Patent ID: 12218646

DETAILED DESCRIPTION

In order to make objects, technical solutions and advantages of the embodiments of the disclosure apparent, the technical solutions of the embodiment will be described in a clearly and fully understandable way in connection with the drawings related to the embodiments of the disclosure. It is obvious that the described embodiments are just a part but not all of the embodiments of the disclosure. Based on the described embodiments herein, those skilled in the art can obtain other embodiment(s), without any inventive work, which should be within the scope of the disclosure.

Unless otherwise specified, the technical terms or scientific terms used in the disclosure shall have normal meanings understood by those skilled in the art. The words “first”, “second” and the like used in the disclosure do not indicate the sequence, the number or the importance but are only used for distinguishing different components. The word “comprise”, “include” or the like only indicates that an element or a component before the word contains elements or components listed after the word and equivalents thereof, not excluding other elements or components. The words “connection”, “connected” and the like are not limited to physical or mechanical connection but may include electrical connection, either directly or indirectly.

The embodiments of the present disclosure provide a surface acoustic wave resonator device, a method for manufacturing the same, and a filter. The surface acoustic wave resonator device includes an interdigital electrode body region, and includes: a piezoelectric substrate; a first interdigital electrode structure and a second interdigital electrode structure that are disposed on a side of the piezoelectric substrate and electrically isolated from each other, wherein the first interdigital electrode structure includes a first interdigital electrode, a first interdigital electrode connection part and a first interdigital electrode lead-out part that are electrically connected to each other, and the second interdigital electrode structure includes a second interdigital electrode, a second interdigital electrode connection part, and a second interdigital electrode lead-out part that are electrically connected to each other; wherein the first interdigital electrode and the second interdigital electrode extend along the first direction and are alternately arranged along the second direction, the first direction and the second direction intersect each other; the body portion of the first interdigital electrode and the body portion of the second interdigital electrode are located in the interdigital electrode body region, and each interdigital electrode has a first end and a second end opposite to each other in the first direction; the first interdigital electrode connection part and the first interdigital electrode lead-out part are respectively connected to the first end and the second end of the first interdigital electrode; the second interdigital electrode connection part and the second interdigital electrode lead-out part are respectively connected to the first end and the second end of the second interdigital electrode; and a spanning structure located between the first interdigital electrode connection part and the second interdigital electrode and between the second interdigital electrode connection part and the first interdigital electrode in a direction perpendicular to the main surface of the piezoelectric substrate; wherein the first interdigital electrode connection part and the second interdigital electrode connection part are respectively located on opposite sides of the interdigital electrode body region in the first direction and extend continuously along the second direction; the first interdigital electrode connection part is in contact with the first interdigital electrode and is electrically isolated from the second interdigital electrode through the spanning structure; and the second interdigital electrode connection part is in contact with the second interdigital electrode and is electrically isolated from the first interdigital electrode through the spanning structure.

The surface acoustic wave resonator device and the method for manufacturing the same, and the filter of the present disclosure at least have the following technical effects: through disposing the first interdigital electrode connection part and the second interdigital electrode connection part, suppression of clutter wave in the resonator device can be achieved, and through the above-described structural configuration, the ability of the first electrode connection part and the second interdigital electrode connection part to suppress clutter wave can be improved on the basis of ensuring that the first interdigital electrode structure and the second interdigital electrode structure are electrically isolated; moreover, the first interdigital electrode connection part and the second interdigital electrode connection part are electrically connected to the first interdigital electrode and the second interdigital electrode, respectively, so that the first interdigital electrode connection part and the first interdigital electrode have an equivalent electrical potential, and the second interdigital electrode connection part and the second interdigital electrode have an equivalent electrical potential; compared to the situation in the traditional resonator device where the metal structure that suppresses clutter wave and the plurality of first and second interdigital electrodes are all spaced apart by a dielectric layer, thereby forming an equivalent capacitance, the resonator device of the present application can avoid or reduce the possibility of capacitive breakdown being occurred when the voltage of the interdigital electrode(s) is high, thereby improving the reliability and device performance of the resonator device and the filter including the same.

FIG.1Aillustrates a schematic top view of a surface acoustic wave resonator device according to some embodiments of the present disclosure.FIG.1BandFIG.1Cillustrate schematic cross-sectional views of a surface acoustic wave resonator device according to some embodiments of the present disclosure, andFIG.1BandFIG.1Care cross-sectional views repetitively taken along the line B-B′ and the line C-C′ ofFIG.1A.

Referring toFIG.1AtoFIG.1C, the surface acoustic wave resonator device500includes an interdigital electrode body region CR, a first interdigital electrode end region ER1, a second interdigital electrode end region ER2, a first electrode lead-out region LR1and a second electrode lead-out region LR2, and includes a piezoelectric substrate100and an interdigital transducer105and a spanning structure106that are disposed on a side of the piezoelectric substrate100. The interdigital transducer105may include a first interdigital electrode structure101and a second interdigital electrode structure102that are electrically isolated from each other; for example, the first interdigital electrode structure101includes one or more first interdigital electrodes101a, a first interdigital electrode connection part101b, and a first interdigital electrode lead-out part101cthat are electrically connected to each other; and the second interdigital electrode structure102includes one or more second interdigital electrodes102a, a second interdigital electrode connection part102b, and a second interdigital electrode lead-out part102cthat are electrically connected to each other.

In a direction (e.g., a first direction D1) parallel to the main surface of the piezoelectric substrate100, the first interdigital electrode end region ER1and the second interdigital electrode end region ER2are located on opposite sides of the interdigital electrode body region CR; the first electrode lead-out region LR1is located on a side of the second interdigital electrode end region ER2away from the interdigital electrode body region CR, and the second electrode lead-out region LR1is located on a side of the first interdigital electrode end region ER1away from the interdigital electrode body region CR.

In some embodiments, the plurality of first interdigital electrodes101aand the plurality of second interdigital electrodes102aextend substantially parallel to each other along the first direction D1and are spaced apart from each other, and are alternately arranged along the second direction D2. The second direction D2is parallel to the main surface of the piezoelectric substrate100and intersects the first direction D1, for example, the direction D1and the direction D2are perpendicular to each other. The body portions of the first interdigital electrodes101aand the body portions of the second interdigital electrodes102aare located in the interdigital electrode body region CR, and the body portions of the first interdigital electrodes101aand the body portions of the second interdigital electrodes102aoverlap each other in the second direction D2. As used herein, two members overlap in a certain direction represents that the orthographic projections of the two members on a reference plane perpendicular to the direction overlap each other.

In some embodiments, the first interdigital electrode connection part101band the second interdigital electrode connection part102bare located on opposite sides of the interdigital electrode body region CR in the first direction D1, and may extend substantially parallel to each other along the second direction D2. For example, each interdigital electrode in the plurality of first interdigital electrodes101aand the plurality of second interdigital electrodes102ahas a first end and a second end opposite to each other in the first direction D1. The first interdigital electrode connection part101band the first interdigital electrode lead-out part101care respectively connected to the first ends and the second ends of the first interdigital electrodes101a; and the second interdigital electrode connection part102band the second interdigital electrode lead-out part102care respectively connected to the first ends and the second ends of the second interdigital electrodes102a.

In some embodiments, the spanning structure106is located between the first interdigital electrode connection part101band the second interdigital electrodes102ain a direction perpendicular to the main surface of the piezoelectric substrate100, and between the second interdigital electrode connection part102band the first interdigital electrodes101a. The spanning structure106may include a first spanning layer1061and a second spanning layer1062located on opposite sides of the interdigital electrode body region CR in the first direction D1. In some embodiments, the spanning structure106is located outside the interdigital electrode body region CR and does not cover the body portions of the first interdigital electrodes101aand the body portions of the second interdigital electrodes102a; that is, the orthographic projection of the spanning structure106on the piezoelectric substrate100may be offset from the orthographic projection of the body portions of the plurality of interdigital electrodes (including the first interdigital electrodes101aand the second interdigital electrodes102a) on the piezoelectric substrate100. For example, the first spanning layer1061and the second spanning layer1062may be located in the second interdigital electrode end region ER2and the first interdigital electrode end region ER1, respectively.

For example, the first interdigital electrode connection part101band the second interdigital electrode connection part102bare respectively located in the first interdigital electrode end region ER1and the second interdigital electrode end region ER2; the first interdigital electrode connection part101bextends continuously along the second direction D2, so as to be connected (, e.g., directly connected) with the first ends of the plurality of first interdigital electrodes101a, and be spaced apart from and electrically isolated from the plurality of second interdigital electrodes102athrough the second spanning layer1062of the spanning structure106; the second interdigital electrode connection part102bextends continuously along the second direction D2, so as to be connected (e.g., directly connected) with the first ends of the plurality of second interdigital electrodes102a, and be spaced apart from and electrically isolated from the plurality of first interdigital electrodes101athrough the first spanning layer1061of the spanning structure106. As used herein, two members are “directly connected” represents that the two members are connected by direct contact with each other, without being connected through other intermediate members.

In some embodiments, the orthographic projection of the plurality of first interdigital electrodes101aon the piezoelectric substrate100, the orthographic projection of the second interdigital electrode connection part102bon the piezoelectric substrate100, and the orthographic projection of first spanning layer1061on the piezoelectric substrate100partially overlap each other. The orthographic projection of the plurality of second interdigital electrodes102aon the piezoelectric substrate100, the orthographic projection of the first interdigital electrode connection part101bon the piezoelectric substrate100, and the orthographic projection of the second spanning layer1062on the piezoelectric substrate100partially overlap each other.

For example, the overlapping portions of the orthographic projection of the first interdigital electrodes101aand the orthographic projection of the second interdigital electrode connection part102bis located within the range of the orthographic projection of the first spanning layer1061; the overlapping portions of the orthographic projection of the second interdigital electrodes102aand the orthographic projection of the first interdigital electrode connection part101bis located within the range of the orthographic projection of the second spanning layer1062. For example, the area of the orthographic projection of the first spanning layer1061on the piezoelectric substrate may be greater than the area of the overlapping portion of the orthographic projections of the first interdigital electrodes101aand the second interdigital electrode connection part102b; the area of the orthographic projection of the second spanning layer1062on the piezoelectric substrate may be greater than the area of the overlapping portion of the orthographic projections of the second interdigital electrodes102aand the first interdigital electrode connection part101b, thereby effectively achieving electrical isolation between the first interdigital electrode structure and the second interdigital electrode structure.

In some embodiments, the first interdigital electrode connection part101band the second interdigital electrode connection part102bmay have substantially the same length L in the second direction D2, and the length L of the first interdigital electrode connection part101band the second interdigital electrode connection part102bin the second direction D2may be greater than or equal to the width W of the interdigital electrode body region CR in the second direction D2. As used herein, the width W of the interdigital electrode body region CR in the second direction D2refers to the distance between the outer sidewalls of two outermost interdigital electrodes (i.e., two end interdigital electrodes) of the plurality of first interdigital electrodes101aand the plurality of second interdigital electrodes102ain the second direction D2. The outer sidewall of the end interdigital electrode refers to the sidewall at the side away from other interdigital electrodes in the second direction D2and is opposite to the inner sidewall thereof facing the adjacent interdigital electrode.

Still referring toFIG.1AtoFIG.1C, in some embodiments, the first interdigital electrode connection part101band the second interdigital electrode connection part102bconstitute a clutter suppression structure, which can, for example, suppress clutter wave (or referred to as transverse wave in spurious mode) propagating in a direction parallel to the extension direction (e.g., the first direction D1) of the interdigital electrodes. For example, during the operation of the surface acoustic wave resonator device500a, the surface acoustic wave propagates along the arrangement direction (e.g., the second direction D2) of the plurality of first interdigital electrodes101aand the plurality of second interdigital electrodes102aof the interdigital transducer105. However, there may also exist some clutter wave propagating along the extension direction (e.g., the first direction D1) of the interdigital electrodes, and such clutter wave will cause energy loss, and further result in degradation of performance of the resonator and/or the filter including the same. In the embodiments of the present disclosure, the first interdigital electrode connection part101band the second interdigital electrode connection part102bthat are respectively connected to the ends of the corresponding interdigital electrodes and extend in the second direction can generate a region or interface where the acoustic wave propagation impedance changes, thereby suppressing clutter wave propagating in the first direction D1, and the clutter wave propagating in the direction D1can be reflected back into the resonator, thereby reducing energy loss.

The first interdigital electrode connection part101band the second interdigital electrode connection part102bmay respectively serve as a first clutter suppression substructure and a second clutter suppression substructure of the clutter suppression structure. That the two clutter suppression substructures extend continuously in the second direction and contact the corresponding interdigital electrodes can improve their ability of suppressing clutter wave. In some embodiments, at least part of the clutter suppression structure is in direct contact with the piezoelectric substrate100, which can further improve their ability of suppressing clutter wave.

For example, in the clutter suppression structure, at least part of the first interdigital electrode connection part101band at least part of the second interdigital electrode connection part102bare in direct contact with the piezoelectric substrate100; for example, the entire bottom surface of the second interdigital electrode connection part102bis in contact with the piezoelectric substrate100; a part of the bottom surface of the first interdigital electrode connection part101bis in contact with the piezoelectric substrate100, and another part of the bottom surface of the first interdigital electrode connection part101bis in contact with the spanning structure106.

For example, the surface acoustic wave resonator device may include a first electrode layer E1and a second electrode plate E2, a portion of the first electrode layer E1and a portion of the second electrode layer E2overlap each other in the direction perpendicular to the main surface of the piezoelectric substrate100. Moreover, the spanning structure106is at least located between the overlapping portions of the first electrode layer E1and the second electrode layer E2, so as to space apart the overlapping portions of the first electrode layer E1and the second electrode layer E2.

For example, the first electrode layer E1is disposed on a side of the piezoelectric substrate100; the spanning structure106is located on the piezoelectric substrate100and covers the sidewall of a portion of the first electrode layer E1and the surface thereof at the side away from the piezoelectric substrate; the second electrode layer E2is disposed on the side of the piezoelectric substrate100and is located on a side of the spanning structure106away from the first electrode layer E1. For example, the second electrode layer E2includes a body part P1and a protruding part P2; the protruding part P2covers the spanning structure106and is isolated from the portion of the first electrode layer E1covered by the spanning structure through the spanning structure106; and the body part P1is a part other than the protruding part P2of the second electrode layer.

The body part P1and the first electrode layer E1may be disposed side by side in a direction (for example, a horizontal direction including the first direction D1and the second direction D2) parallel to the main surface of the piezoelectric substrate100, and are spaced apart from each other in this embodiment. The body part P1and the first electrode layer E1may be located at the same level height relative to the piezoelectric substrate100; for example, at least a portion of the body part P1and the first electrode layer E1may be located at the same level height relative to the piezoelectric substrate100. The protruding part P2protrudes from the surfaces of the first electrode layer E1and the body part P1at the side away from the piezoelectric substrate100in a direction (e.g., the third direction D3) perpendicular to the main surface of the piezoelectric substrate. As used herein, two members being located at the same level height relative to the piezoelectric substrate represents that at least portions of the two members are substantially at the same distance from the main surface of the piezoelectric substrate in a direction perpendicular to the main surface of the piezoelectric substrate. For example, the main surface of the piezoelectric substrate may be the surface (i.e., the top surface illustrated in the figures) in contact with the interdigital transducer or may be the surface (i.e., the bottom surface illustrated in the figures) at the side away from the interdigital transducer. For example, the distance between the surface of the body part P1of the second electrode layer E2facing the piezoelectric substrate and the main surface of the piezoelectric substrate may be substantially equal to the distance between the surface of the first electrode layer E1facing the piezoelectric substrate and the main surface of the piezoelectric substrate. For example, the distances may all be zero. Alternatively, the distance from the surface of at least a portion (e.g., a portion of the interdigital electrode or the interdigital electrode connection part) of the body part P1at the side away from the piezoelectric substrate to the top surface of the piezoelectric substrate may be substantially equal to the distance from the surface of at least a portion (e.g., the interdigital electrode or the interdigital electrode connection part) of the first electrode layer E1at the side away from the piezoelectric substrate to the top surface of the piezoelectric substrate; the above distances are all distances in the direction (for example, the third direction D3) perpendicular to the main surface of the piezoelectric substrate.

In the embodiments of the present disclosure, the first interdigital electrode101aand the second interdigital electrode connection part102bare disposed in different electrode layers of the first electrode layer E1and the second electrode layer E2, and the second interdigital electrode102aand the first interdigital electrode connection part101bare disposed in different electrode layers of the first electrode layer E1and the second electrode layer E2. The first interdigital electrode101aand the second interdigital electrode102amay be disposed in the same or different electrode layers; the first interdigital electrode connection part101band the second interdigital electrode connection part102bmay be disposed in the same or different electrode layers; the first interdigital electrode lead-out part101cand the second interdigital electrode lead-out part102cmay each be disposed in any one of the first electrode layer and the second electrode layer, and the first interdigital electrode lead-out part101cand the second interdigital electrode lead-out part102cmay be, for example, disposed in the same layer as the first interdigital electrode101aand the second interdigital electrode102a, respectively.

Referring toFIG.1AtoFIG.1C, in some embodiments, the first electrode layer E1may include the first interdigital electrode structure101, that is, the plurality of first interdigital electrodes101a, the first interdigital electrode connection part101band the first interdigital electrode structure101are all disposed in the same first electrode layer E1, and may be integrally formed. The second electrode layer E2may include the second interdigital electrode structure102, that is, the plurality of second interdigital electrodes102a, the second interdigital electrode connection part102band the second interdigital electrode lead-out part102care all disposed in the same second electrode layer, and may be integrally formed.

In this embodiment, the protruding part P2of the second electrode layer E2includes one or more first protruding parts P2aand one or more second protruding parts P2b; for example, the plurality of second protruding parts P2binclude a plurality of portions of the first interdigital electrode connection part101bthat overlap the plurality of second interdigital electrodes102ain the third direction D3, and the plurality of first protruding parts P2ainclude respective portions of the plurality of first interdigital electrodes101athat overlap the second interdigital electrode connection parts102bin the third direction D3.

In the spanning structure106, at least part of the first spanning layer1061is located between the overlapping portions of the plurality of first interdigital electrodes101aand the second interdigital electrode connection part102b, so that the plurality of first interdigital electrodes101aare spaced apart from and electrically isolated from the second interdigital electrode connection part102b. At least part of the second spanning layer1062is located between the overlapping portions of the plurality of second interdigital electrodes102aand the first interdigital electrode connection part101b, so that the second interdigital electrodes102aare spaced apart from and electrically isolated from the first interdigital electrode connection part101b.

For example, the first spanning layer1061includes a plurality of first spanning patterns106aseparated from each other, and has one or more first openings G1; the plurality of first spanning patterns106amay be arranged at intervals along the second direction D2, and the first openings G1are located between adjacent first spanning patterns106aor laterally aside the first spanning patterns106ain the second direction D2. Each first spanning pattern106acovers the opposite sidewalls in the first direction D1of a portion of the second interdigital electrode connection part102bthat overlaps the corresponding one of the first interdigital electrodes101aand the surface thereof at the side away from the piezoelectric substrate; each first interdigital electrode101aextends across a corresponding one of the first spanning patterns106ain the first direction D1, and the first protruding part P2aof the first interdigital electrode101ais located on the first spanning pattern106a, thereby being physically and electrically isolated from the second interdigital electrode connection part102bthrough the first spanning pattern. In some embodiments, the plurality of first interdigital electrodes101aand the plurality of first spanning patterns106amay be disposed in one-to-one correspondence.

For example, the second spanning layer1062includes a plurality of second spanning patterns106bseparated from each other, and has one or more second openings G2; the plurality of second spanning patterns106bmay be arranged at intervals along the second direction D2, and the second openings G2are located between adjacent second spanning patterns106bor laterally aside the second spanning patterns106bin the second direction D2. Each second spanning pattern106bcovers the opposite sidewalls in the second direction of a portion of a corresponding second interdigital electrode102athat overlaps the first interdigital electrode connection part101band the surface thereof at the side away from the piezoelectric substrate; the first interdigital electrode connection part101bextends across the plurality of second spanning patterns106band the plurality of second interdigital electrodes102ain the second direction D2, and the plurality of second protruding parts P2bof the first interdigital electrode connection part101b, the plurality of second spanning patterns106band the plurality of second interdigital electrodes102amay be disposed in one-to-one correspondence. Each second protruding part P2bis physically and electrically isolated from the second interdigital electrode102athrough the corresponding second spanning pattern106b.

In some embodiments, in the first electrode layer and the second electrode layer, portions where the second interdigital electrode connection part and the second interdigital electrodes are connected (e.g., directly connected) to each other is located in the first openings of the first spanning layer, and portions where the first interdigital electrode connection part and the first interdigital electrodes are connected (e.g., directly connected) to each other are located in the second openings of the second spanning layer.

For example, as illustrated inFIG.1AtoFIG.1C, the first opening G1of the first spanning layer1061exposes a portion of the first electrode layer E1, for example, exposes a portion of the first electrode layer where the second interdigital electrode connection part102band the second interdigital electrode102aare directly connected to each other. A portion of the second electrode layer E2is filled in the second openings G2of the second spanning layer1062, and the portion of the second electrode layer E2, for example, includes a portion where the first interdigital electrode connection part101band the first interdigital electrode101aare directly connected to each other.

In some embodiments, the thicknesses of the first interdigital electrode connection part101band the second interdigital electrode connection part102bmay be the same as or different from the thicknesses of the first interdigital electrode101aand the second interdigital electrode102a. For example, the thicknesses of the first interdigital electrode connection part101band the second interdigital electrode connection part102bmay be greater than the thicknesses of the first interdigital electrode101aand the second interdigital electrode102a. In some examples, in the case that the first electrode connection part101band the second electrode connection part102bhave a greater thickness, the ability of suppressing clutter wave of the clutter suppression structure constituted by the first interdigital electrode connection part and the second interdigital electrode connection part may be further increased to a certain extent. For example, the body portions of the first interdigital electrodes101aand the second interdigital electrodes102alocated in the interdigital electrode body region CR may have substantially the same thickness t1, the first interdigital electrode connection part101band the second interdigital electrode connection part102bmay have substantially the same thickness t2, and a ratio of the thickness t2to the thickness t1may range from approximately 1 to 1.6. However, the present disclosure is not limited thereto.

FIG.2illustrates a schematic top view of a surface acoustic wave resonator device500baccording to some other embodiments of the present disclosure. The surface acoustic wave resonator device500bis similar to the surface acoustic wave resonator device500aof the previous embodiments, except that the spanning structure106of the surface acoustic wave resonator device500bis a continuous pattern in each interdigital electrode end region.

Referring toFIG.2, in some embodiments, the spanning structure106includes a first spanning layer1061and a second spanning layer1062. The first spanning layer1061and the second spanning layer1062extend continuously along the second direction D2in the second interdigital electrode end region ER2and the first interdigital electrode end region ER1respectively. The first spanning layer1061is located between the first electrode layer E1(e.g., the second interdigital electrode connection part102b) and the second electrode layer E2(e.g., the plurality of first interdigital electrodes101a) in the third direction, and the sidewalls of the second interdigital electrode connection part102band the surface thereof at the side away from the piezoelectric substrate may be completely covered by the first spanning layer1061. The second spanning layer1062is located between the first electrode layer E1(e.g., the plurality of second interdigital electrodes102a) and the second electrode layer E2(e.g., the first interdigital electrode connection part101b), and between the second electrode layer E2(e.g., the first interdigital electrode connection part101b) and the piezoelectric substrate100.

FIG.3Aillustrates a schematic top view of a surface acoustic wave resonator device500caccording to some other embodiments of the present disclosure.FIG.3BandFIG.3Cillustrate schematic cross-sectional views of the surface acoustic wave resonator device500caccording to some other embodiments of the present disclosure.FIG.3BandFIG.3Care respectively cross-sectional views taken along a line B-B′ and a line C-C′ ofFIG.3A. The surface acoustic wave resonator device500cof this embodiment is similar to the aforementioned surface acoustic wave resonator device500a. The difference lies in that in this embodiment, the positional relationship of the respective interdigital electrodes and the interdigital electrode connection part is different. The differences of this embodiment will be described in detail below, and features similar to the previous embodiments will not be repeated.

Referring toFIG.3AtoFIG.3C, in some embodiments, the first interdigital electrodes101aand the first interdigital electrode connection part101bmay be located in different electrode layers; the second interdigital electrodes102aand the second interdigital electrode connection part102bmay be located in different electrode layers. The first interdigital electrode connection part101band the second interdigital electrode connection part102bmay be disposed in the same electrode layer; the plurality of first interdigital electrodes101aand the plurality of second interdigital electrodes102amay be disposed in the same electrode layer. As used herein, that two members are “disposed in the same layer” or located in “the same layer” represents that the two members may be formed by a same material layer through a same patterning process.

For example, in some embodiments, the first electrode layer E1may include at least a first interdigital electrode connection part101band a second interdigital electrode connection part102b. The second electrode layer E2may include a plurality of first interdigital electrodes101a, a plurality of second interdigital electrodes102a, a first interdigital electrode lead-out part101c, and a second interdigital electrode lead-out part102c. That is, the first interdigital electrode connection part101band the second interdigital electrode connection part102bmay be disposed in the same first electrode layer E1; the plurality of first interdigital electrodes101aand the plurality of second interdigital electrodes102amay be disposed in the same second electrode layer E2. The spanning structure106is disposed between the first interdigital electrode connection part101bof the first electrode layer E1and the plurality of second interdigital electrodes102aof the second electrode layer E2, and between the second interdigital electrode connection part102bof the first electrode layer E1and the plurality of first interdigital electrodes101aof the second electrode layer E2.

In this example, the first interdigital electrode connection part101band the second interdigital electrode connection part102bof the first electrode layer E1are respectively in contact with and electrically connected to the plurality of first interdigital electrodes101aand the plurality of second interdigital electrodes101aof the second electrode layer E2. For example, the plurality of first interdigital electrodes101aeach extend in the first direction D1from the first electrode lead-out region LR1across the second interdigital electrode end region ER2, the interdigital electrode body region CR and extend to the first interdigital electrode end region ER1, so as to be connected to the first interdigital electrode connection part101b. In some embodiments, the plurality of first interdigital electrodes101aat least extend to be in contact with the sidewall of the first interdigital electrode connection part101b; in some examples, the plurality of first interdigital electrodes101amay further extend to cover and contact the surface (e.g., the top surface illustrated in the figures) of the first interdigital electrode connection part101bat the side away from the piezoelectric substrate100. A portion of the first interdigital electrode101acovering the top surface of the first interdigital electrode connection part101bmay also be referred to as a first interdigital electrode additional part AP1. That is to say, one or more first interdigital electrode additional parts AP1may be located in the first interdigital electrode end region ER1, and overlap the first interdigital electrode connection part101bin the third direction D3perpendicular to the main surface of the piezoelectric substrate100. For example, the plurality of first interdigital electrode additional parts AP1may, together with the first interdigital electrode connection part101b, serve as a part (e.g., a first clutter suppression substructure) of the clutter suppression structure.

One or more second interdigital electrodes102aeach extend in the first direction D1from the second electrode lead-out region LR2across the first interdigital electrode end region ER1, the interdigital electrode body region CR and extend to the second interdigital electrode end region ER2, so as to be connected to the second interdigital electrode connection part102b. In some embodiments, the plurality of second interdigital electrodes102aat least extend to be in contact with the sidewall of the second interdigital electrode connection part102b; in some examples, the plurality of second interdigital electrodes102amay further extend to cover and contact the surface (e.g., the top surface illustrated in the figures) of the second interdigital electrode connection part102bat the side away from the piezoelectric substrate100. A portion of the second interdigital electrode102acovering the top surface of the second interdigital electrode connection part102bmay also be referred to as a second interdigital electrode additional part AP2. That is to say, one or more second interdigital electrode additional parts AP2may be located in the second interdigital electrode end region ER2, and overlap the second interdigital electrode connection part102bin the third direction D3perpendicular to the main surface of the piezoelectric substrate100. For example, a plurality of second interdigital electrode additional parts AP2may, together with the second interdigital electrode connection part101b, serve as a part (e.g., a second clutter suppression substructure) of the clutter suppression structure.

In some embodiments, the sidewall of the first interdigital electrode additional part AP1at the side away from the body portion of the first interdigital electrode101ain the first direction D1may be substantially aligned with the sidewall of the first interdigital electrode connection part101bfacing the second interdigital electrode lead-out part102cin the third direction D3. The sidewall of the second interdigital electrode additional part AP2at the side away from the body portion of the second interdigital electrode102ain the first direction D1may be substantially aligned with the sidewall of the second interdigital electrode connection part102bfacing the first interdigital electrode lead-out part101cin the third direction D3. However, the present disclosure is not limited thereto.

In this embodiment, the plurality of protruding parts P2of the second electrode layer E2include a plurality of first protruding parts P2aand a plurality of second protruding parts P2b; the spanning structure106includes a first spanning layer1061having a plurality of first spanning patterns106aand a second spanning layer1062having a plurality of second spanning patterns106b. The plurality of first protruding parts P2aand the plurality of second protruding parts P2bof the second electrode layer E2are respectively spaced apart from the corresponding portions of the first electrode layer by the first spanning layer1061and the second spanning layer1062.

The protruding part P2of the second electrode layer E2may include a portion of the first interdigital electrode101alocated between the interdigital electrode body region CR and the first interdigital electrode lead-out part101cin the first direction D1and a portion of the second interdigital electrode102alocated between the interdigital electrode body region CR and the second interdigital electrode lead-out part102cin the first direction D1.

For example, the plurality of first protruding parts P2ainclude portions of the plurality of first interdigital electrodes101aoverlapping with the second interdigital electrode connection part102bin the third direction D3, and the portions of the plurality of first interdigital electrodes101aare located between the interdigital electrode body region CR and the first interdigital electrode lead-out region LR1in the first direction D1. The plurality of first spanning patterns106aand the plurality of first protruding parts P2amay be disposed in one-to-one correspondence; each first spanning pattern106amay cover part of the sidewalls (e.g., the opposite sidewalls in the first direction and/or one of the opposite sidewalls in the second direction) of the second interdigital electrode connection part102band the surface thereof at the side away from the piezoelectric substrate100. The first protruding part P2aextends across the corresponding first spanning pattern106ain the first direction D1, and is spaced apart and electrically isolated from the second interdigital electrode connection part102bthrough the first spanning pattern106a.

For example, the plurality of second protruding parts P2binclude portions of the plurality of second interdigital electrodes102aoverlapping with the first interdigital electrode connection part101bin the third direction D3, and the portions of the plurality of second interdigital electrodes102aare located between the interdigital electrode body region CR and the second interdigital electrode lead-out region LR2in the first direction D1. The plurality of second spanning patterns106band the plurality of second protruding parts P2bmay be disposed in one-to-one correspondence; each second spanning pattern106bmay cover part of the sidewalls (e.g., the opposite sidewalls in the first direction and/or one of the opposite sidewalls in the second direction) of the first interdigital electrode connection part101band the surface thereof at the side away from the piezoelectric substrate100. The second protruding part P2bextends across the corresponding second spanning pattern106bin the first direction D1, and is spaced apart and electrically isolated from the first interdigital electrode connection part102athrough the second spanning pattern106b.

In this embodiment, the plurality of first spanning patterns106aare spaced apart from each other to expose portions of the second interdigital electrode connection part102b, so that the second interdigital electrodes102aof the subsequently formed second electrode layer can be connected to the exposed portions of the second interdigital electrode connection part102b. Likewise, the plurality of second spanning patterns106bare spaced apart from each other to expose portions of the first interdigital electrode connection part101b, so that the first interdigital electrodes101aof the subsequently formed second electrode layer can be connected to the exposed portions of the first interdigital electrode connection part101b.

For example, in the first spanning layer1061, the plurality of first spanning patterns106aare arranged at intervals from each other along the second direction D2; that is, the first spanning layer1061has one or more first openings G1located between adjacent first spanning patterns106a, or laterally aside the first spanning pattern106ain the second direction D2. The first opening G1exposes a portion of the surface of the second interdigital electrode connection part102b, and the first interdigital electrode102aextends into the first opening G1to be connected to the second interdigital electrode connection part102b. In some embodiments, the second interdigital electrode additional part AP2of the second interdigital electrode102ais located in the opening G1and on the surface of the second interdigital electrode connection part102bat the side away from the piezoelectric substrate100.

In some embodiments, the second interdigital electrode additional part AP2is located laterally aside the first spanning pattern106ain the second direction D2, and may be spaced apart from the first spanning pattern106a. The width of the second interdigital electrode additional part AP2in the second direction D2may be substantially the same as the width in the second direction D2of the body portion of the second interdigital electrode102alocated in the interdigital electrode body region CR. However, the present disclosure is not limited thereto.

Referring toFIG.3AandFIG.3C, for example, in the second spanning layer1062, the plurality of second spanning patterns106bare arranged at intervals along the second direction D2; that is, the second spanning layer1062has one or more second openings G2located between adjacent second spanning patterns106b, or laterally aside the second spanning pattern106bin the second direction D2. The second opening G2exposes a portion of the surface of the first interdigital electrode connection part101b, and the first interdigital electrode101aextends into the second opening G2to be connected to the first interdigital electrode connection part101b. In some embodiments, the first interdigital electrode additional part AP1of the first interdigital electrode101amay be in the second opening G2and extend to be on the surface of the first interdigital electrode connection part101bat the side away from the piezoelectric substrate100.

In some embodiments, the first interdigital electrode additional part AP1is located laterally aside the second spanning pattern106bin the second direction D2, and may be spaced apart from the second spanning pattern106b. The width of the first interdigital electrode additional part AP1in the second direction D2may be substantially the same as the width in the second direction D2of the body portion of the first interdigital electrode101alocated in the interdigital electrode body region CR. However, the present disclosure is not limited thereto.

In some embodiments, the width of each first spanning pattern106ain the first direction D1is greater than the width of the second interdigital electrode connection part102bin the first direction D1, such that the opposite sidewalls of the corresponding portion of the second interdigital electrode connection part102bin the first direction D1are both covered by the first spanning pattern106a. In some embodiments, the width of each first spanning pattern106ain the second direction D2is greater than the width of the first interdigital electrode101ain the second direction D2, such that in the second direction D2, the opposite sidewalls of the first spanning pattern106amay extend beyond the opposite sidewalls of the corresponding first interdigital electrode101a. In an alternative embodiment, the width of each first spanning pattern106ain the second direction D2may also be substantially equal to the width of the first interdigital electrode101ain the second direction D2, and the opposite sidewalls of the first spanning pattern106ain the second direction D2may be substantially aligned, in the third direction D3, with the opposite sidewalls of the first interdigital electrode101ain the second direction D2.

Similarly, the width of each second spanning pattern106bin the first direction D1may be greater than the width of the first interdigital electrode connection part101bin the first direction D1, such that the opposite sidewalls of the corresponding portion of the first interdigital electrode connection part101bin the first direction D1are both covered by the second spanning pattern106b. In some embodiments, the width of each second spanning pattern106bin the second direction D2is greater than the width of the second interdigital electrode102ain the second direction D2, such that in the second direction D2, the opposite sidewalls of the second spanning pattern106bmay extend beyond the opposite sidewalls of the corresponding second interdigital electrode102a. In an alternative embodiment, the width of each second spanning pattern106bin the second direction D2may also be substantially equal to the width of the second interdigital electrode102ain the second direction D2, and the opposite sidewalls of the second spanning pattern106bin the second direction D2may be substantially aligned, in the third direction D3, with the opposite sidewalls of the second interdigital electrode102ain the second direction D2. Through the above size configuration of the first spanning pattern and the second spanning pattern, it can be ensured that the spanning patterns can effectively isolate the first interdigital electrode structure and the second interdigital electrode structure from each other.

FIG.4Aillustrates a top view of a surface acoustic wave resonator device500daccording to alternative embodiments of the present disclosure, andFIG.4BandFIG.4Crespectively illustrate cross-sectional views of the surface acoustic wave resonator device500daccording to alternative embodiments of the present disclosure.FIG.4BandFIG.4Care cross-sectional views taken along a line B-B′ and a line C-C′ ofFIG.4A, respectively. The difference between the surface acoustic wave resonator device500dand the surface acoustic wave resonator device500clies in that: in the surface acoustic wave resonator device500d, the width of the interdigital electrode additional part may be different from the width of the body portion of the corresponding interdigital electrode located in the interdigital electrode body region. The differences between this embodiment and the previous embodiments will be described in detail below, and features the same as those in the previous embodiments are not described again here.

Referring toFIG.4AtoFIG.4C, in some embodiments, the width of the interdigital electrode additional part in the second direction may be greater than the width of the body portion of the corresponding interdigital electrode located in the interdigital electrode body region in the second direction; the interdigital electrode additional part may extend in the second direction to be in contact with the sidewall of the corresponding spanning pattern; or the interdigital electrode additional part may also be spaced apart from the corresponding spanning pattern without being in contact with the spanning pattern. In the examples where the interdigital electrode additional part contacts the sidewall of the spanning pattern, the spanning pattern may extend beyond the sidewalls of the overlying interdigital electrode thereof in the second direction, and the interdigital electrode additional part does not extend to the surface of the spanning pattern at the side away from the piezoelectric substrate in the third direction, thereby avoiding the interdigital electrode additional part from being connected to another interdigital electrode overlying the spanning pattern; for example, the surface (e.g., the top surface as illustrated in the figures) of the interdigital electrode additional part at the side away from the piezoelectric substrate may be lower than the surface (e.g., the top surface as illustrated in the figures) of the corresponding spanning pattern at the side away from the piezoelectric substrate; that is, the height of the surface of the interdigital electrode additional part at the side away from the piezoelectric substrate relative to the main surface of the piezoelectric substrate is lower than the height of the surface of the corresponding spanning pattern at the side away from the piezoelectric substrate relative to the main surface of the piezoelectric substrate, but the present disclosure is not limited thereto. The position and size of the interdigital electrode additional part can be adjusted according to product requirements and design, as long as the additional part of one of the first interdigital electrode and the second interdigital electrode can be electrically isolated from the other one of the first interdigital electrode and the second interdigital electrode through the corresponding spanning pattern.

For example, as illustrated inFIG.4AandFIG.4B, the width of the second interdigital electrode additional part AP2in the second direction D2may be greater than the width of the body portion of the second interdigital electrode102alocated in the interdigital electrode body region CR in the second direction D2, and the second interdigital electrode additional part AP2may be in contact with the sidewall of the first spanning pattern106a, but the present disclosure is not limited thereto. In an alternative embodiment, the width of the second interdigital electrode additional part AP2in the second direction D2is greater than the width of the body portion of the second interdigital electrode102ain the second direction D2, and the second interdigital electrode additional part AP2is spaced apart from and not in contact with the first spanning pattern106a. As illustrated inFIG.4AandFIG.4C, the width of the first interdigital electrode additional part AP1in the second direction D2may be greater than the width of the first interdigital electrode101ain the second direction D2, and the first interdigital electrode additional part AP1may be in contact with the sidewall of the second spanning pattern106b, but the present disclosure is not limited thereto. In an alternative embodiment, the width of the first interdigital electrode additional part AP1in the second direction D2is greater than the width of the body portion of the first interdigital electrode101ain the second direction D2, and the first interdigital electrode additional part AP1is spaced apart from and not in contact with the second spanning pattern106b.

FIG.5Aillustrates a schematic top view of a surface acoustic wave resonator device500eaccording to still some other embodiments of the present disclosure.FIG.5BandFIG.5Cillustrate schematic cross-sectional views of the surface acoustic wave resonator device500eaccording to still some other embodiments of the present disclosure.FIG.5BandFIG.5Care cross-sectional views respectively taken along a line B-B′ and a line C-C′ ofFIG.5A. The surface acoustic wave resonator device500eof this embodiment is similar to the surface acoustic wave resonator devices described in the previous embodiments. The difference lies in that: in this embodiment, the first interdigital electrodes101aand the second interdigital electrodes102aare disposed in the same first electrode layer, while the first interdigital electrode connection part101band the second interdigital electrode connection part102bare disposed in the same second electrode layer E2.

Referring toFIG.5AtoFIG.5C, in some embodiments, the first electrode layer E1may include one or more first interdigital electrodes101a, one or more second interdigital electrodes102a, a first interdigital electrode lead-out part101c, and a second interdigital electrode lead-out part102c. The second electrode layer E2may include a first interdigital electrode connection part101band a second interdigital electrode connection part102b. The first interdigital electrodes101aand the second interdigital electrodes102amay extend from the respective electrode lead-out regions to corresponding interdigital electrode end regions in the first direction D1, and the first interdigital electrode connection part101band the second interdigital electrode connection part102bare respectively located in the corresponding interdigital electrode end regions, and extend across one or more second interdigital electrodes102aand one or more first interdigital electrodes101aalong the second direction D2, and are respectively connected to the first interdigital electrodes101aand the second interdigital electrodes102a.

In some embodiments, the orthographic projection of the first interdigital electrode connection part101bon the piezoelectric substrate100overlaps the orthographic projections of the first interdigital electrodes101aon the piezoelectric substrate100, and the first interdigital electrode connection part101bmay cover and contact sidewalls of portions of the first interdigital electrodes101alocated in the end region and surfaces thereof at the side away from the piezoelectric substrate100. The orthographic projection of the second interdigital electrode connection part102bon the piezoelectric substrate100may overlap the orthographic projections of the second interdigital electrodes102aon the piezoelectric substrate100, and the second interdigital electrode connection part102bmay cover and contact sidewalls of portions of the second interdigital electrodes102alocated in the end region and surfaces thereof at the side away from the piezoelectric substrate100. However, the present disclosure is not limited thereto.

In alternative embodiments, the first interdigital electrodes101aand the second interdigital electrodes102amay respectively extend only to positions in the corresponding end regions where they join the subsequently formed interdigital electrode connection parts. In this way, the first interdigital electrode connection part101bmay only contact the sidewalls of the first interdigital electrodes101aextending along the second direction D2, without covering the surfaces of the first interdigital electrodes at the side away from the piezoelectric substrate; the second interdigital electrode connection part102bmay only contact the sidewalls of the second interdigital electrodes102aextending along the second direction D2, without covering the surfaces of the second interdigital electrodes at the side away from the piezoelectric substrate; the orthographic projection of the first interdigital electrode connection part101bon the piezoelectric substrate100and the orthographic projection of the first interdigital electrode101aon the piezoelectric substrate100may border (i.e., be connected with, contact) each other but do not overlap; the orthographic projection of the second interdigital electrode connection part102bon the piezoelectric substrate100and the orthographic projection of the second interdigital electrode102aon the piezoelectric substrate100may border each other but do not overlap.

In some embodiments, the first interdigital electrode connection part101bis electrically isolated from the second interdigital electrodes102athrough the second spanning layer1062; and the second interdigital electrode connection part102bis electrically isolated from the first interdigital electrodes101athrough the first spanning layer1061.

As illustrated inFIG.5AandFIG.5B, for example, the first spanning layer1061may include one or more first spanning patterns106a, and the one or more first spanning patterns106amay be disposed in one-to-one correspondence with the one or more first interdigital electrodes101a; for example, a plurality of first interdigital electrodes101aare arranged along the second direction D2, and a plurality of first spanning patterns106aare also arranged along the second direction D2and spaced apart from each other. Each first spanning pattern106ais disposed on a side of the corresponding first interdigital electrode101aaway from the piezoelectric substrate100, covering opposite sidewalls of the first interdigital electrode101ain the second direction D2and the surface thereof at the side away from the piezoelectric substrate100. The surface (i.e., the bottom surface illustrated in the figures) of the first spanning pattern106aat the side close to the piezoelectric substrate may be in contact with the piezoelectric substrate100.

The first spanning layer1061has one or more first openings G1, which are disposed on laterally aside the first spanning patterns106aand/or between adjacent first spanning patterns106ain the second direction D2. The first opening G1of the first spanning layer1061exposes a portion of the surface of the second interdigital electrode102alocated in the second interdigital electrode end region. The second interdigital electrode connection part102bis disposed on the first spanning layer1061, so as to be electrically isolated from the first interdigital electrodes101athrough the first spanning layer1061, and is filled in the first openings G1of the first spanning layer1061, so as to be adjacent to the second interdigital electrodes102a. For example, the second interdigital electrode connection part102bmay extend continuously in the second direction along the surface of the first spanning layer1061and the surfaces of the second interdigital electrodes102aand/or the piezoelectric substrate100exposed in the first openings G1.

As illustrated inFIG.5AandFIG.5C, for example, the second spanning layer1062may include one or more second spanning patterns106b, and the one or more second spanning patterns106bmay be disposed in one-to-one correspondence with the one or more second interdigital electrodes102a; for example, a plurality of second interdigital electrodes102aare arranged at intervals along the second direction D2, and a plurality of second spanning patterns106bare also arranged at intervals from each other along the second direction D2. Each second spanning pattern106bis disposed on a side of the corresponding second interdigital electrode102aaway from the piezoelectric substrate100, covering opposite sidewalls of the second interdigital electrode102ain the second direction D2and the surface thereof at the side away from the piezoelectric substrate. Moreover, the surface (i.e., the bottom surface illustrated in the figures) of the second spanning pattern106bat the side close to the piezoelectric substrate100may be in contact with the piezoelectric substrate100.

The second spanning layer1062has one or more second openings G2disposed laterally aside the second spanning pattern106band/or between adjacent second spanning patterns106bin the second direction D2. The second opening G2of the second spanning layer1062exposes a portion of the surface of the first interdigital electrode101alocated in the first interdigital electrode end region. The first interdigital electrode connection part101bis disposed on the second spanning layer1062, so as to be electrically isolated from the second interdigital electrodes102athrough the second spanning layer1062, and is filled in the second openings G2of the second spanning layer1062to be connected to the first interdigital electrodes101a. For example, the first interdigital electrode connection part101bmay extend continuously in the second direction along the surface of the second spanning layer1062and the surfaces of the first interdigital electrodes101aand/or the piezoelectric substrate100exposed in the second openings G2.

In the surface acoustic wave resonator devices500c,500d, and500eillustrated inFIG.3AtoFIG.5B, the first clutter suppression substructure and the second clutter suppression substructure of the clutter suppression structure respectively include the first interdigital connection part and the second interdigital electrode connection part. Besides, the first clutter suppression substructure may further include a portion (e.g., the first interdigital electrode additional part) of the first interdigital electrode that overlaps the first interdigital electrode connection part in the third direction, and the second clutter suppression substructure may further include a portion of the second interdigital electrode that overlaps the second interdigital electrode connection part in the third direction. In some embodiments, such a configuration increases the thicknesses of at least part of the first clutter suppression substructure and at least part of the second clutter suppression substructure in the direction perpendicular to the main surface of the piezoelectric substrate, thereby facilitating further improving the clutter suppression ability of the clutter suppression structure to some extent. In some embodiments, for example, in the surface acoustic wave resonator device500d, the widths of the corresponding interdigital electrode additional parts in the second direction is increased, thereby increasing the thickened area in the clutter suppression structure and further improving the clutter suppression ability of the clutter suppression structure to some extent.

Referring toFIG.3AtoFIG.5B, in some embodiments, the surface acoustic wave resonator device may further include a first conductive connector121and a second conductive connector122. The first conductive connector121and the second conductive connector122are respectively disposed on the first interdigital electrode lead-out part101cand the second interdigital electrode lead-out part102c, for example, disposed on sides of the first interdigital electrode lead-out part101cand the second interdigital electrode lead-out part102caway from the piezoelectric substrate100. The first conductive connector121and the second conductive connector122at least partially overlap or may completely overlap the first interdigital electrode lead-out part101cand the second interdigital electrode lead-out part102cin the third direction D3perpendicular to the main surface of the piezoelectric substrate100, respectively. The first conductive connector121is electrically connected to the first interdigital electrode lead-out part101c, and electrically connected to the plurality of first interdigital electrodes101athrough the first interdigital electrode lead-out part101c. The second conductive connector122is electrically connected to the second interdigital electrode lead-out part102c, and electrically connected to the plurality of second interdigital electrodes102athrough the second interdigital electrode lead-out part102c.

In various embodiments, the surface acoustic wave resonator device may further include a temperature compensation layer. For example, as illustrated inFIG.1BtoFIG.1D, the temperature compensation layer125is disposed on the piezoelectric substrate100and covers the interdigital transducer105and the spanning structure106. In some embodiments, the temperature compensation layer125may further cover portions of the surfaces (e.g., sidewalls) of the first conductive connector121and the second conductive connector122. The temperature compensation layer125may, for example, include silicon oxide. The temperature compensation layer125may be in contact with part of the surface of the piezoelectric substrate100and may cover the sidewalls of the interdigital transducer and the surface thereof at the side away from the piezoelectric substrate, as well as the sidewalls of the spanning structure and part of the surface thereof at the side away from the piezoelectric substrate. In some embodiments, the material of the spanning structure may be the same as or different from the material of the temperature compensation layer; for example, the material of the spanning structure may be selected from at least one of organic dielectric materials and inorganic dielectric materials, for example, the material of the spanning structure may include a dielectric or insulating material such as silicon oxide, silicon nitride, silicon oxynitride, polyimide, or the like. In some embodiments, the material of the spanning structure is different from the material of the temperature compensation layer, and the spanning structure may select a dielectric material having a high dielectric constant; for example, the dielectric constant of the spanning structure may be greater than the dielectric constant of the temperature compensation layer.

Because the first interdigital electrode connection part and the second interdigital electrode connection part respectively overlap the second interdigital electrodes and the first interdigital electrodes in the third direction, and the spanning structure is located between the first interdigital electrode connection part and the second interdigital electrodes, and between the second interdigital electrode connection part and the first interdigital electrodes. As a result, the first interdigital electrode connection part, the second spanning layer and the second interdigital electrodes will form a parasitic capacitance structure, and the second interdigital electrode connection part, the first spanning layer and the first interdigital electrodes will form a parasitic capacitance structure. Using a material having a high dielectric constant for the spanning structure can have the following advantages: on the one hand, the insulation ability of the spanning structure is improved, thereby effectively making the first interdigital electrode structure and the second interdigital electrode structure be electrically isolated from each other; on the other hand, under certain voltages, the two electrodes of the parasitic capacitance structure may generate a high electric field, in this case, the spanning material having a high dielectric constant may avoid capacitive breakdown from being occurred, thus ensuring the stability of the first interdigital electrode structure and the second interdigital electrode structure, and improving the reliability and device performance of the resonator device. Therefore, suitable materials may be selected for the temperature compensation layer and the spanning structure respectively, thereby avoiding or greatly reducing the possibility of breakdown being occurred to the dielectric material (i.e., the spanning layer) between the overlap portions of the first interdigital electrode structure and the second interdigital electrode structure while satisfying the temperature compensation performance of the resonator device.

In various embodiments of the present disclosure, the first interdigital electrode lead-out part101cand the second interdigital electrode lead-out part102cmay each be formed in any one of the first electrode layer E1and the second electrode layer E2; for example, in the surface acoustic wave resonator devices500ato500eillustrated inFIG.1AtoFIG.5A, the first interdigital electrode lead-out part101cand the first interdigital electrodes101aare disposed in the same layer and integrally formed, and the second interdigital electrode lead-out part102cand the second interdigital electrodes102aare disposed in the same layer and integrally formed, but the present disclosure is not limited thereto. In alternative embodiments, the first interdigital electrode lead-out part101cmay also be disposed in a different electrode layer from the first interdigital electrodes101a, and the second interdigital electrode lead-out part102cmay also be disposed in a different electrode layer from the second interdigital electrodes102a.

The embodiments of the present disclosure provide a method for manufacturing a surface acoustic wave resonator device, including: forming a first electrode material layer on a piezoelectric substrate, and patterning the first electrode material layer to form a first electrode layer including a plurality of first electrode patterns; forming a spanning structure to cover a portion of the first electrode layer; and forming a second electrode material layer on the piezoelectric substrate and the spanning structure, and patterning the second electrode material layer to form a second electrode layer including a plurality of second electrode patterns, wherein a portion of the second electrode layer and a portion of the first electrode layer overlap each other in a direction perpendicular to the piezoelectric substrate, and are electrically isolated from each other through the spanning structure. In some embodiments, forming the spanning structure includes forming a spanning material layer on the piezoelectric substrate on which the first electrode layer is formed, and performing a patterning process on the spanning material layer to form a spanning structure including a first spanning layer and a second spanning layer.

In some embodiments, the piezoelectric substrate may include a suitable piezoelectric material such as a piezoelectric crystal, a piezoelectric ceramic, or the like. For example, the material of the piezoelectric substrate may include aluminum nitride (AlN), doped aluminum nitride, zinc oxide (ZnO), lead zirconate titanate (PZT), lithium niobate (LiNbO3), quartz, potassium niobate (KNbO3), lithium tantalate (LiTaO3), the like or combinations thereof. In some embodiments, the piezoelectric substrate may be a single-layer structure or a multi-layer structure, such as a piezoelectric film composite structure, such as a composite structure of a lithium tantalate piezoelectric film/silicon dioxide/silicon substrate. However, the present disclosure is not limited thereto.

In some embodiments, the first electrode material layer and the second electrode material layer may be the same or different materials, and may each be selected from a metal or a metal alloy, for example, each may include gold, silver, tungsten, titanium, platinum, aluminum, copper, molybdenum, the like, alloys thereof or combinations thereof.

For example, in the method for manufacturing the surface acoustic wave resonator device500aillustrated inFIG.1AtoFIG.1Cand the surface acoustic wave resonator device500billustrated inFIG.2, the plurality of first electrode patterns of the first electrode layer E1may include one or more second interdigital electrodes102aand a second interdigital electrode connection part102b, and may further include a second interdigital electrode lead-out part102c; and the plurality of second electrode patterns of the second electrode layer E2may include one or more first interdigital electrodes101aand a first interdigital electrode connection part101b, and may further include a first interdigital electrode lead-out part101c.

For example, in the method for manufacturing the surface acoustic wave resonator device500cillustrated inFIG.3AtoFIG.3Cand the surface acoustic wave resonator device500dillustrated inFIG.4AtoFIG.4C, the plurality of first electrode patterns of the first electrode layer E1may include a first interdigital electrode connection part101band a second interdigital electrode connection part102b; and the plurality of second electrode patterns of the second electrode layer E2may include one or more first interdigital electrodes101aand one or more second interdigital electrodes102a, and may further include a first interdigital electrode lead-out part101cand a second interdigital electrode lead-out part102c.

For example, in the method for manufacturing the surface acoustic wave resonator device500eillustrated inFIG.5AtoFIG.5C, the plurality of first electrode patterns of the first electrode layer E1may include one or more first interdigital electrodes101aand one or more second interdigital electrodes102a, and may further include a first interdigital electrode lead-out part101cand a second interdigital electrode lead-out part102c; and the plurality of second electrode patterns of the second electrode layer E2may include a first interdigital electrode connection part101band a second interdigital electrode connection part102b.

For relevant features and technical effects of the surface acoustic wave resonator devices formed by the manufacturing methods of various embodiments, reference may be made to the content described above with respect toFIG.1AtoFIG.5B, which are not described again herein.

The embodiments of the present disclosure provide a filter, including any one or more of the above-mentioned surface acoustic wave resonator devices500ato500e, and the filter can achieve the technical effects identical to those described above with respect to the surface acoustic wave resonator devices.

In various embodiments of the present disclosure, through disposing two interdigital electrode connection parts in the two interdigital electrode end regions of the surface acoustic wave resonator device, and respectively connecting the two interdigital electrode connection parts to the corresponding interdigital electrodes, the two interdigital electrode connection parts can be used as clutter suppression structures to suppress transverse wave in spurious mode in the resonator device; in some embodiments, at least part of the clutter suppression structure is in direct contact with the piezoelectric substrate, thereby improving clutter suppression ability of the resonator device. Furthermore, compared to a conventional resonator device in which breakdown may be occurred at a high voltage due to the formation of an equivalent capacitance between the clutter suppression structure (e.g., including metal) and the plurality of interdigital electrodes, in the embodiments of the present disclosure, because each interdigital electrode connection part is electrically connected to part of the plurality of first and second interdigital electrodes, that is, has equivalent electrical potential with these interdigital electrodes, the possibility of occurring breakdown can be avoided or reduced. On the other hand, each interdigital electrode connection part is electrically isolated from another interdigital electrode through a spanning layer. In some examples, the spanning layer may be formed of a dielectric material having a high dielectric constant, thereby having good insulating ability and can also avoiding breakdown from being occurred. Therefore, through the above configuration, the clutter suppression ability of the clutter suppression structure in the resonator device can be improved, and the possibility of breakdown being occurred to the dielectric material between the clutter suppression structure and the interdigital electrodes can be avoided or reduced, thereby improving the reliability and device performance of the surface acoustic wave resonator device and the filter including the same.

The following statements should be noted: (1) the accompanying drawings related to the embodiment(s) of the present disclosure involve only the structure(s) in connection with the embodiment(s) of the present disclosure, and other structure(s) can be referred to common design(s); (2) in case of no conflict, features in one embodiment or in different embodiments of the present disclosure can be combined.

The above, are only specific embodiments of the present disclosure, but the scope of protection of the present disclosure is not limited thereto, and any variation or substitution readily conceivable by any person skilled in the art within the technical scope disclosed in the present disclosure shall be covered by the scope of protection of the present disclosure. Accordingly, the scope of protection of the present disclosure shall be defined by the scope of protection of the claims.