CN104993195B - A kind of more transmission zero balance filters loaded using coupling feed - Google Patents
A kind of more transmission zero balance filters loaded using coupling feed Download PDFInfo
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- CN104993195B CN104993195B CN201510277795.5A CN201510277795A CN104993195B CN 104993195 B CN104993195 B CN 104993195B CN 201510277795 A CN201510277795 A CN 201510277795A CN 104993195 B CN104993195 B CN 104993195B
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Abstract
The invention discloses a kind of more transmission zero balance filters loaded using coupling feed, including symmetrical first and second Differential Input port, symmetrical first and second difference output port and symmetrical first and second minor matters loading toroidal cavity resonator；First, level is associated with first respectively for two Differential Input ports, two impedance transformation lines, first, level is associated with the 3rd to two difference output ports respectively, four impedance transformation lines, first impedance transformation line is loaded with the first feeder line, 3rd impedance transformation line is loaded with the second feeder line, first minor matters load the toroidal cavity resonator part and first of toroidal cavity resonator, two feeder lines couple, second impedance transformation line is loaded with the 3rd feeder line, 4th impedance transformation line is loaded with the 4th feeder line, second minor matters load the toroidal cavity resonator part and the 3rd of toroidal cavity resonator, four feeder lines couple, first, the first minor matters are loaded between three feeder lines, second, second is loaded between four feeder lines, three minor matters.The present invention has the advantages that high selectivity, high common mode inhibition, low differential loss.
Description
Technical field
The present invention relates to the technical field of microwave communication, refers in particular to a kind of more transmission zeros loaded using coupling feed
Balance filter.
Background technology
With the development of modern communication technology, balance filter obtains due to having higher immunity to ambient noise
Increasing concern, but it is provided simultaneously with the weight that high common mode inhibition, high selectivity, low-loss balance filter are still research
Point and difficult point.For suppression common mode, can using GDS defects, the loading of symmetrical minor matters, introduce transmission path, slot line structure etc. and carry out reality
It is existing.But these methods do not have the selectivity for improving differential mode passband.Therefore, some different methods are used to introduce transmission zero
Point, such as direct minor matters loading, source-load coupling, four stage structures of cascade, not only increases the complexity of design, can also be to altogether
Mould suppresses to have an impact.On the other hand, high-performance balance filter proposes harsher requirement to differential mode passband differential loss.Some
High common mode inhibition structure such as slot line structure can cause passband differential loss larger due to itself radiation loss.In addition, some high selectivities
Structure is as cascaded four stage structures because the increase passband differential loss of exponent number is also bigger than normal.Therefore, study high selectivity, high common mode inhibition,
Low-loss more transmission zero balance filters have extremely important theory significance, great economic benefit and wide application
Prospect.
Balance filter proposes for a long time, to do one with regard to the prior art of the high common mode inhibition balance filter of high selectivity below
Investigation.Wherein most basic is achieved in that a series of minor matters loading structures proposed using Lei Zhu team as representative.Such as its
Entitled " Highly is delivered in IEEE Microwave and Wireless Components Letters within 2009
Selective differential-mode wideband bandpass filter for UWB application " text
Chapter, as shown in figure 8, in order to improve the selectivity of differential mode passband, quarter-wave minor matters are replaced with 3/4ths wavelength branches
Section.It not only produces two transmission zeros outside passband, and common mode stopband also increases two transmission zeros.This method
Advantage is to improve the selectivity of differential mode passband, while widens common mode inhibition model.Shortcoming be differential mode pass band insertion loss is larger, size compared with
Greatly.
To realize miniaturization and high abruptness, Q X Chu team in 2013 is in IEEE Microwave and Wireless
Entitled " the Differential Wideband Bandpass Filter With delivered on Components Letters
In High-Selectivity and Common-Mode Suppression ", traditional transmission line is substituted using coupling minor matters
Minor matters.As shown in figure 9, coupling minor matters, which substitute traditional minor matters connecting line, can realize wider passband, and short circuit couples minor matters
Because its dual transfer zero characteristic can introduce two transmission zeros in passband.Dual path is then used for common mode inhibition.It is this
The advantages of method designs is miniaturization, selectivity height.Shortcoming is that common mode inhibition is ineffective, only 10dB or so.
W Q Che team delivers entitled in IET Microwaves, Antennas＆Propagation within 2014
“Compact wideband balanced bandpass filter with highcommon-mode suppression
In based on cascade parallel coupled lines " article, propose wider using parallel coupled line realization
Differential mode passband and higher common mode inhibition, as shown in Figure 10.To improve the selectivity of passband, input/output port additionally cascade pair
The SIR minor matters of title, add the complexity of design.
In order to realize high selectivity and high common mode inhibition simultaneously, it is normal that step electric impedance resonator cascades four stage structures (SIR-CQ)
It is used in the design of balance filter.As shown in figure 11, two pairs of different impedance ratios and two/wavelength of electrical length have been used
SIR resonators.It can make differential mode harmonics frequency in 5.5f by adjusting impedance ratio0Place, common mode operation is in 3.43f0Place.Due to four
Individual SIR resonators arrange in CQ, during differential mode response mainly determines that path a-a introduces intersection by coupling path resonator a-b-b-a
Coupling, two transmission zeros can be produced in differential mode.Response is mainly determined that the minor matters at tap can produce by path a-a during common mode
Transmission zero so that common mode inhibition to 6.176f0.The advantages of this method design is that size is small, selectivity is high.Shortcoming is larger
Pass band insertion loss, reach 3.5dB.
From being analyzed above it is recognized that while existing structure can realize high common mode inhibition or high selectivity or loss, but simultaneously
Possesses the difficult point that high selectivity, high common mode inhibition, low-loss more transmission zero balance filters are still design.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of high selectivity, high common mode inhibition, low differential loss
Using coupling feed load more transmission zero balance filters.
To achieve the above object, technical scheme provided by the present invention is：A kind of more transmission loaded using coupling feed
Zero balance wave filter, include the first Differential Input port and the second Differential Input port of specular, specular
First minor matters of the first difference output port and the second difference output port and specular load toroidal cavity resonator and second
Section loading toroidal cavity resonator；Wherein, the first Differential Input port and the second Differential Input port, the first difference output port
The same symmetry axis of toroidal cavity resonator is loaded with the second difference output port, the first minor matters loading toroidal cavity resonator and the second minor matters,
The first Differential Input port cascade has the first impedance transformation line, and the second Differential Input port cascade has the second impedance change
Thread-changing, the first difference output port level are associated with the 3rd impedance transformation line, and the second difference output port level is associated with the 4th
Impedance transformation line, the first impedance transformation line and the distribution of the second impedance transformation line specular, the 3rd impedance transformation line
It is distributed with the 4th impedance transformation line specular, the first impedance transformation line and the second impedance transformation line, the 3rd impedance conversion
Line and the 4th impedance transformation line and above-mentioned first Differential Input port and the second same symmetry axis in Differential Input port, described first
Impedance transformation line is loaded with the first feeder line, and the 3rd impedance transformation line is loaded with the second feeder line, the first minor matters loaded ring
The toroidal cavity resonator part of shape resonator is located in the region that the first feeder line and the second feeder line surround, and respectively with first feeder line
Coupled with the second feeder line, the second impedance transformation line is loaded with the 3rd feeder line, and the 4th impedance transformation line is loaded with the 4th
Feeder line, the toroidal cavity resonator part of the second minor matters loading toroidal cavity resonator are located at the area that the 3rd feeder line and the 4th feeder line surround
In domain, and coupled respectively with the 3rd feeder line and the 4th feeder line, first is loaded between first feeder line and the 3rd feeder line
Section, the second minor matters and the 3rd minor matters for being loaded with specular between second feeder line and the 4th feeder line and being connected are described
Grounded metal via was provided between second minor matters and the 3rd minor matters, and it is defeated with above-mentioned first Differential Input port and the second difference
The loading minor matters of the same symmetry axis of inbound port, the first minor matters loading toroidal cavity resonator and the second minor matters loading toroidal cavity resonator
Part is in the region that first minor matters, the second minor matters, the 3rd minor matters surround.
The loading minor matters part of first minor matters loading toroidal cavity resonator and the second minor matters loading toroidal cavity resonator by
Two sections of minor matters compositions, it is T-shaped.
The present invention compared with prior art, has the following advantages that and beneficial effect：
1st, compared with existing common mode inhibition implementation method, the coupling feed loading structure of the invention used can be in common mode
When produce multiple transmission zeros.Realize the common mode inhibition of feed end.Differential mode and common mode characteristic can separately be designed, design is only
Vertical, easy, common mode inhibition is significantly improved.
2nd, compared with existing balance filter high selectivity implementation method, the coupling feed loading structure of the invention used
The selectivity outside differential mode passband band can be improved in differential mode passband to produce multiple transmission zeros.
3rd, the scheme proposed by the present invention based on coupling feed loading structure and minor matters loading toroidal cavity resonator, can be in passband
Three transmission poles are formed, differential mode pass-band loss is reduced while improving selective.
4th, the minor matters for the minor matters loading toroidal cavity resonator that the present invention uses use two sections of T-type structures, can be in common mode and differential mode
Passband is the extra transmission zero of generation, hence it is evident that improves the abruptness and common mode inhibition effect of differential mode.
5th, the balance filter that the present invention designs is provided simultaneously with high selectivity, high common mode inhibition, low-loss advantage, simultaneously
Using planar structure, cost is low, and characteristic is good, easy of integration.
Brief description of the drawings
Fig. 1 is the structure chart of more transmission zero balance filters of the present invention using coupling feed loading.
Fig. 2 is medium substrate schematic diagram used in the present invention.
Fig. 3 a are the differential mode equivalent circuit of more transmission zero balance filters of the present invention using coupling feed loading
Figure.
Fig. 3 b are the common mode equivalent circuit of more transmission zero balance filters of the present invention using coupling feed loading
Figure.
Fig. 4 loads minor matters Z to whether there is1When differential-mode characteristic curve map (Z2=92 Ω, Z3=44 Ω, Zoo=85 Ω, Zoe=
185Ω)。
Fig. 5 is different loading minor matters Z1When differential-mode characteristic curve map.
Fig. 6 realizes the response diagram under situation for two kinds of differences.
Fig. 7 a are to respond experimental result using the differential mode narrow-band of more transmission zero balance filters of coupling feed loading
Figure.
Fig. 7 b are the differential mode broadband response experimental result using more transmission zero balance filters of coupling feed loading
Figure.
Fig. 7 c are the common-mode response experimental result picture using more transmission zero balance filters of coupling feed loading.
Fig. 8 is the modified minor matters cable architecture wideband balance filter graph architecture of Lei Zhu team in background technology.
Fig. 9 is the coupling minor matters wideband balance filter graph architecture of Q X Chu team in background technology.
Figure 10 is the parallel coupling minor matters constitutional balance filter graph architecture of W Q Che team in background technology.
Figure 11 is the cascade quadravalence balance electric filter structure figure of W Q Che team in background technology.
Embodiment
With reference to specific embodiment, the invention will be further described.
As shown in figure 1, the more transmission zero balance filters loaded using coupling feed described in the present embodiment, are included
First Differential Input port A of specular1With the second Differential Input port B1, the first difference output port A of specular4
With the second difference output port B4And the first minor matters loading toroidal cavity resonator and the second minor matters loading annular resonance of specular
Device；Wherein, the first Differential Input port A1With the second Differential Input port B1, the first difference output port A4It is poor with second
Divide output port B4, the first minor matters loading toroidal cavity resonator and the second minor matters loading the same symmetry axis of toroidal cavity resonator, Jun Yanshui
Horizontal line OO ' is symmetrical；The first Differential Input port A1Level is associated with the first impedance transformation line A2, second Differential Input
Port B1Level is associated with the second impedance transformation line B2, the first difference output port A4Level is associated with the 3rd impedance transformation line A3, it is described
Second difference output port B4Level is associated with the 4th impedance transformation line B3, the first impedance transformation line A2With the second impedance transformation line
B2Specular is distributed, the 3rd impedance transformation line A3With the 4th impedance transformation line B3Specular is distributed, first impedance
Transformation line A2With the second impedance transformation line B2, the 3rd impedance transformation line A3With the 4th impedance transformation line B3It is defeated with above-mentioned first difference
Inbound port A1With the second Differential Input port B1Same symmetry axis, the first impedance transformation line A2The first feeder line is loaded with, it is described
3rd impedance transformation line A3It is loaded with the second feeder line, the toroidal cavity resonator part A of the first minor matters loading toroidal cavity resonator9Position
In the region that the first feeder line and the second feeder line surround, and couple, be respectively formed with first feeder line and the second feeder line respectively
Coupling feed A5、A6, the second impedance transformation line B2It is loaded with the 3rd feeder line, the 4th impedance transformation line B3It is loaded with
Four feeder lines, the toroidal cavity resonator part B of the second minor matters loading toroidal cavity resonator9Surrounded positioned at the 3rd feeder line and the 4th feeder line
Region in, and coupled respectively with the 3rd feeder line and the 4th feeder line, be respectively formed with coupling feed B5、B6, first feeder line
And the 3rd be loaded with the first minor matters C between feeder line1, specular is loaded between second feeder line and the 4th feeder line and is connected
The the second minor matters C connect2With the 3rd minor matters C3, the second minor matters C2With the 3rd minor matters C3Between be provided with grounded metal via C4,
And with above-mentioned horizontal line OO ' be symmetry axis, it is described to cross grounded metal via C4On horizontal line OO ', first minor matters
The loading minor matters part of loading toroidal cavity resonator and the second minor matters loading toroidal cavity resonator is located at first minor matters C1, the second minor matters
C2, the 3rd minor matters C3In the region surrounded；The loading minor matters part of the first minor matters loading toroidal cavity resonator is by two sections of minor matters
A7、A8Composition, T-shaped, wherein A7To load minor matters vertical portion, A8To load minor matters horizontal component；The second minor matters loading
The loading minor matters part of toroidal cavity resonator is by two sections of minor matters B7、B8Composition, T-shaped, wherein B7To load minor matters vertical portion, B8
To load minor matters horizontal component.
The minor matters A of loading7Impedance be Z2, the minor matters A of loading8For 2Z2, A7Length and half A8Total electrical length of length is
θ0.The minor matters B of loading7Impedance be Z2, the minor matters B of loading8For 2Z2, B7Length and half B8Total electrical length of length is θ0.Branch
Section loading toroidal cavity resonator and feeder line coupling unit (A5、B5、A6、B6) even odd mould impedance be respectively Zoo/Zoe, electrical length is
θ0.The minor matters C of coupling feed end loading2And C3Electrical length is θ0, the minor matters C of loading1Electrical length is 2 θ0.Input, delivery outlet level
Impedance transformation line (the A of connection2、B2、A3、B3) electrical length is θ0, impedance Z3。
Because whole wave filter is symmetrical along horizontal line OO ', differential mode and common mode equivalent can be used to analyze.It is horizontal during differential mode
Line OO ' is equivalent to an electric wall, is equivalent to short circuit, and its equivalent circuit is shown in Fig. 3 a.The minor matters loading annular that the structure uses
Resonator is in fact a singlemode resonance device, but passband is due to coupling feed (A5、B5、A6、B6) cross-couplings and possess three
Individual transmission pole.Therefore by controlling the impedance (Z of coupling lineoe、Zoo) bandwidth of passband can be controlled.Input, delivery outlet cascade
The impedance transformation line Z of four/wavelength3Ripple level can further be improved.On the other hand, minor matters are loaded and are realizing balance filter
Ripple device differential mode can improve pass-band performance while equivalent.As shown in Figure 4, when coupling feed does not load short-circuit minor matters Z1When, band
Only two transmission zeros outside.And three transmission poles are remained as after loading short-circuit minor matters, in band, but can produce 6 biographies with outer
Defeated zero point, substantially improve the abruptness of passband.And loading minor matters impedance is smaller, passband selectivity is more precipitous.
Similarly, when common mode encourages, OO ' is equivalent to open a way, and common mode equivalent circuit is as shown in Figure 3 b.Now wave filter feeder line point
It Jia Zai not open a way and short-circuit minor matters.As shown in figure 5, wave filter has just had well when coupling feed does not load minor matters
Common mode inhibition.As loading minor matters Z1Afterwards, equally can be with two extra transmission zeros of outer increase, it will be apparent that strengthen common mode resistance
The inhibition of band.
When physical size is realized, we employ practical structures as shown in Figure 1, i.e., resonator are loaded into minor matters (Z2, θ0)
It is separated into (A7、A8) two sections or (B7、B8) two sections of compositions, it is T-shaped.So do one obviously advantage be that can produce introducing
Coupling path, produce extra transmission zero.Simulated effect, wherein feelings during different implementations when giving differential mode such as Fig. 6
Shape 1 is θ to be loaded directly into length0, impedance Z2Wide minor matters, situation two be invention used by structure.Adopted it can be seen that working as
During with the structure of invention, extra transmission zero is generated at high sideband, it is evident that the echo for improving differential mode passband damage
Consumption and selectivity.Similarly, extra transmission zero can be also generated during common mode at high sideband.
The medium substrate that this example uses, its relative dielectric constant are 2.55, thickness 0.8mm, and loss angle tangent is
0.029.As shown in Fig. 2 D1To use the upper strata metal patch of dielectric-slab, D2For dielectric layer, D3For dielectric-slab lower floor grounded metal
Paster, D4For ground via.
It is 2.4GHz that this example, which designs and machined a frequency, and three dB bandwidth is 19% arrowband balance filter.Wave filter
Circuit parameter be respectively：Z1=110 Ω, Z2=92 Ω, Z3=44 Ω, Zoo=85 Ω, Zoe=185 Ω, θ0=θ1=θ2=θ3
=90 °, its size is 0.63 λg×0.7λg.Experimental result is as shown in Fig. 7 a, 7b, 7c.When differential mode works, measure (Electromagnetic Simulation)
Centre frequency be 2.407 (2.39) GHz, 3dB relative bandwidths are 17% (18.7%), are 1 (0.3) dB with interior minimum Insertion Loss.
Measure frequency be 0.9,1.98,2.67,2.98,3.685,4.6,5.68,6.55GHz (0.87,1.96,2.64,2.9,3.5,
4.53rd, 5.72,6.73GHz) place produces 8 transmission zeros.(Electromagnetic Simulation) is measured all in the range of 2.75-6.78GHz to distinguish
Reach 16dB (18dB dB) Out-of-band rejection.During common mode operation measurement frequency be 1.44,2.33,3.13,4.3,4.93,
6.2nd, 7 transmission zeros are produced at 7.35GHz, common mode has all reached more than 18.8dB suppression level in 0-6.5GHz.Survey
Amount and Electromagnetic Simulation common mode and differential mode at 2.67GHz all generate a transmission zero, are because resonator loading minor matters are drawn
Enter coupling path generation.It can be seen that zero point make it that selectivity is improved at this, while improve common mode inhibition level.The filter
The advantage of ripple device is more common modes and differential mode transmission zero point, and shows higher selectivity and common mode inhibition.
Examples of implementation described above are only the preferred embodiments of the invention, and the implementation model of the present invention is not limited with this
Enclose, therefore the change that all shape, principles according to the present invention are made, it all should cover within the scope of the present invention.
Claims (2)
- A kind of 1. more transmission zero balance filters loaded using coupling feed, it is characterised in that：Include specular First Differential Input port and the second Differential Input port, the first difference output port and the second difference output end of specular First minor matters of mouth and specular loading toroidal cavity resonator and the second minor matters loading toroidal cavity resonator；Wherein, described first is poor Divide input port and the second Differential Input port, the first difference output port and the second difference output port, the loading of the first minor matters Toroidal cavity resonator and the second minor matters loading same symmetry axis of toroidal cavity resonator, the first Differential Input port cascade have the first resistance Resistance thread-changing, the second Differential Input port cascade have the second impedance transformation line, and the first difference output port level is associated with 3rd impedance transformation line, the second difference output port level are associated with the 4th impedance transformation line, the first impedance transformation line and Second impedance transformation line specular is distributed, the 3rd impedance transformation line and the distribution of the 4th impedance transformation line specular, institute State the first impedance transformation line and the second impedance transformation line, the 3rd impedance transformation line and the 4th impedance transformation line and above-mentioned first difference Input port and the second same symmetry axis in Differential Input port, the first impedance transformation line are loaded with the first feeder line, and described Three impedance transformation lines are loaded with the second feeder line, and the toroidal cavity resonator part of the first minor matters loading toroidal cavity resonator is located at first In the region that feeder line and the second feeder line surround, and coupled respectively with first feeder line and the second feeder line, the second impedance conversion Line is loaded with the 3rd feeder line, and the 4th impedance transformation line is loaded with the 4th feeder line, and second minor matters load toroidal cavity resonator Toroidal cavity resonator part be located in the region that the 3rd feeder line and the 4th feeder line surround, and respectively with the 3rd feeder line and the 4th present Line is coupled, and the first minor matters are loaded between first feeder line and the 3rd feeder line, is added between second feeder line and the 4th feeder line The second minor matters and the 3rd minor matters for being loaded with specular and being connected, ground connection was provided between second minor matters and the 3rd minor matters Metallic vias, and add with above-mentioned first Differential Input port and the second same symmetry axis in Differential Input port, first minor matters The loading minor matters part for carrying toroidal cavity resonator and the second minor matters loading toroidal cavity resonator is located at first minor matters, the second minor matters, the In the region that three minor matters surround.
- 2. a kind of more transmission zero balance filters loaded using coupling feed according to claim 1, its feature are existed In：The loading minor matters part of the first minor matters loading toroidal cavity resonator and the second minor matters loading toroidal cavity resonator is by two sections of branches Section composition, it is T-shaped.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201342704A (en) * | 2012-04-13 | 2013-10-16 | Univ Chienkuo Technology | Balanced type common mode signal suppression dual frequency bandpass filter designed by T type and lambda/2 stepp impedance resonator (SIR) |
| CN203760599U (en) * | 2014-03-28 | 2014-08-06 | 南京航空航天大学 | Compact type ultra wide band double-band-notch balance band-pass filter |
| CN204651445U (en) * | 2015-05-26 | 2015-09-16 | 华南理工大学 | A kind of many transmission zeros balance filter adopting coupling feed to load |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201342704A (en) * | 2012-04-13 | 2013-10-16 | Univ Chienkuo Technology | Balanced type common mode signal suppression dual frequency bandpass filter designed by T type and lambda/2 stepp impedance resonator (SIR) |
| CN203760599U (en) * | 2014-03-28 | 2014-08-06 | 南京航空航天大学 | Compact type ultra wide band double-band-notch balance band-pass filter |
| CN204651445U (en) * | 2015-05-26 | 2015-09-16 | 华南理工大学 | A kind of many transmission zeros balance filter adopting coupling feed to load |
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