CN108155447A - Highly selective, high common mode inhibition and compact-sized second order balance bandpass filter - Google Patents
Highly selective, high common mode inhibition and compact-sized second order balance bandpass filter Download PDFInfo
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- CN108155447A CN108155447A CN201711340648.3A CN201711340648A CN108155447A CN 108155447 A CN108155447 A CN 108155447A CN 201711340648 A CN201711340648 A CN 201711340648A CN 108155447 A CN108155447 A CN 108155447A
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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 discloses a kind of highly selective, high common mode inhibition and compact-sized second order balance bandpass filter, including the first resonator and the second resonator, first resonator and the second resonator are split-ring resonator, and open-end, the both ends of first resonator are symmetrically arranged with the first feeder line and third feeder line, first feeder line is connected with the first open circuit minor matters, the third feeder line is connected with third open circuit minor matters, the both ends of second resonator are symmetrically arranged with the second feeder line and the 4th feeder line, second feeder line is connected with the second open circuit minor matters, 4th feeder line is connected with the 4th open circuit minor matters.The present invention has highly selective and high common mode inhibition capacity.
Description
Technical field
The present invention relates to highly selective, high common mode inhibition and compact-sized second order balance bandpass filters, belong to filtering
Device technical field.
Background technology
In modern wireless communication systems, balancing device is of increased attention, because balancing device can have
Effect inhibits the noise of ambient noise and internal system.And wave filter is the essential device of communication system equipment.Balance band logical
Wave filter can effectively inhibit environment and the noise of internal system generation, thus be widely used in modern wireless communications circuits.It is high
Selectively, it minimizes, the Novel balance bandpass filter of high common mode inhibition is the active demand in market and balance bandpass filtering
The inexorable trend of device development.
Higher common mode inhibition can be realized using magnetic coupling, and differential-mode response will not be significantly affected.In order to further
The performance of bandpass filter is improved, coupling is become with the frequency that frequency linearity changes using coupling between resonator, so as in adjacent resonance
Programmable transmission zero is generated between device.Coupled wave theory is become according to frequency, by adjusting the first resonator and the second resonator
It is parallel to the distance between longer microstrip line of XX ' axis and electrical length and feeder line is connected to position in open circuit minor matters, it can be with
A zero is generated in upper stopband, two zeros are generated in lower stopband, and it is controlled to be located proximate to or far from passband, it is real
Existing highly selective and high out-of-side rejection ability.Under differential mode excitation, the first resonator and the second resonance in bandpass filter are balanced
Between device based on magnetic coupling, common-mode signal can be effectively inhibited.
Invention content
Above-mentioned in order to solve the problems, such as, the invention discloses highly selective, high common mode inhibition and compact-sized two
Rank balances bandpass filter, and specific technical solution is as follows：
Highly selective, high common mode inhibition and compact-sized second order balance bandpass filter, which is laid in
Printed circuit board surface, the printed circuit board, including dielectric-slab, the upper surface of the dielectric-slab is coated with substrate upper strata metal
Layer, the lower surface of the dielectric-slab are coated with substrate lower metal layer, set the center line of the length direction of substrate upper metal layers
For XX ' axis, the center line of width direction of substrate upper metal layers is set as YY ' axis,
The substrate upper metal layers are provided with the first resonator and the second resonator, first resonator along XX ' axial symmetry
With the second resonator along YY ' axial symmetry, the first resonator and the second resonator are split-ring resonator, and open-end,
The both ends of first resonator are provided with the first feeder line and third feeder line, the first feeder line connection along YY ' axial symmetry
There are the first open circuit minor matters, the third feeder line is connected with third open circuit minor matters,
The both ends of second resonator are provided with the second feeder line and the 4th feeder line, the second feeder line connection along YY ' axial symmetry
There are the second open circuit minor matters, the 4th feeder line is connected with the 4th open circuit minor matters,
Positioned at first feeder line of YY ' axis side, the second feeder line, the first open circuit minor matters, the second open circuit minor matters, the first resonator
The first bandpass filter is formed with the second resonator；The third feeder line, the 4th feeder line, third positioned at YY ' axis opposite sides are opened
Road minor matters, the 4th open circuit minor matters, the first resonator and the second resonator form the second bandpass filter；First bandpass filter and
Second bandpass filter is about YY ' axial symmetry, composition second order balance bandpass filter.
The length of first resonator and the second resonator is long for the corresponding electromagnetic wavelength of working frequency of wave filter
The half of degree, under differential mode excitation, there are magnetic couplings between the first resonator and the second resonator, utilize the magnetic coupling knot
Structure generates a controllable transmission zero.
The interlude of first resonator is parallel with XX ' axis, is put down after the both ends right-angled bend in the same direction of interlude with YY ' axis
Right-angled bend is opposite again after row extension extends, and there are spacing between two free ends, form hatch frame；Second resonance
The structure of device and the structure of the first resonator are about XX ' axis mirror images.
It is described first open circuit minor matters, second open circuit minor matters, third open circuit minor matters, the 4th open circuit minor matters at a right angle turning knot
Structure, and it is parallel on the outside of the turning of corresponding first resonator and the second resonator respectively；
Parallel with XX ' axis the first open circuit minor matters, the second open circuit minor matters, third open circuit minor matters, the 4th open circuit minor matters length ratio
The corresponding length for being parallel to XX ' shaft parts of first resonator and the second resonator is short.
First feeder line includes two rectangular microstrips, a triangle shaped microstrip and a trapezoidal micro-strip, one of square
Shaped microstrip is parallel with YY ' axis, and one end extends to the edge of dielectric-slab, and the other end is connected another by the right-angled bend of triangle shaped microstrip
One rectangular microstrip, the rectangular microstrip is parallel with XX ' axis, and concordant in the interlude of the first feeder line, and end passes through trapezoidal micro-
Band is connected perpendicularly to the first open circuit minor matters close to one end side of XX ' axis.
The equivalent width of two rectangular microstrips, trapezoidal micro-strip be isosceles trapezoid micro-strip, the bottom of isosceles trapezoid micro-strip
The equivalent width of length and rectangular microstrip, the triangle shaped microstrip be isoceles triangle shaped microstrip, the base of isoceles triangle shaped microstrip
With the equivalent width of rectangular microstrip.
The structure of the structure of first feeder line and the structure of the second feeder line, the structure of third feeder line and the 4th feeder line about
The structure of XX ' axis mirror images, the structure of first feeder line and the structure of third feeder line, the structure of the second feeder line and the 4th feeder line is closed
In YY ' axis mirror images.
The characteristic impedance of first feeder line, the second feeder line, third feeder line, the 4th feeder line is 50 ohm.
The present invention operation principle be：
In the present invention, the frequency between the first resonator, the second resonator becomes coupling and generates a controllable zero, improves filtering
The selectivity of device；First feeder line is coupled with the frequency being parallel between the rectangular microstrip part of the XX ' change of the second feeder line and third is presented
Line couples with the frequency being parallel between the rectangular microstrip part of the XX ' change of the 4th feeder line and generates a controllable zero；Source is with bearing
It carries coupling and forms crossedpath one zero of generation.Using the magnetic coupling between the first resonator, the second resonator, height is realized
Common mode inhibition.
The beneficial effects of the invention are as follows：
The present invention has highly selective and high common mode inhibition capacity.Under differential mode excitation, second order balance bandpass filter can wait
The bandpass filter for terminal short circuit is imitated, the transmission zero generated by frequency change coupling can be used to realize highly selective；Feedback
Cable architecture can be become with the frequency between generating source-load to be coupled, and is generated another controllable transmission zero, is improved Out-of-band rejection energy
Power；Source couples to form crossedpath one zero of generation with load.
Under common mode excitation, second order balance bandpass filter can be equivalent to the bandpass filter of open-end, make common mode
Signal can not be transmitted in difference mode signal near pass-band, so as to fulfill high common mode inhibition, meet the actual demand of communication system.
Description of the drawings
Fig. 1 is the schematic diagram of printed circuit board of the present invention；
Fig. 2 is the structure diagram of the present invention；
Fig. 3 is bandpass filter equivalent circuit diagram of the present invention under common-mode signal excitation；
Fig. 4 is bandpass filter equivalent circuit diagram of the present invention under difference mode signal excitation；（It emulates using HFSS softwares,
Test is using Agilent Network Analyzers N5230C）
Fig. 5 is scattering parameter emulation and the test result of the present invention；
Reference numeral title is as follows：
A1：First feeder line；A2：Second feeder line；A3：Third feeder line；A4：4th feeder line；
B1：First open circuit minor matters；B2：Second open circuit minor matters；B3：Third open circuit minor matters；B4：4th open circuit minor matters；
C1：First resonator；C2：Second resonator；
S1：Dielectric-slab；S2：Substrate upper metal layers；S3：Substrate lower metal layer；
port1：First port；port2：Second port；port1’：Third port；port2’：4th port.
Specific embodiment
With reference to the accompanying drawings and detailed description, the present invention is furture elucidated.It should be understood that following specific embodiments are only
For illustrating the present invention rather than limiting the scope of the invention.
Fig. 1 is the structure diagram of the present invention,
With reference to attached drawing as it can be seen that the balance bandpass filter of this high common mode inhibition, the balance bandpass filter are laid in printed circuit
Plate surface, the printed circuit board include dielectric-slab, and the upper surface of the dielectric-slab is coated with substrate upper metal layers, the medium
The lower surface of plate is coated with substrate lower metal layer, sets the center line of length direction of substrate upper metal layers as XX ' axis, setting
The center line of the width direction of substrate upper metal layers is YY ' axis.Structure of the invention arrangement relative position for convenience of description,
Set XX ' axis and YY ' axis.
The substrate upper metal layers are provided with the first resonator and the second resonator along XX ' axial symmetry, and described first is humorous
Device and the second resonator shake along YY ' axial symmetry, the first resonator and the second resonator are split-ring resonator, and terminal is opened
Road.
The both ends of first resonator are provided with the first feeder line and third feeder line, first feeder line along YY ' axial symmetry
The first open circuit minor matters are connected with, the third feeder line is connected with third open circuit minor matters.
The both ends of second resonator are provided with the second feeder line and the 4th feeder line, second feeder line along YY ' axial symmetry
The second open circuit minor matters are connected with, the 4th feeder line is connected with the 4th open circuit minor matters.
Positioned at first feeder line of YY ' axis side, the second feeder line, the first open circuit minor matters, the second open circuit minor matters, first humorous
Shake device and the second resonator the first bandpass filter of composition；Positioned at the third feeder line of YY ' axis opposite sides, the 4th feeder line,
Three open circuit minor matters, the 4th open circuit minor matters, the first resonator and the second resonator form the second bandpass filter；First bandpass filtering
Device and the second bandpass filter are about YY ' axial symmetry, composition second order balance bandpass filter.
The length of first resonator and the second resonator is long for the corresponding electromagnetic wavelength of working frequency of wave filter
The half of degree, under differential mode excitation, there are magnetic couplings between the first resonator and the second resonator, utilize the magnetic coupling knot
Structure generates a controllable transmission zero.
The interlude of first resonator is parallel with XX ' axis, is put down after the both ends right-angled bend in the same direction of interlude with YY ' axis
Right-angled bend is opposite again after row extension extends, and there are spacing between two free ends, form hatch frame；Second resonance
The structure of device and the structure of the first resonator are about XX ' axis mirror images.It is right-angle structure, with the holding pair of first or second resonator
Together.
It is described first open circuit minor matters, second open circuit minor matters, third open circuit minor matters, the 4th open circuit minor matters at a right angle turning knot
Structure, and it is parallel on the outside of the turning of corresponding first resonator and the second resonator respectively；
Parallel with XX ' axis the first open circuit minor matters, the second open circuit minor matters, third open circuit minor matters, the 4th open circuit minor matters length ratio
The corresponding length for being parallel to XX ' shaft parts of first resonator and the second resonator is short.
First feeder line includes two rectangular microstrips, a triangle shaped microstrip and a trapezoidal micro-strip, one of square
Shaped microstrip is parallel with YY ' axis, and one end extends to the edge of dielectric-slab, and the other end is connected another by the right-angled bend of triangle shaped microstrip
One rectangular microstrip, the rectangular microstrip is parallel with XX ' axis, and concordant in the interlude of the first feeder line, and end passes through trapezoidal micro-
Band is connected perpendicularly to the first open circuit minor matters close to one end side of XX ' axis.
The equivalent width of two rectangular microstrips, trapezoidal micro-strip be isosceles trapezoid micro-strip, the bottom of isosceles trapezoid micro-strip
The equivalent width of length and rectangular microstrip, the triangle shaped microstrip be isoceles triangle shaped microstrip, the base of isoceles triangle shaped microstrip
With the equivalent width of rectangular microstrip.
The structure of the structure of first feeder line and the structure of the second feeder line, the structure of third feeder line and the 4th feeder line about
The structure of XX ' axis mirror images, the structure of first feeder line and the structure of third feeder line, the structure of the second feeder line and the 4th feeder line is closed
In YY ' axis mirror images.
The characteristic impedance of first feeder line, the second feeder line, third feeder line, the 4th feeder line is 50 ohm.
The present invention can introduce frequency under common mode excitation, by magnetic coupling open-loop resonator and become coupling, so as to attached in passband
Closely generate a transmission zero, while the high common mode inhibition that basic holding is intrinsic.
Source-load that the present invention can be become by changing input/output structure to generate frequency couples, to generate two volumes
Outer differential mode transmission zero.
Concrete example illustrates the present invention below：
This balance bandpass filter is operated in be illustrated so that centre frequency is the wlan system of 2.4GHz as an example.In 1GHz ~ 11.5GHz
It is interior, by adjusting the coupling distance between the first resonator, the size of the second resonator and two resonators, the balance bandpass filtering
Device can be operated in different centre frequencies.
4 ports of micro-strip of the present invention balance bandpass filter tested using SMA welding, to access or
It is connected with circuit.
The present invention use relative dielectric constant as 2.2, RT/Duroid 5880 conduct medium base of the thickness for 0.508mm
Plate can also use the microwave board of other specifications as substrate.As shown in Figure 1, in the dielectric-slab S1 of RT/Duroid 5880
Upper and lower surface be respectively coated by substrate upper metal layers S2 and substrate lower metal layer S3.
Fig. 2 is the schematic top plan view of wave filter of the present invention.Figure median filter is by two resonators, four open circuit minor matters and four
A feeder line composition.First resonator C1 is split ring microstrip line, about YY ' axial symmetry, wherein being parallel to the longer micro- of XX ' axis
Width with line on YY ' directions is 0.5mm, and the length on XX ' directions is 20.6mm, and the distance with XX ' axis is 0.9mm,
About YY ' axial symmetry；Being parallel to shorter two microstrip line of XX ' axis, the width on YY ' directions is 0.5mm respectively, in XX '
Length on direction is 7mm, and the distance with XX axis is 5.9mm, and the distance with YY ' axis is 3.3mm, and two microstrip lines are about YY axis
Symmetrically；Width of two microstrip lines on XX ' directions perpendicular to XX ' axis is 0.5mm, and the length on YY ' directions is
5.5mm, the distance with XX ' axis are 0.9mm, and the distance with YY ' axis is 10.3mm.Second resonator C2 and the first resonator about
XX ' axial symmetry.First open circuit minor matters B1 is right-angle structure, and microstrip line two parts are respectively at XX ' axis and YY ' axial symmetry, wherein flat
The capable width in the microstrip line of XX ' axis on YY ' directions is 0.5mm, and the length on XX ' directions is 3.6mm, with XX ' axis
Distance is 6.5mm, and the distance with YY ' axis is 7.8mm；Width of the microstrip line of YY ' axis on XX ' directions is parallel to as 0.5mm,
Length on YY ' directions is 5.6mm, and the distance with XX ' axis is 0.9mm, and the distance with YY ' axis is 10.9mm.Second open circuit
The open circuits of minor matters B2 and first minor matters B1 is about XX ' axial symmetry.Third opens a way the open circuits of minor matters B3 and first minor matters B1 about YY ' axis pair
Claim.4th open circuit minor matters B4 and the second open circuit minor matters B2 are about YY ' axial symmetry.
The size of first resonator C1 and the second resonator C2 determine the resonant frequency of wave filter, between two resonators
Based on magnetic coupling, coupled wave theory is become according to frequency, by adjust the first resonator and the second resonator be parallel to XX ' axis compared with
The distance between long microstrip line and electrical length can generate a controllable transmission zero, realize the highly selective of wave filter；Source
It couples to form crossedpath one zero of generation with load；The micro- of XX ' axis is parallel to by adjusting the first feeder line and the second feeder line
The distance between band line, a controllable transmission zero can be generated in stopband, improves the Out-of-band rejection ability of wave filter.
Using the magnetic coupling between the first resonator C1 and the second resonator C2, high common mode inhibition is realized.
As shown in figure 3, equivalent circuit structure of the balance bandpass filter under common-mode signal excitation, at this time the first band logical filter
Wave device and the second bandpass filter are open circuit in connection, are thus equivalent to the bandpass filter of two both ends open circuits, with
Illustrate without loss of generality for first bandpass filter.Common-mode signal can not be transmitted under difference mode signal passband, thus reach
The effect of high common mode inhibition.
As shown in figure 4, equivalent circuit structure of first bandpass filter under difference mode signal excitation, at this time the first band logical filter
Wave device and the second bandpass filter are short circuit in connection, are thus equivalent to the bandpass filter of two number of terminals short circuit,
Illustrate without loss of generality by taking the first bandpass filter as an example.Pass through the spacing of the first and second resonators of adjusting, coupling part at this time
The length of microstrip line, feeder line is divided to be connected to the length of the position opened a way in minor matters and minor matters each section of opening a way, can be adjusted respectively
Electricity, magnetic coupling coefficient ratio and open circuit minor matters between resonator are located at the electrical length ratio on feeder line both sides, and then generate transmission zero
It puts and its position and number can be controlled simultaneously.
As shown in figure 5, scattering parameter emulation and the measured result of present invention balance microstrip bandpass filter.Wherein Sdd11Table
Show the transmission coefficient of the emulation under difference mode signal excitation, Sdd12The transmission coefficient of measurement under being encouraged for difference mode signal.Scc12It is common
The transmission coefficient of measurement under the excitation of mould signal.The passband mid-band frequency of the balance microstrip bandpass filter is 2.4GHz,
Its 3dB relative bandwidth is 4%, and emulation and measured result coincide well as we can see from the figure.Common mode is believed in difference mode signal passband
Number level is in -34dB hereinafter, with very high common mode inhibition effect.TZ1 is that the frequency between the first resonator, the second resonator becomes
Couple the controllable zero generated；TZ2 is that source couples the zero to form crossedpath generation with load；TZ3 be the first feeder line with
The frequency that is parallel between the rectangular microstrip part of XX ' of second feeder line becomes being parallel to for coupling and third feeder line and the 4th feeder line
Frequency between the rectangular microstrip part of XX ' becomes the controllable zero that coupling generates.As seen from the figure, wave filter has highly selective.
The technical means disclosed in the embodiments of the present invention is not limited to the technical means disclosed in the above technical means, and is further included
By more than technical characteristic arbitrarily the formed technical solution of combination.
Using above-mentioned desirable embodiment according to the present invention as enlightenment, by above-mentioned description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property range is not limited to the content on specification, it is necessary to determine its technical scope according to right.
Claims (8)
1. highly selective, high common mode inhibition and compact-sized second order balance bandpass filter, balance bandpass filter laying
In printed circuit board surface, the printed circuit board includes dielectric-slab, and the upper surface of the dielectric-slab is coated with substrate upper strata metal
Layer, the lower surface of the dielectric-slab are coated with substrate lower metal layer, set the center line of the length direction of substrate upper metal layers
For XX ' axis, the center line of width direction of substrate upper metal layers is set as YY ' axis,
It is characterized in that the substrate upper metal layers are provided with the first resonator and the second resonator along XX ' axial symmetry, it is described
Along YY ' axial symmetry, the first resonator and the second resonator are split-ring resonator for first resonator and the second resonator, and
Open-end,
The both ends of first resonator are provided with the first feeder line and third feeder line, the first feeder line connection along YY ' axial symmetry
There are the first open circuit minor matters, the third feeder line is connected with third open circuit minor matters,
The both ends of second resonator are provided with the second feeder line and the 4th feeder line, the second feeder line connection along YY ' axial symmetry
There are the second open circuit minor matters, the 4th feeder line is connected with the 4th open circuit minor matters,
Positioned at first feeder line of YY ' axis side, the second feeder line, the first open circuit minor matters, the second open circuit minor matters, the first resonator
The first bandpass filter is formed with the second resonator；The third feeder line, the 4th feeder line, third positioned at YY ' axis opposite sides are opened
Road minor matters, the 4th open circuit minor matters, the first resonator and the second resonator form the second bandpass filter；First bandpass filter and
Second bandpass filter is about YY ' axial symmetry, composition second order balance bandpass filter.
2. highly selective, high common mode inhibition according to claim 1 and compact-sized second order balance bandpass filter,
The length for being characterized in that first resonator and the second resonator is the corresponding electromagnetic wavelength of working frequency of wave filter
Half, under differential mode excitation, there are magnetic couplings between the first resonator and the second resonator, are produced using the magnetic coupling arrangement
A raw controllable transmission zero.
3. highly selective, high common mode inhibition according to claim 2 and compact-sized second order balance bandpass filter,
It is characterized in that the interlude of first resonator is parallel with XX ' axis, is put down after the both ends right-angled bend in the same direction of interlude with YY ' axis
Right-angled bend is opposite again after row extension extends, and there are spacing between two free ends, form hatch frame；Second resonance
The structure of device and the structure of the first resonator are about XX ' axis mirror images.
4. highly selective, high common mode inhibition according to claim 3 and compact-sized second order balance bandpass filter,
Be characterized in that it is described first open circuit minor matters, second open circuit minor matters, third open circuit minor matters, the 4th open circuit minor matters at a right angle turning knot
Structure, and it is parallel on the outside of the turning of corresponding first resonator and the second resonator respectively；
First open circuit minor matters, second open circuit minor matters, third open circuit minor matters, the 4th open circuit minor matters and XX ' axis parallel-segments length ratio
The corresponding length for being parallel to XX ' shaft parts of first resonator and the second resonator is short.
5. highly selective, high common mode inhibition according to claim 4 and compact-sized second order balance bandpass filter,
It is characterized in that first feeder line includes two rectangular microstrips, a triangle shaped microstrip and a trapezoidal micro-strip, one of square
Shaped microstrip is parallel with YY ' axis, and one end extends to the edge of dielectric-slab, and the other end is connected another by the right-angled bend of triangle shaped microstrip
One rectangular microstrip, the rectangular microstrip is parallel with XX ' axis, and concordant in the interlude of the first feeder line, and end passes through trapezoidal micro-
Band is connected perpendicularly to the first open circuit minor matters close to one end side of XX ' axis.
6. highly selective, high common mode inhibition according to claim 5 and compact-sized second order balance bandpass filter,
It is characterized in that the equivalent width of two rectangular microstrips, trapezoidal micro-strip is isosceles trapezoid micro-strip, the bottom of isosceles trapezoid micro-strip
The equivalent width of length and rectangular microstrip, the triangle shaped microstrip be isoceles triangle shaped microstrip, the base of isoceles triangle shaped microstrip
With the equivalent width of rectangular microstrip.
7. highly selective, high common mode inhibition according to claim 6 and compact-sized second order balance bandpass filter,
Be characterized in that the structure of the structure of first feeder line and the structure of the second feeder line, the structure of third feeder line and the 4th feeder line about
The structure of XX ' axis mirror images, the structure of first feeder line and the structure of third feeder line, the structure of the second feeder line and the 4th feeder line is closed
In YY ' axis mirror images.
8. highly selective, high common mode inhibition according to claim 7 and compact-sized second order balance bandpass filter,
The characteristic impedance for being characterized in that first feeder line, the second feeder line, third feeder line, the 4th feeder line is 50 ohm.
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| CN110867633A (en) * | 2019-10-30 | 2020-03-06 | 苏州灿勤通讯技术有限公司 | Novel filter |
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| 邓宏伟: "高性能平面微波滤波器及双工器的研究", 《中国博士学位论文全文数据库》 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109066023A (en) * | 2018-08-13 | 2018-12-21 | 上海健康医学院 | A kind of microstrip line low-pass filter based on open-loop resonator |
| CN109066023B (en) * | 2018-08-13 | 2024-02-13 | 上海健康医学院 | Microstrip low-pass filter based on open-loop resonator |
| CN110504514A (en) * | 2019-08-16 | 2019-11-26 | 南京智能高端装备产业研究院有限公司 | A kind of multilayer of integrated impedance mapping function is from encapsulating balance filter |
| CN110611145A (en) * | 2019-09-29 | 2019-12-24 | 南京航空航天大学 | HMSIW balance directional coupler |
| CN110611145B (en) * | 2019-09-29 | 2020-07-24 | 南京航空航天大学 | HMSIW balance directional coupler |
| CN110867633A (en) * | 2019-10-30 | 2020-03-06 | 苏州灿勤通讯技术有限公司 | Novel filter |
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Application publication date: 20180612 |