CN206412991U - A kind of Big Dipper intermediate frequency 46.52MHz bandpass filters - Google Patents
A kind of Big Dipper intermediate frequency 46.52MHz bandpass filters Download PDFInfo
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- CN206412991U CN206412991U CN201621495881.XU CN201621495881U CN206412991U CN 206412991 U CN206412991 U CN 206412991U CN 201621495881 U CN201621495881 U CN 201621495881U CN 206412991 U CN206412991 U CN 206412991U
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- inductance
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Abstract
The utility model is a kind of Big Dipper intermediate frequency 46.52MHz bandpass filters, including input, output end and earth terminal wherein have the first inductance and the first electric capacity to be arranged in parallel between input and earth terminal between input and earth terminal；There is the second inductance to be connected with the second electric capacity between input and output end；Output end connects the 3rd inductance and the 3rd electric capacity is arranged in parallel between output end and earth terminal；Output end, which is connected after the 4th inductance is connected with the 4th electric capacity, has the 5th inductance and the 5th electric capacity to be arranged in parallel between output end and earth terminal；Output end, which is connected after the 6th inductance is connected with the 6th electric capacity, has the 7th inductance and the 7th electric capacity to be arranged in parallel between output end and earth terminal；Output end, which is connected after the 8th inductance is connected with the 8th electric capacity, has the 9th inductance and the 9th electric capacity to be arranged in parallel between output end and earth terminal.The utility model can filter out the outer clutter of band of Beidou subscriber machine radio frequency unit B3 frequency IF output signals, passband width >=20MHz, stopband attenuation >=60dB, passband fluctuation≤1dB.
Description
Technical field
The utility model belongs to technical field of satellite communication, is related to Beidou navigation subscriber computer, and in particular to a kind of Big Dipper is used
Family machine intermediate frequency 46.52MHz bandpass filters.
Background technology
Generally, Big Dipper if bandpas filter is used to filter out Beidou subscriber machine radio frequency unit B3 frequency IF output signals
The outer clutter of band.But be that passband is wider the characteristics of the wave filter, and Out-of-band rejection requires higher, maximum suppression ratio requires to be more than
60dB.Meanwhile, and because its intermediate zone is less than normal, wherein B3 intermediate frequencies are 6MHz, therefore realize that to effectively filter out difficulty just very big.Secondly,
Because of the volume and very little of the wave filter, wave filter design and the difficulty realized are further increased.Existing market has various filters
But filtration result is not good.
Utility model content
In order to solve the above problems, through than more preferably and considering final choice Chebyshev type bandpass filter, its
Feature is that band is interior with ripple is waited, and attenuation outside a channel monotonic decreasing disclosure satisfy that the index request of intermediate-frequency filter.
The purpose of this utility model is to provide a kind of Big Dipper intermediate frequency 46.52MHz bandpass filters, from L, C lump
Element realizes its network parameter.
The technical scheme that the utility model is used is：
A kind of Big Dipper intermediate frequency 46.52MHz bandpass filters, including input, output end and earth terminal；Input with
There are the first inductance and the first electric capacity to be arranged in parallel between input and earth terminal between earth terminal；Between input and output end
There is the second inductance to be connected with the second electric capacity；Output end connects the 3rd inductance and the 3rd electric capacity is arranged in parallel in output end and earth terminal
Between；Output end connect have after the 4th inductance is connected with the 4th electric capacity the 5th inductance and the 5th electric capacity be arranged in parallel in output end and
Between earth terminal；Output end, which is connected after the 6th inductance is connected with the 6th electric capacity, has the 7th inductance to be arranged in parallel with the 7th electric capacity in defeated
Go out between end and earth terminal；Output end, which is connected after the 8th inductance is connected with the 8th electric capacity, has the 9th inductance is in parallel with the 9th electric capacity to set
It is placed between output end and earth terminal.
The beneficial effects of the utility model are：This intermediate frequency 46.52MHz bandpass filters can be very good to be applied to filter out north
The outer clutter of band of bucket subscriber computer radio frequency unit B3 frequency IF output signals, works well.Its index is mainly manifested in the filtering
Device passband width >=20MHz, stopband attenuation >=more than 60dB, insertion loss≤3dB, passband fluctuation≤1dB, intermediate zone≤
6MHz。
Brief description of the drawings
Fig. 1 is the structural representation of the utility model Big Dipper intermediate frequency 46.52MHz bandpass filters.
In figure, the inductance of L1-- first, the electric capacity of C1-- first, the inductance of L2-- second, the electric capacity of C2-- second, the electricity of L3-- the 3rd
Sense, the electric capacity of C3-- the 3rd, the inductance of L4-- the 4th, the electric capacity of C4-- the 4th, the inductance of L5-- the 5th, the electric capacity of C5-- the 5th, L6-- the 6th
Inductance, the electric capacity of C6-- the 6th, the inductance of L7-- the 7th, the electric capacity of C7-- the 7th, the inductance of L8-- the 8th, the electric capacity of C8-- the 8th, L9--
Nine inductance, the electric capacity of C9-- the 9th, A-- inputs, B-- output ends, C-- earth terminals.
Embodiment
The utility model is described in detail with reference to specific embodiment.
It is as shown in Figure 1 the structural representation of the utility model Big Dipper intermediate frequency 46.52MHz bandpass filters, including it is defeated
Enter to hold A, output end B and earth terminal C；Have between input A and earth terminal C the first inductance L1 and the first electric capacity C1 be arranged in parallel in
Between input A and earth terminal C；There is the second inductance L2 to be connected with the second electric capacity C2 between input A and output end B；Output end B
Connect the 3rd inductance L3 and the 3rd electric capacity C3 is arranged in parallel between output end B and earth terminal C；The inductance of output end B connections the 4th
L4 has the 5th inductance L5 and the 5th electric capacity C5 to be arranged in parallel between output end B and earth terminal C after being connected with the 4th electric capacity C4；It is defeated
Go out to hold the inductance L6 of B connections the 6th to there is the 7th inductance L7 and the 7th electric capacity C7 to be arranged in parallel in output end after being connected with the 6th electric capacity C6
Between B and earth terminal C；The inductance L8 of output end B connections the 8th has the 9th inductance L9 and the 9th electric capacity after being connected with the 8th electric capacity C8
C9 is arranged in parallel between output end B and earth terminal C.
The value of each electronic device is obtained by procedure below above：
First determine to need to directly give in the index request that bandpass filter reaches, this example：
Centre frequency f0=46.52MHz；
f0Decay at ± 10.0MHz is not more than 3.0dB；
f0Passband fluctuation at ± 10.0MHz is not more than 1.0dB；
f0Decay at ± 16MHz is not less than 40dB；
f0Decay at ± 25MHz is not less than 60dB；
Input and output impedance is 50 Ω in this example.
The requirement of bandpass filter is converted to the requirement of equivalent low pass：
f0=46.52MHz；
BW3dB=10.0MHz；
BW40dB=16MHz；
BW60dB=25MHz；
Select n=9.
Chebyshev's normalization low pass filter of 0.1dB passband fluctuations is can obtain, Chebyshev's normalizing is determined after tabling look-up
Change the parameter of low pass filter.
By low pass filter scale to cut-off frequency fc=BW3dB=10.0MHz, formula is as follows：
L*=L*R/ ωc=L*50/2 π fc ①
C*=C/ ωc=C/2 π fc*50 ②
Low pass is converted into band logical again, formula is as follows：
Cn=1/ ω0 2*Ln * ③
Ln=1/ ω0 2*Cn * ④
Tabled look-up according to above-mentioned, and 1., 2., 3., 4. formula calculate after, the parameter value that can obtain each device is as follows：First
Inductance L1 is 61.82nH, and the first electric capacity C1 is 200pF, and the second inductance L2 is 504.19nH, and the second electric capacity C2 is 24pF, the 3rd
Inductance L3 is 37.10nH, and the 3rd electric capacity C3 is 330pF, and the 4th inductance L4 is 554.88nH, and the 4th electric capacity C4 is 22pF, the 5th
Inductance L5 is 36.11nH, and the 5th electric capacity C5 is 343pF, and the 6th inductance L6 is 554.88nH, and the 6th electric capacity C6 is 22pF, the 7th
Inductance L7 is 37.10nH, and the 7th electric capacity C7 is 330pF, and the 8th inductance L8 is 504.19nH, and the 8th electric capacity C8 is 24pF, the 9th
Inductance L9 is 61.82nH, and the 9th electric capacity C9 is 200pF.
Thus the parameter value of each device of the present utility model is decided.
In addition, when manufacturing experimently Big Dipper intermediate-frequency filter, basis by the requirement of B3 filter sizes when designing printed board
The characteristics of Filter specification requires height and small volume, the polytetrafluoroethylene (PTFE) sheet material of preferred thickness 1.0 manufactures printed board, is using
When, by signal from input A is input to wave filter, satisfactory signal can be just obtained from output end B.
Claims (2)
1. a kind of Big Dipper intermediate frequency 46.52MHz bandpass filters, including input (A), output end (B) and earth terminal (C), its
It is characterised by：
Have between input (A) and earth terminal (C) the first inductance (L1) and the first electric capacity (C1) be arranged in parallel in input (A) with
Between earth terminal (C)；
There is the second inductance (L2) to be connected with the second electric capacity (C2) between input (A) and output end (B)；
Output end (B) connect the 3rd inductance (L3) and the 3rd electric capacity (C3) be arranged in parallel in output end (B) and earth terminal (C) it
Between；
Output end (B), which is connected after the 4th inductance (L4) is connected with the 4th electric capacity (C4), the 5th inductance (L5) and the 5th electric capacity (C5)
It is arranged in parallel between output end (B) and earth terminal (C)；
Output end (B), which is connected after the 6th inductance (L6) is connected with the 6th electric capacity (C6), the 7th inductance (L7) and the 7th electric capacity (C7)
It is arranged in parallel between output end (B) and earth terminal (C)；
Output end (B), which is connected after the 8th inductance (L8) is connected with the 8th electric capacity (C8), the 9th inductance (L9) and the 9th electric capacity (C9)
It is arranged in parallel between output end (B) and earth terminal (C).
2. a kind of Big Dipper intermediate frequency 46.52MHz bandpass filters as claimed in claim 1, it is characterised in that：
First inductance (L1) is 61.82nH, and the first electric capacity (C1) is 200pF；
Second inductance (L2) is 504.19nH, and the second electric capacity (C2) is 24pF；
3rd inductance (L3) is 37.10nH, and the 3rd electric capacity (C3) is 330pF；
4th inductance (L4) is 554.88nH, and the 4th electric capacity (C4) is 22pF；
5th inductance (L5) is 36.11nH, and the 5th electric capacity (C5) is 343pF；
6th inductance (L6) is 554.88nH, and the 6th electric capacity (C6) is 22pF；
7th inductance (L7) is 37.10nH, and the 7th electric capacity (C7) is 330pF；
8th inductance (L8) is 504.19nH, and the 8th electric capacity (C8) is 24pF；
9th inductance (L9) is 61.82nH, and the 9th electric capacity (C9) is 200pF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621495881.XU CN206412991U (en) | 2016-12-31 | 2016-12-31 | A kind of Big Dipper intermediate frequency 46.52MHz bandpass filters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621495881.XU CN206412991U (en) | 2016-12-31 | 2016-12-31 | A kind of Big Dipper intermediate frequency 46.52MHz bandpass filters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206412991U true CN206412991U (en) | 2017-08-15 |
Family
ID=59553076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621495881.XU Withdrawn - After Issue CN206412991U (en) | 2016-12-31 | 2016-12-31 | A kind of Big Dipper intermediate frequency 46.52MHz bandpass filters |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206412991U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106603033A (en) * | 2016-12-31 | 2017-04-26 | 陕西烽火电子股份有限公司 | Intermediate-frequency 46.52MHz band pass filter for BeiDou user device |
| CN107681989A (en) * | 2017-10-20 | 2018-02-09 | 江苏瑞牧电子科技有限公司 | Feed-through capacitor formula power-supply filter and screened room |
-
2016
- 2016-12-31 CN CN201621495881.XU patent/CN206412991U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106603033A (en) * | 2016-12-31 | 2017-04-26 | 陕西烽火电子股份有限公司 | Intermediate-frequency 46.52MHz band pass filter for BeiDou user device |
| CN106603033B (en) * | 2016-12-31 | 2023-09-22 | 陕西烽火电子股份有限公司 | Intermediate frequency 46.52MHz band-pass filter for Beidou |
| CN107681989A (en) * | 2017-10-20 | 2018-02-09 | 江苏瑞牧电子科技有限公司 | Feed-through capacitor formula power-supply filter and screened room |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170815 Effective date of abandoning: 20230922 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20170815 Effective date of abandoning: 20230922 |