CN206564311U - The plane bandpass filter that a kind of Wide stop bands suppress - Google Patents
The plane bandpass filter that a kind of Wide stop bands suppress Download PDFInfo
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- CN206564311U CN206564311U CN201720020712.9U CN201720020712U CN206564311U CN 206564311 U CN206564311 U CN 206564311U CN 201720020712 U CN201720020712 U CN 201720020712U CN 206564311 U CN206564311 U CN 206564311U
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- bandpass filter
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Abstract
The utility model discloses the plane bandpass filter that a kind of Wide stop bands suppress, including input port, output port and four resonators cascaded successively, respectively first, second, third, fourth resonator, wherein the first, the 4th resonator is the wave resonator of uniform impedance 1/2nd, second, third resonator is uniform impedance quarter-wave resonance device, this four resonators that cascade successively are by parallel coupling, and the transmission zero produced by coupling line with stub suppresses to parasitic passband；The feeder line parallel coupling of the input port is in the side of the first resonator, and the feeder line parallel coupling of the output port is in the side of the 4th resonator.The utility model can be realized simultaneously to be suppressed to multiple parasitic frequency bands, and then realize the characteristic of ultra-wide stopband, there is simple and reliable for structure, low manufacture cost, more flexible selectivity, small volume is disclosure satisfy that, the fast, design requirement of the bandpass filter of good performance of ultra-wide stopband of roll-offing.
Description
Technical field
The utility model is related to the technical field of high-frequency element, refers in particular to the plane bandpass filtering that a kind of Wide stop bands suppress
Device.
Background technology
Recently as developing rapidly for wireless communication technology, increasing microwave frequency resource is made by communication system
With, spatial electromagnetic frequency spectrum is more and more intensive, so that the frequency interferences between different wireless communication systems are increasingly severe,
In a wireless communication system, bandpass filter is important part.The performance of its stopband is determined in whole communication system
The degree of frequency interferences.In order to effectively suppress interference signal, Wide stop bands wave filter turns into what is studied in current microwave regime
One of focus.
In order to design small volume, with internal loss is small, fast, the ultra-wide stopband that roll-offs bandpass filter of good performance, learn
Persons propose many new resonator structures, and some of which shows good performance really, such as in order to realize wide resistance
Band rejection characteristic, often raises the first undesire frequency using the slotting capacitance resonance machine, step impedance resonator of referring to, makes parasitic passband remote
Working passband, so as to increase the frequency range of stopband；Or transmission zero is introduced using defect ground structure, suppress parasitic passband
Intensity, so as to improve the degree of suppression in the range of Wide stop bands.Owed however, above measure is showed in terms of some parasitic passbands are suppressed
It is good.
The content of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, it is proposed that the plane band logical that a kind of Wide stop bands suppress
Wave filter, can simultaneously realize and multiple parasitic frequency bands are suppressed, and then realize the characteristic of ultra-wide stopband；With it is simple in construction can
Lean on, low manufacture cost, more flexible selectivity the advantages of, disclosure satisfy that small volume, the of good performance of fast, ultra-wide stopband of roll-offing
The design requirement of bandpass filter, it is adaptable to plurality of communication systems and industrialized production.
To achieve the above object, technical scheme provided by the utility model is：The plane band logical that a kind of Wide stop bands suppress
Wave filter, including input port, output port and four resonators cascaded successively, respectively first, second, third, fourth
Resonator, wherein the first, the 4th resonator are the wave resonator of uniform impedance 1/2nd, and second, third resonator is
Uniform impedance quarter-wave resonance device, this four resonators that cascade successively by parallel coupling, by coupling line with it is short
The transmission zero that transversal is produced suppresses to parasitic passband；The feeder line parallel coupling of the input port is in the first resonator
Side, the feeder line parallel coupling of the output port is in the side of the 4th resonator.
One end bending l-shaped of the wave resonator of uniform impedance 1/2nd, the other end bends to U-shaped, coupling spy
Property is mainly determined by the stub of L-type and the length of coupling line and coupling position；The uniform impedance quarter-wave resonance
One end bending l-shaped of device, the other end is short-circuit line, and coupled characteristic is mainly by the stub lengths of L-type, Coupled Line Length of Band and coupling
Position is closed to determine；The feeder line of the input port and output port is not fed mutually with open end, the pars intermedia split-phase with resonator
Mutual coupling.
The input port and output port are 50 ohm of impedance matching.
The utility model compared with prior art, has the following advantages that and beneficial effect：
1st, the length of parallel coupled line and stub between the utility model is by adjusting each resonator, is set multiple
Transmission zero, and then realize the characteristic of ultra-wide stopband.
2nd, the utility model structure is realized equal using the open-circuit line and quarter-wave short-circuit line of 1/2nd wavelength
Even electric impedance resonator, in addition by many places folded bent, has greatly reduced the size of wave filter.Whole design structure is simple, special
Property good, and cost of manufacture bottom, plurality of communication systems can be effectively used in, be adapted to industrialized mass production.
Brief description of the drawings
Fig. 1 is the structural representation of plane bandpass filter of the present utility model.
Fig. 2 is the scattering parameter simulation result figure of plane bandpass filter of the present utility model.
Fig. 3 is Fig. 2 partial schematic diagram.
Embodiment
With reference to specific embodiment, the utility model is described in further detail.
Shown in Figure 1, the plane bandpass filter integral manufacturing that the present embodiment is provided is in double-sided copper-clad micro-strip medium
Being made respectively on plate 7, on the same face of dielectric-slab 7 has input port Port1, for feed-in electromagnetic wave signal, output port
Port2, for feeding out electromagnetic wave signal, four resonators for cascading successively, respectively first, second, third, fourth resonator
2、3、4、5.The another side of dielectric-slab 7 is to cover copper earth plate.Wherein the first, the 4th resonator 2,5 be uniform impedance two/
One wave resonator, second, third resonator is uniform impedance quarter-wave resonance device 3,4, and this four cascade successively
Resonator by parallel coupling, the transmission zero produced by coupling line with stub suppresses to parasitic passband.Uniformly
One end bending l-shaped of the wave resonator of impedance 1/2nd, the other end bends to U-shaped, and coupled characteristic is mainly by the cutting back of L-type
The length and coupling position of line and coupling line are determined；One end bending l-shaped of uniform impedance quarter-wave resonance device, it is another
Hold as short-circuit line, coupled characteristic is mainly determined by the stub lengths of L-type, Coupled Line Length of Band and coupling position；8 and 9 are in figure
Grounding through hole is short-circuit end, it is necessary to be connected with scolding tin with covering copper earth plate.The input port Port1 parallel coupling of feeder line 1 exists
The side of first resonator 2, the output port Port2 parallel coupling of feeder line 6 is in the side of the 4th resonator 5, input port
Port1 feeder line 2 and output port Port2 feeder line 6 are not fed mutually with open end, the center section phase mutual coupling with resonator
Conjunction, input port Port1 and output port Port2 are 50 ohm of impedance matching.
It is shown in Figure 2, illustrate the scattering parameter simulation result of the above-mentioned plane bandpass filter of the present embodiment, its center
Frequency is 1Ghz, and transverse axis represents the signal frequency of plane bandpass filter, and the longitudinal axis represents amplitude, including insertion loss S21Amplitude
With return loss S11Amplitude, wherein S11Represent Port1 return loss, S21Represent Port1 and Port2 insertion loss.Insert
Enter the relation between the input power of loss one signal of expression and the power output of another port signal, its corresponding mathematics
Function is：Power output/input power (dB)=20*log | S21|.In the signal transmission of the plane bandpass filter of the present embodiment
During, the Partial Power of signal is reflected back toward signal source, and the power reflected turns into reflection power.Return loss represents the end
Relation between the input power of message number and the reflection power of signal, its corresponding mathematical function is as follows：Reflection power/incidence
Power (dB)=20*log | S11|.From Fig. 2 and Fig. 3, the centre frequency of the plane bandpass filter of the present embodiment is 1Ghz,
Logical in-band insertion loss absolute value is less than 3dB, and return loss absolute value is more than 15dB, and passband internal characteristic is very good.- 20dB stopbands
Suppress since 1.1Ghz, highest has exceeded 16.5Ghz, and -19.6dB stopbands suppress to be even more to have exceeded 20dB, and parasitic passband is obtained
Good suppression is arrived, band external characteristics characteristic is satisfactory.
Embodiment described above is only the preferred embodiment of the utility model, not limits implementation of the present utility model with this
Scope, therefore the change that all shape, principles according to the utility model are made, all should cover in protection domain of the present utility model.
Claims (3)
1. the plane bandpass filter that a kind of Wide stop bands suppress, it is characterised in that：Including input port, output port and four according to
The resonator of secondary cascade, respectively first, second, third, fourth resonator, wherein the first, the 4th resonator are uniform resistance
Anti- 1/2nd wave resonators, second, third resonator is uniform impedance quarter-wave resonance device, and this four successively
The resonator of cascade is by parallel coupling, and the transmission zero produced by coupling line with stub suppresses to parasitic passband；
The feeder line parallel coupling of the input port is in the side of the first resonator, and the feeder line parallel coupling of the output port is the 4th
The side of resonator.
2. the plane bandpass filter that a kind of Wide stop bands according to claim 1 suppress, it is characterised in that：The uniform resistance
One end bending l-shaped of anti-1/2nd wave resonators, the other end bends to U-shaped；The uniform impedance quarter-wave
One end bending l-shaped of resonator, the other end is short-circuit line；The feeder line of the input port and output port not with open end phase
Feed, intercouples with the center section of resonator.
3. the plane bandpass filter that a kind of Wide stop bands according to claim 1 suppress, it is characterised in that：The input
Mouth and output port are 50 ohm of impedance matching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720020712.9U CN206564311U (en) | 2017-01-09 | 2017-01-09 | The plane bandpass filter that a kind of Wide stop bands suppress |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720020712.9U CN206564311U (en) | 2017-01-09 | 2017-01-09 | The plane bandpass filter that a kind of Wide stop bands suppress |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206564311U true CN206564311U (en) | 2017-10-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720020712.9U Expired - Fee Related CN206564311U (en) | 2017-01-09 | 2017-01-09 | The plane bandpass filter that a kind of Wide stop bands suppress |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602187A (en) * | 2017-01-09 | 2017-04-26 | 华南理工大学 | Planar band-pass filter with wide stop-band suppression |
| CN110970695A (en) * | 2018-10-01 | 2020-04-07 | Tdk株式会社 | Band-pass filter |
-
2017
- 2017-01-09 CN CN201720020712.9U patent/CN206564311U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602187A (en) * | 2017-01-09 | 2017-04-26 | 华南理工大学 | Planar band-pass filter with wide stop-band suppression |
| CN110970695A (en) * | 2018-10-01 | 2020-04-07 | Tdk株式会社 | Band-pass filter |
| CN110970695B (en) * | 2018-10-01 | 2021-08-13 | Tdk株式会社 | Band-pass filter |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171017 Termination date: 20200109 |