CN109742497A - A kind of four port reflectionless filter of transmission line - Google Patents
A kind of four port reflectionless filter of transmission line Download PDFInfo
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- CN109742497A CN109742497A CN201910154578.5A CN201910154578A CN109742497A CN 109742497 A CN109742497 A CN 109742497A CN 201910154578 A CN201910154578 A CN 201910154578A CN 109742497 A CN109742497 A CN 109742497A
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Abstract
The invention discloses four port reflectionless filters of transmission line, minor matters line is transmitted in the quarter-wave termination short circuit in parallel of two half wavelength transmission minor matters line two sides, quarter-wave open-end of connecting on the outside of quarter-wave termination short circuit transmission minor matters line transmits minor matters line, constitutes two groups of band logical branches；The two sides of a two half wavelength transmission minor matters lines quarter-wave termination open-circuit transfer minor matters line in parallel, in one quarter-wave shorted end transmission line section of quarter-wave termination open-circuit transfer minor matters line two sides series connection, constitutes two groups of bands and hinder branches；Two groups of band logical branches, two groups of band resistance branches are sequentially connected end to end, and form closed loop configuration, phase inverter is added in any point cascade on loop main line.Stopband reflection signal bring, which can be effectively reduced, in the present invention influences, and working frequency is higher, is suitable for frequency microwave frequency range, while having preferable band logical and the filtering characteristic with resistance.
Description
Technical field
The present invention relates to a kind of filters, more particularly to a kind of four port reflectionless filter of transmission line.
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
Goal of the invention: the object of the present invention is to provide a kind of four port reflectionless filters of transmission line, solve existing without anti-
Penetrate that filter working frequency is lower, is not suitable for the problem of frequency microwave frequency range.
Technical solution: four port reflectionless filter of transmission line of the present invention includes first port, second port,
Three ports, the 4th port, four quarter-wave termination open-circuit transfer minor matters lines, four quarter-wave termination short circuits pass
Defeated minor matters line, four half wavelength transmission minor matters lines, four quarter-wave terminations open circuit minor matters lines, four four/
One wavelength shorted end transmission line section, phase inverter；The two sides each in parallel one of described two half wavelength transmission minor matters lines
Minor matters line is transmitted in a quarter-wave termination short circuit, connects respectively on the outside of quarter-wave termination short circuit transmission minor matters line
One quarter-wave open-end transmits minor matters line, constitutes the first band logical branch, the second band logical branch；The another two
The each quarter-wave termination open-circuit transfer minor matters line in parallel in the two sides of half wavelength transmission minor matters line, at four points
One of wavelength open-end transmission minor matters line on the outside of respectively connect a quarter-wave shorted end transmission line section, constitute
First band hinders branch, the second band resistance branch；The first band logical branch, first band resistance branch, the second band logical branch, the second band resistance
Branch is sequentially connected end to end, and forms a closed loop configuration, and phase inverter is added in any point cascade on closed loop configuration loop main line；Institute
State first port, second port, third port, the 4th port respectively connect the common point of a closed loop configuration, the two of each port
Side is respectively a band logical branch and a band resistance branch.It is added to inverter series on closed loop configuration loop main line any
A bit.
Optimally, in order to enable each branch structure is symmetrical, so as to carry out bidirectional filtering.Four a quarters
The impedance value that wavelength open-end transmits minor matters line is identical, the impedance value of four quarter-wave termination short circuit transmission minor matters lines
Identical, the impedance value of four halfs wavelength transmission minor matters line is identical, four quarter-wave terminations open circuit
The impedance value of minor matters line is identical, and the impedance value of four quarter-wave terminations short-circuited transmission line section is identical.
In order to which stopband reflection signal to be completely consumed, the band logical branch and the filtering characteristic with resistance branch are completely mutually
It mends, centre frequency having the same.
Minor matters line, four are transmitted in the quarter-wave termination open-circuit transfer minor matters line, quarter-wave termination short circuit
/ mono- wavelength open-end minor matters line, quarter-wave termination short-circuited transmission line section electrical length at four end of transmission line
It is quarter-wave at the centre frequency of mouth reflectionless filter, the electrical length of the transmission minor matters line is in the transmission line four
It is half wavelength at the centre frequency of port reflectionless filter.
The electrical length of the quarter-wave termination open-circuit transfer minor matters line, quarter-wave termination open circuit minor matters line
It include additional length caused by compensate the discontinuity effect of terminal open circuit, the quarter-wave termination short circuit transmission
Minor matters line, quarter-wave termination short-circuited transmission line section electrical length include for compensate end short circuit discontinuity effect
Caused additional length.This additional length at two is different according to specific transmission line form selected when realizing.
The first port, second port, third port, the 4th port can not only be used for output port, also can be used as defeated
Inbound port.
The band logical branch can carry out high-pass filtering, and the band resistance branch can carry out low-pass filtering.
In order to improve filter areflexia filtering characteristic, and since required precision of the structure for component value is very high, because
Component value is calculated by software in this, combines with structure, and filter is made to obtain the effect of approximate areflexia filtering.It is described
Input port (1), output port (2), output port (3) and output port (4) impedance value be 1Ohm；The a quarter
The impedance value of wavelength open-end transmission minor matters line is 1.5693Ohm, and minor matters line is transmitted in quarter-wave termination short circuit
Impedance value is 0.6242Ohm, and the impedance value of half wavelength transmission minor matters line is 1.3899Ohm, and quarter-wave is whole
The impedance value of end open circuit minor matters line is 0.6242Ohm, and the impedance value of quarter-wave termination short-circuited transmission line section is
1.5693Ohm。
Symmetrical passive transmission line network based on four ports can be with after special topology design and element assignment
Realize that the reflection coefficient in full frequency band is 0, and either port is complementary respectively to the transmission response of its adjacent both ends mouth, such as:
Low pass and high pass, band logical and with resistance.
The utility model has the advantages that stopband reflection signal bring, which can be effectively reduced, in (1) present invention influences；(2) working frequency it is higher,
Suitable for frequency microwave frequency range；(3) there is preferable band logical (high pass) and the filtering characteristic with resistance (low pass) simultaneously.(4) pass through
After impedance transformation, filter can be adapted for the occasion of other port Impedances.
Detailed description of the invention
Fig. 1 is the circuit diagram of four port reflectionless filter of transmission line of the invention；
Fig. 2 is transmission coefficient and reflection of the present invention using the four port reflectionless filter of transmission line of ADS software calculating
The performance diagram of coefficient；
Fig. 3 is the circuit diagram that phase inverter is located at other positions；
Fig. 4 bit Inverting device is located at the circuit diagram of another location.
Specific embodiment
Embodiment 1:
The centre frequency of four port reflectionless filter of transmission line is set as 1GHz by the present embodiment.
As shown in Figure 1, there are four ports for four port reflectionless filter of the transmission line tool of the present embodiment, it is first end respectively
Mouth 1, second port 2, third port 3, the 4th port 4, wherein first port is as input port, its excess-three port as defeated
Exit port.It further include four quarter-wave termination open-circuit transfer minor matters lines, 5, four quarter-wave termination short circuit transmission
6, four, minor matters line, 7, four, half wavelength transmission minor matters line quarter-wave termination is opened a way 8, four four points of minor matters line
One of wavelength shorted end transmission line section 9, phase inverter 10.
Wherein, each quarter-wave termination in parallel in the two sides of two half wavelength transmission minor matters lines 7 is short
Minor matters line 6 is transmitted on road, and in 6 outside of quarter-wave termination short circuit transmission minor matters line, series connection one is quarter-wave respectively
Open-end transmits minor matters line 5, constitutes the first band logical branch, the second band logical branch；The middle and upper part Fig. 1 is the first band logical branch,
Lower part is the second band logical branch.The each a quarter in parallel in the two sides of another two half wavelength transmission minor matters line 7
Wavelength open-end transmits minor matters line 8, connects one four points respectively in 8 outside of quarter-wave termination open-circuit transfer minor matters line
One of wavelength shorted end transmission line section 9, constitute first band resistance branch, second band resistance branch；Left side is first band in Fig. 1
Branch is hindered, right side is the second band resistance branch.First band logical branch, first band resistance branch, the second band logical branch, the second band resistance branch
Road is sequentially connected end to end, and forms a closed loop configuration.First port 1, second port 2, third port 3, the 4th respectively connection of port 4
The common point of one closed loop configuration, the two sides of each port are respectively a band logical branch and a band resistance branch.First band
Right end one phase inverter 10 of series connection of quarter-wave open-end transmission minor matters line 5 on the right side of logical branch, phase inverter 10
Right end is connected with second port 2.
Band logical branch can carry out high-pass filtering, and band resistance branch can carry out low-pass filtering.
Wherein, the impedance value of quarter-wave termination open-circuit transfer minor matters line 5 is 1.5693Ohm, quarter-wave
The impedance value of long terminal short circuit transmission minor matters line 6 is 0.6242Ohm, and the impedance value of half wavelength transmission minor matters line 7 is
1.3899Ohm, the impedance value of quarter-wave termination open circuit minor matters line 8 are 0.6242Ohm, quarter-wave termination short circuit
The impedance value of transmission line section 9 is 1.5693Ohm.
Band logical branch and with resistance branch filtering characteristic be complete complementary, centre frequency having the same.
Wherein, quarter-wave termination open-circuit transfer minor matters line 5, quarter-wave termination short circuit transmission minor matters line 6,
Quarter-wave termination open a way minor matters line 8, quarter-wave termination short-circuited transmission line section 9 electrical length in the transmission line
It is quarter-wave at the centre frequency of four port reflectionless filters, the electrical length of the transmission minor matters line 7 is in the biography
It is half wavelength at the centre frequency of defeated four port reflectionless filter of line.
The electrical length packet of quarter-wave termination open-circuit transfer minor matters line 5, quarter-wave termination open circuit minor matters line 8
Additional length caused by compensate the discontinuity effect of terminal open circuit is included, branch is transmitted in the quarter-wave termination short circuit
Nodel line 6, quarter-wave termination short-circuited transmission line section 9 electrical length include for compensate end short circuit discontinuity effect
Caused additional length.This additional length at two is different according to specific transmission line form selected when realizing.
Using ADS simulation software, analog simulation is carried out to the circuit diagram of the present embodiment, obtained S parameter curve is such as
Shown in Fig. 2, S11 is signal reflex coefficient in figure, and S12 and S13 are signal transmission coefficient.From figure 2 it can be seen that curve S12
Bandpass characteristics is showed, curve S13 shows band-stop response, i.e., the filter has band logical and simultaneously with two kinds of filtering spies of resistance
Property, and two kinds of filtering characteristic effects are preferable.Further it can be seen that the reflection coefficient that S11 is presented has descended to the left side -75dB
The right side has been able to approximation and regards as there is no reflection, and can effectively reduce stopband reflection signal bring influences.
Embodiment 2:
The centre frequency of four port reflectionless filter of transmission line is set as 1GHz by the present embodiment.
As shown in figure 3, the two sides of two half wavelength transmission minor matters lines 7 are one four in parallel each in the present embodiment
/ mono- wavelength terminal short circuit transmits minor matters line 6, connects one respectively in quarter-wave termination short circuit transmission minor matters line 6 outside
A quarter-wave open-end transmits minor matters line 5, constitutes the first band logical branch, the second band logical branch；The middle and upper part Fig. 3
For the first band logical branch, lower part is the second band logical branch.The two sides of another two half wavelength transmission minor matters line 7 it is each simultaneously
Join a quarter-wave termination open-circuit transfer minor matters line 8, divides on the outside of quarter-wave termination open-circuit transfer minor matters line 8
Not Chuan Lian a quarter-wave shorted end transmission line section 9, constitute first band resistance branch, second band resistance branch；In Fig. 3
Left side is first band resistance branch, and right side is the second band resistance branch.First band logical branch, first band hinder branch, the second band logical
Branch, the second band resistance branch are sequentially connected end to end, and form a closed loop configuration.First port 1, second port 2, third port 3,
4th port 4 respectively connects the common point of a closed loop configuration, and the two sides of each port are respectively a band logical branch and one
Band resistance branch.The right end series connection phase inverter 10 of half wavelength transmission minor matters line 7 among first band logical branch, phase inverter 10
Right side is connected with quarter-wave termination short circuit transmission minor matters line 6.Band logical branch can carry out high-pass filtering, and band resistance branch can
To carry out low-pass filtering.
Component value in the present embodiment is same as Example 1.Using ADS simulation software, to the circuit theory of the present embodiment
Figure carries out analog simulation, and reflection coefficient has descended to -75dB or so, can approximation regard that there is no reflections as.
Embodiment 3:
The centre frequency of four port reflectionless filter of transmission line is set as 1GHz by the present embodiment.
As shown in figure 4, the two sides of two half wavelength transmission minor matters lines 7 are one four in parallel each in the present embodiment
/ mono- wavelength terminal short circuit transmits minor matters line 6, connects one respectively in quarter-wave termination short circuit transmission minor matters line 6 outside
A quarter-wave open-end transmits minor matters line 5, constitutes the first band logical branch, the second band logical branch；The middle and upper part Fig. 4
For the first band logical branch, lower part is the second band logical branch.The two sides of another two half wavelength transmission minor matters line 7 it is each simultaneously
Join a quarter-wave termination open-circuit transfer minor matters line 8, divides on the outside of quarter-wave termination open-circuit transfer minor matters line 8
Not Chuan Lian a quarter-wave shorted end transmission line section 9, constitute first band resistance branch, second band resistance branch；In Fig. 4
Left side is first band resistance branch, and right side is the second band resistance branch.First band logical branch, first band hinder branch, the second band logical
Branch, the second band resistance branch are sequentially connected end to end, and form a closed loop configuration.First port 1, second port 2, third port 3,
4th port 4 respectively connects the common point of a closed loop configuration, and the two sides of each port are respectively a band logical branch and one
Band resistance branch.The second upper end series connection phase inverter 10 with the half wavelength transmission minor matters line 7 among resistance branch, phase inverter 10
The other side is connected with quarter-wave termination open-circuit transfer minor matters line 8.Band logical branch can carry out high-pass filtering, band resistance branch
It can carry out low-pass filtering.
Component value in the present embodiment is same as Example 1.Using ADS simulation software, to the circuit theory of the present embodiment
Figure carries out analog simulation, and reflection coefficient has descended to -75dB or so, can approximation regard that there is no reflections as.
Similarly, the component structure on protection circuit loop wire main road and value are constant, and on closed loop configuration loop main line
Phase inverter is added in other positions, and reflection coefficient also all drops to -75dB or so, can approximation regard that there is no reflections as.
Claims (8)
1. a kind of four port reflectionless filter of transmission line, it is characterised in that: including first port (1), second port (2),
Three ports (3), the 4th port (4), four quarter-wave termination open-circuit transfer minor matters lines (5), four quarter-waves
Terminal short circuit transmits minor matters line (6), four half wavelength transmission minor matters lines (7), four quarter-wave termination open circuits
Minor matters line (8), four quarter-wave termination short-circuited transmission line sections (9), phase inverter (10)；Described two half wavelength
Each quarter-wave termination short circuit transmission minor matters line (6) in parallel in two sides for transmitting minor matters line (7), in quarter-wave
Quarter-wave open-end of connecting respectively on the outside of long terminal short circuit transmission minor matters line (6) transmits minor matters line (5), structure
At the first band logical branch, the second band logical branch；The each parallel connection in two sides of the another two half wavelength transmission minor matters line (7)
One quarter-wave termination open-circuit transfer minor matters line (8), on the outside of quarter-wave termination open-circuit transfer minor matters line (8)
One quarter-wave shorted end transmission line section (9) of series connection respectively constitutes first band resistance branch, the second band resistance branch；
The first band logical branch, first band resistance branch, the second band logical branch, the second band resistance branch are sequentially connected end to end, and are formed
One closed loop configuration, phase inverter (10) are added in any point cascade on closed loop configuration loop main line；The first port (1),
Two-port netwerk (2), third port (3), the 4th port (4) respectively connect the common point of a closed loop configuration, and the two sides of each port are equal
A respectively band logical branch and a band resistance branch.
2. four port reflectionless filter of transmission line according to claim 1, it is characterised in that: four a quarters
The impedance value that wavelength open-end transmits minor matters line (5) is identical, and minor matters line (6) are transmitted in four quarter-wave termination short circuits
Impedance value is identical, and the impedance value of four halfs wavelength transmission minor matters line (7) is identical, four quarter-waves
The impedance value of open-end minor matters line (8) is identical, the impedance value of four quarter-wave termination short-circuited transmission lines section (9)
It is identical.
3. four port reflectionless filter of transmission line according to claim 1, it is characterised in that: the band logical branch and with resistance
The filtering characteristic of branch is complete complementary, centre frequency having the same.
4. four port reflectionless filter of transmission line according to claim 1, it is characterised in that: the quarter-wave is whole
Hold open-circuit transfer minor matters line (5), quarter-wave termination short circuit transmission minor matters line (6), quarter-wave termination open circuit branch
Nodel line (8), quarter-wave termination short-circuited transmission line section (9) electrical length in the four port reflectionless filter of transmission line
Centre frequency at be quarter-wave, the electrical length of the half wavelength transmission minor matters line (7) is in the transmission line
It is half wavelength at the centre frequency of four port reflectionless filters.
5. four port reflectionless filter of transmission line according to claim 1, it is characterised in that: the quarter-wave is whole
Hold open-circuit transfer minor matters line (5), the electrical length of quarter-wave termination open circuit minor matters line (8) includes to compensate terminal open circuit
Discontinuity effect caused by additional length, the quarter-wave termination short circuit transmits minor matters line (6), quarter-wave
The electrical length of long shorted end transmission line section (9) includes additional length caused by compensate the discontinuity effect of end short circuit
Degree.
6. four port reflectionless filter of transmission line according to claim 1, it is characterised in that: the first port (1),
Two-port netwerk (2), third port (3), the 4th port (4) can not only be used for output port, also can be used as input port.
7. four port reflectionless filter of transmission line according to claim 1, it is characterised in that: the band logical branch can be with
High-pass filtering is carried out, the band resistance branch can carry out low-pass filtering.
8. four port reflectionless filter of transmission line according to claim 1, it is characterised in that: the input port (1),
The impedance value of output port (2), output port (3) and output port (4) is 1 Ohm；The quarter-wave termination is opened
The impedance value of road transmission minor matters line (5) is 1.5693 Ohm, and the impedance of minor matters line (6) is transmitted in quarter-wave termination short circuit
Value is 0.6242 Ohm, and the impedance value of half wavelength transmission minor matters line (7) is 1.3899 Ohm, and quarter-wave is whole
The impedance value of end open circuit minor matters line (8) is 0.6242 Ohm, and the impedance value of quarter-wave termination short-circuited transmission line section (9) is
1.5693 Ohm。
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| CN113193316A (en) * | 2021-04-30 | 2021-07-30 | 南通大学 | Non-reflection band-pass filter based on double-sided parallel strip lines |
| CN113346861A (en) * | 2021-05-12 | 2021-09-03 | 南京邮电大学 | Bandwidth-adjustable reflection-free filter of full-open branch transmission line |
| 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 |
| CN113611999A (en) * | 2021-08-10 | 2021-11-05 | 大连海事大学 | Broadband microwave circuit with low insertion loss and flat negative group delay characteristics |
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| 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 |
| CN113346861B (en) * | 2021-05-12 | 2022-11-08 | 南京邮电大学 | Bandwidth-adjustable reflection-free filter of full-open branch transmission line |
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| CN113611999B (en) * | 2021-08-10 | 2022-07-08 | 大连海事大学 | Broadband microwave circuit with low insertion loss and flat negative group delay characteristics |
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| CN109742497B (en) | 2021-04-06 |
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