CN103929142B - Lamination sheet type low pass filter for CATV - Google Patents
Lamination sheet type low pass filter for CATV Download PDFInfo
- Publication number
- CN103929142B CN103929142B CN201410133398.6A CN201410133398A CN103929142B CN 103929142 B CN103929142 B CN 103929142B CN 201410133398 A CN201410133398 A CN 201410133398A CN 103929142 B CN103929142 B CN 103929142B
- Authority
- CN
- China
- Prior art keywords
- inductance
- conductive
- input
- low pass
- pole
- 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.)
- Active
Links
Landscapes
- Filters And Equalizers (AREA)
Abstract
The present invention discloses that a kind of volume is little, low cost, have the lamination sheet type low pass filter for CATV of the LTCC structure of high q-factor and high conductivity.It includes the ceramic body that the multi layer substrate being made up of high-frequency ceramic diaphragm is constituted and the conductive coating being coated on every layer of substrate, is provided with three laminated inductances that at least four groups are coated with in half elliptic on it or semicircular three self-existent conductive coating laminations are constituted in this ceramic body.The present invention uses LTCC technique multiple structure to make the seven rank low pass filters with three transmission zeros, uses elliptic filter prototype by the coupling between lamination spiral inductance.Its a size of 3.2mm × 2.5mm × 1.0mm.LTCC technique is used to make, low cost, can mass production.It addition, the conductive coating on every two substrates uses parallel way in the laminated inductance of this low pass filter, increase coil section and amass, thus enhance the high-frequency figure factor of this wave filter.
Description
Technical field
The present invention relates to a kind of LTCC lamination sheet type wave filter, particularly relate to a kind of for CATV (CATV's
Full name is cable television, Chinese entitled cable television) lamination sheet type low pass filter.
Background technology
In prior art, it is used for distinguishing CATV (5MHz-1002MHz) and MoCA (English full name Multimedia
Over Coax Alliance, Chinese multimedia over Coax Alliance) signal D wave band (extended D Band
Low pass filter 1125MHz-1675MHz), the LC resonant circuit components of employing mostly is hollow coil electricity
Sense or Wound-rotor type inductance.It is by manual welding or SMT (English full name Surface Mounted
Technology, Chinese name: surface mounting technology) technique is connected in the PCB that designs.Logical
Often circuit is high to the required precision of LC element related parameter values, aborning need to be for every wave filter inside
LC loop debug, if desired, also need veteran skilled worker that air core coil is debugged,
To obtain the accurate parameters value needed.Its deficiency existed is:
The wave filter build produced is big, production efficiency is low, bad (the i.e. property of length at date of delivery, product repeatability
Can concordance poor), cost height and be unfavorable for large-scale mass production etc..
Summary of the invention
The technical problem to be solved in the present invention is to provide that a kind of volume is little, low cost, have high q-factor and height is led
The lamination sheet type low pass filter for CATV of the LTCC structure of electricity rate.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is:
The lamination sheet type low pass filter for CATV of the present invention, including being made many by high-frequency ceramic diaphragm
Ceramic body that layer substrate is constituted and the conductive coating that is coated on every layer of substrate, the earth terminal of this wave filter, defeated
Enter end and outfan be located on the substrate bottom this ceramic body, from the second layer substrate at this ceramic body top to,
It is provided with and is coated with in half elliptic by least four groups on it or semicircular three self-existent conductive coatings are folded
Three laminated inductances that sheet is constituted, the i.e. first inductance, the second inductance and the 3rd inductance, wherein, the most upper and lower two
Half elliptic on group lamination or the projection in vertical direction of semicircular conductive coating constitute one complete
Oval or circle, all half elliptics or semicircular conductive coating are serially connected in one by the conductive hole being arranged on
Rise, the top layer substrate of ceramic body is provided with by conductive hole by the first inductance and the second inductance connection together
The first conductive connecting piece, being provided with on laminated inductance one group of substrate bottom can be by the second inductance and the 3rd
Inductance connection the second conductive connecting piece together, the second conductive connecting piece by conductive hole with its under the
First Transition sheet on one input and output pole piece connects, and the first inductance passes through conductive hole and the first input and output pole
Input electrode sheet on sheet connects, the 3rd inductance by the 3rd conductive connecting piece that is arranged on top layer substrate and
First conduction long through-hole connects with the output electrode sheet on described first input and output pole piece；First input and output
Input electrode sheet on pole piece passes through conductive hole and the input electrode sheet phase on the second input and output pole piece under it
Connecing and connected with earthing pole by conductive pole, the first laminated body, capacitor, First Transition sheet passes through conductive hole and second
The second transition plate on input and output pole piece is connected and is connected with earth terminal by conductive pole, third layer stack electric capacity,
Output electrode sheet is connected with earth terminal by conductive hole, conductive pole, the 4th laminated body, capacitor, defeated in the second input
Going out and be additionally provided with the 3rd transition plate on pole piece, the 3rd transition plate is upwardly through between three laminated inductances
Two conduction long through-holes extend to the second substrate, and the 3rd transition plate passes downwardly through the conductive pole under it, the second lamination
Electric capacity connects with earthing pole.
Described laminated inductance is made up of five groups of conductive coating laminations.
Each group of conductive coating lamination is to be arranged on the identical two layers of conduction being connected in parallel of structure on two substrates to be coated with
Layer.
Described conductive pole is to be poured in the silver slurry post being arranged on multi-layer ceramics diaphragm in through hole.
The cross sectional dimensions of described first inductance be more than the second inductance and the cross sectional dimensions of the 3rd inductance, second
Inductance and the 3rd inductance cross sectional dimensions size are identical, and three inductance are spatially arranged in triangle disposition.
The physical dimension of described high-frequency ceramic body is: 3.2mm × 2.5mm × 1.0mm.
Compared with prior art, the present invention uses the making of LTCC technique multiple structure to have three transmission zeros
Seven rank low pass filters, use elliptic filter prototype by the coupling between lamination spiral inductance, improve electricity
Road characteristic, by by four groups of ground capacity branch roads and three groups LC resonant branch in parallel to be bonded seven rank low
Bandpass filter, thus, it is possible to obtain required three transmission zero, thus realizes transmission zero number
Control.In the case of meeting equivalent technology index, significantly reduce product size, its be only 3.2mm ×
2.5mm×1.0mm.Meanwhile, it the most effectively reduces the quantity of element, and the particularly number of inductance, in frequency band
Insertion loss less than 1.5dB, increase effectively Out-of-band rejection, reach the decay of more than 35dB in MoCA section.
Additionally, this low pass filter is owing to using LTCC technique to make, there is low cost, can mass production, high
The traditional PCB such as performance make the advantage that discrete LC wave filter does not has.It addition, the lamination electricity of this low pass filter
In sense, the conductive coating on every two substrates uses parallel way, increases coil section and amasss, thus enhances
The high-frequency figure factor of this wave filter.
Accompanying drawing explanation
Fig. 1 is low pass filter equivalent circuit diagram of the present invention.
Fig. 2 is the schematic perspective view of the present invention.
Fig. 3 is the exploded perspective view of Fig. 2.
Fig. 4 is the enlarged drawing of Fig. 3.
Fig. 5 is the frequency response chart of low pass filter of the present invention.
Reference:
Substrate the 1, first conductive connecting piece the 11, second conductive connecting piece the 12, the 3rd conductive connecting piece 13, lead
Conduct electricity long through-hole the 3, second conduction long through-hole the 4, first input and output pole piece 5, input electricity in electricity hole 2, first
Pole piece 51, output electrode sheet the 52, second input and output pole piece 6, First Transition sheet the 61, second transition plate
62, the 3rd transition plate 63, anode hold pole piece the 7, first pole piece the 71, second pole piece the 72, the 3rd pole piece 73,
4th pole piece 74, negative terminal hold pole piece 8, input pole piece 81, output pole plate 82, ground connection pole piece 83, ground connection
End 9, input 91, outfan 92, conductive pole the 93, first inductance L1, the head end L11 of the first inductance,
The end L12 of the first inductance, the second inductance L2, the head end L21 of the second inductance, the end L22 of the second inductance,
3rd inductance L3, the head end L31 of the 3rd inductance, the end L32 of the 3rd inductance, the first electric capacity C1, second
Electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5, the 6th electric capacity C6, the 7th electric capacity
C7。
Detailed description of the invention
As it is shown in figure 1, the lamination sheet type low pass filter for CATV of the present invention is for being embedded in high-frequency ceramic
LTCC stepped construction in body, its equivalent circuit is seven rank low pass filters, its LC that is horizontal by three groups and that connect
Resonant branch and four groups of longitudinal direction ground capacity branch roads are constituted.
Laterally LC resonant branch is respectively the first inductance L1 from left to right (with Fig. 1 paper as reference direction)
With the first electric capacity C1, the second inductance L2 and the second electric capacity C2, the 3rd inductance L3 and the 3rd electric capacity C3；Longitudinally
LC resonant branch (reference direction is ibid) from left to right the 4th electric capacity C4 respectively, the 5th electric capacity C5, the 6th electricity
Hold C6 and the 7th electric capacity C7.
It is input 91 that first inductance L1 and the 4th electric capacity C4 connects end, the 3rd inductance L3 and the 7th electric capacity
It is outfan 92 that C7 connects end, the 4th electric capacity C4, the 5th electric capacity C5, the 6th electric capacity C6 and the 7th electric capacity C7
Ground connection.
As shown in Figure 2,3, 4, the pottery that the multi layer substrate 1 that the present invention is made up of high-frequency ceramic diaphragm is constituted
Body, applies on every layer of substrate 1 and is starched, by silver, the conductive coating made, and it is by the lamination being positioned at ceramic body top
Inductance formed district, the input and output electrode district at middle part, the conductive pole 93 of middle and lower part, laminated body, capacitor formed district and
The earth terminal 9 of bottom, input 91 and outfan 92 district are constituted.
One, laminated inductance formed the conductive hole 2 that by three laminated inductances and is respectively arranged on each substrate 1 of district and
The conduction long through-hole serving as electrode tip is constituted, and its layout is as follows:
1, the first inductance L1, the second inductance L2 and that three laminated inductances are respectively in described equivalent circuit
Three inductance L3, from the second layer substrate 1 at this ceramic body top to, (the present invention at least four group laminations
It is preferably five groups) it is coated with in half elliptic or semicircular conductive coating, the preferred half elliptic of the present invention,
Often three self-existent conductive coatings of coating (i.e. each other without being directly connected to) on group lamination, the most upper and lower two groups
The projection in vertical direction of conductive coating on lamination constitutes a complete ellipse or circle, on each group lamination
Three conductive coatings be serially connected by the conductive hole about 2 that is arranged on, thus constitute three laminations
Inductance, i.e. described the first inductance L1, the second inductance L2 and the 3rd inductance L3.
2, the cross sectional dimensions of the first inductance L1 is more than the second inductance L2 and the cross section chi of the 3rd inductance L3
Very little, the second inductance L2 and the 3rd inductance L3 size are identical, and three inductance spatially set in triangle disposition
Putting, the transverse of the second inductance L2 and the 3rd inductance L3 is perpendicular to the transverse of the first inductance L1.
3, being provided with the first conductive connecting piece 11 and the 3rd conductive connecting piece 13 on top layer substrate 1, first leads
One end of electric connecting sheet 11 is connected with the end L12 of the first inductance the (head end of the first inductance by conductive hole 2
L11 is positioned on the 5th group of lamination of local area and by conductive hole 2 and the input electricity in the input and output electrode district under it
Pole piece 51 connects), its other end is connected with the head end L21 of the second inductance by conductive hole 2；3rd conduction
The one end connecting sheet 13 is connected by the end L32 of conductive hole 2 with the 3rd inductance, and its other end passes through first
Conduction long through-hole 3 extends downward described input and output electrode district；Second conductive connecting piece 12 is arranged at this
On the 5th group of district substrate 1, its one end is connected with the end L22 of the second inductance, its other end and the 3rd inductance
Head end L31 be connected.
4, the present invention the most often organizes lamination is two layers of substrate 1, the conductive coating structure on these two layers of substrates 1 and
Shape is identical, and is connected in parallel together therebetween, and this structure can increase laminated inductance coil section and amass, from
And enhance the high-frequency figure factor of this wave filter.
Two, input and output electrode district is made up of two floor substrate 1, and upper substrate is (also known as the first input and output pole
Sheet 5) it is provided with input electrode sheet 51, First Transition sheet 61 and output electrode sheet 52, underlying basal (also known as
Second input and output pole piece 6) it is provided with input electrode sheet the 51, second transition plate 62 and the 3rd transition plate 63；
The end L22 of the second inductance is by conductive hole 2 and the First Transition sheet 61 on local area upper substrate 1, lower floor
The second transition plate 62 on substrate connects；The lower end of described first conduction long through-hole 3 and local area upper substrate 1
Output electrode sheet 52 connect；About one the second conduction placed it is additionally provided with long between three laminated inductances
Through hole 4, the upper end of the second conduction long through-hole 4 is positioned at the central part of top the second substrate 1, and its lower end connects
The 3rd transition plate 63 on local area underlying basal.
Three, laminated body, capacitor formation district is made up of four laminated body, capacitors, and four laminated body, capacitors are respectively equivalent circuit
In the 4th electric capacity C4 (also known as the first laminated body, capacitor), the 5th electric capacity C5 (also known as the second laminated body, capacitor),
Six electric capacity C6 (also known as third layer stack electric capacity) and the 7th electric capacity C7 (also known as the 4th laminated body, capacitor), its distribution
Underlying basal 1 and the anode of local area in input and output electrode district hold between pole piece 7 and negative terminal appearance pole piece 8,
Concrete attachment structure is as follows:
1, the input electrode sheet 51 on described underlying basal 1 holds pole piece by conductive pole 93 with the anode under it
The first pole piece 71 on 7 is connected；The second transition plate 62 on described underlying basal 1 by conductive pole 93 with
The 3rd pole piece 73 that described anode holds on pole piece 7 is connected；The 3rd transition plate 63 on described underlying basal 1
The second pole piece 72 held on pole piece 7 with described anode by conductive pole 93 is connected；On described upper substrate 1
Output electrode sheet 52 hold the 4th pole piece on pole piece 7 by conductive hole 2 and conductive pole 93 with described anode
74 are connected.
2, equivalent circuit is formed between input electrode sheet 51 and the 3rd transition plate 63 on described underlying basal
In the first electric capacity C1；The in equivalent circuit is formed between the 3rd transition plate 63 and the second transition plate 62
Two electric capacity C2；Equivalence is formed between output electrode sheet 52 on the second transition plate 62 and described upper substrate
The 3rd electric capacity C3 in circuit.
3, described negative terminal appearance pole piece 8 is positioned under anode appearance pole piece 7, is provided with thereon and looks up can cover from vertical
Lid anode holds the ground connection pole piece 83 of four pole pieces 71,72,73,74 on pole piece 7, other at ground connection pole piece 83
Side is provided with input pole piece 81 and output pole plate 82, and input pole piece 81 and output pole plate 82 are oppositely arranged, just
End hold four pole pieces 71,72,73,74 on pole piece 7 and negative terminal hold the ground connection pole piece 83 on pole piece 8 it
Between form the 4th electric capacity C4 in equivalent circuit, the 5th electric capacity C5, the 6th electric capacity C6 and the 7th electric capacity C7.
Four, earth terminal 9, input 91 and outfan 92 district are positioned at the bottom of ceramic body, and it is by two layers of substrate
1 is constituted, and every layer of substrate 1 is provided with input 91, earth terminal 9 and outfan 92, input 91 and output
End 92 is oppositely arranged, earth terminal 9 between input 91 and outfan 92, defeated on two layers of substrate 1
Enter end 91, earth terminal 9 and outfan 92 to be connected by conductive hole about 2 respectively, and hold pole with described negative terminal
Input pole piece 81, ground connection pole piece 83 and output pole plate 82 one_to_one corresponding on sheet 8 connect.
As it is shown in figure 5, the community that the low-pass filter circuit of the present invention is less than-1.5dB by insertion loss connects
Entering TV signal CATV, it can suppress the decay MoCA signal more than-35dB.
It is applicable to community access TV signal CATV and includes Up stream (5-42MHz)/Down
Stream (54-1002MHz), i.e. has the frequency less than or equal to 1002MHz.
Described MoCA signal has the frequency more than or equal to 1125MHz, i.e. at 1125MHz to 1675MHz
Between.
The low pass filter of the present invention, can be serially connected between two ceramic filter elements, the two wave filter
In one play duplexer effect, be used for distributing CATV signal and MOCA signal, make MoCA frequency range simultaneously,
I.e. the signal attenuation more than 1125MHz is equal to or less than-70dB.Another is used for distinguishing a kind of low-pass filtering
Up steam after device output and down stream signal.
The low pass filter of the present invention, including three external terminal electrodes (i.e. earth terminal 9, input of bottom surface printing
End 91 and outfan 92), the electric property of whole wave filter is symmetrical relative to input and output electrode, for nonpolarity
Wave filter.
This low pass filter is designed to sufficiently small size: 3.2mm × 2.5mm × 1.0mm, and traditional PCB
Solve discrete filters scheme size to realize on the PCB of about 15*25mm size, need in use to join simultaneously
The shielding case of large-size, causes volume relatively big, relatively costly.LTCC wave filter involved in the present invention is only
Take the long-pending beneficially miniaturization of the least PCB surface and reduce cost.
Useful the having the technical effect that of the present invention
1. use LTCC height Q high-frequency ceramic material and high conductivity silver slurry, have less dielectric loss and conductor
Loss, is greatly reduced product size.
2. using LTCC technique to make, homogeneity of product is high, owing to being the parallel process using printing, simultaneously
Large-tonnage product can be produced, be greatly improved than home built production efficiency.
3. use LTCC technique to make, decrease original PCB scheme and artificial debugging is relied on, shorten product
Product Production Time, reduce production cost.
4. inductance coil circuit pack uses parallel way, increases coil section and amasss, increases high-frequency figure
Factor.
The present invention constitutes in low pass filter ceramic body and has high q-factor Meander line inductor.
Table one is to design and produce the test result of low pass filter embodiment and the right of desired value according to the present invention
Ratio: table one implements row and target value
Claims (6)
1. for a lamination sheet type low pass filter of CATV, including being made many by high-frequency ceramic diaphragm
The ceramic body that layer substrate (1) is constituted and the conductive coating being coated on every layer of substrate (1), this wave filter
Earth terminal (9), input (91) and outfan (92) are located on the substrate (1) bottom this ceramic body,
It is characterized in that: from the second layer substrate (1) at this ceramic body top to, be provided with and be coated with on it by least four groups
It is covered with in half elliptic or three lamination electricity of semicircular three self-existent conductive coating laminations composition
Sense, the i.e. first inductance (L1), the second inductance (L2) and the 3rd inductance (L3), wherein, the most upper and lower two groups
The projection in vertical direction of half elliptic on lamination or semicircular conductive coating constitute one complete ellipse
Circle or circle, all half elliptics or semicircular conductive coating are serially connected in by the conductive hole (2) being arranged on
Together, the top layer substrate (1) of ceramic body is provided with by conductive hole (2) by the first inductance (L1) with
The first conductive connecting piece (11) that second inductance (L2) links together, at laminated inductance bottom one group
Substrate (1) is provided with the second conduction that can the second inductance (L2) and the 3rd inductance (L3) be linked together
Connect sheet (12), the second conductive connecting piece (12) by conductive hole (2) with its under first input defeated
The First Transition sheet (61) gone out on pole piece (5) connects, the first inductance (L1) by conductive hole (2) with
Input electrode sheet (51) on first input and output pole piece (5) connects, and the 3rd inductance (L3) is by arranging
The 3rd conductive connecting piece (13) on top layer substrate (1) and the first conduction long through-hole (3) and described the
Output electrode sheet (52) on one input and output pole piece (5) connects；On first input and output pole piece (5)
Input electrode sheet (51) by defeated with on the second input and output pole piece (6) under it of conductive hole (2)
Enter electrode slice (51) to connect and connected with earthing pole by conductive pole (93), the first laminated body, capacitor, the first mistake
Cross sheet (61) by conductive hole (2) and the second transition plate (62) on the second input and output pole piece (6)
Connect and pass through conductive pole (93), third layer stack electric capacity connects with earth terminal (9), output electrode sheet (52)
Connected with earth terminal (9) by conductive hole (2), conductive pole (93), the 4th laminated body, capacitor, defeated second
Enter and on output pole plate (6), be additionally provided with the 3rd transition plate (63), the 3rd transition plate (63) upwardly through between
The second conduction long through-hole (4) between three laminated inductances extends to the second substrate (1), the 3rd transition plate (63)
Pass downwardly through the conductive pole under it (93), the second laminated body, capacitor connects with earthing pole.
Lamination sheet type low pass filter for CATV the most according to claim 1, it is characterised in that:
Described laminated inductance is made up of five groups of conductive coating laminations.
Lamination sheet type low pass filter for CATV the most according to claim 1 and 2, its feature
It is: each group of conductive coating lamination is to be arranged on upper identical two layers be connected in parallel of structure of two substrates (1)
Conductive coating.
Lamination sheet type low pass filter for CATV the most according to claim 3, it is characterised in that:
Described conductive pole (93) is for being poured in the silver slurry post being arranged on multi-layer ceramics diaphragm in through hole.
Lamination sheet type low pass filter for CATV the most according to claim 1, it is characterised in that:
The cross sectional dimensions of described first inductance (L1) is more than the second inductance (L2) and the horizontal stroke of the 3rd inductance (L3)
Sectional dimension, the second inductance (L2) is identical with the cross sectional dimensions size of the 3rd inductance (L3), three electricity
Sense is spatially arranged in triangle disposition.
Lamination sheet type low pass filter for CATV the most according to claim 1, it is characterised in that:
The physical dimension of described high-frequency ceramic body is: 3.2mm × 2.5mm × 1.0mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410133398.6A CN103929142B (en) | 2014-04-03 | 2014-04-03 | Lamination sheet type low pass filter for CATV |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410133398.6A CN103929142B (en) | 2014-04-03 | 2014-04-03 | Lamination sheet type low pass filter for CATV |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103929142A CN103929142A (en) | 2014-07-16 |
| CN103929142B true CN103929142B (en) | 2016-08-24 |
Family
ID=51147244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410133398.6A Active CN103929142B (en) | 2014-04-03 | 2014-04-03 | Lamination sheet type low pass filter for CATV |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103929142B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106328354A (en) * | 2015-06-17 | 2017-01-11 | 深圳市高斯博电子科技有限公司 | An LTCC technology-based multi-winding wire arrangement induction transformer coil |
| JP6380315B2 (en) * | 2015-09-26 | 2018-08-29 | 株式会社村田製作所 | Multilayer LC filter |
| CN111324995A (en) * | 2018-12-14 | 2020-06-23 | 西安博瑞集信电子科技有限公司 | LTCC-based 1GHz low-pass filter and design method |
| CN111478677A (en) * | 2019-01-23 | 2020-07-31 | 西安博瑞集信电子科技有限公司 | 670MHz low-pass filter based on L TCC and design method |
| CN111262545B (en) * | 2020-03-26 | 2023-06-16 | 西安广和通无线通信有限公司 | Low pass filter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1366313A (en) * | 2001-01-19 | 2002-08-28 | 株式会社村田制作所 | Layered impedance device |
| CN102044322A (en) * | 2009-10-12 | 2011-05-04 | 佳邦科技股份有限公司 | Common-mode filter and manufacturing method thereof |
| CN102457243A (en) * | 2010-10-21 | 2012-05-16 | 株式会社村田制作所 | Multilayer filter |
| CN103078158A (en) * | 2013-01-28 | 2013-05-01 | 南京理工大学 | L-band miniature low-pass filter |
-
2014
- 2014-04-03 CN CN201410133398.6A patent/CN103929142B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1366313A (en) * | 2001-01-19 | 2002-08-28 | 株式会社村田制作所 | Layered impedance device |
| CN102044322A (en) * | 2009-10-12 | 2011-05-04 | 佳邦科技股份有限公司 | Common-mode filter and manufacturing method thereof |
| CN102457243A (en) * | 2010-10-21 | 2012-05-16 | 株式会社村田制作所 | Multilayer filter |
| CN103078158A (en) * | 2013-01-28 | 2013-05-01 | 南京理工大学 | L-band miniature low-pass filter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103929142A (en) | 2014-07-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103929142B (en) | Lamination sheet type low pass filter for CATV | |
| CN104538714B (en) | Band-pass filter with center frequency adjustable | |
| CN103684327B (en) | High frequency filter | |
| CN208241640U (en) | A kind of LTCC high-pass filter | |
| CN103066347B (en) | Novel low temperature co-fired ceramic (LTCC) laminated slice-type duplexer | |
| CN104241737B (en) | A kind of LTCC based on resonator coupling filters balun | |
| CN106099280B (en) | A kind of LC bandpass filter based on the distribution of through silicon via coupled capacitor | |
| CN103986434A (en) | Lumped parameter minitype LTCC high-pass filter | |
| CN103986438A (en) | Laminated plate type filter | |
| CN110932699A (en) | Miniaturized high-suppression LTCC column-type inductance band-pass filter | |
| CN103457563B (en) | Electronic devices and components | |
| CN103997309A (en) | Polar-type low pass filter and demultiplexer equipped therewith | |
| CN105141273B (en) | A kind of electromagnetic interface filter for folding chain type feedthrough capacitor structure | |
| CN212277356U (en) | Microwave dielectric waveguide filter with eight-order and four-zero | |
| CN105846789B (en) | Low-pass filter and preparation method thereof | |
| JP2016540467A (en) | Multilayer chip type ceramic radio frequency low pass filter and method of manufacturing the same | |
| CN209184569U (en) | A kind of novel medium ceramics low-pass filter | |
| CN108808185A (en) | A kind of LTCC bandpass filters suitable for L-band | |
| CN106450630A (en) | Miniaturized high-restrain multilayer balun | |
| CN103081357B (en) | Electronic devices and components | |
| CN205647456U (en) | IPD low pass filter | |
| CN209627337U (en) | A kind of 5G high-performance LTCC bandpass filter inhibiting higher hamonic wave | |
| CN107332531A (en) | A kind of preparation method of lamination tunable filter and adjustable core inductance | |
| CN210609090U (en) | Miniaturized high-suppression LTCC column-type inductance band-pass filter | |
| CN103872410B (en) | Band filter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |