CN104393379A - Dual-frequency bandwidth band elimination filter based on loading structure of multi-step impendence resonators - Google Patents
Dual-frequency bandwidth band elimination filter based on loading structure of multi-step impendence resonators Download PDFInfo
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- CN104393379A CN104393379A CN201410647728.3A CN201410647728A CN104393379A CN 104393379 A CN104393379 A CN 104393379A CN 201410647728 A CN201410647728 A CN 201410647728A CN 104393379 A CN104393379 A CN 104393379A
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Abstract
The invention discloses a dual-frequency bandwidth band elimination filter based on a loading structure of a multi-step impendence resonator. The dual-frequency bandwidth band elimination filter comprises a first step impendence resonator, a second step impendence resonator, a third step impendence resonator, a first transmission line, a second transmission line, a first input/output port I/O, a second input/output port I/O; one end of the first transmission line is connected with the first input/output port I/O and the other end is connected with one end of the second transmission line; the other end of the second transmission line is connected with the second input/output port I/O; the first step impendence resonator is respectively connected with the first input/output port I/O and one end of the first transmission line; the second step impendence resonator is respectively connected with the other end of the first transmission line and one end of the second transmission line; and the third step impendence resonator is respectively connected with the other end of the second transmission line and the second input/output port I/O. According to the dual-frequency bandwidth band elimination filter, the impendence band with the width of two broad bands can be obtained and the impendence band has excellent edge selectivity.
Description
Technical field
The present invention relates to the technical field of high frequency assembly, refer in particular to a kind of double-frequency broadband band stop filter based on many step impedance resonator loading structure.
Background technology
Due to wireless communication technology develop rapidly and people to radio communication need day by day increase, current market 2G, 3G, 4G network is also deposited, many wireless terminals, such as mobile phone, panel computer etc., all wishing when designing can compatible multiple communication standard, this service that terminal use just can be allowed simultaneously to enjoy different operators provide.Multiband filter realizes multiple passband or stopband on a circuit simultaneously, can significantly reduce circuit size and reduce costs, and is therefore the focus of a research.
Flourish along with wireless messages industry in recent years, microwave spectrum resource is more and more deficienter, the division of frequency band is more and more meticulousr, utilance is more and more higher, in order to adapt to rational spectrum application and improve the performance of wireless communication system, band stop filter becomes one of part important in Circuits System, and the quality of its performance also largely determines the work quality of system.Band stop filter refers to and decays to extremely low-level filter by most of frequency component but by the frequency component of some scope, relative with the concept of band pass filter.Band stop filter is widely used in wireless communication system, is used for suppressing the spuious output of high power transmitter and the parasitic passband etc. of nonlinear power amplifier or band pass filter generation.
Spread bandwidth is for lifting communication speed important in inhibiting.Due to the development of broadband connections, wireless communication industry gets more and more to the demand of broadband device.But, but seldom there is now the design of the Broadband bandstop filter about double frequency.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of double-frequency broadband band stop filter based on many step impedance resonator loading structure is provided, by using three step impedance resonator, the stopband of two wide bandwidths can be obtained, and stopband has excellent skirt selectivity, greatly can improve filter effect.
For achieving the above object, technical scheme provided by the present invention is: based on the double-frequency broadband band stop filter of many step impedance resonator loading structure, include the first step impedance resonator, second step impedance resonator, 3rd step impedance resonator, first transmission line, second transmission line, first input/output port I/O, second input/output port I/O, wherein, one end of described first transmission line is connected with the first input/output port I/O, its other end is connected with one end of the second transmission line, the other end of described second transmission line is connected with the second input/output port I/O, signal is from one of them input/output port I/O feed-in, export from another input/output port I/O, described first step impedance resonator, the second step impedance resonator, the 3rd step impedance resonator interval are side by side, described first step impedance resonator is connected with one end of the first input/output port I/O and the first transmission line respectively, described second step impedance resonator is connected with the other end of the first transmission line and one end of the second transmission line respectively, and described 3rd step impedance resonator is connected with the other end of the second transmission line and the second input/output port I/O respectively, the transmission line serial connection that described first step impedance resonator, the second step impedance resonator, the 3rd step impedance resonator differ by two articles of width forms.
The input impedance Z of described first step impedance resonator, the second step impedance resonator, the 3rd step impedance resonator
inby formulae discovery below out:
In formula, j is imaginary unit, Z
a, Z
bbe respectively the impedance of two transmission lines of step impedance resonator, θ
a, θ
bbe respectively the electrical length of two transmission lines of step impedance resonator;
By making Z
in=0 condition of resonance can trying to achieve step impedance resonator is:
The step impedance resonator be made up of two transmission lines can produce two controlled transmission zeros when resonance, therefore, described first step impedance resonator, the second step impedance resonator, the 3rd step impedance resonator can produce six transmission zeros altogether, the frequency of transmission zero can by formula (1), (2) are tried to achieve above, that is, the position of two transmission zeros all can by the impedance (Z of step impedance resonator
a, Z
b) and electrical length (θ
a, θ
b) control completely.
Wider that transmission lines of described first Stepped Impedance resonance is connected with one end of the first input/output port I/O and the first transmission line respectively.
Narrower that transmission lines of described second step impedance resonance is connected with the other end of the first transmission line and one end of the second transmission line respectively.
Narrower that transmission lines of described 3rd Stepped Impedance resonance is connected with the other end of the second transmission line and the second input/output port I/O respectively.
Compared with prior art, tool has the following advantages and beneficial effect in the present invention:
1, the band stop filter of technology generally only can realize broadband belt resistance now, or realizes Double-frequency band elimination, is but difficult to realize broadband and double frequency simultaneously, and the filter construction that the present invention proposes, double-frequency broadband band resistance response can be realized easily;
2, the filter construction of the present invention's proposition is simple, is convenient to design and layout, by adjusting impedance ratio and the length of step impedance resonator, can control frequency ratio and the bandwidth ratio of two stopbands well;
3, the double-frequency broadband band stop filter of the present invention's proposition, two stopbands have excellent skirt selectivity, greatly can improve filter effect;
4, the double-frequency broadband band stop filter that the present invention proposes can be used for, in the multifrequency communication system of many standards, effectively reducing communication system volume and reducing costs.
Accompanying drawing explanation
Fig. 1 is the structural representation of double-frequency broadband band stop filter of the present invention.
Fig. 2 is the schematic diagram of a step impedance resonator.
Fig. 3 is the simulation result figure of double-frequency broadband band stop filter of the present invention.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
As shown in Figure 1, the double-frequency broadband band stop filter based on many step impedance resonator loading structure described in the present embodiment, include the first step impedance resonator, second step impedance resonator, 3rd step impedance resonator, first transmission line 7, second transmission line 8, first input/output port I/O9, second input/output port I/O10, wherein, one end of described first transmission line 7 is connected with the first input/output port I/O9, its other end is connected with one end of the second transmission line 8, the other end of described second transmission line 8 is connected with the second input/output port I/O10, signal is from one of them input/output port I/O feed-in, export from another input/output port I/O.Described first step impedance resonator, the second step impedance resonator, the 3rd step impedance resonator interval are side by side, described first step impedance resonator is connected with one end of the first input/output port I/O9 and the first transmission line 7 respectively, described second step impedance resonator is connected with the other end of the first transmission line 7 and one end of the second transmission line 8 respectively, and described 3rd step impedance resonator is connected with the other end of the second transmission line 8 and the second input/output port I/O10 respectively.
Two transmission lines 1,4 that described first step impedance resonator is differed by width are connected in series and form, and wherein, transmission line 1 is narrower, and transmission line 4 is wider, and this transmission line 4 is connected with one end of the first input/output port I/O9 and the first transmission line 7 respectively.
Two transmission lines 2,5 that described second step impedance resonator is differed by width are connected in series and form, and wherein, transmission line 2 is wider, and transmission line 5 is narrower, and this transmission line 5 is connected with the other end of the first transmission line 7 and one end of the second transmission line 8 respectively.
Two transmission lines 3,6 that described 3rd step impedance resonator is differed by width are connected in series and form, and wherein, transmission line 3 is wider, and transmission line 6 is narrower, and this transmission line 6 is connected with the other end of the second transmission line 8 and the second input/output port I/O10 respectively.
In the present embodiment, all transmission lines can use the common technology such as microstrip line, strip line to realize in industrial practical application.
As shown in Figure 2, the input impedance Z of described first step impedance resonator, the second step impedance resonator, the 3rd step impedance resonator
incan by formulae discovery below out:
In formula, j is imaginary unit, Z
a, Z
bbe respectively the impedance of two transmission lines of step impedance resonator, θ
a, θ
bbe respectively the electrical length of two transmission lines of step impedance resonator;
By making Z
in=0 condition of resonance can trying to achieve step impedance resonator is:
The step impedance resonator be made up of two transmission lines can produce two controlled transmission zeros when resonance, therefore, described first step impedance resonator, the second step impedance resonator, the 3rd step impedance resonator can produce six transmission zeros altogether, the frequency of transmission zero can by formula (1), (2) are tried to achieve above, that is, the position of two transmission zeros all can by the impedance (Z of step impedance resonator
a, Z
b) and electrical length (θ
a, θ
b) control completely.The position at these six zero points is set according to index demand, then can realizes the double-frequency broadband band stop filter of excellent performance.
In the present embodiment, given first stopband three dB bandwidth is 450MHz ~ 1941MHz (1491MHz, 124%), and the second stopband three dB bandwidth is 2095MHz ~ 3550MHz (1255MHz, 51.6%).By formula (1), (2) and software emulation fine setting, optimized the Distribution of Zeros can be obtained.After optimizing, the design parameter of Fig. 1 median filter is: Z
1=23 Ω, θ
1=90 °, Z
2=450.8 Ω, θ
2=90 °, Z
3=151.2 Ω, θ
3=90 °, Z
4=27 Ω, θ
4=90 °, Z
5=62 Ω, θ
5=90 °, Z
6=31 Ω, θ
6=90 °, Z
7=163 Ω, θ
7=90 °.
Use the simulation result of circuit simulating software AWR-Microwave Office as shown in Figure 3.Wherein, transverse axis represents the signal frequency of double-frequency broadband band stop filter of the present invention, and the longitudinal axis represents amplitude, comprises insertion loss (S
21) amplitude and return loss (S
11) amplitude.S
21represent that its corresponding mathematical function is: power output/input power (dB)=20 × log|S by the relation between the input power of the signal of double-frequency broadband band stop filter of the present invention and the power output of signal
21|.In the signals transmission of double-frequency broadband band stop filter of the present invention, the Partial Power of signal is reflected back toward signal source, is become reflection power by the power reflected.S
11represent that its corresponding mathematical function is as follows: reflection power/incident power=20 × log|S by the relation between the input power of the signal of double-frequency broadband band stop filter of the present invention and the reflection power of signal
11|.
The present invention includes and be not limited in the above-mentioned embodiment provided; those skilled in the art are under design of the present invention; under the premise without departing from the principles of the invention; different distortion and replacement can be made, such as use different technique to realize the present invention propose filter construction (as microstrip line, strip line; the line of rabbet joint etc.); change the value of design parameter, increase the exponent number etc. of filter, these distortion and replacement also belong to this patent protection range.
Claims (5)
1. based on the double-frequency broadband band stop filter of many step impedance resonator loading structure, it is characterized in that: include the first step impedance resonator, second step impedance resonator, 3rd step impedance resonator, first transmission line (7), second transmission line (8), first input/output port I/O (9), second input/output port I/O (10), wherein, one end of described first transmission line (7) is connected with the first input/output port I/O (9), its other end is connected with the one end of the second transmission line (8), the other end of described second transmission line (8) is connected with the second input/output port I/O (10), signal is from one of them input/output port I/O feed-in, export from another input/output port I/O, described first step impedance resonator, the second step impedance resonator, the 3rd step impedance resonator interval are side by side, described first step impedance resonator is connected with one end of the first input/output port I/O (9) and the first transmission line (7) respectively, described second step impedance resonator is connected with the other end of the first transmission line (7) and one end of the second transmission line (8) respectively, and described 3rd step impedance resonator is connected with the other end of the second transmission line (8) and the second input/output port I/O (10) respectively, the transmission line serial connection that described first step impedance resonator, the second step impedance resonator, the 3rd step impedance resonator differ by two articles of width forms.
2. the double-frequency broadband band stop filter based on many step impedance resonator loading structure according to claim 1, is characterized in that: the input impedance Z of described first step impedance resonator, the second step impedance resonator, the 3rd step impedance resonator
inby formulae discovery below out:
In formula, j is imaginary unit, Z
a, Z
bbe respectively the impedance of two transmission lines of step impedance resonator, θ
a, θ
bbe respectively the electrical length of two transmission lines of step impedance resonator;
By making Z
in=0 condition of resonance can trying to achieve step impedance resonator is:
The step impedance resonator be made up of two transmission lines can produce two controlled transmission zeros when resonance, therefore, described first step impedance resonator, the second step impedance resonator, the 3rd step impedance resonator can produce six transmission zeros altogether, the frequency of transmission zero can by formula (1), (2) are tried to achieve above, that is, the position of two transmission zeros all can by the impedance (Z of step impedance resonator
a, Z
b) and electrical length (θ
a, θ
b) control completely.
3. the double-frequency broadband band stop filter based on many step impedance resonator loading structure according to claim 1, is characterized in that: wider that transmission lines of described first Stepped Impedance resonance is connected with one end of the first input/output port I/O (9) and the first transmission line (7) respectively.
4. the double-frequency broadband band stop filter based on many step impedance resonator loading structure according to claim 1, is characterized in that: narrower that transmission lines of described second step impedance resonance is connected with the other end of the first transmission line (7) and one end of the second transmission line (8) respectively.
5. the double-frequency broadband band stop filter based on many step impedance resonator loading structure according to claim 1, is characterized in that: narrower that transmission lines of described 3rd Stepped Impedance resonance is connected with the other end of the second transmission line (8) and the second input/output port I/O (10) respectively.
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Cited By (3)
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| CN106067580A (en) * | 2016-08-03 | 2016-11-02 | 华南理工大学 | Ultra-wide stop-band low-pass filter based on step impedance resonator |
| CN106099279A (en) * | 2016-08-01 | 2016-11-09 | 中国电子科技集团公司第五十五研究所 | A kind of high-end precipitous roll-off filter of miniaturization passband |
| CN111276779A (en) * | 2020-02-19 | 2020-06-12 | 中天宽带技术有限公司 | Microstrip low-pass filter |
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| CN111276779A (en) * | 2020-02-19 | 2020-06-12 | 中天宽带技术有限公司 | Microstrip low-pass filter |
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