CN104882650B - A kind of balance filter that resonator is loaded using coupling minor matters - Google Patents
A kind of balance filter that resonator is loaded using coupling minor matters Download PDFInfo
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- CN104882650B CN104882650B CN201510275815.5A CN201510275815A CN104882650B CN 104882650 B CN104882650 B CN 104882650B CN 201510275815 A CN201510275815 A CN 201510275815A CN 104882650 B CN104882650 B CN 104882650B
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Abstract
The invention discloses a kind of balance filter that resonator is loaded using coupling minor matters, including first, second symmetrical filter cell；First filter cell includes the first coupling minor matters loading resonator, first and second input/output port；First coupling minor matters loading resonator is made up of first and second transmission line of the first coupling minor matters and cascade, first input/output port is connected to the 3rd transmission line, and first, second and third minor matters are loaded with, the second input/output port is connected to the 4th transmission line, and is loaded with the 4th minor matters；Second filter cell includes the second coupling minor matters loading resonator, third and fourth input/output port；Second coupling minor matters loading resonator is made up of the five, the 6th transmission lines of the second coupling minor matters and cascade, 3rd input/output port is connected to the 7th transmission line, and the 5th minor matters are loaded with, the 4th input/output port is connected to the 8th transmission line, and is connected with the 4th minor matters.The present invention is applicable the design of the high common mode inhibition balance filter of high selectivity.
Description
Technical field
The present invention relates to the technical field of microwave communication, a kind of balance that resonator is loaded using coupling minor matters is referred in particular to
Wave filter.
Background technology
Balance filter has obtained people since the proposition and more and more paid close attention to, and existing different structures meet different at present
Demand.Comprehensive designing method based on bandstop filter and bandpass filter, although broadband can be realized, but design more complicated,
It is difficult to high selectivity.Some other balanced structure from height common mode inhibition, such as slot line structure, signal interference structure etc.
Due to being difficult to introduce transmission zero outside in band, passband selectivity ratios are shallower.Method based on multimode resonator is design broadband
An effective way, filter order can be improved, high selectivity and miniaturization is realized.But apply in balance filter
Multimode resonator design it is relatively fewer, therefore, study multimode broadband balance filter, design RF/Microwave communication frequency
The high precipitous type balance filter of section has extremely important theory significance, great economic benefit and wide application prospect.
Balance filter is most basic to be achieved in that using minor matters loading structure as representative.Realized by increasing minor matters number
Wider bandwidth, has the disadvantage that the selectivity of differential mode passband is poor, common mode bandwidth of rejection is limited, size is larger.Therefore, some are improved
Type scheme is suggested, and such as 2013 Chu Qing sunrises team of South China Science ＆ Engineering University are in IEEE Microwave and Wireless
Entitled " the Differential Wideband Bandpass Filter With High- that Components Letters are delivered
In Selectivity and Common-Mode Suppression " articles, as shown in Figure 7.By using coupling minor matters line and
Minor matters loading technique is coupled, the size of wave filter is greatly reduced, selectively greatly improved.But this structure common mode inhibition is still needed to
Improve.
Principle based on the two anti-phase suppression of path signal in-phase stacking can equally realize preferable common mode inhibition, such as Q
Entitled " the A Novel Ultra- that Xue is delivered in IEEE Microwave and Wireless Components Letters
Wideband Differential Filter Based on Double-Sided Parallel-Strip Line " text
Chapter, as shown in Figure 8.When the Signal averaging of two paths, if meeting condition θpath1(f0)=θpath2(f0) ± 2n π and θpath1
(f0)=θpath2(f0) ± n π, when (n=1,2,3 ...), a passband and stopband will be produced respectively.Based on putting down that this method is designed
Weighed wave filter, and its common-mode signal can be suppressed in whole frequency range, but its differential mode passband is due to no transmission zero
Sideband characteristic is poor.
Another method for realizing balance filter is to use multimode micro-strip resonantor, and W Q Che. exist within such as 2012
Entitled " the Novel Wideband that IEEE Transactions on Microwave Theory and Techniques are delivered
Differential Bandpass Filters Based on T-Shaped Structure " articles, as shown in Figure 9.It is T-shaped
Three modes of resonance of resonator form differential mode passband, while introducing transmission zero during common mode at centre frequency, realize altogether
Mould suppresses.The advantage of this structure is that common mode inhibition scope covers whole frequency band, and size is smaller.But selectivity still needs to change
It is kind.
Equally, multimode line of rabbet joint resonator can be used for the design of balance filter, and for example Chen C J are in IEEE
Entitled " the Band-notched balanced UWB that Microwave and Wireless Components Letters are delivered
BPF with stepped-impedance slotline multi-mode resonator " articles, as shown in Figure 10.Pass through
Line of rabbet joint step electric impedance resonator can realize multimode ultra wide band characteristic.The line of rabbet joint will not transmit common mode letter at the plane of symmetry during due to common mode
Number, whole frequency band common mode all reaches fine suppression.In addition coupled by source-load, two transmission zeros can be produced outside passband, selected
Selecting property is improved.
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 using the flat of coupling minor matters loading resonator
Weigh wave filter, overcomes the problem of existing multimode resonator difficulty realizes transmission zero, it is proposed that a kind of multimode resonator so that poor
Multimode resonator is producing multiple transmission zeros with outer during mould, and transmission zero is controllable, and in common mode, the multimode resonator meeting
Transmission zero is produced in passband；Used when overcoming the existing multistage balance filter to realize the problem of high differential loss there is provided one kind
The design of multimode resonator；Balance filter common mode inhibition is overcome to realize difficult point, using a kind of common mode inhibition feed structure,
So that the design of wave filter is concentrated in the realization of differential mode passband；Overcome the difficult point realized compared with high selectivity high steep there is provided one kind
The implementation of the high and steep high common mode inhibition balance filter of property.
To achieve the above object, technical scheme provided by the present invention is：It is a kind of to load resonator using coupling minor matters
Balance filter, includes the first filter cell and the second filter cell of specular distribution, wherein, first filter
Ripple device unit includes the first coupling minor matters loading resonator, the first input/output port, the second input/output port, described the
One coupling minor matters loading resonator is made up of the first transmission line and the second transmission line of the first coupling minor matters and cascade, and described first
Transmission line and the second transmission line are parallel to the first filter cell and the symmetry axis of the second filter cell, the first coupling branch
Section is connected with the first transmission line and the second transmission line respectively perpendicular to the symmetry axis, the first input/output port connection
There are the 3rd transmission line, the 3rd transmission line and the first transmission line composition input/output terminal coupling feed, and the coupling feed is loaded
There are the first minor matters, the second minor matters, the 3rd minor matters, second input/output port is connected with the 4th transmission line, the 4th transmission
Line and the second transmission line composition input/output terminal coupling feed, and the coupling feed is loaded with the 4th minor matters；Second filtering
Device unit includes the second coupling minor matters loading resonator, the 3rd input/output port, the 4th input/output port, described second
Coupling minor matters loading resonator is made up of the second coupling minor matters and the 5th transmission line of cascade and the 6th transmission line, and the described 5th passes
Defeated line and the 6th transmission line are parallel to the first filter cell and the symmetry axis of the second filter cell, the second coupling minor matters
Perpendicular to the symmetry axis, its one end is connected with the 5th transmission line and the 6th transmission line respectively, and its other end is coupled with above-mentioned first
Minor matters are connected, and the 3rd input/output port is connected with the 7th transmission line, and the 7th transmission line constitutes defeated with the 5th transmission line
Enter output end coupling feed, and the coupling feed is loaded with the 5th minor matters, one end and the 7th transmission line of the 5th minor matters connect
Connect, the one end of its other end respectively with above-mentioned first minor matters, the second minor matters is connected, and the other end of first minor matters is connected to the 3rd
Transmission line, the other end of second minor matters is connected to the center of above-mentioned 3rd minor matters, first minor matters and the 5th minor matters mirror image
Symmetrically, and with the first filter cell and the same symmetry axis of the second filter cell, second minor matters prolong on the symmetry axis
Stretch, the 3rd minor matters are perpendicular to the symmetry axis, and the 4th input/output port is connected with the 8th transmission line, the 8th transmission
Line and the 6th transmission line constitute input/output terminal coupling feed, and the coupling feed is connected with above-mentioned 4th minor matters.
4th minor matters are formed by connecting by the transmission line of two sections of speculars, and two sections of transmission lines and the first wave filter
Unit and the same symmetry axis of the second filter cell.
The first coupling minor matters and the second coupling minor matters are short circuit coupling minor matters or open circuit coupling minor matters.
First minor matters, the second minor matters, the 3rd minor matters, the 4th minor matters, the 5th minor matters are short-circuit minor matters or open circuit minor matters.
First input/output port, the second input/output port, the 3rd input/output port, the 4th input/output terminal
Mouth is the Ω of impedance 50 transmission line.
The present invention compared with prior art, has the following advantages that and beneficial effect：
1st, compared with existing multimode resonator structure, coupling minor matters loading resonator of the invention can be produced outside differential mode band
Raw multiple transmission zeros, and transmission zero is controllable.And in common mode, the multimode resonator can produce transmission zero in passband.
2nd, compared with existing multistage balance filter implementation method, coupling minor matters loading resonator design side of the invention
Case, can be obviously improved passband differential loss.
3rd, compared with existing feed structure, the coupling feed minor matters loading structure of use can introduce two biographies in differential mode band
Defeated limit, realizes multistage broadband.The structure can introduce multiple transmission zeros in common mode simultaneously, hence it is evident that improve common mode inhibition effect.
4th, compared with existing balance filter high selectivity implementation method, the coupling minor matters loading resonance that the present invention is used
Device, realizes high abruptness differential mode passband.
5th, because balance filter of the present invention uses planar horizontal symmetrical structure, cost is low, and characteristic is good, easy of integration, therefore
The present invention is relatively adapted to be integrated into mobile terminal device system.
Brief description of the drawings
Fig. 1 is structural representation of the present invention using the balance filter of coupling minor matters loading resonator.
Fig. 2 is medium substrate schematic diagram used in the present invention.
Fig. 3 a are the differential mode equivalent circuit figure of balance filter of the present invention.
Fig. 3 b are the common mode equivalent circuit figure of balance filter of the present invention.
Fig. 4 a are the curve map that balance filter of the present invention influences in different loadings on differential mode passband.
Fig. 4 b are parameter K1And K2The curve map influenceed on differential mode passband.
Fig. 5 a are curve map of the balance filter of the present invention in different loadings to common-mode influence.
Fig. 5 b are the change curve that balance filter common mode equivalent circuit of the present invention is responded.
Fig. 6 a are balance filter differential-mode response simulated measurement result figure of the present invention.
Fig. 6 b are balance filter common-mode response simulated measurement result figure of the present invention.
Fig. 7 is the coupling minor matters wideband balance filter circuit figure of Chu Qing sunrises team of South China Science ＆ Engineering University in background technology.
The balance band pass filter circuit figure based on multipath that Fig. 8 is Q Xue in background technology.
The balanced filter circuit figure based on multimode resonator that Fig. 9 is W Q Che in background technology.
The balanced filter circuit figure based on line of rabbet joint multimode resonator that Figure 10 is Chen C J in background technology.
Embodiment
With reference to specific embodiment, the invention will be further described.
As shown in figure 1, the balance filter that resonator is loaded using coupling minor matters described in the present embodiment, is included with water
Flat axle OO ' is the first filter cell and the second filter cell that symmetry axis specular is distributed, wherein, first filtering
Device unit includes the first coupling minor matters loading resonator, the first input/output port A1, the second input/output port A2, described
First coupling minor matters loading resonator is made up of the first coupling minor matters A7 and cascade the first transmission line A3 and the second transmission line A4,
The first transmission line A3 and the second transmission line A4 are parallel to the first filter cell and the symmetry axis of the second filter cell, institute
The first coupling minor matters A7 is stated perpendicular to the symmetry axis, and is connected respectively with the first transmission line A3 and the second transmission line A4, described
One input/output port A1 is connected with the 3rd transmission line A5, the 3rd transmission line A5 and the first transmission line A3 composition input/output terminal
Coupling feed, and the coupling feed is loaded with the first minor matters A8, the second minor matters C2, the 3rd minor matters C3, second input and output
Port A2 is connected with the 4th transmission line A6, the 4th transmission line A6 and the second transmission line A4 composition input/output terminal coupling feed,
And the coupling feed is loaded with the 4th minor matters C1；Second filter cell include the second coupling minor matters loading resonator,
3rd input/output port B1, the 4th input/output port B2, the second coupling minor matters loading resonator is by the second coupling branch
Save B7 and the 5th transmission line B3 of cascade and the 6th transmission line B4 to constitute, the 5th transmission line B3 and the 6th transmission line B4 is parallel
In the first filter cell and the symmetry axis of the second filter cell, the second coupling minor matters B7 perpendicular to the symmetry axis, its
One end is connected with the 5th transmission line B3 and the 6th transmission line B4 respectively, and its other end is connected with the above-mentioned first coupling minor matters A7, institute
State the 3rd input/output port B1 and be connected with the 7th transmission line B5, the 7th transmission line B5 and the 5th transmission line B3 composition inputs are defeated
Go out and hold coupling feed, and the coupling feed is loaded with the 5th minor matters B8, one end and the 7th transmission line B5 of the 5th minor matters B8
Connection, the one end of its other end respectively with above-mentioned first minor matters A8, the second minor matters C2 is connected, and first minor matters A8 other end connects
The 3rd transmission line A5 is connected to, second minor matters C2 other end is connected to above-mentioned 3rd minor matters C3 center, first minor matters
A8 and the 5th minor matters B8 speculars, and with the first filter cell and the same symmetry axis of the second filter cell, described second
Minor matters C2 extends on the symmetry axis, and the 3rd minor matters C3 is perpendicular to the symmetry axis, and the 4th input/output port B2 connects
It is connected to the 8th transmission line B6, the 8th transmission line B6 and the 6th transmission line B4 composition input/output terminal coupling feed, and the coupling
Feeder line is connected with above-mentioned 4th minor matters C1；The 4th minor matters C1 is formed by connecting by the transmission line of two sections of speculars, and this two
Section transmission line and the first filter cell and the same symmetry axis of the second filter cell.First input/output port, second
Input/output port, the 3rd input/output port, the 4th input/output port are the Ω of impedance 50 transmission line；First coupling
It is short circuit coupling minor matters or open circuit coupling minor matters to close the coupling minor matters B7 of minor matters A7 and second；The first minor matters A8, the second minor matters
C2, the 3rd minor matters C3, the 4th minor matters C1, the 5th minor matters B8 are short-circuit minor matters or open circuit minor matters.Define feeder line the coefficient of coup be
K1=(Zoe1-Zoo1)/(Zoe1+Zoo1), the coefficient of coup for defining the coupling minor matters of resonator loading is K2=(Zoe2-Zoo2)/(Zoe2
+Zoo2)。
Because the structure level of the present invention is symmetrical, when differential mode and common mode operation, the plane of symmetry OO ' of wave filter is equivalent to respectively
One preferably electric wall and Ci Bi, the plane of symmetry are equivalent to short circuit and open circuit respectively, its differential mode and common mode equivalent circuit such as Fig. 3 a with
Shown in Fig. 3 b.
When the die worker that is on duty makees, as shown in Figure 3 a, wave filter is loaded by short circuit coupling minor matters loading resonator and short-circuit minor matters
Coupling feed cascade form.Short circuit coupling minor matters loading resonator can form the logical of three transmission poles and dual transfer zero
Band, as shown in fig. 4 a.After coupling feed loads short-circuit minor matters, two extra transmission poles are added in band.And load short
The impedance Z s of road minor matters diminishes, and abruptness improves, and band is also preferably suppressed outside.Fig. 4 b depict differential mode pass-band performance and coupling
Close COEFFICIENT K1、K2Relation curve.It can be seen that K2Bigger, pass band width is wider.Meanwhile, work as K2It is constant, feeder line coupling parameter K1Then may be used
For adjusting the ripple level in band.
When common mode operation, as shown in Figure 3 b, wave filter is by opening that open circuit coupling minor matters loading resonator and two are loaded
The coupling feed cascade of road minor matters is formed.Because the resonator of open circuit coupling minor matters loading can be in centre frequency fodd1Produce resonance
And transmission zero, as shown in Figure 5 a, its common mode inhibition effect are limited.When coupling feed all loads the open circuit minor matters of four/wavelength
When, coupling feed is also in fodd1Place produces transmission zero so that common mode inhibition level is improved.When coupling feed loads four points respectively
Wavelength and half-wavelength open circuit minor matters when, common mode can be in 0-2fodd1Two extra transmission zeros of interior increase so that common mode inhibition
Effect is more preferable.Fig. 5 b depict relation curve of the coupling feed to common-mode response of circuit simulation.It can be seen that transmission zero is not
By coupling feed odd mode impedance Zoo1With loading minor matters impedance ZsInfluence, ZsSmaller or Zoo1Bigger, common mode inhibition effect is got over
It is good.
This structure implements to have transmission line in generality, such as Fig. 1 structures can use the structures such as microstrip line, strip line, such as
Coupled transmission line shown in A7, A8 can be realized with two-wire, three lines or multi-thread coupled transmission line.Microstrip structure, three wire configuration are only
It is the structure used when the present embodiment is implemented.Example structure is as shown in figure 1, the micro-strip medium substrate such as Fig. 2 used
It is shown, D1To use the upper strata metal patch of dielectric-slab, D2For dielectric layer (its relative dielectric constant is 2.55, and thickness is 0.8mm,
Loss angle tangent is 0.029) D3For dielectric-slab lower floor grounded metal paster.
When the wave filter is designed, it is first determined working frequency f0=fodd1, while making θ1=90 ° of@f0.According to bandwidth requirement
K can be determined2.According to return loss, parameter K1, Zoo1And Zoo2For controlling transmission pole in passband to realize more flat ripple water
It is flat.For suppression common mode, θ is determinedSCome controlling transmission the Distribution of Zeros, the suitable Z of simultaneous selectionS。
A frequency is 3.7GHz, and 3-dB is designed with a width of 30% balance filter.Its size is 0.6 λg×
0.57λg(λgCentered on waveguide wavelength at frequency), circuit parameter is respectively K2=0.264, K1=0.32, Zoo2=74.4 Ω,
Zoo1=71 Ω, Zs=88.3 Ω, θ1=90 °, θs=90 °.In order to avoid being coupled between resonator and loading minor matters, folding is employed
Structure, while resonator uses three interdigital coupling lines.Fig. 6 a and Fig. 6 b give the emulation and measurement pair of balance filter this example
Compare result.When differential mode works, the centre frequency of measurement (Electromagnetic Simulation) is 3.65 (3.7) GHz, and 3dB relative bandwidths are 31%
(30%) it is, 1.1dB (0.3dB) with interior minimum Insertion Loss.It is that 3/4.3GHz (3.1/4.28GHz) place produces 2 to measure in frequency
Transmission zero so that passband Δ f3db/Δf20dbReach 0.97 (0.978).Measurement and emulation (circuit and electromagnetism) are all in 4.7-
7GHz respectively reaches 20dB (13.5dB) Out-of-band rejection.Emulation is due to even mould harmonic wave f in 7.5GHz harmonic waveeven1Shadow
Ring.It is 2.27/3.73/6.3/7.22GHz (2.29/3.7/6.03/ that (Electromagnetic Simulation) is measured during common mode operation in frequency
7.3GHz) place produces 4 transmission zeros, and common mode all realizes more than 20dB suppression level in 1-6.9GHz.Measurement and electricity
There is a small amount of deviation in magnetic emulation, the coupling mainly due to coupling feed resonator minor matters causes, in addition machining accuracy, medium
Error can be also produced with SMA losses.
From examples detailed above it can be seen that, it is proposed by the present invention using coupling minor matters load resonator balance filter, tool
There is very high precipitous type, the design of the high common mode inhibition balance filter of high selectivity is applicable, with important research and engineering
Practical value, is worthy to be popularized.
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 (5)
1. a kind of balance filter that resonator is loaded using coupling minor matters, it is characterised in that：Include specular distribution
First filter cell and the second filter cell, wherein, first filter cell includes the loading of the first coupling minor matters
Resonator, the first input/output port, the second input/output port, the first coupling minor matters loading resonator is by the first coupling
Minor matters and the first transmission line of cascade and the second transmission line are constituted, and first transmission line and the second transmission line are parallel to the first filter
The symmetry axis of ripple device unit and the second filter cell, the first coupling minor matters are perpendicular to the symmetry axis, and respectively with first
Transmission line and the connection of the second transmission line, first input/output port are connected with the 3rd transmission line, the 3rd transmission line and the
One transmission line constitutes input/output terminal coupling feed, and the coupling feed is loaded with the first minor matters, the second minor matters, the 3rd minor matters,
Second input/output port is connected with the 4th transmission line, the 4th transmission line and the second transmission line composition input/output terminal coupling
Feeder line is closed, and the coupling feed is loaded with the 4th minor matters；It is humorous that second filter cell includes the loading of the second coupling minor matters
Shake device, the 3rd input/output port, the 4th input/output port, and the second coupling minor matters loading resonator is by the second coupling branch
Section and the 5th transmission line and the 6th transmission line of cascade are constituted, and the 5th transmission line and the 6th transmission line are parallel to the first filtering
The symmetry axis of device unit and the second filter cell, the second coupling minor matters are perpendicular to the symmetry axis, and its one end is respectively with the
Five transmission lines and the connection of the 6th transmission line, its other end are connected with the above-mentioned first coupling minor matters, the 3rd input/output port
It is connected with the 7th transmission line, the 7th transmission line and the 5th transmission line composition input/output terminal coupling feed, and the coupling feed
Be loaded with the 5th minor matters, one end of the 5th minor matters is connected with the 7th transmission line, its other end respectively with above-mentioned first minor matters,
One end connection of second minor matters, the other end of first minor matters is connected to the 3rd transmission line, the other end connection of second minor matters
In the center of above-mentioned 3rd minor matters, first minor matters and the 5th minor matters specular, and with the first filter cell and second
The same symmetry axis of filter cell, second minor matters extend on the symmetry axis, the 3rd minor matters perpendicular to the symmetry axis,
4th input/output port is connected with the 8th transmission line, the 8th transmission line and the 6th transmission line composition input/output terminal coupling
Feeder line is closed, and the coupling feed is connected with above-mentioned 4th minor matters.
2. a kind of balance filter that resonator is loaded using coupling minor matters according to claim 1, it is characterised in that：Institute
The 4th minor matters are stated to be formed by connecting by the transmission line of two sections of speculars, and two sections of transmission lines and the first filter cell and second
The same symmetry axis of filter cell.
3. a kind of balance filter that resonator is loaded using coupling minor matters according to claim 1, it is characterised in that：Institute
It is short circuit coupling minor matters or open circuit coupling minor matters to state the first coupling minor matters and the second coupling minor matters.
4. a kind of balance filter that resonator is loaded using coupling minor matters according to claim 1, it is characterised in that：Institute
It is short-circuit minor matters or open circuit minor matters to state the first minor matters, the second minor matters, the 3rd minor matters, the 4th minor matters, the 5th minor matters.
5. a kind of balance filter that resonator is loaded using coupling minor matters according to claim 1, it is characterised in that：Institute
The first input/output port, the second input/output port, the 3rd input/output port, the 4th input/output port are stated for impedance 50
Ω transmission line.
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| CN108879043B (en) * | 2018-06-26 | 2024-04-12 | 井冈山大学 | Three-mode balance filter adopting coupling branch loading slot line resonance structure |
| CN111355019B (en) * | 2018-12-24 | 2023-03-24 | 北京小米移动软件有限公司 | Terminal device |
| CN115425377B (en) * | 2022-09-29 | 2023-09-08 | 河南科技大学 | Double-passband balance filter based on loading of ring resonator |
Citations (3)
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|---|---|---|---|---|
| CN102280678A (en) * | 2011-05-27 | 2011-12-14 | 华南理工大学 | Balanced radio frequency electrically tunable bandpass filter with constant relative bandwidth |
| CN102324599A (en) * | 2011-05-27 | 2012-01-18 | 华南理工大学 | Balanced type radio frequency voltage tunable bandpass filter with constant absolute bandwidth |
| CN204651446U (en) * | 2015-05-26 | 2015-09-16 | 华南理工大学 | A kind of balance filter adopting coupling minor matters to load resonator |
-
2015
- 2015-05-26 CN CN201510275815.5A patent/CN104882650B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102280678A (en) * | 2011-05-27 | 2011-12-14 | 华南理工大学 | Balanced radio frequency electrically tunable bandpass filter with constant relative bandwidth |
| CN102324599A (en) * | 2011-05-27 | 2012-01-18 | 华南理工大学 | Balanced type radio frequency voltage tunable bandpass filter with constant absolute bandwidth |
| CN204651446U (en) * | 2015-05-26 | 2015-09-16 | 华南理工大学 | A kind of balance filter adopting coupling minor matters to load resonator |
Non-Patent Citations (1)
| Title |
|---|
| Wideband Balanced Filters With High Selectivityand Common-Mode Suppression;Qing-Xin Chu等;《IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES》;20151031;第63卷(第10期);全文 * |
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