CN106450614A - Ultra-wide stopband miniaturized microstrip resonant cell low pass filter - Google Patents
Ultra-wide stopband miniaturized microstrip resonant cell low pass filter Download PDFInfo
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- CN106450614A CN106450614A CN201611191924.XA CN201611191924A CN106450614A CN 106450614 A CN106450614 A CN 106450614A CN 201611191924 A CN201611191924 A CN 201611191924A CN 106450614 A CN106450614 A CN 106450614A
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- narrow line
- resonant element
- high impedance
- open stub
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
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Abstract
The invention provides an ultra-wide stopband miniaturized microstrip resonant cell low pass filter, which comprises a symmetrical resonant unit (1) and an asymmetrical resonant unit (2), wherein each of the two resonant units comprises high-impedance narrow wires (3), non-uniform open circuit short cutting wires (4) and a gap capacitor (5); four sections of high-impedance narrow wires (3) in the symmetrical resonant unit (1) are connected through a crossed point; each of the upper and lower high-impedance narrow wires (3) is connected with one non-uniform open circuit short cutting wire (4); the gap capacitors (5) are arranged between the left and right high-impedance narrow wires (3) and the non-uniform open circuit short cutting wires (4); three sections of high-impedance narrow wires (3) in the asymmetrical resonant unit (2) are connected through the T-shaped joints; one section of high-impedance narrow wire (3) is used for connecting the non-uniform open circuit short cutting wire (4); the gap capacitor (5) is arranged between the high-impedance narrow wire (3) and the nonuniform open circuit short cutting wire (4).
Description
Technical field
The invention belongs to radio frequency and Design of microwave filters field are and in particular to a kind of ultra-wide stopband Mini Microstrip resonance
Unit low pass filter.
Background technology
Microwave filter be a kind of in the range of certain frequency provide signal transmission and other frequency ranges suppress signal frequency
Rate control circuit, is the requisite ingredient in the fields such as radar system, communication system, measuring system.Preferably wave filter
It is a kind of two-port network, it should have frequency selective characteristic：Can undamped transmit in logical inband signaling, in stopband
Signal can not transmit completely.According to the difference of passband and stopband relative position, microwave filter can be divided into low pass, high pass, band logical
With band four kinds of fundamental types of resistance.Wherein, low pass filter is to allow to pass through less than the signal of cut-off frequency, but is higher than cut-off frequency
Signal intransitable electronic filtering device, be generally used to the higher hamonic wave of suppression device generation and other active devices produce
Raw high frequency noise signal.
Modern microwave Circuits System requires low pass filter to have little Insertion Loss in passband, must also have high simultaneously
Out-of-band rejection degree and wide rejection band scope, pure to ensure signal spectrum, there is no the interference signal of other frequency ranges.In addition filter
The processing condition of ripple device will readily satisfy, and version can not be too complicated, so ensure that in batch production process
The concordance of microwave filter.
Existing Microstrip Low-Pass is realized often through Stepped Impedance structure.However, the passband of this structure and resistance
Interband transition is not precipitous, and it is impossible to provide wider stopband, parasitic passband is nearer, the such as cut-off frequency of steeper to be obtained,
Then need to increase exponent number, on the one hand this can bring bigger Insertion Loss, circuit size on the other hand will be made bigger than normal, be not suitable for
In the case that volume is required, limit its application.
Content of the invention
It is an object of the invention to provide a kind of ultra-wide stopband Mini Microstrip resonant element low pass filter, overcome or subtract
At least one drawbacks described above of light prior art.
The purpose of the present invention is achieved through the following technical solutions：A kind of ultra-wide stopband Mini Microstrip resonant element low pass filtered
Ripple device, including two microstrip lines and be arranged at the symmetrical resonant element between this two microstrip line and asymmetric resonant element,
Described symmetrical resonant element, including the narrow line of high impedance, non-homogeneous open stub, gap capacitance, four sections of described height
The narrow line of impedance passes through crossed joint and is connected, wherein, described upper and lower two high impedances narrow line one section of described non-homogeneous open circuit cutting back of each connection
Line, is provided with described interval electric capacity between the narrow line of described left and right two high impedance and described non-homogeneous open stub；
Described asymmetric resonant element, including the narrow line of high impedance, non-homogeneous open stub, gap capacitance, described in three sections
The narrow line of high impedance passes through T-shaped section and is connected, and wherein, the narrow line of high impedance described in first paragraph is used for connecting described symmetrical resonant element, the
The narrow line of high impedance described in two-stage nitration is used for connecting described microstrip line, and the narrow line of the 3rd section of described high impedance is used for connecting described non-homogeneous open
Short out transversal, is provided with described interval electric capacity between the described narrow line of high impedance and described non-homogeneous open stub.
Preferably, it is also associated with microstrip line between described symmetrical resonant element and described asymmetric resonant element.
Preferably, described non-homogeneous open stub is axisymmetric zigzag.
Preferably, the narrow line of described upper and lower two high impedances in described symmetrical resonant element is connected to described non-homogeneous open circuit
The centre position of stub, described at each setting one between two this non-homogeneous open stub and the narrow line of described left and right two high impedance
Interval electric capacity；The narrow line of described high impedance in described asymmetric resonant element is connected to the centre of described non-homogeneous open stub
Respectively set between position, this non-homogeneous open stub and the narrow line of high impedance described in second segment and the narrow line of the 3rd section of described high impedance
Put interval electric capacity described at one.
The having the beneficial effects that of a kind of ultra-wide stopband Mini Microstrip resonant element low pass filter provided by the present invention,
In the form of asymmetric micro-band resonance unit with symmetrical micro-band resonance unit cascade, this structure can introduce many in stopband
Individual transmission zero, this makes, and wave filter has high Out-of-band rejection degree and ultra-wide stopband characteristic and selectivity is fine；On the other hand,
This form low pass filter can make circuit have Slow-wave effect, contribute to reducing circuit size, realize the small-sized of low pass filter
Change.
Brief description
Fig. 1 is the illustraton of model of ultra-wide stopband Mini Microstrip resonant element low pass filter of the present invention；
Fig. 2 is the schematic diagram of ultra-wide stopband Mini Microstrip resonant element low pass filter of the present invention；
Fig. 3 existing Stepped Impedance line low pass filter illustraton of model；
Fig. 4 is the S parameter figure of ultra-wide stopband Mini Microstrip resonant element low pass filter of the present invention；
The S parameter figure of Fig. 5 existing Stepped Impedance line low pass filter.
Reference：
Between the symmetrical resonant element of 1-, the asymmetric resonant element of 2-, the narrow line of 3- high impedance, the non-homogeneous open stub of 4-, 5-
Gap electric capacity.
Specific embodiment
For making purpose, technical scheme and advantage that the present invention is implemented clearer, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, identical from start to finish or class
As the label element that represents same or similar element or there is same or like function.Described embodiment is the present invention
A part of embodiment, rather than whole embodiments.Embodiment below with reference to Description of Drawings is exemplary it is intended to use
In the explanation present invention, and it is not considered as limiting the invention.Based on the embodiment in the present invention, ordinary skill people
The every other embodiment that member is obtained under the premise of not making creative work, broadly falls into the scope of protection of the invention.
Below in conjunction with the accompanying drawings the ultra-wide stopband Mini Microstrip resonant element low pass filter of the present invention is done detailed further
Describe in detail bright.
As shown in figure 1, a kind of ultra-wide stopband Mini Microstrip resonant element low pass filter, including two microstrip lines and
It is arranged at the symmetrical resonant element 1 between this two microstrip line and asymmetric resonant element 2, symmetrical resonant element 1 is right with non-simultaneously
Claim can also select to connect another microstrip line between resonant element 2.Two resonant element one end are connected to by the narrow line of high impedance 3
Middle 50 Ω microstrip lines, the other end is connected with input and output side respectively, and input/output port is 50 Ω microstrip lines.In addition,
Micro-strip medium substrate can be selected for Rogers 4350 (εr=3.5), substrate thickness 20mil.
Symmetrical resonant element 1 is symmetrical structure, including the narrow line of high impedance 3, non-homogeneous open stub 4, gap capacitance 5,
There is low-pass characteristic and Slow-wave effect and so that stopband is widened and miniaturized structure, the narrow line of high impedance 3 and non-homogeneous open stub 4
Length together decided on the resistance band of wave filter and stopband suppression.The narrow line 4 of four sections of high impedances passes through crossed joint and is connected, its
In, the narrow line 3 of upper and lower two high impedances respectively connects one section of non-homogeneous open stub 4, and this non-homogeneous open stub 4 is chosen as axle pair
The zigzag claiming, and the narrow line 3 of this upper and lower two high impedance is connected in the non-homogeneous open stub 4 of this axisymmetric zigzag
Between position, be provided with interval electric capacity 5 between the narrow line 3 of left and right two high impedance and non-homogeneous open stub 4, this interval electric capacity 5 is
It is located between two non-homogeneous open stub 4 and the narrow line 3 of left and right two high impedance it is ensured that narrow line 3 leaves with high impedance respectively everywhere
Space.
Asymmetric resonant element 2 is unsymmetric structure, and it is the half of symmetrical structure, has deepened stopband suppression further,
Expand bandwidth of rejection, also include the narrow line of high impedance 3, non-homogeneous open stub 4, gap capacitance 5.The narrow line 3 of three sections of high impedances
It is connected by T-shaped section, wherein, the narrow line of first paragraph high impedance 3 is used for connected symmetrical dendrimer resonant element 1, and the narrow line of second segment high impedance 3 is used
In connecting described microstrip line, the 3rd section of narrow line of high impedance 3 is used for connecting non-homogeneous open stub 4, this non-homogeneous open circuit cutting back
It is short that the narrow line of high impedance 3 that line 4 is chosen as in axisymmetric zigzag, and asymmetric resonant element 2 is connected to non-homogeneous open circuit
The centre position of transversal 4, is provided with interval electric capacity 5, this interval electric capacity 5 between the narrow line of high impedance 3 and non-homogeneous open stub 4
For be located at respectively at two this non-homogeneous open stub 4 and the narrow line of second segment high impedance 3 and the 3rd section of narrow line of high impedance 3 it
Between it is ensured that narrow line 3 leaves space with high impedance.
As shown in Fig. 2 resonant element 1 is symmetrical structure, mainly by gap capacitance 5, the narrow line of high impedance 3 and non-homogeneous open circuit
Stub 4 forms.Gap capacitance 5 ensure that signal transmits and reduces decay in high frequency treatment energy transition.The narrow line of high impedance 3 introduces string
Connection inductive effect, non-homogeneous open stub 4 introduces capacity effect, and both collectively form LC series resonant tank, this series connection
Resonant tank can introduce transmission zero on the right side of filter passband, and the position of transmission zero is exactly the resonance frequency of series resonant tank
Rate, because the presence of transmission zero makes stopband widen, and assumes low-pass characteristic.In addition, compact micro-band resonance unit can be in
Now significant Slow-wave effect, contributes to reducing the size of wave filter.
Resonant element 2 is unsymmetric structure, and it intercepts the top half of resonant element 1 as an independent unit, this
Planting unsymmetric structure makes the distributed inductance of resonant element and electric capacity increase further, and stopband center frequency declines, and introduces new
Transmission zero, has deepened the suppression of stopband to a certain extent, has more widened stop band frequency range, and Slow-wave effect is more simultaneously
Significantly.
As shown in Figure 1 to Figure 3, in the form of asymmetric resonant element with symmetrical resonant element cascade, this structure energy
Enough introduce multiple transmission zeros in stopband, this makes wave filter have high Out-of-band rejection degree and ultra-wide stopband characteristic and selection
Property very well, its S parameter curve is as shown in figure 4, (as Fig. 5 compared with traditional Stepped Impedance Microstrip Low-Pass S parameter curve
Shown), introduce three transmission zeros in stopband, be 4.9～18.7GHz in -10dB frequency range below, relative bandwidth is
117%, relative bandwidth lifting 24%；Stopband is 5.4～18GHz in -20dB frequency range below, and relative bandwidth is 107%, phase
40% is lifted to bandwidth.
On the other hand, this form low pass filter can make circuit have Slow-wave effect, contribute to reducing circuit size, realize
The miniaturization of low pass filter, as shown in Figure 2.(as Fig. 3 institute compared with traditional Stepped Impedance Microstrip Low-Pass model
Show), whole moulded dimension is only 8.8mm × 3.8mm, volume-diminished to only original 32.6%, closely with compact.
For more preferable performance characteristic, parameter is compared as follows shown in table：
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, and any
Those familiar with the art the invention discloses technical scope in, the change or replacement that can readily occur in, all answer
It is included within the scope of the present invention.Therefore, protection scope of the present invention with described scope of the claims should be
Accurate.
Claims (4)
1. a kind of ultra-wide stopband Mini Microstrip resonant element low pass filter is it is characterised in that include two microstrip lines, Yi Jishe
It is placed in the symmetrical resonant element (1) between this two microstrip line and asymmetric resonant element (2),
Described symmetrical resonant element (1), including the narrow line of high impedance (3), non-homogeneous open stub (4), gap capacitance (5), four
The narrow line of Duan Suoshu high impedance (3) passes through crossed joint and is connected, wherein, the narrow line (3) of described upper and lower two high impedances is each connect one section described in
Non-homogeneous open stub (4), is arranged between the narrow line (3) of described left and right two high impedance and described non-homogeneous open stub (4)
There is described interval electric capacity (5)；
Described asymmetric resonant element (2), including the narrow line of high impedance (3), non-homogeneous open stub (4), gap capacitance (5),
The narrow line (3) of three sections of described high impedances is passed through T-shaped section and is connected, and wherein, it is described right that the narrow line of high impedance described in first paragraph (3) is used for connecting
Claim resonant element (1), the narrow line of high impedance described in second segment (3) is used for connecting described microstrip line, the narrow line of the 3rd section of described high impedance
(3) it is used for connecting described non-homogeneous open stub (4), the described narrow line (3) of high impedance and described non-homogeneous open stub (4)
Between be provided with described interval electric capacity (5).
2. ultra-wide stopband Mini Microstrip resonant element low pass filter according to claim 1 is it is characterised in that described
Symmetrically it is also associated with microstrip line between resonant element (1) and described asymmetric resonant element (2).
3. ultra-wide stopband Mini Microstrip resonant element low pass filter according to claim 1 is it is characterised in that described
Non-homogeneous open stub (4) is axisymmetric zigzag.
4. ultra-wide stopband Mini Microstrip resonant element low pass filter according to claim 3 is it is characterised in that described
The narrow line of described upper and lower two high impedances (3) in symmetrical resonant element (1) are connected to the centre of described non-homogeneous open stub (4)
Position, interval electricity described at each setting one between two this non-homogeneous open stub (4) and the narrow line of described left and right two high impedances (3)
Hold (5)；The narrow line of described high impedance (3) in described asymmetric resonant element (2) is connected to described non-homogeneous open stub (4)
Centre position, this non-homogeneous open stub (4) and the narrow line of high impedance described in second segment (3) and the 3rd section of described high impedance
Interval electric capacity (5) described at each setting one between narrow line (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611191924.XA CN106450614B (en) | 2016-12-21 | 2016-12-21 | A kind of ultra-wide stopband Mini Microstrip resonant element low-pass filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611191924.XA CN106450614B (en) | 2016-12-21 | 2016-12-21 | A kind of ultra-wide stopband Mini Microstrip resonant element low-pass filter |
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| Publication Number | Publication Date |
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| CN106450614A true CN106450614A (en) | 2017-02-22 |
| CN106450614B CN106450614B (en) | 2019-03-29 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030019526A (en) * | 2003-02-10 | 2003-03-06 | 임종식 | A New Type of Low Pass Filters Using Defected Ground Structure and Capacitively Compensated Transmission Line |
| CN1933234A (en) * | 2006-10-12 | 2007-03-21 | 上海交通大学 | Super wide band microstrip filter |
| CN103606725A (en) * | 2013-11-25 | 2014-02-26 | 中国电子科技集团公司第四十一研究所 | Parallel open-circuit stepped impedance low-pass filter |
| US20140191827A1 (en) * | 2013-01-04 | 2014-07-10 | National Tsing Hua University | Wideband high frequency bandpass filter |
| CN105529514A (en) * | 2016-01-14 | 2016-04-27 | 南京航空航天大学 | Circular-ring multi-mode coupling ultra-wideband micro-strip band-pass filter |
-
2016
- 2016-12-21 CN CN201611191924.XA patent/CN106450614B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030019526A (en) * | 2003-02-10 | 2003-03-06 | 임종식 | A New Type of Low Pass Filters Using Defected Ground Structure and Capacitively Compensated Transmission Line |
| CN1933234A (en) * | 2006-10-12 | 2007-03-21 | 上海交通大学 | Super wide band microstrip filter |
| US20140191827A1 (en) * | 2013-01-04 | 2014-07-10 | National Tsing Hua University | Wideband high frequency bandpass filter |
| CN103606725A (en) * | 2013-11-25 | 2014-02-26 | 中国电子科技集团公司第四十一研究所 | Parallel open-circuit stepped impedance low-pass filter |
| CN105529514A (en) * | 2016-01-14 | 2016-04-27 | 南京航空航天大学 | Circular-ring multi-mode coupling ultra-wideband micro-strip band-pass filter |
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| CN106450614B (en) | 2019-03-29 |
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