CN204651440U - A kind of line of rabbet joint couple feed band of multifrequency balance filter/duplexer leads to unit - Google Patents
A kind of line of rabbet joint couple feed band of multifrequency balance filter/duplexer leads to unit Download PDFInfo
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- CN204651440U CN204651440U CN201520347823.1U CN201520347823U CN204651440U CN 204651440 U CN204651440 U CN 204651440U CN 201520347823 U CN201520347823 U CN 201520347823U CN 204651440 U CN204651440 U CN 204651440U
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Abstract
The line of rabbet joint couple feed band that the utility model discloses a kind of multifrequency balance filter/duplexer leads to unit, comprises first and second symmetrical differential input and output port pair, first and second symmetrical line of rabbet joint resonator and first and second micro-strip resonantor pair of symmetry; First differential input and output port is to first and second input/output port comprising object, and the first line of rabbet joint resonator and the first differential input and output port are to there is microstrip feed line coupling unit; To comprising third and fourth symmetrical input/output port, between the second line of rabbet joint resonator and the second differential input and output port pair, there is microstrip feed line coupling unit in the second differential input and output port; First micro-strip resonantor is formed by the first micro-strip resonantor and the second micro-strip resonantor, and the second micro-strip resonantor is formed by the 3rd micro-strip resonantor and the 4th micro-strip resonantor.The utility model can realize the independent controlled multifrequency balance filter of high selectivity, high common mode inhibition, frequency and bandwidth and balanced duplexer.
Description
Technical field
The utility model relates to the technical field of microwave communication, and the line of rabbet joint couple feed band referring in particular to a kind of multifrequency balance filter/duplexer leads to unit.
Background technology
The development of microwave and technology for radio frequency, the life of let us is more convenient.But the bottleneck that this technology faces is limited frequency resource.Along with the rise of the communications protocol such as Bluetooth, WiMax, WLAN, 3G, LTE, how to suppress the problems such as the interference between each frequency band, retardance severe all the more.Multiband filter/duplexer is conventional frequency selectivity device, and its performance determines the function of communication system usually, is therefore passive device the most basic in radio communication front end.
On the other hand, communication system processing procedure usually runs into the interference of ambient noise, and noise is the bottlenecks of the minimum signal level that can identify in signal processing.Balancing circuitry, also known as difference channel, for traditional single-end circuit, the most obvious advantage has stronger immunity to ambient noise exactly.Active device (as power amplifier, power splitter, frequency mixer etc.) in Modern Communication System adopts difference port balancing device more and more, if the passive device such as antenna, filter, duplexer also takes this balanced structure in communication system, then can construct a full balancing front-ends system, conveniently can be integrated in (SOCsystem-on-chip) in single-chip, be conducive to common mode inhibition and the miniaturization of improvement system.
Therefore, research multifrequency balance filter, balanced duplexer are theoretical, and the multiband balance filter/duplexer in exploitation radio communication has extremely important theory significance, greatly economic benefit and wide application prospect.
In recent years, people have great interest to the balance filter being applied to radio-frequency front-end microwave frequency band.Lot of domestic and international Research Team, has carried out theory and practice research to balance filter, advances the development of balance filter.But the development of multifrequency balance filter relatively lags behind always.
The people such as Q Xue in 2010 deliver in the article being entitled as " Novel balanced dual-band bandpass filter using coupledstepped-impedance resonators " at IEEE Microwave and Wireless Components Letters, propose to adopt step electric impedance resonator (SIR) to design double frequency balance filter, as shown in fig. lla.Two differential mode passbands can be formed by control SIR impedance ratio; During common mode, plane of symmetry place equivalence open circuit, coupling line is band-stop response.In order to better suppress common mode, plane of symmetry place introduces minor matters and loads.The advantage of this filter is little, the high common mode inhibition of size, filter with low insertion loss, independent controllable frequency.But passband selectivity is not good, bandwidth is not independent controlled.For improving selectivity, this team delivers in the article being entitled as " Dual-Band and Wide-Stopband Single-Band Balanced Bandpass Filters WithHigh Selectivity and Common-Mode Suppression " at IEEE Transactions on Microwave Theory and Techniques, proposition utilizes coupling path, as shown in figure lib.In order to better suppress common mode in the impact of two frequency bands, plane of symmetry place introduces lamped element and loads, and adds the complexity of design processing.
Research for three frequency balance filters is then relatively less.X.W.Shi team delivers in the article being entitled as " Compact BalancedDual-and Tri-band Bandpass Filters Based on Stub Loaded Resonators " at IEEEMicrowave and Wireless Components Letters in 2015, as figure 12 a shows, the resonator design three flat filter frequently adopting racemosus joint to load is proposed, the design of filter is the resonance frequency considering differential mode and common mode, is then separated thus reaches common mode inhibition.Design process is more complicated, passband poor selectivity.
On the other hand, balanced duplexer just progressively obtains the concern of people along with the research of balance sysmte.Only have a small amount of job design balanced duplexer at present, and the work relating to multifrequency duplexer has no report.H.W.Deng etc. deliver in the article being entitled as " Compact Balanced-to-Balanced Microstrip Diplexer With HighIsolation and Common-Mode Suppression " at IEEE Microwave and Wireless Components Letters in 2014, as shown in Figure 12b, propose to adopt half-wave resonator design balance duplexer, structure is introduced source load coupling and is improved passband selectivity, and common mode inhibition is at about 30dB.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, there is provided the line of rabbet joint couple feed band of a kind of multifrequency balance filter/duplexer to lead to unit, realize the independent controlled multifrequency balance filter of high selectivity, high common mode inhibition, frequency and bandwidth and balanced duplexer.
For achieving the above object, technical scheme provided by the utility model is: a kind of line of rabbet joint couple feed band of multifrequency balance filter/duplexer leads to unit, described line of rabbet joint couple feed band lead to the first differential input and output port that unit includes specular to the second differential input and output port pair, the first line of rabbet joint resonator of specular and the first micro-strip resonantor of the second line of rabbet joint resonator and specular to the second micro-strip resonantor pair, wherein, described first differential input and output port to the second differential input and output port pair and the first line of rabbet joint resonator and the same symmetry axis of the second line of rabbet joint resonator, and this symmetry axis perpendicular to the first micro-strip resonantor to the symmetry axis right with the second micro-strip resonantor, described first differential input and output port is to including specular and the first input/output port be connected and the second input/output port, this first input/output port and the second input/output port and the first micro-strip resonantor to the second micro-strip resonantor to same symmetry axis, and described first line of rabbet joint resonator extends on this symmetry axis, and through above-mentioned first differential input and output port pair, and there is microstrip feed line coupling unit between this first differential input and output port pair, described second differential input and output port is to including specular and the 3rd input/output port be connected and the 4th input/output port, 3rd input/output port and the 4th input/output port and the first micro-strip resonantor to the second micro-strip resonantor to same symmetry axis, and described second line of rabbet joint resonator extends on this symmetry axis, and through above-mentioned second differential input and output port pair, and there is microstrip feed line coupling unit between this second differential input and output port pair, described first micro-strip resonantor to the second micro-strip resonantor to being connected, this first micro-strip resonantor is formed by the first micro-strip resonantor of specular and the second micro-strip resonantor, and there is coupling unit in this first micro-strip resonantor and the second micro-strip resonantor, and with the first line of rabbet joint resonator and the same symmetry axis of the second line of rabbet joint resonator, this second micro-strip resonantor is formed by the 3rd micro-strip resonantor of specular and the 4th micro-strip resonantor, and there is coupling unit in the 3rd micro-strip resonantor and the 4th micro-strip resonantor, and with the first line of rabbet joint resonator and the same symmetry axis of the second line of rabbet joint resonator.
Described line of rabbet joint couple feed band leads to the band-pass behavior of unit primarily of parameter f
0, Q
edetermine with K value, can be derived by full-wave simulation:
In formula, f
0, Q
erepresent by following formula with the determination of K:
f
0＝f(L)
K＝f(W,L
s,G
s)
Q
e＝f(W
0,W
1,W,T
1,T
2,T
3)
Wherein, the frequency f of passband
0the length L right by micro-strip resonantor determines; For coupling coefficient K, its parameter is primarily of right coupling unit width W, the coupling length L of micro-strip resonantor
swith coupling space G
sdetermine; External Q is primarily of the width W of microstrip feed line coupling unit
0, line of rabbet joint resonator width W
1, line of rabbet joint resonator location parameter T
1, T
2, T
3and the right width W of micro-strip resonantor is determined.
Compared with prior art, tool has the following advantages and beneficial effect the utility model:
1, compare with balanced duplexer common mode inhibition method with existing multifrequency balance filter, line of rabbet joint couple feed structure of the present utility model, due to the common mode inhibition of himself, balance filter and balanced duplexer common mode realize simple, and common mode inhibition is significantly improved.
2, compare with balanced duplexer high selectivity implementation method with existing multifrequency balance filter, the frame mode that the utility model adopts can produce outward two transmission zeros at passband, realizes accurate oval bandpass characteristics.When realizing multifrequency, the selectivity of passband still improves.
3, compared with frequency during existing multifrequency symmetric filter designs or the controlled implementation method of bandwidth, the line of rabbet joint couple feed band that the utility model proposes leads to loading effect between unit almost not to be affected passband, between each passband frequency and bandwidth independent controlled.According to this characteristic, the utility model can be extended to the symmetric filter designs of three frequently even more multifrequencies.
4, the line of rabbet joint couple feed band that the utility model proposes leads to the design that unit also can be applicable to high common mode inhibition balanced duplexer, is also the method for designing proposing high common mode inhibition multifrequency balanced duplexer first in the utility model.
Accompanying drawing explanation
Fig. 1 is the structural representation that line of rabbet joint couple feed band described in the utility model leads to unit.
The medium substrate schematic diagram that Fig. 2 uses for the utility model.
Fig. 3 a is the physical size figure that line of rabbet joint couple feed band described in the utility model leads to unit.
Fig. 3 b is the coupling figure that line of rabbet joint couple feed band described in the utility model leads to unit.
Fig. 4 is the simulation result figure leading to unit based on line of rabbet joint couple feed band.
Fig. 5 a is the structure chart of the three frequency balancing band bandpass filters leading to unit based on line of rabbet joint couple feed band.
Fig. 5 b is the coupling figure of the three frequency balancing band bandpass filters leading to unit based on line of rabbet joint couple feed band.
Fig. 6 a is the structure chart of the double frequency balanced duplexer leading to unit based on line of rabbet joint couple feed band.
Fig. 6 b is the coupling figure of the double frequency balanced duplexer leading to unit based on line of rabbet joint couple feed band.
Fig. 7 a is the structure chart of the four frequency balanced duplexer leading to unit based on line of rabbet joint couple feed band.
Fig. 7 b is the coupling figure of the four frequency balanced duplexer leading to unit based on line of rabbet joint couple feed band.
Fig. 8 is the experimental result picture of the three frequency balancing band bandpass filters leading to unit based on line of rabbet joint couple feed band.
Fig. 9 a is one of differential-mode response result figure leading to the double frequency balanced duplexer of unit based on line of rabbet joint couple feed band.
Fig. 9 b is the differential-mode response result figure bis-of the double frequency balanced duplexer leading to unit based on line of rabbet joint couple feed band.
Fig. 9 c is the common-mode response result figure of the two-frequency duplex device leading to unit based on line of rabbet joint couple feed band.
Figure 10 a is one of differential-mode response result figure leading to four frequency balanced duplexer of unit based on line of rabbet joint couple feed band.
Figure 10 b is the differential-mode response result figure bis-of the four frequency balanced duplexer leading to unit based on line of rabbet joint couple feed band.
Figure 10 c is the common-mode response result figure of the four frequency balanced duplexer leading to unit based on line of rabbet joint couple feed band.
Figure 11 a is the SIR double frequency balance electric filter structure figure of Q Xue in background technology.
Figure 11 b is that the lump original paper of Q Xue in background technology loads double frequency balance electric filter structure figure.
Figure 12 a is the three frequency balance electric filter structure figure of X.W.Shi in background technology.
Figure 12 b is the balanced duplexer structure chart of X.W.Shi in background technology.
Embodiment
Below in conjunction with specific embodiment, the utility model is described in further detail.
As shown in Figure 1, the line of rabbet joint couple feed band of the multifrequency balance filter/duplexer described in the present embodiment leads to unit, the first differential input and output port including specular to the second differential input and output port pair, the first line of rabbet joint resonator C of specular
1with the second line of rabbet joint resonator C
2and the first micro-strip resonantor of specular to the second micro-strip resonantor pair; Wherein, described first differential input and output port to the second differential input and output port pair and the first line of rabbet joint resonator C
1with the second line of rabbet joint resonator C
2same symmetry axis, and this symmetry axis perpendicular to the first micro-strip resonantor to the symmetry axis right with the second micro-strip resonantor; Described first differential input and output port is to including specular and the first input/output port A be connected
1with the second input/output port B
1, this first input/output port A
1with the second input/output port B
1with the first micro-strip resonantor to the second micro-strip resonantor to same symmetry axis, and described first line of rabbet joint resonator C
1this symmetry axis to extend, and through above-mentioned first differential input and output port pair, and there is microstrip feed line coupling unit C between this first differential input and output port pair
3; Described second differential input and output port is to including specular and the 3rd input/output port A be connected
5with the 4th input/output port B
5, the 3rd input/output port A
5with the 4th input/output port B
5with the first micro-strip resonantor to the second micro-strip resonantor to same symmetry axis, and described second line of rabbet joint resonator C
2this symmetry axis to extend, and through above-mentioned second differential input and output port pair, and there is microstrip feed line coupling unit C between this second differential input and output port pair
4; Described first micro-strip resonantor to the second micro-strip resonantor to being connected, this first micro-strip resonantor is to the first micro-strip resonantor A by specular
2with the second micro-strip resonantor A
4form, and this first micro-strip resonantor A
2with the second micro-strip resonantor A
4there is coupling unit A
3, and with the first line of rabbet joint resonator C
1with the second line of rabbet joint resonator C
2same symmetry axis, this second micro-strip resonantor is to the 3rd micro-strip resonantor B by specular
2with the 4th micro-strip resonantor B
4form, and the 3rd micro-strip resonantor B
2with the 4th micro-strip resonantor B
4there is coupling unit B
3, and with the first line of rabbet joint resonator C
1with the second line of rabbet joint resonator C
2same symmetry axis.
Line of rabbet joint couple feed band described in the utility model leads to the design of graphics of unit as shown in Figure 1, and the physical size figure of its correspondence and coupling figure respectively as best shown in figures 3 a and 3b.In coupling figure, resonator 2 is A
2and B
2entirety, resonator 2 ' is A
4and B
4entirety.Wherein resonator 1 and 1 ' represents line of rabbet joint resonator C respectively
1and C
2, it is disresonance point in the design, and its Main Function realizes the coupling between feeder line resonator.Therefore for this balancing band pass filter unit, it is a second order balancing band bandpass filter in essence.Its band-pass behavior is primarily of parameter f
0, Q
edetermine with K value, can be derived by full-wave simulation:
Specifically for this structure, f
0, Q
erepresent by following formula with the determination of K:
f
0＝f(L)
K＝f(W,L
s,G
s)
Q
e＝f(W
0,W
1,W,T
1,T
2,T
3)
Wherein, the frequency f of passband
0by micro-strip resonantor to (A
2and A
4or B
2and B
4) length L determines; For coupling coefficient K, its parameter is primarily of resonator part (A
3or B
3) width W, coupling length Ls and coupling space Gs determines.External Q is primarily of microstrip feed line coupling unit (C
3, C
4) width W 0, line of rabbet joint resonator (C
1, C
2) width W
1, line of rabbet joint resonator (C
1, C
2) location parameter T
1, T
2, T
3and micro-strip resonantor is to (A
2and A
4or B
2and B
4) width W determine.
Fig. 4 gives the simulation result leading to unit based on line of rabbet joint couple feed band, can see that filter is accurate oval second-order bandpass filter characteristic because electromagnetism hybrid coupled creates two transmission zeros (ftd1, ftd2) outside filter band.In addition, can see from the common mode characteristic of filter, common mode passband produces a transmission zero (ftc1) due to the coupling between the line of rabbet joint, and the common mode of whole passband obtains the suppression of 50dB due to line of rabbet joint feed structure.
According to above-mentioned analysis, line of rabbet joint couple feed band leads to unit and can be applicable in multifrequency balance filter and balanced duplexer.First the utility model introduces the design of three frequency balance filters.Fig. 5 a and Fig. 5 b gives the structure chart and the coupling figure that lead to three frequency balancing band bandpass filters of unit based on line of rabbet joint couple feed band.In coupling figure, resonator (1 and 1 ') represents the line of rabbet joint, and it is disresonance point in the design.Resonator (2 and 2 ') in coupling figure, (3 and 3 '), (4 and 4 ') represent the resonator pair of outside, middle side, inner side respectively, corresponding first, second and third passband of formation, according to known above, three passbands can by controlling corresponding parameter (f1 respectively, Qe1 and K1), (f2, Qe2 and K2), (f2, Qe2 and K3), the independence that just can realize three passbands is controlled.And loading effect small between each passband is negligible, therefore the bandwidth sum frequency of each passband is separate controlled.The governing factor of each passband parameter sees the following form 1.
The governing factor of each passband parameter of table 1
Lead to unit for carried line of rabbet joint couple feed band, the utility model is also used in the design of balanced duplexer, realizes multifrequency and high common mode inhibition balanced duplexer.Fig. 6 a, 6b and Fig. 7 a, 7b give structure chart and the coupling figure of double frequency and four frequency balanced duplexer.In coupling figure, resonator (R1, R1 ' and R1 ") represents the line of rabbet joint, and it is disresonance point in the design, plays the effect of couple feed.The mentality of designing of balanced duplexer is led to unit cascaded by two line of rabbet joint couple feed balancing bands.In four figure of balanced duplexer coupling frequently, resonator (2 and 2 '), (3 and 3 ') represent outside left side and the resonator pair of inner side respectively, formation first and the 3rd passband respectively, resonator (4 and 4 '), (5 and 5 ') represent the resonator pair of outside, right side and inner side respectively, respectively formation second and the 4th passband.Following table 2 and table 3 sets forth the controling parameters of double frequency and each passband of four frequency balanced duplexer.
The governing factor of each passband parameter of table 2 double frequency balanced duplexer
The governing factor of each passband parameter of table 3 four frequency balanced duplexer
The medium substrate that the present embodiment adopts, its relative dielectric constant is 2.55, and thickness is 0.8mm, and loss angle tangent is 0.029.As shown in Figure 2, D
1for using the upper strata metal patch of dielectric-slab, D
2for dielectric layer, D
3for dielectric-slab lower floor grounded metal paster, D
4for the line of rabbet joint.
Frequency and the three dB bandwidth of design three frequency balance filter are respectively (2.4GHz, 6%), (3.5GHz, 5%), (5.2GHz, 4%).Fig. 8 gives experimental result picture, can see that the centre frequency of three passbands is respectively 2.42GHz, 3.51GHz, 5.205GHz, three dB bandwidth is respectively 6.3%, 4.5%, 3.6%, in band, differential loss is respectively 0.6dB, 1.2dB, 2.4dB, and in band, return loss is respectively 21dB, 19dB, 14dB.There are two transmission zeros outside each passband, improve selectivity and the isolation of passband.During common mode, filter reaches the common mode inhibition of more than 40dB in whole band connection frequency.
Frequency and the three dB bandwidth of the double frequency balanced duplexer of design are respectively (2.4GHz, 8%), (3.5GHz, 8%), frequency and the three dB bandwidth of four frequency range balanced duplexer are respectively (1.4GHz, 8%), (1.8GHz, 9%), (2.4GHz, 8.5%), (3.5GHz, 10%).
The result of double frequency balanced duplexer is as shown in Fig. 9 a, 9b, 9c, can see that the centre frequency of two passbands is respectively 2.37GHz, 3.47GHz, three dB bandwidth is respectively 7.9%, 7.7%, in band, differential loss is respectively 0.56dB, 0.8dB, and in band, return loss is respectively 23.8dB, 17.8dB.Have two transmission zeros outside each passband, improve the selectivity of passband, the isolation of two passband central frequencies is respectively 25dB, 33dB.During common mode, filter reaches common mode inhibition and the isolation of more than 50dB in whole band connection frequency.
In like manner, the result of four frequency balanced duplexer is as shown in Figure 10 a, 10b, 10c, can see that the centre frequency of four passbands is respectively 1.37GHz, 1.79GHz, 2.32GHz, 3.6GHz, three dB bandwidth is respectively 7.8%, 8.8%, 8.4%, 9.6%, in band, differential loss is respectively 0.73dB, 0.75dB, 0.9dB, 2.2dB, and in band, return loss is respectively 18.36dB, 26.8dB, 22dB, 14.8dB.Have multiple transmission zero outside each passband, improve the selectivity of passband, the isolation of four passband central frequencies is respectively 19.3dB, 21.7dB, 32dB, 20dB.During common mode, filter reaches common mode inhibition and the isolation of more than 40dB in whole band connection frequency.
Can see from above, the employing line of rabbet joint couple feed band that the utility model proposes leads to the multifrequency balance filter of unit and duplexer can realize high selectivity, high common mode inhibition and frequency and bandwidth is independent controlled, is worthy to be popularized.
The examples of implementation of the above are only the preferred embodiment of the utility model, not limit practical range of the present utility model with this, therefore the change that all shapes according to the utility model, principle are done, all should be encompassed in protection range of the present utility model.
Claims (2)
1. the line of rabbet joint couple feed band of multifrequency balance filter/duplexer leads to unit, it is characterized in that: described line of rabbet joint couple feed band lead to the first differential input and output port that unit includes specular to the second differential input and output port pair, the first line of rabbet joint resonator of specular and the first micro-strip resonantor of the second line of rabbet joint resonator and specular to the second micro-strip resonantor pair, wherein, described first differential input and output port to the second differential input and output port pair and the first line of rabbet joint resonator and the same symmetry axis of the second line of rabbet joint resonator, and this symmetry axis perpendicular to the first micro-strip resonantor to the symmetry axis right with the second micro-strip resonantor, described first differential input and output port is to including specular and the first input/output port be connected and the second input/output port, this first input/output port and the second input/output port and the first micro-strip resonantor to the second micro-strip resonantor to same symmetry axis, and described first line of rabbet joint resonator extends on this symmetry axis, and through above-mentioned first differential input and output port pair, and there is microstrip feed line coupling unit between this first differential input and output port pair, described second differential input and output port is to including specular and the 3rd input/output port be connected and the 4th input/output port, 3rd input/output port and the 4th input/output port and the first micro-strip resonantor to the second micro-strip resonantor to same symmetry axis, and described second line of rabbet joint resonator extends on this symmetry axis, and through above-mentioned second differential input and output port pair, and there is microstrip feed line coupling unit between this second differential input and output port pair, described first micro-strip resonantor to the second micro-strip resonantor to being connected, this first micro-strip resonantor is formed by the first micro-strip resonantor of specular and the second micro-strip resonantor, and there is coupling unit in this first micro-strip resonantor and the second micro-strip resonantor, and with the first line of rabbet joint resonator and the same symmetry axis of the second line of rabbet joint resonator, this second micro-strip resonantor is formed by the 3rd micro-strip resonantor of specular and the 4th micro-strip resonantor, and there is coupling unit in the 3rd micro-strip resonantor and the 4th micro-strip resonantor, and with the first line of rabbet joint resonator and the same symmetry axis of the second line of rabbet joint resonator.
2. the line of rabbet joint couple feed band of a kind of multifrequency balance filter/duplexer according to claim 1 leads to unit, it is characterized in that: described line of rabbet joint couple feed band leads to the band-pass behavior of unit primarily of parameter f
0, Q
edetermine with K value, can be derived by full-wave simulation:
In formula, f
0, Q
erepresent by following formula with the determination of K:
f
0＝f(L)
K＝f(W,L
s,G
s)
Q
e＝f(W
0,W
1,W,T
1,T
2,T
3)
Wherein, the frequency f of passband
0the length L right by micro-strip resonantor determines; For coupling coefficient K, its parameter is primarily of right coupling unit width W, the coupling length L of micro-strip resonantor
swith coupling space G
sdetermine; External Q is primarily of the width W of microstrip feed line coupling unit
0, line of rabbet joint resonator width W
1, line of rabbet joint resonator location parameter T
1, T
2, T
3and the right width W of micro-strip resonantor is determined.
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|---|---|---|---|
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|---|---|---|---|
| CN201520347823.1U CN204651440U (en) | 2015-05-26 | 2015-05-26 | A kind of line of rabbet joint couple feed band of multifrequency balance filter/duplexer leads to unit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104900948A (en) * | 2015-05-26 | 2015-09-09 | 华南理工大学 | Grooved wire coupling and feeding bandpass unit for multi-frequency balance filter/diplexer |
| CN105870554A (en) * | 2016-06-06 | 2016-08-17 | 南通大学 | Differential broadband filter with asymmetric structure |
| CN108879043A (en) * | 2018-06-26 | 2018-11-23 | 井冈山大学 | A kind of three modal balancing filters using coupling minor matters load line of rabbet joint resonance structure |
| CN110137644A (en) * | 2019-04-23 | 2019-08-16 | 华中科技大学 | A kind of highly selective Wide stop bands balance filter based on the line of rabbet joint |
| CN113540726A (en) * | 2021-06-09 | 2021-10-22 | 西安电子科技大学 | Differential double-frequency duplex power divider using novel matching network |
-
2015
- 2015-05-26 CN CN201520347823.1U patent/CN204651440U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104900948A (en) * | 2015-05-26 | 2015-09-09 | 华南理工大学 | Grooved wire coupling and feeding bandpass unit for multi-frequency balance filter/diplexer |
| CN104900948B (en) * | 2015-05-26 | 2018-06-22 | 华南理工大学 | A kind of line of rabbet joint couple feed band logical unit of multifrequency balance filter/duplexer |
| CN105870554A (en) * | 2016-06-06 | 2016-08-17 | 南通大学 | Differential broadband filter with asymmetric structure |
| CN105870554B (en) * | 2016-06-06 | 2018-09-28 | 南通大学 | The differential type broadband filter of unsymmetric structure |
| CN108879043A (en) * | 2018-06-26 | 2018-11-23 | 井冈山大学 | A kind of three modal balancing filters using coupling minor matters load line of rabbet joint resonance structure |
| 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 |
| CN110137644A (en) * | 2019-04-23 | 2019-08-16 | 华中科技大学 | A kind of highly selective Wide stop bands balance filter based on the line of rabbet joint |
| CN110137644B (en) * | 2019-04-23 | 2020-10-30 | 华中科技大学 | High-selectivity wide-stop-band balance filter based on slot line |
| CN113540726A (en) * | 2021-06-09 | 2021-10-22 | 西安电子科技大学 | Differential double-frequency duplex power divider using novel matching network |
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