CN204119180U - A kind of adjustable simple and easy low-pass filter circuit - Google Patents
A kind of adjustable simple and easy low-pass filter circuit Download PDFInfo
- Publication number
- CN204119180U CN204119180U CN201420498599.1U CN201420498599U CN204119180U CN 204119180 U CN204119180 U CN 204119180U CN 201420498599 U CN201420498599 U CN 201420498599U CN 204119180 U CN204119180 U CN 204119180U
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- China
- Prior art keywords
- pass filter
- filter circuit
- utility
- model
- low
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- 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 utility model discloses a kind of adjustable simple and easy low-pass filter circuit, this circuit structure is realized by inductance, tunable capacitor.The utility model can be widely used in WCDMA power of mobile communication amplifier, radar antenna etc. to the strict place of signal performance requirement.Can inhibition zone external noise, improve the stability of electronic circuit.Meanwhile, compare the low-pass filter circuit of other structures, it is adjustable that the utility model can realize low-pass filtering, and can apply in the different frequency range of communication system.
Description
Technical field
The utility model belongs to communication and electronic application field, particularly in filtering and matching network, has important application.
Background technology
In the last few years, a series of research about filter circuit had been carried out both at home and abroad.Achieve a lot of achievement in research, be especially used in mobile communication technology, be used in power-amplifier front-end and radar antenna feed part, filter circuit effectively can solve the large problem of system passband external noise.But its project organization can only use in specific frequency range, and bandwidth is less, make system bulk comparatively large, and versatility is not strong.Simultaneously traditional low-pass filter circuit is due to the problem of its circuit structure, and make temperature sensitivity extremely strong, applicability is very limited.The utility model, for above problem, can effectively solve, and to meet system requirements, and stability is high, volume is little, processing is simple, applied widely.
Summary of the invention
The utility model provides a kind of and has adjustable, that structure is simple, volume is little, stability is high low-pass filter circuit.
The technical scheme realizing the utility model object is: a kind of adjustable simple and easy low-pass filter circuit, comprises input port 1, output port 2, 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 utility model provides the feature that a kind of adjustable, structure is simple, multiband, volume are little, stability is high.
Accompanying drawing explanation
Fig. 1 is a kind of adjustable simple and easy low-pass filter circuit of the utility model.
Fig. 2 is a kind of adjustable simple and easy low-pass filter circuit S parameter response diagram of the utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Composition graphs 1, the utility model is a kind of adjustable simple and easy low-pass filter circuit, comprises input port 1, output port 2, 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.
Composition graphs 2, when inductance is fixed, tunable capacitor
,
during change, can be found out by its simulation result, this low-pass filter circuit can effectively realize adjustable, designed this kind of adjustable low pass filter oneself be used successfully in certain pulse multichannel receiver, through the modulation and demodulation of FSK, Output rusults is good.Result is used to show that this device has good degree of suppression to channel receiver modulating pulse and noise level, effectively overcome and adopt the problem that in traditional design process, design procedure is too complicated, volume is excessive, can ensure that device obtains best channel signal transmission effect.
Claims (1)
1. an adjustable simple and easy low-pass filter circuit, is characterized in that: comprise input port 1, output port 2, inductance, three tunable capacitors; Inductance L and electric capacity C
2be in parallel, its one end is connected with port one, and the other end is connected with port 2; Another two electric capacity C
2respectively with C
1two ends be connected; Electric capacity C
1other end ground connection, input port 1 and output port 2 all connect 50 ohmages.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420498599.1U CN204119180U (en) | 2014-09-01 | 2014-09-01 | A kind of adjustable simple and easy low-pass filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420498599.1U CN204119180U (en) | 2014-09-01 | 2014-09-01 | A kind of adjustable simple and easy low-pass filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204119180U true CN204119180U (en) | 2015-01-21 |
Family
ID=52336456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420498599.1U Expired - Fee Related CN204119180U (en) | 2014-09-01 | 2014-09-01 | A kind of adjustable simple and easy low-pass filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204119180U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104202006A (en) * | 2014-09-01 | 2014-12-10 | 王少夫 | Adjustable simple low-pass filtering circuit |
-
2014
- 2014-09-01 CN CN201420498599.1U patent/CN204119180U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104202006A (en) * | 2014-09-01 | 2014-12-10 | 王少夫 | Adjustable simple low-pass filtering circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150121 Termination date: 20150901 |
|
| EXPY | Termination of patent right or utility model |