CN109803485A - Low pass circuit, printed circuit board and dielectric waveguide filter that distal end inhibits can be improved - Google Patents
Low pass circuit, printed circuit board and dielectric waveguide filter that distal end inhibits can be improved Download PDFInfo
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- CN109803485A CN109803485A CN201910025200.5A CN201910025200A CN109803485A CN 109803485 A CN109803485 A CN 109803485A CN 201910025200 A CN201910025200 A CN 201910025200A CN 109803485 A CN109803485 A CN 109803485A
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- circuit board
- printed circuit
- low pass
- pass circuit
- strip line
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- 239000003990 capacitor Substances 0.000 claims abstract description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 22
- 229910052802 copper Inorganic materials 0.000 claims description 22
- 239000010949 copper Substances 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 5
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 238000005457 optimization Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 14
- 238000004891 communication Methods 0.000 description 9
- 238000013461 design Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000005452 bending Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 238000005538 encapsulation Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000007639 printing Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000002044 microwave spectrum Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000009897 systematic effect Effects 0.000 description 2
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 1
- 229930006000 Sucrose Natural products 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000005720 sucrose Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
This application discloses one kind can improve low pass circuit, printed circuit board and the dielectric waveguide filter that distal end inhibits, low pass circuit includes the ontology that at least one strip line is formed, the ontology contains at least one input terminal and an output end, the ontology includes inductance and capacitor, and the inductance and capacitor combination form the low pass circuit.The invention has the advantages that can weaken input/output port elapse second harmonic position can toward farther place the coupling amplitude of the higher order resonances mode of Medium Wave Guide, and reduce the amplitude of 2 subharmonic by inductance and capacitor in optimization low pass circuit.
Description
Technical field
The application belongs to field of communication technology, can improve low pass circuit, the printing electricity that distal end inhibits more particularly to one kind
Road plate and dielectric waveguide filter.
Background technique
In recent years, with the fast development of space technology, works fine performance to wireless telecom equipment on spacecraft and
More stringent requirements are proposed for lesser volume, the integrated of wireless telecom equipment, miniaturization, high-performance, it is at low cost and be easy to plus
The advantages that work, has become the inexorable trend of domestic and international scientific research field development.For wireless communication system, filter is a kind of
Crucial radio-frequency devices.It has the function of dividing channel, screen signal, is a kind of important microwave device.In order to realize communication
Integration of equipments, miniaturization, high-performance, it is at low cost and easy to process the advantages that, multi-chip module (MCM), system on chip
(SOC), the new packing forms such as package system (SOP) have been suggested.In a wireless communication system, using modern encapsulation technology
Active circuit can be integrated.Although filter can also be made to realize in present package system using modern encapsulation technology to collect
Cheng Hua, but realize in order to meet the works fine performance of filter and the particular requirement of working principle, in circuit design miniaturization,
High performance feature is difficult to realize.And the rapid development of radio communication service results in relatively crowded microwave band and makes
Frequency band division is finer, and microwave spectrum resource day is becoming tight, and various microwave micron wave circuits, component and systematic difference are more next
More extensive, frequency interval constantly reduces, so that use multi-frequency working, thus also increasingly to the performance indicator of filter
It is high.And the quality of the performance of filter can have a direct impact the performance indicator of entire communication system.With science and technology
Development, field of new materials also obtained significant progress in terms of new process, and design volume is small, light-weight, performance is high, cost
Low RF/Microwave filter and other devices will be the trend of engineering design and market competition.This requires circuits one
Aspect will meet electricity function index, on the other hand also reduce the occupied space of circuit as far as possible.However, using tradition
Design method design filter construction size it is generally bigger, there is also limitations to a certain extent in performance indicator
Property, it cannot preferably realize the characteristics of minimizing with preferable working performance, it is impossible to meet wanting for modern wireless communication systems
It asks.Therefore, the passive circuit research of function admirable, high integration becomes work very crucial in modern wireless communication systems research
Make.
With the rapid development of radio communication service, frequency interval constantly reduces, and microwave spectrum resource day is becoming tight, various
Microwave micron wave circuit, component and systematic difference are more and more extensive, also higher and higher to the performance indicator of filter.Common
Filter there is have in passband energy loss, load effect are obvious, volume is big, weight is big, poor reliability, the scope of application are small,
It is at high cost, degree of suppression is low, integrated level is low and there is leakages.
Think technical effect to be achieved: meeting the works fine performance of filter and the particular requirement of working principle, thus
A kind of dielectric waveguide filter filter is designed, it has unobvious load effect, small in size, light-weight, good reliability, is applicable in model
Wide, at low cost, surface No leakage is enclosed, in passband the advantages that noenergy loss.
Now, what is more often selected in radio frequency, microwave circuit is LC filter, coaxial line filter, microstrip line filtering
Device, LTCC filter.
LC filter: it is primary or more can to eliminate certain for the filter circuit constituted using the Combination Design of inductance, capacitor and resistance
Subharmonic.The advantages that it has structure simple, low in cost, and operational reliability is higher, and operating cost is lower.But it can only be filtered
Except the harmonic wave in certain frequency range, influenced seriously by system impedance, there are the danger of Harmonics amplification and resonance, resonance point is deviated,
Effect reduce, probably due to overload and damage influenced by payload size.
Coaxial line filter: outer conductor interior diameter is unified, and inner conductor overall diameter is in the structure of stepped change.This structure group
The advantages that dress is simple, and properties of sample consistency is good when batch production, and insertion loss is small, and stopband is wide, and power capacity is big.But its
Volume is big, and there are serious frequency shift (FS) phenomenons with design simulation results for object test result
Microstripline filter: the electricity of lump component is replaced using open circuit stub in parallel or short circuit series connection stub
It is perhaps inductance to realize filter function.This filter design is simple, has high-performance, size is small, is easily integrated and processes
But its narrow bandwidth scope of application is small, and has leakage.
LTCC filter: the advantages of combining rear membrane technology and cofiring technology.The individually designed reduction of every layer of circuit was repaired
Journey is integrated with a variety of circuit engineerings such as number, simulation, radio frequency, microwave and embedded set passive device, reduces the complexity of assembly
Degree reduces insertion loss, the weight after reducing encapsulation.But it is unstable that there are performances, and the design cycle is long, at high cost.
Summary of the invention
The purpose of the present invention is to provide one kind can improve the low pass circuit that distal end inhibits, the prototype and tradition of this circuit
Low pass circuit it is consistent, it is the printed conductor between two ground planes of circuit board, it be one be placed in two layers conduction
Copper strips line among dielectric between plane, line spacing and electricity by changing the bending degree of this root copper strips line, after bending
The material of road plate forms the inductance capacitance of different parameters, realizes low-pass filtering, therefore it can be integrated with dielectric waveguide filter, no
Account for area, stability is high, and small in size, light-weight, the performance of filter after integrating is excellent, and insertion loss is small, and degree of suppression is high, can be with
Be suppressed to 6 times of cutoff frequency, there is no leakage and it is low in cost.
To achieve the above object, the invention provides the following technical scheme:
The embodiment of the present application discloses a kind of low pass circuit that can improve distal end and inhibit, and is formed comprising at least one strip line
Ontology, the ontology contain at least one input terminal and an output end, and the ontology includes inductance and capacitor, the inductance with
Capacitor combination forms the low pass circuit.
A kind of printed circuit board is also disclosed accordingly, and comprising above-mentioned low pass circuit, the low pass circuit is built in institute
It states in printed circuit board.
Preferably, in above-mentioned printed circuit board, two layers of conduction that the strip line is placed in the printed circuit board is flat
In face.
Preferably, in above-mentioned printed circuit board, the strip line forms inductance by changing thickness.
Preferably, in above-mentioned printed circuit board, the strip line is by being bent to form capacitor.
Preferably, in above-mentioned printed circuit board, the material of the strip line is copper.
Preferably, in above-mentioned printed circuit board, the printed circuit board includes layers of copper, dielectric layer and green oil layer.
It is furthermore preferred that the strip line is placed in the dielectric layer in above-mentioned printed circuit board.
A kind of dielectric waveguide filter is also disclosed, above-mentioned printed circuit board is included.
Compared with the prior art, the advantages of the present invention are as follows: by the inductance and capacitor in optimization low pass circuit, can subtract
Weak input/output port push away second harmonic position can toward farther place the coupling amplitude of the higher order resonances mode of Medium Wave Guide
It moves, and reduces the amplitude of 2 subharmonic.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in application, for those of ordinary skill in the art, without creative efforts,
It is also possible to obtain other drawings based on these drawings.
The distal end that improves that Fig. 1 show a 2.5 rank in the embodiment of the present invention inhibits low pass circuit；
Fig. 2 show multiple embodiments that low pass circuit in the embodiment of the present invention is integrated in printed circuit intralamellar part；
The emulation that Fig. 3 show the traditional sucrose waveguide filter of not integrated strip line low pass circuit in printed circuit board is bent
Line chart；
Fig. 4, which is shown, inhibits medium using the improvement distal end inside inventive tape line low pass circuit integrated printed-circuit board
The simulation curve figure of waveguide filter.
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 detailed retouch
It states, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the present invention
In embodiment, those of ordinary skill in the art's every other implementation obtained without making creative work
Example, shall fall within the protection scope of the present invention.
Refering to what is shown in Fig. 1, the low pass circuit that distal end inhibits can be improved, including by the thread ontology 1 of strip line copper strips, set
In in printed circuit board.
Ontology 1 includes 5 inductance 10,11,12,13,14,2 capacitors 21,22 and input terminal 2, output end 3.
More specifically, 5 inductance 10,11,12,13,14,2 capacitors 21,22 be built in printed circuit board 2 lead
In dielectric in electric layer, wherein 2 capacitors 21,22 are grounded, 3 external pads of input terminal 2 and output end are general for connecting
Logical dielectric waveguide filter.
More specifically, by adjusting copper strips line thickness, the inductance of varying strength is formed, to change size of current, thus
Change the signal frequency for passing through copper strips line.By adjusting the positive area after the bending of copper strips line, the distance of copper strips line, changes after bending
The size that power transformation is held.By changing printed circuit board material, change the size of capacitor.
More specifically, input signal is by the inductance formed by copper strips line, and since inductance leads to low frequency resistance high frequency, input is believed
Number most high-frequency signal is filtered out by inductance, and signal is transmitted downwards.
More specifically, the capacity earth that fold is formed by bending will be passed through by copper strips line, after the filtering of upper an inductance, also
It has a small amount of high-frequency signal to pass through, high frequency signal transmission to capacitor.Since capacitor leads to high frequency resistance low frequency and capacity earth, because
This high-frequency signal can pass through capacitor and be filtered, and low frequency signal not by capacitive filter, therefore cannot play low pass filtered by capacitor
The effect of wave.
It should be noted that the body construction is various informative, in addition to the structure described in Fig. 1 embodiment, further include
The structure type of similar Fig. 1 shown in Fig. 2.It is realized by changing copper strips line position, shape or order in printed circuit board
The method of the technical effect, belongs to scope of the present application.
Further, the material of strip line is preferably copper.It can be carried out good signal by strip line made of material of copper
Transmission, the distance between the thickness and width of copper strips line, the dielectric constant of medium and two layers of conductive plane are controllable, therefore copper
Characteristic impedance with line is also controllable.Because it has small in size, light-weight, bandwidth, Q value height, simple process, at low cost
The advantages that honest and clean, therefore copper is as the common material of strip line.
Dielectric waveguide filter uses traditional printed circuit board process in conventional technical means, by dielectric waveguide filter
Input/output port and printed circuit board micro-strip connect, and at its end welding coaxial connector formed input/output terminal
Mouthful, it is compared under same qualifications using two schemes below: identical appearance volume, same media material, identical outer
Portion's shield effectiveness, debugging index are consistent.
Join shown in Fig. 3, welds the Medium Wave Guide filter that coaxial connector forms input/output port for conventional printed circuit boards
The test curve figure of wave device, can following index as seen from the figure:
Centre frequency: 2595MHz；Bandwidth: 2515-2675MHz is set
Distal end after the 2950MHz of distal end inhibits not obvious enough, and loss is not big enough, effectively high-frequency signal cannot be inhibited to pass
It is defeated.
Join shown in Fig. 4, for dielectric waveguide filter that low pass circuit is built in printed circuit board is made in copper strips line
Test curve figure, can following index as seen from the figure:
Centre frequency: 2595MHz；Bandwidth: 2515-2675MHz is set
Distal end after the 3610MHz of distal end inhibits more obvious, and loss is larger, can effectively inhibit high frequency signal transmission.
Resulting data comparison is tested by both the above scheme, using the printing as built in copper strips line made low pass circuit
The dielectric waveguide filter of circuit board can be improved distal end and inhibit, and second harmonic position can be toward farther place passage and inhibitory effect adds
By force, examples detailed above is mainly reflected in the Out-of-band rejection index of 2950MHz-8500MHz.
And through overtesting, in the circuit printing plate of dielectric waveguide filter, by the rank of the thread low pass circuit of copper strips
Number is higher, and degree of suppression is better.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The above is only the specific embodiment of the application, it is noted that for the ordinary skill people of the art
For member, under the premise of not departing from the application principle, several improvements and modifications can also be made, these improvements and modifications are also answered
It is considered as the protection scope of the application.
Claims (9)
1. one kind can improve the low pass circuit that distal end inhibits, which is characterized in that include the ontology that at least one strip line is formed, institute
It states ontology and contains at least one input terminal and an output end, the ontology includes inductance and capacitor, the inductance and capacitance group
Conjunction forms the low pass circuit.
2. a kind of printed circuit board, which is characterized in that include low pass circuit described in claim 1, built in the low pass circuit
In the printed circuit board.
3. printed circuit board according to claim 2, which is characterized in that the strip line is placed in the printed circuit board
In two layers of conductive plane.
4. printed circuit board according to claim 2, which is characterized in that the strip line forms electricity by changing thickness
Sense.
5. printed circuit board according to claim 2, which is characterized in that the strip line is by being bent to form capacitor.
6. printed circuit board according to claim 2, which is characterized in that the material of the strip line is copper.
7. printed circuit board according to claim 2, which is characterized in that the printed circuit board includes layers of copper, dielectric
Layer and green oil layer.
8. printed circuit board according to claim 7, which is characterized in that the strip line is placed in the dielectric layer.
9. a kind of dielectric waveguide filter, which is characterized in that include any printed circuit board of claim 2-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910025200.5A CN109803485A (en) | 2019-01-11 | 2019-01-11 | Low pass circuit, printed circuit board and dielectric waveguide filter that distal end inhibits can be improved |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910025200.5A CN109803485A (en) | 2019-01-11 | 2019-01-11 | Low pass circuit, printed circuit board and dielectric waveguide filter that distal end inhibits can be improved |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109803485A true CN109803485A (en) | 2019-05-24 |
Family
ID=66557058
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910025200.5A Pending CN109803485A (en) | 2019-01-11 | 2019-01-11 | Low pass circuit, printed circuit board and dielectric waveguide filter that distal end inhibits can be improved |
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| CN (1) | CN109803485A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1065402A (en) * | 1996-06-26 | 1998-03-06 | Korea Electron Telecommun | Microstrip open stub line type low-pass filter and method of manufacturing the same |
| CN1366721A (en) * | 2000-01-31 | 2002-08-28 | 三菱电机株式会社 | Low-pass filter |
| CN101533938A (en) * | 2008-03-14 | 2009-09-16 | 鸿富锦精密工业（深圳）有限公司 | Low-pass filter |
| KR20100056146A (en) * | 2008-11-19 | 2010-05-27 | 한국전자통신연구원 | Low pass filter and method of designing thereof |
| CN102055050A (en) * | 2009-10-29 | 2011-05-11 | 鸿富锦精密工业（深圳）有限公司 | Band-pass filter |
| CN203039051U (en) * | 2013-01-04 | 2013-07-03 | 成都信息工程学院 | Microstrip low-pass 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 |
-
2019
- 2019-01-11 CN CN201910025200.5A patent/CN109803485A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1065402A (en) * | 1996-06-26 | 1998-03-06 | Korea Electron Telecommun | Microstrip open stub line type low-pass filter and method of manufacturing the same |
| CN1366721A (en) * | 2000-01-31 | 2002-08-28 | 三菱电机株式会社 | Low-pass filter |
| CN101533938A (en) * | 2008-03-14 | 2009-09-16 | 鸿富锦精密工业（深圳）有限公司 | Low-pass filter |
| KR20100056146A (en) * | 2008-11-19 | 2010-05-27 | 한국전자통신연구원 | Low pass filter and method of designing thereof |
| CN102055050A (en) * | 2009-10-29 | 2011-05-11 | 鸿富锦精密工业（深圳）有限公司 | Band-pass filter |
| CN203039051U (en) * | 2013-01-04 | 2013-07-03 | 成都信息工程学院 | Microstrip low-pass 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 |
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| CB02 | Change of applicant information |
Address after: 215634 Jiangsu Canqin Science and Technology Co., Ltd. No. 19 Jingang Road, Zhangjiagang Free Trade Zone, Suzhou City, Jiangsu Province Applicant after: Jiangsu Canqin Science and Technology Co., Ltd. Address before: Jingang road Suzhou 215634 Jiangsu province Zhangjiagang Free Trade Zone No. 19 Zhangjiagang bonded zone canqin science and Technology Co Ltd Applicant before: Zhangjiagang Bonded Area Canqin Technology Co., Ltd. |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190524 |
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