. Then, an insulating layer L3 is formed on the side of the filter circuit layer away from the wafer. The insulating layer is then patterned so that the insulating layer L3 at least covers each of the first connection traces C1. Then, a bridging trace layer is formed on the side of the insulating layer C1 away from the wafer. The bridging layer is patterned to form a first bridging trace B1, so that the first bridging trace B1 can not only connect the first ground network G1 and the second ground network G2, but also cross one of the first connection traces C1 in the first filter and one of the second connection traces C2 in the second filter. In this way, the isolation of the surface acoustic wave device 00 can be further improved.

[0069] In other feasible embodiments of the present invention, the first bridging trace B1 may be configured to cross only one first connecting trace C1, or only one second connecting trace C2. The embodiments of the present invention do not specifically limit this.

[0070] For example, it is preferable to configure the first grounding network G1 connected to the middle parallel resonator in the first filter 10 to be electrically connected to the first bridging trace B1, so that the first bridging trace B1 can cross the first connecting trace C1 located in the middle position, for example. Figure 2 In the second filter 20, the first grounding network G1 between the second parallel resonator P2 and the third parallel resonator P3 is electrically connected to the first bridging trace B1. This first grounding network G1 is then connected to the first connecting trace C1 between the second series resonator S2 and the third series resonator S3. Similarly, it is preferable to connect the second grounding network G2, which is connected to the middle parallel resonator in the second filter 20, to the first bridging trace B1. In this way, the first bridging trace B1 can cross the second connecting trace C2 located in the middle position. Tests show that the surface acoustic wave device 00 achieves the best isolation effect when the above wiring configuration is used.

[0071] Optional, refer to the reference Figure 5 and Figure 6 The second filter 20 includes at least: a ninth series resonator S9, a tenth series resonator S10, an eleventh series resonator S11, a DMS resonator 21, an eighth parallel resonator P8, and a ninth parallel resonator P9; both ends of the ninth series resonator S9, the DMS resonator 21, the tenth series resonator S10, and the eleventh series resonator S11 are provided with a third connecting trace C3; the ninth series resonator S9, the DMS resonator 21, the tenth series resonator S10, and the eleventh series resonator S11 are connected by a third connecting trace C3. The connecting trace C3 is connected in series between the receiving end and the transmitting end of the second filter 20; the first end of the eighth parallel resonator P8 is electrically connected to the third connecting trace C3 between the ninth series resonator S9 and the DMS resonator 21; the first end of the ninth parallel resonator P9 is electrically connected to the third connecting trace C3 between the tenth series resonator S10 and the eleventh series resonator S11; the second ends of the DMS resonator 21, the eighth parallel resonator P8, and the ninth parallel resonator P9 are all electrically connected to the second grounding network G2.

[0072] Specifically, the second filter 20 may include a filter with a DMS structure. Figure 5 and Figure 6 This illustration only demonstrates one DMS structure filter. In other feasible embodiments of the present invention, the DMS structure filter can take other forms, and the embodiments of the present invention do not specifically limit these forms. Specifically, the ninth series resonator S9, the DMS resonator 21, the tenth series resonator S10, and the eleventh series resonator S11 are connected in series between the receiving end and the transmitting end of the second filter 20. The third connection trace C3 between the ninth series resonator S9 and the DMS resonator 21 can be electrically connected to the second grounding network G2 through the eighth parallel resonator P8. The third connection trace C3 between the tenth series resonator S10 and the eleventh series resonator S11 can be electrically connected to the second grounding network G2 through the ninth parallel resonator P9. Additionally, the end of the DMS resonator 21 without the third connection trace C3 can be electrically connected to the second grounding network G2.

[0073] For example, when the second filter 20 is a filter with a DMS structure, it can be a receiving filter.

[0074] in addition, Figure 5 and Figure 6 The example shown is merely an illustration of a case where a trapezoidal filter and a DMS filter share a common ground via a jumper trace. Figure 8 This is a schematic diagram of the circuit structure of another surface acoustic wave device provided in an embodiment of the present invention. Figure 9 Is with Figure 8 A corresponding circuit layout for a surface acoustic wave device, in conjunction with a reference. Figure 8 and Figure 9 The first filter 10 includes at least a twelfth series resonator S12, a DMS resonator 11, a thirteenth series resonator S13, a fourteenth series resonator S14, a tenth parallel resonator P10, an eleventh parallel resonator P11, and a twelfth parallel resonator P12. Each of the twelfth series resonator S12, DMS resonator 11, thirteenth series resonator S13, and fourteenth series resonator S14 has a fourth connecting trace C4 at both ends. The twelfth series resonator S12, DMS resonator 11, thirteenth series resonator S13, and fourteenth series resonator S14 are connected in series between the receiver and transmitter of the first filter 10 via the fourth connecting trace C4. The first terminal of the tenth parallel resonator P10 is electrically connected to the fourth connection trace C4 between the twelfth series resonator S12 and the DMS resonator 11. The first terminal of the eleventh parallel resonator P11 is electrically connected to the fourth connection trace C4 between the DMS resonator 11 and the thirteenth series resonator S13. The first terminal of the twelfth parallel resonator P12 is electrically connected to the fourth connection trace C4 between the thirteenth series resonator S13 and the fourteenth series resonator S14. This allows two DMS structure filters to share a common ground via a bridging trace, making both DMS structure filters receiver filters.

[0075] For example, Figure 10 yes Figure 2 The graph shown compares the performance of surface acoustic wave devices with existing technologies. Figure 11 yes Figure 4 The diagram shows a performance comparison between surface acoustic wave devices and existing technologies. Figure 10 and Figure 11 In the diagram, the solid line Q1 represents the signal spectrum without the two filters sharing a common ground in the prior art, and the dashed line Q2 represents the signal spectrum with the two filters sharing a common ground in the embodiment of this invention. Figure 10 and Figure 11 The vertical axis represents decibels (dB) and the horizontal axis represents frequency (GHz). For example... Figure 10 and Figure 11 As shown, after the two filters are connected to the same ground using the method of the embodiment of the present invention, the noise suppression of the surface acoustic wave device is effectively improved and the isolation of the surface acoustic wave device is enhanced.

[0076] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A surface acoustic wave device, characterized by, The surface acoustic wave device comprises: a first region and a second region; the surface acoustic wave device further comprises: at least one first cross-over trace; at least one first filter located in the first region; a first ground network corresponding to each of the first filters, and each of the first ground networks is located in the first region; a second filter corresponding to each of the first filters and located in the second region; a second ground network corresponding to each of the second filters, and each of the second ground networks is located in the second region; the first filter is electrically connected to the first ground network, and the second filter is electrically connected to the second ground network; the first cross-over trace crosses the first region and the second region, and one end of the first cross-over trace is electrically connected to the first ground network in the first region, and the other end of the first cross-over trace is electrically connected to the second ground network in the second region.

2. The SAW device of claim 1, wherein, The first region comprises at least two first filters and at least two first ground networks corresponding to each of the first filters, and the second region comprises at least two second filters and at least two second ground networks corresponding to each of the second filters; the first filter and the second filter electrically connected to the same first cross-over trace are a transmitting filter and a receiving filter, respectively.

3. The SAW device of claim 1, wherein, The first region comprises at least two first filters and at least two first ground networks corresponding to each of the first filters, and the second region comprises at least two second filters and at least two second ground networks corresponding to each of the second filters; the first filter and the second filter electrically connected to the same first cross-over trace are both transmitting filters.

4. The SAW device of claim 1, wherein, The first region comprises at least two first filters and at least two first ground networks corresponding to each of the first filters, and the second region comprises at least two second filters and at least two second ground networks corresponding to each of the second filters; the first filter and the second filter electrically connected to the same first cross-over trace are both receiving filters.

5. The SAW device of any one of claims 1, wherein, The first filter comprises at least a first series resonator, a second series resonator, a third series resonator, a fourth series resonator, a first parallel resonator, a second parallel resonator, a third parallel resonator, and a fourth parallel resonator; each of the series resonators is provided with a first connection trace at both ends, and the first series resonator, the second series resonator, the third series resonator, and the fourth series resonator are connected in series between the input end and the output end of the first filter through the first connection traces; The first end of the first parallel resonator is electrically connected to a first connection trace between the first series resonator and the second series resonator, the first end of the second parallel resonator is electrically connected to a first connection trace between the second series resonator and the third series resonator, the first end of the third parallel resonator is electrically connected to a first connection trace between the third series resonator and the fourth series resonator, and the first end of the fourth parallel resonator is electrically connected to a first connection trace on the side of the fourth series resonator away from the third series resonator; The second end of the first parallel resonator, the second end of the second parallel resonator, the second end of the third parallel resonator, and the second end of the fourth parallel resonator are all electrically connected to the first ground network.

6. The SAW device of claim 5, wherein, The second filter at least includes a fifth series resonator, a sixth series resonator, a seventh series resonator, an eighth series resonator, a fifth parallel resonator, a sixth parallel resonator, and a seventh parallel resonator; Both ends of each of the series resonators of the second filter are provided with a second connection trace, and the fifth series resonator, the sixth series resonator, and the seventh series resonator are connected in series between the input end and the output end of the second filter through the second connection traces; The first end of the fifth parallel resonator is electrically connected to a second connection trace between the fifth series resonator and the sixth series resonator, the first end of the sixth parallel resonator is electrically connected to a second connection trace between the sixth series resonator and the seventh series resonator, and the first end of the seventh parallel resonator is electrically connected to a second connection trace between the seventh series resonator and the eighth series resonator; The second end of the fifth parallel resonator, the second end of the sixth parallel resonator, and the second end of the seventh parallel resonator are all electrically connected to the second ground network.

7. The SAW device of claim 6, wherein, The first cross-over trace crosses one of the first connection traces, and the first cross-over trace is isolated from the crossed first connection trace by a cross-over bridge; And / or, the first cross-over trace crosses one of the second connection traces, and the first cross-over trace is isolated from the crossed second connection trace by a cross-over bridge.

8. The SAW device of claim 5, wherein, The second filter at least includes a ninth series resonator, a tenth series resonator, an eleventh series resonator, a DMS resonator, an eighth parallel resonator, and a ninth parallel resonator; Both ends of the ninth series resonator, the DMS resonator, the tenth series resonator, and the eleventh series resonator are provided with a third connection trace, and the ninth series resonator, the DMS resonator, the tenth series resonator, and the eleventh series resonator are connected in series between the receiving end and the transmitting end of the second filter through the third connection traces; The first end of the eighth parallel resonator is electrically connected to a third connection trace between the ninth series resonator and the DMS resonator, and the first end of the ninth parallel resonator is electrically connected to a third connection trace between the tenth series resonator and the eleventh series resonator; The DMS resonator, the second end of the eighth parallel resonator, and the second end of the ninth parallel resonator are each electrically connected to a second ground network.

9. The SAW device of claim 8, wherein, The second filter is a receive filter.

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