CN104900947B - Micro band superwide band bandpass filter with good frequency selective characteristic - Google Patents
Micro band superwide band bandpass filter with good frequency selective characteristic Download PDFInfo
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Abstract
Ultra-wide band filter is the Primary Component in ultra-wideband communication system, and its performance determines the overall performance of system.The present invention relates to a kind of micro band superwide band bandpass filter, it is based on a kind of new multimode resonator, it is characterised in that the first open circuited transmission line section (31) and the second open circuited transmission line section (36) are connected respectively to closure outer toroid (32) two ends；Closure outer toroid (32) is connected by transmission line section (33) with closure interior annular (34), and closure outer toroid (32) and closure interior annular (34) have the identical center of circle, and simply radius is different；Transmission line section (33) is extended to the center of circle, as the 3rd open circuited transmission line section (35).Research shows that ultra wide band bandpass filter of the present invention has the advantages that good frequency selectivity, compact dimensions.
Description
Technical field
The invention belongs to communication technical field, and in particular to a kind of micro band superwide band bandpass filter.
Background technology
In 2002, FCC (FCC) opened the frequency range between 3.1GHz~10.6GHz for communication
The application in field.Because the advantages of its high transfer rate and low transmission are lost, ultra-wideband communications receive extensive attention and obtained
Swift and violent development is arrived.As the Primary Component in ultra-wideband communication system, the performance of ultra wide band bandpass filter, which is determined, is
The overall performance of system.However, the ultra wide band bandpass filter of small design, high-performance and low cost is still a major challenge.
The content of the invention
The invention aims to overcome existing ultra wide band bandpass filter deficiency, there is provided a kind of micro band superwide band
Bandpass filter.The wave filter has the advantages that good band connection frequency selectivity, size is smaller, easily debug.
The structure of model microstrip line is as shown in figure 1, mainly include three layers.Tier I is metal overlying strata, and tier ii is medium
Substrate, layer III is coating under metal.The structure of micro band superwide band bandpass filter of the present invention is as shown in Figure 2.Filtering
The front of device is as shown in figure 3, the technical scheme used is：As shown in Figure 3 in the inner etching of the metal overlying strata (I) of microstrip line
Pattern.It is characterized in that：First open circuited transmission line section (31) and the second open circuited transmission line section (36) are connected respectively to a closure
Outer toroid (32) two ends；Closure outer toroid (32) is connected by transmission line section (33) with closure interior annular (34), closes outer toroid
(32) and closure interior annular (34) has the identical center of circle, simply radius is different；Transmission line section (33) is extended to the center of circle, i.e.,
For the 3rd open circuited transmission line section (35).These parts constitute a multimode resonator.Incoming feeder (1) passes through the first gradual change impedance
Transmission line section (10), then by the 4th open circuited transmission line section (11) connected and the 5th open circuited transmission line section (12) and this multimode
Resonator carries out input energy coupling.Output feeder (2) by the second gradual change impedance transmission lines section (20), then by connected
Six open circuited transmission line sections (21) and the 7th open circuited transmission line section (22) carry out energy coupling with this multimode resonator.In order to improve
Input resistant matching, the first short-circuited transmission line section (13) is connected at incoming feeder (1) place, short circuit is by the first plated-through hole
(14) realize, and the 8th open circuited transmission line section (15).In order to improve output impedance matching, it is connected at output feeder (2) place
Second short-circuited transmission line section (23), short circuit is realized by the second plated-through hole (24), and the 9th open circuited transmission line section (25).
The beneficial effects of the invention are as follows：Compared with existing wave filter, the resonator contained by wave filter of the invention is one
Individual multimode resonator.The bandwidth of the wave filter constituted can be with covering ultra wideband frequency range, and the frequency selectivity of passband is preferable,
Out-of-band rejection better performances, the advantages of size is smaller.
Brief description of the drawings
Fig. 1 is the composite layer that the present invention is used to process 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, which is one, has the resonator of three primary resonance patterns (referred to as：Three mould resonators) structural representation.
Fig. 5 (a) is the strange mould equivalent circuit of three mould resonators.
Fig. 5 (b) is the even mould equivalent 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 bandpass filter based on three mould resonators.
Fig. 8 is the Electromagnetic Simulation result for the micro band superwide band bandpass filter based on three mould resonators.
Fig. 9, which is one, has the resonator of five primary resonance patterns (referred to as：Five mould resonators) structural representation.
Figure 10 (a) is the strange mould equivalent circuit of five mould resonators.
Figure 10 (b) is the even mould equivalent circuit of five mould resonators.
Figure 11 is the weak coupling Electromagnetic Simulation result for five mould resonators.
Figure 12 is a resonator structure (abbreviation obtained after being deformed to five mould resonators in Fig. 9：Deform resonance
Device).
Figure 13 is the structural representation of a micro band superwide band bandpass filter based on deformation resonator.
Figure 14 is the Electromagnetic Simulation result for the micro band superwide band wave filter based on five mould resonators.
Figure 15, which is one, has the resonator of multiple modes of resonance (referred to as：Multimode resonator) structural representation.
Figure 16 is the structural representation of a micro band superwide band bandpass filter based on multimode resonator.
Figure 17 is the S parameter test and simulation result for the micro band superwide band bandpass filter based on multimode resonator.
Figure 18 is the group delay test and simulation result for the micro band superwide band bandpass filter based on multimode resonator.
Embodiment
The present invention is described further with specific embodiment below in conjunction with the accompanying drawings, but embodiments of the present invention are not limited
In this.The schematic diagram of embodiment is as shown in Fig. 2 the front view of embodiment is as shown in figure 3, in the metal overlying strata I of micro-strip
Including following pattern：50 ohm of incoming feeders (1), the first gradual change impedance transmission lines section (10), the 4th open circuited transmission line section (11),
5th open circuited transmission line section (12), the first short-circuited transmission line section 13, the first plated-through hole (14), the 8th open circuited transmission line section
(15), the first open circuited transmission line section (31), closure outer toroid (32), transmission line section (33), closure interior annular (34), the 3rd open circuit
Transmission line section (35), the second open circuited transmission line section (36), the 6th open circuited transmission line section (21), the 7th open circuited transmission line section (22),
Second gradual change impedance transmission lines section (20), the second short-circuited transmission line section (23), the second plated-through hole (24), the 9th open-circuit transfer
Line section (25) and 50 ohm of output feeder (2).It is characterized in that：First open circuited transmission line section (31) and the second open circuited transmission line
Section (36) is connected respectively to the two ends of closure outer toroid (32), and closure outer toroid (32) passes through transmission line section (33) and closure inner circle
Ring (34) is connected, and transmission line section (33) extends to the 3rd open circuited transmission line section (35), and constituting one has multiple modes of resonance
Resonator is (referred to as：Multimode resonator).Ultra wide band bandpass filter, i.e. incoming feeder can be constructed based on this multimode resonator
(1) by the first gradual change impedance transmission lines section (10), then by the 4th open circuited transmission line section (11) connected and the 5th open circuit biography
Defeated line section (12) carries out energy input with this multimode resonator and coupled.Output feeder (2) passes through the second gradual change impedance transmission lines
Save (20), then by the 6th open circuited transmission line section (21) connected and the 7th open circuited transmission line section (22) and this multimode resonator
Carry out energy output coupling.In order to improve input resistant matching, the first short-circuited transmission line section is connected at incoming feeder (1) place
(13), short circuit is realized by the first plated-through hole (14), and the 8th open circuited transmission line section (15).In order to improve output impedance
Match somebody with somebody, the second short-circuited transmission line section (23) be connected at output feeder (2) place, short circuit is realized by the second plated-through hole (24),
With the 9th open circuited transmission line section (25).
In order to further prove the unobviousness of structure of the present invention, analysed in depth below for embodiment.
First consider a resonator structure as shown in Figure 4, its annexation is as follows：First open circuited transmission line section (31) and the second open circuit
Transmission line section (36) is connected respectively to the two ends of closure outer toroid (32).It on central plane P is symmetrical that this structure, which is,
, therefore can be analyzed using the analysis method of odd-even model of symmetrical network.If put in the central plane P shown in Fig. 4
Short-circuit face is put, then strange mould equivalent circuit is obtained, shown in such as Fig. 5 (a).Wherein, Y1And Y2It is that the respective feature for corresponding to transmission line is led
Receive, θ1And θ2It is the electrical length of respective correspondence transmission line.Thus it is possible to try to achieve the input admittance Y of strange mould equivalent circuitinoFor
When resonator is in strange mould resonance, strange mould input admittance Yino=0.Strange mould Resonance Equation can be obtained by above formula：
For convenience of discussing, without loss of generality, a kind of special circumstances, i.e. Y are considered here1=Y2And θ1=θ2, formula (2) can
It is reduced to
tan2θ1=2 (3)
Its solution in free transmission range has two：θ1=54.73 °, θ1=125.27 °.Corresponding resonant frequency is
fodd1=4.21GHz, fodd2=9.61GHz
If placing open circuit surface in the central plane P shown in Fig. 4, even mould equivalent circuit is obtained, shown in such as Fig. 5 (b).It is even
The input admittance Y of mould equivalent circuitine：
When resonator is in even mould resonance, even mould input admittance Yine=0.Even mould resonance bar can be obtained by formula (4)
Part：
tanθ1=tan θ2=0 (5)
Corresponding solution is：θ1=k π, wherein k=1,2 ... be natural number, but the corresponding frequency of these solutions is in passband
Outside, therefore do not consider.Another even mould condition of resonance can also be obtained by formula (4), i.e.,
tanθ2=∞
It can obtainSolve resonant frequency：feven=6.91GHz.
In order to verify above-mentioned theory analysis result, weak coupling Electromagnetic Simulation is carried out to resonator structure as shown in Figure 4, it is right
The frequency response simulation result answered is as shown in Figure 6.Three resonant modes of the resonator in free transmission range can clearly be obtained
Formula, respectively 4.21GHz, 6.84GHz, 9.58GHz.It can be seen that, the calculated value and the Electromagnetic Simulation value goodness of fit of resonant frequency are preferable,
Indicate the correctness of parity mode equivalent circuit.In the present invention, resonator as shown in Figure 4 is referred to as three mould resonators.It is logical
Calculated more than crossing and analysis is understood, when using the resonator design wave filter, according to the parity mode equivalent electric of three mould resonators
Resonator condition derived from road, selects appropriate structural parameters to be distributed in its three principal resonant frequency approaches uniformities required
Frequency band in, then it is fed by parallel coupling structure, finally optimizes and can obtain with reference to electromagnetic simulation software
To passband filtering characteristic.For example, being presented in Fig. 7 the implementation of a ultra wide band bandpass filter based on three mould resonators
Example.It is many with this that incoming feeder (1) passes through connected the 4th open circuited transmission line section (11) and the 5th open circuited transmission line section (12)
Mould resonator carries out energy input coupling.Output feeder (2) passes through connected the 6th open circuited transmission line section (21) and the 7th and opened
Road transmission line section (22) carries out energy output coupling with this multimode resonator.By Electromagnetic Simulation, this has been presented in Fig. 8
The frequency response simulation result of ultra wide band bandpass filter, it is seen that its passband can cover needed for frequency range 3.1GHz~
10.6GHz。
However, the band connection frequency selectivity of the ultra wide band bandpass filter based on three foregoing mould resonators is not fine.
In order to further improve its frequency selectivity, another resonator structure is constructed, as shown in figure 9, its annexation is as follows：
First open circuited transmission line section (31) and the second open circuited transmission line section (36) are connected respectively to the two ends of closure outer toroid (32)；Closure
Outer toroid (32) is connected by transmission line section (33) with closure interior annular (34) again.This resonator is also on central plane P
It is symmetrical, therefore can be analyzed using the analysis method of odd-even model of symmetrical network.If in shown in Fig. 9
Heart plane P places short-circuit face, then strange mould equivalent circuit is obtained, shown in such as Figure 10 (a).Wherein, Y1And Y2It is respective correspondence transmission line
Characteristic mobility, θ1And θ2It is the electrical length of respective correspondence transmission line.The strange mould of this strange mould equivalent circuit and three mould resonators is equivalent
Circuit is the same, therefore analysis process is consistent.
If placing open circuit surface in the central plane P shown in Fig. 9, even mould equivalent circuit is obtained, shown in such as Figure 10 (b).
Wherein, Y1、Y2And Y3It is the Characteristic mobility of respective correspondence transmission line, θ1、θ2And θ3It is the electrical length of respective correspondence transmission line.Can be with
The input admittance Y of the even mould equivalent circuit of exportine：
Wherein YL=jY2[tanθ2+tan(θ2+θ3)].To simplify calculating process, Y is made herein1=Y2=Y3, θ1=θ2=θ3/
2, the input admittance Y of even mould equivalent circuitineIt can be converted into：
Make Yine=0 can obtain even mould condition of resonance, i.e.,
2tanθ1+tan(3θ1)=0 (8a)
1-tanθ1(tanθ1+tan(3θ1))=∞ (8b)
Two solutions can be obtained by equation (8a), i.e.,
θ1=40.2 ° and θ1=139.8 °
Their two resonant frequencies of correspondence, i.e.,
feven1=3.09GHz, feven2=10.72GHz
Can obtain a solution by equation (8b) is
θ1=90 °
One resonant frequency of correspondence, i.e.,
feven3=6.91GHz
By the input impedance Z of even mould equivalent circuitine=0, note Zine=1/Yine, then obtain
1-3tan2θ1=0
Corresponding to two solutions is respectively：
θ1=30 ° and θ1=150 °
Thus it is possible to obtain the corresponding frequency of two transmission zeros and be：
fzero1=2.32GHz, fzero2=11.51GHz
Analyzed more than, the toroidal cavity resonator there are five main modes of resonance, two of which is strange mould resonance
Frequency, three are even resonant frequency.In order to verify above-mentioned theory analysis result, resonator structure as shown in Figure 9 is carried out weak
Coupling Simulation, corresponding frequency response simulation result is as shown in figure 11.The resonator can clearly be obtained in free transmission range
Five modes of resonance, respectively fe1=3.25GHz, fo1=4.26GHz, fe2=6.91GHz, fo2=9.62GHz, fe3=
11.03GHz.In addition, two transmission zeros that emulation is obtained are located at f respectivelyz1=3.01GHz, fz2=11.55GHz, it is seen then that humorous
The calculated value and simulation value of vibration frequency coincide preferably, demonstrate the correctness of theory analysis.In the present invention, by shown in Fig. 9
Resonator is referred to as five mould resonators.
In order to further reduce the area of five mould resonators shown in Fig. 9, it can be deformed, obtain as shown in figure 12
Resonator, its annexation is：First open circuited transmission line section (31) and the second open circuited transmission line section (36) are connected respectively to closure
The two ends of outer toroid (32)；Closure outer toroid (32) is connected by transmission line section (33) with closure interior annular (34) again.Electromagnetism is imitated
True result shows that both resonance characteristics are substantially similar.Then, based on resonator as shown in figure 12, ultra wide band can be constructed
Bandpass filter, as shown in figure 13.Incoming feeder (1) passes through connected the 4th open circuited transmission line section (11) and the 5th open circuit is passed
Defeated line section (12) carries out energy input with this multimode resonator and coupled.Output feeder (2) passes through the 6th connected open circuit and passed
Defeated line section (21) and the 7th open circuited transmission line section (22) carry out energy output coupling with this multimode resonator.In order to improve input
Impedance matching, is connected to the first short-circuited transmission line section (13) at incoming feeder (1) place, short circuit by the first plated-through hole (14) Lai
Realize, and the 8th open circuited transmission line section (15).In order to improve output impedance matching, second is connected at output feeder (2) place short
Road transmission line section (23), short circuit is realized by the second plated-through hole (24), and the 9th open circuited transmission line section (25).This ultra-wide
Frequency response simulation result with bandpass filter is presented in Fig. 14, it is seen that its passband can cover required frequency range
3.1GHz~10.6GHz.In addition, respectively having a transmission zero in passband both sides, so as to greatly improve the frequency selection of passband
Property.
However, in frequency response in fig. 14, in the pass-band between occur in that an obvious depression.In order to eliminate it,
The 3rd open circuited transmission line section (35) is with the addition of in five mould resonators in fig. 12, resonator as shown in figure 15 is obtained.It connects
Connect relation as follows：First open circuited transmission line section (31) and the second open circuited transmission line section (36) are connected respectively to closure outer toroid (32)
Two ends, closure outer toroid (32) by transmission line section (33) with close interior annular (34) be connected, transmission line section (33) is extended to
3rd open circuited transmission line section (35).Then, based on this multimode resonator, ultra wide band bandpass filter can be constructed, such as Fig. 3 institutes
Show.Ultra wide band bandpass filter, i.e. incoming feeder (1) can be constructed based on this multimode resonator to pass by the first gradual change impedance
Defeated line section (10), then it is humorous by the 4th open circuited transmission line section (11) connected and the 5th open circuited transmission line section (12) and this multimode
The device that shakes carries out energy input coupling.Output feeder (2) by the second gradual change impedance transmission lines section (20), then by connected the 6th
Open circuited transmission line section (21) and the 7th open circuited transmission line section (22) carry out energy output coupling with this multimode resonator.In order to change
Kind input resistant matching, the first short-circuited transmission line section (13) is connected at incoming feeder (1) place, short circuit is by the first plated-through hole
(14) realize, and the 8th open circuited transmission line section (15).In order to improve output impedance matching, it is connected at output feeder (2) place
Second short-circuited transmission line section (23), short circuit is realized by the second plated-through hole (24), and the 9th open circuited transmission line section (25).
In order to further verify analysis above, processing test has been carried out to ultra wide band bandpass filter as shown in Figure 3.
It is RT/Duorid5880 from substrate, relative dielectric constant is 2.2, and dielectric thickness is 0.508mm.Specific size such as Figure 16 institutes
It is shown as：w1=w2=w3=0.12mm, l1=8.4mm, l2=3.12mm, l3=4.2mm, l4=0.37mm, l5=2.2mm, l6=
2.6mm, r1=4.68mm, r2=5.38mm, r3=5.52mm, r4=5.8mm.Using vector network analyzer to the wave filter
Tested, test result is as shown in Figure 17 and Figure 18.As can be known from Fig. 17, the three dB bandwidth of the wave filter be 3.01GHz~
10.70GHz, relative bandwidth is 112%, and UWB bandwidth requirements are completely covered.Insertion Loss is less than 1.8dB in passband, and return loss is more than
7dB.In addition, 30dB is with a width of 2.81GHz~11.01GHz, it is 1.066 that can obtain squareness factor, shows its good frequency selection
Characteristic.Group delay is relatively flat in 0.5ns~0.8ns.Except because the echo that mismachining tolerance and error of measurement instrument are caused is damaged
Outside consumption deteriorates, the test result and the simulation result goodness of fit of embodiment are preferable.
One of ordinary skill in the art will be appreciated that embodiment described here is to aid in reader and understands this hair
Bright principle, it should be understood that protection scope of the present invention is not limited to such especially statement and embodiment.This area
Those of ordinary skill can make according to these technical inspirations disclosed by the invention various does not depart from the other each of essence of the invention
Plant specific deformation and combine, these deformations and combination are still within the scope of the present invention.
Claims (2)
1. a kind of micro-strip multimode resonator, includes following pattern in the metal overlying strata (I) of micro-strip：First open circuited transmission line section
(31), closure outer toroid (32), transmission line section (33), closure interior annular (34), the 3rd open circuited transmission line section (35) and second are opened
Road transmission line section (36)；It is characterized in that：First open circuited transmission line section (31) and the second open circuited transmission line section (36) are connected respectively
To closure outer toroid (32) two ends；Closure outer toroid (32) is connected by transmission line section (33) with closure interior annular (34), is closed
Outer toroid (32) and closure interior annular (34) have the identical center of circle, and simply radius is different；Transmission line section (33) is carried out to the center of circle
Extension, as the 3rd open circuited transmission line section (35).
2. a kind of micro band superwide band wave filter, includes following pattern in the metal overlying strata (I) of micro-strip：Incoming feeder (1),
One gradual change impedance transmission lines section (10), the 4th open circuited transmission line section (11), the 5th open circuited transmission line section (12), the first short circuit transmission
Line section (13), the first plated-through hole (14), the 8th open circuited transmission line section (15), output feeder (2), the second gradual change impedance transfer
Line section (20), the 6th open circuited transmission line section (21), the 7th open circuited transmission line section (22), the second short-circuited transmission line section (23), second
Plated-through hole (24), the 9th open circuited transmission line section (25), the first open circuited transmission line section (31), closure outer toroid (32), transmission
Line section (33), closure interior annular (34), the 3rd open circuited transmission line section (35) and the second open circuited transmission line section (36)；Its feature exists
In：First open circuited transmission line section (31) and the second open circuited transmission line section (36) are connected respectively to closure outer toroid (32) two ends；Close
Close outer toroid (32) to be connected with closure interior annular (34) by a transmission line section (33), closure outer toroid (32) and closure inner circle
Ring (34) has the identical center of circle, and simply radius is different；Transmission line section (33) is extended to the center of circle, as the 3rd open-circuit transfer
Line section (35)；The first open circuited transmission line section (31), closure outer toroid (32), transmission line section (33), closure interior annular (34),
3rd open circuited transmission line section (35) and the second open circuited transmission line section (36) constitute a multimode resonator；Incoming feeder (1) passes through
First gradual change impedance transmission lines section (10), then by the 4th open circuited transmission line section (11) connected and the 5th open circuited transmission line section
(12) input energy is carried out with this multimode resonator to couple；Output feeder (2) by the second gradual change impedance transmission lines section (20),
Again energy is carried out by the 6th open circuited transmission line section (21) connected and the 7th open circuited transmission line section (22) with this multimode resonator
Amount coupling；In order to improve input resistant matching, be connected to the first short-circuited transmission line section (13) at incoming feeder (1) place, short circuit by
First plated-through hole (14) is realized, and the 8th open circuited transmission line section (15)；In order to improve output impedance matching, in output feedback
Line (2) place is connected to the second short-circuited transmission line section (23), and short circuit is realized by the second plated-through hole (24), and the 9th open circuit is passed
Defeated line section (25).
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| CN105514550A (en) * | 2015-12-09 | 2016-04-20 | 熊猫电子集团有限公司 | Multi-zero-point compact microstrip filter |
| CN209183755U (en) * | 2016-08-09 | 2019-07-30 | 广东通宇通讯股份有限公司 | Feeding network |
| CN112929098B (en) * | 2021-01-21 | 2022-08-30 | 电子科技大学 | Control network for reducing phase noise of microstrip oscillator |
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|---|---|---|---|---|
| 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 |
| 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 |
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| US20080129419A1 (en) * | 2006-12-05 | 2008-06-05 | Chin-Shen Cheng | Dual-mode dual-ring band-pass filter |
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| 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 |
| 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 |
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