CN107895828A - 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
- CN107895828A CN107895828A CN201710941014.7A CN201710941014A CN107895828A CN 107895828 A CN107895828 A CN 107895828A CN 201710941014 A CN201710941014 A CN 201710941014A CN 107895828 A CN107895828 A CN 107895828A
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- China
- Prior art keywords
- transmission line
- line section
- absorption resistance
- end transmission
- resistance
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Classifications
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- 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, including：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 end points 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 for rationally setting each element, the present invention can obtain unreflected transmission line type wave filter, the filter function of band logical or high pass can be realized, the filter circuit that the structure is applied to 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 band based on transmission line structure
Logical and high-pass filter.
Background technology
Wave filter is a kind of electronic device, is widely used in various electronic systems.The device typically has two ports, permits
Perhaps the electric signal in passband is lossless or low damage passes through, and forbids the electric signal in suppressed frequency band to carry out between two ports
Transmission.
Existing wave filter is generally reflective.According to law of conservation of energy, the input electrical signal of input is such as located at
In passband, then transmit to output end；When input signal is located in stopband, then it is all-trans and is incident upon input, now output end no signal
Output.If reflection signal power is larger, reflex to after input, uncertain influence can be caused on circuit afterwards.Nothing
Reflective filter, as its name suggests, no matter in passband or stopband, the equal areflexia signal of its input or very little, and do not influence to lead to
Transmission response in band.Traditional reflectionless filter is typically realized using inductance, electric capacity and resistance, in microwave frequency band, device
Distributed effects it is more serious, realizing for inductance and electric capacity is extremely difficult, and corresponding reflectionless filter is difficult to, and is one
Individual technical barrier.
The content of the invention
The technical problems to be solved by the invention are to be directed to the defects of involved in background technology, there is provided one kind is based on biography
The areflexia band logical and high-pass filter of defeated cable architecture, solve that existing reflectionless filter working frequency is relatively low, 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, terminal
Short-circuited transmission line section, open end transmission line section, input port and output port；
One end of first absorption resistance one end with the second absorption resistance, one end phase of shorted end transmission line section respectively
Even, an end points of the other end respectively with input port, open end transmission line section side is connected；
The other end of second absorption resistance respectively with output port, another end points phase of open end transmission line section side
Even；
The other end ground connection of the shorted end transmission line section；
The resistance of first absorption resistance, the resistance of the second absorption resistance, the characteristic impedance of input port, the spy of output port
Property impedance all same；
The shorted end transmission line section and open end transmission line section have identical electrical length, and shorted end transmission line section
Characteristic impedance and open end transmission line section characteristic impedance product and the first absorption resistance resistance it is square equal.
It is described as areflexia band logical of the present invention based on transmission line structure and the further prioritization scheme of high-pass filter
First absorption resistance, the second absorption resistance are independent resistive element.
It is described as areflexia band logical of the present invention based on transmission line structure and the further prioritization scheme of high-pass filter
First absorption resistance, the second absorption resistance are one port network of the input impedance for pure resistance characteristic.
It is described as areflexia band logical of the present invention based on transmission line structure and the further prioritization scheme of high-pass filter
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 areflexia band logical of the present invention based on transmission line structure and the further prioritization scheme of high-pass filter
The electrical length of shorted end transmission line section includes to compensate additional length caused by the discontinuity effect of end short circuit, described
The electrical length of open end transmission line section includes to compensate additional length caused by 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 present invention compared with prior art, has following technique effect using above technical scheme：
1. simple in construction, be easy to processing and fabricating transmission line type reflectionless filter provided by the present invention, the wave filter uses
Two sections of transmission line sections and a pair of resistance realize filter function, and in the ideal case, full frequency band reflection coefficient is zero.
2. transmission line section of the present invention is applied to a variety of specific embodiments, such as microstrip line, coplanar ripple
Lead, the multi-conductor transmission lines such as parallel wire, coaxial line and the line of rabbet joint.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of areflexia band logical and high-pass filter of the present invention based on transmission line structure；
Fig. 2 is the performance diagram of the desired transmission coefficient that the present invention is calculated using ADS softwares and reflectance factor；
Fig. 3 is the circuit structure diagram for the specific implementation sample that the present invention is realized using microstrip line；
Fig. 4 is that the microstrip line that the present invention is calculated using IE3D softwares implements the transmission coefficient of sample wave filter and the spy of reflectance factor
Linearity curve figure.
In figure, the absorption resistances of 1- first, the absorption resistances of 2- second, 3- shorted end transmission lines, 4- open end transmission lines,
5- input ports, 6- output ports, 7- ends short-circuit micro-band transmission line section, 7- metal base plates, 8- grounding through hole, 9- medium bases
Piece.
Embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings：
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 port；
One end of first absorption resistance one end with the second absorption resistance, one end phase of shorted end transmission line section respectively
Even, an end points of the other end respectively with input port, open end transmission line section side is connected；
The other end of second absorption resistance respectively with output port, another end points phase of open end transmission line section side
Even；
The other end ground connection of the shorted end transmission line section；
The resistance of first absorption resistance, the resistance of the second absorption resistance, the characteristic impedance of input port, the spy of output port
Property impedance all same；
The shorted end transmission line section and open end transmission line section have identical electrical length, and shorted end transmission line section
Characteristic impedance and open end transmission line section characteristic impedance product and the first absorption resistance resistance it is square equal.
First absorption resistance, the second absorption resistance can be independent resistive element or input impedance is
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 wave filter.
The electrical length of the shorted end transmission line section includes for caused by the discontinuity effect of compensation end short circuit
Additional length, the electrical length of the open end transmission line section include to compensate caused by the discontinuity effect of terminal open circuit
Additional length.This additional length at two is different according to specific transmission line form selected when realizing.
By rationally setting the impedance value of each element, the present invention can obtain unreflected transmission line type wave filter, can
The filter function of band logical or high pass is realized, the filter circuit that the structure is applied to microwave frequency band realizes there is low cost, Yi Jia
Work and steady performance.
Wherein, 50 Ohm input port impedance and output port impedance is employed in the present embodiment, the present invention is not to it
It is defined.
When above-mentioned input impedance, output impedance are 50 Ohm, first absorption resistance, the value of the second absorption resistance
Also it 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
For 90 degree.
Using ADS simulation softwares, emulation is simulated to foregoing circuit schematic diagram, obtained S parameter curve such as Fig. 2 institutes
Show.From the transmission coefficient S in figure21Curve understands that at 1GHz, the wave filter forms first passband.Due to transmission
The periodicity effect of line, second parasitic passband is formd at 3GHz.According to line filter design principle, if with
1GHz is as reference frequency, it is also contemplated that this wave filter is a high-pass filter, specifically refers to Richard's conversion.It will be evident that
The reflectance factor S of the wave filter11It is zero in Whole frequency band.
Second embodiment of the present invention is described with reference to Fig. 3 and Fig. 4.
As shown in figure 3, using planar microstrip cable architecture, in the areflexia band logical and high-pass filter, input port is micro-
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.
On one piece of dielectric substrate, the back side of dielectric substrate is provided with and connect provided with metal base plate, front whole circuit production
Ground through hole, the first absorption resistance, the second absorption resistance, shorted end transmission line section, open end transmission line section, input port and
Output port enters row metal in dielectric substrate front, the end of shorted end transmission line section by grounding through hole and metal base plate
Change connection.
As shown in figure 4, using simulation software IE3D, the embodiment in Fig. 3 is emulated, obtained corresponding imitative
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, areflexia band logical and high-pass filter of the invention based on transmission line structure can realize unreflected height
Performance filter response, and circuit structure is simple, making easy to process.Therefore the present invention has a wide range of applications.
Those skilled in the art of the present technique are it is understood that unless otherwise defined, all terms used herein（Including skill
Art term and scientific terminology）With the general understanding identical meaning with the those of ordinary skill in art of the present invention.Also
It should be understood that those terms defined in such as general dictionary should be understood that with the context of prior art
The consistent meaning of meaning, and unless defined as here, will not be explained with the implication of idealization or overly formal.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not limited to this hair
It is bright, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., it should be included in the present invention
Protection domain within.
Claims (5)
1. areflexia band logical and high-pass filter based on transmission line structure, it is characterised 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 end of first absorption resistance one end with the second absorption resistance, one end phase of shorted end transmission line section respectively
Even, an end points of the other end respectively with input port, open end transmission line section side is connected；
The other end of second absorption resistance respectively with output port, another end points phase of open end transmission line section side
Even；
The other end ground connection of the shorted end transmission line section；
The resistance of first absorption resistance, the resistance of the second absorption resistance, the characteristic impedance of input port, the spy of output port
Property impedance all same；
The shorted end transmission line section and open end transmission line section have identical electrical length, and shorted end transmission line section
Characteristic impedance and open end transmission line section characteristic impedance product and the first absorption resistance resistance it is square equal.
2. areflexia band logical and high-pass filter according to claim 1 based on transmission line structure, it is characterised in that institute
State the first absorption resistance, the second absorption resistance is independent resistive element.
3. areflexia band logical and high-pass filter according to claim 1 based on transmission line structure, it is characterised in that institute
State the first absorption resistance, the second absorption resistance is one port network of the input impedance for pure resistance characteristic.
4. areflexia band logical and high-pass filter according to claim 1 based on transmission line structure, it is characterised 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. areflexia band logical and high-pass filter according to claim 1 based on transmission line structure, it is characterised in that institute
The electrical length for stating shorted end transmission line section includes for additional length, institute caused by the discontinuity effect of compensation end short circuit
The electrical length for stating open end transmission line section includes to compensate additional length caused by the discontinuity effect of terminal open circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710941014.7A CN107895828B (en) | 2017-10-11 | 2017-10-11 | Areflexia band logical and high-pass filter based on transmission line structure |
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| 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 |
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| CN107895828A true CN107895828A (en) | 2018-04-10 |
| CN107895828B CN107895828B (en) | 2019-06-28 |
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Cited By (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 |
| CN112234359A (en) * | 2020-09-17 | 2021-01-15 | 南京理工大学 | Reflection/absorption surface for terminating filter circuit to control electrical characteristics and design method |
| CN112909461A (en) * | 2021-01-25 | 2021-06-04 | 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 |
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| 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 |
| US20160126606A1 (en) * | 2014-11-05 | 2016-05-05 | Associated Universities, Inc. | Transmission Line Reflectionless Filters |
| CN107078708A (en) * | 2014-06-25 | 2017-08-18 | 联合大学公司 | The enhanced reflectionless filter topology of sub-network |
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2017
- 2017-10-11 CN CN201710941014.7A patent/CN107895828B/en active Active
Patent Citations (5)
| 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 |
| US20160126606A1 (en) * | 2014-11-05 | 2016-05-05 | Associated Universities, Inc. | Transmission Line Reflectionless Filters |
Cited By (5)
| 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 |
| CN112234359A (en) * | 2020-09-17 | 2021-01-15 | 南京理工大学 | Reflection/absorption surface for terminating filter circuit to control electrical characteristics and design method |
| CN112909461A (en) * | 2021-01-25 | 2021-06-04 | 北京邮电大学 | Complementary duplex structure full-band absorption dual-frequency band-pass filter |
| 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 |
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| Publication number | Publication date |
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| CN107895828B (en) | 2019-06-28 |
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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. |
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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 |
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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 |