CN203351718U - Stepped impedance comb line balance microstrip band pass filter characterized by high selectivity and high common mode rejection - Google Patents
Stepped impedance comb line balance microstrip band pass filter characterized by high selectivity and high common mode rejection Download PDFInfo
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- CN203351718U CN203351718U CN 201320354777 CN201320354777U CN203351718U CN 203351718 U CN203351718 U CN 203351718U CN 201320354777 CN201320354777 CN 201320354777 CN 201320354777 U CN201320354777 U CN 201320354777U CN 203351718 U CN203351718 U CN 203351718U
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Abstract
The utility model provides a stepped impedance comb line balance microstrip band pass filter characterized by high selectivity and high common mode rejection, which is composed of two microstrip band pass filters. The two microstrip band pass filters are symmetrical to each other and mutually connected. Each microstrip band pass filter comprises a first 50-ohm feed line, a first microstrip line, and a first stepped impedance resonator which are sequentially connected. Each microstrip band pass filter further comprises a second 50-ohm feed line, a second microstrip line and a second stepped impedance resonator which are sequentially connected. A third stepped impedance resonator is coupled to the first stepped impedance resonator and a fourth stepped impedance resonator. The fourth stepped impedance resonator is coupled to the second stepped impedance resonator. The tail ends of the third stepped impedance resonator and the fourth stepped impedance resonator are located on a symmetric axis. The stepped impedance comb line balance microstrip band pass filter has the characteristics of novel structure, high selectivity, high common mode rejection, low insertion loss and low cost.
Description
technical field
The utility model relates to the stepped impedance pectinate line balance microstrip bandpass filter of a kind of high selectivity, high common mode inhibition, and it applies to wireless lan channel, belongs to the communications field.
background technology
The integrated level of Modern Communication System improves the noise caused in communication system and increases, and then make the signal to noise ratio of communication system reduce, balancing circuitry can efficiently suppress the noise of ambient noise and the generation of internal system active device, thereby is widely used in Modern Communication System.The balance micro-strip duplexer, as the final element of communication system, has filtering characteristic when difference mode signal is inputted, and has higher common mode inhibition capacity, can effectively reduce the impact of common-mode noise on system.Yet the conventional balanced filter forms by a single port filter and two barron structures, and so not only circuit area is huge, and the common mode noise rejection ability is poor.And if use bilateral microstrip coupled band line structure, can obtain very high common mode inhibition, but the defect brought thus is the increase of circuit size.And high selectivity is also to weigh an important indicator of a filter quality.
The utility model content
For above-mentioned technical problem, technical problem to be solved in the utility model is to provide the stepped impedance pectinate line balance microstrip bandpass filter of a kind of high selectivity, high common mode inhibition.
The utility model adopts following technical scheme for solving the problems of the technologies described above:
The stepped impedance pectinate line balance microstrip bandpass filter of a kind of high selectivity, high common mode inhibition, be operated in the wireless lan (wlan) channel.By being formed at two mutual axial symmetry on pcb board and the microstrip bandpass filter linked together, form, i.e. the first microstrip bandpass filter and the second microstrip bandpass filter, the first microstrip bandpass filter is identical with the second microstrip bandpass filter structure.Microstrip bandpass filter comprises 50 ohm of feeder lines one, 50 ohm of feeder lines two, microstrip line one, microstrip line two, step electric impedance resonator one, step electric impedance resonator two, step electric impedance resonator three, step electric impedance resonator four.Microstrip line is held one by one with 50 ohm of feeder lines one and is connected, and the other end is connected with step electric impedance resonator one.The other end of 50 ohm of feeder lines one can directly be used as port, also can make it be connected with port.Step electric impedance resonator one and the mutual embedding coupling of step electric impedance resonator three, also just say that the lug boss of step electric impedance resonator one and the recess of step electric impedance resonator three are coupled, the lug boss of the recess of step electric impedance resonator one and step electric impedance resonator three is coupled.The end of step electric impedance resonator three is positioned on symmetry axis, and the end that is to say the step electric impedance resonator three of the end of step electric impedance resonator three of the first band pass filter and the second band pass filter is connected and tie point is positioned on symmetry axis.50 ohm of feeder lines one, microstrip line one, step electric impedance resonator one, step electric impedance resonator three and 50 ohm of feeder lines, microstrip line two, step electric impedance resonator two, step electric impedance resonator four mirror image symmetries, that is to say that 50 ohm of feeder lines one, microstrip line one, step electric impedance resonator one, step electric impedance resonator three and 50 ohm of feeder lines, microstrip line two, step electric impedance resonator two, step electric impedance resonators four are symmetrical arranged side by side.Step electric impedance resonator three is coupled with step electric impedance resonator four.
The left side of 50 ohm of feeder lines one is port P1, and the right side of 50 ohm of feeder lines two is port P2.Due to 50 ohm of feeder lines one, microstrip line one, step electric impedance resonator one, step electric impedance resonator three and 50 ohm of feeder lines two, microstrip line two, step electric impedance resonator two, step electric impedance resonator four mirror image symmetries, port P1 and port P2 both can be used as output port, also can be used as input port; That is to say, as port P1, during as input port, P2 is just as output port; As port P2, during as input port, P1 is just as output port.
When the differential mode signal by two ports (P1 or P2) while entering the balance microstrip bandpass filter, the part of balance microstrip bandpass filter on symmetry axis is equivalent to short circuit grounding, and step electric impedance resonator three and step electric impedance resonator four ground connection on symmetry axis become the short circuit step electric impedance resonator.50 ohm of feeder lines one, microstrip line one and step electric impedance resonators one form input (output) parallel coupling feeder line, 50 ohm of feeder lines two, microstrip line two and step electric impedance resonators two form output (input) parallel coupling feeder line, now balance microstrip bandpass filter equivalence becomes a second order stepped impedance comb line filter, the transmission zero T that input, output parallel coupling feeder line and step electric impedance resonator three, step electric impedance resonator four couplings produce
z1, T
z2lay respectively in passband edge and upper stopband, can obtain higher passband selectivity and higher upper stopband inhibition.
When common-mode signal by two ports (P1 or P2) while entering the balance microstrip bandpass filter, balance microstrip bandpass filter coupling part on symmetry axis is equivalent to open circuit, step electric impedance resonator three and step electric impedance resonator four are opened a way on symmetry axis, step electric impedance resonator three and step electric impedance resonator four become the open circuit step electric impedance resonator, 50 ohm of feeder lines one and microstrip line one form input (output) tap feeder line and are connected on step electric impedance resonator one, 50 ohm of feeder lines two and microstrip line two form output (input) tap feeder lines and are connected on step electric impedance resonator two, now balance microstrip bandpass filter equivalence becomes a quadravalence parallel coupling stepped impedance filter, due to step electric impedance resonator one, step electric impedance resonator two and step electric impedance resonator three, the resonance frequency of step electric impedance resonator four is different and all there is no resonance point at wireless lan channel, so can obtain common mode inhibition effect preferably.
As further improvement of the utility model: add step electric impedance resonator five respectively between the step electric impedance resonator three of two microstrip bandpass filters and step electric impedance resonator four.Step electric impedance resonator five is placed side by side with step electric impedance resonator four, because step electric impedance resonator three and step electric impedance resonator four are symmetrical arranged, the lug boss of step electric impedance resonator five is identical on the left side or the right of step electric impedance resonator five to the effect that this programme rose.The end of step electric impedance resonator five is positioned on symmetry axis, and the end that is to say the step electric impedance resonator five of the end of step electric impedance resonator five of the first band pass filter and the second band pass filter is connected and tie point is positioned on symmetry axis.Step electric impedance resonator five is coupled with step electric impedance resonator three, step electric impedance resonator four, cross-couplings between step electric impedance resonator three and step electric impedance resonator four.When the differential mode signal by two ports (P1 or P2) while entering the balance microstrip bandpass filter, balance filter coupling part on symmetry axis is equivalent to short circuit grounding, now step electric impedance resonator three, step electric impedance resonator four, step electric impedance resonator five ground connection on symmetry axis becomes the short circuit step electric impedance resonator, now balance microstrip bandpass filter equivalence becomes three rank stepped impedance comb line filter, on the basis of second order stepped impedance comb line filter, the new transmission zero T that step electric impedance resonator three not adjacent to each other and step electric impedance resonator four cross-couplings produce
z3be positioned at passband edge, the further like this selectivity that improves passband.When common-mode signal by two ports (P1 or P2) while entering the balance microstrip bandpass filter, balance microstrip bandpass filter coupling part on symmetry axis is equivalent to open circuit, now step electric impedance resonator three, step electric impedance resonator four and step electric impedance resonator five ground connection on symmetry axis become the open circuit step electric impedance resonator, now balance microstrip bandpass filter equivalence becomes the five parallel resistance coupling in rank stepped impedance filters, on the basis of the parallel resistance coupling of quadravalence stepped impedance filter, because the increase of exponent number, so can obtain better common mode inhibition effect.
As of the present utility model, further improve again: add a plurality of step electric impedance resonators that are arranged side by side five between the step electric impedance resonator three of microstrip bandpass filter and step electric impedance resonator four, that is to say to there is N(N between step electric impedance resonator three and step electric impedance resonator four and be greater than 1) individual step electric impedance resonator five.Between a plurality of step electric impedance resonators five, intercouple.The balance microstrip bandpass filter is equivalent to a N+2 rank stepped impedance comb line filter, can introduce new respective transmissions zero point in upper passband edge by the cross-couplings between a plurality of step electric impedance resonators not adjacent to each other under difference mode signal, and along with the increase of exponent number step by step near upper passband edge, thereby improve step by step the selectivity of passband.The balance microstrip bandpass filter is equivalent to a N+4 rank parallel coupling stepped impedance filter under common-mode signal, due to improving constantly of balance microstrip bandpass filter exponent number, from and further improve common mode inhibition.
Technique scheme compared with prior art, has following beneficial effect.
1, film suppresses high altogether.
2, frequency selectivity can be high.
3, cost is low: because this filter construction only consists of the additional upper and lower double layer of metal coating of single-layer medium plate, so can adopt very ripe single-layer printed circuit plate (PCB) processing technology at present produces, add the characteristics of its miniaturization, make whole board dimension less, processing cost is very cheap.
4, be easy to integrated: what adopt due to this filter is microstrip structure, and volume is little, lightweight, therefore is easy to other circuit integrated.
The accompanying drawing explanation
Fig. 1 is the schematic diagram of single-layer printed circuit plate.
Fig. 2 is the schematic diagram of second order balance microstrip filter.
Fig. 3 is the schematic diagram of three rank balance microstrip filters.
Fig. 4 is the schematic diagram of N rank balance microstrip filter.
Fig. 5 is the isoboleses of three rank balance microstrip filters under difference mode signal.
Fig. 6 is the isoboleses of three rank balance microstrip filters under common-mode signal.
Fig. 7 is second order balance microstrip filter HFSS software S parameters simulation result.
Fig. 8 is three rank balance microstrip filter HFSS software S parameters simulation results.
Fig. 9 is that second order balance microstrip filter is by the S parameter measured result of vector network analyzer.
Figure 10 is that three rank balance microstrip filters are by the S parameter measured result of vector network analyzer.
The Reference numeral title is as follows: 1, the first band pass filter; 2, the second band pass filter; 3,50 ohm of feeder lines one; 4,50 ohm of feeder lines two; 5, microstrip line one; 6, microstrip line two; 7, step electric impedance resonator one; 8, step electric impedance resonator two; 9, step electric impedance resonator three; 10, step electric impedance resonator four; 11, step electric impedance resonator five; 12, upper metal patch; 13, dielectric substrate; 14, lower metal patch.
Embodiment
For sake of convenience, hereinafter alleged " on ", D score, " left side ", " right side " be consistent with the upper and lower, left and right direction of accompanying drawing itself, but structure of the present utility model do not played to the restriction effect.
Enforcement below in conjunction with accompanying drawing to technical scheme is described in further detail.
The stepped impedance pectinate line balance microstrip filter that the utility model is a kind of high selectivity, high common mode inhibition, its output port and input port are respectively with the welding of SMA head, so that access test or practical devices.
As shown in Figure 1: it is 2.2 that the present invention adopts relative dielectric constant, and the pcb board that thickness is 0.508mm, as substrate, also can adopt the pcb board of other specifications as substrate.Upper and lower surface at the dielectric substrate 13 of pcb board is coated with respectively metal patch 12 and lower metal patch 14.
As shown in Figure 2, second order balance microstrip bandpass filter forms by being formed on pcb board mutually axial symmetry and interconnective two microstrip filters, i.e. the first microstrip bandpass filter 1 and the second microstrip bandpass filter 2.The first band pass filter 1 and the second band pass filter 2 be take AA` as the symmetry axis symmetry.The first band pass filter 1 comprises one 3,50 ohm of feeder lines 24 of 50 ohm of feeder lines, microstrip line 1, microstrip line 26, step electric impedance resonator 1, step electric impedance resonator 28, step electric impedance resonator 39, step electric impedance resonator 4 10.50 ohm of feeder line one 3 one ends are port P1, and the other end is connected with microstrip line 1.The other end of microstrip line 1 is connected with step electric impedance resonator 1.Step electric impedance resonator 1 and the mutual embedding coupling of step electric impedance resonator 39, be that the lug boss of step electric impedance resonator one and the recess of step electric impedance resonator three are coupled, the lug boss of the recess of step electric impedance resonator one and step electric impedance resonator three is coupled.50 ohm of feeder lines 1, microstrip line 1, step electric impedance resonator 1, step electric impedance resonator 39 and 50 ohm of feeder lines 24, microstrip line 26, step electric impedance resonator 28, step electric impedance resonator 4 10 mirror image symmetries.One end of 50 ohm of feeder lines 24 is port P2, and the other end is connected with microstrip line 26.The other end of microstrip line 26 is connected with step electric impedance resonator 28.Step electric impedance resonator 28 and the mutual embedding coupling of step electric impedance resonator 4 10.Step electric impedance resonator 39 intercouples with step electric impedance resonator 4 10.The structure of the second band pass filter 2 is identical with the structure of the first band pass filter 1.The end of the first microstrip bandpass filter 1 step electric impedance resonator 39 is connected with the end of the second microstrip bandpass filter 2 step electric impedance resonators 39, and tie point is positioned on symmetry axis AA`.The end of the first microstrip bandpass filter 1 step electric impedance resonator 4 10 is connected with the end of the second microstrip bandpass filter 2 step electric impedance resonators 4 10, and tie point is positioned on symmetry axis AA`.
As shown in Figure 3: the first microstrip bandpass filter 1 and the second microstrip bandpass filter 2 have respectively increased a step electric impedance resonator 5 11, step electric impedance resonator 5 11 is between step electric impedance resonator 39 and step electric impedance resonator 4 10, and be arranged side by side with step electric impedance resonator 4 10, formed three rank balance microstrip bandpass filters.Step electric impedance resonator 5 11 is coupled with step electric impedance resonator 39, step electric impedance resonator 4 10 respectively, step electric impedance resonator 39 and step electric impedance resonator 4 10 cross-couplings.The end of the first microstrip bandpass filter 1 step electric impedance resonator 5 11 is connected with the end of the second microstrip bandpass filter 2 step electric impedance resonators 5 11, and tie point to be positioned at symmetry axis AA` upper, and the two take AA` as the symmetry axis symmetry.
Fig. 4 is N(N > 2) rank balance microstrip filter.Respectively increased N-2 step electric impedance resonator 5 11 at the first microstrip bandpass filter 1 and the second microstrip bandpass filter 2.N-2 step electric impedance resonator 5 11, between step electric impedance resonator 39 and step electric impedance resonator 4 10, is arranged side by side with step electric impedance resonator 4 10.And with step electric impedance resonator 39, step electric impedance resonator 4 10, be coupled respectively, between N-2 step electric impedance resonator 5 11, also intercouple.The end of the first microstrip bandpass filter 1 step electric impedance resonator 5 11 is connected with the end of corresponding the second microstrip bandpass filter 2 step electric impedance resonators 5 11, and it is upper that tie point is positioned at symmetry axis AA`, and two step electric impedance resonators 5 11 be take AA` as the symmetry axis symmetry.
As shown in Figure 5: when the differential mode signal enters balance filter by two P1 or P2 port, balance filter link portions on the AA` symmetry axis is divided and is equivalent to short circuit grounding, step electric impedance resonator three, step electric impedance resonator four and step electric impedance resonator five ground connection on the AA` symmetry axis becomes the short circuit step electric impedance resonator, and now the utility model balance filter equivalence becomes three rank stepped impedance comb line filter.
As shown in Figure 6: when common-mode signal enters balance filter by two P1 or P2 port, balance filter link portions on the AA` symmetry axis is divided and is equivalent to open circuit, step electric impedance resonator three, step electric impedance resonator four and step electric impedance resonator five ground connection on the AA` symmetry axis becomes the open circuit step electric impedance resonator, and now the utility model balance filter equivalence becomes the five parallel resistance coupling in rank stepped impedance filters.
As shown in Figure 7: second order balance microstrip filter HFSS software S parameters simulation result: comprise difference mode signal return loss plot S
dd11,difference mode signal insertion loss curve S
dd21, common-mode signal insertion loss curve S
cc21.As seen from the figure, the differential mode passband relative bandwidth that centre frequency is 2.45GHz is 8%, the transmission zero T of upper passband edge
z1reach-72dB transmission zero T
z2reach-68dB, in the 11.5GHz scope on stopband suppress be better than-25dB.Be better than-27dB of common mode inhibition in whole frequency range, and be better than-32dB of common mode inhibition in the differential mode passband.
As shown in Figure 8: three rank balance microstrip filter HFSS software S parameters simulation results: comprise difference mode signal return loss plot S
dd11,difference mode signal insertion loss curve S
dd21, common-mode signal insertion loss curve S
cc21.As seen from the figure, the differential mode passband relative bandwidth that centre frequency is 2.45GHz is 8%, the new transmission zero T of adjacent upper passband edge
z3reach-60dB is to obtain the selectivity of better differential mode passband, transmission zero T
z2reach-78dB, in the 11.5GHz scope on stopband suppress be better than-25dB.Be better than-34dB of common mode inhibition in whole frequency range, and be better than-42dB of common mode inhibition in the differential mode passband, reach very high common mode inhibition effect.
As shown in Figure 9: second order balance microstrip filter is by the S parameter measured result of vector network analyzer: comprise difference mode signal return loss plot S
dd11,difference mode signal insertion loss curve S
dd21, common-mode signal insertion loss curve S
cc21.Measured result and simulation result are substantially identical.
As shown in figure 10: three rank balance microstrip filters are by the S parameter measured result of vector network analyzer: comprise difference mode signal return loss plot S
dd11,difference mode signal insertion loss curve S
dd21, common-mode signal insertion loss curve S
cc21.Measured result and simulation result are substantially identical.
Claims (3)
1. a high selectivity, the stepped impedance pectinate line balance microstrip bandpass filter of high common mode inhibition, it is characterized in that: by being formed at two mutual axial symmetry on pcb board and the microstrip bandpass filter linked together, form, i.e. the first microstrip bandpass filter (1) and the second microstrip bandpass filter (2), the first microstrip bandpass filter (1), the second microstrip bandpass filter (2) comprises 50 ohm of feeder lines one (3), 50 ohm of feeder lines two (4), microstrip line one (5), microstrip line two (6), step electric impedance resonator one (7), step electric impedance resonator two (8), step electric impedance resonator three (9), step electric impedance resonator four (10), microstrip line one (5) one end is connected with 50 ohm of feeder lines one (3), the other end is connected with step electric impedance resonator one (7), step electric impedance resonator one (7) and the mutual embedding coupling of step electric impedance resonator three (9), the end of step electric impedance resonator three (9) is positioned on symmetry axis, 50 ohm of feeder lines one (3), microstrip line one (5), step electric impedance resonator one (7), step electric impedance resonator three (9) and 50 ohm of feeder lines two (4), microstrip line two (6), step electric impedance resonator two (8), step electric impedance resonator four (10) mirror image symmetries, step electric impedance resonator three (9) is coupled with step electric impedance resonator four (10).
2. balance microstrip bandpass filter according to claim 1, it is characterized in that: the first microstrip bandpass filter (1), the second microstrip bandpass filter (2) also comprises step electric impedance resonator five (11), step electric impedance resonator five (11) is placed side by side with step electric impedance resonator four (10), step electric impedance resonator five (11) is positioned between step electric impedance resonator three (9) and step electric impedance resonator four (10), step electric impedance resonator five (11) and step electric impedance resonator three (9), step electric impedance resonator four (10) is coupled, cross-couplings between step electric impedance resonator three (9) and step electric impedance resonator four (10), the end of step electric impedance resonator five (11) is positioned on symmetry axis.
3. balance microstrip bandpass filter according to claim 2, is characterized in that: a plurality of step electric impedance resonators that are arranged side by side five (11) are arranged between step electric impedance resonator three (9) and step electric impedance resonator four (10).
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326091A (en) * | 2013-06-20 | 2013-09-25 | 南京航空航天大学 | Ladder impedance pectinate line balance micro-band band-pass filter with high selectivity and high common-mode rejection |
| CN104051829A (en) * | 2014-06-24 | 2014-09-17 | 中国科学院微电子研究所 | Miniaturization dual-band band-pass filter based on ladder impedance |
| CN108155447A (en) * | 2017-12-14 | 2018-06-12 | 南京航空航天大学 | Highly selective, high common mode inhibition and compact-sized second order balance bandpass filter |
| WO2018171231A1 (en) * | 2017-03-18 | 2018-09-27 | 深圳市景程信息科技有限公司 | Dual-band band-pass filter based on open loads and short-circuit loads |
| CN110212274A (en) * | 2019-06-28 | 2019-09-06 | 南京航空航天大学 | Balance bimodule band-pass filter based on double-layer substrate integration waveguide |
-
2013
- 2013-06-20 CN CN 201320354777 patent/CN203351718U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326091A (en) * | 2013-06-20 | 2013-09-25 | 南京航空航天大学 | Ladder impedance pectinate line balance micro-band band-pass filter with high selectivity and high common-mode rejection |
| CN103326091B (en) * | 2013-06-20 | 2015-07-29 | 南京航空航天大学 | The stepped impedance pectinate line balance microstrip bandpass filter of a kind of high selectivity, high common mode inhibition |
| CN104051829A (en) * | 2014-06-24 | 2014-09-17 | 中国科学院微电子研究所 | Miniaturization dual-band band-pass filter based on ladder impedance |
| WO2018171231A1 (en) * | 2017-03-18 | 2018-09-27 | 深圳市景程信息科技有限公司 | Dual-band band-pass filter based on open loads and short-circuit loads |
| CN108155447A (en) * | 2017-12-14 | 2018-06-12 | 南京航空航天大学 | Highly selective, high common mode inhibition and compact-sized second order balance bandpass filter |
| CN110212274A (en) * | 2019-06-28 | 2019-09-06 | 南京航空航天大学 | Balance bimodule band-pass filter based on double-layer substrate integration waveguide |
| CN110212274B (en) * | 2019-06-28 | 2021-03-16 | 南京航空航天大学 | Balanced dual-mode band-pass filter based on double-layer substrate integrated waveguide |
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Granted publication date: 20131218 Effective date of abandoning: 20150729 |
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