Small dual-passband surface acoustic wave filtering anti-interference enhancement structure

Abstract

The utility model relates to the technical field of dual-passband surface acoustic wave filters, in particular to a small-sized dual-passband surface acoustic wave filtering anti-interference enhancing structure, which comprises a dual-passband surface acoustic wave filter body, a substrate is arranged on the dual-passband surface acoustic wave filter body, an electromagnetic shielding net is arranged in the substrate, a shielding ring is arranged on the periphery of the top end of the substrate, and the shielding ring is arranged on the top end of the substrate. According to the structure, the electromagnetic shielding net is arranged in the substrate, and the shielding ring and the arched shielding cover are combined to form a multi-angle surrounding electromagnetic shielding system, so that external radiation interference can be effectively inhibited, external interference can be reflected, and the electromagnetic shielding effect is improved. And electromagnetic noise entering the filter from different directions can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to double passband acoustic surface filter technical field, concretely is a kind of small double passband acoustic surface filter anti-interference enhancement structure. BACKGROUND

[0002] It is known that in modern wireless communication system, surface acoustic wave (SAW) filter is widely used due to its small size, stable performance and low insertion loss, with the continuous expansion and complexification of communication frequency band, traditional single passband SAW filter is difficult to meet the demand of multi-band signal processing, therefore, double passband SAW filter gradually becomes a research hotspot, however, in complex electromagnetic environment, external radiation interference can adversely affect the work of filter, leading to signal distortion or transmission efficiency reduction, shielding measures in traditional design often ignore edge effect, which can lead to signal leakage, especially more significant when operating at high frequency band, therefore, it is necessary to propose a solution to this technical problem. SUMMARY

[0003] (1) technical problem solved

[0004] In view of the deficiencies in the prior art, the utility model provides a small double passband acoustic surface filter anti-interference enhancement structure.

[0005] (2) technical scheme

[0006] To achieve the above object, the utility model provides the following technical scheme: a small double passband acoustic surface filter anti-interference enhancement structure, including double passband acoustic surface filter body, double passband acoustic surface filter body is equipped with substrate, the inside of substrate is equipped with electromagnetic shield net, the top of substrate is equipped with shield ring around, the shield ring is equipped with arc-shaped shield cover, the substrate is equipped with grounding mechanism.

[0007] Further, the utility model improves, one end of shield ring is provided with slot, the inner wall of shield ring is provided with sliding slot on both sides, sliding block is equipped between arc-shaped shield cover and sliding slot.

[0008] Further, the utility model improves, and the grounding mechanism includes screw groove and ground wire, the screw groove is opened in the substrate, the ground wire is equipped with grounding end between the screw groove, the screw groove is equipped with screw ring, the inner wall bottom of screw ring is equipped with elastic rubber ring, the screw ring is equipped with locking mechanism between arc-shaped shield cover.

[0009] Further, the utility model improves, and the locking mechanism includes sector plate and sector slot, the sector slot is opened in one end of arc-shaped shield cover, the sector plate is installed at the top of screw ring, the sector plate is equipped with multiple and annular array arrangement.

[0010] Further, the electromagnetic shielding net is a copper-nickel alloy grid.

[0011] Further, the arched shielding cover is made of copper alloy material.

[0012] Further, the outer surfaces of the shielding ring and the arched shielding cover are coated with a wave-absorbing layer.

[0013] (Three) beneficial effects

[0014] Compared with the prior art, the utility model provides a kind of small double-passband acoustic surface filter anti-interference enhancement structure, with following beneficial effects:

[0015] The small double-passband acoustic surface filter anti-interference enhancement structure, by setting electromagnetic shielding net inside substrate, and combining shielding ring and arched shielding cover form multi-angle surrounding electromagnetic shielding system, can effectively suppress external radiation interference, not only can reflect external interference, but also can reduce electromagnetic noise from different directions into filter interior, the design of arched shielding cover meets Snell law, so that it can more effectively reflect external radiation interference, provide additional protective layer, ensure the quality of signal transmission, the use of shielding ring is especially helpful to suppress edge leakage, this is particularly important for improving performance when operating in high frequency band, grounding mechanism establishes a low impedance grounding loop, ensures the potential consistency in shielding system, reduces the common mode interference risk in system, because the reduction of potential difference means less stray current path, to improve the stability and reliability of system. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 For the structure of the utility model Figure 1 ;

[0017] Figure 2 For the structure of the utility model Figure 2 ;

[0018] Figure 3 For the structure of the utility model is front view half sectional view;

[0019] Figure 4 For the structure of the utility model is top view half sectional view.

[0020] In the figure: 1, double-passband acoustic surface filter body;2, substrate;3, electromagnetic shielding net;4, shielding ring;5, arched shielding cover;6, sliding slot;7, sliding block;8, grounding wire;9, grounding end;10, threaded ring;11, elastic rubber ring;12, sector plate;13, sector slot. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0022] Please refer to Figures 1-4 The utility model discloses a small -size dual passband acoustic table filter anti -interference enhancement structure, including dual passband acoustic table filter body 1, be equipped with base plate 2 on dual passband acoustic table filter body 1, the inside of base plate 2 is equipped with electromagnetic shield net 3, the top around of base plate 2 is equipped with shield ring 4, be equipped with arc screen cover 5 on shield ring 4, be equipped with grounding mechanism on base plate 2, in this embodiment, the grounding mechanism on base plate 2 makes electromagnetic shield net 3, shield ring 4 and arc screen cover 5 on base plate 2 connect ground wire 8 road, through electromagnetic shield net 3, shield ring 4 and arc screen cover 5 form multi -angle encircling electromagnetic shield system, to suppress external radiation interference, arc screen cover 5 to reflect external radiation interference, meet Snell law, shield ring 4 inhibits edge leakage, through annular shield cover setting on shield ring 4, can ensure electromagnetic continuity, electromagnetic shield net 3 through the skin effect reflects high frequency electromagnetic wave, reduces the induced current in base plate 2, grounding structure establishes low impedance grounding loop, ensures that the shielding system potential consistency, grounding network reduces system potential difference, reduces common mode interference risk, to realize the anti -interference effect of dual passband acoustic table filter body 1, possess anti -interference enhancement function.

[0023] In order to facilitate the assembly of the arc-shaped shielding cover 5, a slot is formed at one end of the shielding ring 4, and sliding grooves 6 are formed on the inner walls of the shielding ring 4. A sliding block 7 is arranged between the arc-shaped shielding cover 5 and the sliding grooves 6. The sliding block 7 is inserted into the sliding grooves 6, so that the arc-shaped shielding cover 5 can be assembled on the shielding ring 4.

[0024] In order to facilitate the assembly of the grounding mechanism, the grounding mechanism includes a threaded groove and a grounding wire 8. The threaded groove is formed on the base plate 2. A grounding end 9 is arranged between the grounding wire 8 and the threaded groove. A threaded ring 10 is arranged on the threaded groove. An elastic rubber ring 11 is arranged at the bottom of the inner wall of the threaded ring 10. A locking mechanism is arranged between the threaded ring 10 and the arc-shaped shielding cover 5. The grounding end 9 of the grounding wire 8 is pressed on the threaded groove. At this time, the grounding end 9 is in contact with the electromagnetic shield net 3. Then, the threaded ring 10 is screwed with the threaded groove through the grounding wire 8, so that the elastic rubber ring 11 exerts an elastic supporting force on the grounding end 9, ensuring that the grounding end 9 is stably assembled.

[0025] In order to facilitate the arch-shaped shielding cover 5 is fixed on the shielding ring 4, in the scheme, the locking mechanism includes the sector plate 12 and the sector slot 13, the sector slot 13 is opened in one end of the arch-shaped shielding cover 5, the sector plate 12 is installed at the top end of the threaded ring 10, the sector plate 12 is provided with multiple and annular array, when the threaded ring 10 is rotated and tightened in the threaded slot, the arch-shaped shielding cover 5 is pushed by the sliding block 7 and abuts against one end of the sliding groove 6, at this time, one of the multiple sector plates 12 is close to and aligned with the sector slot 13, continue to rotate the threaded ring 10, the sector plate 12 can be locked in the sector slot 13, thereby locking the arch-shaped shielding cover 5, through the elastic rubber ring 11, the fastening of the butt joint end 9 can still be maintained when being tightened.

[0026] In order to improve the shielding effect of the electromagnetic shielding net 3, in the scheme, the electromagnetic shielding net 3 is a copper-nickel alloy grid, and the copper-nickel alloy can efficiently reflect 5G frequency band electromagnetic waves.

[0027] In order to improve the shielding effect of the arch-shaped shielding cover 5, in the scheme, the arch-shaped shielding cover 5 is made of copper alloy material, has the characteristics of light weight, and ensures high-frequency electromagnetic wave reflectivity.

[0028] In order to further improve the overall anti-interference performance, in the scheme, the outer surfaces of the shielding ring 4 and the arch-shaped shielding cover 5 are coated with a wave-absorbing layer, the wave-absorbing layer is a ferrite-carbon nanotube composite material, and the stray waves in the absorption band are absorbed through the synergistic effect of dielectric loss and magnetic loss.

[0029] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A compact dual-passband acoustic surface filter anti-jam enhancement structure comprising a dual-passband acoustic surface filter body (1), characterized in that, The double-passband acoustic filter body (1) is provided with a base plate (2), the inside of the base plate (2) is provided with an electromagnetic shielding net (3), the top end of the base plate (2) is provided with a shielding ring (4), the shielding ring (4) is provided with an arched shielding cover (5), and the base plate (2) is provided with a grounding mechanism.

2. A compact dual-passband acoustic resonator filter anti-jam enhancement structure according to claim 1, wherein, One end of the shielding ring (4) is provided with a slot, and the inner wall of the shielding ring (4) is provided with a sliding groove (6) on both sides; the arched shielding cover (5) and the sliding groove (6) are provided with a sliding block (7).

3. A compact dual-passband acoustic resonator filter anti-jam enhancement structure according to claim 2, wherein, The grounding mechanism comprises a threaded groove and a grounding wire (8), the threaded groove is arranged on the base plate (2), the grounding wire (8) and the threaded groove are provided with a grounding end (9), the threaded groove is provided with a threaded ring (10), the inner wall bottom end of the threaded ring (10) is provided with an elastic rubber ring (11), and the threaded ring (10) and the arched shielding cover (5) are provided with a locking mechanism.

4. A compact dual-passband acoustic resonator filter anti-jam enhancement structure according to claim 3, wherein, The locking mechanism comprises a sector plate (12) and a sector groove (13), the sector groove (13) is arranged at one end of the arched shielding cover (5), the sector plate (12) is installed at the top end of the threaded ring (10), and the sector plate (12) is provided with a plurality of annular arrays.

5. A compact dual-passband acoustic resonator filter anti-jam enhancement structure according to claim 1, wherein, The electromagnetic shielding net (3) is a copper-nickel alloy grid.

6. A compact dual-passband acoustic resonator filter anti-jam enhancement structure according to claim 1, wherein, The arched shielding cover (5) is made of copper alloy material.

7. A compact dual-passband acoustic resonator filter anti-jam enhancement structure according to claim 1, wherein The outer surfaces of the shielding ring (4) and the arched shielding cover (5) are coated with a wave-absorbing layer.

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