CN104993798A - Filter circuit with adjustable zero point - Google Patents
Filter circuit with adjustable zero point Download PDFInfo
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- CN104993798A CN104993798A CN201510462780.6A CN201510462780A CN104993798A CN 104993798 A CN104993798 A CN 104993798A CN 201510462780 A CN201510462780 A CN 201510462780A CN 104993798 A CN104993798 A CN 104993798A
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Abstract
The invention discloses a filter circuit with an adjustable zero point. The novel circuit structure is composed of a resonant unit, a coupling inductor and an adjustable capacitor. The filter circuit disclosed by the invention can be widely used on such occasions with strict requirements on signal performance as a WCDMA mobile communication power amplifier, a radar antenna, etc. The filter circuit can be used for inhibiting out-of-band noise and improving the stability of an electronic circuit. Meanwhile, compared with band-pass filter circuits with other structures, the filter circuit disclosed by the invention can be used for achieving adjustable band-pass filter and can 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, 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 bandwidth-limited circuit is due to the problem of its circuit structure, and make temperature sensitivity extremely strong, 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, compact conformation, processing are simple, applied widely.
Summary of the invention
The invention provides a kind of there is adjustable zero point, structure is simple, volume is little, stability is high Novel belt bandpass filter circuit.
The technical scheme realizing the object of the invention is: the filter circuit at a kind of adjustable zero point, is characterized in that: comprise input port 1 (Port1), output port 2 (Port2), two coupling inductance L
1, L2; Inductance L, five electric capacity C, C
1, C
2, C3 and C4; Wherein C is tunable capacitor; Input port 1 (Port1) is connected with node 1; Electric capacity C
1one end be connected with node 1, the other end is connected with node 2; Electric capacity C
2one end be connected with node 2, the other end is connected with node 5; Inductance L
1one end be connected with node 2, the other end is connected with node 5; Inductance L
2one end be connected with node 3, the other end is connected with node 5; Electric capacity C
3one end be connected with node 3, the other end is connected with node 5; Electric capacity C
4one end be connected with node 3, the other end is connected with node 4; One end of electric capacity C is connected with node 1, and the other end is connected with node 4; One end of inductance L is connected with node 5, and the other end is connected to the ground and connects; Output port 2 (Port2) is connected with node 4; Input port 1 (Port1) and output port 2 (Port2) all connect 10 ohmages; This circuit structure is realized by coupling inductance, tunable capacitor and coupled resonance unit.
compared with prior art, the invention provides a kind of adjustable zero point, compact conformation, feature that stability is high.
Accompanying drawing explanation
Fig. 1 is the filter circuit at the present invention's a kind of adjustable zero point.
Fig. 2 is the filter circuit S parameter characteristic curve at the present invention's a kind of adjustable zero point.
Fig. 3 is the filter circuit phase characteristic curve at the present invention's a kind of adjustable zero point.
Fig. 4 is the filter circuit tunable capacitor at the present invention a kind of adjustable zero point S parameter characteristic when getting different value.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Composition graphs 1, the present invention is the filter circuit at a kind of adjustable zero point, it is characterized in that: comprise input port 1 (Port1), output port 2 (Port2), two coupling inductance L
1, L2; Inductance L, five electric capacity C, C
1, C
2, C3 and C4; Wherein C is tunable capacitor; Input port 1 (Port1) is connected with node 1; Electric capacity C
1one end be connected with node 1, the other end is connected with node 2; Electric capacity C
2one end be connected with node 2, the other end is connected with node 5; Inductance L
1one end be connected with node 2, the other end is connected with node 5; Inductance L
2one end be connected with node 3, the other end is connected with node 5; Electric capacity C
3one end be connected with node 3, the other end is connected with node 5; Electric capacity C
4one end be connected with node 3, the other end is connected with node 4; One end of electric capacity C is connected with node 1, and the other end is connected with node 4; One end of inductance L is connected with node 5, and the other end is connected to the ground and connects; Output port 2 (Port2) is connected with node 4; Input port 1 (Port1) and output port 2 (Port2) all connect 10 ohmages; This circuit structure is realized by coupling inductance, tunable capacitor and coupled resonance unit.
composition graphs 2, Fig. 3 can be found out, this filter is the band pass filter of an only transmission zero, and shows linear phase characteristic.
Composition graphs 4, when other component parameters is fixed, when tunable capacitor C changes, can be found out by its simulation result, it is adjustable that this bandwidth-limited circuit can effectively realize transmission zero, this kind of adjustable band pass filter can be used in certain pulse multichannel receiver, and 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. the filter circuit at adjustable zero point, is characterized in that: comprise input port 1 (Port1), output port 2 (Port2), two coupling inductance L
1, L2; Inductance L, five electric capacity C, C
1, C
2, C3 and C4; Wherein C is tunable capacitor; Input port 1 (Port1) is connected with node 1; Electric capacity C
1one end be connected with node 1, the other end is connected with node 2; Electric capacity C
2one end be connected with node 2, the other end is connected with node 5; Inductance L
1one end be connected with node 2, the other end is connected with node 5; Inductance L
2one end be connected with node 3, the other end is connected with node 5; Electric capacity C
3one end be connected with node 3, the other end is connected with node 5; Electric capacity C
4one end be connected with node 3, the other end is connected with node 4; One end of electric capacity C is connected with node 1, and the other end is connected with node 4; One end of inductance L is connected with node 5, and the other end is connected to the ground and connects; Output port 2 (Port2) is connected with node 4; Input port 1 (Port1) and output port 2 (Port2) all connect 10 ohmages; This circuit structure is realized by coupling inductance, tunable capacitor and coupled resonance unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510462780.6A CN104993798A (en) | 2015-08-01 | 2015-08-01 | Filter circuit with adjustable zero point |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510462780.6A CN104993798A (en) | 2015-08-01 | 2015-08-01 | Filter circuit with adjustable zero point |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104993798A true CN104993798A (en) | 2015-10-21 |
Family
ID=54305563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510462780.6A Pending CN104993798A (en) | 2015-08-01 | 2015-08-01 | Filter circuit with adjustable zero point |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104993798A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20170101438A (en) * | 2016-02-29 | 2017-09-06 | 삼성전기주식회사 | Band pass filter of variable band split |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104349A (en) * | 2014-08-03 | 2014-10-15 | 王少夫 | Wireless filtering circuit |
| CN104202006A (en) * | 2014-09-01 | 2014-12-10 | 王少夫 | Adjustable simple low-pass filtering circuit |
| CN104702266A (en) * | 2015-03-20 | 2015-06-10 | 徐园园 | Coupler circuit with different coupling degrees |
-
2015
- 2015-08-01 CN CN201510462780.6A patent/CN104993798A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104104349A (en) * | 2014-08-03 | 2014-10-15 | 王少夫 | Wireless filtering circuit |
| CN104202006A (en) * | 2014-09-01 | 2014-12-10 | 王少夫 | Adjustable simple low-pass filtering circuit |
| CN104702266A (en) * | 2015-03-20 | 2015-06-10 | 徐园园 | Coupler circuit with different coupling degrees |
Non-Patent Citations (1)
| Title |
|---|
| 吴斌: "一种LTCC带通滤波器研制与实现", 《现代电子技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20170101438A (en) * | 2016-02-29 | 2017-09-06 | 삼성전기주식회사 | Band pass filter of variable band split |
| KR102600021B1 (en) | 2016-02-29 | 2023-11-07 | 삼성전기주식회사 | Band pass filter of variable band split |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20151021 |
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| WD01 | Invention patent application deemed withdrawn after publication |