CN103618123A - Quantitative tuning method of microstrip filter - Google Patents
Quantitative tuning method of microstrip filter Download PDFInfo
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- CN103618123A CN103618123A CN201310492364.1A CN201310492364A CN103618123A CN 103618123 A CN103618123 A CN 103618123A CN 201310492364 A CN201310492364 A CN 201310492364A CN 103618123 A CN103618123 A CN 103618123A
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Abstract
The invention provides a quantitative tuning method of a microstrip filter. With application of the invention, pass band frequency deviation of a high-frequency microstrip filter can be adjusted, so that the problem that the high-frequency microstrip filter is lack of an effective tuning mode is solved. The invention can be realized through the following technical scheme: a series of conductor bands as a microstrip resonance unit is processed on a dielectric substrate, so as to form a parallel coupled band pass microstrip filter; one or more conductor islands are processed on each microstrip resonance unit, and the conductor island is completely cut off from other conductor of the microstrip resonance unit; and then the one or more conductor islands, through a section of the conductor, is communicated with other conductors of the microstrip resonance unit, so that the resonance frequency of the microstrip resonance unit which is communicated by the conductor is changed. The entire filter pass band is changed and the gap with the conductors around the microstrip resonance unit is adjusted, so that the movement of the filter pass band frequency is not stepped; and the filter pass band frequency is moved to the required value.
Description
Technical field
The invention relates to a kind of tuning microstrip filter and tuning methods thereof of quantizing.
Background technology
Microwave filter, as a critical component in microwave circuit and system, has the effect of selecting useful frequency, suppressing interference signal and noise.From transmission line, divide, microwave filter can be divided into waveguide filter, coaxial filter and microstrip filter etc. in form.Microstrip filter, as a kind of common microwave filter, has a wide range of applications in microwave circuit and system.Than cavity and coaxial filter, microstrip filter has volume little, easy to process, be easy to the advantages such as Planar integration, so be widely used in microwave integrated circuit.The microstrip filter of low-frequency range is low to requirement on machining accuracy, and simulation result and measured result are substantially identical, and the microstrip filter of the high bands such as Ku frequency range, K frequency range, Ka frequency range and W frequency range exists very large problem.As everyone knows, the band connection frequency of microstrip filter is decided by the resonance frequency of micro-band resonance unit wherein.Solve the band bending problem of microstrip filter, reasonable method is to resonant element, to carry out tuning after machining, change the resonance frequency of resonant element, thereby change the band connection frequency of microstrip filter, but the micro-band resonance unit of the high bands such as current Ku frequency range, K frequency range, Ka frequency range and W frequency range there is no more accurate tuning means.High frequency microstrip filter is due to the impact of the factors such as mismachining tolerance, the fluctuation of substrate media dielectric constant, substrate media varied in thickness, band connection frequency when the microstrip filter centre frequency processing and design and simulation there will be relatively large deviation, the skew of band connection frequency can cause filter passband insertion loss large, the inhibition degree of stopband is not up to standard, greatly affects the use of filter.The problem that occurs skew for solving the microstrip filter band connection frequency processing, usual way has two:
1. in design process, consider in advance the skew of band connection frequency, make the microstrip filter bandwidth of design be wider than the bandwidth of actual requirement, even if skew appears in the microstrip filter centre frequency processing like this, also can guarantee the frequency band of the passband energy coverage requirement of filter.The weak point of this method is, needs system to reduce the stopband of microstrip filter is suppressed to requirement, thereby the overall performance of system is declined.
2. design a plurality of microstrip filters with close band connection frequency, the bandwidth of each filter is identical, but covers different passbands, the actual microstrip filter processing is tested, and selects the microstrip filter that meets system instructions for use.The filter that this method is designed can meet the demand of system, but can increase exponentially design work and the processing cost of microstrip filter.
Summary of the invention
The present invention seeks to the problem for the frequency shift (FS) of prior art high frequency microstrip filter, proposing a kind of frequency offset can design in advance and quantize, and can effectively solve microstrip filter carrier deviation problem, microstrip filter form and the tuning methods thereof that can after machining, to the resonance frequency of microstrip filter, adjust.
The object of the invention can reach by following measures: the quantifiable tuning methods of a kind of microstrip filter, it is characterized in that having following technical characterictic, on medium substrate, process a series of conductor tapes as micro-band resonance unit, form the logical microstrip filter of a parallel coupling band, then on above-mentioned each micro-band resonance unit, process one or more conductor isolated islands, and all the other conductors of conductor isolated island and described micro-band resonance unit disconnect completely, then one or more conductor isolated islands are passed through to remaining conductor conducting on one section of conductor and micro-band resonance unit, make to be changed by the resonance frequency of the micro-band resonance unit of conductor conducting, by the conductor isolated island on one or more micro-band resonance units on above-mentioned filter, do above-mentioned similar operations, change the passband of whole filter and to above-mentioned each micro-band resonance unit upper conductor isolated island quantity, size, shape and with the adjustment of peripheral conductor pore size, conduction mode in conjunction with processing conductor isolated island and all the other conductors of resonator, can realize the movement of the different steppings of filter passband frequency, make the band connection frequency of filter move to the value needing.
The present invention has following beneficial effect than prior art.
Structure of the present invention and tuning methods are all fairly simple, and tuning amount can design in advance.Utilize the present invention, can be to high frequency microstrip filter because the band connection frequency deviation that the reasons such as mismachining tolerance, the fluctuation of medium dielectric constant cause is adjusted, thereby solve the problem that high frequency microstrip filter lacks effective tuning manner, make the filter of design can meet instructions for use after tuning.
Utilize the present invention can realize the movement of filter passband frequency, can meet the demand of different system so that same filter is realized different band connection frequencies by tuning, be conducive to the generalization of design of filter.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention can quantize tuning microstrip filter.
Fig. 2 is conductor isolated island conduction mode schematic diagram in Fig. 1.
In figure: 1 medium substrate, 2 conductor tapes, 3 conductor isolated islands, 4 microstrip lines, 5 bonding conductor isolated islands and all the other conductor parts of micro-band resonance unit conductor
Embodiment
Below in conjunction with accompanying drawing and example, the invention will be further described.
Consult Fig. 1.On a medium substrate 1, process a series of conductor tapes 2 and form a microstrip filter, wherein medium substrate can be arbitrary medium, and conventional medium is as pottery, polytetrafluoroethylene etc., and conductor can be also any conductor, conventional as copper, gold etc.Micro-band resonance unit can be various ways.The shape of isolated island can be circle, triangle, polygon etc.Tuning method is also not limited to, with gold wire bonding, can use conducting resinl, as long as metal isolated island and micro-band resonance unit remainder can be coupled together.Can on each resonant element of above-mentioned microstrip filter, process one or more conductor isolated islands 3, and all the other conductors of conductor isolated island and micro-band resonance unit disconnect completely; Then one or more conductor isolated island 3 is passed through to remaining conductor conducting on one section of conductor and micro-band resonance unit, any one or both sides of the conductor isolated island on some micro-band resonances wherein is simple eye, all the other conductor conductings with micro-band resonance unit, the resonance frequency of this micro-band resonance unit is changed, again the conductor isolated island on one or more micro-band resonance units on filter is done to above-mentioned similar operations, the passband of whole filter is changed; By to above-mentioned each micro-band resonance unit upper conductor isolated island quantity, size, shape and with the adjustment of peripheral conductor pore size, conduction mode in conjunction with processing conductor isolated island and all the other conductors of resonator, can realize the movement of the different steppings of filter passband frequency, to guarantee the making band connection frequency of filter move to the value needing under the condition of different mismachining tolerances.Method can be processed several conductor isolated islands 3 on medium substrate 1 three of centres or above conductor tape 2 according to the abovementioned embodiments of the present invention.Conductor isolated island 3 is not connected with conductor tape 2 remaining conductor part, and the shape of conductor isolated island can have any shape, and conductor isolated island best mode is cuboid.
Gap between remaining conductor part of conductor isolated island 3 and resonant element also can be arbitrary shape, but the two all can impact tuning frequency offset, need in emulation, design.In the middle of medium substrate 1, three conductor tapes 2 are micro-band resonance unit.It is 50 ohm microstrip 4 that medium substrate 1 both sides are provided with two conductor tapes, for the signal of input is fed into micro-band resonance unit, and the signal of exporting from micro-band resonance unit is outputed to external interface.Coupled microstrip line, the microstrip line that is equipped with the parallel conduction band of two or more pieces and is coupled mutually on same dielectric substrate.Article two, the coupled microstrip line of parallel conductor tape (conduction band) can encourage two kinds of independently patterns.A pair of coupling line is the anti-phase voltage of termination constant amplitude respectively, is called strange mould excitation, now on any cross section the voltage of two conduction bands all constant amplitude is anti-phase, the ripple transmitting is called strange mould.Coupling line is the voltage of termination constant amplitude homophase respectively, claims even mould excitation, now, the voltage of two conduction bands constant amplitude homophase all on any cross section, the ripple transmitting is called even mould.Very, the field distribution of even mould is different, its parameter is also different.Note coupling microstrip capacitance per unit length amount strange, even mould is C
0(ε
r) and C
θ(ε
r), when replacing substrate with air, its value is C
0and C (1)
θ(1), and strange, the even mould effective dielectric constant of coupling microstrip be ε
eff, 0=C
0(ε
r)/C
0(1), ε
eff, θ=C
θ(ε
r)/C
0(1), the phase velocity of strange mould and even mould is that the characteristic impedance of Qi Mo and even mould is Z
0, o=1/v
p,oc
0(ε
r) Z
0, θ=1/v
p, θc
θ(ε
r) Electric Field Distribution is less than even mould excitation at medium and airborne ratio during due to strange mould excitation, makes ε
eff, 0< ε
eff, θ, so v
p,o> v
p, θ, Z
0, o< Z
0, θtwo conduction bands are at a distance of nearer, and coupling characteristic impedance stronger, strange, even mould differs also larger, and vice versa.Except symmetrical parallel coupling line, also have the structures such as asymmetric parallel coupling and the coupling of many conduction bands.Along with the raising of frequency, also must consider to mix the dispersion characteristics of mould and the impact of higher mode.Simultaneously the microstrip filter in Fig. 1 is the logical microstrip filter of a kind of parallel coupling band, and the various microstrip filters of all the other kinds all can become and can quantize tuning microstrip filter by process conductor isolated island on its resonant element.
Consult Fig. 2.Manufactured, quantize on tuning microstrip filter, one or more conductor isolated island 3 is passed through to remaining conductor conducting on one section of conductor and micro-band resonance unit, can realize the movement of micro-band resonance unit resonance frequency, on a plurality of micro-band resonance units, carry out similar operations simultaneously, can realize the movement of filter passband frequency; The conductor isolated island 3 connecting and the conductor kind of resonant element can be for multiple, common as spun gold, conducting resinl etc., as long as conduction, the position of connection can be designed, and can connect a place or many places, need to design.
The isoparametric design of quantity, size, shape of conductor isolated island in Fig. 1 is combined with the design of conduction mode in Fig. 2, just can realize filter passband frequency and move with the frequency offset of different steppings, reach tuning object.Input signal from a microstrip line, signal is coupled on resonant element by microstrip line, and each resonant element has a resonance peak, and these resonance peaks intercouple and have just formed the passband of parallel coupling band pass filter.
Above-described is only the preferred embodiments of the present invention.It should be pointed out that for the person of ordinary skill of the art, under the premise without departing from the principles of the invention, can also make some distortion and improvement, these changes and change should be considered as belonging to protection scope of the present invention.
Claims (10)
1. the quantifiable tuning methods of microstrip filter, is characterized in that having following technical characterictic: on medium substrate, process a series of conductor tapes as micro-band resonance unit, form the logical microstrip filter of a parallel coupling band, then on above-mentioned each micro-band resonance unit, process one or more conductor isolated islands, and all the other conductors of conductor isolated island and described micro-band resonance unit disconnect completely, then one or more conductor isolated islands are passed through to remaining conductor conducting on one section of conductor and micro-band resonance unit, make to be changed by the resonance frequency of the micro-band resonance unit of conductor conducting, by the conductor isolated island on one or more micro-band resonance units on above-mentioned filter, do above-mentioned similar operations, change the passband of whole filter and to above-mentioned each micro-band resonance unit upper conductor isolated island quantity, size, shape and with the adjustment of peripheral conductor pore size, conduction mode in conjunction with processing conductor isolated island and all the other conductors of resonator, can realize the movement of the different steppings of filter passband frequency, make the band connection frequency of filter move to the value needing.
2. the quantifiable tuning methods of microstrip filter as claimed in claim 1, is characterized in that: medium substrate is arbitrary medium.
3. the quantifiable tuning methods of microstrip filter as claimed in claim 1, is characterized in that: the shape arbitrary shape of conductor isolated island.
4. the quantifiable tuning methods of microstrip filter as claimed in claim 1, it is characterized in that: three or the upper processing of above conductor tape (2) several conductor isolated islands (3) in the middle of medium substrate (1), conductor isolated island (3) is not connected with remaining conductor part of conductor tape (2).
5. the quantifiable tuning methods of microstrip filter as claimed in claim 1, it is characterized in that: it is 50 ohm microstrip (4) that medium substrate (1) both sides are provided with two conductor tapes, for the signal of input is fed into micro-band resonance unit, and the signal of exporting is outputed to external interface from micro-band resonance unit.
6. the quantifiable tuning methods of microstrip filter as claimed in claim 1, is characterized in that: conductor isolated island is shaped as cuboid.
7. the quantifiable tuning methods of microstrip filter as claimed in claim 1, is characterized in that: conductor tape is cuboid.
8. the quantifiable tuning methods of microstrip filter as claimed in claim 1, it is characterized in that: the coupled microstrip line of two parallel conductor tapes encourages two kinds of independently patterns, a pair of coupling line is the anti-phase voltage of termination constant amplitude respectively, be called strange mould excitation, now on any cross section the voltage of two conductor tapes all constant amplitude is anti-phase, the ripple transmitting is called strange mould.
9. the quantifiable tuning methods of microstrip filter as claimed in claim 8, it is characterized in that: coupling line is the voltage of termination constant amplitude homophase respectively, claim even mould excitation, now, the voltage of two conductor tapes constant amplitude homophase all on any cross section, the ripple transmitting is called even mould.
10. the quantifiable tuning methods of microstrip filter as claimed in claim 8, it is characterized in that: input signal from a microstrip line, this signal is coupled on resonant element by microstrip line, each resonant element has a resonance peak, and these resonance peaks intercouple and formed the passband of parallel coupling band pass filter.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108899624A (en) * | 2018-06-08 | 2018-11-27 | 西安空间无线电技术研究所 | A kind of tunable amplitude equalizer based on novel topological structure |
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| CN102629703A (en) * | 2012-05-08 | 2012-08-08 | 重庆大学 | Microstrip low-pass filter in defect microstrip line structure |
| CN202523823U (en) * | 2012-03-23 | 2012-11-07 | 浙江纺织服装职业技术学院 | Dual-mode intelligent tuned filter |
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| CN1700511A (en) * | 2004-05-19 | 2005-11-23 | 富士通株式会社 | Superconducting filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108899624A (en) * | 2018-06-08 | 2018-11-27 | 西安空间无线电技术研究所 | A kind of tunable amplitude equalizer based on novel topological structure |
| CN108899624B (en) * | 2018-06-08 | 2021-02-09 | 西安空间无线电技术研究所 | Tunable amplitude equalizer based on novel topological structure |
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| CN103618123B (en) | 2015-09-30 |
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