CN107579317B - Balun bandpass filter based on the line of rabbet joint and micro-strip multimode resonator - Google Patents
Balun bandpass filter based on the line of rabbet joint and micro-strip multimode resonator Download PDFInfo
- Publication number
- CN107579317B CN107579317B CN201710695492.4A CN201710695492A CN107579317B CN 107579317 B CN107579317 B CN 107579317B CN 201710695492 A CN201710695492 A CN 201710695492A CN 107579317 B CN107579317 B CN 107579317B
- Authority
- CN
- China
- Prior art keywords
- line
- output
- feeder line
- rectangular enclosure
- feeder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The present invention discloses a kind of balun bandpass filter based on the line of rabbet joint and micro-strip multimode resonator, the Rectangular Enclosure with Participating Media substrate (7) of metal ground plate (8) is equipped with including lower surface, medium substrate (7) upper surface is equipped with input port feeder line (1), the first output port feeder line (2) and second output terminal mouth feeder line (3)；The input terminal of input port feeder line (1) is located at a narrow side midpoint of medium substrate (7), first output port feeder line (2) output end is located at (7) one broadside of medium substrate, and the output end of second output terminal mouth feeder line (3) is located at medium substrate (7) another broadside；It is equipped with short-circuit half wave resonator (4) and minor matters loaded type resonator (5) between input port feeder line (1) and the first output port feeder line (2), is etched with the continuous bending type half wavelength line of rabbet joint (6) on metal ground plate (8).Balun bandpass filter of the invention, selectivity is high, port match characteristic is good, phase deviation is small.
Description
Technical field
It is provided simultaneously with that structure is simple, selectivity is high, end the present invention relates to microwave passive component technical field, especially one kind
Mouthful matching properties are good, the small balun bandpass filter based on the line of rabbet joint and micro-strip multimode resonator of phase deviation.
Background technique
In recent years, modern wireless communication systems flourish, and increase to miniaturization, low cost, multifunction microwave device
Demand.Wherein, balun filter integrates signal filtering and balance is more with unbalanced signal conversion function as a kind of
Function element receives more and more attention.High performance balun filter can not only effectively reduce the size of system, and
The complexity of system design can be simplified, to further realize the low cost of wireless communication system, high-performance, miniaturization are set
Meter.
Document 1 (J.X.Xu and X.Y.Zhang, " Compact LTCC balun with bandpass response
based on marchand balun,”IEEE Microw Wireless Compon.Lett.,vol.26,no.7,
Pp.493-495, Jul.2016.) it is based on LTCC Technology (LTCC), one kind is devised using Marchand balun
The balun filter of miniaturization, however this technological design complexity is high, insertion loss is big.
Document 2 (G.-Q.Zhang, J.-X.Chen, J.Shi, H.Tang, H.Chu, and Z.-H.Bao, " Design of
multilayer balun filter with independently controllable dual passbands,”IEEE
Microw.Wireless Compon.Lett., vol.25, no.1, pp.10-12, Jan.2015.) it is based on multi-layer PCB technique,
Using cross slot patch resonator, devise a dual-passband can independent control balun filter, however the balun filter
Wave device it is general with interior matching properties effect.
Document 3 (J.P.Wang, F.Huang, L.Zhu, C.T.Cai, and W.Wu, " Study of a new planar-
type balun topology for application in the design of balun bandpass filters,”
IEEE Trans.Microw.Theory Techn., vol.43, no.24, pp.2824-2832, Sep.2016.) utilize two points
One of wavelength Field distribution characteristic devise two balun filter, but this two balun filter needs two or more
Multimode resonator forms filter response, undoubtedly increases design complexities.
In short, problem of the existing technology is: balun filter cannot be considered in terms of that structure is simple, selectivity is high, port
With the characteristic that performance is good and phase deviation is small, it is unfavorable for the popularization and application in modern wireless communication systems.
Summary of the invention
The purpose of the present invention is to provide a kind of the balun bandpass filter based on the line of rabbet joint and micro-strip multimode resonator, structure
Simply, selectivity is high, port match performance is good, phase deviation is small.
The technical solution for realizing the aim of the invention is as follows:
A kind of balun bandpass filter based on the line of rabbet joint and micro-strip multimode resonator, including lower surface are equipped with metal ground plate
Rectangular Enclosure with Participating Media substrate, the upper surface of the Rectangular Enclosure with Participating Media substrate be equipped with input port feeder line, the first output port feeder line and
The input terminal of second output terminal mouth feeder line, the input port feeder line is located among a narrow side of Rectangular Enclosure with Participating Media substrate, described
The output end of first output port feeder line is located at the output end position of a broadside of Rectangular Enclosure with Participating Media substrate, second output terminal mouth feeder line
In another broadside of Rectangular Enclosure with Participating Media substrate.Short circuit two is equipped between the input port feeder line and second output terminal mouth feeder line
/ mono- wave resonator and minor matters loaded type resonator, are etched with bending type half wavelength on the metal ground plate
The line of rabbet joint.
Compared with prior art, the present invention its remarkable advantage are as follows:
(1) structure is simple: the present invention can realize that easy to process integrated, production cost is low on single layer pcb board.
(2) equilibrium response is good: the present invention realizes the constant amplitude reverse phase of two output ports using the transition of microstrip line to the line of rabbet joint,
With stable amplitude difference and phase difference characteristics.
(3) selectivity is good: the present invention is ingenious to design balun bandpass filter using single multimode resonator, and selectivity is high,
Flexible design has a wide range of application.
(4) port match characteristic is good: the present invention is based in the balun bandpass filter band of the line of rabbet joint and micro-strip multimode resonator
Return loss is less than 20dB.
Present invention is further described in detail in the following with reference to the drawings and specific embodiments.
Detailed description of the invention
Fig. 1 is the schematic perspective view of the balun bandpass filter the present invention is based on the line of rabbet joint and micro-strip multimode resonator.
Fig. 2 is the top view of Fig. 1.
Fig. 3 is the structure size schematic diagram of embodiment 1.
Fig. 4 is the S parameter simulation curve figure of embodiment 1.
Fig. 5 is two output port phase differences of embodiment 1 and the simulation curve figure of amplitude difference.
In figure, input port feeder line 1, the first output port feeder line 2, second output terminal mouth feeder line 3, short-circuit half wave
Long resonator 4, minor matters loaded type resonator 5, the bending type half wavelength line of rabbet joint 6, Rectangular Enclosure with Participating Media substrate 7, metal ground plate
8,50 ohm microstrip conduction bands 11, quarter-wave coupling line 12, the first short-circuit column 41, the second short-circuit column 42, half
Wavelength transmission line 43, half wavelength open circuit resonators 51 load minor matters 52, forearm 61, middle arm 62, postbrachium 63.
Specific embodiment
In conjunction with shown in Fig. 1,2, a kind of balun bandpass filter based on the line of rabbet joint and micro-strip multimode resonator of the present invention, including
Lower surface is equipped with the Rectangular Enclosure with Participating Media substrate 7 of metal ground plate 8, is equipped with input port in the upper surface of the Rectangular Enclosure with Participating Media substrate 7
Feeder line 1, the first output port feeder line 2 and second output terminal mouth feeder line 3；The input terminal of the input port feeder line 1 is located at rectangle
One narrow side midpoint of medium substrate 7, the output end of the first output port feeder line 2 are located at one of Rectangular Enclosure with Participating Media substrate 7
The output end of broadside, the second output terminal mouth feeder line 3 is located at another broadside of Rectangular Enclosure with Participating Media substrate 7；In the input terminal
Short-circuit half wave resonator 4 and minor matters loaded type resonator 5 are equipped between mouth feeder line 1 and second output terminal mouth feeder line 3,
The continuous bending type half wavelength line of rabbet joint 6 is etched on the metal ground plate 8.
The input port feeder line 1 include 50 ohm microstrip conduction bands 11 and quarter-wave coupling line 12, described 50
The input terminal of ohm microstrip conduction band 11 is located at a narrow side midpoint of Rectangular Enclosure with Participating Media substrate 7, the 50 ohm microstrip conduction band
11 output end is connected with 12 one end of quarter-wave coupling line, the L-shaped quarter bend of the quarter-wave coupling line 12
A broadside of Rectangular Enclosure with Participating Media substrate 7 is directed toward in its free end after folding.
First output feeder 2 is 50 ohm microstrips of L-type right angle bending, the output of first output feeder 2
End, which is located at, to be directed toward on opposite 7 broadside of Rectangular Enclosure with Participating Media substrate with 12 free end of quarter-wave coupling line, first output
An arm where the output end of feeder line 2 is vertical with the broadside of Rectangular Enclosure with Participating Media substrate 7, and another arm of the first output feeder 2 vertically refers to
To the narrow side of the Rectangular Enclosure with Participating Media substrate 7 where input port feeder line 1.
Second output feeder 3 is 50 ohm microstrips of L-type right angle bending, the output of second output feeder 3
End is located on 7 broadside of Rectangular Enclosure with Participating Media substrate identical with 12 free end of quarter-wave coupling line, second output feeder 3
Output end where an arm it is vertical with the broadside of Rectangular Enclosure with Participating Media substrate 7, another arm of the second output feeder 3 is perpendicularly oriented to 50
The opposite another narrow side of Rectangular Enclosure with Participating Media substrate 7 of the input terminal of ohm microstrip conduction band 11.
The continuous bending type half wavelength line of rabbet joint 6 includes forearm 61, middle arm 62 and the postbrachium being successively vertically connected
63, the narrow side median perpendicular of the middle arm 62 and metal ground plate 8, and the midpoint of middle arm 62 is located in 8 narrow side of metal ground plate
On line, the forearm 61 is centrosymmetric with postbrachium 63 about middle 62 midpoint of arm.
The middle arm of first output feeder 2 and the second output feeder 3 about the continuous bending type half wavelength line of rabbet joint 6
Projection of 62 midpoints in 7 upper surface of Rectangular Enclosure with Participating Media substrate is in a center of symmetry.
The short circuit half wave resonator 4 includes the half wavelength transmission in the bending of non-closed annular right angle
Line 43, described 43 one end of half wavelength transmission line are located on the narrow side middle line of medium substrate 7, and pass through the first short-circuit column 41
It is connected across medium substrate 7 with metal ground plate 8.
The other end of the half wavelength transmission line 43 passes through medium substrate 7 by the second short-circuit column 42 and connects with metal
Floor 8 is connected.
The first short-circuit column 41 close to middle arm 62 close to 61 side of forearm, the forearm 61 be located at the first short-circuit column 41 with
Between second short-circuit column 42, the described first 41 lower end of short-circuit column is located on 8 narrow side middle line of metal ground plate.
The minor matters loaded type resonator 5 includes half wavelength open circuit resonators 51 and loads minor matters 52, described to add
Carry the center that minor matters 52 load on half wavelength open circuit resonators 51,51 both ends of half wavelength open circuit resonators
Respectively with 12 parallel coupling of quarter-wave coupling line of short-circuit half wave resonator 4 and input port feeder line 1, institute
State open end the first output port feeder line 2 of direction of half wavelength open circuit resonators 51.
The present invention is based in the balun bandpass filter of the line of rabbet joint and micro-strip multimode resonator, minor matters load the surprise of resonator 5
Even mould resonance frequency determines the position of two resonance poles in passband, wherein the length of two/wavelength open circuit resonators 51
Determine the position of odd mould resonance frequency, the length of load minor matters 52 can be with the position of independent control idol mould resonance frequency.Two points
One of 51 both ends of wavelength open circuit resonators and short-circuit half wave resonator 4 and input port feeder line 1 quarter-wave
Spacing and line width between long coupling line 12 determine stiffness of coupling.One or two output port 2,3 and bending type half
The adjustable impedance matching in the orthogonal position of the wavelength line of rabbet joint 6.In addition, signal is entered by input port feeder line is coupled to minor matters load
Resonance on resonator is exported by the coupling of half short-circuit resonant device, is transitioned into the line of rabbet joint on metal ground plate, due to
Electric field reverse phase distribution in line of rabbet joint both sides is extracted both sides signal and is exported by output port feeder line, respectively to obtain the defeated of constant amplitude reverse phase
Signal out.
The present invention is carried out in manufacture by metal covering of the printed-circuit board manufacturing technology to circuit substrate front and the back side
Processing corrosion can be realized, production cost is low so that the metal pattern needed for being formed, compact-sized on monolithic pcb board.Meanwhile
Using the reversed nature of line of rabbet joint both sides field distribution, there are stable phase difference characteristics, filtering is constructed using multimode resonator and is rung
It answers, there is wide working band and good frequency selectivity.Since the present invention is based on bars of the line of rabbet joint and micro-strip multimode resonator
Human relations bandpass filter structures are simple, selectivity is high, port match performance is good, phase deviation is small, are suitable for Modern wireless communication system
System.
Below with reference to embodiment, present invention is further described in detail.
Embodiment 1
The stereochemical structure of balun bandpass filter based on the line of rabbet joint and micro-strip multimode resonator as shown in Figure 1, top view such as
Shown in Fig. 2, related dimensions is as shown in Figure 3.The relative dielectric constant of used medium substrate 7 is 3.55, with a thickness of
0.508mm, loss angle tangent 0.0027.In conjunction with Fig. 3, each dimensional parameters of balun bandpass filter are as follows: Wp=1.18mm, Wm1
=0.6mm, Wm2=1.2mm, Wd=1.18mm, Ws=0.2mm, Lp1=6mm, Lp2=13.68mm, Lp3=11mm, Lp4=
1.4mm, Lm1=1.6mm, Lm2=13.4mm, Lm3=2.15mm, Lm4=13.5mm, Lm5=9.4mm, Lm6=2mm, Ls1=
11.8mm Ls2=3.92mm, Ls3=8.6mm, g=0.1mm.Balun bandpass filter includes the total of 50 ohm microstrip conduction bands
Area is 33.6 × 34mm2, corresponding guide wavelength is having a size of 0.52 λg×0.53λg, wherein λgIt is corresponding for passband central frequency
Guide wavelength.
This example balun bandpass filter is the modeling and simulating in electromagnetic simulation software HFSS.13.0.Fig. 4 is this example
The S parameter analogous diagram of middle balun bandpass filter, it can be seen from the figure that the passband central frequency of the balun bandpass filter is
2.8GHz, 3-dB fractional bandwidth are 23.6%, are less than -22dB with interior return loss, insertion loss is better than 0.6dB.Have in passband
Two resonance poles, passband have a resonance zero point outside, so that the example balun filter has good frequency selectivity.
Fig. 5 is the phase difference and amplitude difference of two output ports of this example balun bandpass filter, it can be seen from the figure that
The output port phase difference of the example balun bandpass filter in operating frequency range is within 180 ± 3.5 °, amplitude difference
Within ± 0.2dB.
In conclusion the present invention is based on the balun bandpass filters of the line of rabbet joint and micro-strip multimode resonator, according to line of rabbet joint both sides
The characteristic of electric field reverse phase distribution realizes the steady of balun filter in conjunction with the transition structure of microstrip line to the line of rabbet joint, the line of rabbet joint to microstrip line
Fixed equilibrium response designs the balun bandpass filter with multimode response by being embedded in micro-strip multimode resonator.The balun
Bandpass filter is highly suitable for modern wireless communication systems.
Claims (1)
1. a kind of balun bandpass filter based on the line of rabbet joint and micro-strip multimode resonator, it is characterised in that:
The Rectangular Enclosure with Participating Media substrate (7) of metal ground plate (8) is equipped with including lower surface, in the upper table of the Rectangular Enclosure with Participating Media substrate (7)
Face is equipped with input port feeder line (1), the first output port feeder line (2) and second output terminal mouth feeder line (3)；
The input terminal of the input port feeder line (1) is located at a narrow side midpoint of Rectangular Enclosure with Participating Media substrate (7), first output
The output end of port feedline (2) is located at a broadside of Rectangular Enclosure with Participating Media substrate (7), the second output terminal mouth feeder line (3) it is defeated
Outlet is located at another broadside of Rectangular Enclosure with Participating Media substrate (7)；
Short-circuit half wave resonator is equipped between the input port feeder line (1) and second output terminal mouth feeder line (3)
(4) and minor matters loaded type resonator (5) continuous bending type half wavelength slot, is etched on the metal ground plate (8)
Line (6)；
The input port feeder line (1) includes 50 ohm microstrip conduction bands (11) and quarter-wave coupling line (12), described
The input terminal of 50 ohm microstrip conduction bands (11) is located at a narrow side midpoint of Rectangular Enclosure with Participating Media substrate (7), 50 ohm microstrip
The output end of line conduction band (11) is connected with quarter-wave coupling line (12) one end, the quarter-wave coupling line (12)
A broadside of Rectangular Enclosure with Participating Media substrate (7) is directed toward in its free end after L-shaped right angle bending；
First output feeder (2) is 50 ohm microstrips of L-type right angle bending, the output of first output feeder (2)
End, which is located at, to be directed toward on opposite Rectangular Enclosure with Participating Media substrate (7) broadside with quarter-wave coupling line (12) free end, and described first
An arm where the output end of output feeder (2) is vertical with the broadside of Rectangular Enclosure with Participating Media substrate (7), the first output feeder (2) it is another
One arm is perpendicularly oriented to the narrow side of the Rectangular Enclosure with Participating Media substrate (7) where input port feeder line (1)；
Second output feeder (3) is 50 ohm microstrips of L-type right angle bending, the output of second output feeder (3)
End is located on Rectangular Enclosure with Participating Media substrate (7) broadside identical with quarter-wave coupling line (12) free end, second output
An arm where the output end of feeder line (3) is vertical with the broadside of Rectangular Enclosure with Participating Media substrate (7), another arm of the second output feeder (3)
It is perpendicularly oriented to Rectangular Enclosure with Participating Media substrate (7) another narrow side opposite with the input terminal of 50 ohm microstrip conduction bands (11)；
The continuous bending type half wavelength line of rabbet joint (6) include the forearm (61) being successively vertically connected, middle arm (62) and after
Arm (63), the narrow side median perpendicular of the middle arm (62) and metal ground plate (8), and the midpoint of middle arm (62) is located at metallic ground
On plate (8) narrow side middle line, the forearm (61) is centrosymmetric with postbrachium (63) about middle arm (62) midpoint；
First output feeder (2) and the second output feeder (3) are about in the continuous bending type half wavelength line of rabbet joint (6)
Projection of arm (62) midpoint in Rectangular Enclosure with Participating Media substrate (7) upper surface is in a center of symmetry；
The short circuit half wave resonator (4) includes the half wavelength transmission line in the bending of non-closed annular right angle
(43), described half wavelength transmission line (43) one end is located on the narrow side middle line of medium substrate (7), and passes through the first short circuit
Column (41) passes through medium substrate (7) and is connected with metal ground plate (8)；
The other end of the half wavelength transmission line (43) passes through medium substrate (7) and metal by the second short-circuit column (42)
Earth plate (8) is connected；
For described first short-circuit column (41) close to middle arm (62) close to forearm (61) side, the forearm (61) is located at the first short-circuit column
(41) between the second short-circuit column (42), the described first short-circuit column (41) lower end is located on metal ground plate (8) narrow side middle line；
The minor matters loaded type resonator (5) includes half wavelength open circuit resonators (51) and loads minor matters (52), described
Load minor matters (52) loads on the center of half wavelength open circuit resonators (51), the half wavelength open circuit resonators
(51) the both ends quarter-wave coupling line with short-circuit half wave resonator (4) and input port feeder line (1) respectively
(12) parallel coupling, open end the first output port feeder line (2) of direction of the half wavelength open circuit resonators (51).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710695492.4A CN107579317B (en) | 2017-08-15 | 2017-08-15 | Balun bandpass filter based on the line of rabbet joint and micro-strip multimode resonator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710695492.4A CN107579317B (en) | 2017-08-15 | 2017-08-15 | Balun bandpass filter based on the line of rabbet joint and micro-strip multimode resonator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107579317A CN107579317A (en) | 2018-01-12 |
| CN107579317B true CN107579317B (en) | 2019-04-12 |
Family
ID=61034566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710695492.4A Expired - Fee Related CN107579317B (en) | 2017-08-15 | 2017-08-15 | Balun bandpass filter based on the line of rabbet joint and micro-strip multimode resonator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107579317B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108306082B (en) * | 2018-01-18 | 2019-11-12 | 广州瀚信通信科技股份有限公司 | A kind of filtering balun based on cavity |
| CN109411855B (en) * | 2018-06-27 | 2020-02-18 | 华南理工大学 | Cavity-based dual-frequency filtering balun |
| TR201903086A2 (en) * | 2019-02-28 | 2019-06-21 | Nevsehir Haci Bektas Veli Ueniversitesi Rektoerluegue | DOUBLE BAND MICROSTRIP BALLOON BAND PASS FILTER |
| CN112186342B (en) * | 2020-10-27 | 2022-05-03 | 南通大学 | Dual-polarized dual-band dielectric filter antenna |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105244582A (en) * | 2015-10-30 | 2016-01-13 | 南京理工大学 | Wideband balun based on microstrip line-slot structure |
| CN105304982A (en) * | 2015-11-20 | 2016-02-03 | 南京理工大学 | Tapped feed dual-mode Balun band-pass filter |
| CN106058391A (en) * | 2016-07-25 | 2016-10-26 | 华南理工大学 | Novel coupling network based planar CQ diplexer |
| CN106921014A (en) * | 2017-03-02 | 2017-07-04 | 南京理工大学 | A kind of high selectivity balun wave filter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI552521B (en) * | 2014-09-19 | 2016-10-01 | Univ Nat Taiwan | Electromagnetic Noise Filter and Its Equivalent Filter Circuit |
-
2017
- 2017-08-15 CN CN201710695492.4A patent/CN107579317B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105244582A (en) * | 2015-10-30 | 2016-01-13 | 南京理工大学 | Wideband balun based on microstrip line-slot structure |
| CN105304982A (en) * | 2015-11-20 | 2016-02-03 | 南京理工大学 | Tapped feed dual-mode Balun band-pass filter |
| CN106058391A (en) * | 2016-07-25 | 2016-10-26 | 华南理工大学 | Novel coupling network based planar CQ diplexer |
| CN106921014A (en) * | 2017-03-02 | 2017-07-04 | 南京理工大学 | A kind of high selectivity balun wave filter |
Non-Patent Citations (2)
| Title |
|---|
| Dual-Band Filtering Power Divider With High Selectivity and Good Isolation;Jianpeng Wang et al;《IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS》;20161005;第774-776页 |
| 一种新型宽带多模巴伦带通滤波器的设计;黄烽，等;《2015年全国微波毫米波会议论文集》;20150530;第875-878页 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107579317A (en) | 2018-01-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107579317B (en) | Balun bandpass filter based on the line of rabbet joint and micro-strip multimode resonator | |
| CN106299575B (en) | A kind of Compact type broadband work(filter-divider | |
| CN104241737B (en) | A kind of LTCC based on resonator coupling filters balun | |
| US11158924B2 (en) | LTCC wide stopband filtering balun based on discriminating coupling | |
| CN106972228B (en) | A kind of highly selective balun filter based on line of rabbet joint form | |
| CN106099268A (en) | A kind of broadband merit filter-divider | |
| US20010050599A1 (en) | Dielectric filter, antenna duplexer, and communications appliance | |
| CN106921014B (en) | A kind of highly selective balun filter | |
| US9780427B2 (en) | Bandpass filter and method of fabricating the same | |
| CN111613859B (en) | Cophasal power division filter based on slot line and microstrip | |
| CN111384534B (en) | Three-way band-pass power division filter | |
| CN109273807A (en) | A kind of novel four function filter-divider of high performance wideband | |
| CN109193087A (en) | A kind of novel four function filter-divider of high-performance dual-passband | |
| CN105826640B (en) | A kind of bimodulus balun bandpass filter based on multimode resonator | |
| WO2010044502A1 (en) | Dual band pass filter | |
| CN204205000U (en) | A kind of LTCC filtering Ba Lun based on resonator | |
| KR101252687B1 (en) | Low-pass filter using metameterial | |
| CN108682926A (en) | A kind of highly selective dual-passband work(filter-divider | |
| US20210210830A1 (en) | Band pass filter, communication device, and resonator | |
| CN108493534A (en) | A kind of four mould chip integrated waveguide broad-band filters | |
| CN110277616B (en) | Swastika-type dual-passband band-pass filter based on vertical folding miniaturization | |
| KR101569474B1 (en) | Dual bandpass filter using stepped-impedance open-Loop resonators including even mode load bar | |
| CN209747694U (en) | Low-pass filter with complementary split resonant ring and U-shaped groove defected ground | |
| CN108493529B (en) | Double frequency filter | |
| CN113451722B (en) | Three-passband power division filter based on microstrip coupling line |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190412 Termination date: 20200815 |