CN109786906A - A kind of filter based on coplanar waveguide transmission line - Google Patents
A kind of filter based on coplanar waveguide transmission line Download PDFInfo
- Publication number
- CN109786906A CN109786906A CN201910202632.9A CN201910202632A CN109786906A CN 109786906 A CN109786906 A CN 109786906A CN 201910202632 A CN201910202632 A CN 201910202632A CN 109786906 A CN109786906 A CN 109786906A
- Authority
- CN
- China
- Prior art keywords
- transmission line
- filter
- coplanar waveguide
- length
- line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a kind of filter based on coplanar waveguide transmission line, filter is by medium substrate, the first metal ground plane that medium substrate first surface is arranged in, the coplanar waveguide transmission line that the second metal ground plane of medium substrate second surface is arranged in and is arranged in the first metal ground plane form；Wherein, coplanar waveguide transmission line is symmetrical；Coplanar waveguide transmission line includes the sequentially connected first transmission line of head and the tail to the 7th transmission line, and the first end of first transmission line and the second end of the 7th transmission line are opened a way；First transmission line constitutes the resonator of a half wavelength to the 7th transmission line；Coplanar waveguide transmission line further includes the 8th transmission line and the 9th transmission line, and the first tie point in the first end and second transmission line of the 8th transmission line connects, and the first end of the 9th transmission line is connect with the second tie point on the 6th transmission line.Filter provided in an embodiment of the present invention has good low-pass filter characteristic, and area is small, at low cost.
Description
Technical field
The present invention relates to wave filter technology field more particularly to a kind of filters based on coplanar waveguide transmission line.
Background technique
Increasingly crowded with frequency spectrum resource, the direction of wireless communication system towards multiband and microwave small is developed,
And the filter with frequency-selecting effect is indispensable in entire wireless communication system, the development for also complying with wireless communication system becomes
Gesture develops towards multifrequency and chip.
Traditional filter is made of a series of lumped component (capacitor and inductance), when filter is applied to high frequency
When, cause the capacitor of filter and inductance that can generate ghost effect in high frequency since wavelength shortens, by lumped component institute
The filter of composition be applied to high frequency when with certain limitation, and at this time the size of capacitor and inductance also can not again by
Ignore, cause the area of filter larger, in addition, the higher cost of lumped component.
Summary of the invention
The technical problem to be solved by the embodiment of the invention is that providing a kind of filtering based on coplanar waveguide transmission line
Device has good low-pass filter characteristic, and area is small, at low cost.
In order to solve the above-mentioned technical problem, the embodiment of the invention provides a kind of filtering based on coplanar waveguide transmission line
Device, the filter by medium substrate, the first metal ground plane that the medium substrate first surface is set, be arranged described
Second metal ground plane of medium substrate second surface and the coplanar waveguide transmission line being arranged in first metal ground plane
Composition；Wherein, the coplanar waveguide transmission line is symmetrical；
The coplanar waveguide transmission line include the sequentially connected first transmission line of head and the tail, second transmission line, third transmission line,
4th transmission line, the 5th transmission line, the 6th transmission line and the 7th transmission line, and the first end of the first transmission line and described
The second end of seven transmission lines is opened a way；The first transmission line to the 7th transmission line constitutes the humorous of a half wavelength
Shake device；
The coplanar waveguide transmission line further includes the 8th transmission line and the 9th transmission line, the first end of the 8th transmission line
It is connect with the first tie point in the second transmission line, in the first end of the 9th transmission line and the 6th transmission line
The connection of second tie point；8th transmission line is the first feed-in line of the filter, and the 9th transmission line is the filter
Second feed-in line of wave device.
Further, the second transmission line is divided into first part and second part by first tie point, described
First part and the first transmission line constitute a quarter-wave first transmission zero；Wherein, the first part
It is connect with the first transmission line；
6th transmission line is divided into Part III and Part IV by second tie point, the Part IV and
7th transmission line constitutes quarter-wave second transmission zero；Wherein, the Part IV and the described 7th
Transmission line connection.
Further, the first transmission line, the third transmission line, the 5th transmission line and the 7th transmission line
Length be the first length；The length of the second transmission line, the 4th transmission line and the 6th transmission line is
Two length；The length of 8th transmission line and the 9th transmission line is third length.
Further, first length is 235mil, and second length is 90mil, and the third length is
100mil。
Further, the length of the first part is 89mil, and the length of the second part is 1mil；The third
Partial length is 1mil, and the length of the Part IV is 89mil.
Further, the impedance of the coplanar waveguide transmission line is 50 Ω, line width 10mil.
Further, the dielectric coefficient of the medium substrate is 4.4.
Further, the medium substrate with a thickness of 4mil.
Further, first metal ground plane and second metal ground plane are copper coating.
Further, the thickness of first metal ground plane and second metal ground plane is 1.5mil.
Compared with prior art, the embodiment of the invention provides a kind of filters based on coplanar waveguide transmission line, by being situated between
Matter substrate, the first metal ground plane that medium substrate first surface is set, the second gold medal that medium substrate second surface is set
Belong to ground plane and the coplanar waveguide transmission line being arranged in the first metal ground plane composition；Wherein, coplanar waveguide transmission line is in a left side
Right symmetrical, the first transmission line of coplanar waveguide transmission line constitutes the resonator of a half wavelength to the 7th transmission line, altogether
8th transmission line of coplanar waveguide transmission line and the 9th transmission line are respectively the first feed-in line and the second feed-in line of filter；The filter
Wave device has good low-pass filter characteristic, and area is small, at low cost.
Detailed description of the invention
Fig. 1 is a kind of structure of a preferred embodiment of filter based on coplanar waveguide transmission line provided by the invention
Schematic diagram；
Fig. 2 is a kind of size of a preferred embodiment of filter based on coplanar waveguide transmission line provided by the invention
Schematic diagram；
Fig. 3 is a kind of two-dimensional simulation result figure of filter based on coplanar waveguide transmission line provided by the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained all without creative efforts
Other embodiments shall fall within the protection scope of the present invention.
It is shown in Figure 1 the embodiment of the invention provides a kind of filter based on coplanar waveguide transmission line, it is the present invention
A kind of structural schematic diagram of one preferred embodiment of filter based on coplanar waveguide transmission line of offer, the filter by
Medium substrate 1, the first metal ground plane 2 that 1 first surface of medium substrate is arranged in, setting are in the medium substrate 1 the
Second metal ground plane 3 on two surfaces and the coplanar waveguide transmission line composition being arranged in first metal ground plane 2；Its
In, the coplanar waveguide transmission line is symmetrical；
The coplanar waveguide transmission line includes the sequentially connected first transmission line L1 of head and the tail, second transmission line L2, third biography
Defeated line L3, the 4th transmission line L4, the 5th transmission line L5, the 6th transmission line L6 and the 7th transmission line L7, and the first transmission line
The first end of L1 and the second end of the 7th transmission line L7 are opened a way；The first transmission line L1 to the 7th transmission line L7
Constitute the resonator of a half wavelength；
The coplanar waveguide transmission line further includes the 8th transmission line L8 and the 9th transmission line L9, the 8th transmission line L8's
First end is connect with the first tie point on the second transmission line L2, the first end and the described 6th of the 9th transmission line L9
The second tie point connection on transmission line L6；The 8th transmission line L8 be the filter the first feed-in line, the described 9th
Transmission line L9 is the second feed-in line of the filter.
Specifically, it is covered with the first metal ground plane 2 on the first surface (i.e. upper surface) of medium substrate 1, medium substrate 1
The second metal ground plane 3 is covered on second surface (i.e. lower surface), the first metal ground plane 2, medium substrate 1 and the second metal connect
Ground 3 is collectively referred to as the printed board of filter, and the setting of co-planar waveguide (Coplanar Waveguide, CPW) transmission line is being printed
The upper surface of plate, i.e. in the first metal ground plane 2, the structure for the filter being made of the defeated line of CPW is symmetrical.
CPW transmission line includes first transmission line L1, second transmission line L2, third transmission line L3, the 4th transmission line L4, the 5th
Transmission line L5, the 6th transmission line L6 and the 7th transmission line L7, the first end open circuit of first transmission line L1, the of first transmission line L1
Two ends are connect with the first end of second transmission line L2, and the second end of second transmission line L2 and the first end of third transmission line L3 connect
It connects, the second end of third transmission line L3 is connect with the first end of the 4th transmission line L4, the second end and the 5th of the 4th transmission line L4
The first end of transmission line L5 connects, and the second end of the 5th transmission line L5 is connect with the first end of the 6th transmission line L6, the 6th transmission
The second end of line L6 is connect with the first end of the 7th transmission line L7, the second end open circuit of the 7th transmission line L7, by first transmission line
L1 has connected and composed the resonator of a half wavelength to the 7th transmission line L7, represents the resonance frequency of filter passband
Rate, wherein selection half wavelength is to make electromagnetic wave generate standing wave to constitute resonator.
CPW transmission line further includes the 8th transmission line L8 and the 9th transmission line L9, the first end and second of the 8th transmission line L8
The first tie point connection on transmission line L2, the second end of the 8th transmission line L8 and the input terminal or output end of filter connect,
8th transmission line L8 is the first feed-in line of filter；The first end of 9th transmission line L9 and second on the 6th transmission line L6 connect
Contact connection, the second end of the 9th transmission line L9 and the output end or input terminal of filter connect, and the 9th transmission line L9 is filtering
Second feed-in line of device.
It should be noted that Fig. 1 show the top view of filter, display is the upper surface of printed board, and Fig. 1 institute
It is vertical connection (can be with the area of Optimal Filter) between each transmission line of the CPW transmission line shown, only transmission line connects
A kind of structural schematic diagram of preferred embodiment of relationship, the present invention are not especially limited the connection angle between each transmission line.
A kind of filter based on coplanar waveguide transmission line provided by the embodiment of the present invention is existed by medium substrate, setting
First metal ground plane of medium substrate first surface, the second metal ground plane and setting that medium substrate second surface is set
CPW transmission line composition in the first metal ground plane；Wherein, CPW transmission line is symmetrical, and the first of CPW transmission line passes
Defeated line constitutes the resonator of a half wavelength, the 8th transmission line of CPW transmission line and the 9th transmission to the 7th transmission line
Line is respectively the first feed-in line and the second feed-in line of filter；Compared to traditional lumped component filter, the filtering utensil
There is good low-pass filter characteristic, and area is small, it is at low cost, it can reduce the chance of electromagnetic interference, be more applicable for penetrating
Frequency microwave communication.
In addition, since the structure of CPW transmission line has the characteristics that flexible design degree and is easy to circuit integration design, it can be with
Adjust the design of filter by changing the layout of CPW transmission line, thus CPW transmission line be conducive to filter multifrequencyization and
The design of chip.
In a further advantageous embodiment, first tie point by the second transmission line L2 be divided into first part and
Second part, the first part and the first transmission line L1 constitute a quarter-wave first transmission zero；Its
In, the first part connect with the first transmission line L1；
The 6th transmission line L6 is divided into Part III and Part IV, the Part IV by second tie point
Quarter-wave second transmission zero is constituted with the 7th transmission line L7；Wherein, the Part IV with it is described
7th transmission line L7 connection.
Specifically, as shown in connection with fig. 1, second transmission line L2 is divided into two by the first tie point on second transmission line L2
Section, i.e., first part and second part, first part connect with first transmission line L1, and second part and third transmission line L3 connect
It connects, the transmission zero of a quarter-wave open circuit of filter has been connected and composed by first part and first transmission line L1
Point, i.e. first transmission zero；6th transmission line L6 is divided into two sections, i.e. third portion by the second tie point on the 6th transmission line L6
Divide and Part IV, Part III are connect with the 5th transmission line L5, Part IV is connect with the 7th transmission line L7, by Part IV
The transmission zero of another quarter-wave open circuit of filter, i.e., the second transmission have been connected and composed with the 7th transmission line L7
Zero point.
A kind of filter based on coplanar waveguide transmission line provided by the embodiment of the present invention, passes through two quarter-waves
Long open circuited transmission line forms two high frequency zeros, so that filter is in high frequency degree of suppression with higher.
It is shown in Figure 2, it is that one of a kind of filter based on coplanar waveguide transmission line provided by the invention is preferred real
The scale diagrams for applying example, in conjunction with above-described embodiment, the first transmission line L1, the third transmission line L3, the described 5th are passed
The length of defeated line L5 and the 7th transmission line L7 are the first length l1；The second transmission line L2, the 4th transmission line
The length of L4 and the 6th transmission line L6 are the second length l2；The 8th transmission line L8's and the 9th transmission line L9
Length is third length l3.
It should be understood that the size of filter are as follows: length * width=(l1+l3) * (3*l2), half wavelength it is humorous
The length (i.e. the length of the CPW transmission line of composition resonator) of vibration device is 4*l1+3*l2, wherein it should be noted that CPW is transmitted
Line itself has line width, clear in order to show, CPW transmission line shown in Fig. 2 has certain width, when size calculates, with
For the width of filter, the width of filter actually should be 3*l2+4* line width, still, since the line width of CPW transmission line is handed over
It is small, generally differ larger with the length of transmission line, therefore the line width of CPW transmission line can be ignored, it is believed that filter
Width is 3*l2, can similarly ignore line width elsewhere, repeat no more.
Preferably, first length is 235mil, and second length is 90mil, and the third length is
100mil。
In conjunction with above-described embodiment, the embodiment of the present invention defines the length parameter of each transmission line, i.e. l1=235mil, l2=
90mil, l3=100mil, the parameter are specially to design the low-pass filter institute of 2.4GHz based on coplanar waveguide transmission line a kind of
The parameter needed.
Preferably, the length of the first part is 89mil, and the length of the second part is 1mil；It is described
The length of Part III is 1mil, and the length of the Part IV is 89mil.
In conjunction with above-described embodiment, the embodiment of the present invention define the first part of second transmission line L2, second part and
The length parameter of the Part III of 6th transmission line L6, Part IV, the parameter are specially to result from the resonance point of filter
Parameter needed for 4.8GHz, the length for constituting the transmission line of the transmission zero of quarter-wave open circuit at this time is l1+l4=
235mil+89mil=324mil.
In another preferred embodiment, the impedance of the coplanar waveguide transmission line is 50 Ω, line width 10mil.
It should be noted that general line characteristic impedance all uses 50 Ω, reflection loss is not had.
Preferably, the dielectric coefficient of the medium substrate is 4.4.
Preferably, the medium substrate with a thickness of 4mil.
Preferably, first metal ground plane and second metal ground plane are copper coating.
Preferably, the thickness of first metal ground plane and second metal ground plane is 1.5mil.
Preferably, printed board with a thickness of 7mil.
In order to understand the filtering characteristic of the filter provided in an embodiment of the present invention based on coplanar waveguide transmission line, pass through
HFSS software carries out analog simulation to the filter of design, and specific simulation parameter setting is as shown in table 1:
1 filter simulation parameter table of table
| Name | Value | Unit |
| W | 10 | mil |
| D | 8 | mil |
| l1 | 235 | mil |
| l2 | 90 | mil |
| l3 | 100 | mil |
| l4 | 89 | mil |
| H | 7 | mil |
| u | 5.5 | mil |
| Hd | 1.5 | mil |
| Lc | 0.6 | mil |
| Rd | 9 | mil |
| B | 30 | mil |
| C | 30 | mil |
| C1 | 35 | mil |
| E | 12 | mil |
| K | -0.5 | mil |
The meaning of l1, l2, l3, l4 in table 1 are identical as the meaning of l1, l2, l3, l4 in above-described embodiment, in table 1
Required parameter setting when other parameters are simulation.
Filter is emulated according to the parameter setting in table 1, the two-dimensional simulation result accordingly obtained as shown in figure 3,
Abscissa indicates the working frequency of filter, and ordinate indicates the loss of filter, wherein curve S11 indicates return loss, bent
Line S21 indicates insertion loss, from the figure 3, it may be seen that return loss is less than -20dB when the working frequency of filter is 2.44GHz,
Insertion loss is -0.54dB, and therefore, which has good low-pass filter characteristic.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of filter based on coplanar waveguide transmission line, which is characterized in that the filter is by medium substrate, setting in institute
The second metal ground plane given an account of the first metal ground plane of matter substrate first surface, the medium substrate second surface is set
With the coplanar waveguide transmission line composition being arranged in first metal ground plane；Wherein, the coplanar waveguide transmission line is in a left side
It is right symmetrical；
The coplanar waveguide transmission line includes the sequentially connected first transmission line of head and the tail, second transmission line, third transmission line, the 4th
Transmission line, the 5th transmission line, the 6th transmission line and the 7th transmission line, and the first end of the first transmission line and the described 7th passes
The second end of defeated line is opened a way；The first transmission line constitutes the resonance of a half wavelength to the 7th transmission line
Device；
The coplanar waveguide transmission line further includes the 8th transmission line and the 9th transmission line, the first end of the 8th transmission line and institute
State the first tie point connection in second transmission line, first end and second on the 6th transmission line of the 9th transmission line
Tie point connection；8th transmission line is the first feed-in line of the filter, and the 9th transmission line is the filter
The second feed-in line.
2. as described in claim 1 based on the filter of coplanar waveguide transmission line, which is characterized in that first tie point will
The second transmission line is divided into first part and second part, and the first part and the first transmission line constitute one four
The first transmission zero of/mono- wavelength；Wherein, the first part connect with the first transmission line；
6th transmission line is divided into Part III and Part IV by second tie point, the Part IV and described
7th transmission line constitutes quarter-wave second transmission zero；Wherein, the Part IV and the 7th transmission
Line connection.
3. as claimed in claim 2 based on the filter of coplanar waveguide transmission line, which is characterized in that the first transmission line,
The length of the third transmission line, the 5th transmission line and the 7th transmission line is the first length；Second transmission
The length of line, the 4th transmission line and the 6th transmission line is the second length；8th transmission line and the described 9th
The length of transmission line is third length.
4. as claimed in claim 3 based on the filter of coplanar waveguide transmission line, which is characterized in that first length is
235mil, second length are 90mil, and the third length is 100mil.
5. as claimed in claim 4 based on the filter of coplanar waveguide transmission line, which is characterized in that the length of the first part
Degree is 89mil, and the length of the second part is 1mil；The length of the Part III is 1mil, the length of the Part IV
Degree is 89mil.
6. the filter as claimed in any one of claims 1 to 5 based on coplanar waveguide transmission line, which is characterized in that described total
The impedance of coplanar waveguide transmission line is 50 Ω, line width 10mil.
7. the filter as claimed in any one of claims 1 to 5 based on coplanar waveguide transmission line, which is characterized in that given an account of
The dielectric coefficient of matter substrate is 4.4.
8. the filter as claimed in any one of claims 1 to 5 based on coplanar waveguide transmission line, which is characterized in that given an account of
Matter substrate with a thickness of 4mil.
9. the filter as claimed in any one of claims 1 to 5 based on coplanar waveguide transmission line, which is characterized in that described
One metal ground plane and second metal ground plane are copper coating.
10. the filter as claimed in any one of claims 1 to 5 based on coplanar waveguide transmission line, which is characterized in that described
The thickness of one metal ground plane and second metal ground plane is 1.5mil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910202632.9A CN109786906B (en) | 2019-03-15 | 2019-03-15 | Filter based on coplanar waveguide transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910202632.9A CN109786906B (en) | 2019-03-15 | 2019-03-15 | Filter based on coplanar waveguide transmission line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109786906A true CN109786906A (en) | 2019-05-21 |
| CN109786906B CN109786906B (en) | 2020-05-22 |
Family
ID=66488298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910202632.9A Active CN109786906B (en) | 2019-03-15 | 2019-03-15 | Filter based on coplanar waveguide transmission line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109786906B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200718010A (en) * | 2005-10-21 | 2007-05-01 | Hon Hai Prec Ind Co Ltd | A low-pass filter |
| KR20070074393A (en) * | 2006-01-09 | 2007-07-12 | 삼성전자주식회사 | Parallel coupled cpw line filter |
| CN101043096A (en) * | 2006-03-22 | 2007-09-26 | 鸿富锦精密工业（深圳）有限公司 | Low-pass filter with wide cut-off bandwidth |
| TW200737583A (en) * | 2006-03-17 | 2007-10-01 | Hon Hai Prec Ind Co Ltd | Broad-band low-pass filter |
| CN205666302U (en) * | 2016-04-18 | 2016-10-26 | 六盘水师范学院 | Tippers etc. are from excimer type microwave filter |
| CN106785258A (en) * | 2016-11-29 | 2017-05-31 | 中国电子科技集团公司第二十九研究所 | A kind of Wide stop bands microstrip line low pass filter and method for designing |
| CN207923770U (en) * | 2017-12-18 | 2018-09-28 | 河南师范大学 | Novel electrical parameter measuring device based on coplanar waveguide transmission line |
-
2019
- 2019-03-15 CN CN201910202632.9A patent/CN109786906B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200718010A (en) * | 2005-10-21 | 2007-05-01 | Hon Hai Prec Ind Co Ltd | A low-pass filter |
| KR20070074393A (en) * | 2006-01-09 | 2007-07-12 | 삼성전자주식회사 | Parallel coupled cpw line filter |
| TW200737583A (en) * | 2006-03-17 | 2007-10-01 | Hon Hai Prec Ind Co Ltd | Broad-band low-pass filter |
| CN101043096A (en) * | 2006-03-22 | 2007-09-26 | 鸿富锦精密工业（深圳）有限公司 | Low-pass filter with wide cut-off bandwidth |
| CN205666302U (en) * | 2016-04-18 | 2016-10-26 | 六盘水师范学院 | Tippers etc. are from excimer type microwave filter |
| CN106785258A (en) * | 2016-11-29 | 2017-05-31 | 中国电子科技集团公司第二十九研究所 | A kind of Wide stop bands microstrip line low pass filter and method for designing |
| CN207923770U (en) * | 2017-12-18 | 2018-09-28 | 河南师范大学 | Novel electrical parameter measuring device based on coplanar waveguide transmission line |
Non-Patent Citations (2)
| Title |
|---|
| A.BOUTEJDAR ET AL: ""a simple tarnsformation of improved WLAN band pass to low pass filter using defected ground structure(DGS),defected microstrip structure (DMS) and multi-layer-technique"", 《JOURNALOF MICROWAVES,OPTOELECTRONICS AND ELECTROMAGNETIC APPLICATIONS》 * |
| 戴小伟等: ""一种高阻带抑制低通滤波器的设计"", 《微波学报》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109786906B (en) | 2020-05-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4523478B2 (en) | Band-pass filter, high-frequency module, and wireless communication device using the same | |
| US7592885B2 (en) | Stacked dielectric band-pass filter having a wider passband | |
| WO2002003494A1 (en) | Directional coupler and directional coupling method | |
| CN106997983A (en) | Directional coupler | |
| CN102610883A (en) | 90-MHz low-insertion-loss micro low pass filter | |
| CN103915666A (en) | Micro-strip double-pass-band filter | |
| CN109273807A (en) | A kind of novel four function filter-divider of high performance wideband | |
| CN103779640B (en) | Micro-band double-passband filter | |
| CN110247145B (en) | Bandwidth-adjustable broadband filtering balun with in-band good matching and isolation | |
| CN203760606U (en) | Microstrip dual-passband filter | |
| US8836451B2 (en) | Wideband high frequency bandpass filter | |
| CN109326855A (en) | A kind of novel four function filter-divider of broadband | |
| CN209641793U (en) | A kind of filter based on coplanar waveguide transmission line | |
| CN104409807B (en) | Coupling type cross-shaped resonator-based novel differential band-pass filter | |
| CN106450601A (en) | Coupling control-based LTCC filtering switch | |
| CN111540988A (en) | Ultra-thin flexible circuit bow tie artificial surface plasma microwave broadband band-pass filter | |
| JP2009177766A (en) | Filter circuit and filter circuit device, and multilayered circuit board, and circuit module each including the filter circuit | |
| CN109786906A (en) | A kind of filter based on coplanar waveguide transmission line | |
| CN104009271B (en) | A kind of plane bandpass filter based on cascade four resonators | |
| CN114094292A (en) | High-rejection LC band-pass filter | |
| CN108682926A (en) | A kind of highly selective dual-passband work(filter-divider | |
| CN201408829Y (en) | LTCC harmonic suppression band-pass filter | |
| US7489214B2 (en) | Low-pass filter | |
| JP4628262B2 (en) | Filter device | |
| CN203826525U (en) | Low pass filter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 5 / F, fulizhen building, No.1, Kefa Road, high tech park, Nanshan District, Shenzhen, Guangdong 518000 Patentee after: Shenzhen Lianzhou International Technology Co.,Ltd. Address before: 5 / F, fulizhen building, No.1, Kefa Road, high tech park, Nanshan District, Shenzhen, Guangdong 518000 Patentee before: SHENZHEN PUWEI TECHNOLOGY Co.,Ltd. |