CN204130668U - A dual-band rejection filter using three-path signal interference - Google Patents
A dual-band rejection filter using three-path signal interference Download PDFInfo
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- CN204130668U CN204130668U CN201420412633.9U CN201420412633U CN204130668U CN 204130668 U CN204130668 U CN 204130668U CN 201420412633 U CN201420412633 U CN 201420412633U CN 204130668 U CN204130668 U CN 204130668U
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Abstract
The utility model discloses a double-frequency band elimination filter adopting three-path signal interference, which comprises an input/output port, a first transmission main path and a second transmission main path, wherein the first transmission main path is composed of a section of transmission line, and two ends of the first transmission main path are respectively connected with the input/output port; the second transmission main path is composed of a first sub-path and a second sub-path which are connected in parallel, and the first sub-path is mainly formed by sequentially cascading a first transmission line, a first coupling line and a second transmission line; the second sub-path is mainly formed by sequentially cascading a second coupling line, a third coupling line and a fourth coupling line, wherein the third coupling line is short-circuited at the end; the second coupling line and the fourth coupling line are folded and cascaded with the first coupling line and the third coupling line, the first transmission line is overlapped with the second coupling line, and the second transmission line is overlapped with the fourth coupling line. The utility model discloses make the design more nimble, transmission zero point realizes independently controllable through different routes in the stop band, possesses precipitous roll-off characteristic and miniaturization.
Description
Technical field
The utility model relates to the technical field of microwave communication, refers in particular to a kind of Double-frequency band elimination filter adopting three path signal interference.
Background technology
The extensive use of wireless communication system, facilitates the development of frequency microwave device.Band stop filter, as the important part of communication system, can suppress the spurious signal of special frequency channel, and erasure signal disturbs, and the performance of quality to whole communication system of its performance plays key effect.On the other hand, in order to utilize limited frequency spectrum resource in maximum efficiency, increasing wireless system is all operated in two-band.Double-frequency band elimination filter has that dual-band frequency suppresses, compared with the feature of lower passband differential loss and group delay, compared with single-frequency band stop filter, the availability of frequency spectrum of communication system greatly improves, and power consumption, the size of system also greatly reduce.
Current having obtained of Double-frequency band elimination filter is studied widely, it is also proposed the method for designing that some are different, as follows:
1, based on frequency translation
2004, the people such as Jiro Hirokawa and Makoto Ando deliver in the article being entitled as " Dual-band-rejection filter for distortion reduction in RF transmitters " on IEEE Transactions on Microwave Theory and Techniques, propose a kind of method being obtained dual-attenuation on the basis of low-pass prototype by frequency translation, Fig. 7 is its simulated measurement result.The performance of this structure depends on two short circuit coupling minor matters be coupled to a great extent.
2, based on multimode resonance
2007, what the people such as Kuo-Sheng Chin delivered on IEEE Microwave and Wireless Components Letters is entitled as in the article of " Compact dual-band bandstop filters using stepped-impedance resonators ", propose on the basis of traditional minor matters line single-frequency band stop filter, two stepped impedance minor matters (SIR) of opening a way are used to substitute uniform impedance minor matters, structure as shown in Figure 8 a, thus realizes dual-attenuation response.Fig. 8 b gives its simulated measurement result, can see that the outer return loss of band needs improvement.
2012, in " Dual-band bandstop filter using open and short stub-loaded resonators " article that the people such as domestic scholars Zhang Xiuyin deliver on International Conference on Microwave and Millimeter Wave Technology, employ the resonator of short circuit minor matters loading to design Double-frequency band elimination filter, as illustrated in fig. 9.Its even mould mode of resonance is used to formation first stopband, and strange mould mode of resonance is suppressed, uses three even mould harmonic modes to form the second stopband simultaneously.From emulation testing curve shown in Fig. 9 b, because passband only has a transmission zero, its stopband selectivity is to be improved.
3, multi-path signal interference
Multi-path signal interference utilizes path phase to differ from 180 ° to be formed band resistance response.Domestic scholars Che Wenquan in 2013 etc. are utilize the dual path comprising minor matters and coupling line to devise a broadband dual-frequency band stop filter in the article of " Dual-wideband bandstop filter using transversal signal-interaction concept " at the table title that Electronics Letters delivers, and its structure as shown in Figure 10.Can see that passband selectivity is higher, but stopband suppresses and the outer return loss of band only can reach 10dB.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of Double-frequency band elimination filter adopting three path signal interference is provided, make design become more flexible, achieve independent controlled, the higher abruptness of transmission zero in stopband, the outer return loss of good band and miniaturization.
For achieving the above object, technical scheme provided by the utility model is: a kind of Double-frequency band elimination filter adopting three path signal interference, include input/output port, the first transmission main path, the second transmission main path, wherein, described first transmission main path is made up of one section of transmission line, and its two ends are connected with input/output port respectively; Described second transmission main path is made up of the first sub cost sum second subpath of parallel connection, is set in the outside of the first subpath or is embedded in the inside of the first subpath outside described second subpath; Described first subpath is made up of the open circuit minor matters be coupled, and forms primarily of the first transmission line, the first coupling line, the second transmission line successively cascade; Described second subpath is made up of the short circuit minor matters be coupled, and forms primarily of the second coupling line, the 3rd coupling line, the 4th coupling line successively cascade, and described 3rd coupling line terminal shortcircuit; Described second coupling line and the 4th coupling line after folding with the first coupling line and the 3rd coupling line cascade, described first transmission line is overlapping with the second coupling line, and described second transmission line is overlapping with the 4th coupling line.
The transmission line electrical length of described first transmission main path is θ
1, impedance is Z
1; All short circuits and the total electrical length of open circuit minor matters are also θ
1, electrical length θ
1for frequency 0.5 (f
1+ f
2) under the odd-multiple of four/wavelength, f
1, f
2for the centre frequency of band stop filter, the electrical length of short circuit and open circuit minor matters coupling unit is θ
3, the electrical length that short circuit and open circuit minor matters fold coupling unit is θ
2, total electrical length θ
1=θ
3+ θ
2.
All coupling lines such as all to use at the two-wire coupled transmission line transmission of line width.
Described 3rd coupling line terminal shortcircuit adopts metal throuth hole, is loaded with the pad of band metallic vias.
Compared with prior art, tool has the following advantages and beneficial effect the utility model:
1, tradition uses Double-frequency band elimination filter many uses dual path of signal disturbing design, the utility model proposes by inlay in the open circuit minor matters of folding coupling or the short circuit minor matters of embedded coupling realize three paths innovatively outward, makes design more flexible and miniaturized;
Transmission zero in the Double-frequency band elimination filter stopband of 2, the utility model design is independent controlled by different path implement, the problem that when overcoming conventional dual path signal disturbing design Double-frequency band elimination filter, transmission zero can not independently control;
3, the outer return loss of Double-frequency band elimination filter band of the present utility model can be improved to 20dB, and between stopband, suppression level reaches 25dB, can realize higher abruptness simultaneously.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of Double-frequency band elimination filter described in the utility model.
Fig. 2 is the structural representation of Double-frequency band elimination filter described in the utility model.
Fig. 3 is the path phase figure of Double-frequency band elimination filter.
Fig. 4 is that Double-frequency band elimination filter is with parameter Z
ooand θ
3performance diagram.
Fig. 5 be Double-frequency band elimination filter with parameter Z
1performance diagram.
Fig. 6 is the simulated measurement result figure of Double-frequency band elimination filter.
Fig. 7 is a kind of simulated measurement result figure being obtained the method for dual-attenuation on the basis of low-pass prototype by frequency translation of the people such as Jiro Hirokawa and Makoto Ando in background technology.
Fig. 8 a is the structural representation of the Double-frequency band elimination filter of the people such as Kuo-Sheng Chin in background technology.
Fig. 8 b is the simulated measurement result figure of structure shown in Fig. 8 a.
Fig. 9 a is the structural representation of the Double-frequency band elimination filter of the people such as domestic scholars Zhang Xiuyin in background technology.
Fig. 9 b is the simulated measurement result figure of structure shown in Fig. 9 a.
Figure 10 is the structural representation of the Double-frequency band elimination filter of the people such as domestic scholars Che Wenquan in background technology.
Embodiment
Below in conjunction with specific embodiment, the utility model is described in further detail.
The Double-frequency band elimination filter of employing three path signal interference described in the utility model, on the basis of tradition open circuit minor matters single-frequency band stop filter, by folding coupling two the open circuit minor matters also outer short-circuit resonant device inlaying the folding coupling of (or embedded) two, while not increasing filter size, achieve three paths.The utility model project organization can be micro-band, coaxial line or other structure.The present embodiment selects microstrip structure, Double-frequency band elimination filter comprise upper strata microstrip line construction, interlayer substrate is with the grounded metal paster of lower floor and be connected upper and lower two-layer metal throuth hole by intermediate layer.
As depicted in figs. 1 and 2, described Double-frequency band elimination filter includes input/output port 1, first and transmits main path path1, the second transmission main path, and wherein, described first transmission main path path1 is made up of one section of transmission line 2, and transmission line electrical length is θ
1, impedance is Z
1, its two ends are connected with input/output port 1 respectively, and described input/output port transmission line impedance is 50 Ω; Described second transmission main path is made up of the first subpath path21 of parallel connection and the second subpath path22, is set in the outside of the first subpath path21 or is embedded in the inside of the first subpath path21 outside described second subpath path22; Described first subpath path21 is made up of the open circuit minor matters be coupled, and forms primarily of the first transmission line 3, first coupling line 4, second transmission line 5 successively cascade; Described second subpath path22 is made up of the short circuit minor matters be coupled, and forms primarily of the second coupling line 6, the 3rd coupling line 7, the 4th coupling line 8 successively cascade, and described 3rd coupling line 7 terminal shortcircuit; Described second coupling line 6 and the 4th coupling line 8 after folding with the first coupling line 4 and the 3rd coupling line 7 cascade; All coupling lines such as all to use at the two-wire coupled transmission line transmission of line width; Described first transmission line 3 is overlapping with the second coupling line 6, and described second transmission line 5 is overlapping with the 4th coupling line 8; Described 3rd coupling line 7 terminal shortcircuit adopts metal throuth hole, is loaded with the pad 10 of band metallic vias 9.All short circuits and the total electrical length of open circuit minor matters are also θ
1, to transmit the transmission line electrical length of main path path1 the same with first, electrical length θ
1for 0.5 (f of frequency
1+ f
2) under the odd-multiple of four/wavelength, f
1, f
2for the centre frequency of band stop filter, the electrical length of short circuit and open circuit minor matters coupling unit is θ
3, the electrical length that short circuit and open circuit minor matters fold coupling unit is θ
2, total electrical length θ
1=θ
3+ θ
2, all coupling line parts all have identical odd mode impedance Z in the present embodiment
oo, even mode impedance Z
oewith coupling coefficient K, K=(Z
oe-Z
oo)/(Z
oe+ Z
oo), can certainly adopt not isoparametric coupling line, this determines according to actual conditions.
Fig. 3 gives the phase diagram in different path, as we can see from the figure due to the signal disturbing between the second transmission two single sub path path21 of main path and path22, in frequency f
tz2and f
tz3place's generation two transmission zeros.In addition, because the first transmission main path and second transmits the signal cancellation of main path, at f
tz1and f
tz4place produces transmission zero.The introducing of three transmission paths makes in stopband two transmission zeros independently be controlled, and makes design of filter more flexible simultaneously.As seen from Figure 4, can realize dual-attenuation center frequency ratio f by controlling coupling line coupling coefficient K
2/ f
1control; Coupling line odd mode impedance Z
oowith electrical length θ
3control the bandwidth of filter.In addition, as seen from Figure 5 first transmission main path transmission line impedance Z
1can be used for realization improves passband return loss and reaches more than 20dB.
We are to design the Double-frequency band elimination filter of 2.4GHz and 3.7GHz below.
Regulate suitable coupling coefficient K to realize center frequency ratio requirement, regulate coupling line odd mode impedance Z
oowith electrical length θ
3meet bandwidth, finally regulate Z
1realize band external characteristic.The circuit of embodiment and electromagnetic simulation software are Agilent Advanced Design System (ADS).Double-frequency band elimination filter Choice and process dielectric constant 2.55, thickness be 0.8mm, loss angle tangent is on the medium substrate of 0.0029, concrete physical size is as shown in table 1 below.The present embodiment is measured by Agilent 5230 network analyzer, and simulated measurement result as shown in Figure 6.Measure two mid-band frequencies and be respectively 2.42GHz and 3.73GHz, 20dB machined strip width is respectively 7.5% and 8.6%.Between two stopbands, return loss reaches 25dB.Pass band insertion loss is less than 0.5dB within the scope of 2.04GHz, within the scope of 4.2-7.8GHz, be less than 1dB.This filter has good abruptness, and the degree of decay of first passband lower sideband and second passband high frequency sideband is respectively 174dB/GHz and 136dB/GHz.
Table 1-Double-frequency band elimination filter size
| Symbol | Value (mm) | Symbol | Value (mm) |
| L 1 | 15 | W 2 | 0.3 |
| L 2 | 45.6 | S 1 | 0.3 |
| L 3 | 1.75 | D | 1 |
| W 1 | 1.75 | R | 0.3 |
In sum, the utility model proposes three path signal interference Double-frequency band elimination filters innovatively and makes design more flexible, in stopband, transmission zero is independent controlled by different path implement, be with outer return loss to be improved to 20dB simultaneously, the roll-off characteristic that tool is precipitous and miniaturization, be 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 (5)
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|---|---|---|---|
| CN201420412633.9U CN204130668U (en) | 2014-07-24 | 2014-07-24 | A dual-band rejection filter using three-path signal interference |
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|---|---|---|---|
| CN201420412633.9U CN204130668U (en) | 2014-07-24 | 2014-07-24 | A dual-band rejection filter using three-path signal interference |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104143673A (en) * | 2014-07-24 | 2014-11-12 | 华南理工大学 | A dual-band rejection filter using three-path signal interference |
| CN105703043A (en) * | 2016-01-18 | 2016-06-22 | 南京理工大学 | Novel high-selectivity balance filter based on signal interference technology |
| CN110148817A (en) * | 2019-06-11 | 2019-08-20 | 上海海事大学 | The four transmission zero Double-frequency band elimination filters based on all-pass coupling line |
| CN110518314A (en) * | 2019-09-07 | 2019-11-29 | 西南交通大学 | A kind of multi-frequency band elimination filter based on hybrid electromagnetic coupling multimode resonator |
| CN110534853A (en) * | 2019-09-07 | 2019-12-03 | 西南交通大学 | A kind of multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator |
-
2014
- 2014-07-24 CN CN201420412633.9U patent/CN204130668U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104143673A (en) * | 2014-07-24 | 2014-11-12 | 华南理工大学 | A dual-band rejection filter using three-path signal interference |
| CN104143673B (en) * | 2014-07-24 | 2016-10-05 | 华南理工大学 | A dual-band rejection filter using three-path signal interference |
| CN105703043A (en) * | 2016-01-18 | 2016-06-22 | 南京理工大学 | Novel high-selectivity balance filter based on signal interference technology |
| CN105703043B (en) * | 2016-01-18 | 2018-04-03 | 南京理工大学 | High selectivity balance filter based on signal interference technology |
| CN110148817A (en) * | 2019-06-11 | 2019-08-20 | 上海海事大学 | The four transmission zero Double-frequency band elimination filters based on all-pass coupling line |
| CN110518314A (en) * | 2019-09-07 | 2019-11-29 | 西南交通大学 | A kind of multi-frequency band elimination filter based on hybrid electromagnetic coupling multimode resonator |
| CN110534853A (en) * | 2019-09-07 | 2019-12-03 | 西南交通大学 | A kind of multi-frequency band elimination filter based on symmetrical fissions structure multimode resonator |
| CN110518314B (en) * | 2019-09-07 | 2020-12-01 | 西南交通大学 | A Multiband Rejection Filter Based on Hybrid Electromagnetically Coupled Multimode Resonators |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150128 Effective date of abandoning: 20161005 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |