CN204596927U - A kind of restructural two-band band stop filter - Google Patents
A kind of restructural two-band band stop filter Download PDFInfo
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- CN204596927U CN204596927U CN201520256528.5U CN201520256528U CN204596927U CN 204596927 U CN204596927 U CN 204596927U CN 201520256528 U CN201520256528 U CN 201520256528U CN 204596927 U CN204596927 U CN 204596927U
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Abstract
The utility model discloses a kind of restructural two-band band stop filter, comprise microstrip line construction and the active circuit on upper strata, the medium substrate in middle level, the grounded metal paster of lower floor and metal throuth hole, metal throuth hole runs through microstrip line construction successively, medium substrate and grounded metal paster, microstrip line construction comprises main transmission line, first resonator, second resonator, 3rd resonator and the 4th resonator, main transmission line bending fold becomes the right and left symmetrical, middle part is to recessed structure, first resonator and the second resonator are after bending fold, be separately positioned on lower left and the lower right of main transmission line, and the formation one group of resonator that is coupled, 3rd resonator and the 4th resonator, after bending fold, are arranged on on recessed position in the middle part of main transmission line, and coupling forms another group resonator, the short-circuit end of each resonator is loaded with a variable capacitance diode.Filter construction of the present utility model is compact, achieves the independent restructural of two stopbands and constant absolute bandwidth.
Description
Technical field
The utility model relates to a kind of band stop filter, and especially a kind of restructural two-band band stop filter with constant absolute bandwidth being applied in double frequency front end system, belongs to technical field of micro communication.
Background technology
Along with the fast development of information technology, the high function simultaneously of integration density is many, small-sized, the radio terminal of light weight, high stability, low cost and low-power consumption becomes the main direction of studying of wireless communication field.At radio-frequency front-end, multifrequency or tunable filter as the Primary Component in multifrequency/frequency hopping transceiver, can effectively the noise of each frequency range of filtering and various unwanted signal, reduce between channel and disturb, realize high quality communication.In practical application, the reconfigurable filter of constant absolute bandwidth plays even more important role.The feature that restructural Double-frequency band elimination filter has dual-attenuation independence restructural, frequency tuning Time Bandwidth maintains relative constancy of constant absolute bandwidth, 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.
The restructural band stop filter of constant absolute bandwidth has obtained the concern of some scholars at present, it is also proposed several different method for designing:
1) people such as Ching-Wen Tang in 2015 has delivered " A Compact Tunable Notch Filter With Wide Constant Absolute Bandwidth " on IEEE Microw.Wireless Compon.Lett., what article adopted is that the mode that minor matters load produces stopband, minor matters replace with variable capacitance diode and chip inductor substantially completely, achieve the band stop filter of the frequency-adjustable of a single-order, its advantage is small-sized, frequency-tuning range is large, stopband absolute bandwidth substantially constant.
2) 2012, the people such as domestic scholars Zhang Xiuyin have delivered " RF TunableBandstop Filters With Constant Bandwidth Based on a Doublet Configuration " on IEEE Trans.Ind.Electron., article proposes a kind of bandreject filtering module of constant absolute bandwidth, its frequency-adjustable and absolute bandwidth substantially constant.Adopt multiple this filtration module cascade can realize the band stop filter of a high-order.Although cascade can obtain the stopband of high-order, volume increases exponentially thereupon.
3) 2009, in " A CompactE-Shaped Patterned Ground Structure and Its Applications to Tunable Bandstop Resonator " article that the people such as Shao Ying Huang deliver on IEEE Transaction on MTT, based on follow-on defect ground structure, employ the tunable band-stop filter of a variable capacitance diode designing load single-order, its advantage is that size is smaller, has the achievement in research of many tunable band-stop filters all to design based on defect ground structure at present.
Published prior art relates to restructural single-frequency band stop filter more, and the restructural Double-frequency band elimination filter being applicable to double-frequency communication system is few, institute's extracting method and structure and the limited capacity realized.Same published prior art relates to single order band stop filter more, and restructural band stop filter more than second order and second order is few, institute's extracting method and structure and the limited capacity realized.Be more the reconfigurable filter of constant absolute bandwidth in practical application, namely during frequency tuning, absolute bandwidth keeps relative constancy, and current published prior art does not realize all constant restructural band stop filter of two frequency range absolute bandwidths substantially.
Utility model content
The purpose of this utility model is the defect in order to solve above-mentioned prior art, provide a kind of restructural two-band band stop filter, this filter construction is compact, achieves two reconfigurable second order stopbands of independence, and all keep constant absolute bandwidth when frequency tuning, be with outer transporting good.
The purpose of this utility model can reach by taking following technical scheme:
A kind of restructural two-band band stop filter, comprise microstrip line construction and the active circuit on upper strata, the medium substrate in middle level, the grounded metal paster of lower floor and metal throuth hole, described metal throuth hole runs through microstrip line construction successively, medium substrate and grounded metal paster, make to be connected by medium substrate between microstrip line construction with grounded metal paster, described microstrip line construction comprises main transmission line, first resonator, second resonator, 3rd resonator and the 4th resonator, described main transmission line bending fold becomes the right and left symmetrical, middle part is to recessed structure, described first resonator and the second resonator are after bending fold, be separately positioned on lower left and the lower right of main transmission line, and by main transmission line coupling formation one group of resonator, described 3rd resonator and the 4th resonator, after bending fold, are arranged on on recessed position in the middle part of main transmission line, and form another group resonator by main transmission line coupling, two groups of resonators and main transmission line make microstrip line construction entirety in " recessed " font structure, the short-circuit end of each resonator is loaded with a variable capacitance diode.
As a kind of preferred version, the left end of described main transmission line is provided with input port, and right-hand member is provided with output port; Described first resonator, the 3rd resonator and input port are symmetrical with the second resonator, the 4th resonator and output port respectively.
As a kind of preferred version, described first resonator is all connected the first direct voltage source with the second resonator, described 3rd resonator is all connected the second direct voltage source with the 4th resonator, the variable capacitance diode that described first direct voltage source is used for for the first resonator and the second resonator load provides reverse bias voltage, and the variable capacitance diode that described second direct voltage source is used for for the 3rd resonator and the 4th resonator load provides reverse bias voltage.
As a kind of preferred version, between described first resonator and the first direct voltage source, between the second resonator and the first direct voltage source, between the 3rd resonator and the second direct voltage source, between the 4th resonator and the second direct voltage source, be all serially connected with a high frequency choke coil.
As a kind of preferred version, the inductance value of described high frequency choke coil is 100nH.
As a kind of preferred version, the variable capacitance diode that described first resonator loads is the first variable capacitance diode, the variable capacitance diode that described second resonator loads is the second variable capacitance diode, the variable capacitance diode that described 3rd resonator loads is the 3rd variable capacitance diode, and the variable capacitance diode that described 4th resonator loads is the 4th variable capacitance diode; Described metal throuth hole has four, is respectively the first metal throuth hole, the second metal throuth hole, the 3rd metal throuth hole and the 4th metal throuth hole, described first metal throuth hole and the second metal throuth hole symmetrical, described 3rd metal throuth hole and the 4th metal throuth hole symmetrical; Described first metal throuth hole is connected with the first resonator by the first variable capacitance diode, described second metal throuth hole is connected with the second resonator by the second variable capacitance diode, described 3rd metal throuth hole is connected with the 3rd resonator by the 3rd variable capacitance diode, and described 4th metal throuth hole is connected with the 4th resonator by the 4th variable capacitance diode.
As a kind of preferred version, described first variable capacitance diode, the second variable capacitance diode, the 3rd variable capacitance diode and the 4th variable capacitance diode all adopt SMV1413 type variable capacitance diode, its reverse bias voltage is from 0 ~ 30V continuously adjustabe, and capacitance is non-linear between 9.24 ~ 1.77pF to successively decrease.
As a kind of preferred version, described first resonator, the second resonator, the 3rd resonator and the 4th resonator all adopt 1/4 wavelength short-circuit resonant device.
As a kind of preferred version, described 3rd resonator and the 4th resonator all form open ring structure after bending fold.
As a kind of preferred version, two groups of spacing between resonator with main transmission line are all identical.
The utility model has following beneficial effect relative to prior art:
1, restructural two-band band stop filter of the present utility model loads variable capacitance diode (Varactor) resonator by single-ended (short-circuit end) of two groups of independent couplings and realizes two reconfigurable stopbands of independence, make design more flexible and miniaturized, Electro Magnetic Compatibility is better.
2, restructural two-band band stop filter of the present utility model loads variable capacitance diode resonator by single-ended (short-circuit end) of two groups of independent couplings and realizes two second order stopbands, and two patterns are shown in whole frequency-tuning range, improve the rectangular degree of stopband, selectivity is better.
3, restructural two-band band stop filter of the present utility model adopts two groups of independent magnetic-coupled resonators to realize two stopbands, variable capacitance diode controls the constant absolute bandwidth that coupling strength realizes stopband in frequency tuning range, make two stopband absolute bandwidths keep relative constancy, the outer transmission of band is functional.
4, restructural two-band band stop filter of the present utility model is by carrying out suitable bending fold to two groups of resonators and main transmission line, make filter construction compacter, reduce the volume of filter, improve integrated level, and main transmission line can from feed between two groups of resonators, two stopbands are kept apart, realizes independent tuning.
Accompanying drawing explanation
Fig. 1 is the restructural two-band band stop filter structure schematic diagram of the utility model embodiment 1.
Fig. 2 is the resonator equivalent circuit diagram of the employing parallel coupled line feed of the utility model embodiment 1.
Fig. 3 is that the restructural two-band band stop filter of the utility model embodiment 2 emulates and test result correlation curve figure in the S parameter of different first direct voltage source.
Fig. 4 is that the restructural two-band band stop filter of the utility model embodiment 2 emulates and test result correlation curve figure in the S parameter of different second direct voltage source.
Wherein, 1-microstrip line construction, 2-medium substrate, 3-main transmission line, 4-first resonator, 5-second resonator, 6-the 3rd resonator, 7-the 4th resonator, 8-first variable capacitance diode, 9-second variable capacitance diode, 10-the 3rd variable capacitance diode, 11-the 4th variable capacitance diode, 12-first metal throuth hole, 13-second metal throuth hole, 14-the 3rd metal throuth hole, 15-the 4th metal throuth hole, Bias1-first direct voltage source, Bias2-second direct voltage source, L
choke-high frequency choke coil, Port1-input port, Port2-output port.
Embodiment
Embodiment 1:
As shown in Figure 1, the restructural two-band band stop filter of the present embodiment comprises microstrip line construction 1 and active circuit, the medium substrate 2 in middle level, the grounded metal paster (not shown) of lower floor and the metal throuth hole on upper strata, described metal throuth hole runs through microstrip line construction 1, medium substrate 2 and grounded metal paster successively, makes to be connected by medium substrate 2 between microstrip line construction 1 with grounded metal paster; Described microstrip line construction 1 comprises main transmission line 3, first resonator 4, second resonator 5, the 3rd resonator 6 and the 4th resonator 7, described main transmission line 3 bending fold becomes the right and left symmetry, middle part to recessed structure, described first resonator 4 and the second resonator 5 are after bending fold, be separately positioned on lower left and the lower right of main transmission line 3, and be coupled formation one group of resonator by main transmission line 3; Described 3rd resonator 6 and the 4th resonator 7 all form open ring structure after bending fold, are arranged on on recessed position in the middle part of main transmission line 3, and form another group resonator by main transmission line 3; Two groups of resonators and main transmission line 3 make microstrip line construction 1 entirety in " recessed " font structure; By carrying out suitable bending fold to two groups of resonators and main transmission line 3, making filter construction compacter, reducing the volume (namely decreasing the overall dimensions of filter) of filter, improve integrated level.
The short-circuit end of described first resonator 4 is loaded with the first variable capacitance diode 8, the short-circuit end of described second resonator 5 is loaded with the second variable capacitance diode 9, the short-circuit end of described 3rd resonator 6 is loaded with the 3rd variable capacitance diode 10, the short-circuit end of described 4th resonator 7 is loaded with the 4th variable capacitance diode 11, described first variable capacitance diode 8, second variable capacitance diode 9, 3rd variable capacitance diode 10 and the 4th variable capacitance diode 11 all adopt SMV1413 type variable capacitance diode, its reverse bias voltage is from 0 ~ 30V continuously adjustabe, capacitance is non-linear between 9.24 ~ 1.77pF to successively decrease.
Described metal throuth hole has four, be respectively the first metal throuth hole 12, second metal throuth hole 13, the 3rd metal throuth hole 14 and the 4th metal throuth hole 15, described first metal throuth hole 12 and the second metal throuth hole 13 symmetrical, described 3rd metal throuth hole 14 and the 4th metal throuth hole 15 symmetrical; Described first metal throuth hole 12 is connected with the first resonator 4 by the first variable capacitance diode 8, described second metal throuth hole 13 is connected with the second resonator 5 by the second variable capacitance diode 9, described 3rd metal throuth hole 14 is connected with the 3rd resonator 6 by the 3rd variable capacitance diode 10, and described 4th metal throuth hole 15 is connected with the 4th resonator 7 by the 4th variable capacitance diode 11.
Described first resonator 4 is all connected the first direct voltage source Bias1 with the second resonator 5, described 3rd resonator 6 is all connected the second direct voltage source Bias2 with the 4th resonator 7, described first direct voltage source Bias1 provides reverse bias voltage for the variable capacitance diode (first variable capacitance diode 8 and the second variable capacitance diode 9) loaded for the first resonator 4 and the second resonator 5, described second direct voltage source Bias2 provides reverse bias voltage for the variable capacitance diode (the 3rd variable capacitance diode 10 and the 4th variable capacitance diode 11) loaded for the 3rd resonator 6 and the 4th resonator 7, between described first resonator 4 and the first direct voltage source Bias1, between the second resonator 5 and the first direct voltage source Bias1, between the 3rd resonator 6 and the second direct voltage source Bias2, between the 4th resonator 7 and the second direct voltage source Bias2, be all serially connected with a high frequency choke coil L
choke, this high frequency choke coil L
chokethe high Q value inductance of to be inductance value be 100nH, can prevent radiofrequency signal to be shorted to the ground of DC power supply.
The left end of described main transmission line 3 is provided with input port Port1, and right-hand member is provided with output port Port2; Described first resonator 4, the 3rd resonator 6 and input port Port1 are symmetrical with the second resonator 5, the 4th resonator 7 and output port Port2 respectively, and main transmission line 3 is from feed between two groups of resonators; Two groups of resonators are all identical with the spacing between main transmission line 3.
Described first resonator 4 and the second resonator 5 produce low-frequency range first stopband, the electrical length θ of the first resonator 4 and the second resonator 5
1roughly elect the first stopband center frequency f as
01under quarter-wave (λ), with by parallel coupled line feed between input port Port1, output port Port2; Described 3rd resonator 6 and the 4th resonator 7 produce high band second stopband, the electrical length θ of the 3rd resonator 6 and the 4th resonator 7
2roughly elect frequency f as
02under quarter-wave (λ), and same by parallel coupled line feed between input port Port1, output port Port2; All parallel coupled lines all have identical spacing; Because main transmission line 3 is between two groups of resonators, therefore the first stopband and the second stopband can be considered as there is not coupling, can carry out independent tuning respectively by the first direct voltage source Bias1 and the second direct voltage source Bias2 to the centre frequency of the first stopband and the second stopband.
The theoretical condition realizing constant absolute bandwidth is:
Q
e∝f
0，k
i，j∝1/f
0(1)
Wherein, Q
eexternal sort factor, k
i, jcoupling coefficient, f
0for stopband center frequency; For band stop filter, k
i, jrefer to the stiffness of coupling between resonator and main transmission line; As shown in Figure 2, can learn that the principal element of influence zone resistance filter bandwidht is exactly the value (J of J converter (admittance invertors) from equivalent electric circuit
01), the coupling regime between the short-circuit end of resonator and main transmission line is effective coupling length, and magnetic coupling is dominant, the variable capacitance diode (C of loading
v) one section of microstrip line can be equivalent to; When the capacitance of variable capacitance diode diminishes, stop-band frequency raises, and the magnetic coupling length of equivalence diminishes, and total stiffness of coupling diminishes.This satisfies described in (1): stiffness of coupling and centre frequency are inversely proportional to, achieve constant absolute bandwidth.
Known by analyzing above, the utility model is by the single-ended loading variable capacitance diode quarter-wave short-circuit resonant device of the independent coupling of enforcement two groups, achieve two stopband center frequency independence restructurals, and absolute bandwidth keeps relative constancy, the outer transmission of band is functional.The principle of the double frequency independence reconfigurable design of its constant absolute bandwidth that what the utility model comprised is, microstrip line construction being replaced to coaxial line or other analog structures, is all feasible.
Embodiment 2:
The present embodiment will design a constant absolute bandwidth restructural two-band band stop filter, on the basis of Fig. 1 structure, regulates suitable coupling coefficient k according to formula (1)
i, jrealize the requirement of constant absolute bandwidth, regulate the capacitance of variable capacitance diode to change stop-band frequency and equivalent magnetic stiffness of coupling, make total stiffness of coupling variation tendency meet theoretical condition.The circuit of the present embodiment and electromagnetic simulation software are Agilent Advanced Design System (ADS).Constant absolute bandwidth restructural two-band band stop filter Choice and process dielectric constant 2.55, thickness be 0.8mm, loss tangent is on the medium substrate of 0.0029, concrete physical size is as shown in table 1 below.
Table 1 restructural two-band band stop filter size
The present embodiment is measured by Agilent 5230 network analyzer, and (in figure, dotted line represents simulation result, and solid line represents measurement result, S as shown in Figure 3 and Figure 4 for emulation and test result contrast
21the forward transmission coefficient Transmission of input port to output port, S
11the return loss Return Loss of input port), measure two mid-band frequency adjustable extents and be respectively 1.27-1.57GHz and 1.98-2.34GHz, relative adjustable extent is 23.6% and 18.1%.In frequency tuning process, bandwidth of rejection remains unchanged substantially; First stopband 3-dB absolute bandwidth is 40 ± 3MHz, and the second stopband 3-dB absolute bandwidth is 67 ± 3MHz; Isolation between two stopbands is good, and transmission Insertion Loss is at below 0.4dB; First stopband actual attenuation is between 10.2dB is to 13.9, and the second stopband actual attenuation is between 11.1 to 14.3dB; From Fig. 3 and Fig. 4, emulation and measurement result degree of agreement higher, due to the existence of manufacturing tolerance and active loss larger, therefore there is a little error in bandwidth.
In sum, the restructural two-band band stop filter of the absolute bandwidth relative constancy that the utility model proposes, the part having filled up current reconfigurable filter technical research is blank, improve integrated level and the Electro Magnetic Compatibility of system, two stopband independence restructurals and absolute bandwidth maintain substantially constant, can meet the application of existing double frequency wireless communication system better.
The above; be only the utility model patent preferred embodiment; but the protection range of the utility model patent is not limited thereto; anyly be familiar with those skilled in the art in the scope disclosed in the utility model patent; be equal to according to the technical scheme of the utility model patent and utility model design thereof and replaced or change, all belonged to the protection range of the utility model patent.
Claims (10)
1. a restructural two-band band stop filter, comprise microstrip line construction and the active circuit on upper strata, the medium substrate in middle level, the grounded metal paster of lower floor and metal throuth hole, described metal throuth hole runs through microstrip line construction successively, medium substrate and grounded metal paster, make to be connected by medium substrate between microstrip line construction with grounded metal paster, it is characterized in that: described microstrip line construction comprises main transmission line, first resonator, second resonator, 3rd resonator and the 4th resonator, described main transmission line bending fold becomes the right and left symmetrical, middle part is to recessed structure, described first resonator and the second resonator are after bending fold, be separately positioned on lower left and the lower right of main transmission line, and by main transmission line coupling formation one group of resonator, described 3rd resonator and the 4th resonator, after bending fold, are arranged on on recessed position in the middle part of main transmission line, and form another group resonator by main transmission line coupling, two groups of resonators and main transmission line make microstrip line construction entirety in " recessed " font structure, the short-circuit end of each resonator is loaded with a variable capacitance diode.
2. a kind of restructural two-band band stop filter according to claim 1, is characterized in that: the left end of described main transmission line is provided with input port, and right-hand member is provided with output port; Described first resonator, the 3rd resonator and input port are symmetrical with the second resonator, the 4th resonator and output port respectively.
3. a kind of restructural two-band band stop filter according to claim 1, it is characterized in that: described first resonator is all connected the first direct voltage source with the second resonator, described 3rd resonator is all connected the second direct voltage source with the 4th resonator, the variable capacitance diode that described first direct voltage source is used for for the first resonator and the second resonator load provides reverse bias voltage, and the variable capacitance diode that described second direct voltage source is used for for the 3rd resonator and the 4th resonator load provides reverse bias voltage.
4. a kind of restructural two-band band stop filter according to claim 3, is characterized in that: be all serially connected with a high frequency choke coil between described first resonator and the first direct voltage source, between the second resonator and the first direct voltage source, between the 3rd resonator and the second direct voltage source, between the 4th resonator and the second direct voltage source.
5. a kind of restructural two-band band stop filter according to claim 4, is characterized in that: the inductance value of described high frequency choke coil is 100nH.
6. a kind of restructural two-band band stop filter according to claim 1, it is characterized in that: the variable capacitance diode that described first resonator loads is the first variable capacitance diode, the variable capacitance diode that described second resonator loads is the second variable capacitance diode, the variable capacitance diode that described 3rd resonator loads is the 3rd variable capacitance diode, and the variable capacitance diode that described 4th resonator loads is the 4th variable capacitance diode; Described metal throuth hole has four, is respectively the first metal throuth hole, the second metal throuth hole, the 3rd metal throuth hole and the 4th metal throuth hole, described first metal throuth hole and the second metal throuth hole symmetrical, described 3rd metal throuth hole and the 4th metal throuth hole symmetrical; Described first metal throuth hole is connected with the first resonator by the first variable capacitance diode, described second metal throuth hole is connected with the second resonator by the second variable capacitance diode, described 3rd metal throuth hole is connected with the 3rd resonator by the 3rd variable capacitance diode, and described 4th metal throuth hole is connected with the 4th resonator by the 4th variable capacitance diode.
7. a kind of restructural two-band band stop filter according to claim 6, it is characterized in that: described first variable capacitance diode, the second variable capacitance diode, the 3rd variable capacitance diode and the 4th variable capacitance diode all adopt SMV1413 type variable capacitance diode, its reverse bias voltage is from 0 ~ 30V continuously adjustabe, and capacitance is non-linear between 9.24 ~ 1.77pF to successively decrease.
8. a kind of restructural two-band band stop filter according to any one of claim 1-7, is characterized in that: described first resonator, the second resonator, the 3rd resonator and the 4th resonator all adopt 1/4 wavelength short-circuit resonant device.
9. a kind of restructural two-band band stop filter according to any one of claim 1-7, is characterized in that: described 3rd resonator and the 4th resonator all form open ring structure after bending fold.
10. a kind of restructural two-band band stop filter according to any one of claim 1-7, is characterized in that: two groups of spacing between resonator with main transmission line are all identical.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104821420A (en) * | 2015-04-24 | 2015-08-05 | 华南理工大学 | Reconfigurable dual-band band-stop filter |
| CN105932378A (en) * | 2016-06-13 | 2016-09-07 | 华南理工大学 | Planar adjustable bandpass-bandstop filter with controllable bandwidth |
-
2015
- 2015-04-24 CN CN201520256528.5U patent/CN204596927U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104821420A (en) * | 2015-04-24 | 2015-08-05 | 华南理工大学 | Reconfigurable dual-band band-stop filter |
| CN104821420B (en) * | 2015-04-24 | 2017-10-20 | 华南理工大学 | A kind of restructural two-band bandstop filter |
| CN105932378A (en) * | 2016-06-13 | 2016-09-07 | 华南理工大学 | Planar adjustable bandpass-bandstop filter with controllable bandwidth |
| CN105932378B (en) * | 2016-06-13 | 2018-11-02 | 华南理工大学 | A kind of plane that bandwidth is controllable tunable band-pass-bandstop filter |
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