CN108417938B - A kind of micro-strip model filters power splitter - Google Patents
A kind of micro-strip model filters power splitter Download PDFInfo
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- CN108417938B CN108417938B CN201810383351.3A CN201810383351A CN108417938B CN 108417938 B CN108417938 B CN 108417938B CN 201810383351 A CN201810383351 A CN 201810383351A CN 108417938 B CN108417938 B CN 108417938B
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- impedance
- power splitter
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- parallel coupling
- model filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
-
- 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
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20354—Non-comb or non-interdigital filters
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- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
In the communications field, traditional filter and power splitter are two different resolution elements.The present invention provides a kind of micro-strip model filters power splitter, while realizing the function of filtering and function point, so that effective must reduce component size.Studies have shown that the micro-strip model filters power splitter is while realizing bisection to input signal, additionally it is possible to realize three rank bandpass responses.Respectively there is a transmission zero in passband two sides, greatly improves frequency selectivity；With Out-of-band rejection ability outstanding；Isolation between output port is high；Size is smaller；In addition, design process is simple, it is easy the remarkable advantages such as debugging.
Description
Technical field
The invention belongs to fields of communication technology, and in particular to a kind of micro-strip model filters power splitter.
Background technique
In the higher frequency bands such as RF/Microwave/optical frequency, microstrip line, strip line, the line of rabbet joint, fin line, coplanar wave are mainly used
It leads, coaxial line, a variety of transmission line structures such as waveguide.These transmission lines have distribution parameter effect, electrical characteristic and structure ruler
It is very little to be closely related.Wherein, it is excellent to have that small in size, light-weight, service band is wide, high reliablity and manufacturing cost are low etc. for microstrip line
Point is widely used a kind of transmission line.In radar, communication and measuring system, filter is one of Primary Component.Its function
It is to allow that the signal of a certain component frequency smoothly to pass through, and allows the signal of another part frequency by biggish inhibition,
Its performance has important influence for whole system performance.The technical indicator of filter includes pass band width, insertion loss, leads to
Band fluctuation, return loss, belt resistance inhibitor system, with interior phase linearity and group delay etc..Power splitter full name power divider, is logical
Important devices in letter or radar system.It is it is a kind of will input signal energy be divided into two-way all the way or multiple-channel output is equal or not
The synthesis of multiple signals energy can also be exported all the way in turn, can be also referred to as combiner at this time by the device of equal energy.Due to function
Divide device can be inversely used as combiner, so following discussion is all by taking power splitter as an example.The output port of one power splitter
Between should ensure that certain isolation.The important technological parameters of power splitter have between insertion loss, return loss, power distribution port
Isolation and passband width etc..Traditional filter and power splitter is two discrete elements, undertakes different functions.Such as
Fruit can realize simultaneously the function of filtering and function point with an element, it will help reduce component size, which is referred to as filtering
Wave power splitter.If realized using microstrip line, referred to as micro-strip model filters power splitter.Exploring has small size, well filters function
The novel micro-strip model filters power splitter structure of energy has particularly important meaning
Summary of the invention
The purpose of the invention is to overcome traditional filter and power splitter adhere to separately two elements and it is larger-size lack
Point provides a kind of novel micro-strip model filters power splitter, can be achieved at the same time the function of filtering and function point, has outstanding frequency
The advantages that selectivity, small size and easy design.
The structure of model microstrip line is as shown in Figure 1, mainly include three layers.Tier I is metal overlying strata, and tier ii is medium
Substrate, layer III are coating under metal.The structure of micro-strip model filters power splitter of the present invention is as shown in Figure 2.In order to realize this
The invention micro-strip model filters power splitter, used technical solution is: etching is as schemed in the metal overlying strata (I) of microstrip line
Pattern shown in 2.It is characterized by: first port (1) is connected to the left end of parallel coupling three wire configuration (11)；Parallel coupling three
Two lines bridge first resistor (R1) in left end respectively outside cable architecture (11), bridge second resistance (R2) in right end；In parallel coupling
Three wire configuration (11) right end is closed, while being connected to First Line section (21), two cable architecture of the first parallel coupling (23), the second line section
(31) and two cable architecture of the second parallel coupling (33)；First Line section (21) is connected with third line section (22), the second line section (31) with
4th line section (32) is connected, and third line section (22) is connected by 3rd resistor (R3) with the 4th line section (32)；First parallel coupling
Two cable architectures (23) are connected to second port (2)；Second parallel coupling, two cable architecture (33) is connected to third port (3)；It constitutes
Micro-strip model filters power splitter of the present invention.
In micro-strip model filters power splitter as shown in Figure 2, electric parameter is as follows: the impedance of first port (1) is Z1；Second end
The impedance of mouth (2) is Z2；The impedance of third port (3) is Z3；Parallel coupling three wire configuration (11) as shown in figure 3, three lines line
Width is equal, and the gap between line and line is equal, if the even mode impedance of two cable architecture of parallel coupling in dotted line frame is Z11e, odd mould
Impedance is Z11o, electrical length θ11；(21) impedance of First Line section is Z21, electrical length θ21；Second line section (31) impedance is Z31, electricity
Length is θ31；Section (22) impedance of third line is Z22, electrical length θ22；4th line section (32) impedance is Z32, electrical length θ32；The
The even mode impedance of one parallel coupling, two cable architecture (23) is Z23e, odd mode impedance Z23o, electrical length θ23；Second parallel coupling two
The even mode impedance of cable architecture (33) is Z33e, odd mode impedance Z33o, electrical length θ33。
Without loss of generality, input signal is realized with micro-strip model filters power splitter of the present invention and is halved, and there is band
Pass filter function.Therefore, the structure of micro-strip model filters power splitter is symmetrical above and below.It can be using analysis method of odd-even model to micro-strip
Model filters power splitter is analyzed, and even mode structure and odd mode structure are respectively obtained.Wherein, even mode structure can use the lump in Fig. 4
Parameter equivalent circuit describes.Wherein, VSIt is signal source, RSIt is singal source resistance, RLIt is load impedance, K1And K2It is that impedance is inverted
Device, L1、L2、L3And L4It is inductance, C1、C2、C3And C4It is capacitor.The electric parameter of micro-strip model filters power splitter and lumped parameter are equivalent
Between the element of circuit, described by following equivalent relation formula:
Wherein, ω0It is the center angular frequency of bandpass response, i.e. ω0=2 π f0, f0The center frequency of bandpass response
Rate.Electrical length θ11、θ21、θ22And θ23It is equal to pi/2 at centre frequency.
The design procedure of micro-strip model filters power splitter of the present invention is as follows: the first step, according to micro-strip model filters power splitter institute
The technical indicator to be realized, including passband position, with interior return loss, transmission zero location etc., first determine Fig. 4 in collection Headquarters of the General Staff
Each component value of number equivalent circuit；Second step arrives (6) using equivalent relation formula (1), by each of lumped parameter equivalent circuit
The electric parameter of micro-strip model filters power splitter is calculated in a component value；Third step, after selecting microstrip substrate, according to electric parameter meter
Calculation obtains the structural parameters of micro-strip model filters power splitter, then by optimizing and revising structural parameters, keeps micro-strip model filters power splitter performance full
The requirement of sufficient technical indicator.
The beneficial effect of micro-strip model filters power splitter of the present invention is: respectively having a transmission zero, pole on passband both sides
Frequency selectivity is improved greatly；Isolation between output port is high；Size is smaller, and design process is simple, and it is aobvious to be easy debugging etc.
Write advantage.
Detailed description of the invention
Fig. 1: microstrip line construction schematic diagram；
Fig. 2: micro-strip model filters power splitter schematic diagram；
Fig. 3: parallel coupling three wire configuration schematic diagram；
Fig. 4: the lumped parameter equivalent circuit figure of micro-strip model filters power splitter idol mode structure；
Fig. 5: the ideal bandpass response figure of embodiment；
Fig. 6: micro-strip model filters power splitter size marking schematic diagram；
Fig. 7: embodiment | S11| with | S21| simulation result and test result figure；
Fig. 8: embodiment | S22| with | S32| simulation result and test result figure.
Specific embodiment
In order to embody creativeness and novelty of the invention, the physical machine of the micro-strip model filters power splitter is analysed in depth below
System.In the analysis process, it will be illustrated with reference to the drawings and specific embodiments, embodiments of the present invention are not limited thereto.?
In embodiment, input signal is realized with the micro-strip model filters power splitter and is halved, and there is band-pass filtering function.Band logical frequency is rung
The centre frequency answered is 1.94GHz, and relative bandwidth 39% is greater than 20dB with interior return loss.Ideal bandpass response
As shown in figure 5, respectively having a transmission zero in passband two sides, frequency selectivity must can be effectively promoted.In addition, by three ports
Impedance setting be 50 Ω, i.e. Z1=Z2=Z3=50 Ω.
According to the design procedure of foregoing micro-strip model filters power splitter, the first step is determined in Fig. 5 according to technical indicator
Lumped parameter equivalent circuit each component value.In the present embodiment, it is obtained according to technical indicator: K1=K2=45.8258
Ω、L1=L4=6.5042nH, C1=C4=1.0358pF, L2=1.7497nH, C2=3.8503pF, L3=1.4923nH and C3
=4.5143pF.
Second step arrives (6) using equivalent relation formula (1), is calculated by each component value of lumped parameter equivalent circuit
To the electric parameter of micro-strip model filters power splitter.By can be calculated: Z11e=146.7220 Ω, Z11o=55.0705 Ω, Z21=
41.4221 Ω, Z22=78.7306 Ω, Z23e=146.7220 Ω, Z23o=55.0705 Ω.Electrical length θ11、θ21、θ22And θ23?
It is equal to pi/2 at centre frequency.
Third step selectes microstrip substrate, obtains the structural parameters of micro-strip model filters power splitter according to electrical parameter calculation, then lead to
It crosses and optimizes and revises structural parameters, micro-strip model filters power splitter performance is made to meet the requirement of technical indicator.Without loss of generality, it uses here
The dielectric constant of microstrip line substrate is 3.66, substrate thickness 0.508mm.By electric parameter obtained above, available one
Group values of the structural parameters.After optimization, obtain as each structural parameters (unit: mm) in Fig. 6 are as follows: W1=0.34, W11
=0.35, l1=21.69, W2=0.18, l21=2.82, l22=21.00, W3=2.28, l31=2.60, l32=6.00, l33=
9.62 W4=0.36, l41=2.30, l42=12.66, l43=11.00, g1=0.24 and g2=0.24.Resistance are as follows: R1=270
Ω, R2=360 Ω and R3=6.2K Ω.
Processing test has been carried out to the micro-strip model filters power splitter in embodiment.In figures 7 and 8, provide Shi Lizhong's respectively
The simulation result and test result of micro-strip model filters power splitter.Two groups of results are coincide very well, have absolutely proved of the present invention set
The validity of meter process.From test result as it can be seen that the passband of the micro-strip model filters power splitter of actual processing being capable of soverlay technique index
It is required that frequency range.Insertion Loss at centre frequency is 3.74dB, effective bisection for realizing input power.Two biographies
Defeated zero point is located at passband two sides, i.e. so very big that improve frequency selectivity at 1.29GHz and 2.76GHz.From direct current to
It is suppressed over 34dB in 1.35GHz frequency range, from passband right side until being suppressed in 5.38GHz frequency range
28dB.In from direct current to 5.38GHz frequency range, the isolation between second port and third port is more than 20dB.It is entire micro-
Size with model filters power splitter is 0.33 λg×0.25λg, wherein λgIt is waveguide wavelength corresponding to centre frequency, illustrates that micro-strip is filtered
Wave power splitter has the advantages that small size.
Embodiment enumerated above has absolutely proved that micro-strip model filters power splitter of the present invention has excellent frequency
Response, the advantages that size is smaller, design process is simple have significant technological progress.Those skilled in the art will
, it is realized that the embodiments described herein, which is to help reader, understands the principle of the present invention, it should be understood that protection of the invention
Range is not limited to such specific embodiments and embodiments.Those skilled in the art can be disclosed according to the present invention
The technical disclosures make various various other specific variations and combinations for not departing from essence of the invention, and these variations and combinations are still
So within the scope of the present invention.
Claims (3)
1. a kind of micro-strip model filters power splitter, it is characterised in that: first port (1) is connected to a left side for parallel coupling three wire configuration (11)
End；Two lines bridge first resistor (R1) in left end respectively outside parallel coupling three wire configuration (11), bridge second resistance in right end
(R2)；In parallel coupling three wire configuration (11) right end, while being connected to First Line section (21), two cable architecture of the first parallel coupling
(23), the second line section (31) and two cable architecture of the second parallel coupling (33)；First Line section (21) is connected with third line section (22), the
Two wires section (31) is connected with the 4th line section (32), and third line section (22) is connected by 3rd resistor (R3) with the 4th line section (32)；
First parallel coupling, two cable architecture (23) is connected to second port (2)；Second parallel coupling, two cable architecture (33) is connected to third
Port (3)；Constitute the micro-strip model filters power splitter.
2. a three rank bandpass responses may be implemented, in its passband in micro-strip model filters power splitter according to claim 1
Respectively there are a transmission zero in two sides.
3. micro-strip model filters power splitter according to claim 1, even mode structure can use a lumped parameter equivalent circuit
Come equivalent；Wherein, VSIt is signal source, RSIt is singal source resistance, RLIt is load impedance, K1And K2It is impedance inverter, L1、L2、L3With
L4It is inductance, C1、C2、C3And C4It is capacitor；The element of the electric parameter of micro-strip model filters power splitter and lumped parameter equivalent circuit it
Between, it is described by following equivalent relation formula:
Wherein, ω0It is the center angular frequency of bandpass response, i.e. ω0=2 π f0, f0The centre frequency of bandpass response；Electricity
Length θ11、θ21、θ22And θ23It is equal to pi/2 at centre frequency；In micro-strip model filters power splitter, electric parameter is as follows: first port
(1) impedance is Z1；The impedance of second port (2) is Z2；The impedance of third port (3) is Z3；Parallel coupling three wire configuration (11)
In two cable architecture of parallel coupling even mode impedance be Z11e, odd mode impedance Z11o, electrical length θ11；First Line section (21) impedance
For Z21, electrical length θ21；Second line section (31) impedance is Z31, electrical length θ31；Section (22) impedance of third line is Z22, electrical length
For θ22；4th line section (32) impedance is Z32, electrical length θ32；The even mode impedance of first parallel coupling, two cable architecture (23) is
Z23e, odd mode impedance Z23o, electrical length θ23；The even mode impedance of second parallel coupling, two cable architecture (33) is Z33e, odd mode impedance
For Z33o, electrical length θ33。
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109273807B (en) * | 2018-09-13 | 2020-07-07 | 南京师范大学 | Novel high-performance broadband four-power-division filter |
| CN110112526B (en) * | 2019-03-29 | 2022-01-11 | 电子科技大学 | Microstrip power divider with dual-passband frequency response |
| CN110350874B (en) * | 2019-07-09 | 2023-03-21 | 电子科技大学 | Microstrip power amplifier with harmonic suppression capability |
| CN110247147B (en) * | 2019-07-09 | 2021-06-08 | 电子科技大学 | Microstrip band-pass power divider |
| CN111224207B (en) * | 2020-01-13 | 2021-08-10 | 电子科技大学 | Broadband power divider |
| CN111224206B (en) * | 2020-01-13 | 2021-08-10 | 电子科技大学 | Microstrip power divider with ultra-wide stop band |
| CN111384535B (en) * | 2020-02-28 | 2021-04-30 | 南京智能高端装备产业研究院有限公司 | Double-passband power division filter |
| CN111416182B (en) * | 2020-03-19 | 2021-07-30 | 南京智能高端装备产业研究院有限公司 | High-selectivity three-passband power division filter |
| CN112332053B (en) * | 2020-09-24 | 2022-04-05 | 电子科技大学 | Wide-stopband filtering power divider |
| CN113036385B (en) * | 2021-03-01 | 2021-11-23 | 南京微毫科技有限公司 | Three-path filtering power divider with high selectivity |
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| CN106848505A (en) * | 2017-01-11 | 2017-06-13 | 电子科技大学 | Microstrip filter method for designing based on hybrid coupled |
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| CN107910629A (en) * | 2017-11-02 | 2018-04-13 | 东南大学 | A kind of low phase noise substrate integration wave-guide oscillator |
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| CN106935948A (en) * | 2017-02-10 | 2017-07-07 | 深圳大学 | A kind of work(filter-divider |
| CN106972233A (en) * | 2017-05-10 | 2017-07-21 | 厦门大学 | A kind of four tunnel filtering type power splitters based on three line coupled structures |
| CN107275740A (en) * | 2017-05-31 | 2017-10-20 | 南京邮电大学 | It is a kind of that there is the dual-frequency power divider for transmitting null character |
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|---|---|---|---|---|
| CN106848505A (en) * | 2017-01-11 | 2017-06-13 | 电子科技大学 | Microstrip filter method for designing based on hybrid coupled |
| CN107302344A (en) * | 2017-05-18 | 2017-10-27 | 南京理工大学 | Dual-pushing type oscillator based on differential bandpass filter |
| CN107910629A (en) * | 2017-11-02 | 2018-04-13 | 东南大学 | A kind of low phase noise substrate integration wave-guide oscillator |
| CN107895829A (en) * | 2017-12-07 | 2018-04-10 | 电子科技大学 | A kind of microstrip filter with the accurate oval bandpass response of three ranks |
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