CN103904389A - Compact micro-strip balance filter based on slotted line structures - Google Patents
Compact micro-strip balance filter based on slotted line structures Download PDFInfo
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- CN103904389A CN103904389A CN201410092197.6A CN201410092197A CN103904389A CN 103904389 A CN103904389 A CN 103904389A CN 201410092197 A CN201410092197 A CN 201410092197A CN 103904389 A CN103904389 A CN 103904389A
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Abstract
The invention discloses a compact micro-strip balance filter based on slotted line structures. The compact micro-strip balance filter based on the slotted line structures comprises a first filter and a second filter, wherein the first filter and the second filter are formed on a dielectric substrate The first filter and the second filter respectively comprise a micro-strip line structure located on the upper layer of the dielectric substrate and a slotted line located on the lower layer of the dielectric substrate. The first filter and the second filter are the same in structure and are symmetric mutually. The slotted line of the first filter is integrally connected with the slotted line of the second filter. The compact micro-strip balance filter has a very wide difference mode signal passband which internally has the very high common-mode rejection characteristic, a circuit is simple, and machining is easy.
Description
Technical field
The invention belongs to communication technical field, particularly the micro-band balance filter of a kind of compact based on slotted line structure.
Background technology
The fast development of Modern Communication System is had higher requirement to the performance of filter, miniaturization, and high-performance, wide band filter is the requisite part of communication system.Balance filter requires signal transmission under difference mode signal excitation, and suppresses as far as possible the transmission of common-mode signal.Internal noise and the ambient noise of system mostly are common-mode signal, thereby compared with common single-ended filter, balance filter has larger advantage aspect noise suppressed.
Traditional balance filter consists of filter and two barron structures of a single port, so not only makes the size of filter very large, and also very poor to the inhibition of common-mode signal, is unfavorable for the miniaturization of system.Existing balance filter great majority are for narrowband systems, and broadband and super-broadband tech are more and more applied with its data transmission efficiency and low-power consumption at a high speed.The design of wideband balance filter is relatively complicated, accomplishes, in very wide frequency band, common-mode signal is had to very high inhibition because be difficult to.How increasing the difference mode signal passband width of balance filter and improving common-mode signal inhibition is the difficult point of studying at present.
Summary of the invention
The problem existing in order to solve above-mentioned background technology, the present invention aims to provide the micro-band balance filter of a kind of compact based on slotted line structure, improves the common-mode signal inhibition of balance filter.
In order to realize above-mentioned technical purpose, technical scheme of the present invention is:
The micro-band balance filter of a kind of compact based on slotted line structure, comprise the first filter and the second filter that are formed on medium substrate, described the first filter and the second filter all comprise the microstrip line construction that is positioned at medium substrate upper strata and the slotted line that is positioned at medium substrate lower floor, the first filter is identical with the second filter construction, symmetry and size equate, the slotted line of the slotted line of the first filter and the second filter connects as one side by side on its plane of symmetry.
Wherein, the microstrip line construction of above-mentioned the first filter comprises the first feeder line, the second feeder line, the first resonator and the second resonator, described the first feeder line is parallel with the second feeder line, the first resonator is all parallel with the slotted line of the first filter with the second resonator, the vertical L-type structure that is connected in one end of the short-circuit end of the first resonator and the first feeder line, the other end of the first feeder line is as input port, the vertical L-type structure that is connected in one end of the short-circuit end of the second resonator and the second feeder line, the other end of the second feeder line is as output port.
Wherein, the characteristic impedance of above-mentioned the first feeder line and the second feeder line is 50 ohm.
Wherein, above-mentioned the first resonator and the second resonator are quarter-wave resonance device.
The beneficial effect that adopts technique scheme to bring is:
The present invention adopts slotted line structure, and in common-mode signal transmission, slotted line is destructurized, thereby has very high common-mode signal inhibition ability.What the present invention adopted is microstrip structure, is convenient to processing, and cost is low, and volume is little, is easy to carry out integrated with other circuit.
Brief description of the drawings
Fig. 1 is the tangent plane schematic diagram of single-layer printed circuit plate of the present invention.
Fig. 2 is the microstrip line construction schematic diagram of upper metal level of the present invention.
Fig. 3 is the slotted line schematic diagram of lower metal layer of the present invention.
Fig. 4 is the equivalent electric circuit of the upper metal level of the present invention under difference mode signal excitation.
Fig. 5 is the equivalent electric circuit of the lower metal layer of the present invention under difference mode signal excitation.
Fig. 6 is the equivalent electric circuit of the upper metal level of the present invention under common-mode signal excitation.
Fig. 7 is the equivalent electric circuit of the lower metal layer of the present invention under common-mode signal excitation.
Fig. 8 is that the present invention accesses sub-miniature A connector test and for convenience by the manuscript of feeder line bending.
Fig. 9 is difference mode signal insertion loss curve S of the present invention
dd21and difference mode signal return loss plot S
dd11with common-mode signal insertion loss curve S
cc21emulation and measurement result figure.
Figure 10 is group delay test result figure of the present invention.
Main symbol description in accompanying drawing:
A1: the first feeder line; A2: the first resonator; A3: the second feeder line; A4: the second resonator;
A5: the first slotted line; B1: the 3rd feeder line; B2: the 3rd resonator; B3: the 4th feeder line; B4: the 4th resonator; B5: the second slotted line; C1: metal level on substrate; C2: substrate lower metal layer; C3: dielectric substrate; Pin1: first input end mouth; Pin2: the second input port; Pout1: the first output port; Pout2: the second output port.
Embodiment
Below with reference to accompanying drawing, technical scheme of the present invention is elaborated.
The micro-band balance filter of a kind of compact based on slotted line structure, comprise the first filter and the second filter that are formed on medium substrate, described the first filter and the second filter all comprise the microstrip line construction that is positioned at medium substrate upper strata and the slotted line that is positioned at medium substrate lower floor, the first filter is identical with the second filter construction and symmetrical mutually, and the slotted line of the slotted line of the first filter and the second filter connects as one.
It is 2.2 that the present embodiment adopts relative dielectric constant, and the pcb board that thickness is 0.508mm is as medium substrate.The tangent plane schematic diagram of single-layer printed circuit plate of the present invention as shown in Figure 1, is covered with respectively metal level C1 and lower metal layer C2 on the upper and lower surface of the dielectric substrate C3 of pcb board.Described tight microstrip line construction is metal level C1, the i.e. etching formation on lower metal layer C2 of slotted line.
Fig. 2 is the microstrip line construction schematic diagram of the present embodiment, and Fig. 3 is slotted line schematic diagram, and wherein the first filter comprises the first feeder line A1 shown in Fig. 2, the second feeder line A3, the first resonator A2, the second resonator A4, and the first slotted line A5 shown in Fig. 3; Wherein the short-circuit end of the first resonator A2 with vertical being connected of one end of the first feeder line A1 become L-type structure, the other end of the first feeder line A1 is as first input end mouth Pin1, the short-circuit end of the second resonator A4 with vertical being connected of one end of the second feeder line A3 become L-type structure, the other end of the second feeder line A3 is as the first output port Pout1, the first feeder line A1 and the second feeder line A3 are parallel to each other as the bottom of two L-type structures, and the first resonator A2 and the second resonator A4 are all parallel to the first slotted line A5.Described the second filter comprises the 3rd feeder line B1 shown in Fig. 2, the 4th feeder line B3, the 3rd resonator B2, the 4th resonator B4, and the second slotted line B5 shown in Fig. 3; Wherein the 3rd resonator B2 with vertical being connected of one end of the 3rd feeder line B1 become L-type structure, the other end of the 3rd feeder line B1 is as input port Pin2, the 4th resonator B4 with vertical being connected of one end of the 4th feeder line B3 become L-type structure, the other end of the 4th feeder line B3 is as the second output port Pout2, the 3rd feeder line B1 and the 4th feeder line B3 are parallel to each other as the bottom of two L-type structures, and the 3rd resonator B2 and the 4th resonator B4 are all parallel to the second slotted line B5.
The first filter and the second filter are symmetrical, structure is identical, the first feeder line A1 and the 3rd feeder line B1 symmetry, the second feeder line A3 and the 4th feeder line B3 symmetry, the first resonator A2 and the 3rd resonator B2 symmetry, the second resonator A4 and the 4th resonator B4 symmetry, the first slotted line A5 and the second slotted line B5 are symmetrical and interconnect and become one.
In the present embodiment, the first resonator A2, the second resonator A4, the 3rd resonator B2, the 4th resonator all adopt quarter-wave resonance device, and the characteristic impedance of the first feeder line A1, the second feeder line A3, the 3rd feeder line B1, the 4th feeder line B3 is 50 ohm.Output port and input port all adopt the welding of SMA head, so that access is tested or is connected with other circuit.
In the time that difference mode signal enters system from input port Pin1 and input port Pin2, on plane of symmetry OPP ' O ', be equivalent to short-circuit condition, as shown in Figure 4 and Figure 5, wherein Fig. 4 is upper metallic layer circuit equivalent structure to its equivalent electric circuit, and Fig. 5 is lower metal layer circuit equivalent structure.Now between the first slotted line A5 and the second slotted line B5, be equivalent to short circuit, slotted line still keeps original structure, and described balance filter is equivalent to the filter of a two-port, the explanation as an example of the first filter example, without loss of generality.The first feeder line A1 and the first resonator A2 junction are equivalent to short circuit, now the first resonator A2 is quarter-wave, in like manner in the second feeder line A3 and the second resonator A4, now the first slotted line A5 and the first resonator A2, the second resonator A4 intercouples and forms three rank filters, and difference mode signal can normal transmission.In like manner in the second filter.
In the time that common-mode signal enters system from input port Pin1 and input port Pin2, on plane of symmetry OPP ' O ', present open-circuit condition, as shown in Figure 6 and Figure 7, wherein Fig. 6 is upper metallic layer circuit equivalent structure to its equivalent electric circuit, and Fig. 7 is lower metal layer circuit equivalent structure.Now between the first slotted line A5 and the second slotted line B5, be equivalent to open circuit, this open circuit has destroyed the first slotted line A5(or the second slotted line B5) structure, make it to be equivalent to has infinitely-great fluting after symmetry axis, destroy coupled structure, make the common-mode signal cannot normal transmission, thereby reach good common-mode signal inhibition.
Fig. 8 is medium substrate upper strata printed circuit diagram used while processing test.In actual processing test, original circuit is because the distance between input port Pin1 and output port Pout1 is less, in like manner in input port Pin2 and output port Pout2, for fear of influencing each other between two ports in test, by the first feeder line A1 and the second feeder line A3, the 3rd feeder line B1 and the 4th feeder line B3, bend respectively, thereby the distance between port is increased.This does not change the filtering performance of filter, is just convenient to access test.
Fig. 9 is the difference mode signal insertion loss curve S of the present embodiment
dd21and difference mode signal return loss plot S
dd11with common-mode signal insertion loss curve S
cc21emulation and measurement result figure, abscissa is frequency, and unit is GHz, and ordinate is gain, and unit is decibel.Described balance filter actual measurement is consistent with simulation result as seen from the figure, has 61.2% relative bandwidth, more than common mode inhibition reaches 38dB in difference mode signal passband at 4.3GHz place.
Figure 10 is the group delay test result figure of the present embodiment, and abscissa is frequency, and unit is GHz, and ordinate is group delay, and unit is nanosecond.Visible in difference mode signal passband, group delay converts between 0.35ns-0.47ns, and group delay is very little and smooth.
Above embodiment only, for explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought proposing according to the present invention, and any change of doing on technical scheme basis, within all falling into protection range of the present invention.
Claims (4)
1. the micro-band balance filter of the compact based on slotted line structure, it is characterized in that: comprise the first filter and the second filter that are formed on medium substrate, described the first filter and the second filter all comprise the microstrip line construction that is positioned at medium substrate upper strata and the slotted line that is positioned at medium substrate lower floor, the first filter is identical and symmetrical with the structure of the second filter, and the slotted line of the slotted line of the first filter and the second filter connects as one.
2. the micro-band balance filter of a kind of compact based on slotted line structure according to claim 1, it is characterized in that: the microstrip line construction of described the first filter comprises the first feeder line, the second feeder line, the first resonator and the second resonator, described the first feeder line is parallel with the second feeder line, the first resonator is all parallel with the slotted line of the first filter with the second resonator, the vertical L-type structure that is connected in one end of the short-circuit end of the first resonator and the first feeder line, the other end of the first feeder line is as input port, the vertical L-type structure that is connected in one end of the short-circuit end of the second resonator and the second feeder line, the other end of the second feeder line is as output port.
3. the micro-band balance filter of a kind of compact based on slotted line structure according to claim 2, is characterized in that: the characteristic impedance of described the first feeder line and the second feeder line is 50 ohm.
4. the micro-band balance filter of a kind of compact based on slotted line structure according to claim 2, is characterized in that: described the first resonator and the second resonator are quarter-wave resonance device.
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| CN201410092197.6A CN103904389B (en) | 2014-03-13 | 2014-03-13 | The micro-band balance filter of a kind of compact based on slotted line structure |
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| CN201410092197.6A CN103904389B (en) | 2014-03-13 | 2014-03-13 | The micro-band balance filter of a kind of compact based on slotted line structure |
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| CN103904389A true CN103904389A (en) | 2014-07-02 |
| CN103904389B CN103904389B (en) | 2016-05-04 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5825263A (en) * | 1996-10-11 | 1998-10-20 | Northern Telecom Limited | Low radiation balanced microstrip bandpass filter |
| WO2010061080A1 (en) * | 2008-11-28 | 2010-06-03 | Arnaud Sauvaget | Class of dual mode resonators made from a multilayer stack of organic laminates improving the performance and compactness of integrated passive components |
| CN103296346A (en) * | 2013-05-24 | 2013-09-11 | 南京航空航天大学 | Micro-strip balanced filter |
| CN103367845A (en) * | 2013-06-24 | 2013-10-23 | 南京航空航天大学 | Ultra-wideband micro-strip balance filter |
| CN203813003U (en) * | 2014-03-13 | 2014-09-03 | 南京航空航天大学 | Compact type microstrip balance filter based on slotted line structure |
-
2014
- 2014-03-13 CN CN201410092197.6A patent/CN103904389B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5825263A (en) * | 1996-10-11 | 1998-10-20 | Northern Telecom Limited | Low radiation balanced microstrip bandpass filter |
| WO2010061080A1 (en) * | 2008-11-28 | 2010-06-03 | Arnaud Sauvaget | Class of dual mode resonators made from a multilayer stack of organic laminates improving the performance and compactness of integrated passive components |
| CN103296346A (en) * | 2013-05-24 | 2013-09-11 | 南京航空航天大学 | Micro-strip balanced filter |
| CN103367845A (en) * | 2013-06-24 | 2013-10-23 | 南京航空航天大学 | Ultra-wideband micro-strip balance filter |
| CN203813003U (en) * | 2014-03-13 | 2014-09-03 | 南京航空航天大学 | Compact type microstrip balance filter based on slotted line structure |
Non-Patent Citations (3)
| Title |
|---|
| CHING-HER LEE ET AL: "Band-Notched Balanced UWB BPF With Stepped-Impedance Slotline Multi-Mode Resonator", 《IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS》 * |
| R. LI AND L. ZHU: "Ultra-wideband (UWB) bandpass filters with hybrid microstrip/slotline structures", 《IEEE MICROW. WIRELESS COMPON. LETT.》 * |
| YEN-JU LU ET AL: "A Differential-Mode Wideband Bandpass Filter With Enhanced Common-Mode Suppression Using Slotline Resonator", 《IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS》 * |
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