CN204441429U - A kind of frequency and all reconfigurable broadband band-pass filter of bandwidth - Google Patents
A kind of frequency and all reconfigurable broadband band-pass filter of bandwidth Download PDFInfo
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- CN204441429U CN204441429U CN201520148349.XU CN201520148349U CN204441429U CN 204441429 U CN204441429 U CN 204441429U CN 201520148349 U CN201520148349 U CN 201520148349U CN 204441429 U CN204441429 U CN 204441429U
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Abstract
The utility model discloses a kind of frequency and all reconfigurable broadband band-pass filter of bandwidth, 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, make to be connected by medium substrate between microstrip line construction with grounded metal paster, microstrip line construction comprises the first port feed line, second port feed line, first resonator and the second resonator, first port feed line and the second port feed line symmetrical, first resonator is arranged on the top of the first port feed line and the second port feed line, second resonator is arranged on the below of the first port feed line and the second port feed line, whole microstrip line construction is in " ten " font structure.Frequency of the present utility model and bandwidth independence restructural, and respectively have a transmission zero in passband both sides, improve rectangular degree and the selectivity of filter, overall performance is good.
Description
Technical field
The utility model relates to a kind of broadband band-pass filter, and especially a kind of frequency and all reconfigurable broadband band-pass filter of bandwidth being applied in wideband frontend system, belongs to technical field of micro communication.
Background technology
Along with the development of Modern wireless communication technology, radio-frequency front-end often needs to merge multiple wireless channel and communication standard, and these wireless channels and communication standard not only centre frequency are different, also has different bandwidth requirements.This just requires a kind of restructural radio-frequency front-end simultaneously with frequency and bandwidth adjustment ability.Traditional tuned filter cannot free adjustment bandwidth, can not adapt to the requirement of modern wireless systems.Just therefore, a kind of filter simultaneously with centre frequency and bandwidth adjustment ability is suggested, and its English fully tunable filter by name, Chinese is translated into full tunable filter.This kind of filter is one of the forward position and trend of electrically tunable filter research, only has a small amount of bibliographical information in the world at present.In addition, be carry out on narrow band filter substantially to the research of reconfigurable filter at present, still there is many blank in the research of multimode, broadband reconfigurable filter, cannot meet the demand of broadband restructural communication system.Multimode, broadband are another important development trend of electrically tunable filter equally.
According to current existing full variable band-pass filter achievement in research, more typically there is the method for designing of following two kinds:
1) Yi-Chyun Chiou in 2011 and Gabriel M.Rebeiz have delivered " A Tunable Three-Pole 1.5-2.2-GHz Bandpass Filter With Bandwidth andTransmission Zero Control " on IEEE Transaction on MTT, conventional combline bandpass filter improvement coupled structure is adopted to realize the restructural of frequency and bandwidth, as shown in Figure 1, Figure 2 shown in a ~ 2b and Fig. 3 a ~ 3c, adjustable extent is between 1.5 ~ 2.2GHz, and absolute bandwidth is 50 ~ 170MHz (relative bandwidth 2.2% ~ 11.2%).Article is discussed in detail how to change electrical length adjustment centre frequency by control D1, and control D2 changes and W3, L3 change stiffness of coupling regulates bandwidth, and the design for full tunable filter provides another effective method.
2) Theunis S.Beukman in 2013 and Riana H.Geschke have delivered " A Tune-All Wideband Filter Based on PerturbedRing-Resonators " on IEEE Microw.WirelessCompon.Lett., article adopts introducing perturbation that circulating resonator mode is separated, and control two patterns respectively with varactor, obtain frequency and the entirely adjustable characteristic of bandwidth, can learn that strange mould is independently controlled by series capacitance C1 by even and odd mode analysis theory, even mould is independently controlled by shunt capacitance C2, filter construction as shown in Figure 4, the filter designed has the frequency-tuning range of 9% and the bandwidth adjustment scope of 25.3%.
The prior art delivered relates to frequency reconfigurable filter more, and the reconfigurable achievement in research of bandwidth is relatively less.The radio-frequency front-end of modern wireless communication systems often needs to merge multiple wireless channel and communication standard, these wireless channels and communication standard not only centre frequency are different, also have different bandwidth requirements, this just requires a kind of restructural radio-frequency front-end simultaneously with frequency and bandwidth adjustment ability.The prior art overwhelming majority delivered at present designs based on narrow band filter basis, cannot meet the demand of broadband restructural communication system, for broadband reconfigurable filter, and institute's extracting method and structure and the limited capacity realized.In addition, open-circuit resonant device loads active device, microstrip structure inevitably introduces ground connection via hole when combining with active device, for short-circuit resonant device, design in conjunction with active device is directly simple, but sometimes for realizing better performance and less volume, open-circuit resonant device should be paid the utmost attention to, because itself does not possess earth point, design difficulty is relatively large.
Utility model content
The purpose of this utility model is the defect in order to solve above-mentioned prior art, provide a kind of frequency and all reconfigurable broadband band-pass filter of bandwidth, the frequency of this filter and bandwidth independence restructural, and a transmission zero is respectively had in passband both sides, improve rectangular degree and the selectivity of filter, overall performance is good.
The purpose of this utility model can reach by taking following technical scheme:
A kind of frequency and all reconfigurable broadband band-pass filter of bandwidth, 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 the first port feed line, second port feed line, first resonator and the second resonator, described first port feed line and the second port feed line symmetrical, described first resonator is arranged on the top of the first port feed line and the second port feed line, described second resonator is arranged on the below of the first port feed line and the second port feed line, whole microstrip line construction is in " ten " font structure,
Described first resonator comprises the first transmission line and short circuit minor matters, and described short circuit minor matters are vertically set on the center of the first transmission line, makes the first resonator be inverted T shape structure; The both sides, center of described first transmission line are loaded with the first variable capacitance diode and the second variable capacitance diode respectively, described short circuit minor matters are loaded with the 3rd variable capacitance diode, described first variable capacitance diode and the second variable capacitance diode symmetrical;
Described second resonator comprises the second transmission line and open circuit minor matters, and described open circuit minor matters are vertically set on the center of the second transmission line, make the T-shaped structure of the second resonator; The both sides, center of described second transmission line are loaded with the 4th variable capacitance diode and the 5th variable capacitance diode respectively, described open circuit minor matters are loaded with the 6th variable capacitance diode, described 4th variable capacitance diode and the 5th variable capacitance diode symmetrical.
As a kind of preferred version, described 3rd variable capacitance diode is serially connected with the first capacitance, and described 6th variable capacitance diode is serially connected with the second capacitance.
As a kind of preferred version, described 3rd variable capacitance diode is connected the first direct voltage source with on the circuit between the first capacitance, described 6th variable capacitance diode is connected the second direct voltage source with on the circuit between the second capacitance, and described short circuit minor matters are all connected the 3rd direct voltage source with open circuit minor matters on the position near the first transmission line on the position near the second transmission line.
As a kind of preferred version, described 3rd variable capacitance diode is connected the first direct voltage source with the circuit between the first capacitance by the first high frequency choke coil, described 6th variable capacitance diode is connected the second direct voltage source with the circuit between the second capacitance by the second high frequency choke coil, described short circuit minor matters are by third high choke connection frequently the 3rd direct voltage source on the position near the first transmission line, and described open circuit minor matters connect the 3rd direct voltage source by the 4th high frequency choke coil on the position near the second transmission line.
As a kind of preferred version, described metal throuth hole has six, be respectively the first metal throuth hole, second metal throuth hole, 3rd metal throuth hole, 4th metal throuth hole, 5th metal throuth hole and the 6th metal throuth hole, described first metal throuth hole is arranged on short circuit minor matters one end away from the first transmission line, described second metal throuth hole is arranged on the upper left side of the first resonator, and be connected with the first transmission line by the 5th high frequency choke coil, described 3rd metal throuth hole is arranged on the upper right side of the first resonator, and be connected with the first transmission line by the 6th high frequency choke coil, described 4th metal throuth hole is arranged on the lower left side of the second resonator, and be connected with the second transmission line by the 7th high frequency choke coil, described 5th metal throuth hole is arranged on the lower right side of the second resonator, and be connected with the second transmission line by the 8th high frequency choke coil, described 6th metal throuth hole arranges the side of open circuit minor matters, and be connected with open circuit minor matters by the 9th high frequency choke coil.
As a kind of preferred version, the left end of described first port feed line is as input port, and the right-hand member of described second port feed line is as output port.
As a kind of preferred version, described first port feed line and the spacing between the first resonator, spacing, the spacing between the first port feed line and the second resonator and the spacing between the second port feed line and the second resonator between the second port feed line and the first resonator are all identical.
As a kind of preferred version, described medium substrate employing dielectric constant is 2.55, thickness is 0.8mm, loss tangent is the medium substrate of 0.0029.
The utility model has following beneficial effect relative to prior art:
1, broadband band-pass filter of the present utility model is by two T-shaped resonators of center loaded short/open minor matters in parallel, to each pattern independent tuning, achieve the independent restructural of frequency and bandwidth, can meet the wireless communication system demand of different frequency and bandwidth demand, Electro Magnetic Compatibility is better.
2, broadband band-pass filter of the present utility model produces a strange mould and two even moulds by two T-shaped resonators, constitute three Mould Breadth band reconfigurable filter, its centre frequency and absolute bandwidth Independent adjustable, meet the demand of practical application middle width strip wireless communication system, overcome the problem that traditional reconfigurable filter bandwidht is narrower.
3, broadband band-pass filter of the present utility model adopts two T-shaped resonators of center loaded short/open minor matters in parallel, by loading variable capacitance diode (Varactor) respectively on transmission line and short/open minor matters, realize the independence of strange mould, even mould controlled; For open-circuit structure, introduce extra ground connection via hole by high frequency choke coil (choke), successfully active device and open-circuit structure are merged, realize the electric restructural of open-circuit resonator; Compared with being with the overwhelming majority prior art that designs based on short-circuit resonant device, solve the problem based on open-circuit structure design reconfigurable microwave device.
Accompanying drawing explanation
Fig. 1 is the full variable band-pass filter structural representation of one of prior art.
Fig. 2 a is the S of filter shown in Fig. 1
21parameters simulation curve chart.
Fig. 2 b is the S of filter shown in Fig. 1
11parameters simulation curve chart.
Fig. 3 a ~ 3c is the S of filter shown in Fig. 1 under different direct voltage source
21parameters simulation curve chart.
Fig. 4 is the full variable band-pass filter structural representation of another kind of prior art.
Fig. 5 is the broadband band-pass filter structural representation of the utility model embodiment 1.
Fig. 6 is the strange mould equivalent circuit diagram of broadband band-pass filter of the utility model embodiment 1.
Fig. 7 is the even mould equivalent circuit diagram of broadband band-pass filter of the utility model embodiment 1.
Fig. 8 is the mode profile simulation curve figure under the broadband band-pass filter weak coupling excitation of the utility model embodiment 1.
Fig. 9 is that the broadband band-pass filter of the utility model embodiment 1 emulates and test result correlation curve figure in the S parameter of different first direct voltage source.
Figure 10 is that the broadband band-pass filter of the utility model embodiment 1 emulates and test result correlation curve figure in the S parameter of different second direct voltage source.
Figure 11 is that the broadband band-pass filter of the utility model embodiment 1 emulates and test result correlation curve figure in the S parameter of different 3rd direct voltage source.
Wherein, 1-microstrip line construction, 2-medium substrate, 3-first port feed line, 4-second port feed line, 5-first transmission line, 6-short circuit minor matters, 7-first variable capacitance diode, 8-second variable capacitance diode, 9-the 3rd variable capacitance diode, 10-second transmission line, 11-opens a way minor matters, 12-the 4th variable capacitance diode, 13-the 5th variable capacitance diode, 14-the 6th variable capacitance diode, 15-first capacitance, 16-second capacitance, 17-first high frequency choke coil, 18-second high frequency choke coil, 19-third high is choke frequently, 20-the 4th high frequency choke coil, 21-first metal throuth hole, 22-second metal throuth hole, 23-the 3rd metal throuth hole, 24-the 4th metal throuth hole, 25-the 5th metal throuth hole, 26-the 6th metal throuth hole, 27-the 5th high frequency choke coil, 28-the 6th high frequency choke coil, 29-the 7th high frequency choke coil, 30-the 8th high frequency choke coil, 31-the 9th high frequency choke coil, V1-first direct voltage source, V2-second direct voltage source, V3-the 3rd direct voltage source, Port1-input port, Port2-output port.
Embodiment
Embodiment 1:
As shown in Figure 5, the microstrip line construction 1 on the broadband band-pass filter upper strata of the present embodiment and active circuit, the medium substrate 2 in middle level, the grounded metal paster (not shown) of lower floor and metal throuth hole, described metal throuth hole runs through microstrip line construction 1 successively, medium substrate 2 and grounded metal paster, described microstrip line construction 1 comprises the first port feed line 3, second port feed line 4, first resonator and the second resonator, described first port feed line 3 and the second port feed line 4 symmetrical, the left end of the first port feed line 3 is as input port Port1, the right-hand member of the second port feed line 4 is as output port Port2, described first resonator is arranged on the top of the first port feed line 3 and the second port feed line 4, described second resonator is arranged on the below of the first port feed line 3 and the second port feed line 4, spacing between described first port feed line 3 and the first resonator, spacing between second port feed line 4 and the first resonator, first port feed line 3 is all identical with the spacing between the second resonator and the spacing between the second port feed line 4 and the second resonator, whole microstrip line construction 1 is in " ten " font structure,
Described first resonator comprises the first transmission line 5 and short circuit minor matters 6, and described short circuit minor matters 6 are vertically set on the center of the first transmission line 5, makes the first resonator be inverted T shape structure, forms a short circuit and loads dual-mode resonator; The both sides, center of described first transmission line 5 are loaded with the first variable capacitance diode 7 and the second variable capacitance diode 8 respectively, described short circuit minor matters 6 are loaded with the 3rd variable capacitance diode 9, described first variable capacitance diode 7 and the second variable capacitance diode 8 symmetrical;
Described second resonator comprises the second transmission line 10 and open circuit minor matters 11, and described open circuit minor matters 11 are vertically set on the center of the second transmission line 10, make the T-shaped structure of the second resonator, forms an open circuit and loads dual-mode resonator; The both sides, center of described second transmission line 10 are loaded with the 4th variable capacitance diode 12 and the 5th variable capacitance diode 13 respectively, described open circuit minor matters 11 are loaded with the 6th variable capacitance diode 14, described 4th variable capacitance diode 12 and the 5th variable capacitance diode 13 symmetrical.
Described 3rd variable capacitance diode 9 is serially connected with the first capacitance 15, and described 6th variable capacitance diode 14 is serially connected with the second capacitance 16, described 3rd variable capacitance diode 9 is connected the first direct voltage source V1 with on the circuit between the first capacitance 15, described 6th variable capacitance diode 14 is connected the second direct voltage source V2 with on the circuit between the second capacitance 16, described short circuit minor matters 6 are all connected the 3rd direct voltage source V3 with open circuit minor matters 11 on the position near the first transmission line 5 on the position near the second transmission line 10, wherein said 3rd variable capacitance diode 9 is connected the first direct voltage source V1 with on the circuit between the first capacitance 15 by the first high frequency choke coil 17, described 6th variable capacitance diode 14 is connected the second direct voltage source V2 with on the circuit between the second capacitance 16 by the second high frequency choke coil 18, described short circuit minor matters 6 connect the 3rd direct voltage source V3 by third high frequency choke 19 on the position near the first transmission line 5, described open circuit minor matters 11 connect the 3rd direct voltage source V3 by the 4th high frequency choke coil 20 on the position near the second transmission line 10.
Described metal throuth hole is ground connection via hole in fact namely, have six, be respectively the first metal throuth hole 21, second metal throuth hole 22, 3rd metal throuth hole 23, 4th metal throuth hole 24, 5th metal throuth hole 25 and the 6th metal throuth hole 26, described first metal throuth hole 21 is arranged on short circuit minor matters 6 one end away from the first transmission line 5, described second metal throuth hole 22 is arranged on the upper left side of the first resonator, and be connected with the first transmission line 5 by the 5th high frequency choke coil 27, described 3rd metal throuth hole 23 is arranged on the upper right side of the first resonator, and be connected with the first transmission line 5 by the 6th high frequency choke coil 28, described 4th metal throuth hole 24 is arranged on the lower left side of the second resonator, and be connected with the second transmission line 10 by the 7th high frequency choke coil 29, described 5th metal throuth hole 25 is arranged on the lower right side of the second resonator, and be connected with the second transmission line 10 by the 8th high frequency choke coil 30, described 6th metal throuth hole 26 arranges the side (the present embodiment is on the right of open circuit minor matters 11) of open circuit minor matters 11, and be connected with open circuit minor matters 11 by the 9th high frequency choke coil 31.
Respectively as shown in Figure 6 and Figure 7, the first resonator and the second resonator have two patterns for the strange mould equivalent electric circuit of the broadband band-pass filter of the present embodiment and even mould equivalent electric circuit, and the strange mould Odd-mode of wherein their generations, resonance frequency is f
odd, controlled by the 3rd direct voltage source V3, electrical length is θ
1, be roughly f
oddunder 1/2nd wavelength; The even mould Even-mode1 that first resonator produces, resonance frequency is f
even1, independently controlled by the first direct voltage source V1, electrical length is θ
1+ θ
2, roughly elect frequency f as
even1under 1/2nd wavelength, with by parallel coupling feed between input/output end port; The even mould Even-mode2 that second resonator produces, resonance frequency is f
even2, independently controlled by the second direct voltage source V2, electrical length is θ
1+ θ
3, roughly elect frequency f as
even2under a wavelength, with by parallel coupling feed between input/output end port; Wherein, f
even1< f
odd< f
even2, thus constitute three mould broadband band-pass filters; (S in figure as shown in Figure 8
21represent the forward transmission coefficient of input port to output port), obviously can find out that the first direct voltage source V1 and the second direct voltage source V2 respectively can independent control Even-mode1 and Even-mode2 from the response weak coupling excitation, and both are independent of each other, can independently carry out the reconstruct of control realization bandwidth to the both sides of filter passband; 3rd direct voltage source V3 then can control overall resonance frequency; This structure also respectively creates a transmission zero in the both sides of passband, improves the selectivity of passband well.
From foregoing, the broadband band-pass filter of the present embodiment is based on the mentality of designing of multimode Independent adjustable, two resonators of filter are respectively loaded with three variable capacitance diodes, achieve the restructural of frequency and bandwidth, wherein two variable capacitance diode asymmetrical loads are in center of transmission line both sides, and the 3rd variable capacitance diode loads on short/open minor matters.
Variable capacitance diode loads and often applies to the planar structure such as micro-band short-circuit structure or co-planar waveguide (CPW), very rare open-circuit structure adopts, this is because this kind of active device of variable capacitance diode needs ground connection normally to work, and open-circuit structure itself does not possess earth point; The open-circuit structure of the present embodiment merges the solution of active device: outside the first resonator and the second resonator, increase ground connection via hole (i.e. above-mentioned second ~ six metal throuth hole), visible except the ground connection via hole in the first resonator short circuit minor matters, other ground connection via hole is all to merge active device in open-circuit structure, all adopts a high frequency choke coil with high q-factor to be connected with resonator; For radiofrequency signal, resonator does not change, and remain open-circuit structure, ground connection via hole is inoperative; And for DC source and active device, meet again the condition of normal work, achieve the electric restructural of open-circuit structure.
Known by analyzing above, the utility model passes through enforcement two the T-shaped resonator of center loaded short/open minor matters in parallel, and achieve a passband central frequency and the independent reconfigurable broadband band-pass filter of bandwidth, passband is good with the outer selectivity of band.The principle of the complete adjustable design of its centre frequency and 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:
As shown in Figure 5, by loading variable capacitance diode respectively on the transmission line and minor matters of two T-shaped resonators (the first resonator and the second resonator), independent control is carried out to strange mould, even mould resonance frequency, achieve a frequency and all reconfigurable broadband band-pass filter of bandwidth (also can be described as full adjustable wide-band band pass filter), its centre frequency and absolute bandwidth can carry out independent tuning.The circuit of the present embodiment and electromagnetic simulation software are Agilent Advanced DesignSystem (ADS).The all reconfigurable broadband band-pass filter Choice and process of frequency and bandwidth dielectric constant 2.55, thickness be 0.8mm, loss angle tangent is on the medium substrate of 0.0029, concrete physical size is as shown in table 1 below.
The all reconfigurable broadband band-pass filter size of table 1 frequency and bandwidth
The present embodiment by Agilent 5230 network analyzer measure, emulation and measurement result as Figure 9-Figure 11 (in figure, S
21represent the forward transmission coefficient of input port to output port, S
11represent the return loss of input port, Simulated represents simulation result, and Measured represents measurement result).The passband relative bandwidth measured is 53.7%, and regulable center frequency scope is respectively 2.475 ~ 2.61GHz, and relative adjustable extent is 5.4%.When centre frequency is fixed as 2.475GHz, the adjustable extent of left side band is 1.81 ~ 2.51GHz, and the adjustable extent of the right band is 3.14 ~ 3.31GHz, and the relative adjustable extent of bandwidth is 138%.In frequency and bandwidth tuning process, in passband, Insertion Loss is between-0.75 to-1.1dB, and reflection all remains on below-10dB, and filter match is good, and the transmission zero of passband both sides substantially increases selectivity.Emulation and measurement result very high at the degree of agreement of low frequency, the error of high frequency treatment frequency is mainly caused by the performance of variable capacitance diode itself decays to some extent at more than 3GHz.
In sum, all reconfigurable broadband band-pass filter of the frequency that the utility model proposes and bandwidth, the part having filled up current reconfigurable filter technical research is blank, improves integrated level and the Electro Magnetic Compatibility of system.As a reconfigurable broadband band-pass filter, its centre frequency and absolute bandwidth can independently carry out tuning, meet existing wireless communications systematic difference 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 (8)
1. a frequency and all reconfigurable broadband band-pass filter of bandwidth, 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 the first port feed line, second port feed line, first resonator and the second resonator, described first port feed line and the second port feed line symmetrical, described first resonator is arranged on the top of the first port feed line and the second port feed line, described second resonator is arranged on the below of the first port feed line and the second port feed line, whole microstrip line construction is in " ten " font structure,
Described first resonator comprises the first transmission line and short circuit minor matters, and described short circuit minor matters are vertically set on the center of the first transmission line, makes the first resonator be inverted T shape structure; The both sides, center of described first transmission line are loaded with the first variable capacitance diode and the second variable capacitance diode respectively, described short circuit minor matters are loaded with the 3rd variable capacitance diode, described first variable capacitance diode and the second variable capacitance diode symmetrical;
Described second resonator comprises the second transmission line and open circuit minor matters, and described open circuit minor matters are vertically set on the center of the second transmission line, make the T-shaped structure of the second resonator; The both sides, center of described second transmission line are loaded with the 4th variable capacitance diode and the 5th variable capacitance diode respectively, described open circuit minor matters are loaded with the 6th variable capacitance diode, described 4th variable capacitance diode and the 5th variable capacitance diode symmetrical.
2. a kind of frequency according to claim 1 and all reconfigurable broadband band-pass filter of bandwidth, it is characterized in that: described 3rd variable capacitance diode is serially connected with the first capacitance, described 6th variable capacitance diode is serially connected with the second capacitance.
3. a kind of frequency according to claim 2 and all reconfigurable broadband band-pass filter of bandwidth, it is characterized in that: described 3rd variable capacitance diode is connected the first direct voltage source with on the circuit between the first capacitance, described 6th variable capacitance diode is connected the second direct voltage source with on the circuit between the second capacitance, and described short circuit minor matters are all connected the 3rd direct voltage source with open circuit minor matters on the position near the first transmission line on the position near the second transmission line.
4. a kind of frequency according to claim 3 and all reconfigurable broadband band-pass filter of bandwidth, it is characterized in that: described 3rd variable capacitance diode is connected the first direct voltage source with on the circuit between the first capacitance by the first high frequency choke coil, described 6th variable capacitance diode is connected the second direct voltage source with on the circuit between the second capacitance by the second high frequency choke coil, described short circuit minor matters connect the 3rd direct voltage source by third high frequency choke on the position near the first transmission line, described open circuit minor matters connect the 3rd direct voltage source by the 4th high frequency choke coil on the position near the second transmission line.
5. a kind of frequency according to claim 1 and all reconfigurable broadband band-pass filter of bandwidth, it is characterized in that: described metal throuth hole has six, be respectively the first metal throuth hole, second metal throuth hole, 3rd metal throuth hole, 4th metal throuth hole, 5th metal throuth hole and the 6th metal throuth hole, described first metal throuth hole is arranged on short circuit minor matters one end away from the first transmission line, described second metal throuth hole is arranged on the upper left side of the first resonator, and be connected with the first transmission line by the 5th high frequency choke coil, described 3rd metal throuth hole is arranged on the upper right side of the first resonator, and be connected with the first transmission line by the 6th high frequency choke coil, described 4th metal throuth hole is arranged on the lower left side of the second resonator, and be connected with the second transmission line by the 7th high frequency choke coil, described 5th metal throuth hole is arranged on the lower right side of the second resonator, and be connected with the second transmission line by the 8th high frequency choke coil, described 6th metal throuth hole arranges the side of open circuit minor matters, and be connected with open circuit minor matters by the 9th high frequency choke coil.
6. a kind of frequency according to claim 1 and all reconfigurable broadband band-pass filter of bandwidth, is characterized in that: the left end of described first port feed line is as input port, and the right-hand member of described second port feed line is as output port.
7. a kind of frequency according to claim 1 and all reconfigurable broadband band-pass filter of bandwidth, is characterized in that: described first port feed line and the spacing between the first resonator, spacing, the spacing between the first port feed line and the second resonator and the spacing between the second port feed line and the second resonator between the second port feed line and the first resonator are all identical.
8. a kind of frequency according to any one of claim 1-7 and all reconfigurable broadband band-pass filter of bandwidth, is characterized in that: described medium substrate employing dielectric constant is 2.55, thickness is 0.8mm, loss tangent is the medium substrate of 0.0029.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104733813A (en) * | 2015-03-16 | 2015-06-24 | 华南理工大学 | Broadband bandpass filter with frequency and bandwidth reconfigurable |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104733813A (en) * | 2015-03-16 | 2015-06-24 | 华南理工大学 | Broadband bandpass filter with frequency and bandwidth reconfigurable |
| CN104733813B (en) * | 2015-03-16 | 2017-06-06 | 华南理工大学 | A kind of broadband band-pass filter of frequency and the equal restructural of bandwidth |
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