CN105958164B - Suspended stripline cross-coupling band pass filter - Google Patents
Suspended stripline cross-coupling band pass filter Download PDFInfo
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- CN105958164B CN105958164B CN201610472280.5A CN201610472280A CN105958164B CN 105958164 B CN105958164 B CN 105958164B CN 201610472280 A CN201610472280 A CN 201610472280A CN 105958164 B CN105958164 B CN 105958164B
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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 suspended stripline cross-coupling band pass filter, mainly solves the problems, such as that conventional filter cannot be realized simultaneously and reduce insertion loss and miniaturization.It includes rectangle exocoel (1), suspension medium substrate (2), Z-shaped incoming feeder (3), Z-shaped output feeder (4), rectangle suspended stripline resonator (5) and U-shaped cross-couplings line (6).Z-shaped input and output feeder line is made of three orthogonal microstrip lines, is respectively distributed to port and the both sides up and down of medium substrate；It is six grades identical that multistage rectangle suspended stripline resonator is set as structure, and every grade includes two panels rectangular patch and metallic vias, and rectangular patch is distributed in medium substrate upper and lower surface, is connected by metallic vias in open circuit one end；Every U-shaped cross-couplings line includes both sides minor matters and upside minor matters, is distributed between band line resonator.The present invention can reduce filter insertion loss and circuit size, realize the miniaturization of circuit, can be used for wireless communication system.
Description
Technical field
The invention belongs to suspended stripline device, more particularly to a kind of cross-coupling band pass filter can be used for wirelessly communicating
System radio frequency front end.
Background technology
In current practical application, multi-frequency in the departments such as radar, microwave communication, mobile communication, multi-channel operation are wanted
Ask more and more common, the requirement to crossover frequency is also higher and higher, so needing to use a large amount of microwave filter, especially band
Bandpass filter can all filter out the signal of passband both sides, can either limit high-power transmitter and be radiated in allocated frequency band,
It can be used for preventing receiver by the interference other than working band again in turn.In microwave and millimeter wave circuit, generally use is micro-
It is filtered the design of device with the transmission lines such as line and waveguide, there is disadvantage, quality factor, that is, Q values of microstrip line are relatively low, and
Waveguide volume is excessive, compared with transmission line described above, the shortcomings that suspended stripline not only overcomes them, and be integrated with more
More advantages, it is realized by the way that thin medium substrate to be suspended in metal cavity.It is identical as microstrip line, though suspended stripline
It is a kind of printed circuit board technology, but its much higher than microstrip line of Q values, it can be used for designing the various forms filter in broadband
Wave device, such as high pass, low pass, band logical, band resistance and multiplexer are not only suitable for ultra-wide since its impedance variations range is very wide
The making of band filter and multiplexer, and mutually tied with the parallel coupling line technology of interdigital structure, pectinate texture and half-wavelength
It closes, the filter of narrowband can be designed.It is higher than waveguide for the tolerance of cavity compared with the filter of waveguide type, because
The characteristic of dielectric-slab is mainly also to rely on for its filtering performance, so its volume is compared with being reduced.
Cross-couplings be filter non-adjacent resonators between form coupling to realizing definite transmission outside its passband
A kind of mode of zero, this mode make filter that can improve index in the case where not increasing exponent number, with less resonance
Unit realizes identical index, to meet the miniature requirement of Modern communications terminals.Meanwhile rationally adjustment cross-couplings filtering
The position of device out-of-band transmission zero, can not only improve Out-of-band rejection, can also improve the group delay characteristic in passband.Therefore,
Cross-coupled filter is realized technology and adjustment method by the higher and higher attention of lot of domestic and foreign scholar, comprehensive design
The hot spot studied at present filter.
2005, Wolfgang Menzel et al. were in the IEEE on Microwave Theory and Techniques phases
" Quasi-Lumped Suspended Stripline have been delivered on periodical (vol.53, NO.10, pp.3230-3237,2005)
Filters and Diplexers " propose a kind of new resonant element structure in this structure of suspended stripline, and design
A five ranks bandpass filter illustrates suspended stripline structure in terms of the low-loss and miniaturization of filter and duplexer
Superiority.But there is no introduce transmission zero to advanced optimize the Out-of-band rejection of filter, while band logical filter in the program
The insertion loss of wave device is 2.1dB.2015, Zhao-Xu Xu et al. were in IEEE on Electronics Letters periodicals
" Suspended Stripline Low-loss Bandpass have been delivered on (Vol.51No.25pp.2121-2123,2015)
Filter with Four Transmission Zeros ", it is proposed that there are four five rank bandpass filterings of transmission zero for a kind of band
Device, and intersect between realizing non-adjacent resonators using U-typed minor matters between first resonant cavity and the 5th resonant cavity
Stiffness of coupling it is controllable.But the program can actually realize that controllable transmission zero only has although with four transmission zeros
One, and only position is controllable, does not realize polar controllable；Simultaneously as the presence of U-typed minor matters makes the band logical
Occur an obvious burr phenomena between the passband of filter and controllable transmission zero, influences passband and with outer suppression
Characteristic processed.
Invention content
It is an object of the invention in view of the above shortcomings of the prior art, propose a kind of suspended stripline cross-couplings band logical filter
Wave device flexibly controls out-of-band transmission zero under conditions of the coupling between not influencing adjacent resonators, to reduce insertion loss
Position and polarity, while reducing the overall length of U-typed structure minor matters, and then eliminate the burr of structure generation, realize good
Good passband and Out-of-band rejection characteristic.
The present invention technical thought be：Pass through the length of U-typed structure minor matters and change between adjusting non-adjacent resonators
Make whether U-typed structure minor matters are grounded, flexibly controls position and the polarity of out-of-band transmission zero, and do not influence adjacent resonators
Between coupling, while eliminate the structure generation burr, realize good passband and Out-of-band rejection characteristic；Simultaneously by humorous
Shake cellular construction improvement to efficiently reduce the dielectric loss of resonant cavity, to further decrease the insertion loss of filter.
According to above-mentioned thinking, the present invention provides the following two kinds technical solution：
Technical solution 1：
A kind of suspended stripline cross-coupling band pass filter, including rectangular metal exocoel 1 suspend medium substrate 2, Z-shaped defeated
Enter feeder line 3, Z-shaped output feeder 4, multistage rectangle suspended stripline resonator 5 and a plurality of U-shaped cross-couplings line 6, it is characterised in that：
Z-shaped incoming feeder 3, Z-shaped output feeder 4 are made of three orthogonal microstrip lines, and Z-type incoming feeder 3
The avris of 2 upper surface of suspension medium substrate is overlayed on, Z-type output feeder 4 overlays on another avris of 2 lower surface of suspension medium substrate；
Multistage rectangle suspended stripline resonator 5, structure is identical, includes two panels per level-one rectangle suspended stripline resonator
Rectangular patch and metallic vias submit the upper and lower surface that finger-like is distributed in suspension medium substrate 2 between at different levels, and in rectangular patch
Open circuit one end connected by metallic vias；
A plurality of U-shaped cross-couplings line 6, to suspend medium substrate distribution in a center of symmetry, the U-shaped cross-couplings line of each is situated between
It is U-shaped by changing to generate cross-couplings between resonant cavity between the rectangle suspended stripline resonator at interval of level-one
Gap width of the cross-couplings line both ends apart from rectangle suspended stripline resonator controls the stiffness of coupling between non-adjacent resonators
With the relative position of transmission zero.
Preferably, the Z-shaped incoming feeder 3, Z-shaped output feeder 4 is made of three orthogonal microstrip lines,
I.e.：
First microstrip line of the two is port connection feeder line, the length of L0, width w0=w50Ω, w50ΩIt is 50 ohm
Micro belt line width；
The Article 2 microstrip line of the two is the coupling feed parallel with rectangle suspended stripline resonator, length L1Meet 0<
L1<(w/2-H-w0/ 2), wherein W is outer rectangular housing width, and H is the height that feeder line connects tap position at rectangle resonator,
Width is 1.4mm≤W1≤1.6mm；
The Article 3 microstrip line of the two is the coupling feed being vertically connected with rectangle suspended stripline resonator, the length of
4.5mm≤L4≤ 6.7mm, width 1.4mm≤W1≤1.6mm。
Preferably, every level-one in the multistage rectangle suspended stripline resonator (5), width is 9.9mm≤W2≤
10.1mm, length meetλgFor the wavelength in cavity, c is the light velocity in vacuum, εeIt is outstanding
Set the effective dielectric constant of medium substrate, f0For the resonant frequency of rectangle suspended stripline resonator.
Preferably, the transitory branch byte wide of the U-shaped cross-couplings line is 1mm≤W3≤ 1.5mm, length 7.85mm
≤L3≤ 16.35mm, both sides minor matters width are 1mm≤W4≤ 1.5mm, length are 1.9mm≤H1≤3.1mm。
The suspended stripline cross-coupling band pass filter, which is characterized in that U-shaped cross-couplings line-spacing both sides resonator
Gap width be 0.3mm≤G≤0.7mm.
Technical solution 2：
A kind of suspended stripline cross-coupling band pass filter, including rectangular metal exocoel 1 suspend medium substrate 2, Z-shaped defeated
Enter feeder line 3, Z-shaped output feeder 4, multistage rectangle suspended stripline resonator 5 and a plurality of U-shaped cross-couplings line 6, it is characterised in that：
Z-shaped incoming feeder 3, Z-shaped output feeder 4 are made of three orthogonal microstrip lines, and Z-type incoming feeder 3
The avris of 2 upper surface of suspension medium substrate is overlayed on, Z-type output feeder 4 overlays on another avris of 2 upper surface of suspension medium substrate；
Multistage rectangle suspended stripline resonator 5, structure is identical, includes two panels per level-one rectangle suspended stripline resonator
Rectangular patch and metallic vias form the upper following table that suspension medium substrate 2 is distributed in axially symmetric structure in mountain word between at different levels
Face, and connected by metallic vias in open circuit one end of rectangular patch；
A plurality of U-shaped cross-couplings line 6 is distributed in suspension medium substrate side to suspend medium substrate at axial symmetry, each
The U-shaped cross-couplings line of item is between the rectangle suspended stripline resonator at interval of level-one, to generate friendship between resonant cavity
Fork coupling, by changing gap width of the U-shaped cross-couplings line both ends apart from rectangle suspended stripline resonator, control is non-adjacent humorous
The relative position of the stiffness of coupling and transmission zero that shake between chamber.
The present invention has following technological merit：
1. the present invention is reduced the dielectric loss of transmission line, is improved the no-load Q of resonator using suspension air strip line structure
Value.
2. the present invention realizes two different cross-couplings forms using coupled structure between interdigitated or mountain font chamber,
Multiple definite transmission zeros are realized outside filter band, improve the Out-of-band rejection degree of filter.
3. length and position of the present invention by adjusting " u "-shaped coupling line, thus it is possible to vary the coupling between non-adjacent resonators
Intensity is closed, to the relative position of controlling transmission zero.
Description of the drawings
Fig. 1 is the three dimensional structure diagram of first embodiment of the invention；
Fig. 2 is the vertical view of Fig. 1；
Fig. 3 is the three dimensional structure diagram of second embodiment of the invention；
Fig. 4 is the vertical view of Fig. 3；
Fig. 5 is the frequency response curve of first embodiment of the invention；
Fig. 6 is the frequency response curve of second embodiment of the invention.
Specific implementation mode
It elaborates below in conjunction with the accompanying drawings to the embodiment of the present invention：
Embodiment 1：The suspended stripline cross-coupling band pass filter being centrosymmetric.
Referring to Figures 1 and 2, the present embodiment includes rectangle exocoel 1, suspends medium substrate 2, Z-shaped incoming feeder 3, Z-shaped output
Feeder line 4, multistage rectangle suspended stripline resonator 5 and a plurality of U-shaped cross-couplings line 6.Wherein：
The rectangle exocoel 1 is copper metal exocoel, wherein length L=135mm, width W=49.75mm are highly
10mm。
The suspension medium substrate 2, is suspended in the centre of rectangular cavities, uses dielectric constant for 2.55, thickness 1mm
Medium substrate；
The multistage rectangle suspended stripline resonator 5, shares six grades, but be not limited to six grades in this example.Per level-one square
Shape suspended stripline resonator includes two panels rectangular patch and metallic vias, this two panels rectangular patch is distributed in suspension medium substrate
One end of 2 upper and lower surface, two panels rectangular patch is placed in suspension medium substrate edge, is connected with rectangle exocoel, the other end passes through
Metallic vias is connected；Non- equidistant point in the upper and lower surface submission finger-like of suspension medium substrate of six grades of rectangle suspended stripline resonators
Cloth, whole to be centrosymmetric distribution by preceding three-level and rear three-level, wherein the first order and second level spacing are D1=9.49mm, second
Grade is D with third level spacing2=10.56mm, preceding three-level are D with rear three-level spacing3=10.53mm, metallic vias diameter D=
2mm.Length per level-one meets：In formula, λgFor the wavelength in cavity, c is in vacuum
The light velocity, εeFor the effective dielectric constant of the suspended stripline, f0For the resonant frequency of resonator, L2For the length of side of rectangle resonator, L2
=32.8mm；The width of rectangle resonator is W2=10mm.
The Z-shaped incoming feeder 3, Z-shaped output feeder 4 are made of three orthogonal microstrip lines, and first is end
Mouth connection feeder line, length L0=6mm, width W0=W50Ω=7.24mm, W50ΩFor 50 ohm microstrip line widths；Article 2 is
The coupling feed parallel with rectangle suspended stripline resonator, length meet 0<L1<(W/2-H-W0/ 2), this example takes L1=14mm,
Wherein W=49.75mm is outer rectangular housing width, and the height that coupling feed connects rectangle resonator tap position is H=
6.53mm, width W1=1.5mm；Article 3 is the feeder line being vertically connected with rectangle suspended stripline resonator, length L4=
4.68mm, width W1=1.5mm.
The a plurality of U-shaped cross-couplings line 6, totally two in this example, be centrosymmetric distribution, and first is located at first
Between grade rectangle suspended stripline resonator and third level rectangle suspended stripline resonator, Article 2 is located at fourth stage rectangle suspension band
Between line resonator and the 6th grade of rectangle suspended stripline resonator, for generating the cross-couplings between non-adjacent chamber, with the left side
For one, both sides minor matters one end is placed in suspension medium substrate edge, and the other end is connected with upside minor matters, is totally inverted U shape knot
Structure；It is L that its upside width, which is length,3=19.05mm, W3=1.5mm, both sides minor matters length are H1=3mm, width W4=
1mm, the gap width away from both sides resonator are G=0.5mm.
The frequency response curve of the present embodiment filter is as shown in figure 5, S in Fig. 521It is bent for the transmission characteristic of filter
Line, S11For the coverage diagram of filter.As shown in Figure 5, the centre frequency of passband is 1.95GHz, and relative bandwidth is
3.07%.The filter has lower insertion loss, preferable Out-of-band rejection characteristic and band-pass behavior, while realizing multiple
The position of transmission zero and polarity are controllable.
Embodiment 2：The suspended stripline cross-coupling band pass filter being centrosymmetric.
With reference to Fig. 3 and Fig. 4, the present embodiment includes rectangle exocoel 1, suspends medium substrate 2, Z-shaped incoming feeder 3, Z-shaped output
Feeder line 4, multistage rectangle suspended stripline resonator 5 and a plurality of U-shaped cross-couplings line 6.Wherein：
The rectangle exocoel 1 is same as Example 1.
The suspension medium substrate 2, it is same as Example 1.
The multistage rectangle suspended stripline resonator 5 shares six grades in this example, but is not limited to six grades.Per level-one rectangle
Suspended stripline resonator includes two panels rectangular patch and metallic vias, this two panels rectangular patch is distributed in suspension medium substrate 2
Upper and lower surface, one end of two panels rectangular patch is placed in suspension medium substrate edge, is connected with rectangle exocoel, the other end passes through gold
Belong to via to be connected；Six grades of rectangle suspended stripline resonators equidistantly divide in the upper and lower surface of suspension medium substrate in mountain font is non-
Cloth, whole to be axisymmetricly distributed by preceding three-level and rear three-level, wherein the first order and second level spacing are D1=9.19mm, the second level
It is D with third level spacing2=10.3mm, preceding three-level are D with rear three-level spacing3=2.87mm, metallic vias diameter D=2mm.Often
The length of level-one meets：In formula, λgFor the wavelength in cavity, c is the light velocity in vacuum, εe
For the effective dielectric constant of the suspended stripline, f0For the resonant frequency of resonator, L2For the length of side of rectangle resonator, L2=30mm；
The width of rectangle resonator is W2=10mm.
The Z-shaped incoming feeder 3, Z-shaped output feeder 4 are made of three orthogonal microstrip lines, and first is end
Mouth connection feeder line, length L0=6mm, width W0=W50Ω=7.24mm, W50ΩFor 50 ohm microstrip line widths；Article 2 is
The coupling feed parallel with rectangle suspended stripline resonator, length meet 0<L1<(W/2-H-W0/ 2), this example takes L1=
14.5mm, wherein W=49.75mm are outer rectangular housing width, and coupling feed connects the height of rectangle resonator tap position
For H=6.43mm, width W1=1.5mm；Article 3 is the feeder line being vertically connected with rectangle suspended stripline resonator, and length is
L4=6.57mm, width W1=1.5mm.
The a plurality of U-shaped cross-couplings line 6 is set as in this example but is not limited to two, is axisymmetricly distributed, first
Between first order rectangle suspended stripline resonator and third level rectangle suspended stripline resonator, Article 2 is located at fourth stage square
Between shape suspended stripline resonator and the 6th grade of rectangle suspended stripline resonator, for generating the intersection coupling between non-adjacent chamber
Close, by taking one, the left side as an example, downside minor matters are placed in suspension medium substrate edge, both sides minor matters both ends respectively with downside minor matters phase
Even, suspension medium substrate is stretched to, totally take the shape of the letter U structure；It is L that its upside width, which is length,3=18.49mm, W3=1mm, two side shoots
Section length is H1=1.94mm, width W4=1mm, the gap width away from both sides resonator are G=0.5mm.
The frequency response curve of the present embodiment filter is as shown in fig. 6, S in Fig. 621It is bent for the transmission characteristic of filter
Line, S11For the coverage diagram of filter.It will be appreciated from fig. 6 that the centre frequency of passband is 2.14GHz, relative bandwidth is
2.8%.The filter has lower insertion loss, preferable Out-of-band rejection characteristic and band-pass behavior, while realizing multiple
The position of transmission zero and polarity are controllable.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from the spirit and principles of the present invention made by changes, modifications, substitutions, combinations, simplifications,
Equivalent substitute mode is should be, is included within the scope of the present invention.
Claims (6)
1. a kind of suspended stripline cross-coupling band pass filter, including rectangular metal exocoel (1), suspension medium substrate (2) is Z-shaped
Incoming feeder (3), Z-shaped output feeder (4), multistage rectangle suspended stripline resonator (5) and a plurality of U-shaped cross-couplings line (6),
It is characterized in that：
Z-shaped incoming feeder (3), Z-shaped output feeder (4), is made of, and Z-type incoming feeder three orthogonal microstrip lines
(3) avris of suspension medium substrate (2) upper surface is overlayed on, Z-type output feeder (4) overlays on suspension medium substrate (2) lower surface
Another avris；
Multistage rectangle suspended stripline resonator (5), structure is identical, includes two panels square per level-one rectangle suspended stripline resonator
Shape patch and metallic vias, this two panels rectangular patch are distributed in the upper and lower surface of suspension medium substrate (2), two panels rectangular patch
One end is placed in suspension medium substrate edge, is connected with rectangle exocoel, and the other end is connected by metallic vias；Six grades of rectangles suspend band
Line resonator submits the non-equidistantly distributed of finger-like in the upper and lower surface of suspension medium substrate, during entirety is in by preceding three-level and rear three-level
The heart is symmetrical；
A plurality of U-shaped cross-couplings line (6), to suspend medium substrate distribution in a center of symmetry, the U-shaped cross-couplings line of each between
At interval of between the rectangle suspended stripline resonator of level-one, to generate cross-couplings between resonant cavity, pass through the U-shaped friendship of change
Pitch gap width of the coupling line both ends apart from rectangle suspended stripline resonator, control stiffness of coupling between non-adjacent resonators with
The relative position of transmission zero.
2. suspended stripline cross-coupling band pass filter according to claim 1, which is characterized in that Z-shaped incoming feeder
(3), Z-shaped output feeder (4) is made of three orthogonal microstrip lines, i.e.,：
First microstrip line of the two is port connection feeder line, the length of L0, width w0=w50Ω, w50ΩFor 50 ohm microstrips
Line width；
The Article 2 microstrip line of the two is the coupling feed parallel with rectangle suspended stripline resonator, length L1Meet 0<L1<
(w/2-H-w0/ 2), wherein W is outer rectangular housing width, and H is the height that feeder line connects tap position at rectangle resonator, wide
Degree is 1.4mm≤W1≤1.6mm；
The Article 3 microstrip line of the two is the coupling feed being vertically connected with rectangle suspended stripline resonator, the length of 4.5mm
≤L4≤ 6.7mm, width 1.4mm≤W1≤1.6mm。
3. suspended stripline cross-coupling band pass filter according to claim 1, which is characterized in that multistage rectangle suspends band
Every level-one in line resonator (5), width are 9.9mm≤W2≤ 10.1mm, length meetλgFor the wavelength in cavity, c is the light velocity in vacuum, εeFor the effective of suspension medium substrate
Dielectric constant, f0For the resonant frequency of rectangle suspended stripline resonator.
4. suspended stripline cross-coupling band pass filter according to claim 1, which is characterized in that U-shaped cross-couplings line
Transitory branch byte wide be 1mm≤W3≤ 1.5mm, length are 7.85mm≤L3≤ 16.35mm, both sides minor matters width are 1mm≤W4
≤ 1.5mm, length are 1.9mm≤H1≤3.1mm。
5. suspended stripline cross-coupling band pass filter according to claim 1, which is characterized in that U-shaped cross-couplings line
Gap width away from both sides resonator is 0.3mm≤G≤0.7mm.
6. a kind of suspended stripline cross-coupling band pass filter, including rectangular metal exocoel (1), suspension medium substrate (2) is Z-shaped
Incoming feeder (3), Z-shaped output feeder (4), multistage rectangle suspended stripline resonator (5) and a plurality of U-shaped cross-couplings line (6),
It is characterized in that：
Z-shaped incoming feeder (3), Z-shaped output feeder (4), is made of, and Z-type incoming feeder three orthogonal microstrip lines
(3) avris of suspension medium substrate (2) upper surface is overlayed on, Z-type output feeder (4) overlays on suspension medium substrate (2) upper surface
Another avris；
Multistage rectangle suspended stripline resonator (5), structure is identical, includes two panels square per level-one rectangle suspended stripline resonator
Shape patch and metallic vias, this two panels rectangular patch be distributed in suspension medium substrate 2 upper and lower surface, the one of two panels rectangular patch
End is placed in suspension medium substrate edge, is connected with rectangle exocoel, and the other end is connected by metallic vias；Six grades of rectangle suspended striplines
Resonator is in the non-equidistantly distributed of mountain font in the upper and lower surface of suspension medium substrate, and entirety is in axis pair by preceding three-level and rear three-level
Claim distribution；
A plurality of U-shaped cross-couplings line (6) is distributed in suspension medium substrate side, each U to suspend medium substrate at axial symmetry
Type cross-couplings line intersects coupling between the rectangle suspended stripline resonator at interval of level-one, to be generated between resonant cavity
It closes, by changing gap width of the U-shaped cross-couplings line both ends apart from rectangle suspended stripline resonator, controls non-adjacent resonators
Between stiffness of coupling and transmission zero relative position.
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| CN107046157B (en) * | 2017-01-22 | 2019-09-06 | 京信通信系统（中国）有限公司 | Suspended stripline bandstop filter and its communication cavity device |
| CN108428981A (en) * | 2018-02-12 | 2018-08-21 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Shield G line Terahertz surface wave filter |
| CN108987862A (en) * | 2018-07-20 | 2018-12-11 | 西安电子科技大学 | The miniaturization suspended stripline filter of high quality factor |
| CN108987865A (en) * | 2018-07-20 | 2018-12-11 | 西安电子科技大学 | Suspended stripline filter based on hybrid electromagnetic coupling |
| CN110600846A (en) * | 2019-08-30 | 2019-12-20 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Ultra-wideband band-pass filter with transmission zero |
| CN111224207B (en) * | 2020-01-13 | 2021-08-10 | 电子科技大学 | Broadband power divider |
| CN113922016A (en) * | 2020-07-09 | 2022-01-11 | 大富科技(安徽)股份有限公司 | Filter and communication equipment |
| CN112436251A (en) * | 2020-11-17 | 2021-03-02 | 常州仁千电气科技股份有限公司 | High-selectivity suspended strip line ultra-wideband filter |
| CN112467323B (en) * | 2020-11-27 | 2022-02-01 | 南宁国人射频通信有限公司 | Air suspension line dual-mode filter |
| CN115084807B (en) * | 2022-06-24 | 2024-02-20 | 广东通宇通讯股份有限公司 | Hybrid suspension linewidth band filter |
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| CN2702454Y (en) * | 2004-04-05 | 2005-05-25 | 海泰超导通讯科技（天津）有限公司 | Crossover coupling type filter for wireless communication |
| CN201838691U (en) * | 2010-06-08 | 2011-05-18 | 天津海泰超导电子有限公司 | Double passband high temperature superconducting filter |
| CN102509822A (en) * | 2011-10-26 | 2012-06-20 | 京信通信系统（中国）有限公司 | Double-band-pass microstrip filter |
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| CN105958164A (en) | 2016-09-21 |
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