CN204216857U - A kind of adjustable absorbing mode filter - Google Patents
A kind of adjustable absorbing mode filter Download PDFInfo
- Publication number
- CN204216857U CN204216857U CN201420661449.8U CN201420661449U CN204216857U CN 204216857 U CN204216857 U CN 204216857U CN 201420661449 U CN201420661449 U CN 201420661449U CN 204216857 U CN204216857 U CN 204216857U
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- Prior art keywords
- consumption
- parallel
- inductance
- mode filter
- absorbing mode
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Abstract
This utility model belongs to the reflectionless filter in communication technology components and parts production field, comprises two ports; One has consumption in parallel
resonant element, one have consumption series connection
resonant element is formed, and wherein has consumption series connection
resonant element is connected between two inductance of parallel resonance unit; The other end is connected to the ground and connects.This utility model has adjustable function, and have higher adaptability to signal strength signal intensity fluctuation and signal frequency fluctuation, conveniently can realize frequency ranges of operation from low to high, productivity ratio is high, has good application prospect.
Description
Technical field
The utility model belongs to the filter in communication technology components and parts production field, particularly a kind of adjustable absorption reflectionless filter.
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 wireless mobile telecommunication 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.And filter is as the one of filter, there is the effect suppressing unnecessary frequency signal.All kinds of corrupt practices creep in for traditional filter tool based on signal reflex, and the signal that such as stopband attenuation is little, port match is poor, port reflects goes back has a strong impact on systematic function etc.Absorbing mode filter is by absorbing can fundamentally address this problem completely to resistance inband signaling.And effectively realize the regulable center frequency of filter, realize the function of linear phase.
Summary of the invention
The purpose of this utility model is the defect existed for background technology, and a kind of adjustable absorbing mode filter of Curve guide impeller, to overcome the defect that background technology exists, reaches the characteristic that this filter centre frequency is adjustable, have linear phase simultaneously.Realize production technology easy, to the strong adaptability that signal strength signal intensity fluctuation and signal frequency are fluctuated, in production, only need adjust capacitor
the parameter corresponding band that can obtain the application of different frequency range from low to high hinder.
Solution of the present utility model is the defect existed for background technology, adopts a kind of circuit with lumped element model, a kind of aspiration-type filter of Curve guide impeller; This aspiration-type filter comprises two ports, and one has consumption in parallel
resonant element, one have consumption series connection
resonant element is formed; Wherein there is consumption in parallel
the inductance of resonant element is made up of two inductance, consumes series resonator there being consumption parallel resonator and is in parallel with having.Consumption parallel resonator two ends are had to be connected with input port 1, output port 2 respectively; There is consumption series connection
one end is connected between two inductance of parallel resonator, and the other end is connected to the ground and connects; Input port 1 (Port1), output port 2 (Port2) all connect 50 ohmages.There is consumption in parallel
resonator is by a resistance
, an electric capacity
and inductance
be formed in parallel, wherein inductance
be divided into
two inductance (
).By adjustment capacitor
value, this absorbing mode filter regulable center frequency can be realized, and there is linear phase characteristic.
The utility model utilizes lamped element to achieve suppression to stopband signal and absorption, realizes the function of passband signal transmission; This absorbing mode filter can absorb resistance inband signaling well, thus solves the problem that suppressed signal impacts filter front end circuit.Thus the present invention has the function of regulable center frequency, and has linear phase; Production technology is easy, device stable performance in making, reliability are high, to the strong adaptability that signal strength signal intensity fluctuation and signal frequency are fluctuated, easily can realize very wide frequency ranges of operation from low to high, productivity ratio is high, has the features such as good application prospect in modern communications electronic system.
Accompanying drawing explanation
Fig. 1 is a kind of adjustable absorbing mode filter circuit diagram of the utility model.
Fig. 2 is a kind of adjustable absorbing mode filter S parameter characteristic figure of the utility model.
Fig. 3 is a kind of adjustable absorbing mode filter phase characteristic curve figure of the utility model.
Fig. 4 is that a kind of adjustable absorbing mode filter of the utility model is with electric capacity
during change, filter S21 parameter characteristic figure.
Embodiment
Embodiment 1: the present embodiment with the stopband center frequency of filter for 2GHz, the absorbing mode filter of full lumped-parameter element structure is adopted to be example: the circuit structure of the present embodiment is as shown in accompanying drawing 1, accompanying drawing 2 is the S parameters simulation curve chart of the present embodiment filter, and in figure, S11 is signal reflex coefficient, S21 is signal propagation coefficient; Can find out from Fig. 2: the present embodiment is fine to signal suppressing in stopband, is absorbed by absorption resistance completely, does not occur reflected signal.Accompanying drawing 3 is aspiration-type filter phases performance diagram of the present utility model, and as can be seen from Figure 3, the filter of the present embodiment has the characteristic of linear phase.When the electric capacity in example
get different parameters, as can be seen from accompanying drawing 4, by changing electric capacity
value, the present embodiment has the adjustable function of filter centre frequency.
Designed by there is linear phase filter can be used in wireless WLAN mobile communication, through the modulation and demodulation of FSK, Output rusults is good.Use result to show that this device has good degree of suppression to channel receiver modulating pulse and noise level, effectively overcome the shortcoming of conventional filter.Can ensure that device obtains best channel signal assimilation effect.
Claims (4)
1. an adjustable absorbing mode filter, comprises two ports, and one has consumption in parallel
resonant element, one have consumption series connection
resonant element is formed; Wherein there is consumption in parallel
the inductance of resonant element is made up of two inductance, there being consumption parallel resonator consume series resonator and be in parallel with having, having and consuming parallel resonator two ends and be connected with input port 1, output port 2 respectively; There is consumption series connection
one end is connected between two inductance of parallel resonator, and the other end is connected to the ground and connects; Input port 1 (Port1), output port 2 (Port2) all connect 50 ohmages.
2., by adjustable absorbing mode filter described in claim 1, it is characterized in that: described in have consumption in parallel
resonator is by a resistance
, an electric capacity
and inductance
be formed in parallel, wherein inductance
be divided into
two inductance (
).
3., by adjustable absorbing mode filter described in claim 1, it is characterized in that: described in have consumption in parallel
resonator with connect
resonator is in parallel.
4. by adjustable absorbing mode filter described in claim 1, it is characterized in that: by adjustment capacitor
value, this absorbing mode filter regulable center frequency can be realized, and there is linear phase characteristic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420661449.8U CN204216857U (en) | 2014-11-07 | 2014-11-07 | A kind of adjustable absorbing mode filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420661449.8U CN204216857U (en) | 2014-11-07 | 2014-11-07 | A kind of adjustable absorbing mode filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204216857U true CN204216857U (en) | 2015-03-18 |
Family
ID=52985489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420661449.8U Expired - Fee Related CN204216857U (en) | 2014-11-07 | 2014-11-07 | A kind of adjustable absorbing mode filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204216857U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109004912A (en) * | 2018-07-18 | 2018-12-14 | 南京邮电大学 | The low reflection-absorption formula filter of symmetrical dual-port |
-
2014
- 2014-11-07 CN CN201420661449.8U patent/CN204216857U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109004912A (en) * | 2018-07-18 | 2018-12-14 | 南京邮电大学 | The low reflection-absorption formula filter of symmetrical dual-port |
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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: 20150318 Termination date: 20151107 |
|
| EXPY | Termination of patent right or utility model |