CN104009271B - A kind of plane bandpass filter based on cascade four resonators - Google Patents
A kind of plane bandpass filter based on cascade four resonators Download PDFInfo
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Abstract
The invention discloses a kind of plane bandpass filter based on cascade four resonators, comprise incoming feeder, output feeder, quarter-wave first resonator and the 4th resonator and four/three-wavelength second resonator and the 3rd resonator; First resonator, the second resonator, the 3rd resonator and the 4th resonator successively cascade form loop configuration; First resonator and the 4th resonator are corresponding with output feeder with incoming feeder parallel respectively, form the first coupled structure and the 5th coupled structure respectively; First resonator is connected the first grounding through hole with the second resonator, forms the second coupled structure; 3rd resonator one end is connected with the second grounding through hole with one end of the 4th resonator, forms the 4th coupled structure; There is coupling gap between second resonator and the 3rd resonator, form the 3rd coupled structure; There is coupling gap between first resonator and the 4th resonator port, form the 6th coupled structure.There is the advantage that frequency selectivity is high and in-band insertion loss is little.
Description
Technical field
The present invention relates to a kind of band pass filter, particularly a kind of plane bandpass filter based on cascade four resonators.
Background technology
RF/Microwave filter is the requisite parts of system such as modern microwave trunking traffic, satellite communication, radio communication and electronic countermeasures, is also the most important microwave passive component the highest with technology content simultaneously.Band pass filter is as one of part important in Circuits System, and the quality of its performance largely determines the work quality of system.Band pass filter operates mainly in communication system radio-frequency front-end, for low-loss by the useful signal in a certain frequency range, and the frequency component of other frequency ranges is decayed to pole low-level.
But, along with the high speed development of modern communications demand, available frequency spectrum resource growing tension is therefore more and more higher to the requirement of filter frequencies selectivity characteristic.In order to improve message capacity and avoid the interference between adjacent channel, require that filter must have precipitous Out-of-band rejection; In order to improve signal to noise ratio, require will there be low insertion loss in passband; And in order to reduce the distortion of signal, require in passband, have smooth amplitude-frequency characteristic and group delay property; In order to meet Modern communications terminals trend toward miniaturization, require that filter has less volume and weight.Traditional Butterworth and Chebyshev filter have been difficult to meet these requirements, and the filter introducing the cross coupling structure with definite transmission zero point is the most frequently used at present is also best selection.Compared with conventional filter, this filter can not only meet the high selectivity characteristic outside passband, can reduce the number of resonant cavity simultaneously, reduces design cost and filter volume.So far, had a lot of scholar to propose the microwave band-pass filter with cross coupling structure, wherein some shows good performance really: in-band insertion loss is less, selectivity is more high.But certain structures but have employed too high exponent number and makes filter volume excessive, is unfavorable for integrated.
Summary of the invention
The object of the invention is to overcome the shortcoming of prior art and deficiency, the plane bandpass filter based on cascade four resonators that a kind of frequency selectivity is higher, band internal loss is less and volume is little is provided.The present invention introduces controlled cross-couplings between resonator, makes passband produce multiple transmission zero outward, thus reaches and roll-off fast, improves optionally object.
Object of the present invention is achieved through the following technical solutions: a kind of plane bandpass filter based on cascade four resonators, comprises incoming feeder and output feeder; Described filter also comprises that structure is identical and quarter-wave first resonator of positional symmetry is identical with the 4th resonator and structure and four/three-wavelength second resonator of positional symmetry and the 3rd resonator; Described first resonator, the second resonator, the 3rd resonator and the 4th resonator successively cascade form a loop configuration;
Described first resonator is parallel with output feeder one_to_one corresponding with incoming feeder respectively with the 4th resonator; And there is gap between described first resonator and incoming feeder, form the first coupled structure;
Described first resonator one end is connected the first grounding through hole with one end of the second resonator, and described first grounding through hole is introduce magnetic coupling between the first resonator and the second resonator, forms the second coupled structure;
There is coupling gap between described second resonator and the 3rd resonator, form the 3rd coupled structure;
Described 3rd resonator one end is connected with the second grounding through hole with one end of the 4th resonator; Described second grounding through hole is introduce magnetic coupling between the 3rd resonator and the 4th resonator, forms the 4th coupled structure;
Described 4th exists gap between resonator and output feeder, forms the 5th coupled structure;
There is coupling gap between described first resonator and the 4th resonator port, form the 6th coupled structure.
Preferably, described first resonator and the 4th resonator are one article of microstrip line, microstrip line as the first resonator is connected with the first grounding through hole and the second grounding through hole respectively with one of them port of the microstrip line as the 4th resonator, article two, there is a gap between another port of microstrip line, form described 6th coupled structure; Wherein two microstrip lines are symmetrical arranged and are on same straight line.
Preferably, described second resonator and the 3rd resonator are by the first microstrip line be connected successively, the second microstrip line, the 3rd microstrip line, the 4th microstrip line, the 5th microstrip line and the 6th microstrip line composition, and the angle wherein between the above-mentioned microstrip line be connected to each other is 90 degree;
Described second resonator and the 3rd resonator by the first microstrip line respectively with the first grounding through hole with the second grounding through hole is corresponding is connected, there is a coupling gap between described second resonator and the 3rd resonator and that is there is coupling gap between the second resonator and the 3rd resonator the 5th microstrip line, constitute described 3rd coupled structure.
Further, angle between described first resonator and the first microstrip line of the second resonator is 90 degree, there is coupling gap between second microstrip line of described second resonator and the first resonator, form described second coupled structure together with the first grounding through hole;
Angle between described 4th resonator and the first microstrip line of the 3rd resonator is 90 degree, there is coupling gap between the second microstrip line of described 3rd resonator and the 4th resonator, forms described 4th coupled structure together with the second grounding through hole;
The width of the coupling gap between described second resonator and the first resonator and the coupling gap between the 3rd resonator and the 4th resonator is the length of the first microstrip line of the second resonator and the 3rd resonator.
Preferably, between described second resonator and the 3rd resonator, the original position of coupling gap is: from the second resonator and the 3rd resonator short-circuit end count at the second resonator and the 3rd resonator total length 2/3rds.
Preferably, described incoming feeder is connected with the 9th microstrip line by the 7th microstrip line be connected successively, the 8th microstrip line with output feeder; Described electromagnetic wave, from the 7th microstrip line feed-in of incoming feeder, feeds out from the 7th microstrip line of output feeder; Described 7th microstrip line, the 8th microstrip line and the 9th microstrip line connect into " 7 " type structure, form an obtuse angle between the 7th microstrip line and the 8th microstrip line, form an acute angle between the 8th microstrip line and the 9th microstrip line;
Wherein incoming feeder and output feeder are symmetrical arranged, and the 9th microstrip line of incoming feeder is parallel with the first resonator, and the 9th microstrip line of output feeder is parallel with the 4th resonator;
Preferably, there is a coupling gap between the port of incoming feeder the 9th microstrip line and the port of output feeder the 9th microstrip line, form described 7th coupled structure.
Preferably, the input port of described incoming feeder and the output port of output feeder are the matched impedance of 50 ohm.
Preferably, described plane bandpass filter is produced on the micro-belt substrate of double-sided copper-clad in the manner of a printed circuit board, and wherein the other one side of micro-belt substrate covers copper ground plate.
The present invention has following advantage and effect relative to prior art:
(1) flat filter of the present invention is become with two four/three-wavelength resonator stages joint groups by two quarter-wave resonance devices, has the little easily integrated advantage of volume.Incoming feeder and output feeder and form coupled structure respectively between the first resonator and the 4th resonator in addition, also coupled structure is formed respectively between resonator, by between adjustment resonator and resonator and the magnetic coupling between incoming feeder and output feeder and piezoelectric coupling strength, make the bandwidth of filter adjusted within the specific limits, thus the bandwidth of filter can be controlled easily.By introducing controlled cross-couplings between the first resonator and the 4th resonator in the present invention, thus make the passband both sides of filter of the present invention produce multiple transmission zero, greatly improve the Out-of-band rejection effect of filter, substantially increase the frequency selective characteristic of filter of the present invention, there is the advantage that in-band insertion loss is little simultaneously.
(2) flat filter of the present invention also by introducing cross-couplings between incoming feeder and output feeder, thus make the passband both sides of filter produce more many transmission zeros, refer to the frequency selective characteristic of filter of the present invention further.
(3) what flat filter of the present invention adopted is micro-band forms, therefore has flexible design, cost is low, volume is little and be convenient to integrated advantage.
Accompanying drawing explanation
Fig. 1 is the structural representation of plane bandpass filter of the present invention.
Fig. 2 is the insertion loss of plane bandpass filter of the present invention in 1.2GHz to 4.8GHz frequency range and return loss.
Fig. 3 is the insertion loss of plane bandpass filter of the present invention in 1GHz to 10GHz frequency range and return loss.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, present embodiment discloses a kind of plane bandpass filter based on cascade four resonators, wherein the plane bandpass filter of the present embodiment is produced on the micro-belt substrate 1 of double-sided copper-clad in the manner of a printed circuit board, the other one side of micro-belt substrate 1 covers copper ground plate, the relative dielectric constant of this micro-belt substrate is 2.55, and medium level is 0.80mm.
The present embodiment plane bandpass filter comprise the identical and incoming feeder 2 of positional symmetry of structure with output feeder 3, structure is identical and quarter-wave first resonator 4 of positional symmetry is identical with the 4th resonator 5 and structure and four/three-wavelength second resonator 6 of positional symmetry and the 3rd resonator 7; Wherein the first resonator 4, second resonator 6, the 3rd resonator 7 and the 4th resonator 5 successively cascade form a loop configuration;
In the present embodiment, incoming feeder 2 is connected with the 9th microstrip line by the 7th microstrip line be connected successively, the 8th microstrip line with output feeder 3; Described electromagnetic wave signal, from the port1 port feed-in of the 7th microstrip line of incoming feeder, feeds out the useful signal of the particular frequency range after filter is selected from the port2 port of the 7th microstrip line of output feeder 3; Described 7th microstrip line, the 8th microstrip line and the 9th microstrip line connect into " 7 " type structure, form an obtuse angle between the 7th microstrip line and the 8th microstrip line, form an acute angle between the 8th microstrip line and the 9th microstrip line.9th microstrip line of incoming feeder and output feeder is symmetrical arranged and is on same straight line.The wherein width W of the 9th microstrip line of incoming feeder 2 and output feeder 3
2=1.1mm.In three feeder lines of incoming feeder and output feeder, the width of the 7th microstrip line, the 8th microstrip line and the 9th microstrip line reduces successively.The input port 2 of incoming feeder and the output port of output feeder 3 are the matched impedance of 50 ohm.
In the present embodiment, the first resonator 4 is made up of microstrip line, and the 4th resonator 5 is made up of microstrip line, and wherein two microstrip lines are symmetrical arranged and are on same straight line.Article two, the length L of microstrip line
1=16.9mm.
In the present embodiment, the second resonator 6 and the 3rd resonator 7 are by the first microstrip line be connected successively, the second microstrip line, the 3rd microstrip line, the 4th microstrip line, the 5th microstrip line and the 6th microstrip line composition, and the angle wherein between the above-mentioned microstrip line be connected to each other is 90 degree; As shown in fig. 1, the second resonator 6 of forming of six articles of microstrip lines and the 3rd resonator 7 are similar to helical structure.Wherein the first microstrip line of two resonators is parallel to each other, and on the same line, the 3rd microstrip line is parallel to each other for the second microstrip line, and on the same line, the 5th microstrip line is parallel to each other for the 4th microstrip line, and the 6th microstrip line on the same line.Second microstrip line length L
2=4.9mm, the 3rd microstrip line length L
3=16.0mm, the 4th microstrip line length L
4=11.0mm, the 5th microstrip line length L
5=11.0mm, the 6th microstrip line length L
6=9.3mm.The width of above-mentioned each microstrip line is W
1=1.0mm.
9th microstrip line of the present embodiment incoming feeder 2 is parallel with the microstrip line of the first resonator 4, and there is gap 14 between the first resonator 4 and incoming feeder 2, forms the first coupled structure; The stiffness of coupling between the first resonance filter 4 and incoming feeder 2 can be adjusted by the size adjusting this gap 14.
The microstrip line of the present embodiment first resonator 4 and the first microstrip line of the second resonator 6 are connected with the first grounding through hole 8 respectively, and the angle between the first microstrip line of the microstrip line of the first resonator 4 and the second resonator 6 is 90 degree, magnetic coupling is introduced by the first grounding through hole 8, second microstrip line of other second resonator 6 is parallel with the microstrip line of the first resonator 4 and form a gap 10, the second coupled structure is formed by this gap 10 and the first grounding through hole 8, the present embodiment adjusts the stiffness of coupling between the first resonator 4 and the second resonator 6 by the size of the size or the first grounding through hole 8 that adjust this gap 10.
There is gap 11 between the present embodiment second resonator 6 and the 5th microstrip line of the 3rd resonator 7, form the 3rd coupled structure, regulating stiffness of coupling between the second resonator 6 and the 3rd resonator 7 by adjusting this gap 11.Wherein the original position in this gap 11 is: from the second resonator 6 and the 3rd resonator 7 short-circuit end count at the second resonator 6 and the 3rd resonator 7 total length 2/3rds.
First microstrip line of the present embodiment the 3rd resonator 7 is connected with equal second grounding through hole 9 of the microstrip line of the 4th resonator 5, magnetic coupling is introduced by the second grounding through hole 9, second microstrip line of other 3rd resonator is parallel with the microstrip line of the 4th resonator and form a gap 12, form the 4th coupled structure by this gap 12 and the second grounding through hole 9, the present embodiment adjusts the stiffness of coupling between the 3rd resonator and the 4th resonator by the size of the size or the second grounding through hole 9 that adjust this gap 12.
9th microstrip line of the present embodiment output feeder 3 is parallel with the microstrip line of the 4th resonator 5, and there is gap 15 between the microstrip line of the 4th resonator 5 and output feeder 3, forms the 5th coupled structure; The stiffness of coupling between the 4th resonance filter 5 and output feeder 3 can be adjusted by the size adjusting this gap 15.
The microstrip line of the present embodiment first resonator 4 microstrip line of one end and the 4th resonator 5 be connected with the first grounding through hole 8 gap 13, one, one end be connected with the second grounding through hole 9, form the 6th coupled structure, controlled cross-couplings is introduced between the first resonator 4 and the 4th resonator 5 by this coupled structure, in the present embodiment, this cross-couplings makes plane bandpass filter passband both sides produce 2 transmission zeros, additionally by the cross coupling strength that the size of adjusting play 13 can adjust between the first resonator 4 and the 4th resonator 5.
A gap is formed between the port of the 9th microstrip line of the present embodiment incoming feeder 2 and output feeder 3, form the 7th coupled structure, between the feeder line of source load end, cross-couplings is introduced by the 7th coupled structure, in the present embodiment, this cross-couplings makes plane bandpass filter passband both sides produce 4 transmission zeros, the cross coupling strength that the size additionally by this gap of adjustment can adjust between incoming feeder 2 and output feeder 3.
Wherein the scattering parameter simulation result of the present embodiment plane bandpass filter as shown in Figure 2, wherein frequency range is 1.2GHz to 4.8GHz, transverse axis represents the frequency input signal of the present embodiment band pass filter, the longitudinal axis represents log-magnitude (dB), comprises the amplitude of insertion loss S21 and the amplitude of return loss S11.Wherein S21 represents that its corresponding mathematical function is by the relation between the signal input power of the present embodiment band pass filter and output power signal:
10*lg(Pi/Po)(dB)＝20*lg|S21|；
Wherein Pi represents input power, and Po represents power output.
In the signals transmission of the present embodiment band pass filter, the Partial Power of signal is reflected back toward signal source, is become reflection power by the power reflected; Wherein S11 represents the relation between the input power of the signal of the present embodiment band pass filter and the reflection power of signal, and its corresponding mathematical function is:
10*lg(Pr/Pi)(dB)＝20*lg|S11|；
Wherein Pr represents reflection power, and Pi represents input power.
The present embodiment filter centre frequency is 3GHz, can draw according in the curve of return loss S11 in Fig. 2, four reflection zeros are clearly had in passband, wherein in-band insertion loss absolute value is less than 1.5dB, and return loss absolute value is greater than 20dB, and produces six transmission zeros in passband both sides, effectively increase the steepness of cut-off frequency, stopband is declined fast, band edge is more precipitous, substantially increases the frequency selective characteristic of filter.
As shown in Figure 3, when frequency range is 1GHz to 10GHz, the scattering parameter simulation result of the present embodiment plane bandpass filter, can draw by figure, the present embodiment plane bandpass filter can produce multiple transmission zero point in passband both sides ,-20dB Out-of-band rejection is to 8.92GHz from 3.22GHz, and the parasitic passband of two frequencys multiplication is inhibited, visible, Out-of-band rejection characteristic very good.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (9)
1., based on a plane bandpass filter for cascade four resonators, comprise incoming feeder and output feeder; It is characterized in that, described filter also comprises that structure is identical and quarter-wave first resonator of positional symmetry is identical with the 4th resonator and structure and four/three-wavelength second resonator of positional symmetry and the 3rd resonator; Described first resonator, the second resonator, the 3rd resonator and the 4th resonator successively cascade form a loop configuration;
Described first resonator is parallel with incoming feeder, and there is gap between described first resonator and incoming feeder, forms the first coupled structure;
Described first resonator one end is connected the first grounding through hole with one end of the second resonator, and described first grounding through hole is introduce magnetic coupling between the first resonator and the second resonator, forms the second coupled structure;
There is coupling gap between described second resonator and the 3rd resonator, form the 3rd coupled structure;
Described 3rd resonator one end is connected with the second grounding through hole with one end of the 4th resonator; Described second grounding through hole is introduce magnetic coupling between the 3rd resonator and the 4th resonator, forms the 4th coupled structure;
Described 4th resonator is parallel with output feeder, and the described 4th exists gap between resonator and output feeder, forms the 5th coupled structure;
There is coupling gap between described first resonator and the 4th resonator port, form the 6th coupled structure.
2. the plane bandpass filter based on cascade four resonators according to claim 1, it is characterized in that, described first resonator and the 4th resonator are one article of microstrip line, microstrip line as the first resonator is connected with the first grounding through hole and the second grounding through hole respectively with one of them port of the microstrip line as the 4th resonator, article two, there is a gap between another port of microstrip line, form described 6th coupled structure; Wherein two microstrip lines are symmetrical arranged and are on same straight line.
3. the plane bandpass filter based on cascade four resonators according to claim 1, it is characterized in that, described second resonator and the 3rd resonator are by the first microstrip line be connected successively, the second microstrip line, the 3rd microstrip line, the 4th microstrip line, the 5th microstrip line and the 6th microstrip line composition, and the angle wherein between the above-mentioned microstrip line be connected to each other is 90 degree;
Described second resonator and the 3rd resonator by the first microstrip line respectively with the first grounding through hole with the second grounding through hole is corresponding is connected, there is a coupling gap between described second resonator and the 3rd resonator and that is there is coupling gap between the second resonator and the 3rd resonator the 5th microstrip line, constitute described 3rd coupled structure.
4. the plane bandpass filter based on cascade four resonators according to claim 3, it is characterized in that, angle between described first resonator and the first microstrip line of the second resonator is 90 degree, there is coupling gap between second microstrip line of described second resonator and the first resonator, form described second coupled structure together with the first grounding through hole;
Angle between described 4th resonator and the first microstrip line of the 3rd resonator is 90 degree, there is coupling gap between the second microstrip line of described 3rd resonator and the 4th resonator, forms described 4th coupled structure together with the second grounding through hole;
The width of the coupling gap between described second resonator and the first resonator and the coupling gap between the 3rd resonator and the 4th resonator is the length of the first microstrip line of the second resonator and the 3rd resonator.
5. the plane bandpass filter based on cascade four resonators according to claim 1, it is characterized in that, between described second resonator and the 3rd resonator, the original position of coupling gap is: from the second resonator and the 3rd resonator short-circuit end count at the second resonator and the 3rd resonator total length 2/3rds.
6. the plane bandpass filter based on cascade four resonators according to claim 1, is characterized in that, described incoming feeder is connected with the 9th microstrip line by the 7th microstrip line be connected successively, the 8th microstrip line with output feeder; Electromagnetic wave, from the 7th microstrip line feed-in of incoming feeder, feeds out from the 7th microstrip line of output feeder; Described 7th microstrip line, the 8th microstrip line and the 9th microstrip line connect into " 7 " type structure, form an obtuse angle between the 7th microstrip line and the 8th microstrip line, form an acute angle between the 8th microstrip line and the 9th microstrip line;
Wherein incoming feeder and output feeder are symmetrical arranged, and the 9th microstrip line of incoming feeder is parallel with the first resonator, and the 9th microstrip line of output feeder is parallel with the 4th resonator.
7. the plane bandpass filter based on cascade four resonators according to claim 6, is characterized in that, there is a coupling gap between the port of incoming feeder the 9th microstrip line and the port of output feeder the 9th microstrip line, forms the 7th coupled structure.
8. the plane bandpass filter based on cascade four resonators according to claim 1, is characterized in that, the input port of described incoming feeder and the output port of output feeder are the matched impedance of 50 ohm.
9. the plane bandpass filter based on cascade four resonators according to claim 1, it is characterized in that, described plane bandpass filter is produced on the micro-belt substrate of double-sided copper-clad in the manner of a printed circuit board, and wherein the other one side of micro-belt substrate covers copper ground plate.
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| CN106602187A (en) * | 2017-01-09 | 2017-04-26 | 华南理工大学 | Planar band-pass filter with wide stop-band suppression |
| CN107181032A (en) * | 2017-05-27 | 2017-09-19 | 中国电子科技集团公司第四十研究所 | A kind of circuited microstrip loop hair clip bandpass filter |
| CN114552153B (en) * | 2022-03-29 | 2023-10-20 | 中国人民解放军国防科技大学 | W-band-pass filter based on rectangular micro-coaxial structure |
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| US7084720B2 (en) * | 2002-01-09 | 2006-08-01 | Broadcom Corporation | Printed bandpass filter for a double conversion tuner |
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| CN1747225A (en) * | 2005-09-16 | 2006-03-15 | 中国电子科技集团公司第五十五研究所 | Zero-point micromachinery and microwave filter with dual-tuning transmission |
| CN203871449U (en) * | 2014-05-12 | 2014-10-08 | 华南理工大学 | Planar band pass filter based on concatenation of four resonators |
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