CN217883380U - LC receiving intermediate frequency filter - Google Patents
LC receiving intermediate frequency filter Download PDFInfo
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- CN217883380U CN217883380U CN202221153570.0U CN202221153570U CN217883380U CN 217883380 U CN217883380 U CN 217883380U CN 202221153570 U CN202221153570 U CN 202221153570U CN 217883380 U CN217883380 U CN 217883380U
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Abstract
The utility model provides a LC receives intermediate frequency filter. The LC receiver intermediate frequency filter includes: the top of the shell is provided with a cover plate; the printed board is arranged inside the shell, and seven chip ferrite wound inductors and seven first-class chip multilayer ceramic dielectric capacitors are arranged on the printed board; an input pin mounted at a bottom of the housing. The utility model provides a LC receives intermediate frequency filter, the whole equipment back of wave filter has smallly: the inductor is a ferrite winding inductor packaged by a chip 0603, and the capacitor is packaged by a chip 0402, so that the miniaturization design is met; the use is flexible: when the circuit layout is printed, the space can be fully utilized, and the density of components is improved; the structure is simple: the design uses few devices and is a conventional device, and the structure mode is simple.
Description
Technical Field
The utility model relates to a radio frequency communication circuit technical field especially relates to a LC receives intermediate frequency filter.
Background
With the continuous development of society, the demand for communication is continuously increased, and in the communication process, in order to implement filtering processing on a communication broadband, a filter device is used to assist the stable operation and signal transmission of a wireless communication system.
The filter is of great importance in wireless communication systems, and plays a role in selecting frequency bands and channels, and can filter out harmonic suppression spurs. The spread spectrum communication broadband of a certain radio station is 2.5MHz, the intermediate frequency generated by down-conversion of a receiving channel is 10.7HMz, and an intermediate frequency filter is required to be added for filtering before demodulation of a digital unit.
In the prior art, all the selected intermediate-frequency 10.7MHz broadband filters are connectors, as shown in figure 1, an inductor inside the filter adopts a magnetic ring winding mode, and the filter has the advantages of small in-band fluctuation of the filter, but has the defects of large size and weight of the connectors and incapability of meeting the miniaturization design requirement of a radio station.
Therefore, it is necessary to provide an LC receiver if filter to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
The utility model provides a LC receives intermediate frequency filter has solved the problem that the wave filter volume remains further compression.
In order to solve the technical problem, the utility model provides a LC receives intermediate frequency filter, include: the top of the shell is provided with a cover plate; the printed board is arranged inside the shell, and seven chip ferrite wound inductors and seven first-class chip multilayer ceramic dielectric capacitors are arranged on the printed board; the input pin is arranged at the bottom of the shell, and the output end of the input pin is connected with the input end of the printed board; and the output pin is arranged at the bottom of the shell, and the input end of the output pin is connected with the output end of the printed plate.
Preferably, the seven chip ferrite wire-wound inductors comprise 3L4, 3L5, 3L6, 3L7, 3L8, 3L9 and 3L10.
Preferably, seven of the chip multilayer ceramic dielectric capacitors comprise 3C32, 3C33, 3C34, 3C35, 3C37, 3C38, 3C39.
Preferably, the chip ferrite wire-wound inductor is a chip 0603 packaged ferrite wire-wound inductor.
Preferably, the chip type multilayer ceramic dielectric capacitor adopts a chip type 0402 packaged multilayer ceramic dielectric capacitor.
Preferably, the bottom of the shell is provided with a groove, the outer surface of the shell is provided with a connecting groove, the shell is provided with a through hole, and the bottom of the shell is provided with an isolation screen plate.
Preferably, the surface of the groove is a concave cambered surface structure, and the inside of the groove is communicated with the inside of the connecting groove.
Preferably, the inside of the through hole and the inside of the groove are distributed in a criss-cross manner, the isolation screen plate is arranged right below the groove, and the isolation screen plate is made of a heat dissipation plate.
Compared with the prior art, the utility model provides a LC receives intermediate frequency filter has following beneficial effect:
the utility model provides a LC receives intermediate frequency filter, the whole equipment back of wave filter has smallly: the inductor is a ferrite wound inductor packaged by a chip 0603, and the capacitor is packaged by a chip 0402, so that the miniaturization design is met; the use is flexible: when the circuit layout is printed, the space can be fully utilized, and the density of components is improved; the structure is simple: the design uses few devices and is a conventional device, and the structure mode is simple.
Drawings
FIG. 1 is a prior art filter structure;
fig. 2 is a three-dimensional diagram of a first embodiment of an LC receiving intermediate frequency filter provided by the present invention;
FIG. 3 is a filter layout configuration of the printed board shown in FIG. 2;
fig. 4 is a schematic diagram of an LC receiving intermediate frequency filter provided by the present invention;
fig. 5 is a simulation structure of an LC receiving intermediate frequency filter provided by the present invention;
fig. 6 is a three-dimensional view of a second embodiment of an LC receiving intermediate frequency filter provided by the present invention;
fig. 7 is a schematic view of the structure of fig. 6 with the spacer screen removed.
The reference numbers in the figures:
1. the device comprises a shell, 11, a cover plate, 101, grooves, 102, connecting grooves, 103 and through holes;
2. printing a plate;
3. inputting a pin;
4. an output pin;
5. and (5) isolating the net plate.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and embodiments.
The first embodiment:
please refer to fig. 1, fig. 2, fig. 3, fig. 4, and fig. 5, which show a filter structure of the prior art; fig. 2 is a three-dimensional view of a first embodiment of an LC receiving intermediate frequency filter provided by the present invention; FIG. 3 is a filter layout configuration of the printed board shown in FIG. 2; fig. 4 is a schematic diagram of an LC receiving intermediate frequency filter provided by the present invention; fig. 5 is a simulation structure of an LC receiving intermediate frequency filter provided by the present invention.
An LC receiver intermediate frequency filter comprising: the device comprises a shell 1, wherein a cover plate 11 is arranged at the top of the shell 1; the printed board 2 is mounted inside the shell 1, and seven chip ferrite wound inductors and seven chip multilayer ceramic dielectric capacitors of the same type are mounted on the printed board 2; the input pin 3 is mounted at the bottom of the shell 1, and the output end of the input pin 3 is connected to the input end of the printed board 2; and the output pin 4 is arranged at the bottom of the shell 1, and the input end of the output pin 4 is connected to the output end of the printed board 2.
As shown in fig. 2, fig. 3 and fig. 4, the filter adopts a five-order LC elliptic filter, which mainly comprises seven chip ferrite wire-wound inductors and seven first-class chip multilayer ceramic dielectric capacitors, and the schematic diagram is shown in fig. 4.
Seven of the chip ferrite wire wound inductors include 3L4, 3L5, 3L6, 3L7, 3L8, 3L9, 3L10.
Seven of the chip multilayer ceramic dielectric capacitors of this type include 3C32, 3C33, 3C34, 3C35, 3C37, 3C38, 3C39.
The connection distribution between the inductor and the capacitor completes the installation and connection of the components of the filter according to the connection principle shown in fig. 4.
The chip ferrite winding inductor is a chip 0603 packaged ferrite winding inductor.
The chip type multilayer ceramic dielectric capacitor adopts a chip type 0402 packaged multilayer ceramic dielectric capacitor.
The main performance indexes of the 10.7MHz broadband filter are as follows:
a) Center frequency: 10.7MHz;
b) 3dB bandwidth: not less than 2.5MHz;
c) Insertion loss: less than or equal to 3dB;
d) Fluctuation in band: less than or equal to 2dB;
e) Out-of-band suppression: not less than 40dB;
f) Input/output impedance: 330 Ω.
The inductor and capacitor are chosen to be at the respective nominal values and the filter simulation results are shown in figure 5.
The filter has small volume after being integrally assembled: the inductor is a ferrite winding inductor packaged by a chip 0603, and the capacitor is packaged by a chip 0402, so that the miniaturization design is met; the use is flexible: when the circuit layout is printed, the space can be fully utilized, and the density of components is improved; the structure is simple: the design uses few devices and is a conventional device, and the structure mode is simple.
The lumped LC elliptic filter is adopted, so that the lumped LC elliptic filter is small in size, convenient to install and free of parasitic pass band, and the space can be flexibly utilized for typesetting when the PCB is wired.
In the inductor type selection process, the nominal values of 3L7 inductors and 3L10 inductors in simulation results are larger, so that the inductor selects FW series chip ferrite wound inductors which have the characteristics of low direct-current resistance and large current, and can realize larger inductance in 0603 packaging, the capacitor selects CC41 type chip multilayer ceramic dielectric capacitors, and the corresponding nominal values can be selected in 0402 packaging.
According to a schematic diagram, the components are led into the PCB, typesetting is shown in figure 3, and the positions of the components can be adjusted according to actual space in the using process.
And after the printed board is manufactured, assembling components according to the simulation result, measuring S parameters by using a vector network analyzer, and finely adjusting the components until the requirements are met according to the frequency range of 10.7MHz +/-2.5 MHz if the S parameters meet the indexes of the broadband filter.
The selected devices are packaged by patches, filtering of receiving medium-frequency 10.7MHz broadband signals is completed, the defects of the existing filter are overcome, a receiving filter circuit is optimized, the space size of a printed board is saved, and a foundation is provided for miniaturization of a radio station.
The components selected by the filter are common components, and materials are convenient to obtain.
The utility model provides a LC receives intermediate frequency filter's theory of operation as follows:
according to a schematic diagram, the components are led into the PCB, typesetting is shown in figure 3, and the positions of the components can be adjusted according to actual space in the using process.
After the printed board is manufactured, components are assembled according to a simulation result, a vector network analyzer is used for measuring S parameters, the indexes of the broadband filter are met according to the frequency range of 10.7MHz +/-2.5 MHz, and otherwise, fine adjustment of the components is carried out until the requirements are met.
Compared with the prior art, the utility model provides a LC receives intermediate frequency filter has following beneficial effect:
the filter has small volume after being integrally assembled: the inductor is a ferrite wound inductor packaged by a chip 0603, and the capacitor is packaged by a chip 0402, so that the miniaturization design is met; the use is flexible: when the circuit layout is printed, the space can be fully utilized, and the density of components is improved; the structure is simple: the design uses few devices and is a conventional device, and the structure mode is simple.
Second embodiment:
referring to fig. 6 and 7, a second embodiment of the present application provides another LC receiver if filter based on the LC receiver if filter provided in the first embodiment of the present application. The second embodiment is only the preferred mode of the first embodiment, and the implementation of the second embodiment does not affect the implementation of the first embodiment alone.
Specifically, the LC receiver if filter provided in the second embodiment of the present application is different in that the LC receiver if filter further includes:
the bottom of the shell 1 is provided with a groove 101, the outer surface of the shell 1 is provided with a connecting groove 102, the shell 1 is provided with a through hole 103, and the bottom of the shell 1 is provided with an isolation screen plate 5.
Offer the cambered surface hollow out construction of recess 101 in the bottom of casing 1, cooperation connecting groove 102 can the holistic weight of effectual reduction casing 1, increases surface and external area of contact for radiating efficiency and quality when equipment operation make things convenient for the circulation and the drainage of air, strengthen the radiating quality of operation in-process.
The surface of the groove 101 is a concave arc structure, and the inside of the groove 101 and the inside of the connecting groove 102 are communicated with each other.
The inner part of the through hole 103 and the inner part of the groove 101 are distributed in a criss-cross manner, the isolation screen plate 5 is arranged right below the groove 101, and the isolation screen plate 5 is made of a heat dissipation plate.
The inside of through-hole 103 and the inside intercommunication of recess 101, through-hole 103 conveniently circulates the inside air of recess 101 from the side of casing 1, increases the radiating comprehensiveness in casing 1 surface.
The isolating screen plate 5 is made of a heat-conducting and heat-dissipating plate, can be a copper mesh or a stainless steel mesh, preferably a stainless steel mesh, is low in cost and good in heat-conducting and heat-dissipating performance, and is convenient for transferring heat generated in the operation process of the filter and quickening heat dissipation;
meanwhile, the isolation screen plate 5 can protect the lower part of the groove 101, so that the circulation and the input of dust are reduced, and the service life of equipment is prolonged.
The utility model provides a principle of second embodiment as follows:
the contact area between the ventilation and the heat dissipation and the outside is increased conveniently through the concave groove 101, the connecting groove 102 and the through hole 103;
the isolation screen plate 5 is arranged under the groove 101, so that the protection of the lower part of the groove 101 is realized, and dust is reduced to be attached to the inside of the groove 101, so that the ventilation inside the groove 101 is more stable and reliable.
The utility model provides a beneficial effect of second embodiment as follows:
offer the cambered surface hollow out construction of recess 101 in the bottom of casing 1, cooperation connecting groove 102 can the holistic weight of effectual reduction casing 1, increases surface and external area of contact for radiating efficiency and quality when equipment operation make things convenient for the circulation and the drainage of air, strengthen the radiating quality of operation in-process.
The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes of the present invention are used in the specification and the attached drawings, or directly or indirectly applied to other related technical fields, and the same principle is included in the protection scope of the present invention.
Claims (8)
1. An LC receiver intermediate frequency filter, comprising:
the top of the shell is provided with a cover plate;
the printed board is arranged in the shell, and seven chip ferrite wound inductors and seven first-class chip multilayer ceramic dielectric capacitors are arranged on the printed board;
the input pin is arranged at the bottom of the shell, and the output end of the input pin is connected with the input end of the printed board;
and the output pin is arranged at the bottom of the shell, and the input end of the output pin is connected with the output end of the printed plate.
2. The LC receiver IF filter of claim 1, wherein seven of said chip ferrite wire wound inductors comprise 3L4, 3L5, 3L6, 3L7, 3L8, 3L9, 3L10.
3. The LC receiving intermediate frequency filter according to claim 2, wherein the seven chip-type multilayer ceramic dielectric capacitors comprise 3C32, 3C33, 3C34, 3C35, 3C37, 3C38, 3C39.
4. The LC receiving intermediate frequency filter according to claim 2, wherein the chip ferrite wire wound inductor is a chip 0603 packaged ferrite wire wound inductor.
5. The LC receiving intermediate frequency filter according to claim 1, wherein the chip-type multilayer ceramic dielectric capacitor employs a chip 0402 packaged multilayer ceramic dielectric capacitor.
6. The LC receiving intermediate frequency filter of claim 1, wherein a groove is formed at the bottom of the housing, a connection groove is formed on the outer surface of the housing, a through hole is formed in the housing, and an isolation screen is installed at the bottom of the housing.
7. The LC receiver intermediate frequency filter according to claim 6, wherein the surface of the groove is a concave arc structure, and the inside of the groove and the inside of the connection groove communicate with each other.
8. The LC receiving intermediate frequency filter of claim 7, wherein the inside of the through hole and the inside of the groove are distributed criss-cross, the isolation screen is installed right below the groove, and the isolation screen is made of a heat dissipation plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221153570.0U CN217883380U (en) | 2022-05-14 | 2022-05-14 | LC receiving intermediate frequency filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221153570.0U CN217883380U (en) | 2022-05-14 | 2022-05-14 | LC receiving intermediate frequency filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217883380U true CN217883380U (en) | 2022-11-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221153570.0U Active CN217883380U (en) | 2022-05-14 | 2022-05-14 | LC receiving intermediate frequency filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217883380U (en) |
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2022
- 2022-05-14 CN CN202221153570.0U patent/CN217883380U/en active Active
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