CN204928769U - Absorption type filter - Google Patents
Absorption type filter Download PDFInfo
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- CN204928769U CN204928769U CN201520668753.XU CN201520668753U CN204928769U CN 204928769 U CN204928769 U CN 204928769U CN 201520668753 U CN201520668753 U CN 201520668753U CN 204928769 U CN204928769 U CN 204928769U
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Abstract
The utility model discloses a belong to the attraction formula wave filter in the communication technology components and parts production field, including two ports, parallelly connected L1C1 resonance unit, parallelly connected L2C2 resonance unit and electric capacity constitute, and undulant and signal frequency is undulant has higher adaptability to signal intensity for this utility model, work in can conveniently realizing the frequency range from the low frequency to the high frequency, and high productivity 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.
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, the parameter that only need adjust capacitor C in production can obtain the corresponding band resistance of different frequency range application from low to high.
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; A L in parallel
1c1 resonant element, a L in parallel
2c
2resonant element and electric capacity are formed; Input port 1 (Port1) is connected with node 1; Output port 2 (Port2) is connected with node 2; L
1c
1one end of parallel resonance unit is connected with node 1, and the other end is connected with node 2; L
2c
2one end of parallel resonance unit is connected with node 3, and the other end is connected to the ground and connects; One end of electric capacity C3 is connected with node 1, and the other end is connected with node 3; One end of electric capacity C4 is connected with node 2, and the other end is connected with node 3; Input port 1 (Port1), output port 2 (Port2) all connect 50 ohmages.
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 utility model 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 absorbing mode filter circuit diagram of the utility model.
Fig. 2 is a kind of absorbing mode filter S parameter of the utility model amplitude-versus-frequency curve figure.
Fig. 3 is a kind of absorbing mode filter S parameter of the utility model phase-frequency characteristic curve chart.
Embodiment
Embodiment 1
The present embodiment with the stopband center frequency of filter for 1.36GHz, the absorbing mode filter of full lumped-parameter element structure is adopted to be example: the circuit structure of the present embodiment as shown in Figure 1, accompanying drawing 2 is the S parameter simulation curve figure of the present embodiment filter, and in figure, S11 is signal reflex coefficient, S21 is signal propagation coefficient; As can be seen from Figure 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.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 (1)
1. an absorbing mode filter, comprises two ports; A L in parallel
1c1 resonant element, a L in parallel
2c
2resonant element and electric capacity are formed; Input port 1 (Port1) is connected with node 1; Output port 2 (Port2) is connected with node 2; L
1c
1one end of parallel resonance unit is connected with node 1, and the other end is connected with node 2; L
2c
2one end of parallel resonance unit is connected with node 3, and the other end is connected to the ground and connects; One end of electric capacity C3 is connected with node 1, and the other end is connected with node 3; One end of electric capacity C4 is connected with node 2, and the other end is connected with node 3; Input port 1 (Port1), output port 2 (Port2) all connect 50 ohmages.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520668753.XU CN204928769U (en) | 2015-09-01 | 2015-09-01 | Absorption type filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520668753.XU CN204928769U (en) | 2015-09-01 | 2015-09-01 | Absorption type filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204928769U true CN204928769U (en) | 2015-12-30 |
Family
ID=54977864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520668753.XU Expired - Fee Related CN204928769U (en) | 2015-09-01 | 2015-09-01 | Absorption type filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204928769U (en) |
-
2015
- 2015-09-01 CN CN201520668753.XU patent/CN204928769U/en not_active Expired - Fee Related
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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: 20151230 Termination date: 20160901 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |