CN204906333U - Surface acoustic wave filter for wireless microphone - Google Patents
Surface acoustic wave filter for wireless microphone Download PDFInfo
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- CN204906333U CN204906333U CN201520708212.5U CN201520708212U CN204906333U CN 204906333 U CN204906333 U CN 204906333U CN 201520708212 U CN201520708212 U CN 201520708212U CN 204906333 U CN204906333 U CN 204906333U
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- acoustic wave
- surface acoustic
- wave filter
- wireless microphone
- base plate
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Abstract
The utility model discloses a surface acoustic wave filter for wireless microphone, including the PCB bottom plate that has pattern of electrode, set up sound surface wave filter chip on the PCB bottom plate, the chip has the fork ability transducer pattern of filtering function, surface acoustic wave filter includes still that the crown cap encapsulation is on the PCB bottom plate to seal the chip in the space of crown cap and PCB bottom plate constitution. Surface acoustic wave filter work 110MHz the near, also expanded to the 80 -200MHz vicinity. The utility model discloses current plug -in components product F12 (little panasonic) is compared to sound surface wave filter product, and its bulky range reduces, and the structure is succinct, and it is convenient to use, adopted automatic paster welding process simultaneously after, reduced traditional welding short circuit, electrostatic breakdown device scheduling problem, the reliability is high, overall with low costs, the practicality is strong. But its wide application has wide market prospect in intelligent house and the service industry of advertising media on smart machines such as wireless voice transmission.
Description
Technical field
The utility model relates to a kind of wireless microphone Surface Acoustic Wave Filter, belongs to wireless microphone radio circuit technical field.
Background technology
Surface acoustic wave techniques is widely used in signal transacting, comprises radiofrequency signal process and intermediate-frequency circuit signal transacting field.The band radiofrequency signal process that current wireless microphone circuit signal mainly adopts, tradition uses plug-in type F12(to be commonly called as little Panasonic) Surface Acoustic Wave Filter SAWF, volume is large, efficiency of assembling is low, reliability and consistency bad, along with microphone is miniaturized and circuit microminiaturization needs, Surface Acoustic Wave Filter is had higher requirement.
In existing wireless microphone circuit engineering, SAW (Surface Acoustic Wave) filter used comprises: 1,110MHz Broad-Band SAW Filters F11 package casing, product as best shown in figs. ia-ic, this product electrical property poor anti jamming capability, bandwidth, clutter easily occurs, circuit installs and uses complexity, and welding easily causes scolding tin short circuit, is difficult to the defects such as automation.2,110MHz narrow-band sound surface wave filter F12 package casing, be commonly called as little Panasonic, product as shown in Fig. 2 a-2b, frequency characteristic-three dB bandwidth 300KHz, narrow bandwidth, high interference and selectivity better, but its volume is large, circuit arrangement uses complicated, and welding easily causes scolding tin short circuit, do not meet circuit miniaturization, integrated requirement.
Summary of the invention
For deficiency of the prior art, main purpose of the present utility model is the wireless microphone Surface Acoustic Wave Filter providing a kind of Novel patch type, and it has, and volume is little, structure simple, application is convenient and low cost and other advantages.
In order to achieve the above object, the utility model adopts following technical scheme: a kind of wireless microphone Surface Acoustic Wave Filter, comprise the PCB base plate with electrode pattern, described PCB base plate is provided with SAW (Surface Acoustic Wave) filter chip, described chip has the fork energy transducer pattern of filter function, described Surface Acoustic Wave Filter also comprises crown cap and is encapsulated on PCB base plate, to be sealed in by chip in the space of crown cap and PCB base plate composition.
As further preferred, described PCB base plate is epoxy PCB base plate.
As further preferred, described Surface Acoustic Wave Filter is surface attaching type, instead of traditional little Panasonic of plug-in unit F12() type SAW (Surface Acoustic Wave) filter.
As further preferred, described PCB epoxy base plate has extraction electrode, the design of its circuit exit, and taken into account insert circuitry bond pad locations, replace convenient and swift, effect of parasitic capacitance is little.
As further preferred, the fork energy transducer pattern of described chip adopts Fourier transform integrated design, and is realized by semiconductor integrated circuit planar technique.
As further preferred, adopt packaging plastic to be sealed in by chip in the space of crown cap and PCB epoxy base plate composition, ensure that the reliability of device, described packaging plastic is arranged on the periphery of PCB base plate.
As further preferred, described crown cap surface adopts antirust coat process.
As further preferred, the operating frequency range of described Surface Acoustic Wave Filter is at 80-200MHz.
As further preferred, the characteristic operating frequency scope of described Surface Acoustic Wave Filter is at 110MHz.
As further preferred, the overall dimension of described Surface Acoustic Wave Filter is 10.0*4.2*1.8mm, and size is not affecting under circuit service condition and can slightly adjust.
The beneficial effects of the utility model are: the wireless microphone SAW (Surface Acoustic Wave) filter of the utility model patch-type, adopt the chip that the sound surface fork energy transducer architecture of Fourier transform design is realized by integrated circuit planar technique, package casing is crown cap and with extraction electrode epoxy PCB base plate, achieves excellent electrical property.Especially the design of circuit exit, taken into account plug-in unit electric power welding spot size, replace convenient and swift, effect of parasitic capacitance is little.The wireless microphone SAW (Surface Acoustic Wave) filter of the utility model patch-type, without exit pin, is accurately packaged in the braid of SMD standard type, is suitable for all automatic placement machines and beats soon, convenient and swift user automated production in enormous quantities.The utility model SAW (Surface Acoustic Wave) filter product compares the existing little Panasonic of plug-in unit product F 12(), its volume significantly reduces, and it is simple for structure, application is convenient, after have employed automatic chip mounting welding procedure, reduces traditional welding short circuit simultaneously, the problems such as electrostatic breakdown device, reliability is high, and overall cost is low, practical.The utility model SAW (Surface Acoustic Wave) filter product uses environmental protection low carbon materials, free from environmental pollution, cost low economic value is high, and its miniaturized profile can be widely used on wireless microphone system, other radio circuit voice transfer smart machine, has wide market prospects.
Accompanying drawing explanation
Fig. 1 a-1c is the structural representation of existing wireless microphone 110MHz broadband SAW (Surface Acoustic Wave) filter F11.
Fig. 2 a-2b is the structural representation (being commonly called as little Panasonic) of existing wireless microphone 110MHz arrowband SAW (Surface Acoustic Wave) filter F12.
Fig. 3 a-3c is the appearance structure schematic diagram of the utility model embodiment 1 wireless microphone Surface Acoustic Wave Filter.
Fig. 4 a is the decomposition texture schematic diagram of the utility model embodiment 2 wireless microphone Surface Acoustic Wave Filter.
Fig. 4 b is the finished product structure schematic diagram of the utility model embodiment 2 wireless microphone Surface Acoustic Wave Filter.
Fig. 5 is the frequency characteristic test schematic diagram of the utility model embodiment wireless microphone Surface Acoustic Wave Filter.
Fig. 6 is the frequency characteristic schematic diagram of the utility model embodiment wireless microphone Surface Acoustic Wave Filter.
What mark in accompanying drawing is described as follows: 1-crown cap, 2-IDT chip, 3-epoxy PCB base plate, 4-packaging plastic.
Embodiment
The realization of the utility model object, functional characteristics and beneficial effect, be described further below in conjunction with specific embodiment and accompanying drawing.
Below in conjunction with the drawings and specific embodiments, technical scheme described in the utility model is described in further detail, to make those skilled in the art better can understand the utility model being implemented, but illustrated embodiment is not as to restriction of the present utility model.
Fig. 1 a-1c illustrates the schematic diagram of each side of existing wireless microphone 110MHz broadband SAW (Surface Acoustic Wave) filter F11 structure, and it is with pin configuration, and overall dimension L*W*H is 11.0*4.6*8.3mm.
Fig. 2 a-2b illustrates the schematic diagram (being commonly called as little Panasonic) of each side of existing wireless microphone 110MHz arrowband SAW (Surface Acoustic Wave) filter F12 structure, and it is equally with pin configuration, and overall dimension L*W*H is 12.2*7.4*7.5mm.
Fig. 3 a-3c illustrates the schematic diagram of each side of the appearance structure of the utility model embodiment 1 wireless microphone Surface Acoustic Wave Filter, and it is without exit pin, and overall dimension L*W*H is 10.0*4.2*1.8mm.
Fig. 4 a is the decomposition texture schematic diagram of the utility model embodiment 2 wireless microphone Surface Acoustic Wave Filter, shown wireless microphone Surface Acoustic Wave Filter comprises the crown cap 1 of antirust coat process, the chip 2 pitched energy transducer architecture IDT with the sound surface that Fourier changes the micron order lines of design, realized by semiconductor integrated circuit planar technique of integrated design, temperature coefficient is little, electric performance stablity during work is affected by environment little.It takes the epoxy PCB base plate 3 of extraction electrode out of, has excellent dielectric constant, and high-temperature-resistant lead-free confluxes weldering, the especially design of signal output electrode, and taken into account insert circuitry welding spot size, replace convenient and swift, effect of parasitic capacitance is little.
The utility model embodiment 2 is alignment unification in clean environment, achieves the accurate assembling of three, and required artificial few, bulk article production efficiency is high.Quality conformance is good, is all positioned at screening arrangement, has stronger antijamming capability.
Claims (10)
1. a wireless microphone Surface Acoustic Wave Filter, it is characterized in that: comprise the PCB base plate with electrode pattern, described PCB base plate is provided with SAW (Surface Acoustic Wave) filter chip, described chip has the fork energy transducer pattern of filter function, described Surface Acoustic Wave Filter also comprises crown cap and is encapsulated on PCB base plate, to be sealed in by chip in the space of crown cap and PCB base plate composition.
2. wireless microphone Surface Acoustic Wave Filter according to claim 1, is characterized in that: described PCB base plate is epoxy PCB base plate.
3. wireless microphone Surface Acoustic Wave Filter according to claim 1, is characterized in that: described Surface Acoustic Wave Filter is surface attaching type.
4. wireless microphone Surface Acoustic Wave Filter according to claim 1, is characterized in that: described PCB epoxy base plate has extraction electrode.
5. wireless microphone Surface Acoustic Wave Filter according to claim 1, is characterized in that: described fork can adopt Fourier transform integrated design by transducer pattern.
6. wireless microphone Surface Acoustic Wave Filter according to claim 1, is characterized in that: adopt packaging plastic to be sealed in by chip in the space of crown cap and PCB epoxy base plate composition, described packaging plastic is arranged on the periphery of PCB base plate.
7. wireless microphone Surface Acoustic Wave Filter according to claim 1, is characterized in that: described crown cap surface is provided with antirust coat.
8. wireless microphone Surface Acoustic Wave Filter according to claim 1, is characterized in that: the operating frequency range of described Surface Acoustic Wave Filter is at 80-200MHz.
9. wireless microphone Surface Acoustic Wave Filter according to claim 8, is characterized in that: the characteristic operating frequency scope of described Surface Acoustic Wave Filter is at 110MHz.
10. wireless microphone Surface Acoustic Wave Filter according to claim 1, is characterized in that: the overall dimension of described Surface Acoustic Wave Filter is 10.0*4.2*1.8mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520708212.5U CN204906333U (en) | 2015-09-14 | 2015-09-14 | Surface acoustic wave filter for wireless microphone |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520708212.5U CN204906333U (en) | 2015-09-14 | 2015-09-14 | Surface acoustic wave filter for wireless microphone |
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| Publication Number | Publication Date |
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| CN204906333U true CN204906333U (en) | 2015-12-23 |
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| CN201520708212.5U Active CN204906333U (en) | 2015-09-14 | 2015-09-14 | Surface acoustic wave filter for wireless microphone |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071783A (en) * | 2015-09-14 | 2015-11-18 | 德清兰德电子有限公司 | Surface acoustic wave filter for wireless microphone |
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- 2015-09-14 CN CN201520708212.5U patent/CN204906333U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071783A (en) * | 2015-09-14 | 2015-11-18 | 德清兰德电子有限公司 | Surface acoustic wave filter for wireless microphone |
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