CN106603033A - Intermediate-frequency 46.52MHz band pass filter for BeiDou user device - Google Patents
Intermediate-frequency 46.52MHz band pass filter for BeiDou user device Download PDFInfo
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- CN106603033A CN106603033A CN201611272258.2A CN201611272258A CN106603033A CN 106603033 A CN106603033 A CN 106603033A CN 201611272258 A CN201611272258 A CN 201611272258A CN 106603033 A CN106603033 A CN 106603033A
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- inductance
- inductor
- capacitor
- electric capacity
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/0153—Electrical filters; Controlling thereof
- H03H7/0161—Bandpass filters
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Abstract
The invention provides an intermediate-frequency 46.52MHz band pass filter for a BeiDou user device. The intermediate-frequency 46.52MHz band pass filter comprises an input end, an output end and a grounding end. A first inductor and a first capacitor are in parallel connection and arranged between the input end and the grounding end. A second inductor and a second capacitor are in series connection and arranged between the input end and the output end. A third inductor and a third capacitor are in parallel connection and disposed between the output end and the grounding end, and the output end is connected to the third inductor and the third capacitor. After the output end is connected to a fourth inductor and a fourth capacitor and the fourth inductor and the fourth capacitor are in series connection, a fifth inductor and a fifth capacitor are in parallel connection and disposed between the output end and the grounding end. After the output end is connected to a sixth inductor and a sixth capacitor and the sixth inductor and the sixth capacitor are in series connection, a seventh inductor and a seventh capacitor are in parallel connection and disposed between the output end and the grounding end. After the output end is connected to an eighth inductor and an eighth capacitor and the eighth inductor and the eighth capacitor are in series connection, a ninth inductor and a ninth capacitor are in parallel connection and arranged between the output end and the grounding end. Outband clutter of B3 frequency point intermediate-frequency output signals of a radio frequency unit of a BeiDou user device can be filtered, the passband width is greater than or equal to 20MHz, the stop band attenuation is greater than or equal to 60dB, and the in-band fluctuation is smaller than or equal to 1dB.
Description
Technical field
The invention belongs to technical field of satellite communication, is related to Beidou navigation subscriber computer, and in particular to a kind of Beidou subscriber machine
With intermediate frequency 46.52MHz band filters.
Background technology
Generally, Big Dipper if bandpas filter is used to filter Beidou subscriber machine radio frequency unit B3 frequency IF output signals
The outer clutter of band.But the characteristics of wave filter is that passband is wider, and Out-of-band rejection requirement is higher, and 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, the difficulty that the wave filter is designed and realized is further increased.Existing market has various filters
But filtration result is not good.
The content of the invention
In order to solve the above problems, Jing compares more preferably and considers final choice Chebyshev type band filter, its
Feature is that attenuation outside a channel monotonic decreasing disclosure satisfy that the index request of intermediate-frequency filter with grade ripple with interior.
It is an object of the invention to provide a kind of Big Dipper intermediate frequency 46.52MHz band filters, from L, C lamped element
Realize its network parameter.
The technical solution adopted in the present invention is：
A kind of Big Dipper intermediate frequency 46.52MHz band filters, including input, outfan 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 outfan
There are the second inductance and the second capacitances in series；Outfan connects the 3rd inductance and the 3rd electric capacity is arranged in parallel in outfan and earth terminal
Between；Outfan have after connecting the 4th inductance and the 4th capacitances in series the 5th inductance and the 5th electric capacity be arranged in parallel in outfan and
Between earth terminal；There is the 7th inductance to be arranged in parallel in defeated with the 7th electric capacity after outfan the 6th inductance of connection and the 6th capacitances in series
Go out between end and earth terminal；Outfan connects the 8th inductance and has after the 8th capacitances in series that the 9th inductance is in parallel with the 9th electric capacity to be set
It is placed between outfan and earth terminal.
The invention has the beneficial effects as follows：This intermediate frequency 46.52MHz band filters can be very good to be applied to filter Big Dipper use
The outer clutter of band of family machine radio frequency unit B3 frequency IF output signals, works well.Its index is mainly manifested in the wave filter and leads to
Bandwidth >=20MHz, stopband attenuation >=more than 60dB, insertion loss≤3dB, passband fluctuation≤1dB, intermediate zone≤6MHz.
Description of the drawings
Fig. 1 is the structural representation of Big Dipper intermediate frequency 46.52MHz band filters of the present invention.
In figure, the first inductance of L1--, the first electric capacity of C1--, the second inductance of L2--, the second electric capacity of C2--, L3-- the 3rd are electric
Sense, the 3rd electric capacity of C3--, the 4th inductance of L4--, the 4th electric capacity of C4--, the 5th inductance of L5--, the 5th electric capacity of C5--, L6-- the 6th
Inductance, the 6th electric capacity of C6--, the 7th inductance of L7--, the 7th electric capacity of C7--, the 8th inductance of L8--, the 8th electric capacity of C8--, L9--
Nine inductance, the 9th electric capacity of C9--, A-- inputs, B-- outfans, C-- earth terminals.
Specific embodiment
With reference to specific embodiment, the present invention is described in detail.
It is illustrated in figure 1 the structural representation of Big Dipper intermediate frequency 46.52MHz band filters of the present invention, including input
A, outfan B and earth terminal C；There are the first inductance L1 and the first electric capacity C1 to be arranged in parallel in input between input A and earth terminal C
Between the A and earth terminal C of end；There is the second inductance L2 to connect with the second electric capacity C2 between input A and outfan B；Outfan B connects
3rd inductance L3 and the 3rd electric capacity C3 are arranged in parallel between outfan B and earth terminal C；Outfan B connect the 4th inductance L4 with
There are the 5th inductance L5 and the 5th electric capacity C5 to be arranged in parallel between outfan B and earth terminal C after 4th electric capacity C4 series connection；Outfan
B connect have the 7th inductance L7 and the 7th electric capacity C7 to be arranged in parallel in outfan B after the 6th inductance L6 connects with the 6th electric capacity C6 and
Between earth terminal C；Outfan B connects after the 8th inductance L8 is connected with the 8th electric capacity C8 has the 9th inductance L9 and the 9th electric capacity C9 simultaneously
Connection is arranged between outfan B and earth terminal C.
The value of each electronic device is obtained by procedure below above：
First determine the index request for needing band filter to reach, directly give in this example：
Mid 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 in this example is 50 Ω.
The requirement of band filter is converted to into 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 obtained, Chebyshev's normalizing after tabling look-up, is determined
Change the parameter of low pass filter.
By low pass filter scale to cut-off frequency fc=BW3dB=10.0MHz, formula are 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 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 be 61.82nH, the first electric capacity C1 be 200pF, the second inductance L2 be 504.19nH, the second electric capacity C2 be 24pF, the 3rd
Inductance L3 be 37.10nH, the 3rd electric capacity C3 be 330pF, the 4th inductance L4 be 554.88nH, the 4th electric capacity C4 be 22pF, the 5th
Inductance L5 be 36.11nH, the 5th electric capacity C5 be 343pF, the 6th inductance L6 be 554.88nH, the 6th electric capacity C6 be 22pF, the 7th
Inductance L7 be 37.10nH, the 7th electric capacity C7 be 330pF, the 8th inductance L8 be 504.19nH, the 8th electric capacity C8 be 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 invention is decided.
Additionally, when Big Dipper intermediate-frequency filter is manufactured experimently, by the requirement of B3 filter sizes when printed board is designed, basis
The Filter specification has high demands and the characteristics of small volume, and the politef sheet material of preferred thickness 1.0 manufactures printed board, is using
When, signal is input in wave filter from input A, satisfactory signal can be just obtained from outfan B.
Claims (2)
1. a kind of Big Dipper intermediate frequency 46.52MHz band filters, including input (A), outfan (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 connect with the second electric capacity (C2) between input (A) and outfan (B)；
Outfan (B) connect the 3rd inductance (L3) and the 3rd electric capacity (C3) be arranged in parallel in outfan (B) and earth terminal (C) it
Between；
Outfan (B) connects 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 outfan (B) and earth terminal (C)；
Outfan (B) connects 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 outfan (B) and earth terminal (C)；
Outfan (B) connects 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 outfan (B) and earth terminal (C).
2. a kind of Big Dipper intermediate frequency 46.52MHz band 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 |
|---|---|---|---|
| CN201611272258.2A CN106603033B (en) | 2016-12-31 | 2016-12-31 | Intermediate frequency 46.52MHz band-pass filter for Beidou |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611272258.2A CN106603033B (en) | 2016-12-31 | 2016-12-31 | Intermediate frequency 46.52MHz band-pass filter for Beidou |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106603033A true CN106603033A (en) | 2017-04-26 |
| CN106603033B CN106603033B (en) | 2023-09-22 |
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| CN201611272258.2A Active CN106603033B (en) | 2016-12-31 | 2016-12-31 | Intermediate frequency 46.52MHz band-pass filter for Beidou |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112367057A (en) * | 2020-11-09 | 2021-02-12 | 中国科学院微电子研究所 | Frequency hopping filter with composite structure and adjusting method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070296525A1 (en) * | 2006-06-22 | 2007-12-27 | Nec Electonics Corporation | Band-pass filter circuit |
| CN202998014U (en) * | 2012-12-25 | 2013-06-12 | 陕西烽火电子股份有限公司 | Large power band-stop filter |
| US20140369452A1 (en) * | 2013-06-13 | 2014-12-18 | Cambridge Silicon Radio Limited | Method and apparatus for on-demand interference rejection in multi-band gnss receivers |
| CN105048984A (en) * | 2015-08-10 | 2015-11-11 | 西安邮电大学 | Intermediate frequency filter in radio frequency signal transceiver chip |
| CN206412991U (en) * | 2016-12-31 | 2017-08-15 | 陕西烽火电子股份有限公司 | A kind of Big Dipper intermediate frequency 46.52MHz bandpass filters |
-
2016
- 2016-12-31 CN CN201611272258.2A patent/CN106603033B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070296525A1 (en) * | 2006-06-22 | 2007-12-27 | Nec Electonics Corporation | Band-pass filter circuit |
| CN202998014U (en) * | 2012-12-25 | 2013-06-12 | 陕西烽火电子股份有限公司 | Large power band-stop filter |
| US20140369452A1 (en) * | 2013-06-13 | 2014-12-18 | Cambridge Silicon Radio Limited | Method and apparatus for on-demand interference rejection in multi-band gnss receivers |
| CN105048984A (en) * | 2015-08-10 | 2015-11-11 | 西安邮电大学 | Intermediate frequency filter in radio frequency signal transceiver chip |
| CN206412991U (en) * | 2016-12-31 | 2017-08-15 | 陕西烽火电子股份有限公司 | A kind of Big Dipper intermediate frequency 46.52MHz bandpass filters |
Non-Patent Citations (2)
| Title |
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| 墨晶岩;马哲旺;: "低温共烧陶瓷(LTCC)四级低通滤波器设计" * |
| 朱友杰;邢孟江;: "基于LTCC技术的北斗带通滤波器的研究与设计" * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112367057A (en) * | 2020-11-09 | 2021-02-12 | 中国科学院微电子研究所 | Frequency hopping filter with composite structure and adjusting method thereof |
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| CN106603033B (en) | 2023-09-22 |
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