CN104900947A - Micro-strip ultra wide band band-pass filter with marked frequency selection characteristic - Google Patents
Micro-strip ultra wide band band-pass filter with marked frequency selection characteristic Download PDFInfo
- Publication number
- CN104900947A CN104900947A CN201510257745.0A CN201510257745A CN104900947A CN 104900947 A CN104900947 A CN 104900947A CN 201510257745 A CN201510257745 A CN 201510257745A CN 104900947 A CN104900947 A CN 104900947A
- Authority
- CN
- China
- Prior art keywords
- transmission line
- line joint
- open circuited
- joint
- circuited transmission
- 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.)
- Granted
Links
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
An ultra wide band filter is a key element in an ultra wide band communication system, whose the performance thereof determines the whole performance of the system. The invention relates to an ultra wide band band-pass filter based on a novel multimode resonator. The filter is characterized in that an open circuit transmission line knot 31 and an open circuit transmission line knot 36 are respectively connected to two ends of a closed external circular ring 32; the closed external circuit ring 32 is connected with a closed internal circular ring 34 via a transmission line knot 33; the closed external circular ring 32 and the closed internal circular ring 34 share the same center of a circuit with different radiuses; and the transmission line knot 33 extends towards the center, i.e., an open circuit transmission line knot 35. Research shows that the filter is advantaged by high frequency selectivity and compact size.
Description
Technical field
The invention belongs to communication technical field, be specifically related to a kind of micro band superwide band band pass filter.
Background technology
In 2002, FCC (FCC) was by open for the frequency range between the 3.1GHz ~ 10.6GHz application for the communications field.Because advantages such as its high transfer rate and low transmission losses, ultra-wideband communications receives to be paid attention to widely and obtains swift and violent development.As the Primary Component in ultra-wideband communication system, the performance of ultra wide band bandpass filter determines the overall performance of system.But the ultra wide band bandpass filter of small design, high-performance and low cost is still a major challenge.
Summary of the invention
The object of the invention is to overcome existing ultra wide band bandpass filter not enough, providing a kind of micro band superwide band band pass filter.This filter has the advantages such as good band connection frequency selectivity, size are less, easy debugging.
The structure of model microstrip line as shown in Figure 1, mainly comprises three layers.Tier I is metal overlying strata, and tier II is dielectric substrate, and layer III is coating under metal.The structure of micro band superwide band band pass filter of the present invention as shown in Figure 2.As shown in Figure 3, the technical scheme adopted is in the front of filter: at the inner pattern etched as shown in Figure 3 of metal overlying strata (i.e. tier I) of microstrip line.It is characterized in that: open circuited transmission line joint 31 and open circuited transmission line joint 36 are connected respectively to closed outer toroid 32 two ends; Closed outer toroid 32 by a transmission line joint 33 with closed in annulus 34 be connected, closed outer toroid 32 and closed in annulus 34 there is the identical center of circle, just radius difference; Minor matters 33 extend to the center of circle, are open circuited transmission line joint 35.These parts form a multimode resonator.Incoming feeder 1 by a gradual change impedance transmission lines joint 10, then carries out input Energy Coupling by connected transmission line joint 11 and transmission line joint 12 with this multimode resonator.Output feeder 2 by a gradual change impedance transmission lines joint 20, then carries out Energy Coupling by connected transmission line joint 21 and transmission line joint 22 with this multimode resonator.In order to improve input resistant matching, be connected to short-circuited transmission line joint 13 (short circuit is realized by plated-through hole 14) and an open circuited transmission line joint 15 at incoming feeder 1 place.In order to improve output impedance coupling, be connected to short-circuited transmission line joint 23 (short circuit is realized by plated-through hole 24) and an open circuited transmission line joint 25 at output feeder 2 place.
The invention has the beneficial effects as follows: compared with existing filter, the resonator contained by filter of the present invention is a multimode resonator.The bandwidth of the filter formed can covering ultra wideband frequency range, and the frequency selectivity of passband is better, the advantages such as Out-of-band rejection better performances, size are less.
Accompanying drawing explanation
Fig. 1 is that the present invention is for processing the composite layer of microstrip filter.
Fig. 2 is the structural representation of ultra wide band bandpass filter of the present invention.
Fig. 3 is the front view of ultra wide band bandpass filter of the present invention.
Fig. 4 is a structural representation with the resonator (being called for short: three mould resonators) of three primary resonance patterns.
Fig. 5 (a) is the strange mould equivalent electric circuit of three mould resonators.
Fig. 5 (b) is the even mould equivalent electric circuit of three mould resonators.
Fig. 6 is the weak coupling Electromagnetic Simulation result for three mould resonators.
Fig. 7 is the structural representation of a micro band superwide band band pass filter based on three mould resonators.
Fig. 8 is the Electromagnetic Simulation result for the micro band superwide band band pass filter based on three mould resonators.
Fig. 9 is a structural representation with the resonator (being called for short: five mould resonators) of five primary resonance patterns.
Figure 10 (a) is the strange mould equivalent electric circuit of five mould resonators.
Figure 10 (b) is the even mould equivalent electric circuit of five mould resonators.
Figure 11 is the weak coupling Electromagnetic Simulation result for five mould resonators.
Figure 12 is the resonator structure (being called for short: distortion resonator) obtained after being out of shape five mould resonators in Fig. 9.
Figure 13 is the structural representation of a micro band superwide band band pass filter based on distortion resonator.
Figure 14 is the Electromagnetic Simulation result for the micro band superwide band filter based on five mould resonators.
Figure 15 is a structural representation with the resonator (being called for short: multimode resonator) of multiple mode of resonance.
Figure 16 is the structural representation of a micro band superwide band band pass filter based on multimode resonator.
Figure 17 is the S parameter testing and emulation result for the micro band superwide band band pass filter based on multimode resonator.
Figure 18 is the group delay testing and emulation result for the micro band superwide band band pass filter based on multimode resonator.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described further, but embodiments of the present invention are not limited thereto.The schematic diagram of embodiment as shown in Figure 2, the front view of embodiment as shown in Figure 3, following pattern is comprised: 50 ohm of incoming feeders 1 in the metal overlying strata I of micro-band, gradual change impedance transmission lines joint 10, transmission line joint 11, transmission line joint 12, short-circuited transmission line joint 13 (short circuit is realized by plated-through hole 14), open circuited transmission line joint 15, open circuited transmission line joint 31, closed outer toroid 32, transmission line joint 33, annulus 34 in closed, open circuited transmission line joint 35, open circuited transmission line joint 36, transmission line joint 21, transmission line joint 22, gradual change impedance transmission lines joint 20, short-circuited transmission line joint 23 (short circuit is realized by plated-through hole 24), the output feeder 2 of 25 and 50 ohm, open circuited transmission line joint.It is characterized in that: open circuited transmission line joint 31 and open circuited transmission line joint 36 are connected respectively to the two ends of closed outer toroid 32, closed outer toroid 32 is connected with closed interior annulus 34 by transmission line joint 33, transmission line joint 33 extends to open circuited transmission line joint 35, forms the resonator (being called for short: multimode resonator) that has multiple mode of resonance.Can construct ultra wide band bandpass filter based on this multimode resonator, namely incoming feeder 1 is by a gradual change impedance transmission lines joint 10, then by connected transmission line save 11 and transmission line save 12 and carry out energy input with this multimode resonator and be coupled.Output feeder 2 by a gradual change impedance transmission lines joint 20, then by connected transmission line save 21 and transmission line save 22 and carry out Energy transmission with this multimode resonator and be coupled.In order to improve input resistant matching, be connected to short-circuited transmission line joint 13 (short circuit is realized by plated-through hole 14) and an open circuited transmission line joint 15 at incoming feeder 1 place.In order to improve output impedance coupling, be connected to short-circuited transmission line joint 23 (short circuit is realized by plated-through hole 24) and an open circuited transmission line joint 25 at output feeder 2 place.
In order to further prove the unobviousness of structure of the present invention, analyse in depth for embodiment below.First consider a resonator structure as shown in Figure 4, its annexation is as follows: open circuited transmission line joint 31 and open circuited transmission line joint 33 are connected respectively to the two ends of close ring 32.This structure is symmetrical about central plane P, therefore can adopt the analysis method of odd-even model of symmetrical network to analyze.If the central plane P shown in Fig. 4 places short circuit face, then obtain strange mould equivalent electric circuit, as shown in Fig. 5 (a).Wherein, Y
1and Y
2the Characteristic mobility of respective corresponding transmission line, θ
1and θ
2it is the electrical length of respective corresponding transmission line.So, can in the hope of the input admittance Y of strange mould equivalent electric circuit
inofor
When resonator is in strange mould resonance, strange mould input admittance Y
ino=0.Strange mould Resonance Equation can be obtained by above formula:
For convenience of discussing, without loss of generality, consider a kind of special circumstances here, i.e. Y
1=Y
2and θ
1=θ
2, formula (2) can be reduced to
tan
2θ
1＝2 (3)
Its solution in free transmission range has two: θ
1=54.73 °, θ
1=125.27 °.Corresponding resonance frequency is
f
odd1＝4.21GHz，f
odd2＝9.61GHz
If the central plane P shown in Fig. 4 places open circuit surface, then obtain even mould equivalent electric circuit, as shown in Fig. 5 (b).The input admittance Y of even mould equivalent electric circuit
ine:
When resonator is in even mould resonance, even mould input admittance Y
ine=0.Even mould condition of resonance can be obtained by formula (4):
tanθ
1＝tanθ
2＝0 (5)
Corresponding solution is: θ
1=k π, wherein k=1,2 ... for natural number, but the frequency corresponding to these solutions is outside passband, therefore does not consider.The even mould condition of resonance of another one can also be obtained, namely by formula (4)
tanθ
2＝∞
Can obtain
solve resonance frequency: f
even=6.91GHz.
In order to verify above-mentioned theory analysis result, carry out weak coupling Electromagnetic Simulation to resonator structure as shown in Figure 4, corresponding frequency response simulation result as shown in Figure 6.Clearly can obtain three modes of resonance of this resonator in free transmission range, be respectively 4.21GHz, 6.84GHz, 9.58GHz.Visible, the calculated value of resonance frequency and the Electromagnetic Simulation value goodness of fit better, indicate the correctness of parity mode equivalent electric circuit.In the present invention, resonator is as shown in Figure 4 called three mould resonators.Known by above computation and analysis, when using this resonator design filter, according to the resonator condition that the parity mode equivalent electric circuit of three mould resonators is derived, appropriate structural parameters are selected to make its three principal resonant frequency approaches uniformity be distributed in required frequency band, then by parallel coupling structure, feed is carried out to it, be finally optimized in conjunction with electromagnetic simulation software and can obtain passband filtering characteristic.Such as, an embodiment based on the ultra wide band bandpass filter of three mould resonators is given in the figure 7.Incoming feeder 1 passes through connected transmission line joint 11 and transmission line joint 12 and carries out energy input with this multimode resonator and be coupled.Output feeder 2 passes through connected transmission line joint 21 and transmission line joint 22 and carries out Energy transmission with this multimode resonator and be coupled.By Electromagnetic Simulation, give the frequency response simulation result of this ultra wide band bandpass filter in fig. 8, its passband can cover required frequency range 3.1GHz ~ 10.6GHz as seen.
But the band connection frequency selectivity based on the ultra wide band bandpass filter of aforesaid three mould resonators is not fine.In order to improve its frequency selectivity further, construct another one resonator structure, as shown in Figure 9, its annexation is as follows: open circuited transmission line joint 31 and open circuited transmission line joint 35 are connected respectively to the two ends of close ring 32; Close ring 32 is connected with close ring 34 by transmission line joint 33 again.This resonator is also be symmetrical about central plane P, therefore can adopt the analysis method of odd-even model of symmetrical network to analyze.If the central plane P shown in Fig. 9 places short circuit face, then obtain strange mould equivalent electric circuit, as shown in Figure 10 (a).Wherein, Y
1and Y
2the Characteristic mobility of respective corresponding transmission line, θ
1and θ
2it is the electrical length of respective corresponding transmission line.This strange mould equivalent electric circuit is the same with the strange mould equivalent electric circuit of three mould resonators, therefore analytic process is consistent.
If the central plane P shown in Fig. 9 places open circuit surface, then obtain even mould equivalent electric circuit, as shown in Figure 10 (b).Wherein, Y
1, Y
2and Y
3the Characteristic mobility of respective corresponding transmission line, θ
1, θ
2and θ
3it is the electrical length of respective corresponding transmission line.The input admittance Y of even mould equivalent electric circuit can be derived
ine:
Wherein Y
l=jY
2[tan θ
2+ tan (θ
2+ θ
3)].For simplifying computational process, make Y herein
1=Y
2=Y
3, θ
1=θ
2=θ
3/ 2, even mould
The input admittance Y of equivalent electric circuit
inecan be converted into:
Make Y
ine=0 can obtain even mould condition of resonance, namely
2tanθ
1+tan(3θ
1)＝0 (8a)
1-tanθ
1(tanθ
1+tan(3θ
1))＝∞ (8b)
Two solutions can be obtained, namely by equation (8a)
θ
1=40.2 ° and θ
1=139.8 °
Their corresponding two resonance frequencys, namely
f
even1＝3.09GHz，f
even2＝10.72GHz
Can obtain a solution by equation (8b) is
θ
1＝90°
A corresponding resonance frequency, namely
f
even3＝6.91GHz
By the input impedance Z of even mould equivalent electric circuit
ine=0, note Z
ine=1/Y
ine, then obtain
1-3tan
2θ
1＝0
Corresponding two solutions are respectively:
θ
1=30 ° and θ
1=150 °
So the frequency that can obtain two transmission zeros corresponding is:
f
zero1＝2.32GHz，f
zero2＝11.51GHz
Known by analyzing above, this toroidal cavity resonator has five main modes of resonance, and wherein two is strange mould resonance frequency, and three is even resonance frequency.In order to verify above-mentioned theory analysis result, carry out weak coupling emulation to resonator structure as shown in Figure 9, corresponding frequency response simulation result as shown in figure 11.Clearly can obtain five modes of resonance of this resonator in free transmission range, be respectively f
e1=3.25GHz, f
o1=4.26GHz, f
e2=6.91GHz, f
o2=9.62GHz, f
e3=11.03GHz.In addition, emulate two transmission zeros obtained and lay respectively at f
z1=3.01GHz, f
z2=11.55GHz, visible, the calculated value of resonance frequency and simulation value coincide better, demonstrate the correctness of theory analysis.In the present invention, the resonator shown in Fig. 9 is called five mould resonators.
In order to reduce the area of five mould resonators shown in Fig. 9 further, can be out of shape, obtain resonator as shown in figure 12, its annexation is: open circuited transmission line joint 31 and open circuited transmission line joint 35 are connected respectively to the two ends of closed outer toroid 32; Closed outer toroid 32 is connected with closed interior annulus 34 by transmission line joint 33 again.Electromagnetic Simulation result shows, both resonance characteristic basic simlarity.So, based on resonator as shown in figure 12, can ultra wide band bandpass filter be constructed, as shown in figure 13.Incoming feeder 1 passes through connected transmission line joint 11 and transmission line joint 12 and carries out energy input with this multimode resonator and be coupled.Output feeder 2 passes through connected transmission line joint 21 and transmission line joint 22 and carries out Energy transmission with this multimode resonator and be coupled.In order to improve input resistant matching, be connected to short-circuited transmission line joint 13 (short circuit is realized by plated-through hole 14) and an open circuited transmission line joint 15 at incoming feeder 1 place.In order to improve output impedance coupling, be connected to short-circuited transmission line joint 23 (short circuit is realized by plated-through hole 24) and an open circuited transmission line joint 25 at output feeder 2 place.The frequency response simulation result of this ultra wide band bandpass filter provides in fig. 14, and its passband can cover required frequency range 3.1GHz ~ 10.6GHz as seen.In addition, respectively there is a transmission zero in passband both sides, thus greatly improve the frequency selectivity of passband.
But, in frequency response in fig. 14, in the pass-band, there is a significantly depression.In order to eliminate it, with the addition of an open circuited transmission line joint in five mould resonators in fig. 12, obtaining resonator as shown in figure 15.Its annexation is as follows: the two ends that open circuited transmission line joint 31 and open circuited transmission line joint 36 are connected respectively to closed outer toroid 32, closed outer toroid 32 by transmission line joint 33 with closed in annulus 34 be connected, transmission line joint 33 extends to open circuited transmission line and saves 35.So, based on this multimode resonator, can ultra wide band bandpass filter be constructed, as shown in Figure 3.Can construct ultra wide band bandpass filter based on this multimode resonator, namely incoming feeder 1 is by a gradual change impedance transmission lines joint 10, then by connected transmission line save 11 and transmission line save 12 and carry out energy input with this multimode resonator and be coupled.Output feeder 2 by a gradual change impedance transmission lines joint 20, then by connected transmission line save 21 and transmission line save 22 and carry out Energy transmission with this multimode resonator and be coupled.In order to improve input resistant matching, be connected to short-circuited transmission line joint 13 (short circuit is realized by plated-through hole 14) and an open circuited transmission line joint 15 at incoming feeder 1 place.In order to improve output impedance coupling, be connected to short-circuited transmission line joint 23 (short circuit is realized by plated-through hole 24) and an open circuited transmission line joint 25 at output feeder 2 place.
In order to verify analysis above further, carry out processing test to ultra wide band bandpass filter as shown in Figure 3.Select substrate to be RT/Duorid5880, relative dielectric constant is 2.2, and dielectric thickness is 0.508mm.Concrete size is as shown in figure 16: w
1=w
2=w
3=0.12mm, l
1=8.4mm, l
2=3.12mm, l
3=4.2mm, l
4=0.37mm, l
5=2.2mm, l
6=2.6mm, r
1=4.68mm, r
2=5.38mm, r
3=5.52mm, r
4=5.8mm.Use vector network analyzer to test this filter, test result as shown in Figure 17 and Figure 18.As can be known from Fig. 17, the three dB bandwidth of this filter is 3.01GHz ~ 10.70GHz, and relative bandwidth is 112%, covers UWB bandwidth requirement completely.In passband, Insertion Loss is less than 1.8dB, and return loss is greater than 7dB.In addition, 30dB bandwidth is 2.81GHz ~ 11.01GHz, and can obtain squareness factor is 1.066, shows its good frequency selective characteristic.Group delay is at 0.5ns ~ 0.8ns, comparatively smooth.Except the return loss caused because of mismachining tolerance and error of measurement instrument worsens, test result and the simulation result goodness of fit of embodiment are better.
Those of ordinary skill in the art will appreciate that, embodiment described here is to help reader understanding's principle of the present invention, should be understood to that protection scope of the present invention is not limited to so special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combination of not departing from essence of the present invention according to these technology enlightenment disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.
Claims (3)
1. a micro-band multimode resonator, comprises following pattern in the metal overlying strata I of micro-band: open circuited transmission line joint 31, closed outer toroid 32, transmission line joint 33, closed in annulus 34, open circuited transmission line joint 35 and open circuited transmission line save 36; It is characterized in that: open circuited transmission line joint 31 and open circuited transmission line joint 36 are connected respectively to closed outer toroid 32 two ends; Closed outer toroid 32 by a transmission line joint 33 with closed in annulus 34 be connected, closed outer toroid 32 and closed in annulus 34 there is the identical center of circle, just radius difference; Minor matters 33 extend to the center of circle, are open circuited transmission line joint 35.These parts form a multimode resonator.
2. according to claim 1, a micro band superwide band filter can be constructed, following pattern is comprised: incoming feeder 1 in the metal overlying strata I of micro-band, gradual change impedance transmission lines joint 10, transmission line joint 11, transmission line joint 12, short-circuited transmission line joint 13 (short circuit is realized by plated-through hole 14), open circuited transmission line joint 15, output feeder 2, gradual change impedance transmission lines joint 20, transmission line joint 21, transmission line joint 22, short-circuited transmission line joint 23 (short circuit is realized by plated-through hole 24), open circuited transmission line joint 25, open circuited transmission line joint 31, closed outer toroid 32, transmission line joint 33, annulus 34 in closed, open circuited transmission line joint 35 and open circuited transmission line joint 36, it is characterized in that: open circuited transmission line joint 31 and open circuited transmission line joint 36 are connected respectively to closed outer toroid 32 two ends, closed outer toroid 32 by a transmission line joint 33 with closed in annulus 34 be connected, closed outer toroid 32 and closed in annulus 34 there is the identical center of circle, just radius difference, transmission line joint 33 extends to the center of circle, is open circuited transmission line joint 35.These parts form a multimode resonator.Incoming feeder 1 by a gradual change impedance transmission lines joint 10, then carries out input Energy Coupling by connected transmission line joint 11 and transmission line joint 12 with this multimode resonator.Output feeder 2 by a gradual change impedance transmission lines joint 20, then carries out Energy Coupling by connected transmission line joint 21 and transmission line joint 22 with this multimode resonator.In order to improve input resistant matching, be connected to short-circuited transmission line joint 13 (short circuit is realized by plated-through hole 14) and an open circuited transmission line joint 15 at incoming feeder 1 place.In order to improve output impedance coupling, be connected to short-circuited transmission line joint 23 (short circuit is realized by plated-through hole 24) and an open circuited transmission line joint 25 at output feeder 2 place.
3., according to claim 2, in order to improve input resistant matching, be connected to short-circuited transmission line joint 13 (short circuit is realized by plated-through hole 14) and an open circuited transmission line joint 15 at incoming feeder 1 place; In order to improve output impedance coupling, be connected to short-circuited transmission line joint 23 (short circuit is realized by plated-through hole 24) and an open circuited transmission line joint 25 at output feeder 2 place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510257745.0A CN104900947B (en) | 2015-05-20 | 2015-05-20 | Micro band superwide band bandpass filter with good frequency selective characteristic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510257745.0A CN104900947B (en) | 2015-05-20 | 2015-05-20 | Micro band superwide band bandpass filter with good frequency selective characteristic |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104900947A true CN104900947A (en) | 2015-09-09 |
| CN104900947B CN104900947B (en) | 2017-10-27 |
Family
ID=54033457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510257745.0A Expired - Fee Related CN104900947B (en) | 2015-05-20 | 2015-05-20 | Micro band superwide band bandpass filter with good frequency selective characteristic |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104900947B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105514550A (en) * | 2015-12-09 | 2016-04-20 | 熊猫电子集团有限公司 | Multi-zero-point compact microstrip filter |
| EP3439110A4 (en) * | 2016-08-09 | 2019-12-11 | Tongyu Communication Inc. | Filter feed network and base-station antenna |
| CN112929098A (en) * | 2021-01-21 | 2021-06-08 | 电子科技大学 | Control network for reducing phase noise of microstrip oscillator |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100759940B1 (en) * | 2006-03-20 | 2007-09-18 | 한국과학기술원 | A ring-type resonant cell and an microwave oscillator utilizing the ring-type resonant cell and efficiency enhancement method of it |
| US20080129419A1 (en) * | 2006-12-05 | 2008-06-05 | Chin-Shen Cheng | Dual-mode dual-ring band-pass filter |
| CN203056045U (en) * | 2012-12-04 | 2013-07-10 | 哈尔滨飞羽科技有限公司 | Novel loop antenna filter |
| CN203134940U (en) * | 2013-01-14 | 2013-08-14 | 中国计量学院 | Periodic concentric double-ring structure terahertz wave filter |
-
2015
- 2015-05-20 CN CN201510257745.0A patent/CN104900947B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100759940B1 (en) * | 2006-03-20 | 2007-09-18 | 한국과학기술원 | A ring-type resonant cell and an microwave oscillator utilizing the ring-type resonant cell and efficiency enhancement method of it |
| US20080129419A1 (en) * | 2006-12-05 | 2008-06-05 | Chin-Shen Cheng | Dual-mode dual-ring band-pass filter |
| CN203056045U (en) * | 2012-12-04 | 2013-07-10 | 哈尔滨飞羽科技有限公司 | Novel loop antenna filter |
| CN203134940U (en) * | 2013-01-14 | 2013-08-14 | 中国计量学院 | Periodic concentric double-ring structure terahertz wave filter |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105514550A (en) * | 2015-12-09 | 2016-04-20 | 熊猫电子集团有限公司 | Multi-zero-point compact microstrip filter |
| EP3439110A4 (en) * | 2016-08-09 | 2019-12-11 | Tongyu Communication Inc. | Filter feed network and base-station antenna |
| CN112929098A (en) * | 2021-01-21 | 2021-06-08 | 电子科技大学 | Control network for reducing phase noise of microstrip oscillator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104900947B (en) | 2017-10-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108417938B (en) | A kind of micro-strip model filters power splitter | |
| CN105024124B (en) | A kind of new more minor matters multimode resonators and the micro band superwide band bandpass filter based on it | |
| CN113346205B (en) | Continuous same broadband triplexer of generalized Chebyshev function response channel | |
| CN104681900B (en) | The high-isolation duplexer of electromagnetism branch coupling | |
| CN104505562A (en) | Micro-strip ultra-wideband band pass filter with good band stop characteristic | |
| CN105304983A (en) | Band pass filter based on a T-shaped sub-loaded half-wavelength resonator | |
| CN104201450A (en) | Micro-strip ultra wideband band-pass filter having wave trapping characteristic | |
| CN107895829B (en) | Microstrip filter with third-order quasi-elliptic band-pass frequency response | |
| CN104659450A (en) | Broadband differential band-pass filter based on cross resonator | |
| CN102299697A (en) | Composite right/left handed transmission line and design method thereof as well as duplexer based on transmission line | |
| CN104900947A (en) | Micro-strip ultra wide band band-pass filter with marked frequency selection characteristic | |
| CN110112526A (en) | A kind of microstrip power divider with dual-passband frequency response | |
| CN107256995A (en) | A kind of micro-strip dual-pass band-pass filter | |
| Li et al. | A miniaturization band-pass filter with ultra-narrow multi-notch-band characteristic for ultra-wideband communication applications | |
| CN105070990A (en) | Micro-strip ultra wide band band-pass filter based on novel multimode resonator which is shaped like a Chinese character wang | |
| CN203644913U (en) | Trapped-wave frequency-band ultra-wide band-pass filter based on terminal-short-circuit cross resonator | |
| CN105720334A (en) | Band-pass filter based on multi-branch loading annular resonator | |
| KR20120094225A (en) | The novel metamaterial crlh building-block for a multi-pole bandpass filter and the improved channel selectivity by its cross-coupling version for compact gbps wireless tranceivers | |
| CN103779641A (en) | Novel UWB filter of central loading folding limb multi-mode resonator structure | |
| Wang et al. | Miniaturized substrate integrated waveguide filters with stepped-impedance slot resonators for millimeter-wave application | |
| CN103151582A (en) | Micro wave and micro band band-pass filter for miniature large double-frequency ratio wide band | |
| Liu et al. | A novel UWB filter with WLAN and RFID stop-band rejection characteristic using tri-stage radial loaded stub resonators | |
| Dai et al. | Design and implementation of an LTCC filter with high stopband rejection | |
| CN204375891U (en) | Plane lower passband leads to double frequency filter | |
| CN206076460U (en) | A kind of plane CQ duplexer based on new matching network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into 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 |
Granted publication date: 20171027 Termination date: 20190520 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |