CN107895828B - Areflexia band logical and high-pass filter based on transmission line structure - Google Patents
Areflexia band logical and high-pass filter based on transmission line structure Download PDFInfo
- Publication number
- CN107895828B CN107895828B CN201710941014.7A CN201710941014A CN107895828B CN 107895828 B CN107895828 B CN 107895828B CN 201710941014 A CN201710941014 A CN 201710941014A CN 107895828 B CN107895828 B CN 107895828B
- Authority
- CN
- China
- Prior art keywords
- transmission line
- line section
- end transmission
- absorption resistance
- pass filter
- 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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
Abstract
The invention discloses a kind of areflexia band logical and high-pass filter based on transmission line structure, it include: two absorption resistances, quarter-wave termination short-circuited transmission line section, quarter-wave termination open circuited transmission line section and two input/output ports, described two absorption resistances have a public point and two individual end points close to placing；The quarter-wave termination short-circuited transmission line section is connected on the public point of two absorption resistances；Two endpoints of the quarter-wave termination open circuited transmission line section are connected with two individual end points of two absorption resistances respectively；Described two input/output ports are connected to the individual end points of two absorption resistances.By the impedance value that each element is rationally arranged, the present invention can obtain unreflected transmission line type filter, it can be realized the filter function of band logical or high pass, the filter circuit which is suitable for microwave frequency band realizes there is low cost, easy processing and steady performance.
Description
Technical field
The present invention relates to the technical field of microwave radio circuit more particularly to a kind of areflexia bands based on transmission line structure
Logical and high-pass filter.
Background technique
Filter is a kind of electronic device, is widely used in various electronic systems.Generally there are two ports for the device, permit
Perhaps the electric signal in passband is lossless or low damage passes through, and the electric signal in suppressed frequency band is forbidden to carry out between two ports
Transmission.
Existing filter is generally reflective.According to law of conservation of energy, the input electrical signal of input terminal is such as located at
In passband, then output end is transmitted to；When input signal is located in stopband, then it is all-trans and is incident upon input terminal, at this time output end no signal
Output.If reflection signal power is larger, reflex to after input terminal, uncertain influence can be caused on circuit later.Nothing
Reflective filter, as its name suggests, no matter in passband or stopband, the equal areflexia signal of input terminal or very little, and do not influence to lead to
Transmission response in band.Traditional reflectionless filter generally utilizes inductance, capacitor and resistance to realize, in microwave frequency band, device
Distributed effects it is more serious, it is one that the realization of inductance and capacitor is extremely difficult, and corresponding reflectionless filter is difficult to realize
A technical problem.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of based on biography for defect involved in background technique
The areflexia band logical and high-pass filter of defeated cable architecture, solve that existing reflectionless filter working frequency is lower, is not suitable for penetrating
The problem of frequency microwave frequency band.
The present invention uses following technical scheme to solve above-mentioned technical problem:
Areflexia band logical and high-pass filter based on transmission line structure, including the first absorption resistance, the second absorption resistance,
Shorted end transmission line section, open end transmission line section, input port and output port；
One endpoint of first absorption resistance respectively with endpoint, a shorted end transmission line of the second absorption resistance
One end of section is connected, another endpoint is connected with an endpoint of input port, open end transmission line section side respectively；
Another endpoint of second absorption resistance respectively with output port, open end transmission line section side it is another
A endpoint is connected；
The other end of the shorted end transmission line section is grounded；
The resistance value of first absorption resistance, the resistance value of the second absorption resistance, the characteristic impedance of input port, output port
Characteristic impedance it is all the same；
The shorted end transmission line section and open end transmission line section electrical length having the same, and terminal short circuit transmits
The product of the characteristic impedance of the characteristic impedance and open end transmission line section of line section and square of the first absorption resistance resistance value
It is equal.
It is described as the present invention is based on the further prioritization scheme of areflexia band logical and high-pass filter of transmission line structure
First absorption resistance, the second absorption resistance are independent resistive element.
It is described as the present invention is based on the further prioritization scheme of areflexia band logical and high-pass filter of transmission line structure
First absorption resistance, the second absorption resistance are the one port network that input impedance is pure resistance characteristic.
It is described as the present invention is based on the further prioritization scheme of areflexia band logical and high-pass filter of transmission line structure
The electrical length of shorted end transmission line section and open end transmission line section in the areflexia band logical and high-pass filter first
It is quarter-wave at passband central frequency.
It is described as the present invention is based on the further prioritization scheme of areflexia band logical and high-pass filter of transmission line structure
The electrical length of shorted end transmission line section includes additional length caused by compensate the discontinuity effect of end short circuit, described
The electrical length of open end transmission line section includes additional length caused by compensate the discontinuity effect of terminal open circuit.This two
The additional length at place is different according to specific transmission line form selected when realizing.
The invention adopts the above technical scheme compared with prior art, has following technical effect that
1. transmission line type reflectionless filter provided by the present invention, structure is simple, production easy to process, the filter
Filter function is realized using two sections of transmission line sections and a pair of of resistance, and in the ideal case, full frequency band reflection coefficient is equal
It is zero.
2. transmission line section of the present invention is suitable for a variety of specific embodiments, such as microstrip line, coplanar wave
It leads, the multi-conductor transmission lines such as parallel wire, coaxial line and the line of rabbet joint.
Detailed description of the invention
Fig. 1 is that the present invention is based on the areflexia band logical of transmission line structure and the circuit diagrams of high-pass filter；
Fig. 2 is the performance diagram of desired transmission coefficient and reflection coefficient that the present invention is calculated using ADS software；
Fig. 3 is the circuit structure diagram for the specific implementation sample that the present invention is realized using microstrip line；
Fig. 4 is the transmission coefficient and reflection coefficient that the present invention implements sample filter using the microstrip line that IE3D software calculates
Performance diagram.
In figure, the first absorption resistance of 1-, the second absorption resistance of 2-, 3- shorted end transmission line, 4- open end transmission line,
5- input port, 6- output port, the end 7- short-circuit micro-band transmission line section, 7- metal base plate, 8- grounding through hole, 9- medium base
Piece.
Specific embodiment
Technical solution of the present invention is described in further detail with reference to the accompanying drawing:
As shown in Figure 1, the invention discloses a kind of areflexia band logical and high-pass filter based on transmission line structure, including
First absorption resistance, the second absorption resistance, shorted end transmission line section, open end transmission line section, input port and output end
Mouthful；
One endpoint of first absorption resistance respectively with endpoint, a shorted end transmission line of the second absorption resistance
One end of section is connected, another endpoint is connected with an endpoint of input port, open end transmission line section side respectively；
Another endpoint of second absorption resistance respectively with output port, open end transmission line section side it is another
A endpoint is connected；
The other end of the shorted end transmission line section is grounded；
The resistance value of first absorption resistance, the resistance value of the second absorption resistance, the characteristic impedance of input port, output port
Characteristic impedance it is all the same；
The shorted end transmission line section and open end transmission line section electrical length having the same, and terminal short circuit transmits
The product of the characteristic impedance of the characteristic impedance and open end transmission line section of line section and square of the first absorption resistance resistance value
It is equal.
First absorption resistance, the second absorption resistance can be independent resistive element, are also possible to input impedance and are
The one port network of pure resistance characteristic.
The electrical length of the shorted end transmission line section and open end transmission line section is in the areflexia band logical and high pass
It is quarter-wave at first passband central frequency of filter.
Caused by the electrical length of the shorted end transmission line section includes the discontinuity effect for compensation end short circuit
Additional length, caused by the electrical length of the open end transmission line section includes the discontinuity effect for compensation terminal open circuit
Additional length.This additional length at two is different according to specific transmission line form selected when realizing.
By the way that the impedance value of each element is rationally arranged, the present invention can obtain unreflected transmission line type filter, can
Realize that the filter function of band logical or high pass, the filter circuit which is suitable for microwave frequency band realize there is low cost, Yi Jia
Work and steady performance.
Wherein, the input port impedance and output port impedance of 50 Ohm are used in the present embodiment, the present invention is not to it
It is defined.
When above-mentioned input impedance, output impedance are 50 Ohm, the value of first absorption resistance, the second absorption resistance
It also is 50 Ohm；The characteristic impedance of the shorted end transmission line section is 25 Ohm, the characteristic of the open end transmission line section
Impedance is 100 Ohm.The electrical length of the shorted end transmission line section and the open end transmission line section is equal in 1 GHz
It is 90 degree.
Using ADS simulation software, emulation is simulated to foregoing circuit schematic diagram, obtained S parameter curve such as Fig. 2 institute
Show.From the transmission coefficient S in figure21For curve it is found that at 1GHz, which forms first passband.Due to transmission line
Periodical effect forms second parasitic passband at 3GHz.According to line filter design principle, if made with 1GHz
Richard's transformation is specifically referred to it is also contemplated that this filter is a high-pass filter for reference frequency.It will be evident that the filtering
The reflection coefficient S of device11It is zero in Whole frequency band.
Second embodiment of the invention is described below with reference to Fig. 3 and Fig. 4.
As shown in figure 3, in the areflexia band logical and high-pass filter, input port is micro- using planar microstrip cable architecture
Band line input port, output port are microstrip line output port, and shorted end transmission line section uses microstrip line, open-end transmission
Line section uses parallel double-conductor transmission line section.
Entire circuit production is on one piece of dielectric substrate, and the back side of dielectric substrate is equipped with metal base plate, front is equipped with and connects
Ground through-hole, the first absorption resistance, the second absorption resistance, shorted end transmission line section, open end transmission line section, input port and
For output port in dielectric substrate front, the end of shorted end transmission line section carries out metal by grounding through hole and metal base plate
Change connection.
As shown in figure 4, being emulated using simulation software IE3D to the embodiment in Fig. 3, obtain imitative accordingly
True curve.
As shown in figure 4, the circuit has a passband at 2GHz, in the amplitude S of Whole frequency band reflection coefficient11Respectively less than
0.1, close to areflexia.
To sum up, the areflexia band logical and high-pass filter of the invention based on transmission line structure can be realized unreflected height
Performance filter response, and circuit structure is simple, production easy to process.Therefore the present invention has a wide range of applications.
Those skilled in the art can understand that unless otherwise defined, all terms used herein (including skill
Art term and scientific term) there is meaning identical with the general understanding of those of ordinary skill in fields of the present invention.Also
It should be understood that those terms such as defined in the general dictionary should be understood that have in the context of the prior art
The consistent meaning of meaning will not be explained in an idealized or overly formal meaning and unless defined as here.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not limited to this hair the foregoing is merely a specific embodiment of the invention
Bright, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the present invention
Protection scope within.
Claims (5)
1. areflexia band logical and high-pass filter based on transmission line structure, which is characterized in that including the first absorption resistance, second
Absorption resistance, shorted end transmission line section, open end transmission line section, input port and output port；
One endpoint of first absorption resistance respectively with an endpoint of the second absorption resistance, shorted end transmission line section
One end is connected, another endpoint is connected with an endpoint of input port, open end transmission line section side respectively；
Another endpoint of second absorption resistance another end with output port, open end transmission line section side respectively
Point is connected；
The other end of the shorted end transmission line section is grounded；
The resistance value of first absorption resistance, the resistance value of the second absorption resistance, the characteristic impedance of input port, output port spy
Property impedance is all the same；
The shorted end transmission line section and open end transmission line section electrical length having the same, and shorted end transmission line section
Characteristic impedance and open end transmission line section characteristic impedance product and the first absorption resistance resistance value it is square equal.
2. the areflexia band logical and high-pass filter according to claim 1 based on transmission line structure, which is characterized in that institute
State the first absorption resistance, the second absorption resistance is independent resistive element.
3. the areflexia band logical and high-pass filter according to claim 1 based on transmission line structure, which is characterized in that institute
State the first absorption resistance, the second absorption resistance is that input impedance is that there are two the one port networks of endpoint for the pure tool for hindering characteristic.
4. the areflexia band logical and high-pass filter according to claim 1 based on transmission line structure, which is characterized in that institute
The electrical length of shorted end transmission line section and open end transmission line section is stated the of the areflexia band logical and high-pass filter
It is quarter-wave at one passband central frequency.
5. the areflexia band logical and high-pass filter according to claim 1 based on transmission line structure, which is characterized in that institute
The electrical length for stating shorted end transmission line section includes additional length caused by compensate the discontinuity effect of end short circuit, institute
The electrical length for stating open end transmission line section includes additional length caused by compensate the discontinuity effect of terminal open circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710941014.7A CN107895828B (en) | 2017-10-11 | 2017-10-11 | Areflexia band logical and high-pass filter based on transmission line structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710941014.7A CN107895828B (en) | 2017-10-11 | 2017-10-11 | Areflexia band logical and high-pass filter based on transmission line structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107895828A CN107895828A (en) | 2018-04-10 |
| CN107895828B true CN107895828B (en) | 2019-06-28 |
Family
ID=61803473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710941014.7A Active CN107895828B (en) | 2017-10-11 | 2017-10-11 | Areflexia band logical and high-pass filter based on transmission line structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107895828B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110391790A (en) * | 2019-07-01 | 2019-10-29 | 普联技术有限公司 | A kind of absorption high-pass filter |
| CN112234359B (en) * | 2020-09-17 | 2022-06-24 | 南京理工大学 | Reflection/absorption surface for terminating filter circuit to control electrical characteristics and design method |
| CN112909461B (en) * | 2021-01-25 | 2021-08-03 | 北京邮电大学 | Complementary duplex structure full-band absorption dual-frequency band-pass filter |
| CN113346860A (en) * | 2021-05-12 | 2021-09-03 | 南京邮电大学 | Bandwidth-adjustable non-reflection filter of open-circuit short-circuit mixed branch transmission line |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11298202A (en) * | 1998-04-09 | 1999-10-29 | Murata Mfg Co Ltd | Band pass filter and double multiplication circuit |
| CN102365784A (en) * | 2009-02-09 | 2012-02-29 | 联合大学公司 | Reflectionless filters |
| CN103259501A (en) * | 2013-05-31 | 2013-08-21 | 电子科技大学 | Band elimination filter for communication system |
| CN107078708A (en) * | 2014-06-25 | 2017-08-18 | 联合大学公司 | The enhanced reflectionless filter topology of sub-network |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016073293A2 (en) * | 2014-11-05 | 2016-05-12 | Associated Universities, Inc. | Transmission line reflectionless filters |
-
2017
- 2017-10-11 CN CN201710941014.7A patent/CN107895828B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11298202A (en) * | 1998-04-09 | 1999-10-29 | Murata Mfg Co Ltd | Band pass filter and double multiplication circuit |
| CN102365784A (en) * | 2009-02-09 | 2012-02-29 | 联合大学公司 | Reflectionless filters |
| CN103259501A (en) * | 2013-05-31 | 2013-08-21 | 电子科技大学 | Band elimination filter for communication system |
| CN107078708A (en) * | 2014-06-25 | 2017-08-18 | 联合大学公司 | The enhanced reflectionless filter topology of sub-network |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107895828A (en) | 2018-04-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107910622B (en) | The resistance of areflexia band and low-pass filter based on transmission line structure | |
| CN107895828B (en) | Areflexia band logical and high-pass filter based on transmission line structure | |
| CN106972233A (en) | A kind of four tunnel filtering type power splitters based on three line coupled structures | |
| CN105529515B (en) | A kind of tunable band-pass bandstop filter based on open circuit minor matters loading | |
| CN105552494B (en) | A kind of adjustable plane bandpass and band-rejection filter | |
| CN110492214A (en) | The power splitters such as square coaxial transmission line Terahertz | |
| CN205621831U (en) | Adjustable band pass filter of dual -frenquency | |
| CN103367845A (en) | Ultra-wideband micro-strip balance filter | |
| CN101997149B (en) | Electromagnetic interference eliminator with bandpass filtering function | |
| CN109873618A (en) | A kind of high-power lamped element power splitter with -45 ° of phase delay | |
| CN104659450B (en) | A kind of broadband bandpass filter based on cross resonator | |
| CN110247145B (en) | Bandwidth-adjustable broadband filtering balun with in-band good matching and isolation | |
| CN109742497A (en) | A kind of four port reflectionless filter of transmission line | |
| CN109888441A (en) | The adjustable balanced type model filters power splitter of bandwidth | |
| CN105932378B (en) | A kind of plane that bandwidth is controllable tunable band-pass-bandstop filter | |
| CN203674352U (en) | Broadband difference band pass filter based on cross-shaped resonator | |
| CN104953216A (en) | Power processing circuit and multipath amplification circuit | |
| US8922298B2 (en) | Method and apparatus for cable emulation | |
| CN107275742A (en) | Work(filter-divider based on resonant ring | |
| US20180248243A1 (en) | Filtering Unit and Filter | |
| Breitbarth et al. | Absorptive near-Gaussian low pass filter design with applications in the time and frequency domain | |
| CN104577273B (en) | Plane low pass band logical double frequency filter | |
| JP2018531560A6 (en) | Filtering device and filter | |
| DE10202731A1 (en) | Nonreciprocal circuit device and communication device | |
| CN204375891U (en) | Plane lower passband leads to double frequency 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 | ||
| CB02 | Change of applicant information |
Address after: No. 66, New Model Road, Gulou District, Nanjing City, Jiangsu Province, 210000 Applicant after: Nanjing Post & Telecommunication Univ. Address before: 210046 9 Wen Yuan Road, Ya Dong new town, Nanjing, Jiangsu. Applicant before: Nanjing Post & Telecommunication Univ. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20180410 Assignee: Nanjing University of Posts and Telecommunications Nantong Institute Limited Assignor: Nanjing Post & Telecommunication Univ. Contract record no.: X2019980001260 Denomination of invention: Non-reflection band-pass and high-pass filter based on transmission line structure Granted publication date: 20190628 License type: Common License Record date: 20191224 |
|
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EC01 | Cancellation of recordation of patent licensing contract |
Assignee: NANJING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS NANTONG INSTITUTE Co.,Ltd. Assignor: NANJING University OF POSTS AND TELECOMMUNICATIONS Contract record no.: X2019980001260 Date of cancellation: 20220304 |
|
| EC01 | Cancellation of recordation of patent licensing contract |