CN111555731B - Broadband surface acoustic wave filter for transmitting - Google Patents
Broadband surface acoustic wave filter for transmitting Download PDFInfo
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- CN111555731B CN111555731B CN202010386441.5A CN202010386441A CN111555731B CN 111555731 B CN111555731 B CN 111555731B CN 202010386441 A CN202010386441 A CN 202010386441A CN 111555731 B CN111555731 B CN 111555731B
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- cover plate
- sleeve
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- tear
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02818—Means for compensation or elimination of undesirable effects
- H03H9/02826—Means for compensation or elimination of undesirable effects of adherence
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Acoustics & Sound (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
The embodiment of the invention discloses a broadband surface acoustic wave filter for emission, which comprises a surrounding cover, wherein a substrate is arranged in the surrounding cover, plastic packaging glue connected with the inner wall of the surrounding cover is covered and installed on the outer side of the substrate, a mounting groove is formed in the surface of one side of the substrate, which is far away from the plastic packaging glue, a chip is installed on the inner wall of the mounting groove, a chute with a splayed cross section is formed in one side, which is far away from the plastic packaging glue, of the mounting groove.
Description
Technical Field
The embodiment of the invention relates to the field of filters, in particular to a wideband surface acoustic wave filter for transmitting.
Background
The acoustic surface filter is formed by evaporating a metal film on a material substrate having a piezoelectric effect, and then forming a pair of interdigital electrodes on each of both ends by photolithography. When a signal voltage is applied to the transmitting transducer, an electric field is formed between the input interdigital electrodes, so that the piezoelectric material generates mechanical vibration (namely ultrasonic waves) to propagate to the left and right sides in the form of ultrasonic waves, and the energy to one side of the edge is absorbed by the sound absorbing material. At the receiving end, the mechanical vibration is reconverted into an electrical signal by the receiving transducer and output by the interdigital electrode.
The conventional filters in the market at present need to ensure the sealing performance of the cavity at the filter chip, namely the functional area of the chip cannot contact any substance due to the product performance and design function requirements of the surface acoustic wave filter.
In the prior art, when equipment is assembled, devices are firstly manufactured on a ceramic substrate and then bonded with a chip, then the devices are embedded in the substrate, and finally a metal cover plate is installed, and most of the cover plates are sealed and fixed in a plastic package mode when being installed, but due to small equipment volume, the condition of the cover plates or the substrates cannot be intuitively judged due to large limitations when the equipment is assembled and sealed, and once the surfaces of the cover plates or the substrates are uneven or the cover plates or the substrates are not tightly bonded, colloid materials are extremely easy to overflow into a cavity from bonding gaps of the cover plates or the substrates if plastic package glue is filled, so that the normal use of the equipment is influenced.
Disclosure of Invention
Therefore, the embodiment of the invention provides a wideband surface acoustic wave filter for transmitting, which is used for solving the problem that in the prior art, once the surface of a cover plate or a substrate is uneven or the cover plate or the substrate is not tightly attached, if plastic packaging glue is filled, colloid materials are extremely easy to overflow into a cavity from an attaching gap between the cover plate and the substrate, so that the normal use of equipment is affected.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
the broadband surface acoustic wave filter for emission comprises a surrounding cover, wherein a substrate is arranged in the surrounding cover, plastic packaging glue connected with the inner wall of the surrounding cover is arranged on the outer side of the substrate in a covering mode, a mounting groove is formed in the surface of one side, far away from the plastic packaging glue, of the substrate, a chip is arranged on the inner wall of the mounting groove, a chute with the cross section in a splayed structure is formed in one side, far away from the plastic packaging glue, of the mounting groove, a metal electrode is arranged on the surface of the chip, a cover plate connected with the inner wall of the chute is arranged on one side, far away from the chip, of the metal electrode, and a sealing component is arranged between the cover plate and the substrate;
the sleeve seal assembly comprises a laminating ring piece arranged on the inner wall of the chute, a clamping groove is formed in the outer side wall of the base plate, a primary seal oblique sleeve is arranged on the surface of the laminating ring piece, an oblique sleeve caulking groove is formed in the position corresponding to the primary seal oblique sleeve on the surface of the cover plate, a sleeve hole is formed in the inner wall of the clamping groove, a sleeve caulking groove is formed in the position corresponding to the sleeve hole on the surface of the cover plate, a tight sleeve with the end extending to the sleeve caulking groove is connected in the sleeve hole, a close strip is arranged on the inner side wall of the sleeve caulking groove, and a close rubber sleeve connected with the close strip is sleeved on the side wall of the tight sleeve.
As a preferable scheme of the invention, the clinging strip consists of a clinging block connected to the inner side wall of the inserting sleeve caulking groove and a plurality of compressing blocks arranged on the surface of the clinging block, and the surface of the primary sealing oblique sleeve is provided with an arc-shaped anti-falling groove.
As a preferable scheme of the invention, the cross section of the tight sleeve is in a square structure, a pull block connected with the inner wall of the clamping groove is arranged in the tight sleeve, the pull block comprises a pressing pull piece arranged on the inner wall of the tight sleeve, a fixing piece with an L-shaped cross section is arranged at one end of the pressing pull piece far away from the tight sleeve, and the width of the fixing piece is larger than that of the pressing pull piece.
As a preferable scheme of the invention, the cover plate comprises a main cover plate connected with the chute, an auxiliary cover plate is arranged on the surface of one side of the main cover plate, which is far away from the base plate, a sealing cover plate is arranged on one side of the auxiliary cover plate, which is far away from the main cover plate, a compression ring is sleeved on the side wall of the auxiliary cover plate, and a compression piece connected with the fixing piece is arranged on the inner side wall of the compression ring.
As a preferable scheme of the invention, a plurality of stepped holes are formed in the cover plate, pin sleeves connected with the metal electrodes are arranged in the stepped holes, grooves are formed in the surface, close to the base plate, of the cover plate, connecting columns connected with the pin sleeves are arranged in the grooves, anti-tearing strips are arranged at two ends of each connecting column, a plurality of positioning tables are arranged at positions, corresponding to the anti-tearing strips, of the inner wall of each mounting groove, and hook tables used for hooking the positioning tables are arranged on the surfaces of the anti-tearing strips.
As a preferable scheme of the invention, the two ends of the anti-tear strip are provided with guide blocks on the surface of one side far away from the hooking platform, and the side wall of the guide block is provided with a plurality of ladder strips.
As a preferable scheme of the invention, the length values of the ladder bars are arranged in a linearly increasing trend from the side close to the tear bar to the side far from the tear bar.
As a preferred embodiment of the present invention, the tear strip and the two guide blocks are combined to form a U-shaped structure.
As a preferable mode of the invention, the length value of the tear strip is larger than that of the metal electrode.
Embodiments of the present invention have the following advantages:
according to the invention, the attached cover plate and the substrate can be sealed and fixed for the first time through the primary sealing inclined sleeve, even if gaps exist at the attached position of the cover plate and the substrate, the filled plastic sealing glue cannot easily permeate into the metal electrode area, and after the cover plate and the substrate are attached, the tight sleeve can be inserted into the sleeve hole, so that gaps cannot exist between the cover plate and the substrate, and the tightness of the cover plate and the substrate is improved;
the invention can also position the cover plate and the base plate through the tear-proof strip, so that the situation that the base plate on one side is expanded due to uneven filling of plastic packaging glue is prevented.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.
The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the invention, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present invention, should fall within the ambit of the technical disclosure.
FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present invention;
FIG. 2 is a view showing the appearance of a substrate according to an embodiment of the present invention;
FIG. 3 is an enlarged view of FIG. 1 at A;
FIG. 4 is a schematic side cross-sectional view of a cover plate according to an embodiment of the present invention;
fig. 5 is a bottom view of the tear strip attachment of the embodiment of the present invention.
In the figure:
1-a shroud; 2-a substrate; 3-plastic packaging glue; 4-chip; 5-metal electrodes; 6-cover plate; 7-sleeving and sealing the assembly; 8-clinging strips; 9-pulling blocks;
201-mounting slots; 202-chute; 203-a clamping groove; 204-a plug bush hole;
601-obliquely sleeving the caulking groove; 602-inserting sleeve caulking grooves; 603-a main cover plate; 604-a secondary cover plate; 605-cover plate; 606-a compression ring; 607-tabletting; 608-a stepped hole; 609-pin sleeve; 610-grooves; 611-a connection column; 612-tear-proof strip; 613-a positioning table; 614-hooking stand; 615-a boot block; 616-step bars;
701-fitting ring piece; 702-primary sealing of the inclined sleeve; 703-tight sleeve; 704, tightly attaching the rubber sleeve; 705-anti-drop groove;
801-sticking blocks; 802-compacting blocks;
901-pressing a pull tab; 902-fixing sheets.
Detailed Description
Other advantages and advantages of the present invention will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the present invention provides a wideband saw filter for transmitting, which can perform primary sealing fixation on a bonded cover plate 6 and a substrate 2 through a primary sealing oblique sleeve 702, and after the cover plate 6 is bonded with the substrate 2, a tight sleeve 703 can be inserted into a sleeve hole 204, so that no gap exists between the cover plate 6 and the substrate 2, thereby improving the tightness of the cover plate and the substrate; meanwhile, the cover plate 6 and the base plate 2 can be positioned through the anti-tearing strip 612, so that the situation that the plastic package glue 3 is unevenly filled to expand the base plate 2 on one side is prevented.
The filter comprises a housing 1, wherein a substrate 2 is arranged in the housing 1, plastic packaging glue 3 connected with the inner wall of the housing 1 is arranged on the outer side of the substrate 2 in a covering mode, a mounting groove 201 is formed in the surface of one side, far away from the plastic packaging glue 3, of the substrate 2, a chip 4 is arranged on the inner wall of the mounting groove 201, a chute 202 with a splayed cross section is formed in one side, far away from the plastic packaging glue 3, of the mounting groove 201, a metal electrode 5 is arranged on the surface of the chip 4, the metal electrode 5 and a common filter electrode on the market are composed of an extraction electrode and a transducer electrode, a cover plate 6 connected with the inner wall of the chute 202 is arranged on one side, far away from the chip 4, of the metal electrode 5, and a sheathing assembly 7 is arranged between the cover plate 6 and the substrate 2.
When the device is assembled, the chip 4 and the metal electrode 5 can be directly arranged in the mounting groove 201 on the substrate 2, then the cover plate 6 is attached to the substrate 2, meanwhile, the plastic packaging adhesive 3 is filled, and the plastic packaging adhesive 3 can be fixedly sealed and gap isolated through the sleeve sealing component 7 in the filling process.
As shown in fig. 1 and 3, the sheathing assembly 7 includes a bonding ring 701 mounted on the inner wall of the chute 202, a clamping groove 203 is formed on the outer side wall of the base plate 2, a primary sheathing oblique sleeve 702 is mounted on the surface of the bonding ring 701, an oblique sheathing caulking groove 601 is formed at the position corresponding to the primary sheathing oblique sleeve 702 on the surface of the cover plate 6, a sheathing hole 204 is formed on the inner wall of the clamping groove 203, a sheathing caulking groove 602 is formed at the position corresponding to the sheathing hole 204 on the surface of the cover plate 6, a tight sheathing 703 with an end extending into the sheathing caulking groove 602 is connected in the sheathing hole 204, a clinging strip 8 is mounted on the inner side wall of the sheathing caulking groove 602, and a clinging glue sleeve connected with the clinging strip 8 is sheathed on the side wall of the tight sheathing strip 704.
When the cover plate 6 is attached to the substrate 2, the primary sealing inclined sleeve 702 can be directly inserted into the inclined sleeve embedding groove 601 until the attaching ring 701 is attached to the surface of the cover plate 6 (because the surface of the primary sealing inclined sleeve 702 is provided with the arc-shaped anti-drop groove 705, the primary sealing inclined sleeve 702 inserted into the inclined sleeve embedding groove 601 cannot easily move, so that the substrate 2 cannot easily be expanded when the plastic sealing adhesive 3 is filled), the primary sealing effect is achieved, the plastic sealing adhesive 3 cannot easily infiltrate into the cavity area of the metal electrode 5 when the plastic sealing adhesive 3 is filled, then the tight sleeve 703 is inserted into the inserting hole 204 until the end part of the tight sleeve 703 is attached to the inner wall of the inserting groove 602, and the tight sleeve 703 is gradually pressed against the attaching strip 8 in the inserting process of the tight sleeve 704, so that a gap cannot easily occur between the cover plate 6 and the substrate 2.
The clinging strip 8 consists of a clinging block 801 connected to the inner side wall of the inserting sleeve caulking groove 602 and a plurality of compacting blocks 802 arranged on the surface of the clinging block 801.
When the close-fitting rubber sleeve 704 contacts the close-fitting pressing block 802, the close-fitting rubber sleeve 704 is compressed, so that the close-fitting rubber sleeve 703 can be gradually inserted, but the substrate 2 at the moment is driven to tightly press the cover plate 6, so that the joint between the cover plate 6 and the substrate 2 is tighter (even if a gap exists, the position between the cover plate 6 and the substrate 2 can be corrected and the gap can be sealed under the joint operation) (the close-fitting rubber sleeve 703 can be symmetrically arranged, and two or four can be arranged).
As shown in fig. 2, the cross section of the tight sleeve 703 is in a square shape, a pull block 9 connected with the inner wall of the clamping groove 203 is installed in the tight sleeve 703, the pull block 9 comprises a pressing pull piece 901 installed on the inner wall of the tight sleeve 703, a fixing piece 902 with an L-shaped cross section is installed at one end of the pressing pull piece 901 far away from the tight sleeve 703, and the width of the fixing piece 902 is larger than that of the pressing pull piece 901.
When the tight sleeve 703 is fixed, the pull block 9 can be inserted into the tight sleeve, and then the plastic sealing glue 3 is refilled, after the plastic sealing glue 3 is solidified, the tight sleeve 703 can be pressed by the fixing piece 902 to pull the pressing pull piece 901, so that the phenomenon of trembling or movement can not occur at the position of the tight sleeve 703, and the size of the fixing piece 902 is set so as to isolate the gap between the tight sleeve 703 and the inserting sleeve hole 204, so that the phenomenon of overflow of the plastic sealing glue 3 can not occur everywhere easily.
As shown in fig. 1 and 4, the cover plate 6 includes a main cover plate 603 connected with the chute 202, a sub-cover plate 604 is mounted on a surface of one side of the main cover plate 603 far away from the base plate 2, a cover plate 605 is mounted on one side of the sub-cover plate 604 far away from the main cover plate 603, a pressing ring 606 is sleeved on a side wall of the sub-cover plate 604, and a pressing piece 607 connected with a fixing piece 902 is mounted on an inner side wall of the pressing ring 606.
The cover plate 6 is designed to be fully fixed with the substrate 2, in the specific implementation, the main cover plate 603 is directly clamped into the chute 202 (the shape of the chute 202 is set so as to be compared with a lying surface, so that the sealing glue material cannot flow easily), the auxiliary cover plate 604 and the cover plate 605 are designed to have the step bearing function, in the finished product manufacturing, the metal material used by the conventional filter in the market can be selected, and the metal material is formed by turning and milling by a lathe, and after the cover plate 6 is fully attached with the substrate 2, the pressing ring 606 (such as fixed by spot welding) can be fixed on the auxiliary cover plate 604, so that the fixing piece 902 is pressed by the pressing piece 607 to facilitate the subsequent sealing glue filling operation.
As shown in fig. 4 and fig. 5, the cover plate 6 is provided with a plurality of stepped holes 608, a pin sleeve 609 connected with the metal electrode 5 is installed in the stepped holes 608, a groove 610 is formed in the surface of one side of the cover plate 6, which is close to the substrate 2, a connection column 611 connected with the pin sleeve 609 is installed in the groove 610, two ends of the connection column 611 are provided with anti-tear strips 612, a plurality of positioning tables 613 are installed at positions, corresponding to the anti-tear strips 612, of the inner wall of the installation groove 201, and a hooking table 614 used for hooking the positioning tables 613 is installed on the surface of the anti-tear strips 612.
The pin sleeve 609 should be provided with at least two pins, and then the pin sleeve 609 is filled with metal (the mode is not unique here, and is specifically adjusted according to the requirement) so as to obtain two pins, namely an input pin and an output pin.
When the cover plate 6 is attached to the substrate 2, the tear-preventing strips 612 can be directly inserted into the mounting groove 201 on the substrate 2 to perform a further sealing and fixing function, in the implementation, the tear-preventing strips 612 can slide along the inner wall of the mounting groove 201, then the hooking table 614 gradually hooks the positioning table 613, if a gap occurs when the cover plate 6 is attached to the substrate 2 (i.e. the number of the positioning tables 613 hooked by the two tear-preventing strips 612 is different), the positions of the cover plate 6 and the substrate 2 can be corrected when the compact sleeve 703 is subsequently inserted, so that the number of the positioning tables 613 hooked by the two tear-preventing strips 612 is the same, and the resealing function is achieved, so that when the sealing material is filled, even if the partial area is filled more, the substrate 2 cannot be easily expanded.
Both ends of the tear-proof strip 612 are provided with guide blocks 615 on the surface of one side far away from the hooking platform 614, and the side walls of the guide blocks 615 are provided with a plurality of step strips 616.
The sealing and seepage-proofing between the cover plate 6 and the base plate 2 are further improved, and when the plastic packaging material is permeated, the guiding and current-limiting effects can be performed through the plurality of step bars 616, so that the plastic packaging material cannot easily contact the electrode area.
The length values of the step strips 616 are linearly arranged in a gradually increasing manner from the side close to the tear strip 612 to the side far from the tear strip 612.
This is so arranged that the infiltrated molding compound eventually can only build up at the four corners of the substrate 2 without contacting the areas of the electrical cavities.
The tear-preventing strip 612 and the two guide blocks 615 form a U-shaped structure, and the length of the tear-preventing strip 612 is greater than that of the metal electrode 5.
This is provided to completely cover the metal electrode 5 to function as a secondary seal.
While the invention has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (9)
1. The utility model provides a broadband surface acoustic wave filter for transmission, its characterized in that includes enclosure (1) be provided with base plate (2) in enclosure (1), plastic envelope (3) with enclosure (1) inner wall connection are installed in the outside cover of base plate (2), just mounting groove (201) have been seted up to one side surface that plastic envelope (3) were kept away from to base plate (2), chip (4) are installed to the inner wall of mounting groove (201), just chute (202) that the cross-section personally submits the splayed structure have been seted up to mounting groove (201) in one side that keeps away from plastic envelope (3), the surface mounting of chip (4) has metal electrode (5), metal electrode (5) are equipped with apron (6) with chute (202) inner wall connection in one side that keeps away from chip (4) be equipped with between apron (6) and base plate (2) cover package assembly (7);
the cover seal assembly (7) comprises a laminating ring piece (701) arranged on the inner wall of the chute (202), a clamping groove (203) is formed in the outer side wall of the base plate (2), a primary seal inclined sleeve (702) is arranged on the surface of the laminating ring piece (701), an inclined sleeve embedding groove (601) is formed in the position, corresponding to the primary seal inclined sleeve (702), of the surface of the cover plate (6), a sleeve hole (204) is formed in the inner wall of the clamping groove (203), a sleeve embedding groove (602) is formed in the position, corresponding to the sleeve hole (204), of the surface of the cover plate (6), a tight sleeve (703) with the end part extending into the sleeve embedding groove (602) is connected in the sleeve hole (204), a close fitting strip (8) is arranged on the inner side wall of the sleeve embedding groove (602), and a close fitting rubber sleeve (704) connected with the close fitting strip (8) is sleeved on the side wall of the close fitting strip (703).
2. The wideband surface acoustic wave filter for transmitting according to claim 1, wherein the adhesion strip (8) is composed of an adhesion block (801) connected to the inner side wall of the insertion groove (602) and a plurality of compression blocks (802) mounted on the surface of the adhesion block (801), and the surface of the primary sealing groove (702) is provided with an arc-shaped anti-drop groove (705).
3. The wideband surface acoustic wave filter for transmitting according to claim 1, wherein the cross section of the tight sleeve (703) is in a square-shaped structure, a pull block (9) connected with the inner wall of the clamping groove (203) is installed in the tight sleeve (703), the pull block (9) comprises a push-pull tab (901) installed on the inner wall of the tight sleeve (703), a fixing piece (902) with an L-shaped cross section is installed at one end of the push-pull tab (901) far away from the tight sleeve (703), and the width of the fixing piece (902) is larger than that of the push-pull tab (901).
4. A wideband saw filter for launch according to claim 1, characterized in that the cover plate (6) comprises a main cover plate (603) connected with the chute (202), a sub cover plate (604) is mounted on the surface of one side of the main cover plate (603) far away from the base plate (2), a cover plate (605) is mounted on one side of the sub cover plate (604) far away from the main cover plate (603), a pressing ring (606) is sleeved on the side wall of the sub cover plate (604), and a pressing piece (607) connected with the fixing piece (902) is mounted on the inner side wall of the pressing ring (606).
5. The wideband surface acoustic wave filter for transmitting according to claim 1, wherein a plurality of stepped holes (608) are formed in the cover plate (6), pin sleeves (609) connected with the metal electrodes (5) are mounted in the stepped holes (608), grooves (610) are formed in the surfaces, close to the base plate (2), of the cover plate (6), connecting columns (611) connected with the pin sleeves (609) are mounted in the grooves (610), tear-preventing strips (612) are mounted at two ends of the connecting columns (611), a plurality of positioning tables (613) are mounted at positions, corresponding to the tear-preventing strips (612), of the inner wall of the mounting groove (201), and hooking tables (614) used for hooking the positioning tables (613) are mounted on the surfaces of the tear-preventing strips (612).
6. The surface acoustic wave filter for transmitting broadband according to claim 5, wherein both ends of the tear strip (612) are provided with guide blocks (615) on a surface of a side far from the hooking base (614), and a plurality of step strips (616) are provided on a side wall of the guide blocks (615).
7. The wideband saw filter for transmitting as defined in claim 6, wherein the values of the lengths of the plurality of step bars (616) are arranged in a linearly increasing trend from a side closer to the tear bar (612) to a side farther from the tear bar (612).
8. A wideband saw filter for launch according to claim 6 wherein said tear strip (612) is combined with two of said guide blocks (615) to form a u-shaped structure.
9. A transmitting broadband surface acoustic wave filter according to claim 5, characterized in that the length value of the tear strip (612) is larger than the length value of the metal electrode (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010386441.5A CN111555731B (en) | 2020-05-09 | 2020-05-09 | Broadband surface acoustic wave filter for transmitting |
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| CN202010386441.5A CN111555731B (en) | 2020-05-09 | 2020-05-09 | Broadband surface acoustic wave filter for transmitting |
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| CN111555731B true CN111555731B (en) | 2023-06-06 |
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| CN113992182B (en) * | 2021-12-28 | 2022-03-11 | 深圳新声半导体有限公司 | Bulk acoustic wave resonator with temperature compensation layer |
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