CN102820503B - Half-lumped miniaturized microwave filter and design method thereof - Google Patents
Half-lumped miniaturized microwave filter and design method thereof Download PDFInfo
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- CN102820503B CN102820503B CN201210297274.2A CN201210297274A CN102820503B CN 102820503 B CN102820503 B CN 102820503B CN 201210297274 A CN201210297274 A CN 201210297274A CN 102820503 B CN102820503 B CN 102820503B
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Abstract
The invention discloses a half-lumped miniaturized microwave filter. According to the prototype circuit of a low-pass filter, the conventional distributed capacitors are replaced by a lumped capacitor in the middle of a micro-strip transmission line, so that the size of the microwave filter is effectively reduced, and the low pass filtering characteristic of a wide stop-band is generated at the same time. By using the half-lumped miniaturized microwave filter, the problem of the structure miniaturization of the microwave filter in a modern communication system is solved effectively; and the half-lumped miniaturized microwave filter is small in structural size, low in pass-band insertion loss, and wide in stop-band frequency range, low in cost and high in precision, and can be machined by adopting a standard printed circuit board technology conveniently.
Description
Technical field
The invention belongs to the design field of microwave and millimetric wave device, be specifically related to a kind of miniaturized microwave filter of half lump.
Background technology
Along with the fast development of wireless communication system, to the extraction of signal and the requirement of utilization more and more higher.Microwave filter is as one of Primary Component indispensable in modern communications equipment, it can the various unwanted signal of filtering and noise signal effectively, reduce the signal disturbing between each circuit, thus ensure communication equipment normal, effectively work, realize high-quality communication, and then reach effective utilization of frequency resource.
Microwave filter is extensive application in the systems such as microwave and millimeter wave communication, radar navigation, electronic countermeasures, missile guidance, test instrumentation, and its performance quality often directly has influence on the performance of whole system.Generally common microwave filter form mainly contains following several: waveguide filter, microstrip filter, strip line filter and coaxial cavity filter etc.According to different applications, need to adopt different version to realize.And along with the development of System-in-Package technology, to the miniaturization of microwave device and high performance demand more and more extensive.Therefore, as one of main components in communication system, how to design the attention that the microwave filter satisfied the demands more and more causes people, the research of high performance miniaturized microwave filter is also of great significance and value.
Traditional microwave low-pass filter is mainly realized by the resonant tank between lumped capacity and lumped inductance, but the applying frequency scope of this mode is very limited, because the parasitic capacitance that lumped capacity and inductance self produce within the scope of microwave frequency band and stray inductance can have an impact to the performance of circuit.Adopt distributed parameters to come lumped capacity in realizing circuit structure and inductance, the not high enough problem of frequency application can be solved well.In " Equivalent-circuit analysis and lowpass filter design of split ring resonator DGS " article that the people such as Wu B. deliver on Journal of electromagnetic waves and application periodical, propose to adopt the structure on split-ring resonator structure binding deficient ground to realize low pass filter.In " Sharp-rejection lowpass filter with controllable transmission zero " article that the people such as Zhang J. deliver on Progress in electromagnetic research periodical, propose to adopt complementary split-rings resonator to design low pass filter.But the structure of these filters is comparatively complicated, be not easy to regulate, and its performance also needs to improve.
Summary of the invention
In order to overcome defect existing in above-mentioned prior art, the invention provides a kind of miniaturized microwave filter of half lump, according to the prototype circuit structure of low pass filter, in the middle of microstrip transmission line, directly use lumped capacity to replace traditional distributed capacitor, obtain the low-frequency filter characteristics with Wide stop bands, little based on microwave filter structure size of the present invention, logical in-band insertion loss is little, stop band frequency range is wide, and is convenient to adopt standard printed circuit board technique to process.
For achieving the above object, the concrete scheme of the present invention's employing is as follows:
According to an aspect of the present invention, a kind of miniaturized microwave filter of half lump is provided, comprise microwave-medium substrate, the first port 201, second port 202 be arranged on described microwave-medium substrate, also comprise be arranged on described microwave-medium substrate as lower component:
-be connected to the first microstrip transmission line 901 between described first port 201 and the second port 202;
-be connected to the second microstrip transmission line 902, the 3rd microstrip transmission line 903, second lumped capacity 302, the 4th microstrip transmission line 904, the 5th microstrip transmission line 905 between described first port 201 and the second port 202 in turn; Wherein, form series resonance between described second microstrip transmission line 902, second lumped capacity 302, the 4th microstrip transmission line 904 and create a transmission zero, forming resonance between described 3rd microstrip transmission line 903, second lumped capacity 302, the 4th microstrip transmission line 904 and additionally produce two transmission zeros;
-the first lumped capacity 301, it is connected to one end that described second microstrip transmission line 902 connects described 3rd microstrip transmission line 903, and described second microstrip transmission line 902 is by described first lumped capacity 301 ground connection;
-three lumped capacity 303, it is connected to one end that described 5th microstrip transmission line 905 connects described 4th microstrip transmission line 904, and described 5th microstrip transmission line 905 is by described 3rd lumped capacity 303 ground connection.
Preferably, described microwave-medium substrate is lossy dielectric material, relative dielectric constant=2.65, dielectric thickness=0.5 millimeter, surface metal thickness=35 micron, loss angle tangent=0.002.
Preferably, the first lumped capacity is flaky electric capacity, and model is 0603, and capacitance size is 5.2 pico farads; Second lumped capacity is flaky electric capacity, and model is 0402, and capacitance size is 0.5 pico farad; 3rd lumped capacity is flaky electric capacity, and model is 0603, and capacitance size is 5.2 pico farads.
Preferably, the input and output feeder line of described first port 201 and the second port 202 all adopts 50 ohm microstrip forms, and mates with SMA coaxial fitting.
According to another aspect of the present invention, a kind of method for designing of the miniaturized microwave filter according to described half lump provided by the invention is also provided, comprises the steps:
Steps A: lumped capacity is set on microwave-medium substrate and microstrip transmission line is set between the first port 201 and the second port 202, to produce three transmission zeros;
Step B: according to the length of design parameter determination microstrip transmission line and the capacitance of lumped capacity.
Preferably, described steps A comprises the steps:
-between described first port 201 and the second port 202, the first microstrip transmission line 901 is set;
-described first port 201 with the second microstrip transmission line 902, the 3rd microstrip transmission line 903, second lumped capacity 302, the 4th microstrip transmission line 904, the 5th microstrip transmission line 905 that are connected successively are set between second port 202;
-the first lumped capacity 301 be connected with one end that described second microstrip transmission line 902 is connected described 3rd microstrip transmission line 903 is set;
-the 3rd lumped capacity 303 be connected with one end that described 5th microstrip transmission line 905 is connected described 4th microstrip transmission line 904 is set.
Preferably, described step B comprises the steps:
-length of described first microstrip transmission line 901 is determined according to low-pass cut-off frequencies parameter;
-length of the second microstrip transmission line 902 and the 5th microstrip transmission line 905 is determined according to the location parameter of the second transmission zero and the 3rd transmission zero;
-length of the 3rd microstrip transmission line 903 and the 4th microstrip transmission line 904 is determined according to the location parameter of the 3rd transmission zero;
-capacitance of described second lumped capacity 302 is determined according to stop band frequency range parameter,
Wherein, described 3rd transmission zero is that in described three transmission zeros, position is near the transmission zero of passband, and described second transmission zero is the transmission zero of position time close passband in described three transmission zeros.
Beneficial effect of the present invention: efficiently solve the miniaturized structure of microwave filter in millimeter-wave systems and high performance problem, distributed capacitor is replaced by using lumped capacity between microstrip transmission line, greatly reduce the area of filter, meet the requirement of Modern Communication System miniaturization; Insertion loss in passband is little, and in stopband range, introduce three transmission zeros, increases the blanketing frequency scope to spurious resonance; This filter construction is simple, is convenient to adopt standard printed circuit board technique to process realization, and cost is low, and precision is high.
Accompanying drawing explanation
Fig. 1 is the vertical view of the structure of miniaturized microwave filter according to half lump provided by the invention;
Fig. 2 be according to the miniaturized microwave filter of half lump provided by the invention transmission characteristic along with the second lumped capacity C
2the curve chart of change;
Fig. 3 be according to the miniaturized microwave filter of half lump provided by the invention transmission characteristic along with the curve chart of the length l change of the 3rd microstrip transmission line and/or the 4th microstrip transmission line;
Fig. 4 be according to the miniaturized microwave filter of half lump provided by the invention transmission characteristic along with the curve chart of the length a change of the second microstrip transmission line and/or the 5th microstrip transmission line;
Fig. 5 be according to the miniaturized microwave filter of half lump provided by the invention test result and simulation result comparison diagram.
Embodiment
In order to make technological means of the present invention, creation characteristic and reach object be easy to understand understand, set forth the present invention further below in conjunction with specific embodiment.
The invention provides a kind of miniaturized microwave filter of half lump, comprise microwave-medium substrate, microstrip transmission line and lumped capacity.Described microstrip transmission line is etched in microwave-medium plate surface, distributed capacitor is replaced by adopting lumped capacity in the middle of microstrip transmission line, substantially reduce the physical dimension of circuit, in stopband, introduce three transmission zeros simultaneously, increase the frequency range of stopband.
As shown in Figure 1, for the vertical view of the miniaturized microwave filter according to half lump provided by the invention, first microstrip transmission line 901 is connected between the first port 201 and the second port 202, can obtain different low-pass cut-off frequencies by the length designing described first microstrip transmission line 901.Wherein, described first port 201 can be input port or output port, and correspondingly, described second port 202 is output port or input port, and this does not affect flesh and blood of the present invention, and it will not go into details secondary.
The second microstrip transmission line 902, the 3rd microstrip transmission line 903, second lumped capacity 302, the 4th microstrip transmission line 904, the 5th microstrip transmission line 905 is also connected with in turn between described first port 201 and the second port 202.Second microstrip transmission line 902 and the 5th microstrip transmission line 905 are connected to ground respectively by the first lumped capacity 301 and the 3rd lumped capacity 303.
Wherein, form series resonance between described second microstrip transmission line 902, second lumped capacity 302, the 4th microstrip transmission line 904 and create a transmission zero, being used for improving the steepness of transmission characteristic; Form resonance between described 3rd microstrip transmission line 903, second lumped capacity 302, the 4th microstrip transmission line 904 and additionally produce two transmission zeros, be used for increasing the width of stop band frequency range.
In a preference of the present embodiment, described microwave-medium substrate is lossy dielectric material, relative dielectric constant=2.65, dielectric thickness=0.5 millimeter, surface metal thickness=35 micron, loss angle tangent=0.002.The input and output feeder line of described first port 201 and the second port 202 all adopts 50 ohm microstrip forms, and mates with SMA coaxial fitting.
As shown in Figure 2, show according to the transmission characteristic of the miniaturized microwave filter of half lump provided by the invention along with the second lumped capacity C
2the curve chart of change, as seen from the figure, along with C
2capacitance size becomes large, and stop band frequency range narrows.
As shown in Figure 3, show according to the transmission characteristic of the miniaturized microwave filter of the half lump provided by the invention curve chart along with the length l change of the 3rd microstrip transmission line and/or the 4th microstrip transmission line, as seen from the figure, along with l becomes large, the position of the 3rd transmission zero is more close toward passband, reduce stop band frequency range, wherein, described 3rd transmission zero be in described three transmission zeros position near the transmission zero of passband.
As shown in Figure 4, show according to the transmission characteristic of the miniaturized microwave filter of the half lump provided by the invention curve chart along with the length a change of the second microstrip transmission line and/or the 5th microstrip transmission line, as seen from the figure, along with a becomes large, what the position between the second transmission zero and the 3rd transmission zero was divided more opens, wherein, described 3rd transmission zero is that in described three transmission zeros, position is near the transmission zero of passband, and described second transmission zero is the transmission zero of position time close passband in described three transmission zeros.
As shown in Figure 5, show the test result according to the miniaturized microwave filter of half lump provided by the invention and simulation result comparison diagram, from comparison diagram, simulation result and test result are substantially identical, reach expected effects.
Present invention also offers a kind of method for designing of the miniaturized microwave filter according to described half lump provided by the invention, comprise the steps:
Steps A: lumped capacity is set on microwave-medium substrate and microstrip transmission line is set between the first port 201 and the second port 202, to produce three transmission zeros;
Step B: according to the length of design parameter determination microstrip transmission line and the capacitance of lumped capacity.
Particularly, described steps A comprises the steps:
-between described first port 201 and the second port 202, the first microstrip transmission line 901 is set;
-described first port 201 with the second microstrip transmission line 902, the 3rd microstrip transmission line 903, second lumped capacity 302, the 4th microstrip transmission line 904, the 5th microstrip transmission line 905 that are connected successively are set between second port 202;
-the first lumped capacity 301 be connected with one end that described second microstrip transmission line 902 is connected described 3rd microstrip transmission line 903 is set;
-the 3rd lumped capacity 303 be connected with one end that described 5th microstrip transmission line 905 is connected described 4th microstrip transmission line 904 is set.
More specifically, described step B comprises the steps:
-length of described first microstrip transmission line 901 is determined according to low-pass cut-off frequencies parameter;
-length of the second microstrip transmission line 902 and the 5th microstrip transmission line 905 is determined according to the location parameter of the second transmission zero and the 3rd transmission zero;
-length of the 3rd microstrip transmission line 903 and the 4th microstrip transmission line 904 is determined according to the location parameter of the 3rd transmission zero;
-capacitance of described second lumped capacity 302 is determined according to stop band frequency range parameter,
Wherein, described 3rd transmission zero is that in described three transmission zeros, position is near the transmission zero of passband, and described second transmission zero is the transmission zero of position time close passband in described three transmission zeros.
To sum up, lead to in-band insertion loss according to the miniaturized microwave filter of half lump provided by the invention and be less than 0.9dB, three transmission zeros are created in stopband, when with-20dB for suppression standard in stopband time, stop band frequency range is from 0.83GHz to 2.37GHz, and the physical dimension size of filter is 0.04 λ × 0.03 λ.Visible, the present invention effectively can solve the miniaturized structure of microwave filter in millimeter-wave systems and high performance problem, by using lumped capacity to replace distributed capacitor between microstrip transmission line, greatly reducing the size of filter, meeting the requirement of Modern Communication System miniaturization; This filter construction is simple simultaneously, is convenient to adopt standard printed circuit board technique to process realization, and cost is low, and precision is high.
More than show and describe general principle of the present invention, principal character and advantage of the present invention.Those skilled in the art should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection range is defined by appending claims and equivalent thereof.
Claims (6)
1. the miniaturized microwave filter of one and half lumps, comprise microwave-medium substrate, the first port (201) be arranged on described microwave-medium substrate, the second port (202), it is characterized in that, also comprise be arranged on described microwave-medium substrate as lower component:
-be connected to the first microstrip transmission line (901) between described first port (201) and the second port (202);
-be connected to the second microstrip transmission line (902), the 3rd microstrip transmission line (903), the second lumped capacity (302), the 4th microstrip transmission line (904), the 5th microstrip transmission line (905) between described first port (201) and the second port (202) in turn; Wherein, form series resonance between described second microstrip transmission line (902), the second lumped capacity (302), the 4th microstrip transmission line (904) and create a transmission zero, forming resonance between described 3rd microstrip transmission line (903), the second lumped capacity (302), the 4th microstrip transmission line (904) and additionally produce two transmission zeros;
-the first lumped capacity (301), it is connected to one end that described second microstrip transmission line (902) connects described 3rd microstrip transmission line (903), and described second microstrip transmission line (902) is by described first lumped capacity (301) ground connection;
-three lumped capacity (303), it is connected to one end that described 5th microstrip transmission line (905) connects described 4th microstrip transmission line (904), and described 5th microstrip transmission line (905) is by described 3rd lumped capacity (303) ground connection;
Described first microstrip transmission line (901) is parallel relationship with described second microstrip transmission line (902) be connected successively, the 3rd microstrip transmission line (903), the second lumped capacity (302), the 4th microstrip transmission line (904), the 5th microstrip transmission line (905).
2. the miniaturized microwave filter of half lump according to claim 1, is characterized in that, described microwave-medium substrate is lossy dielectric material, relative dielectric constant=2.65, dielectric thickness=0.5 millimeter, surface metal thickness=35 micron, loss angle tangent=0.002.
3. the miniaturized microwave filter of half lump according to claim 1, is characterized in that, the first lumped capacity (301) is flaky electric capacity, and model is 0603, and capacitance size is 5.2 pico farads; Second lumped capacity (302) is flaky electric capacity, and model is 0402, and capacitance size is 0.5 pico farad; 3rd lumped capacity (303) is flaky electric capacity, and model is 0603, and capacitance size is 5.2 pico farads.
4. the miniaturized microwave filter of half lump according to claim 1, it is characterized in that, the input and output feeder line of described first port (201) and the second port (202) all adopts 50 ohm microstrip forms, and mates with SMA coaxial fitting.
5. a method for designing for the miniaturized microwave filter of half lump according to claim 1, is characterized in that, comprise the steps:
Steps A: lumped capacity is set on microwave-medium substrate and microstrip transmission line is set between the first port (201) and the second port (202), to produce three transmission zeros;
Step B: according to the length of design parameter determination microstrip transmission line and the capacitance of lumped capacity;
Described steps A comprises the steps:
-between described first port (201) and the second port (202), the first microstrip transmission line (901) is set;
-described first port (201) with the second microstrip transmission line (902), the 3rd microstrip transmission line (903), the second lumped capacity (302), the 4th microstrip transmission line (904), the 5th microstrip transmission line (905) that are connected successively are set between the second port (202);
The first lumped capacity (301) that one end that-setting is connected described 3rd microstrip transmission line (903) with described second microstrip transmission line (902) is connected;
-the 3rd lumped capacity (303) be connected with one end that described 5th microstrip transmission line (905) is connected described 4th microstrip transmission line (904) is set.
6. the method for designing of the miniaturized microwave filter of half lump according to claim 5, is characterized in that, described step B comprises the steps:
-length of described first microstrip transmission line (901) is determined according to low-pass cut-off frequencies parameter;
-length of the second microstrip transmission line (902) and the 5th microstrip transmission line (905) is determined according to the location parameter of the second transmission zero and the 3rd transmission zero;
-length of the 3rd microstrip transmission line (903) and the 4th microstrip transmission line (904) is determined according to the location parameter of the 3rd transmission zero;
-capacitance of described second lumped capacity (302) is determined according to stop band frequency range parameter,
Wherein, described 3rd transmission zero is that in described three transmission zeros, position is near the transmission zero of passband, and described second transmission zero is the transmission zero of position time close passband in described three transmission zeros.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104078726B (en) * | 2014-06-04 | 2016-07-06 | 中国电子科技集团公司第十研究所 | Parallel connection type one side elliptic function line filter |
| CN104064841A (en) | 2014-07-10 | 2014-09-24 | 中怡(苏州)科技有限公司 | Microstrip line filter with defected ground structure |
| CN105406831A (en) * | 2015-12-21 | 2016-03-16 | 成都新欣神风电子科技有限公司 | Semi-lumped microwave band-pass filtering circuit and filter |
| CN112886936B (en) * | 2021-04-29 | 2022-03-01 | 中国电子科技集团公司第九研究所 | Novel miniature ultra wide band high pass filter |
| CN116259940B (en) * | 2023-04-14 | 2024-05-03 | 天津理工大学 | Dual-passband filter composed of semi-lumped elements |
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| US4250475A (en) * | 1979-05-01 | 1981-02-10 | Rca Corporation | Adjustable passband filter |
| CN101593863A (en) * | 2009-06-26 | 2009-12-02 | 北京信息科技大学 | A kind of adjustable microwave band-pass filter |
| CN102610883A (en) * | 2012-03-22 | 2012-07-25 | 南京理工大学常熟研究院有限公司 | 90-MHz low-insertion-loss micro low pass filter |
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