CN209497433U - A kind of absorption-type low-pass filter - Google Patents
A kind of absorption-type low-pass filter Download PDFInfo
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- CN209497433U CN209497433U CN201920324972.4U CN201920324972U CN209497433U CN 209497433 U CN209497433 U CN 209497433U CN 201920324972 U CN201920324972 U CN 201920324972U CN 209497433 U CN209497433 U CN 209497433U
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Abstract
The utility model proposes a kind of absorption-type low-pass filters, by the way that multiple filter circuits are arranged, it can inhibit out-of-band interference signal, filter circuit have the characteristics that miniaturization and it is modular, miniaturization feature can reduce the volume of filter, modular feature, facilitate extension, filter circuit can be increased according to different application scenarios, due to the miniaturization and modularization feature of filter circuit, so that filter there are extensive market prospects in military, civil field；By the way that low-pass filter circuit and multiple absorbing circuits are arranged in filter circuit, the back wave in stopband can be absorbed, realize and keep original flat group delay characteristic, but also filter is in passband and stopband with the purpose of lower reflection coefficient；Whole device can reduce the volume of filter, increase the extended capability of filter, under the premise of holding filter original flat group delay characteristic, reduce reflection coefficient of the filter in passband and stopband.
Description
Technical field
The utility model relates to wireless telecommunications skill field more particularly to a kind of absorption-type low-pass filters.
Background technique
Filter is widely used in the microwave systems such as radar, electronic countermeasure, satellite communication, is the critical component of microwave system
One of, mainly play clutter recognition.In recent years, a series of researchs about filter circuit have been carried out both at home and abroad, have achieved very
More research achievements, are especially used in wireless mobile telecommunication technology, using in power-amplifier front-end and radar antenna feed
Part, filter circuit can effectively solve the big problem of the outer noise of system passband.And the one kind of filter as filter element, have
Inhibit the effect of unnecessary frequency signal.All kinds of corrupt practices creep in for traditional filter tool based on signal reflex, such as stopband attenuation
Signal small, that port match is poor, port reflects back seriously affects system performance etc..In number and two-forty signal transmission system
In system, through frequently with Bessel or Gaussian function filter, such filter is only at centre frequency (bandpass filter)
Or (low-pass filter) just has good matching properties at DC, and clutter and interference can be generated in the cascade of microwave circuit, therefore,
To solve the above problems, the utility model provides a kind of low-pass filter by fully absorbing to resistance inband signaling.
Utility model content
In view of this, the utility model proposes a kind of low-pass filters by fully absorbing to resistance inband signaling.
The technical solution of the utility model is achieved in that the utility model provides a kind of absorption-type low-pass filtering
Device comprising filter input end mouth and filter output mouth further include multiple concatenated filter circuits；
Filter circuit includes a low-pass filter circuit and multiple concatenated absorbing circuits, first absorbing circuit and low pass
Filter circuit is electrically connected；
Low-pass filter circuit and filter input end mouth in first filter circuit are electrically connected, the last one filtered electrical
Low-pass filter circuit and filter output mouth in road are electrically connected, and the low-pass filter circuit in filter circuit is in sequential series.
On the basis of above technical scheme, it is preferred that low-pass filter circuit includes inductance L1, resistance R1 and capacitor C1；
One end of inductance L1 and filter input end mouth are electrically connected, the other end of inductance L1 and next low-pass filtering electricity
Road is electrically connected, and resistance R1 is in parallel with inductance L1, and the input terminal of absorbing circuit and one end of inductance L1 are electrically connected, absorbing circuit
Output end be grounded by capacitor C1.
It is further preferred that absorbing circuit includes inductance L4, resistance R4, conductance G1 and capacitor C5；
One end of inductance L4 and one end of inductance L1 are electrically connected, and the other end of inductance L4 electrically connects with one end of resistance R4
It connects, the other end of resistance R4 is electrically connected with one end of conductance G1 and next absorbing circuit respectively, another termination of resistance R5
Ground, capacitor C5 are in parallel with conductance G1.
On the basis of above technical scheme, it is preferred that filter it is integrated in metal shell.
A kind of absorption-type low-pass filter of the utility model has the advantages that compared with the existing technology
(1) by the way that multiple filter circuits are arranged, out-of-band interference signal can be inhibited, filter circuit has miniaturization and module
The characteristics of change, miniaturization feature can reduce the volume of filter, and modular feature facilitates extension, can be according to not
Same application scenarios increase filter circuit, due to the miniaturization and modularization feature of filter circuit, so that filter is in the military, people
There are extensive market prospects with field；
(2) it by the way that low-pass filter circuit and multiple absorbing circuits are arranged in filter circuit, can be absorbed anti-in stopband
Ejected wave is realized and keeps original flat group delay characteristic, but also filter has lower reflection in passband and stopband
The purpose of coefficient；
(3) whole device can reduce the volume of filter, increase the extended capability of filter, keep filter original
Flat group delay characteristic under the premise of, reduce reflection coefficient of the filter in passband and stopband.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of structure chart of absorption-type low-pass filter of the utility model；
Fig. 2 is a kind of circuit diagram of the filter circuit of absorption-type low-pass filter of the utility model；
Fig. 3 is the circuit diagram of absorbing circuit in a kind of filter circuit of absorption-type low-pass filter of the utility model.
Specific embodiment
Below in conjunction with the utility model embodiment, the technical solution in the utility model embodiment is carried out clear
Chu is fully described by, it is clear that and described embodiment is only a part of embodiment of the utility model, rather than all
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative work
Under the premise of every other embodiment obtained, fall within the protection scope of the utility model.
As shown in Figure 1, a kind of absorption-type low-pass filter of the utility model comprising filter input end mouth, filtering
Device output port and multiple concatenated filter circuits；Wherein, filter circuit includes a low-pass filter circuit and multiple concatenated
Absorbing circuit, first absorbing circuit and the low-pass filter circuit are electrically connected；Low-pass filtering in first filter circuit
Circuit and filter input end mouth are electrically connected, low-pass filter circuit and filter output mouth in the last one filter circuit
It is electrically connected, the low-pass filter circuit in filter circuit is in sequential series.In the present embodiment, filter is integrated and metal shell
It is interior, it ensure that thermal stability and the complicated anti-interference condition of electromagnetism.
Filter circuit, filtering clutter and interference.Filter circuit includes a low-pass filter circuit and multiple concatenated absorptions
Circuit；Low-pass filter circuit, has the function that frequency-selecting, absorbing circuit, and absorption edge oral reflex wave reduces back wave to the shadow of system
It rings.In the present embodiment, the quantity of filter circuit is more, and filtering index is better.Therefore, in the present embodiment, filter circuit
Quantity is 3, and is named as the first filter circuit, the second filter circuit and third filter circuit, then the number of low-pass filter circuit
Amount is also 3, and is named as the first low-pass filter circuit, the second low-pass filter circuit and third low-pass filter circuit, each filter
3 absorbing circuits are selected in wave circuit, and are named as the first absorbing circuit, the second absorbing circuit and third absorbing circuit, such as 2 figures
Shown, the first low-pass filter circuit includes inductance L1, resistance R1 and capacitor C1, and the second low-pass filter circuit includes inductance L2, electricity
R2 and capacitor C2 is hindered, third low-pass filter circuit includes inductance L3, resistance R3 and capacitor C3；Specifically, inductance L1, inductance L2,
Inductance L3 is sequentially connected in series, and resistance R1 is in parallel with inductance L1, and resistance R2 is in parallel with inductance L2, and resistance R3 is in parallel with inductance L3, resistance
R4 is in parallel with inductance L4, and one end of inductance L1 and filter input end mouth are electrically connected, absorbing circuit in the first filter circuit
One end of input terminal and inductance L1 are electrically connected, and the output end of absorbing circuit is grounded by capacitor C1 in the first filter circuit, the
The other end of the input terminal of absorbing circuit and inductance L1 are electrically connected in two filter circuits, absorbing circuit in the second filter circuit
Output end is grounded by capacitor C2, and one end of the input terminal of absorbing circuit and inductance L3 are electrically connected in third filter circuit, the
The output end of absorbing circuit is grounded by capacitor C3 in three filter circuits.Wherein, by the electricity of absorbing circuit in the first filter circuit
It leads and is named as g1, the conductance of absorbing circuit is named as g2 in the second filter circuit, the conductance of absorbing circuit in third filter circuit
It is named as g3, the relationship in three filter circuits between the conductance of absorbing circuit are as follows: g1=1/2g2=1/2g3, C1=1/2C2
=1/2C3.
As shown in figure 3, the first absorbing circuit includes inductance L4, resistance R4, conductance G1 and capacitor C5；Second absorbing circuit packet
Include inductance L5, resistance R5, conductance G2 and capacitor C6；Third absorbing circuit includes inductance L6, resistance R6, conductance G3 and capacitor C7；
Specifically, one end of inductance L4 and one end of inductance L1 are electrically connected, the other end of inductance L4 electrically connects with one end of resistance R4
It connecing, the other end of resistance R4 is electrically connected with one end of conductance G1 and one end of inductance L5 respectively, the other end ground connection of conductance G1,
Capacitor C5 is in parallel with conductance G1；One end of the other end of inductance L5 and resistance R5 are electrically connected, the other end of resistance R5 respectively with
One end of conductance G2 and one end of inductance L6 are electrically connected, the other end ground connection of conductance G2, and capacitor C6 is in parallel with conductance G2；Inductance
One end of the other end of L6 and resistance R6 are electrically connected, the other end of resistance R6 respectively with one end of conductance G3 and capacitor C1 one
End is electrically connected, the other end ground connection of capacitor C1, the other end ground connection of conductance G3, and capacitor C7 is in parallel with conductance G3.Due to each
The structure of filter circuit is identical, and low-pass filter circuit is all the same, and absorbing circuit is all the same, therefore, is discussed in detail first at this
The structure of absorbing circuit in filter circuit.
The foregoing is merely the better embodiments of the utility model, are not intended to limit the utility model, it is all
Within the spirit and principles of the utility model, it is practical new to should be included in this for any modification, equivalent replacement, improvement and so on
Within the protection scope of type.
Claims (4)
1. a kind of absorption-type low-pass filter comprising filter input end mouth and filter output mouth, it is characterised in that: also
Including multiple concatenated filter circuits；
The filter circuit includes a low-pass filter circuit and multiple concatenated absorbing circuits, first absorbing circuit with
The low-pass filter circuit is electrically connected；
Low-pass filter circuit and filter input end mouth in first filter circuit are electrically connected, the last one filtered electrical
Low-pass filter circuit and filter output mouth in road are electrically connected, and the low-pass filter circuit in filter circuit is in sequential series.
2. a kind of absorption-type low-pass filter as described in claim 1, it is characterised in that: the low-pass filter circuit includes electricity
Feel L1, resistance R1 and capacitor C1；
One end of the inductance L1 and filter input end mouth are electrically connected, the other end of inductance L1 and next low-pass filtering electricity
Road is electrically connected, and resistance R1 is in parallel with inductance L1, and the input terminal of absorbing circuit and one end of inductance L1 are electrically connected, absorbing circuit
Output end be grounded by capacitor C1.
3. a kind of absorption-type low-pass filter as claimed in claim 2, it is characterised in that: the absorbing circuit includes inductance
L4, resistance R4, conductance G1 and capacitor C5；
One end of the inductance L4 and one end of inductance L1 are electrically connected, and the other end of inductance L4 electrically connects with one end of resistance R4
It connects, the other end of resistance R4 is electrically connected with one end of conductance G1 and next absorbing circuit respectively, another termination of resistance R5
Ground, capacitor C5 are in parallel with conductance G1.
4. a kind of absorption-type low-pass filter as described in claim 1, it is characterised in that: the filter it is integrated with outside metal
In shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920324972.4U CN209497433U (en) | 2019-03-14 | 2019-03-14 | A kind of absorption-type low-pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920324972.4U CN209497433U (en) | 2019-03-14 | 2019-03-14 | A kind of absorption-type low-pass filter |
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| Publication Number | Publication Date |
|---|---|
| CN209497433U true CN209497433U (en) | 2019-10-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920324972.4U Active CN209497433U (en) | 2019-03-14 | 2019-03-14 | A kind of absorption-type low-pass filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111525903A (en) * | 2020-03-30 | 2020-08-11 | 北京邮电大学 | Broadband absorption type band-stop filter chip based on thin film IPD technology |
-
2019
- 2019-03-14 CN CN201920324972.4U patent/CN209497433U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111525903A (en) * | 2020-03-30 | 2020-08-11 | 北京邮电大学 | Broadband absorption type band-stop filter chip based on thin film IPD technology |
| CN111525903B (en) * | 2020-03-30 | 2022-02-08 | 北京邮电大学 | Broadband absorption type band-stop filter chip based on thin film IPD technology |
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