CN107394321A - Load the broadband band-pass filter of three minor matters coupled microstrip lines - Google Patents
Load the broadband band-pass filter of three minor matters coupled microstrip lines Download PDFInfo
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- CN107394321A CN107394321A CN201710489011.4A CN201710489011A CN107394321A CN 107394321 A CN107394321 A CN 107394321A CN 201710489011 A CN201710489011 A CN 201710489011A CN 107394321 A CN107394321 A CN 107394321A
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- microstrip line
- microstrip
- line
- pass filter
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20354—Non-comb or non-interdigital filters
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Abstract
The present invention provides a kind of broadband band-pass filter for loading three minor matters coupled microstrip lines, two first microstrip lines including being arranged on medium plate surface, two second microstrip lines, two the 3rd microstrip lines, two the 4th microstrip lines, two the 5th microstrip lines, two the 6th microstrip lines, two the 7th microstrip lines and two signal transmission end, the broadband band-pass filter is symmetrical on the first central axis, the broadband band-pass filter is symmetrical above and below on the second central axis, first central axis is the line at the midpoint of two horizontal frames up and down of the broadband band-pass filter, second central axis is the line at the midpoint of the two longitudinal frames in left and right of the broadband band-pass filter.Broadband band-pass filter of the present invention can be realized has high selectivity to passband signal, introduces less noise, avoids interfering radio-frequency front-end.
Description
Technical field
The present invention relates to technical field of micro communication, more particularly to a kind of broadband band logical for loading three minor matters coupled microstrip lines
Wave filter.
Background technology
A kind of critically important device of the wave filter as radio-frequency front-end, can filter out out-of-band noise, improve the spirit of circuit system
Sensitivity.Microstrip filter is a kind of device for separating different frequency microwave signal.Its main function is to suppress not needing
Signal, prevent it from by wave filter, only allowing the signal of needs to pass through.In microwave circuit system, the performance pair of wave filter
The performance indications of circuit system have a great impact.In general, wave filter is one to the performance of the selectivity of passband signal
Material impact index, and existing wave filter is poor to the selectivity of passband signal, causes the performance for influenceing whole communication system.
The content of the invention
It is an object of the invention to provide a kind of broadband band-pass filter for loading three minor matters coupled microstrip lines, it is intended to solves
The selectively poor technical problem of passband signal of the prior art.
To achieve the above object, the invention provides it is a kind of load three minor matters coupled microstrip lines broadband band-pass filter,
Including be arranged on two first microstrip lines of medium plate surface, two second microstrip lines, two the 3rd microstrip lines, two pieces it is the 4th micro-
Band line, two the 5th microstrip lines, two the 6th microstrip lines, two the 7th microstrip lines and two signal transmission end, the broadband band
Bandpass filter is symmetrical on the first central axis, and the broadband band-pass filter is symmetrical above and below on the second central axis,
First central axis for the midpoint of two horizontal frames up and down of the broadband band-pass filter line, in described second
Mandrel line is the line at the midpoint of the two longitudinal frames in left and right of the broadband band-pass filter, wherein：
Two first microstrip lines, two second microstrip lines, two the 3rd microstrip lines, two the 4th microstrip lines, two
5th microstrip line and two signal transmission end with first centerline axis parallel, two the 6th microstrip lines and two
Seven microstrip lines with second centerline axis parallel；
One end of every first microstrip line is connected with a signal output part, the other end of every first microstrip line and one
One end of second microstrip line and one end connection of the 3rd microstrip line, every 4th microstrip line are arranged at second microstrip line
And in the space formed between the 3rd microstrip line, one end of every 4th microstrip line and one end of the 5th microstrip line connect
Connect, the other end of the 5th microstrip line is connected with one end of another 5th microstrip line, and every 6th microstrip line one end vertically connects
The link position of two the 5th microstrip lines is connected to, is often connected with the other end of the 6th microstrip line and one end of the 7th microstrip line
Connect；And
Every second microstrip line and the 3rd microstrip line and a 4th microstrip line three minor matters coupled structures of formation, every
6th microstrip line and the 7th microstrip line form double minor matters matching open-circuited loads.
Preferably, the broadband band-pass filter of three minor matters coupled microstrip lines of the loading includes two double minor matters matching open circuits
Load and two three minor matters coupled structures.
Preferably, described two signal transmission end are respectively used to the input of signal and the output of signal, wherein, a signal
Transmission end is as signal input part, and another signal transmission end is as signal output part.
Preferably, first microstrip line, the second microstrip line, the 3rd microstrip line, the 4th microstrip line, the 5th microstrip line,
Six microstrip lines, the 7th microstrip line and signal transmission end are the metal copper sheet of strip structure.
Preferably, the length of first microstrip line be 10mm, width 1.66mm, second microstrip line and the 3rd micro-
Length with line is that 14.5mm, width are 0.21mm, and the length of the 4th microstrip line is 14.5mm, width is
0.12mm, the 4th microstrip line to the beeline between the second microstrip line are 0.18mm, the 4th microstrip line to the 3rd micro-strip
Beeline between line is 0.18mm, and the length of the 5th microstrip line is 11.5mm, width 2.88mm, the 6th microstrip line
Length be L4=12.9mm, width 0.38mm, the length of the 7th microstrip line is 10.8mm, width 2.78mm, the letter
The length of number transmission end is 10mm, width 1.66mm.
Preferably, the impedance of each first microstrip line is 50 Ω, each two, three, four microstrip lines collectively form one three
Coupled structure is saved, the odd mode characteristic impedance of each three minor matters coupled structure is 10 Ω, ever mode characteristic impedance is 8 Ω, electrical length is
90 degree, the impedance of each 5th microstrip line is 11 Ω, and the impedance of each 6th microstrip line is 10 Ω, the resistance of each 7th microstrip line
Resist for 12 Ω.
Preferably, the dielectric-slab is the pcb board that a kind of thickness of slab is 0.762mm, relative dielectric constant is 3.66.
Compared to prior art, the broadband band-pass filter of three minor matters coupled microstrip lines of loading of the present invention passes through design
Into two double minor matters matching open-circuited loads and two three minor matters coupled structures, there can be filtering performance in the microstrip line of script
On the basis of, realize has high selectivity to passband signal, introduces less noise, avoids interfering radio-frequency front-end.
Brief description of the drawings
Fig. 1 is the structural representation of the broadband band-pass filter preferred embodiment of the present invention three minor matters coupled microstrip lines of loading
Figure.
Fig. 2 is the circuit theory of the broadband band-pass filter preferred embodiment of the present invention three minor matters coupled microstrip lines of loading
Figure.
Fig. 3 is that the broadband band-pass filter of the present invention three minor matters coupled microstrip lines of loading is emulated by electromagnetic simulation software
S parameter result schematic diagram.
Embodiment
With reference to specific embodiment, the present invention is described in further detail, and following examples are the solutions to the present invention
Release, the invention is not limited in following examples.
Referring to figs. 1 to shown in 2, Fig. 1 is that the broadband band-pass filter of the present invention three minor matters coupled microstrip lines of loading is preferably real
Apply the structural representation of example；Fig. 2 is the broadband band-pass filter preferred embodiment of the present invention three minor matters coupled microstrip lines of loading
Circuit theory diagrams.
In the present embodiment, the broadband band-pass filter 1 of three minor matters coupled microstrip lines of the loading includes being arranged on medium
Two first microstrip lines, 101, two second microstrip lines, 102, two the 3rd microstrip lines, 103, two the 4th micro-strips on the surface of plate 100
Line 104, two the 5th microstrip lines, 105, two the 6th 106, two the 7th microstrip lines 107 of microstrip line and two signal transmission end
P1。
The broadband band-pass filter 1 of three minor matters coupled microstrip lines of the loading is on the first central axis (ab in Fig. 1
Line) it is symmetrical and symmetrical above and below on the second central axis (the cd lines in Fig. 1), first central axis is the width
The line (i.e. line a-b in Fig. 1) at the midpoint of two horizontal frames up and down with bandpass filter 1, second central axis
For the line (i.e. line c-d in Fig. 1) at the midpoint of the two longitudinal frames in left and right of the broadband band-pass filter 1, the first center
Axis is mutually perpendicular to the second central axis.
Further, two first microstrip lines, 101, two second microstrip lines, 102, two the 3rd microstrip lines 103, two
104, two the 5th microstrip lines 105 of the 4th microstrip line of root and two signal transmission end P1 are put down with two articles of horizontal frames up and down
OK, two articles of the left and right of two the 6th microstrip lines 106 and two the 7th microstrip lines 107 with the broadband band-pass filter 1
Vertical frame is parallel.
It should be noted that first central axis and the second central axis are in three minor matters coupled microstrip lines of the loading
Broadband band-pass filter 1 be not part that metal is formed, but when in order to produce or design, facilitate user will described in
Element on broadband band-pass filter 1 is (for example, two first microstrip lines, 101, two second microstrip lines, 102, two the 3rd micro-strips
Line 103, two the 4th microstrip lines, 104, two the 5th microstrip lines, 105, two the 6th microstrip lines, 106, two the 7th microstrip lines 107
And two signal transmission end P1) symmetrical on the first central axis and symmetrical above and below on the second central axis.When described
When broadband band-pass filter 1 works, the central axis can't participate in any operations such as signal filtering.In the present embodiment,
First central axis and the second central axis are to describe the left and right of broadband band-pass filter 1 and knot symmetrical above and below for convenience
Structure.
One end of every first microstrip line 101 is connected with a signal output part P1, every first microstrip line 101 it is another
Hold one end with one end of second microstrip line 102 and the 3rd microstrip line 103 to be connected, wherein, the second microstrip line 102 and
Space is provided between 3rd microstrip line 103, every 4th microstrip line 104 is arranged at second microstrip line 102 and one
In the space formed between three microstrip lines 103, one end of the 4th microstrip line 104 and one end of the 5th microstrip line 105 connect
Connect, the other end of the 5th microstrip line 105 is connected with one end of another 5th microstrip line 105, every 6th microstrip line 106 1
End is vertically connected at the link positions of two the 5th microstrip lines 105, often the 7th micro- with the other end of the 6th microstrip line 106 and one
One end connection with line 107.Wherein, every second microstrip line 102 and the 3rd microstrip line 103 and the 4th microstrip line
104 form three minor matters coupled structures 30, and every 6th microstrip line 106 and the 7th microstrip line 107 form double minor matters matchings and opened
Road load 20.From Fig. 1 and Fig. 2 can be seen that the broadband band-pass filter 1 include two double minor matters matching open-circuited loads 20 and
Two three minor matters coupled structures 30.
The dielectric-slab 100 is a kind of pcb board, and specific sheet material type is Roger RO4350B, wherein relative dielectric is normal
Number is 3.66, thickness of slab 0.762mm.
In the present embodiment, the first microstrip line 101, the second microstrip line 102, the 3rd microstrip line 103, the 4th microstrip line 104,
5th microstrip line 105, the 6th microstrip line 106, the 7th microstrip line 107 and signal transmission end P1 are the metallic copper of strip structure
Piece.The broadband band-pass filter of three minor matters coupled microstrip lines of loading of the present invention is relative to existing bandpass filter, by changing
Become the length and width of microstrip line, the broadband band-pass filter 1 of three minor matters coupled microstrip lines of loading of the present invention can be made to exist
Reach good matching effect in working frequency range.
In the present embodiment, the working band of the broadband band-pass filter 1 is in 1.99GHz-4.72GHz, by specific
Embodiment come illustrate to be arranged on first microstrip line 101 on the surface of dielectric-slab 100, the second microstrip line 102, the 3rd microstrip line 103,
4th microstrip line 104, the 5th microstrip line 105, the 6th microstrip line 106, the 7th microstrip line 107 and signal transmission end P1 length and
Width.
Specifically, as shown in Figure 1：
The length of first microstrip line 101 is L=10mm, and the width of the first microstrip line 101 is W=1.66mm.
The length of second microstrip line 102 and the 3rd microstrip line 103 is identical, is L1=14.5mm, the second microstrip line 102 and
The width of 3rd microstrip line is identical, is W1=0.21mm.
The length of 4th microstrip line 104 is L1=14.5mm, and the width of the 4th microstrip line is W2=0.12mm, the 4th micro-strip
Beeline between the microstrip line of line 104 to the second 102 is S1=0.18mm, the microstrip line 103 of the 4th microstrip line 104 to the 3rd it
Between beeline be S1=0.18mm.
The length of 5th microstrip line 105 is L3=11.5mm, and the width of the 5th microstrip line 105 is W3=2.88mm.
The length of 6th microstrip line 106 is L4=12.9mm, and the width of the 6th microstrip line 106 is W4=0.38mm.
The length of 7th microstrip line 107 is L5=10.8mm, and the width of the 7th microstrip line 107 is W5=2.78mm.
Signal transmission end P1 length is L0=10mm, and signal transmission end P1 width is W0=1.66mm.
It should be noted that the metal copper thickness being arranged on pcb board is generally um levels, therefore the present invention is not to the
One microstrip line 101, the second microstrip line 102, the 3rd microstrip line 103, the 4th microstrip line 104, the 5th microstrip line 105, the 6th micro-strip
The metal copper thickness of the length and width of line 106, the 7th microstrip line 107 and signal transmission end P1 is any limitation as, and is had no effect on
The characteristic of the broadband band-pass filter of three minor matters coupled microstrip lines of loading of the present invention.In addition, two P1 points of signal transmission end
Not Yong Yu the input of signal and the output of signal, wherein, a signal transmission end P1 is as signal input part, another signal
Transmission end P1 is as signal output part.Further, signal input part can be the signal transmission end P1 on the left side in Fig. 1, also may be used
Be the right signal transmission end P1；Signal output part can be signal transmission end P1 or the right on the left side in Fig. 1
Signal transmission end P1.For example, if the signal transmission end P1 on the left side is as signal input part in Fig. 1, the signal on the right passes in Fig. 1
Defeated end P1 enters as signal output part, signal from the signal transmission end P1 on the left side, is exported from the signal transmission end P1 on the right.If
The signal transmission end P1 on the left side is as signal output part in Fig. 1, then the signal transmission end P1 on the right inputs as signal in Fig. 1
End, signal enter from the signal transmission end P1 on the right, are exported from the signal transmission end P1 on the left side.
In the present embodiment, the impedance of each first microstrip line is 50 Ω, each two, three, four microstrip lines collectively form one
Individual three minor matters coupled structure, the odd mode characteristic impedance of each three minor matters coupled structure is 10 Ω, ever mode characteristic impedance is 8 Ω, electricity
Length is 90 degree, and the impedance of each 5th microstrip line is 11 Ω, and the impedance of each 6th microstrip line is 10 Ω, each 7th micro-strip
The impedance of line is 12 Ω.
The broadband band-pass filter of three minor matters coupled microstrip lines of loading of the present invention is by being designed to two double minor matters
Match open-circuited load 20 and two three minor matters coupled structures 30, it is possible to achieve in particular job frequency band so that the micro-strip of script
Line has filtering performance, has high selectivity to passband signal, introduces less noise, avoids interfering radio-frequency front-end.
With reference to shown in figure 3, Fig. 3 is that the broadband band-pass filter of the present invention three minor matters coupled microstrip lines of loading is imitated by electromagnetism
The S parameter result schematic diagram of true software emulation.
From figure 3, it can be seen that the broadband band-pass filter 1 of three minor matters coupled microstrip lines of the loading is in working band
1.99GHz-4.72GHz (in Fig. 3 | S11 | frequency range corresponding to curve ordinate -10dB), there is 81.37% [(4.72-
1.99)/(0.5* (4.72+1.99))] relative bandwidth, that is to say, that using the present invention structure have broader opposite band
It is wide.Meanwhile when the frequency of working band is 1.28GHz, reflectance factor (i.e. in Fig. 3 | S11 |) -67dB can be reached,
When the frequency of working band is 6.5GHz, transmission coefficient (i.e. in Fig. 3 | S21 |) it is -95dB, from figure 3, it can be seen that described
The passband signal of broadband band-pass filter 1 has high selectivity.It follows that the minor matters coupled microstrip line of loading three of the present invention
Broadband band-pass filter can have high selectivity, and broader relative bandwidth to passband signal, introduce less noise, avoid pair
Radio-frequency front-end interferes.
The broadband band-pass filter of three minor matters coupled microstrip lines of loading of the present invention includes two double minor matters matching open circuits
Load 20 and two three minor matters coupled structures 30 so that the microstrip line of script with the basis of filtering performance with higher band
Logical selectivity.
The preferred embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (7)
1. a kind of broadband band-pass filter for loading three minor matters coupled microstrip lines, it is characterised in that including being arranged on dielectric-slab table
Two first microstrip lines in face, two second microstrip lines, two the 3rd microstrip lines, two the 4th microstrip lines, two the 5th micro-strips
Line, two the 6th microstrip lines, two the 7th microstrip lines and two signal transmission end, the broadband band-pass filter is in first
Mandrel line is symmetrical, and the broadband band-pass filter is symmetrical above and below on the second central axis, and first central axis is
The line at the midpoint of two horizontal frames up and down of the broadband band-pass filter, second central axis are the broadband band
The line at the midpoint of the two longitudinal frames in left and right of bandpass filter, wherein：
Two first microstrip lines, two second microstrip lines, two the 3rd microstrip lines, two the 4th microstrip lines, two pieces the 5th
Microstrip line and two signal transmission end with first centerline axis parallel, two the 6th microstrip lines and two it is the 7th micro-
Band line with second centerline axis parallel；
One end of every first microstrip line is connected with a signal output part, the other end of every first microstrip line and one second
One end of microstrip line and one end connection of the 3rd microstrip line, every 4th microstrip line are arranged at second microstrip line and one
In the space formed between the microstrip line of root the 3rd, one end of every 4th microstrip line is connected with one end of the 5th microstrip line,
The other end of 5th microstrip line is connected with one end of another 5th microstrip line, and every 6th microstrip line one end is vertically connected at
The link position of two the 5th microstrip lines, often the other end with the 6th microstrip line be connected with one end of the 7th microstrip line；And
Every second microstrip line and the 3rd microstrip line and a 4th microstrip line three minor matters coupled structures of formation, every 6th
Microstrip line and the 7th microstrip line form double minor matters matching open-circuited loads.
2. the broadband band-pass filter of three minor matters coupled microstrip lines of loading according to claim 1, it is characterised in that described
Loading the broadband band-pass filter of three minor matters coupled microstrip lines includes two double minor matters matching open-circuited loads and two three minor matters couplings
Close structure.
3. the broadband band-pass filter of three minor matters coupled microstrip lines of loading according to claim 1, it is characterised in that described
Two signal transmission end are respectively used to the input of signal and the output of signal, wherein, a signal transmission end inputs as signal
End, another signal transmission end is as signal output part.
4. the broadband band-pass filter of three minor matters coupled microstrip lines of loading according to claim 1, it is characterised in that described
First microstrip line, the second microstrip line, the 3rd microstrip line, the 4th microstrip line, the 5th microstrip line, the 6th microstrip line, the 7th microstrip line
And signal transmission end is the metal copper sheet of strip structure.
5. the broadband band-pass filter of three minor matters coupled microstrip lines of loading according to claim 1, it is characterised in that described
The length of first microstrip line is 10mm, width 1.66mm, and the length of second microstrip line and the 3rd microstrip line is
14.5mm, width are 0.21mm, and the length of the 4th microstrip line is 14.5mm, width 0.12mm, the 4th micro-strip
Line to the beeline between the second microstrip line is 0.18mm, and the 4th microstrip line to the beeline between the 3rd microstrip line is
0.18mm, the length of the 5th microstrip line is 11.5mm, width 2.88mm, and the length of the 6th microstrip line is L4=
12.9mm, width 0.38mm, the length of the 7th microstrip line is 10.8mm, width 2.78mm, the length of the signal transmission end
Spend for 10mm, width 1.66mm.
6. the broadband band-pass filter of three minor matters coupled microstrip lines of loading according to claim 1, it is characterised in that each
The impedance of first microstrip line is 50 Ω, each two, three, four microstrip lines collectively form a three minor matters coupled structures, each three
The odd mode characteristic impedance for saving coupled structure is 10 Ω, ever mode characteristic impedance is 8 Ω, electrical length is 90 degree, each 5th microstrip line
Impedance be 11 Ω, the impedance of each 6th microstrip line is 10 Ω, and the impedance of each 7th microstrip line is 12 Ω.
7. the broadband band-pass filter of the minor matters coupled microstrip line of loading three according to any one of claim 1 to 6, its feature
It is, the dielectric-slab is the pcb board that a kind of thickness of slab is 0.762mm, relative dielectric constant is 3.66.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710489011.4A CN107394321A (en) | 2017-06-23 | 2017-06-23 | Load the broadband band-pass filter of three minor matters coupled microstrip lines |
| PCT/CN2017/114057 WO2018233227A1 (en) | 2017-06-23 | 2017-11-30 | Broadband bandpass filter loaded with three-branch coupled micro-strip line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710489011.4A CN107394321A (en) | 2017-06-23 | 2017-06-23 | Load the broadband band-pass filter of three minor matters coupled microstrip lines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107394321A true CN107394321A (en) | 2017-11-24 |
Family
ID=60332113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710489011.4A Pending CN107394321A (en) | 2017-06-23 | 2017-06-23 | Load the broadband band-pass filter of three minor matters coupled microstrip lines |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107394321A (en) |
| WO (1) | WO2018233227A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018233227A1 (en) * | 2017-06-23 | 2018-12-27 | 深圳市景程信息科技有限公司 | Broadband bandpass filter loaded with three-branch coupled micro-strip line |
| WO2018233230A1 (en) * | 2017-06-23 | 2018-12-27 | 深圳市景程信息科技有限公司 | Broadband bandpass filter with widened relative bandwidth |
| CN109768384A (en) * | 2019-01-23 | 2019-05-17 | 西安电子科技大学 | Based on odd mould artificial surface phasmon broadband end-on-fire antenna, wireless communication system |
| CN111463527A (en) * | 2020-03-05 | 2020-07-28 | 东北大学秦皇岛分校 | Dual-band-pass filter based on unequal-length cross-shaped resonator and design method |
| CN111490321A (en) * | 2020-03-05 | 2020-08-04 | 东北大学秦皇岛分校 | Broadband filter based on improved cross-shaped structure and design method |
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| CN101694899A (en) * | 2009-10-16 | 2010-04-14 | 电子科技大学 | Microstrip bandpass filter with sector open-circuit structure |
| CN101950827A (en) * | 2010-09-06 | 2011-01-19 | 华东交通大学 | Branch node loaded ultra wideband microwave filter |
| CN102544652A (en) * | 2012-01-18 | 2012-07-04 | 华南理工大学 | Ultra-wide-band filter with high selectivity and ultrahigh attenuation band restrain effect |
| CN104733813A (en) * | 2015-03-16 | 2015-06-24 | 华南理工大学 | Broadband bandpass filter with frequency and bandwidth reconfigurable |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394321A (en) * | 2017-06-23 | 2017-11-24 | 深圳市景程信息科技有限公司 | Load the broadband band-pass filter of three minor matters coupled microstrip lines |
| CN107395223A (en) * | 2017-06-23 | 2017-11-24 | 深圳市景程信息科技有限公司 | Sender unit with the coupling of three minor matters and double minor matters matching microstrip line construction |
| CN107395224A (en) * | 2017-06-23 | 2017-11-24 | 深圳市景程信息科技有限公司 | Sender unit with three minor matters coupling microstrip cable architectures of loading |
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- 2017-11-30 WO PCT/CN2017/114057 patent/WO2018233227A1/en active Application Filing
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|---|---|---|---|---|
| CN101694899A (en) * | 2009-10-16 | 2010-04-14 | 电子科技大学 | Microstrip bandpass filter with sector open-circuit structure |
| CN101950827A (en) * | 2010-09-06 | 2011-01-19 | 华东交通大学 | Branch node loaded ultra wideband microwave filter |
| CN102544652A (en) * | 2012-01-18 | 2012-07-04 | 华南理工大学 | Ultra-wide-band filter with high selectivity and ultrahigh attenuation band restrain effect |
| CN104733813A (en) * | 2015-03-16 | 2015-06-24 | 华南理工大学 | Broadband bandpass filter with frequency and bandwidth reconfigurable |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018233227A1 (en) * | 2017-06-23 | 2018-12-27 | 深圳市景程信息科技有限公司 | Broadband bandpass filter loaded with three-branch coupled micro-strip line |
| WO2018233230A1 (en) * | 2017-06-23 | 2018-12-27 | 深圳市景程信息科技有限公司 | Broadband bandpass filter with widened relative bandwidth |
| CN109768384A (en) * | 2019-01-23 | 2019-05-17 | 西安电子科技大学 | Based on odd mould artificial surface phasmon broadband end-on-fire antenna, wireless communication system |
| CN111463527A (en) * | 2020-03-05 | 2020-07-28 | 东北大学秦皇岛分校 | Dual-band-pass filter based on unequal-length cross-shaped resonator and design method |
| CN111490321A (en) * | 2020-03-05 | 2020-08-04 | 东北大学秦皇岛分校 | Broadband filter based on improved cross-shaped structure and design method |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018233227A1 (en) | 2018-12-27 |
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Application publication date: 20171124 |