CN103985926B - A kind of bimodulus balanced filter based on micro-strip slotted line structure - Google Patents
A kind of bimodulus balanced filter based on micro-strip slotted line structure Download PDFInfo
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- CN103985926B CN103985926B CN201410167229.4A CN201410167229A CN103985926B CN 103985926 B CN103985926 B CN 103985926B CN 201410167229 A CN201410167229 A CN 201410167229A CN 103985926 B CN103985926 B CN 103985926B
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- 239000002184 metal Substances 0.000 claims description 11
- 238000012545 processing Methods 0.000 abstract description 3
- 230000005764 inhibitory process Effects 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 6
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- 230000001629 suppression Effects 0.000 description 2
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- 230000009977 dual effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
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Abstract
The invention discloses a kind of bimodulus balanced filter based on micro-strip slotted line structure, comprise the first equal sized and symmetrical wave filter and the second wave filter, described first wave filter and the second wave filter all comprise the slotted line structure of microstrip line construction and the medium substrate lower floor being positioned at medium substrate upper strata, wherein the microstrip line construction of the first wave filter comprises the first feeder line, the second feeder line, the first resonator and the second resonator, and slotted line structure comprises the first slotted line and the second slotted line；The microstrip line construction of the second wave filter comprises the 3rd feeder line, the 4th feeder line, the 3rd resonator and the 4th resonator, and slotted line structure comprises the 3rd slotted line and the 4th slotted line.First to fourth resonator described uses bending structure, and a part is positioned at medium substrate upper strata, and another part is bent to medium substrate lower floor.The present invention has broadband, the feature of high common mode inhibition, and circuit structure is simple, it is easy to processing, has bigger practicality.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to a kind of bimodulus balanced filter based on micro-strip slotted line structure.
Background technology
In modern wireless communication systems, balancing device is of increased attention, because balancing device can effectively suppress the noise of environment noise and internal system.Balanced filter as the requisite device of wireless communication system, is studied widely having obtained in recent years.Balanced filter has filter action under difference mode signal encourages, and can effectively suppress environment and the noise of internal system generation, thus is widely used in modern wireless communications circuits.Common-mode signal can reduce its signal to noise ratio, so in balancing circuitry designs, will strengthen the suppression level to common-mode signal as far as possible.
Existing symmetric filter designs is mainly for narrowband systems, this is because be difficult to accomplish to suppress common-mode signal in the widest frequency band, and balanced filter often has the most complicated structure.
Summary of the invention
The technical problem to be solved is the defect for background technology, it is provided that a kind of micro-strip double-module balanced filter based on slotted line structure, and it has the highest common-mode rejection properties in the widest difference mode signal passband, and circuit is simple, it is easy to processing.
The present invention solves above-mentioned technical problem by the following technical solutions:
A kind of bimodulus balanced filter based on micro-strip slotted line structure, comprises the first wave filter and the second wave filter；
Described first wave filter and the second wave filter all include the slotted line structure of microstrip line construction and the medium substrate lower floor being positioned at medium substrate upper strata；
The microstrip line construction of described first wave filter includes the first feeder line, the second feeder line, the first resonator and the second resonator, the slotted line structure of described first wave filter includes the first slotted line and the second slotted line, the microstrip line construction of described second wave filter comprises the 3rd feeder line, the 4th feeder line, the 3rd resonator and the 4th resonator, and the slotted line structure of described second wave filter comprises the 3rd slotted line and the 4th slotted line；
Described first to fourth resonator all uses bending structure, and a part is positioned at the upper strata of medium substrate, and another part is bent to medium substrate lower floor；
Described first resonator and the second resonator are parallel to each other, and are connected in one by being positioned at the metal level of medium substrate；
Described 3rd resonator and the 4th resonator are parallel to each other, and are connected in one by being positioned at the metal level of medium substrate；
The sections transverse that described first feeder line one end is positioned at medium substrate upper strata with described first resonator is connected and becomes L-type structure, the sections transverse that described second feeder line one end is positioned at medium substrate upper strata with described second resonator is connected and becomes L-type structure, and the other end of described first feeder line and the other end of described second feeder line partner input/output port；
The sections transverse that described 3rd feeder line one end is positioned at medium substrate upper strata with described 3rd resonator is connected and becomes L-type structure, the sections transverse that described 4th feeder line one end is positioned at medium substrate upper strata with described 4th resonator is connected and becomes L-type structure, and the other end of described 3rd feeder line and the other end of described 4th feeder line partner input/output port；
Second slotted line loads on the centre position of the first slotted line and parallel with the first slotted line；
4th slotted line loads on the centre position of the 3rd slotted line and parallel with the 3rd slotted line；
Described first wave filter and the second filter construction are identical, symmetrical, and wherein the first feeder line and the 3rd feeder line be symmetrical, the second feeder line and the 4th feeder line is symmetrical, the first resonator is symmetrical with the 3rd resonator, the second resonator is symmetrical with the 4th resonator, the second slotted line and the 4th slotted line symmetry, the first slotted line and the 3rd slotted line symmetry being connected on the plane of symmetry is integrally forming；
Described first to fourth feeder line structure is identical, equal sized；
Described first to fourth resonator structure is identical, equal sized；
Described first slotted line is identical, equal sized with described 3rd slotted line structure；
Described second slotted line is identical, equal sized with described 4th slotted line structure；
Described first to fourth resonator is quarter-wave resonance device.
As a kind of bimodulus further prioritization scheme of balanced filter based on slotted line structure of the present invention, described first to fourth feeder line characteristic impedance is 50 ohm.
The present invention uses above technical scheme compared with prior art, has following technical effect that
Described balanced filter uses slotted line loading structure, forms dual-mode resonator, thus has the widest bandwidth, uses the resonator of foldable structure, obtains the highest common-mode rejection properties；Circuit structure is simple, it is easy to processing.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of used printed circuit board (PCB)；
Fig. 2 is described balance electric filter structure schematic diagram；
Fig. 3 is described balanced filter equivalent circuit under difference mode signal encourages；
Fig. 4 is described balanced filter equivalent circuit under common-mode signal encourages；
Fig. 5 is scattering parameter emulation and test result (emulation uses HFSS software, and test uses Agilent N5230C vector network analyzer, lower same) of micro-strip balanced filter of the present invention；
Fig. 6 is the group delay test result of micro-strip balanced filter of the present invention.
In figure, the A1: the first feeder line；A2: the second feeder line；A3: the first resonator；A4: the second resonator；A5: the first slotted line；A6: the second slotted line；B1: the three feeder line；B2: the four feeder line；B3: the three resonator；B4: the four resonator；B5: the three slotted line；B6: the four slotted line；S1: medium；S2: substrate upper strata metal；S3: substrate lower metal；Pin1: first input port；Pin2: the second input port；Pout1: the first output port；Pout2: the second output port.
Detailed description of the invention
Below in conjunction with the accompanying drawings technical scheme is described in further detail:
The invention discloses a kind of bimodulus balanced filter based on micro-strip slotted line structure, comprise the first wave filter and the second wave filter；
Described first wave filter and the second wave filter all include the slotted line structure of microstrip line construction and the medium substrate lower floor being positioned at medium substrate upper strata；
The microstrip line construction of described first wave filter includes the first feeder line, the second feeder line, the first resonator and the second resonator, the slotted line structure of described first wave filter includes the first slotted line and the second slotted line, the microstrip line construction of described second wave filter comprises the 3rd feeder line, the 4th feeder line, the 3rd resonator and the 4th resonator, and the slotted line structure of described second wave filter comprises the 3rd slotted line and the 4th slotted line；
Described first to fourth resonator all uses bending structure, and a part is positioned at the upper strata of medium substrate, and another part is bent to medium substrate lower floor；
Described first resonator and the second resonator are parallel to each other, and are connected in one by being positioned at the metal level of medium substrate；
Described 3rd resonator and the 4th resonator are parallel to each other, and are connected in one by being positioned at the metal level of medium substrate；
The sections transverse that described first feeder line one end is positioned at medium substrate upper strata with described first resonator is connected and becomes L-type structure, the sections transverse that described second feeder line one end is positioned at medium substrate upper strata with described second resonator is connected and becomes L-type structure, and the other end of described first feeder line and the other end of described second feeder line partner input/output port；
The sections transverse that described 3rd feeder line one end is positioned at medium substrate upper strata with described 3rd resonator is connected and becomes L-type structure, the sections transverse that described 4th feeder line one end is positioned at medium substrate upper strata with described 4th resonator is connected and becomes L-type structure, and the other end of described 3rd feeder line and the other end of described 4th feeder line partner input/output port；
Second slotted line loads on the centre position of the first slotted line and parallel with the first slotted line；
4th slotted line loads on the centre position of the 3rd slotted line and parallel with the 3rd slotted line；
Described first wave filter and the second filter construction are identical, symmetrical, and wherein the first feeder line and the 3rd feeder line be symmetrical, the second feeder line and the 4th feeder line is symmetrical, the first resonator is symmetrical with the 3rd resonator, the second resonator is symmetrical with the 4th resonator, the second slotted line and the 4th slotted line symmetry, the first slotted line and the 3rd slotted line symmetry being connected on the plane of symmetry is integrally forming；
Described first to fourth feeder line structure is identical, equal sized；
Described first to fourth resonator structure is identical, equal sized；
Described first slotted line is identical, equal sized with described 3rd slotted line structure；
Described second slotted line is identical, equal sized with described 4th slotted line structure；
Described first to fourth resonator is quarter-wave resonance device.
Described first to fourth feeder line characteristic impedance is 50 ohm.
The output port of balanced filter of the present invention and input port all use SMA head to weld, in order to access test or be connected with circuit.
The present invention uses relative dielectric constant to be 2.2, and thickness is that the pcb board of 0.508mm is as medium substrate, it would however also be possible to employ the pcb board of other specifications is as substrate.As it is shown in figure 1, be respectively coated by metal level S2 and lower metal layer S3 on the upper and lower surface of the dielectric substrate S1 of pcb board.
Fig. 2 is the circuit diagram of described balanced filter, and draw above is top view, is the side view of substrate below.Balanced filter described in figure is made up of the first wave filter and the second wave filter, and wherein the first wave filter includes: the first feeder line A1, the second feeder line A2, the first resonator A3, the second resonator A4, the first slotted line A5, the second slotted line A6；Second wave filter includes: the 3rd feeder line B1, the 4th feeder line B2, the 3rd resonator B3, the 4th resonator B4, the 3rd slotted line B5, the 4th slotted line B6；First wave filter and the second wave filter are symmetrical about plane of symmetry OPP ' O ', structure is identical, wherein the first to two feeder line (A1-A2) is symmetrical with the three to four feeder line (B1-B2) respectively, the first to two resonator (A3-A4) is symmetrical with the three to four resonator (B3-B4) respectively, the first to two slotted line (A5-A6) is symmetrical with the three to four slotted line (B5-B6) respectively, and the first slotted line A5 and the 3rd slotted line B5 is connected with each other on the plane of symmetry；The feature of described balanced filter is described below as a example by the first wave filter, does not lose it general.First resonator A3 and the second resonator A4 all uses foldable structure, as shown in FIG., it is bent to an asymmetric U-shape structure, one end is positioned at the upper strata of medium substrate, one end is positioned at the lower floor of medium substrate, and underclad portion is placed exactly in slotted line, the upper and lower part is parallel to each other, and is connected in one by the part being positioned at medium substrate.First resonator A3 and the second resonator A4 is positioned at one end respectively with the first feeder line A1 and the second feeder line A2, the one end on medium substrate upper strata and is vertically connected, and the other end of the first feeder line A1 and the second feeder line A2 is respectively as input or output port.It is positioned at the first slotted line A5 and the second slotted line A6 of medium substrate lower floor by being formed after being etched by lower metal S3, wherein the second slotted line A6 is similar to as T-type structure, load on the centre position of the first slotted line A5, second slotted line A6 and the first slotted line A5 is parallel to each other, and thus forms the micro-strip slotted line resonator of a bimodulus.
When difference mode signal enters system from input port Pin1 and input port Pin2, this balanced filter is equivalent to short circuit on plane of symmetry OPP ' O ', and its equivalent circuit is as shown in Figure 3.Now, being equivalent to there is an electric wall between the first slotted line A5 and the 3rd slotted line B5, balanced filter is equivalent to a single-ended filter, due to the full symmetric property of structure, illustrates, without loss of generality as a example by the first wave filter.Now, the second slotted line A6 loads on the centre position of the first slotted line A5, forms the dual-mode resonator of symmetrical configuration, i.e. produces the difference mode signal passband of dual mode wideband.
When common-mode signal enters system from input port Pin1 and input port Pin2, this balanced filter is equivalent to open circuit on plane of symmetry OPP ' O ', and its equivalent circuit is as shown in Figure 4.Now, being equivalent to there is a magnetic wall between the first slotted line A5 and the 3rd slotted line B5, balanced filter is equivalent to a single-ended filter, due to the full symmetric property of structure, illustrates, without loss of generality as a example by the first wave filter.Now, wave filter destructurized, common-mode signal can not normal transmission, the first resonator A3 and the second resonator A4 uses foldable structure to be the suppression in order to improve common-mode signal.
As it is shown in figure 5, the scattering parameter emulation of bimodulus balanced filter of the present invention and measured result.Return loss under wherein Sdd11 represents difference mode signal excitation, Sdd21 is the transmission coefficient under difference mode signal excitation, and Scc21 is the transmission coefficient under common-mode signal excitation.Described balance microstrip filter mid frequency is 5.25GHz, its 3dB relative bandwidth is 50%, emulation and measured result are the most identical as we can see from the figure, and wherein the insertion loss of measurement error is bigger than normal is derived from mismachining tolerance and the slotted line radiation loss in test process.In difference mode signal passband, common-mode signal is all at below-40dB, has the highest common mode inhibition effect.
Fig. 6 is the group delay test result of described wideband balance microstrip filter.Group delay is the parameter describing broadband or ultra-wide band filter for the lag characteristic of signal.It can be seen that in difference mode signal passband, group delay changes in the interval of 0.4ns to 0.9ns, fluctuates the least, and group delay has the most smooth characteristic.
The above is only the preferred embodiment of the present invention, it is noted that for those skilled in the art, can also make some improvement under the premise without departing from the principles of the invention, and these improvement also should be regarded as protection scope of the present invention.
Claims (2)
1. a bimodulus balanced filter based on micro-strip slotted line structure, it is characterised in that comprise the first wave filter and the second wave filter；
Described first wave filter and the second wave filter all include the slotted line structure of microstrip line construction and the medium substrate lower floor being positioned at medium substrate upper strata；
The microstrip line construction of described first wave filter includes the first feeder line, the second feeder line, the first resonator and the second resonator, the slotted line structure of described first wave filter includes the first slotted line and the second slotted line, the microstrip line construction of described second wave filter comprises the 3rd feeder line, the 4th feeder line, the 3rd resonator and the 4th resonator, and the slotted line structure of described second wave filter comprises the 3rd slotted line and the 4th slotted line；
Described first to fourth resonator all uses bending structure, and a part is positioned at the upper strata of medium substrate, and another part is bent to medium substrate lower floor；
Described first resonator and the second resonator are parallel to each other, and are connected in one by being positioned at the metal level of medium substrate；
Described 3rd resonator and the 4th resonator are parallel to each other, and are connected in one by being positioned at the metal level of medium substrate；
The sections transverse that described first feeder line one end is positioned at medium substrate upper strata with described first resonator is connected and becomes L-type structure, the sections transverse that described second feeder line one end is positioned at medium substrate upper strata with described second resonator is connected and becomes L-type structure, and the other end of described first feeder line and the other end of described second feeder line partner input/output port；
The sections transverse that described 3rd feeder line one end is positioned at medium substrate upper strata with described 3rd resonator is connected and becomes L-type structure, the sections transverse that described 4th feeder line one end is positioned at medium substrate upper strata with described 4th resonator is connected and becomes L-type structure, and the other end of described 3rd feeder line and the other end of described 4th feeder line partner input/output port；
Second slotted line loads on the centre position of the first slotted line and parallel with the first slotted line；
4th slotted line loads on the centre position of the 3rd slotted line and parallel with the 3rd slotted line；
Described first wave filter and the second filter construction are identical, symmetrical, and wherein the first feeder line and the 3rd feeder line be symmetrical, the second feeder line and the 4th feeder line is symmetrical, the first resonator is symmetrical with the 3rd resonator, the second resonator is symmetrical with the 4th resonator, the second slotted line and the 4th slotted line symmetry, the first slotted line and the 3rd slotted line symmetry being connected on the plane of symmetry is integrally forming；
Described first to fourth feeder line structure is identical, equal sized；
Described first to fourth resonator structure is identical, equal sized；
Described first slotted line is identical, equal sized with described 3rd slotted line structure；
Described second slotted line is identical, equal sized with described 4th slotted line structure；
Described first to fourth resonator is quarter-wave resonance device.
Bimodulus balanced filter the most according to claim 1, it is characterised in that described first to fourth feeder line characteristic impedance is 50 ohm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410167229.4A CN103985926B (en) | 2014-04-24 | 2014-04-24 | A kind of bimodulus balanced filter based on micro-strip slotted line structure |
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| CN201410167229.4A CN103985926B (en) | 2014-04-24 | 2014-04-24 | A kind of bimodulus balanced filter based on micro-strip slotted line structure |
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| CN103985926B true CN103985926B (en) | 2016-08-24 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102820502A (en) * | 2012-08-07 | 2012-12-12 | 南通大学 | Balanced dual-pass band filter |
| CN103367845A (en) * | 2013-06-24 | 2013-10-23 | 南京航空航天大学 | Ultra-wideband micro-strip balance filter |
| TW201345036A (en) * | 2012-04-17 | 2013-11-01 | Univ Chienkuo Technology | Balanced dual-band band-pass filter with inhibited common-mode signal designed from SIR and open-stud |
| CN203883097U (en) * | 2014-04-24 | 2014-10-15 | 南京航空航天大学 | Dual-mode balance filter based on microstrip and slotted line structures |
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2014
- 2014-04-24 CN CN201410167229.4A patent/CN103985926B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201345036A (en) * | 2012-04-17 | 2013-11-01 | Univ Chienkuo Technology | Balanced dual-band band-pass filter with inhibited common-mode signal designed from SIR and open-stud |
| CN102820502A (en) * | 2012-08-07 | 2012-12-12 | 南通大学 | Balanced dual-pass band filter |
| CN103367845A (en) * | 2013-06-24 | 2013-10-23 | 南京航空航天大学 | Ultra-wideband micro-strip balance filter |
| CN203883097U (en) * | 2014-04-24 | 2014-10-15 | 南京航空航天大学 | Dual-mode balance filter based on microstrip and slotted line structures |
Non-Patent Citations (1)
| Title |
|---|
| Compact dual-notched balanced UWB BPF with folded triple-mode slotline resonator;Hong-wei Deng;《Electronics letters》;20140313;第50卷(第6期);447-449 * |
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