CN109950670A - Both-end open circuit coupling line based on LTCC loads stub ultra-wide band filter - Google Patents
Both-end open circuit coupling line based on LTCC loads stub ultra-wide band filter Download PDFInfo
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- CN109950670A CN109950670A CN201910135325.3A CN201910135325A CN109950670A CN 109950670 A CN109950670 A CN 109950670A CN 201910135325 A CN201910135325 A CN 201910135325A CN 109950670 A CN109950670 A CN 109950670A
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Abstract
The present invention relates to a kind of, and the both-end open circuit coupling line based on LTCC loads stub ultra-wide band filter, belong to microwave technical field, the filter based on LTCC can compact arrangement advantage, using three-level broadside close coupling line, the mode of input and output end load stub successfully realizes ultra-wide band filter；Ultra-wide band filter is realized three-dimensionally integrated using low-temperature co-fired ceramics (LTCC) technology, with ultra wide band, the advantages such as extremely low loss, compact-sized, small in size, electrical property is good, high integration, high finished product rate and the coefficient of expansion are low, has in fields such as military satellite communication system, radar system and the medical treatment more demanding to temperature stability and good use prospect.
Description
Technical field
The invention belongs to microwave technical fields, and in particular to a kind of both-end open circuit coupling line load stub based on LTCC
Ultra-wide band filter.
Background technique
Primary Component one of of the filter as passive device in all kinds of communication systems has protection useful signal, filters out
Garbage signal provides the function of system worked well.With the continuous extension of the communication technology, Modern Filter towards size more
It is small, performance is higher, cost is lower, easily facilitate volume production direction update.Super-broadband tech is initially applied in military field,
The most common ultra wide band definition then derives from ultra wideband radar system.How to make LTCC ultra-wide band filter that there is wider resistance
Band, more low-loss, smaller volume are the research emphasis of current scientific research personnel.Defect ground structure is by carving spy on earth plate
Fixed figure can allow the transmission line of defect ground to have one to change the distribution capacity distributed inductance of transmission line on ground plane
Fixed band resistance or slow wave characteristic, are able to suppress the transmission of special frequency channel signal.
Low-temperature co-fired ceramics (LTCC, Low Temperature Co-fired Ceramic) technology is a kind of emerging
Passive device integration technology, passive device can be miniaturized by multilayer technology.LTCC technology is with certain dielectric constant
Ceramics be medium, be made into ceramic substrate and carry out being stacked required circuit or module.It is mainly used in high density collection
At technology, high power module, three general orientation of microwave/millimeter wave component, main devices have LTCC element, LTCC functional device,
LTCC package substrate, LTCC integration module etc..Gained final products either passive device or active passive device integration
Machine system all has small in size, and performance is stablized, and batch production has many advantages, such as cost advantage, has a extensive future, with very
Big researching value.
Summary of the invention
The both-end open circuit coupling line load stub ultra wide band filtering based on LTCC that the purpose of the present invention is to provide a kind of
Device realizes there is ultra wide band, extremely low loss, compact-sized, volume by low-temperature co-fired ceramics (LTCC) three-dimensional integration technology
The advantages such as small, electrical property is good, high integration, high finished product rate and the coefficient of expansion are low.
Realize the technical solution of the object of the invention are as follows: a kind of both-end open circuit coupling line load stub ultra-wide based on LTCC
Band filter, including input port, output port, first segment fold coupling line, second segment folds coupling line, folded in three coupling
Zygonema, the 4th section of folding coupling line, the 5th section of folding coupling line, the 6th section of folding coupling line, first segment ground connection fold coupling line,
Second segment ground connection folds coupling line, rear side ground terminal, front side ground terminal, Bottom ground layer, left side defect ground structure, central defect
Ground structure and right defect ground structure；Input port and output port characteristic impedance are 50 ohm；
First segment folding coupling line is identical as the 6th section of folding coupled line structure, and second segment folds coupling line and the 5th section of folding
Folded coupled line structure is identical, and folded in three coupling line is identical as the 4th section of folding coupled line structure, and first segment ground connection folds coupling
Zygonema is identical as second segment ground connection folding coupled line structure, and left side defect ground structure is identical as right defect ground structure structure；Six
Section folds coupling line and two sections of ground connection fold coupling line and count from top to bottom, and first segment folds coupling line and first segment ground connection folds
Coupling line is located at first layer, and second segment folds coupling line and folded in three coupling line is located at the second layer, the 4th section of folding coupling
Line and the 5th section of folding coupling line are located at third layer, and the 6th section of folding coupling line and second segment ground connection fold coupling line and is located at the 4th
Layer；The input port and first segment that impedance is 50 ohm fold one end of coupling line and first segment ground connection folds the one of coupling line
End is connected, and first segment folds the other end open circuit of coupling line, and first segment ground connection folds the other end and front side ground terminal of coupling line
It is connected, second segment folds one end open circuit of coupling line, and the other end is connected with folded in three coupling line one end, folded in three coupling
Zygonema other end open circuit, the 4th section of folding coupling line one end open circuit, the other end are connected with the 5th section of folding coupling line one end, and the 5th
Section folds coupling line other end open circuit, the 6th section of folding coupling line one end open circuit, the output end that the other end is 50 ohm with impedance
Mouth and second segment ground connection fold coupling line one end and are connected, the second segment ground connection folding coupling line other end and front side ground terminal phase
Even, rear side ground terminal links together with front side ground terminal and Bottom ground layer, left side defect ground structure and central defect
Structure and right defect ground structure are located on Bottom ground layer.
Compared with prior art, remarkable advantage of the invention are as follows: the present invention uses low-temperature co-fired ceramics (LTCC) technique skill
Art realization is three-dimensionally integrated, and with ultra wide band, extremely low loss, compact-sized, small in size, electrical property is good, high integration, Gao Chengpin
The advantages such as rate and the coefficient of expansion are low can be widely used in the military radar system more demanding to job stability, satellite
The fields such as communication system and medical treatment.
Detailed description of the invention
Fig. 1 is that a kind of structure of the both-end open circuit coupling line load stub ultra-wide band filter based on LTCC of the present invention is shown
It is intended to.
Fig. 2 is a kind of vertical view of the both-end open circuit coupling line load stub ultra-wide band filter based on LTCC of the present invention
Figure.
Fig. 3 is a kind of both-end open circuit coupling line load stub ultra-wide band filter main performance based on LTCC of the present invention
Curve graph.
Specific embodiment
In conjunction with Fig. 1, Fig. 2, a kind of both-end open circuit coupling line load stub ultra-wide band filter based on LTCC, including spy
Sign impedance is 50 ohm of input port INPUT and output port OUTPUT, first segment folds coupling line L1, second segment folds
Coupling line L2, folded in three coupling line L3, the 4th section of folding coupling line L4, the 5th section of folding coupling line L5, the 6th section of folding
Coupling line L6, first segment ground connection folding coupling line L7, second segment ground connection folding coupling line L8, rear side ground terminal GND1, front side connect
Ground terminal GND2, Bottom ground layer GND3, left side defect ground structure DGS1, central defect ground structure DGS2, right defect ground structure
DGS3。
It is identical with the 6th section of folding coupling line L6 structure that first segment folds coupling line L1, second segment folding coupling line L2 and the
Five sections of folding coupling line L5 structures are identical, and folded in three coupling line L3 is identical as the 4th section of folding coupling line L4 structure, and first
Section ground connection folding coupling line L7 is identical as second segment ground connection folding coupling line L8 structure, and left side defect ground structure DGS1 and right side lack
It is identical to fall into ground structure DGS3 structure.Six sections of folding coupling lines and two sections of ground connection fold coupling line and count from top to bottom, first segment folding
Folded coupling line L1 and first segment ground connection fold coupling line L7 and are located at first layer, and second segment folds coupling line L2 and folded in three coupling
Zygonema L3 is located at the second layer, and coupling line L4 and the 5th section of folding coupling line L5 of the 4th section of folding is located at third layer, the 6th section of folding
Coupling line L6 and second segment ground connection fold coupling line L8 and are located at the 4th layer.The input port INPUT and first that impedance is 50 ohm
One end that section folds one end of coupling line L1 and first segment ground connection folds coupling line L7 is connected, and first segment folds coupling line L1's
Other end open circuit, the other end that first segment ground connection folds coupling line L7 are connected with front side ground terminal GND2, and second segment folds coupling
One end of line L2 is opened a way, and the other end is connected with the one end folded in three coupling line L3, and the folded in three coupling line L3 other end is opened
Road, the 4th section of folding one end coupling line L4 open circuit, the other end are connected with the 5th section of folding one end coupling line L5, the 5th section of folding coupling
The output port that zygonema L5 other end open circuit, the 6th section of folding one end coupling line L6 open circuit, the other end and impedance are 50 ohm
OUTPUT and second segment ground connection fold the one end coupling line L8 and are connected, and second segment ground connection folds the coupling line L8 other end and connects with front side
Ground terminal GND2 is connected, and rear side ground terminal GND1 links together with front side ground terminal GND2 and Bottom ground layer GND3, left side
Defect ground structure DGS1 and central defect ground structure DGS2 and right defect ground structure DGS3 is located on Bottom ground layer GND3.
The input port INPUT, output port OUTPUT, first segment fold coupling line L1, second segment folds coupling line
L2, folded in three coupling line L3, the 4th section of folding coupling line L4, the 5th section of folding coupling line L5, the 6th section of folding coupling line
L6, first segment ground connection fold coupling line L7, second segment ground connection folds coupling line L8, rear side ground terminal GND1, front side ground terminal
GND2, Bottom ground layer GND3, left side defect ground structure DGS1, central defect ground structure DGS2, right defect ground structure DGS3
Realized by low-temperature co-fired ceramics LTCC technology.
First segment folds coupling line L1, second segment folds coupling line L2, folded in three coupling line L3, the 4th section of folding coupling
Zygonema L4, the 5th section of folding coupling line L5, the 6th section of folding coupling line L6, first segment ground connection folds coupling line L7, second segment connects
Ground folds coupling line L8 and is all made of collapsed shape to reduce area, realizes the miniaturization of filter.
First segment folds coupling line L1, second segment folds coupling line L2, folded in three coupling line L3, the 4th section of folding coupling
Zygonema L4, the 5th section of folding coupling line L5, the 6th section of folding coupling line L6 are both-end open circuit coupling line, strong by using broadside
Coupled structure and the band-pass filtering property for realizing ultra wide band, while improving precipitous with interior performance and sideband.First segment ground connection folds
It is quarter-wave short circuited stub that coupling line L7, second segment ground connection, which fold coupling line L8, and it is humorous to be equivalent to RLC parallel connection broadband
Shake unit.First segment ground connection, which is loaded, by both-end open circuit coupling line folds coupling line L7 and second segment ground connection folding coupling line L8
Realize better stopband inhibition and squareness factor.Left side defect ground structure DGS1, central defect ground structure DGS2, right defect
Structure DGS3 is realized by and Bottom ground layer GND3 is etched.Left side defect ground structure DGS1, it ties to central defect
Structure DGS2, right defect ground structure DGS3 are dumbbell shape defect ground structure, high-end by reinforcing in high-end generation trap wave point
Stopband attenuation.
The present invention realizes that stereoscopic three-dimensional is integrated by low-temperature co-fired ceramics LTCC technology, therefore high with stability,
The advantages that packaging density is strong, production yield rate is high, production cost is low, anti-adverse environment ability is strong.
In the present embodiment based on LTCC both-end open circuit coupling line load stub ultra-wide band filter size be only
3.5mm × 1.9mm × 1.2mm, working frequency are 4GHz~10.6GHz, from figure 3, it can be seen that this ultra-wide band filter returns
Wave loss is better than 13dB.
Claims (5)
1. a kind of both-end open circuit coupling line based on LTCC loads stub ultra-wide band filter, it is characterised in that: including input
Port (INPUT), output port (OUTPUT), first segment folds coupling line (L1), second segment folds coupling line (L2), third section
Fold coupling line (L3), the 4th section of folding coupling line (L4), the 5th section of folding coupling line (L5), the 6th section of folding coupling line
(L6), first segment ground connection folds coupling line (L7), second segment ground connection folds coupling line (L8), rear side ground terminal (GND1), front side
Ground terminal (GND2), Bottom ground layer (GND3), left side defect ground structure (DGS1), central defect ground structure (DGS2) and right side
Defect ground structure (DGS3)；Input port (INPUT) and output port (OUTPUT) characteristic impedance are 50 ohm；
First segment fold coupling line (L1) it is identical with the 6th section of foldings coupling line (L6) structure, second segment folding coupling line (L2) and
5th section of folding coupling line (L5) structure is identical, folded in three coupling line (L3) and the 4th section of folding coupling line (L4) structure phase
Together, first segment ground connection folding coupling line (L7) is identical as second segment ground connection folding coupling line (L8) structure, left side defect ground structure
(DGS1) identical as right defect ground structure (DGS3) structure；Six sections of folding coupling lines and two sections of ground connection fold coupling lines from upper
It counts down, first segment folds coupling line (L1) and first segment ground connection folds coupling line (L7) and is located at first layer, and second segment folds coupling
Zygonema (L2) and folded in three coupling line (L3) are located at the second layer, the 4th section of folding coupling line (L4) and the 5th section of folding coupling
Line (L5) is located at third layer, and the 6th section of folding coupling line (L6) and second segment ground connection fold coupling line (L8) and is located at the 4th layer；Resistance
Resist and folds and couple with one end of first segment folding coupling line (L1) and first segment ground connection for 50 ohm of input port (INPUT)
One end of line (L7) is connected, and first segment folds the other end open circuit of coupling line (L1), and first segment ground connection folds coupling line (L7)
The other end is connected with front side ground terminal (GND2), and second segment folds one end open circuit of coupling line (L2), and the other end and third section are rolled over
Folded coupling line one end (L3) is connected, folded in three coupling line (L3) other end open circuit, the 4th section of folding coupling line (L4) one end
Open circuit, the other end are connected with the 5th section of folding coupling line (L5) one end, the 5th section of folding coupling line (L5) other end open circuit, and the 6th
Section folds coupling line one end (L6) open circuit, the other end and impedance and is grounded for 50 ohm of output port (OUTPUT) and second segment
Coupling line one end (L8) is folded to be connected, second segment ground connection folds coupling line (L8) other end and is connected with front side ground terminal (GND2),
Rear side ground terminal (GND1) links together with front side ground terminal (GND2) and Bottom ground layer (GND3), ties to left side defect
Structure (DGS1) and central defect ground structure (DGS2) and right defect ground structure (DGS3) are located on Bottom ground layer (GND3).
2. the both-end open circuit coupling line according to claim 1 based on LTCC loads stub ultra-wide band filter, special
Sign is: input port (INPUT), output port (OUTPUT), first segment fold coupling line (L1), second segment folds coupling line
(L2), folded in three coupling line (L3), the 4th section of folding coupling line (L4), the 5th section of folding coupling line (L5), the 6th section of folding
Folded coupling line (L6), first segment ground connection fold coupling line (L7), second segment ground connection folds coupling line (L8), rear side ground terminal
(GND1), front side ground terminal (GND2), Bottom ground layer (GND3), left side defect ground structure (DGS1), central defect ground structure
(DGS2), right defect ground structure (DGS3) is realized by low-temperature co-fired ceramics (LTCC) technology.
3. the both-end open circuit coupling line according to claim 1 or 2 based on LTCC loads stub ultra-wide band filter,
Be characterized in that: first segment folds coupling line (L1), second segment folds coupling line (L2), folded in three coupling line (L3), the 4th
Section folding coupling line (L4), the 5th section of folding coupling line (L5), the 6th section of folding coupling line (L6) are both-end open circuit coupling line.
4. the both-end open circuit coupling line according to claim 1 or 2 based on LTCC loads stub ultra-wide band filter,
Be characterized in that: first segment ground connection folds coupling line (L7), second segment ground connection folding coupling line (L8) is quarter-wave length
Short out transversal is equivalent to RLC parallel connection wideband resonance unit.
5. the both-end open circuit coupling line according to claim 1 or 2 based on LTCC loads stub ultra-wide band filter,
Be characterized in that: left side defect ground structure (DGS1), central defect ground structure (DGS2), right defect ground structure (DGS3) pass through
It is etched and realizes in Bottom ground layer (GND3)；Left side defect ground structure (DGS1), central defect ground structure (DGS2), the right side
Side defect ground structure (DGS3) is dumbbell shape defect ground structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910135325.3A CN109950670B (en) | 2019-02-22 | 2019-02-22 | LTCC-based double-end open-circuit coupling line loading stub ultra-wideband filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910135325.3A CN109950670B (en) | 2019-02-22 | 2019-02-22 | LTCC-based double-end open-circuit coupling line loading stub ultra-wideband filter |
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| Publication Number | Publication Date |
|---|---|
| CN109950670A true CN109950670A (en) | 2019-06-28 |
| CN109950670B CN109950670B (en) | 2020-11-17 |
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| CN201910135325.3A Expired - Fee Related CN109950670B (en) | 2019-02-22 | 2019-02-22 | LTCC-based double-end open-circuit coupling line loading stub ultra-wideband filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114335940A (en) * | 2021-11-06 | 2022-04-12 | 南京理工大学 | Novel ultra-wideband band-pass filter based on LTCC technology |
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2019
- 2019-02-22 CN CN201910135325.3A patent/CN109950670B/en not_active Expired - Fee Related
Patent Citations (5)
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| TWM321590U (en) * | 2007-05-15 | 2007-11-01 | Advanced Ceramic X Corp | Miniaturized balanced filter |
| KR20110065007A (en) * | 2009-12-09 | 2011-06-15 | 조인셋 주식회사 | Emi lc filter having a fuction for protecting electro-static discharge |
| CN104332681A (en) * | 2014-09-12 | 2015-02-04 | 南京理工大学 | Novel three-dimensional multilayer single-zero-point dual-mode filter |
| CN104638323A (en) * | 2015-02-06 | 2015-05-20 | 南京理工大学 | High-selectivity broadband multi-order band-pass filter based on LTCC (Low Temperature Co-Fired Ceramic) technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114335940A (en) * | 2021-11-06 | 2022-04-12 | 南京理工大学 | Novel ultra-wideband band-pass filter based on LTCC technology |
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