CN105762465A - Miniaturized ultra wide band filter with two-notch features - Google Patents
Miniaturized ultra wide band filter with two-notch features Download PDFInfo
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- CN105762465A CN105762465A CN201610213103.5A CN201610213103A CN105762465A CN 105762465 A CN105762465 A CN 105762465A CN 201610213103 A CN201610213103 A CN 201610213103A CN 105762465 A CN105762465 A CN 105762465A
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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
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20354—Non-comb or non-interdigital filters
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Abstract
The invention provides a miniaturized ultra wide band filter with two-notch features, which is composed of two input/output ports, a dielectric substrate, an upper-layer microstrip structure and a bottom metal grounding board of the dielectric substrate, wherein the upper-layer microstrip structure comprises two uniform transmission line units, two first parallel coupled feeder lines, a stepped impedance resonator, a loaded T-type stub and two bandstop units, each bandstop unit comprises an open-loop stepped impedance transmission line and a short circuit stub, and short circuit is realized via a metallized through hole; the bottom metal grounding board comprises a first defect unit, a second defect unit, a first metallized through hole, a second metallized through hole and a grounding metal unit; and the two input/output ports are respectively connected with the upper-layer microstrip structure and the bottom metal grounding board of the dielectric substrate. Through coupling the two bandstop units with the parallel coupled feeder lines respectively, notch features can be realized, and the filter of the invention has the advantages of compact structure, high frequency selectivity and the like.
Description
Technical field
The invention belongs to communication technical field, specifically one has double; two trap characteristic, it is possible to suppress WLAN (WLAN) to disturb signal and the compact ultra-wide band filter of satellite communication interference signal.
Background technology
Along with developing rapidly of wireless communication technology, the demand of information system is constantly promoted by people, and ultra broadband (UWB) technology is arisen at the historic moment as a kind of new wireless communication technology.2002, FCC (FCC) is formal released the communications band of 3.1GHz to 10.6GHz by the commercial license of super-broadband tech, and super-broadband tech moves towards civilian.Compared with other communication technologys, it is low that super-broadband tech has cost, and power consumption is little, and data transmission is fast, and safety advantages of higher becomes a study hotspot of the current communications field.Ultra-wide band filter is one of core component of ultra-wideband communication system, and its performance quality directly affects the quality of whole system.But, in plurality of communication systems and when depositing, also cover the frequency range of other wireless communication systems in the ultra wideband frequency that FCC is defined, such as WLAN (WLAN) frequency range of 5.8GHz, the satellite communication frequency range etc. of 8.0GHz.In order to avoid interfering between system, it is ensured that radio ultra wide band system is properly functioning, it is necessary to design a kind of miniature ultra wide band wave filter with trap characteristic.
The major design method realizing trap characteristic at present on ultra-wide band filter includes: 1. load open circuit minor matters structure, need the quarter-wave open circuit minor matters line that loading one saves or more piece length is required trap frequency on original wave filter, this method is simple to operation, but process technology requires height, and reflection loss ratio is more serious；2. asymmetric input export structure, asymmetric input output coupling line can introduce transmission zero, and then introduce trap, but structure be single, and the control freedom degree of notch location is less, be not a kind of general method for designing；3. coupling trap resonator structure, compares the method that first two introduces trap, and this method is easier to control position and the notch depth of trap, but too increases the size of wave filter.Therefore a kind of compact conformation of design, function admirable, the ultra-wide band filter that can effectively control trap frequency is still current issue.
Summary of the invention
Deficiency for above technology, it is proposed that a kind of method.Technical scheme is as follows: a kind of miniature ultra wide band wave filter with double; two trap characteristic, including input port, output port, medium substrate and be arranged at the underlying metal earth plate bottom medium substrate, its upper-layer micro-strip structure also including being arranged at described medium substrate top, wherein:
Described upper-layer micro-strip structure includes: the first uniform transmission line unit, the second uniform transmission line unit, the first parallel coupling feeder line, the second parallel coupling feeder line, step electric impedance resonator, the T-shaped minor matters of loading, the first band resistance unit and the second band resistance unit；Described the first uniform transmission line unit, the second uniform transmission line unit lay respectively at the two ends, left and right on medium substrate upper strata and are on same level line, described input port and the first uniform transmission line unit are connected, and output port and the second uniform transmission line unit are connected；The T-shaped minor matters of described loading include uniform transmission line, and uniform transmission line upper end connects with the centre position of transmission line, and uniform transmission line lower end loads on the centre position of step electric impedance resonator；Described first band resistance unit includes the first open loop ladder impedance transmission lines, the second short circuit minor matters and realizes short-circuit first plated-through hole and realize, second includes the second plated-through hole of the second open loop stepped impedance transmission line and the second short circuit minor matters and realization short circuit with resistance unit, first connects with the first parallel coupling feeder line in the way of slot-coupled with resistance unit, and second connects with the second parallel coupling feeder line in the way of slot-coupled with resistance unit.
Further, described first parallel coupling feeder line is arranged on medium substrate, its cross section is the rectangle of the right opening, and non-opening and the first uniform transmission line unit of the first parallel coupling feeder line connect, and opening connects with the transmission line of T-shaped minor matters in the way of slot-coupled；The rectangle that cross section is left side opening of the second parallel coupling feeder line, and be arranged in parallel in opposite directions with the opening of the first parallel coupling feeder line, the second non-opening of parallel coupling feeder line and the second uniform transmission line unit connect, and opening connects with the transmission line of T-shaped minor matters in the way of slot-coupled.
Further, described underlying metal earth plate structure includes: the first defective unit, the second defective unit, the first plated-through hole, the second plated-through hole and grounded metal unit；Described first defective unit, the second defective unit are the etching structures on grounded metal unit by etching liquid corrosion, thus forming air element, for medium substrate ingress of air；First defective unit is positioned at immediately below the first parallel coupling feeder line, the second defective unit is positioned at immediately below the second parallel coupling feeder line；Described first plated-through hole, the second plated-through hole, all connect upper-layer micro-strip structure and underlying metal earth plate as conductor；Input port is connected with grounded metal unit respectively with output port.
Further, described step electric impedance resonator includes three sections of transmission lines, centre is high-impedance transmission line, both sides are quarter-wave low impedance transmission line, the mid frequency 6.85GHz of described step electric impedance resonator, the low impedance transmission line on both sides lays respectively in the middle of the first parallel coupling feeder line and the second parallel coupling feeder line parallel lines, and is connected in slot-coupled mode.
Further, described first with resistance unit, the second mid frequency that resonant frequency is required stopband with resistance unit, and the first band resistance unit, the second band resistance unit produce trap characteristic by slot-coupled mode.
Further, described first band resistance unit produces resonant frequency, for f1=5.8GHz, WLAN frequency range 5.725-5.825GHz, it is f that the second band resistance unit produces resonant frequency2=8.04GHz, X-band satellite communication, produce trap characteristic in slot-coupled mode at 5.8GHz and 8.04GHz place by parallel coupling feeder line.
Further, the dielectric constant of described medium substrate is 2.2, and thickness is 0.508m, and described ultra-wide band filter is of a size of 16.7 × 8.5mm2。
Advantages of the present invention and having the beneficial effect that:
The present invention 1. uses T-shape minor matters to load resonator, five equally distributed modes of resonance can not only be produced in 3.1-106GHz, a transmission zero is respectively produced in passband both sides, and reduce the overall dimensions of wave filter, make performance in the band that designed ultra-wide band filter had, high selectivity and compact structure.
2. the design of wave filter can be separated by the design with the design with resistance unit, and the introducing with resistance unit need not change the structural parameters of original wave filter, and does not affect the performance of original wave filter except trap characteristic.
3. the structural design with resistance unit can be versatile and flexible, double; two trap characteristic can be realized and can also realize many trap functions, can adjusting trap frequency by the size regulated with resistance unit, the coupling space regulated between stopband unit and parallel coupled line adjusts notch depth.
4. changing circuit is micro-strip planar structure, and cost is low, it is easy to processing, compact conformation, it is easy to integrated with other circuit.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention provides preferred embodiment ultra-wide band filter overall.
Fig. 2 is the upper-layer micro-strip structure schematic diagram of ultra-wide band filter of the present invention.
Fig. 3 is the underlying metal ground structure schematic diagram of ultra-wide band filter of the present invention.
Description of reference numerals: 1, 2 for input output port, 11, 21 is 50 ohm of uniform transmission lines, 12, 13 is first module parallel coupled line, 22, 23 is second unit parallel coupled line, open loop stepped impedance transmission line 15, short-circuited transmission line 16 (realizing short circuit by metallization 17) is for realizing the first band resistance unit of trap, open loop stepped impedance transmission line 25, short-circuited transmission line 26 (realizing short circuit by metallization 27) is for realizing the second band resistance unit of trap, 3 is step electric impedance resonator, uniform transmission line 31, 32, 33, the 34 T-shape minor matters for loading, 4 is medium substrate, 14, 15 is defect ground unit, 5 is grounded metal unit.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1, the ultra-wide band filter of the present invention by input output port 1 and 2, medium substrate 4, the upper-layer micro-strip structure of medium substrate and the underlying metal earth plate of medium substrate form, described input output port have two, respectively first input output port 1, second input output port 2.
As in figure 2 it is shown, the upper-layer micro-strip structure of medium substrate includes: first uniform transmission line unit the 11, second uniform transmission line unit the 21, first parallel coupling feeder line 12 and the 13, second parallel coupling feeder line 22 and 23, step electric impedance resonator 3, T-shape minor matters the 31,32,33 and 34, the first band resistance unit 15,16 and 17 loaded and the second band resistance unit 25,26 and 27；First uniform transmission line unit the 11, second uniform transmission line unit 21 lays respectively at the two ends, left and right on substrate upper strata and is on same level line, first input output port 1 be connected with the first uniform transmission line unit 11, second input output port 2 be connected with the second uniform transmission line unit 21；First parallel coupling feeder line 12 and 13 and the second parallel coupling feeder line 22 and 23 are respectively in " right opening " shape and " left opening " shape and arrange in opposite directions with opening, the first non-opening of parallel coupling feeder line 12 and 13 and the first uniform transmission line unit 11 connect, opening transmission line 31 with T-shape minor matters in the way of slot-coupled connects, the second non-opening of parallel coupling feeder line 22 and 23 and the second uniform transmission line unit 21 connect, and opening transmission line 31 with T-shape minor matters in the way of slot-coupled connects；The T-shape minor matters loaded include uniform transmission line 31,32,33 and 34, and uniform transmission line 31 upper end connects with the centre position of transmission line 32, and lower end loads on step electric impedance resonator 3 centre position that mid frequency is 6.85GHz；First band resistance unit includes open loop ladder impedance transmission lines 15 and short circuit minor matters 16, and short circuit is realized by plated-through hole 17；Second band resistance unit includes open loop stepped impedance transmission line 25 and short circuit minor matters 26, and short circuit is realized by plated-through hole 27；First band resistance unit 15,16 and 17 and the second band resistance unit 25,26 and 27 are respectively in " right opening " shape and " left opening " shape and arrange in opposite directions with opening, first is positioned at the middle position of transmission line on the right of Fang Huan with resistance unit 15,16 and 17 opening, Opening length is 0.8mm, second middle position with resistance unit 25, the 26 and 27 opening side of being positioned at ring left side transmission line, Opening length is 0.8mm；First connects with the first parallel coupling feeder line 12 in the way of slot-coupled with resistance unit 15,16 and 17, and coupling gap is 0.19mm；Second connects with the second parallel coupling feeder line 22 in the way of slot-coupled with resistance unit 25,26 and 27；Coupling gap is 0.19mm；First band resistance unit 15,16 and 17 and the second band resistance unit 25,26 and 27 all produce two resonant frequencies, respectively f1=5.8GHzWLAN frequency range 5.725-5.825GHz, f2=8.04GHzX band satellite communicates, and produces trap characteristic in slot-coupled mode at 5.8GHz and 8.04GHz place by parallel coupling feeder line.The dielectric constant of medium substrate 4 is 2.2, and thickness is 0.508m, and filter size is 16.7 × 8.5mm2。
As it is shown on figure 3, underlying metal earth plate structure includes: the first defective unit the 14, second defective unit the 24, first plated-through hole the 17, second plated-through hole 27 and grounded metal unit 5；Described first defective unit the 14, second defective unit 24 is the rectangular configuration of etching on grounded metal unit 5, thus forming air element；First defective unit 14 is positioned at immediately below the first parallel coupling feeder line 12 and 13, the second defective unit 24 is positioned at immediately below the second parallel coupling feeder line 22 and 23；Described first plated-through hole the 17, second plated-through hole 27, all connects upper-layer micro-strip structure and underlying metal earth plate as conductor；First input output port 1 with second input output port 2 be connected with grounded metal unit 5 respectively.
The frequency characteristic of the present embodiment includes: S21Insertion loss parameter and S11Return wave loss parameter, group delay.Abscissa represents frequency variable, and unit is GHz, and left vertical coordinate represents amplitude variations, and unit is dB.Right vertical coordinate is group delay, and unit is ns.The ultra-wide band filter three dB bandwidth of the present invention is 3.0-10.8GHz, and two transmission zeros lay respectively at 2.4GHz and 11.5GHz, creates two trap bands in passband, and except trap band, in passband, group delay is less than 0.4ns.Wave filter is at the detail drawing of notch band, and the mid frequency of first trap band is at 5.8GHz, and decay minimum point reaches-27.49dB, and trap relative bandwidth is 5.8%；The mid frequency of second trap band is at 8.04GHz, and decay minimum point is in-18.83dB, trap relative bandwidth 4.3%.
In this example, two bands hinder unit about transmission line 31 centrosymmetry, each resonant frequency f all producing two with resistance unit1=5.8GHz, f2=8.04GHz, when producing different resonant frequencies with resistance unit for two, then can produce multiple corresponding trap characteristic.Regulating with the coupling space between resistance unit and coupling feed, thus it is possible to vary notch depth simultaneously, be specially coupling space more little, stiffness of coupling is more big, and trap is more deep.Therefore, it can according to the actual requirements, regulate band resistance unit size, produce required trap frequency.
The above embodiment is interpreted as being merely to illustrate the present invention rather than limiting the scope of the invention.After having read the content of record of the present invention, the present invention can be made various changes or modifications by technical staff, and these equivalence changes and modification fall into the scope of the claims in the present invention equally.
Claims (7)
1. a miniature ultra wide band wave filter with double; two trap characteristic, including input port (1), output port (2), medium substrate (4) and the underlying metal earth plate being arranged at medium substrate (4) bottom, it is characterized in that, also include the upper-layer micro-strip structure being arranged at described medium substrate (4) top, wherein:
Described upper-layer micro-strip structure includes: the first uniform transmission line unit (11), the second uniform transmission line unit (21), the first parallel coupling feeder line (12,13), the second parallel coupling feeder line (22,23), step electric impedance resonator (3), the T-shaped minor matters loaded, the first band resistance unit and the second band resistance unit；Described the first uniform transmission line unit (11), the second uniform transmission line unit (21) lay respectively at the two ends, left and right on medium substrate (4) upper strata and are on same level line, described input port (1) is connected with the first uniform transmission line unit (11), and output port (2) is connected with the second uniform transmission line unit (21)；The T-shaped minor matters of described loading include uniform transmission line, uniform transmission line (31) upper end connects with the centre position of transmission line (32), and uniform transmission line (31) lower end loads on the centre position of step electric impedance resonator (3)；Described first band resistance unit includes the first open loop ladder impedance transmission lines (15), the second short circuit minor matters (16) and realizes short-circuit first plated-through hole (17) and realize, second includes the second open loop stepped impedance transmission line (25) and the second short circuit minor matters (26) with hindering unit and realizes second plated-through hole (27) of short circuit, first connects with the first parallel coupling feeder line (12) in the way of slot-coupled with resistance unit, and second connects with the second parallel coupling feeder line (22) in the way of slot-coupled with resistance unit.
2. the miniature ultra wide band wave filter with double; two trap characteristic according to claim 1, it is characterized in that, described first parallel coupling feeder line (12,13) it is arranged on medium substrate (4), its cross section is the rectangle of the right opening, non-opening and the first uniform transmission line unit (11) of the first parallel coupling feeder line (12,13) connect, and opening transmission line (31) with T-shaped minor matters in the way of slot-coupled connects；Second parallel coupling feeder line (22,23) cross section is the rectangle of left side opening, and with the first parallel coupling feeder line (12,13) opening be arranged in parallel in opposite directions, second parallel coupling feeder line (22,23) non-opening and the second uniform transmission line unit (21) connect, and opening transmission line (31) with T-shaped minor matters in the way of slot-coupled connects.
3. the miniature ultra wide band wave filter with double; two trap characteristic according to claim 1 and 2, it is characterized in that, described underlying metal earth plate structure includes: the first defective unit (14), the second defective unit (24), the first plated-through hole (17), the second plated-through hole (27) and grounded metal unit (5)；Described first defective unit (14), the second defective unit (24) are the etching structures on grounded metal unit (5) by etching liquid corrosion, thus forming air element, for medium substrate ingress of air；First defective unit (14) is positioned at immediately below the first parallel coupling feeder line (12,13), the second defective unit (24) is positioned at immediately below the second parallel coupling feeder line (22,23)；Described first plated-through hole (17), the second plated-through hole (27), all connect upper-layer micro-strip structure and underlying metal earth plate as conductor；Input port (1) is connected with grounded metal unit (5) respectively with output port (2).
4. the miniature ultra wide band wave filter with double; two trap characteristic according to claim 3, it is characterized in that, described step electric impedance resonator (3) includes three sections of transmission lines, centre is high-impedance transmission line, both sides are quarter-wave low impedance transmission line, the mid frequency 6.85GHz of described step electric impedance resonator (3), the low impedance transmission line on both sides lays respectively at the first parallel coupling feeder line (12,13) and the second parallel coupling feeder line (22,23) in the middle of parallel lines, and it is connected in slot-coupled mode.
5. the miniature ultra wide band wave filter with double; two trap characteristic according to claim 4, it is characterized in that, described first with resistance unit, the second mid frequency that resonant frequency is required stopband with resistance unit, and the first band resistance unit, the second band resistance unit produce trap characteristic by slot-coupled mode.
6. the miniature ultra wide band wave filter with double; two trap characteristic according to claim 5, it is characterised in that described first band resistance unit produces resonant frequency, for f1=5.8GHz, WLAN frequency range 5.725-5.825GHz, it is f that the second band resistance unit produces resonant frequency2=8.04GHz, X-band satellite communication, produce trap characteristic in slot-coupled mode at 5.8GHz and 8.04GHz place by parallel coupling feeder line.
7. the miniature ultra wide band wave filter with double; two trap characteristic according to claim 1, it is characterised in that the dielectric constant of described medium substrate (4) is 2.2, and thickness is 0.508m, and described ultra-wide band filter is of a size of 16.7 × 8.5mm2。
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106169635A (en) * | 2016-08-13 | 2016-11-30 | 南京理工大学 | A kind of pocket super-broadband band filter with trap characteristic |
| CN106450605A (en) * | 2016-10-14 | 2017-02-22 | 厦门大学 | Diplexer based on short-circuit branch loaded type left and right handed composite resonators |
| CN106486723A (en) * | 2016-09-21 | 2017-03-08 | 南京理工大学 | Ultra-wide band filter based on microstrip line slot line structure |
| CN106785261A (en) * | 2017-01-09 | 2017-05-31 | 华东交通大学 | A kind of adjustable bandpass filter of arrowband trap |
| CN106887656A (en) * | 2017-03-08 | 2017-06-23 | 重庆邮电大学 | A kind of miniaturization Wide stop bands ultra-wide band filter with double trap characteristics |
| CN107069158A (en) * | 2017-01-09 | 2017-08-18 | 华东交通大学 | A kind of broadband band-pass filter with trap characteristic |
| CN107482291A (en) * | 2017-08-16 | 2017-12-15 | 电子科技大学 | A kind of new double-passband filter |
| CN109755701A (en) * | 2019-01-25 | 2019-05-14 | 西安石油大学 | The triple-band filter of three minor matters open circuit Stepped Impedance line load |
| CN110021803A (en) * | 2019-03-26 | 2019-07-16 | 西安理工大学 | There are three the ultra-wide band filters of trap frequency point for tool |
| CN110534853A (en) * | 2019-09-07 | 2019-12-03 | 西南交通大学 | A kind of multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator |
| CN111512547A (en) * | 2017-12-21 | 2020-08-07 | Rf360欧洲有限责任公司 | Hybrid filter |
| CN113611994A (en) * | 2021-08-17 | 2021-11-05 | 重庆邮电大学 | Coplanar waveguide dual-frequency band-pass filter based on various shape defected grounds |
| CN114566775A (en) * | 2022-03-07 | 2022-05-31 | 南京理工大学 | High-stopband rejection microstrip band-stop filter applied to satellite communication |
| CN117895200A (en) * | 2024-03-11 | 2024-04-16 | 成都核心智慧科技有限公司 | 5G substrate integrated coaxial filter based on extraction pole resonator |
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Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106169635B (en) * | 2016-08-13 | 2018-10-12 | 南京理工大学 | A kind of pocket super-broadband bandpass filter with trap characteristic |
| CN106169635A (en) * | 2016-08-13 | 2016-11-30 | 南京理工大学 | A kind of pocket super-broadband band filter with trap characteristic |
| CN106486723A (en) * | 2016-09-21 | 2017-03-08 | 南京理工大学 | Ultra-wide band filter based on microstrip line slot line structure |
| CN106486723B (en) * | 2016-09-21 | 2019-05-07 | 南京理工大学 | Based on microstrip line-slot line structure ultra-wide band filter |
| CN106450605A (en) * | 2016-10-14 | 2017-02-22 | 厦门大学 | Diplexer based on short-circuit branch loaded type left and right handed composite resonators |
| CN106450605B (en) * | 2016-10-14 | 2020-03-06 | 厦门大学 | Duplexer based on short-circuit branch loading type composite left-right-hand resonator |
| CN107069158B (en) * | 2017-01-09 | 2019-04-19 | 华东交通大学 | A kind of broadband band-pass filter with trap characteristic |
| CN107069158A (en) * | 2017-01-09 | 2017-08-18 | 华东交通大学 | A kind of broadband band-pass filter with trap characteristic |
| CN106785261B (en) * | 2017-01-09 | 2019-08-09 | 华东交通大学 | A kind of adjustable bandpass filter of narrowband trap |
| CN106785261A (en) * | 2017-01-09 | 2017-05-31 | 华东交通大学 | A kind of adjustable bandpass filter of arrowband trap |
| CN106887656A (en) * | 2017-03-08 | 2017-06-23 | 重庆邮电大学 | A kind of miniaturization Wide stop bands ultra-wide band filter with double trap characteristics |
| CN107482291A (en) * | 2017-08-16 | 2017-12-15 | 电子科技大学 | A kind of new double-passband filter |
| CN107482291B (en) * | 2017-08-16 | 2019-05-24 | 电子科技大学 | A kind of novel double-passband filter |
| CN111512547A (en) * | 2017-12-21 | 2020-08-07 | Rf360欧洲有限责任公司 | Hybrid filter |
| CN111512547B (en) * | 2017-12-21 | 2023-10-24 | Rf360新加坡私人有限公司 | Hybrid filter |
| CN109755701A (en) * | 2019-01-25 | 2019-05-14 | 西安石油大学 | The triple-band filter of three minor matters open circuit Stepped Impedance line load |
| CN110021803A (en) * | 2019-03-26 | 2019-07-16 | 西安理工大学 | There are three the ultra-wide band filters of trap frequency point for tool |
| CN110021803B (en) * | 2019-03-26 | 2020-12-18 | 西安理工大学 | Ultra-wideband filter with three trapped wave frequency points |
| CN110534853A (en) * | 2019-09-07 | 2019-12-03 | 西南交通大学 | A kind of multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator |
| CN113611994A (en) * | 2021-08-17 | 2021-11-05 | 重庆邮电大学 | Coplanar waveguide dual-frequency band-pass filter based on various shape defected grounds |
| CN114566775A (en) * | 2022-03-07 | 2022-05-31 | 南京理工大学 | High-stopband rejection microstrip band-stop filter applied to satellite communication |
| CN114566775B (en) * | 2022-03-07 | 2024-05-28 | 南京理工大学 | High-stop-band rejection microstrip band-stop filter applied to satellite communication |
| CN117895200A (en) * | 2024-03-11 | 2024-04-16 | 成都核心智慧科技有限公司 | 5G substrate integrated coaxial filter based on extraction pole resonator |
| CN117895200B (en) * | 2024-03-11 | 2024-06-04 | 成都核心智慧科技有限公司 | 5G substrate integrated coaxial filter based on extraction pole resonator |
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