CN208753482U - A kind of cavity bandstop filter that performance is stable - Google Patents
A kind of cavity bandstop filter that performance is stable Download PDFInfo
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- CN208753482U CN208753482U CN201820711620.XU CN201820711620U CN208753482U CN 208753482 U CN208753482 U CN 208753482U CN 201820711620 U CN201820711620 U CN 201820711620U CN 208753482 U CN208753482 U CN 208753482U
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Abstract
A kind of stable cavity bandstop filter of performance of the utility model, including filter cavity, cover board, microstripline plate, the cover board capping filter cavity forms multiple resonant cavities, resonant column is respectively set in the resonant cavity, the microstripline plate is located between cover board and filter cavity, the lower surface of the microstripline plate is equipped with signal output point, signal input point, coupling disc and connecting line, the resonant cavity setting of the corresponding lower section of the coupling disc, it is connected between two adjacent coupling discs by connecting line, impedance regulating is equipped in the connecting line, impedance regulating is by several impedance variable structure compositions.The utility model structure is more simple and compact, and function is more stable efficiently, reduces connecting line electrical length, improves bandstop filter performance, more meet performance of filter index, practicability is stronger.
Description
Technical field
The utility model relates to communication radio frequency technical fields, hinder more specifically to a kind of cavity band that performance is stable
Filter.
Background technique
It is well known that filter is widely used in various mobile communication system, for filtering out outside communication signal frequency
Clutter or interference signal.According to function classification, filter includes bandpass filter, bandstop filter, low-pass filter and high pass
Filter.Compare other filters, and bandstop filter has the characteristics that broadband, height inhibit, are low-loss.Existing bandstop filter
Coupling between cavity uses the connecting line of 50 ohm characteristic impedances, 1/4 stopband wavelength electrical length.With filter miniaturization
Development, filter construction is more and more closer, and limited space can not be laid out the connecting line for reaching 1/4 wavelength electrical length, and reduce
Connect line length bring the result is that performance of filter index reduction.
Therefore it provides a kind of cavity bandstop filter compact-sized, that performance is stable is actually necessary.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of performance is steady to solve above-mentioned the deficiencies in the prior art
Fixed cavity bandstop filter, structure is more simple and compact, and function is more stable efficiently, reduces connecting line electrical length, improves band
Performance of filter is hindered, more meets performance of filter index, practicability is stronger.
To achieve the above object, the technical scheme adopted by the utility model is
A kind of cavity bandstop filter that performance is stable, including filter cavity, cover board, microstripline plate, the cover board
Capping filter cavity forms multiple resonant cavities, resonant column is respectively set in the resonant cavity, the microstripline plate is located at lid
Between plate and filter cavity, the lower surface of the microstripline plate be equipped with signal output point, signal input point, coupling disc and
The resonant cavity of connecting line, the corresponding lower section of the coupling disc is arranged, and is connected between two adjacent coupling discs by connecting line, described
Impedance regulating is equipped in connecting line, impedance regulating is by several impedance variable structure compositions.
Further, the number of the impedance variable structure in single connecting line is 1.
Further, the number of the impedance variable structure in single connecting line is multiple.
Further, the line width of adjacent impedance variable structure is different.
Further, the electrical length of the single impedance variable structure is less than 1/4 stop-band frequency wavelength.
Further, the impedance of the impedance variable structure is high impedance or Low ESR.
Further, the cover board, filter cavity, microstripline plate cooperate between any two.
The beneficial effects of the utility model are:
In the utility model, impedance regulating is equipped in connecting line, impedance regulating is by several impedance variable knots
Structure composition, using impedance variable structure, effectively improves the standing wave index of filter in the case where same volume；Single connection
Impedance variable structure in line can be for 1 or multiple, then the wider impedance of connecting line is lower, and connecting line is narrower, and impedance is higher；
In addition, impedance variable structure is high impedance or Low ESR, by the impedance variations of microstripline plate connecting line, i.e., impedance is unified becomes
Height is uniformly lower, or first high low again, then is got higher by low, and then achieve the purpose that reduce electrical length.
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 the cross-sectional view of single resonant cavity；
Fig. 2 is the top view of filter cavity；
Fig. 3 is the structural schematic diagram of microstripline plate；
Fig. 4 is the structural schematic diagram of I part connecting line in Fig. 3；
Fig. 5 is the structural schematic diagram of II part connecting line in Fig. 3；
Fig. 6 is a kind of stable cavity bandstop filter of performance in embodiment using the utility model and does not apply this reality
The performance parameter schematic diagram surveyed with novel bandstop filter；
Marked in the figure: 1, filter cavity, 2, cover board, 3, microstripline plate, 4, resonant cavity, 5, resonant column, 6, signal it is defeated
Point out, 7, signal input point, 8, coupling disc, 9, connecting line, 10, impedance variable structure, 11, impedance regulating.
Specific embodiment
Specific embodiment is given below, the technical solution of the utility model is made further clear, complete, in detail
It is bright.The present embodiment is the most preferred embodiment premised on technical solutions of the utility model, but the protection scope of the utility model is not
It is limited to following embodiments.
As shown in Figs. 1-2, a kind of cavity bandstop filter that performance is stable, including filter cavity 1, cover board 2, microstrip line
Road plate 3, the cover board 2 cover filter cavity 1 and form multiple resonant cavities 4, and resonant column 5, institute are respectively set in the resonant cavity 4
It states microstripline plate 3 to be located between cover board 2 and filter cavity 1, as shown in figure 3, the lower surface of the microstripline plate 3 is laid with
There are signal output point 6, signal input point 7, coupling disc 8 and connecting line 9, the resonant cavity 4 of the corresponding lower section of the coupling disc 8 is arranged,
It is connected between two adjacent coupling discs 8 by connecting line 9, impedance regulating 11 is equipped in the connecting line 9, impedance is adjusted
Device 11 is made of several impedance variable structures 10, using impedance variable structure 10, is effectively changed in the case where same volume
The standing wave index of filter has been apt to it, so that more compact structure, performance is more stable.In addition, in the utility model, with regard to configuration aspects
For, the wider impedance of connecting line 9 is lower, and the narrower impedance of connecting line 9 is higher；
Further, it as shown in figure 4, the number of the impedance variable structure 10 in single connecting line 9 is 1, that is, is transformed to
The unified electrical length of impedance.
Further, as shown in figure 5, the number of the impedance variable structure 10 in single connecting line 9 is multiple.Pass through micro-strip
The impedance variations of 3 connecting line 9 of wiring board, i.e. impedance uniformly get higher or are uniformly lower, or first high low again, then are got higher by low, in turn
Achieve the purpose that reduce electrical length.
Further, as shown in figure 5, the number of the impedance variable structure 10 in single connecting line 9 is 4, adjacent resistance
The line width of anti-varistructure 10 is different.
Further, the electrical length of the single impedance variable structure 10 meets band resistance less than 1/4 stop-band frequency wavelength
The standard for the connecting line that coupling is used in filter cavity body, so that the more compact structure of bandstop filter, performance are more stable.
Further, the impedance of the impedance variable structure 10 is high impedance or Low ESR.It is connected by microstripline plate 3
The impedance variations of line 9, i.e. impedance uniformly get higher or are uniformly lower, or first high low again, then are got higher by low, and then it is long to reach reduction electricity
The purpose of degree.
Further, the cover board 2, filter cavity 1, microstripline plate 3 cooperate between any two, the size of three
It corresponds to each other.
It is illustrated in figure 6 in embodiment using a kind of stable cavity bandstop filter of performance of the utility model and does not answer
The performance parameter schematic diagram surveyed with the utility model bandstop filter, abscissa is frequency, unit MHz in figure；Ordinate
For signal amplitude, unit dB.Wherein, curve A is not apply the utility model bandstop filter, that is, being not used can with impedance
The bandstop filter test chart of the connecting line 9 of structure changes 10, curve B are a kind of stable cavity band resistance of performance of the utility model
Filter, i.e., using the bandstop filter test chart of the connecting line 9 with impedance variable structure 10.It is irised out from Fig. 6
As can be seen that the S11 index of the bandstop filter in curve B using the utility model greatly improves, S11 indicates echo damage for part
Consume characteristic；Then through compare can be clear and intuitive obtain, a kind of stable cavity bandstop filter of performance of the utility model, structure
More compact, performance is more stable, and practicability is stronger.
The advantages of main feature, basic principle and the utility model of the utility model has been shown and described above.This
Industry technology personnel are described in above embodiments and description it should be appreciated that the present utility model is not limited to the above embodiments
Only illustrate the principles of the present invention, on the premise of not departing from the spirit and scope of the utility model, the utility model is also
There can be various changes and modifications according to the actual situation, these changes and improvements both fall within the scope of the claimed invention
It is interior.The protection scope of the present invention is defined by the appended claims and their equivalents.
Claims (7)
1. a kind of cavity bandstop filter that performance is stable, including filter cavity (1), cover board (2), microstripline plate (3),
Be characterized in that: cover board (2) capping filter cavity (1) forms multiple resonant cavities (4), sets respectively in the resonant cavity (4)
It sets resonant column (5), the microstripline plate (3) is located between cover board (2) and filter cavity (1), the microstripline plate (3)
Lower surface be equipped with signal output point (6), signal input point (7), coupling disc (8) and connecting line (9), the coupling disc (8)
The resonant cavity (4) of corresponding lower section is arranged, and is connected between two adjacent coupling discs (8) by connecting line (9), the connecting line
(9) impedance regulating (11) are equipped in, impedance regulating (11) is made of several impedance variable structures (10).
2. a kind of stable cavity bandstop filter of performance according to claim 1, it is characterised in that: single connecting line
(9) number of the impedance variable structure (10) in is 1.
3. a kind of stable cavity bandstop filter of performance according to claim 1, it is characterised in that: single connecting line
(9) number of the impedance variable structure (10) in is multiple.
4. a kind of stable cavity bandstop filter of performance according to claim 3, it is characterised in that: adjacent impedance can
The line width of structure changes (10) is different.
5. a kind of stable cavity bandstop filter of performance according to claim 1, it is characterised in that: the single resistance
The electrical length of anti-varistructure (10) is less than 1/4 stop-band frequency wavelength.
6. a kind of stable cavity bandstop filter of performance according to claim 1, it is characterised in that: the impedance variable
The impedance of structure (10) is high impedance or Low ESR.
7. a kind of stable cavity bandstop filter of performance according to claim 1, it is characterised in that: the cover board (2),
Filter cavity (1), microstripline plate (3) cooperate between any two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820711620.XU CN208753482U (en) | 2018-05-14 | 2018-05-14 | A kind of cavity bandstop filter that performance is stable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820711620.XU CN208753482U (en) | 2018-05-14 | 2018-05-14 | A kind of cavity bandstop filter that performance is stable |
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| Publication Number | Publication Date |
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| CN208753482U true CN208753482U (en) | 2019-04-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113725575A (en) * | 2020-05-20 | 2021-11-30 | 大富科技(安徽)股份有限公司 | Communication equipment and filter |
-
2018
- 2018-05-14 CN CN201820711620.XU patent/CN208753482U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113725575A (en) * | 2020-05-20 | 2021-11-30 | 大富科技(安徽)股份有限公司 | Communication equipment and filter |
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