CN104202006A - Adjustable simple low-pass filtering circuit - Google Patents
Adjustable simple low-pass filtering circuit Download PDFInfo
- Publication number
- CN104202006A CN104202006A CN201410439015.8A CN201410439015A CN104202006A CN 104202006 A CN104202006 A CN 104202006A CN 201410439015 A CN201410439015 A CN 201410439015A CN 104202006 A CN104202006 A CN 104202006A
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- CN
- China
- Prior art keywords
- pass filtering
- adjustable
- filtering circuit
- low
- simple low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The invention discloses an adjustable simple low-pass filtering circuit which is composed of an inductor and an adjustable capacitor. The adjustable simple low-pass filtering circuit can be widely applied to devices with high requirements for the signal performance, such as WCDMA (Wideband code division multiple access) mobile communication power amplifiers and radar antenna. The adjustable simple low-pass filtering circuit can restrain out-of-band noise and improve stability of electronic circuits. Meanwhile, compared with the low-pass filtering circuits in other structures, the adjustable simple low-pass filtering circuit can achieve adjustable low-pass filtering and be applied to different frequency bands of a communication system.
Description
Technical field
The invention belongs to communication and electronic application field, particularly in filtering and matching network, there is important application.
Background technology
In the last few years, carried out a series of research about filter circuit both at home and abroad.Obtained a lot of achievements in research, be especially used in mobile communication technology, used in power amplifier front end and radar antenna feed part, filter circuit is the large problem of resolution system passband external noise effectively.But its project organization can only use in specific frequency range, and bandwidth is less, make system bulk larger, versatility is not strong.Simultaneously traditional low-pass filter circuit is due to the problem of its circuit structure, makes temperature sensitivity extremely strongly, and applicability is very limited.The present invention is directed to above problem, can effectively solve, to meet system requirements, and stability is high, volume is little, processing is simple, applied widely.
Summary of the invention
The invention provides a kind of low-pass filter circuit adjustable, simple in structure, that volume is little, stability is high that has.
The technical scheme that realizes the object of the invention is: a kind of adjustable simple and easy low-pass filter circuit, comprises input port 1, output port 2, an inductance, three tunable capacitors; Inductance
with electric capacity
be in parallel, its one end is connected with port one, and the other end is connected with port 2; Another two electric capacity
respectively with
two ends be connected; Electric capacity
other end ground connection.Input port 1 and output port 2 all connect 50 ohmages.
Compared with prior art, the invention provides a kind of adjustable, simple in structure, multiband, volume is little, stability is high feature.
Brief description of the drawings
Fig. 1 is a kind of adjustable simple and easy low-pass filter circuit of the present invention.
Fig. 2 is that a kind of adjustable simple and easy low-pass filter circuit of the present invention inserts and return loss response.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
In conjunction with Fig. 1, the present invention is a kind of adjustable simple and easy low-pass filter circuit, comprises input port 1, output port 2, an inductance, three tunable capacitors; Inductance
with electric capacity
be in parallel, its one end is connected with port one, and the other end is connected with port 2; Another two electric capacity
respectively with
two ends be connected; Electric capacity
other end ground connection.Input port 1 and output port 2 all connect 50 ohmages.
In conjunction with Fig. 2, when inductance is fixed, tunable capacitor
,
when variation, can find out by its simulation result, this low-pass filter circuit can effectively be realized adjustable, designed this kind of adjustable low pass filter oneself successfully for certain pulse multichannel receiver, through the modulation and demodulation of FSK, Output rusults is good.Use result to show that this device has good inhibition degree to channel receiver modulating pulse and noise level, effectively overcome and adopted too complexity, the excessive problem of volume of design procedure in traditional design process, can ensure that device obtains best channel signal laser propagation effect.
Claims (2)
1. an adjustable simple and easy low-pass filter circuit, is characterized in that: comprise input port 1, output port 2, an inductance, three tunable capacitors; Inductance
with electric capacity
be in parallel, its one end is connected with port one, and the other end is connected with port 2; Another two electric capacity
respectively with
two ends be connected; Electric capacity
other end ground connection; Input port 1 and output port 2 all connect 50 ohmages.
2. according to the adjustable simple and easy low-pass filter circuit described in claim 1, it is characterized in that: this circuit structure is realized by inductance, tunable capacitor, electric capacity all adopts tunable capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410439015.8A CN104202006A (en) | 2014-09-01 | 2014-09-01 | Adjustable simple low-pass filtering circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410439015.8A CN104202006A (en) | 2014-09-01 | 2014-09-01 | Adjustable simple low-pass filtering circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104202006A true CN104202006A (en) | 2014-12-10 |
Family
ID=52087248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410439015.8A Pending CN104202006A (en) | 2014-09-01 | 2014-09-01 | Adjustable simple low-pass filtering circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104202006A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993800A (en) * | 2015-08-01 | 2015-10-21 | 王福建 | Easy adjustable band-pass filter circuit |
| CN104993798A (en) * | 2015-08-01 | 2015-10-21 | 徐园园 | Filter circuit with adjustable zero point |
| CN106374877A (en) * | 2016-08-31 | 2017-02-01 | 安徽赛福电子有限公司 | Adjustable photoelectric conversion filter circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10147851A1 (en) * | 2001-09-27 | 2003-04-10 | Aurion Anlagentechnik Gmbh | Matching network with integrated low pass filter has parallel capacitors, series coil, adjustable series capacitor, parallel coil, optional series coil and adjustable series capacitor |
| CN102148610A (en) * | 2010-02-04 | 2011-08-10 | 赫梯特微波公司 | Wideband analog low pass filter |
| CN102347743A (en) * | 2011-05-19 | 2012-02-08 | 南京信息工程大学 | Filter and method for regulating transmission band of same |
| CN204119180U (en) * | 2014-09-01 | 2015-01-21 | 王少夫 | A kind of adjustable simple and easy low-pass filter circuit |
-
2014
- 2014-09-01 CN CN201410439015.8A patent/CN104202006A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10147851A1 (en) * | 2001-09-27 | 2003-04-10 | Aurion Anlagentechnik Gmbh | Matching network with integrated low pass filter has parallel capacitors, series coil, adjustable series capacitor, parallel coil, optional series coil and adjustable series capacitor |
| CN102148610A (en) * | 2010-02-04 | 2011-08-10 | 赫梯特微波公司 | Wideband analog low pass filter |
| CN102347743A (en) * | 2011-05-19 | 2012-02-08 | 南京信息工程大学 | Filter and method for regulating transmission band of same |
| CN204119180U (en) * | 2014-09-01 | 2015-01-21 | 王少夫 | A kind of adjustable simple and easy low-pass filter circuit |
Non-Patent Citations (1)
| Title |
|---|
| 刘光启: "《实用电子电气工程图算手册》", 30 June 1996 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993800A (en) * | 2015-08-01 | 2015-10-21 | 王福建 | Easy adjustable band-pass filter circuit |
| CN104993798A (en) * | 2015-08-01 | 2015-10-21 | 徐园园 | Filter circuit with adjustable zero point |
| CN106374877A (en) * | 2016-08-31 | 2017-02-01 | 安徽赛福电子有限公司 | Adjustable photoelectric conversion filter circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20141210 |
|
| WD01 | Invention patent application deemed withdrawn after publication |