CN206271847U - A kind of radio communication Wide stop bands open stub Microstrip Low-Pass - Google Patents
A kind of radio communication Wide stop bands open stub Microstrip Low-Pass Download PDFInfo
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- CN206271847U CN206271847U CN201621402713.1U CN201621402713U CN206271847U CN 206271847 U CN206271847 U CN 206271847U CN 201621402713 U CN201621402713 U CN 201621402713U CN 206271847 U CN206271847 U CN 206271847U
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- open stub
- low
- pass
- stop bands
- wide stop
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Abstract
The utility model discloses a kind of radio communication Wide stop bands open stub Microstrip Low-Pass, it is improved on the basis of original, the different open stub of several length is specifically inserted between vertical open stub, constitute multiple bandstop filter units, suppress the parasitic harmonic wave component in stopband, realize the global optimization of the miniaturization, low-loss and Wide stop bands performance of wave filter.It is the 3, optimization design of 4GHz low pass filters that the method can also be used for same type cut-off frequency.
Description
Technical field
The utility model is related to filter field, and more particularly to a kind of cut-off frequency is the Wide stop bands open circuit cutting back of 3.5GHz
Line Microstrip Low-Pass.
Background technology
Ripple is the carrier of the various information that modern society depends on for existence.Information needs to propagate, and what is leaned on is exactly waveform signal
Transmission.Signal it generation, conversion, transmission each link may be distorted due to the presence of environment and interference, very
To being that in quite a number of cases, this distortion is also very serious, so that signal and its entrained information are embedded in dearly
In the middle of noise.Wave filter is the device filtered to ripple, and low pass filter is for filtering high frequency waves signal, retaining low frequency
The device of ripple signal, Microstrip Low-Pass is one kind in the extensive filtering device of radio communication front end applications.
Traditional height impedance microstrip low pass filter and parallel branch line Microstrip Low-Pass has volume larger, slotting
Enter to be lost larger, stopband defect not wide enough.In order to obtain the low pass filter of low insertion loss, Wide stop bands performance, have at present
The method that extra transmission zero is obtained in filter stop bend by the structure for changing resonant element and coupling unit, to suppress
Harmonic wave parasitic passband, but this kind of method can increase the area of whole wave filter；Defect ground structure (DGS) unit sets in wave filter
There is preferable inhibition to harmonic wave using meeting on meter, while less wave filter volume is kept, but insertion loss is larger.Cause
This, designing can suppress harmonic wave parasitic passband, and the low pass filter of small volume, low insertion loss and Wide stop bands performance has in fact
Border meaning.
The micro-strip open stub low pass filter of prior art selects chebyshev function wave filter, according to full wave analysis
Software I E3D carries out certain structural adjustment, can obtain the design structure shown in Fig. 1, its transverse direction by 2*L0*W1,2*L1*W5,
2*L2*W5, L3*W5 totally 7 sections of transmission lines composition, vertical by 2*L4*W2,2*L5*W3,2*L6*W4 totally 6 sections of open stub structures
Into；During corresponding to 3.5GHz frequencies, as shown in table 1, simulation result is as shown in Figure 2 for the filter construction size.It can be seen that, wave filter
It is occur parasitic passband near 10GHz in 3 frequencys multiplication, intermediate zone is also not precipitous enough, and filter area reaches 33mm*11mm.
Table 1
Utility model content
The purpose of this utility model is to provide a kind of Wide stop bands open stub Microstrip Low-Pass, in suppression stopband
Parasitic harmonic wave component, realize that the entirety of the miniaturization, low-loss and Wide stop bands performance of radio communication front end low pass filter is excellent
Change.
In order to solve the above technical problems, the utility model is (see Fig. 1, chi in original open stub low pass filter
It is very little be shown in Table 1) on the basis of be improved.The transverse direction of original open stub low pass filter is by 2*L0*W1,2*L1*W5,2*
L2*W5, L3*W5 totally 7 sections of transmission lines composition, it is vertical that by 2*L4*W2,2*L5*W3,2*L6*W4, totally 6 sections of open stubs are constituted,
It is characterized in that between L4 and L5, between L5 and L6 and symmetrical centre is inserted into 5 different open stubs of length, constitute
Multiple bandstop filter units, its length is no more than former open stub length, and its width should be less than former open stub width；
And its all size is optimized, constitute a kind of Wide stop bands open stub Microstrip Low-Pass.
The utility model simple structure, it is easy to process.It is miniaturization, the low damage for being capable of achieving wave filter by simple technique
Consumption and Wide stop bands performance.The method can also be used for the low pass filter optimization design that same type cut-off frequency is 3,4GHz.
Brief description of the drawings
Fig. 1 is original open stub low-pass filter structure schematic diagram.
Fig. 2 is original open stub low pass filter simulation result.
Fig. 3 is Wide stop bands open stub Microstrip Low-Pass model after improving.
Fig. 4 is Wide stop bands open stub Microstrip Low-Pass structural representation after improving.
Fig. 5 is Wide stop bands open stub Microstrip Low-Pass simulation result after improving.
Specific embodiment
With reference to embodiment and accompanying drawing, the utility model is described in further detail.
Fig. 1 is original open stub low-pass filter structure schematic diagram, and wave filter substrate is used：ε=2.2, H=0.8,
Dimensional parameters numerical value is shown in Table 1.
It is occur parasitic passband near 10GHz in 3 frequencys multiplication such as Fig. 2, intermediate zone is also not precipitous enough, and filter area reaches
33mm*11mm。
Embodiment 1
The utility model has made following significant improvement on the basis of Fig. 1：Original open stub low pass filter is horizontal
To by 2*L0*W1,2*L1*W5,2*L2*W5, L3*W5 totally 7 sections of transmission lines constitute, it is vertical by 2*L4*W2,2*L5*W3,2*L6*
W4 totally 6 sections of open stubs compositions, between L4 and L5, between L5 and L6 and symmetrical centre is inserted into that 5 length is different to be opened
Short out transversal, constitutes multiple bandstop filter units, and its length is no more than former open stub length, and its width should be less than original and open
Short out transversal width；And its all size is optimized, constitute a kind of Wide stop bands open stub Microstrip Low-Pass.
Specific practice is to make an adjustment the spacing of L1, L2, L3, L4, L5, reduces the spacing of L1, L2, L3, L4, L5,
Increased the spacing of L3.The different open-end cutting back cable architecture of size is provided with each spacing.Wave filter after improvement
Physical dimension is shown in Fig. 3, wherein the width W5 of series connection microstrip transmission line is set to 0.4mm, wave filter substrate uses ε=2.2, H=
0.8。
When cut-off frequency is 3.5GHz, its specific size is shown in Fig. 4 to the utility model
Fig. 5 is the simulation result obtained by HFSS software emulations to the product of Fig. 4.It is improved low according to design result
Bandpass filter area reaches 27mm*11mm, than the open stub low pass filter volume-diminished 18% of original design, improves
The cut-off frequency of postfilter is 3.56GHz, and return loss is less than -28dB in passband, leads to in-band insertion loss and is less than 0.5dB, 5
The harmonics restraint of~18GHz stopband ranges is more than 30dB, meets the actual demand of radio communication front end low pass filter.
Claims (1)
1. a kind of radio communication Wide stop bands open stub Microstrip Low-Pass, original open stub low pass filter
Laterally by 2*L0*W1,2*L1*W5,2*L2*W5, L3*W5 totally 7 sections of transmission lines constitute, it is vertical by 2*L4*W2,2*L5*W3,2*
L6*W4 totally 6 sections of open stubs compositions, it is characterised in that between L4 and L5, between L5 and L6 and symmetrical centre is inserted into 5
The different open stub of length, constitutes multiple bandstop filter units, and its length is no more than former open stub length, and it is wide
Degree should be less than former open stub width；And its all size is optimized, constitute a kind of radio communication Wide stop bands open circuit short
Transversal Microstrip Low-Pass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621402713.1U CN206271847U (en) | 2016-12-20 | 2016-12-20 | A kind of radio communication Wide stop bands open stub Microstrip Low-Pass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621402713.1U CN206271847U (en) | 2016-12-20 | 2016-12-20 | A kind of radio communication Wide stop bands open stub Microstrip Low-Pass |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206271847U true CN206271847U (en) | 2017-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621402713.1U Expired - Fee Related CN206271847U (en) | 2016-12-20 | 2016-12-20 | A kind of radio communication Wide stop bands open stub Microstrip Low-Pass |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109411862A (en) * | 2018-10-25 | 2019-03-01 | 成都会讯科技有限公司 | The double detail parallel resonators of asymmetry open circuit and bandpass filter and design method |
| CN114256573A (en) * | 2021-12-22 | 2022-03-29 | 网络通信与安全紫金山实验室 | Microstrip low-pass filter and design method thereof |
| RU2798200C1 (en) * | 2022-12-26 | 2023-06-19 | Акционерное общество "Научно-исследовательский институт электромеханики" (АО "НИИЭМ") | Microstrip bandpass shf-filter |
-
2016
- 2016-12-20 CN CN201621402713.1U patent/CN206271847U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109411862A (en) * | 2018-10-25 | 2019-03-01 | 成都会讯科技有限公司 | The double detail parallel resonators of asymmetry open circuit and bandpass filter and design method |
| CN114256573A (en) * | 2021-12-22 | 2022-03-29 | 网络通信与安全紫金山实验室 | Microstrip low-pass filter and design method thereof |
| RU2798200C1 (en) * | 2022-12-26 | 2023-06-19 | Акционерное общество "Научно-исследовательский институт электромеханики" (АО "НИИЭМ") | Microstrip bandpass shf-filter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20170620 Termination date: 20171220 |