CN101916892A - Tunable band-stop filter of constant absolute bandwidth based on modular structure - Google Patents
Tunable band-stop filter of constant absolute bandwidth based on modular structure Download PDFInfo
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- CN101916892A CN101916892A CN201010214858XA CN201010214858A CN101916892A CN 101916892 A CN101916892 A CN 101916892A CN 201010214858X A CN201010214858X A CN 201010214858XA CN 201010214858 A CN201010214858 A CN 201010214858A CN 101916892 A CN101916892 A CN 101916892A
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Abstract
The invention discloses a tunable band-stop filter of constant absolute bandwidth based on a modular structure, which comprises a micro-band structure in the upper layer, a medium substrate in the middle layer and a grounded metal plate in the lower layer. The filter can consist of one module unit or a plurality of module units, each of which comprises two resonators and a main transmission line; the two resonators are both half-wavelength resonators which have the same structure, and the two resonators are symmetrical about a central vertical axis in the micro-band structure; the main transmission line comprises a coupling part and a non-coupling part; the coupling part consists of a seventh micro-band line, an eighth micro-band line and a ninth micro-band line, and the lines are sequentially connected to form an n-shaped structure which is arranged at the inside of an n-shaped structure of the coupling part of the resonators; variable capacitance diodes of the two resonators are set with the same bias voltage; and the filter can be applied to various reconfigurable radio frequency front-end circuits and has the characteristics of constant absolute bandwidth when the frequency is tuned. By cascading two or more module units, a tunable band-stop filter of constant absolute bandwidth can be obtained, the frequency selectivity of which is higher.
Description
Technical field
The present invention relates to the adjustable band stop filter of a kind of centre frequency, particularly relate to a kind ofly based on modular construction, absolute bandwidth was constant when centre frequency was tuning, can be applicable to the tunable band-stop filter in the radio-frequency (RF) front-end circuit.
Background technology
The high performance restructural Radio Frequency Subsystem of development need of modern ULTRA-WIDEBAND RADAR and radio communication, for example the demand for development miniaturization of mobile communication, many standards, multi-mode, multi-band transceiver, in order to adapt to this requirement, radio-frequency front-end need be regulated its operating frequency and bandwidth according to mode of operation.This class radio-frequency front-end needs various radio frequency tunable filters to select useful signal and suppress interference signal, and wherein radio frequency electrically adjusted band stop filter is an important class of radio frequency tunable filter.In the radio-frequency (RF) front-end circuit of multiband broadband transceiver and software radio, the band stop filter that centre frequency is adjustable can be used for suppressing to appear near the high reject signal of the more weak useful signal frequency of intensity.
The method for designing of multiple tunable band-stop filter has been arranged at present, several typical methods have wherein been arranged.First method is the frequency of coming tuning stopband by the resonance frequency of regulating the resonator that is coupled with main transmission line, as I.C.Hunter and J.D.Rhodes, " Electronically tunable microwave bandstop filters; " IEEE Trans.Microw.Theory Tech., vol.MTT-30, no.9, pp.1361-1367, Sep.1982.Second method is to adopt the DGS of variable capacitance diode (defective ground) structure integrated to design tunable band-stop filter, as A.M.E.Safwat, F.Podevin, P.Ferrari and A.Vi lcot, " Tunable bandstop defected ground structure resonator using reconfigurable dumbbell-shaped coplanar waveguide, " IEEE Trans.Microw.Theory Tech., vol.54, no.9, pp.3559-3564, Sep.2006.The third method is that the impedance of regulating resonator in the stop-band frequency scope makes it to be complementary with source/load impedance, thereby signal energy in being arranged, the consumption oscillator is absorbed, as D.R.Jachowski, " Cascadable lossy passive biquad bandstop filter; " in IEEE MTT-S Int Microwave Symp.Dig., pp.513-516,2005.
No matter adopt which kind of filter design method, electricity transfers the band stop filter design all to be faced with two problems: the one, and the absolute bandwidth of stopband can change during the stopband center frequency tuning; The 2nd, the design problem of high-order electrically tunable filter must be adjusted the design parameter of each grade and can not be directly the band stop filter of two low orders be cascaded up in design high-order electrically tunable filter, cause the design complexity.
Summary of the invention
The objective of the invention is to the problem that exists at prior art, provide a kind of based on modular construction, the constant tunable band-stop filter of absolute bandwidth when centre frequency is tuning; Has absolute bandwidth constant characteristic based on the constant tunable band-stop filter of the absolute bandwidth of modular construction; Have the modularized design characteristic simultaneously, directly two or more tunable band-stop filter modular units of cascade can obtain the higher band stop filter of frequency selectivity; Based on the constant tunable band-stop filter of the absolute bandwidth of modular construction, can solve the directly problem of cascade of centre frequency problem that the absolute bandwidth of stopband changes when tuning and higher order filter design.
For realizing the object of the invention, the technical solution adopted in the present invention is as follows:
Based on the constant tunable band-stop filter of the absolute bandwidth of modular construction, comprise the microstrip structure on upper strata, the medium substrate in intermediate layer and the grounding plate of lower floor; The upper strata microstrip structure is attached to intermediate layer dielectric-slab upper surface, and intermediate layer dielectric-slab lower surface is a grounded metal; The microstrip structure on upper strata comprises two resonators and main transmission line; Two resonators all are half-wave resonator, and structure is identical, are symmetrical arranged about the center longitudinal axis of microstrip structure; Each resonator is made of microstrip line and variable capacitance diode; The variable capacitance diode of two resonators is provided with identical bias voltage; The microstrip line of resonator is divided into coupling unit and non-coupling unit; The microstrip line coupling unit of resonator is by the 3rd microstrip line, and the 4th microstrip line and the 5th microstrip line are in turn connected into n shape structure; The non-coupling unit of the microstrip line of resonator comprises first microstrip line, second microstrip line and the 6th microstrip line; The one end open circuit of first microstrip line, the other end links to each other with second microstrip line; The other end of second microstrip line is connected with the 3rd microstrip line; The 6th microstrip line one end is connected with the 5th microstrip line, and the other end links to each other with variable capacitance diode; The metallization via hole of the other end of variable capacitance diode through passing the intermediate layer medium substrate links to each other with the lower floor grounded metal; Described main transmission line comprises coupling unit and non-coupling unit; Its coupling unit is by the 7th microstrip line, and the 8th microstrip line and the 9th microstrip line connect and compose n shape structure successively, is positioned at the inboard of resonator coupling unit n shape structure; Being provided with width between resonator coupling unit and the main transmission line coupling unit is the electromagnetic coupled spacing of 0.1mm-0.8mm; The non-coupling unit of main transmission line comprises the port microstrip line and is connected microstrip line; The connection microstrip line is a serpentine; Connect the microstrip line bilateral symmetry port microstrip line, the 7th microstrip line, the 8th microstrip line, the 9th microstrip line are set; Port microstrip line one end is connected with the 7th microstrip line; Connecting microstrip line is connected with the 9th microstrip line; The length of described connection microstrip line
Wherein c is the light velocity, ε
rBe the relative dielectric constant of medium substrate,
f
MinAnd f
MaxBe respectively the minimum value and the maximum of the resonance frequency f adjustable extent of resonator; The electrical length L+ Δ L of resonator be resonance frequency f correspondence wavelength X 1/2nd; Wherein, L is actual microstrip line length, and Δ L is a variable capacitance diode equivalence microstrip line length; Actual microstrip line length L is the length sum of first microstrip line, second microstrip line, the 3rd microstrip line, the 4th microstrip line, the 5th microstrip line and the 6th microstrip line; Resonator is coupled modes that a kind of electric coupling mixes with magnetic coupling with coupled modes between the main transmission line, and the length between the coupled zone equals the 3rd microstrip line, the length summation of the 4th microstrip line and the 5th microstrip line; At the highest resonance frequency f
MaxWith lowest resonant frequency f
MinIn the mid point of the equivalent microstrip line that last resonator is total drops between the coupled zone; In between this coupled zone in the electromagnetic coupled magnetic coupling occupy an leading position, stiffness of coupling reduces along with the increase of frequency.
For further realizing the object of the invention, the turnable resonator frequency range of described tunable band-stop filter is 1.73-2.2GHz, wherein, the length of first microstrip line and the 3rd microstrip line is 5.6mm, the length of second microstrip line is 1.88mm, the length of the 4th microstrip line is 3.75mm, the length of the 5th microstrip line is 9.8mm, spacing between the 7th microstrip line and the 9th microstrip line is 2mm, the length of the 6th microstrip line is 1.7mm, coupling spacing between resonator and the main transmission line is 0.12mm, the width of the 6th microstrip line is 0.7mm, the width that connects microstrip line is 0.3mm, the width of first microstrip line and second microstrip line is 0.7mm, the 3rd microstrip line, the width of the 4th microstrip line and the 5th microstrip line is 0.4mm, the 7th microstrip line, the width of the 8th microstrip line and the 9th microstrip line is 0.8mm, the width of port microstrip line is 1.9mm, and the characteristic impedance of port microstrip line is 50 Ω.The length L that connects microstrip line
12Be 25.4mm.
Two identical tunable band-stop filter modular units connect the tunable band-stop filter that obtains two-stage by 50 Ω transmission lines, and the length of transmission line is greater than 1.5 times of dielectric substrate thickness.
With respect to prior art, the present invention has following advantage:
(1) absolute bandwidth is constant.For common tunable band-stop filter, its absolute bandwidth can change when the centre frequency of stopband is tuning, and the centre frequency of the band stop filter in the embodiment of the present invention absolute bandwidth when tuning keeps constant, is better than common tunable band-stop filter.
(2) modular construction.The a plurality of modular units of cascade form higher order filter and improve frequency selectivity easily.Must adjust the design parameter of each grade when designing the high-order electrically tunable filter and can not directly two common low order band stop filters be cascaded up, cause design complicated with common band stop filter structure.Modular unit among the present invention is the modularization symmetrical structure, the impedance of seeing into from two-port is identical, when 50 Ω are all adjusted in the impedance of two-port, just can be directly two modular units realization higher order filter that cascades up, thereby improve its frequency selectivity.
Description of drawings
Fig. 1 is based on the structure chart of a modular unit of the constant tunable band-stop filter of the absolute bandwidth of modular construction;
Fig. 2 (a) is the equivalent schematic diagram of the electromagnetic coupled structure of tunable band-stop filter;
Fig. 2 (b) is the equivalent circuit diagram of resonator under different bias voltages of tunable band-stop filter;
Fig. 3 is the structural representation that adopts the tunable band-stop filter of a modular unit;
Fig. 4 is the transfer curve figure that adopts the tunable band-stop filter of a modular unit;
Fig. 5 is the structural representation that adopts the tunable band-stop filter of two modular units;
Fig. 6 is the transfer curve figure that adopts the tunable band-stop filter of two modular units.
Specific embodiments
The present invention is further detailed explanation below in conjunction with accompanying drawing, but the scope of protection of present invention is not limited to down the scope of example statement.
As shown in Figure 1, comprise the microstrip structure on upper strata, the medium substrate in intermediate layer and the grounding plate of lower floor based on the constant tunable band-stop filter of the absolute bandwidth of modular construction; The upper strata microstrip structure is attached to intermediate layer dielectric-slab upper surface, and intermediate layer dielectric-slab lower surface is a grounded metal; The microstrip structure on upper strata comprises two resonators and main transmission line; Two resonators all are half-wave resonator, and structure is identical, are symmetrical arranged about the center longitudinal axis of microstrip structure; Each resonator is made of microstrip line and variable capacitance diode 7; The microstrip line of resonator is divided into coupling unit and non-coupling unit; The microstrip line coupling unit of resonator is in turn connected into n shape structure by the 3rd microstrip line 3, the four microstrip lines 4 and the 5th microstrip line 5; The non-coupling unit of the microstrip line of resonator comprises first microstrip line, 1, the second microstrip line 2 and the 6th microstrip line 6; The one end open circuit of first microstrip line 1, the other end links to each other with second microstrip line 2; The other end of second microstrip line 2 is connected with the 3rd microstrip line 3; The 6th microstrip line 6 one ends are connected with the 5th microstrip line 5, and the other end links to each other with variable capacitance diode pipe 7; The other end of variable capacitance diode 7 links to each other with the grounding plate of lower floor by the metallization via hole of medium substrate.Main transmission line is symmetrical arranged about the center longitudinal axis of microstrip structure, comprises coupling unit and non-coupling unit; Coupling unit connects and composes n shape structure successively by the 7th microstrip line 9, the eight microstrip lines 10 and the 9th microstrip line 11, is positioned at the inboard of resonator coupling unit n shape structure.The non-coupling unit of main transmission line comprises port microstrip line 8 and is connected microstrip line 12; Connecting microstrip line 12 is serpentine; Connect microstrip line 12 bilateral symmetry port microstrip line 8, the 7th microstrip line 9, the 8th microstrip line 10, the 9th microstrip line 11 are set; Port microstrip line 8 one ends are connected with the 7th microstrip line 9; Connecting microstrip line 12 is connected with the 9th microstrip line 11; Port microstrip line 8 is parallel with second microstrip line 2, and distance prevents electromagnetic coupled greater than 1.5 times of dielectric substrate thickness to each other; The characteristic impedance of port microstrip line 8 is 50 Ω; Being provided with width between resonator coupling unit and the main transmission line coupling unit is the electromagnetic coupled spacing of 0.1mm-0.8mm, realizes electromagnetic coupled; The electromagnetic coupled spacing is decided by the coupling power.The connection microstrip line 12 of main transmission line plays the effect of impedance conversion, connects the length of microstrip line 12
Wherein c is the light velocity, ε
rBe the relative dielectric constant of medium substrate,
f
MinAnd f
MaxBe respectively the minimum value and the maximum of the resonance frequency f adjustable extent of resonator.
Resonator is made up of microstrip line and variable capacitance diode, and microstrip line one end connects a variable capacitance diode, other end open circuit; First microstrip line 1, the second microstrip line, 2, the three microstrip line 3, the four microstrip lines, 4, the five microstrip lines 5 of resonator and the 6th microstrip line 6 length and the total length that adds the microstrip line of variable capacitance diode 7 equivalences are the half-wavelength on the filter resonance frequency.The resonance frequency of resonator is mainly regulated by the bias voltage of variable capacitance diode.When ignoring ghost effect, variable capacitance diode can equivalence becomes the microstrip line of section termination open circuit.Shown in Fig. 2 (a), hatched example areas is represented real microstrip line, and length is L; The microstrip line that the variable capacitance diode equivalence becomes is represented in the net region, and length is Δ L; The electrical length L+ Δ L of resonator be resonance frequency f correspondence wavelength X 1/2nd; Resonance frequency f and electrical length are inversely proportional to, promptly
Adjust the bias voltage of the variable capacitance diode 7 of resonator, then the equivalent capacity of variable capacitance diode 7 can change, and its equivalent microstrip line length also can change thereupon, thereby resonance frequency changes; Shown in Fig. 2 (b), as the equivalent capacity C of variable capacitance diode
V1＞C
V2The time, corresponding equivalent microstrip line length Δ L
1＞Δ L
2, corresponding resonance frequency f
1＜f
2Therefore by adjusting the bias voltage of variable capacitance diode, can adjust the centre frequency of stop-band filter.The resonance frequency tuning range f of selected variable capacitance diode 7 and definite filter work
Min, f
MaxAfterwards, can determine the excursion of the equivalent microstrip line length of variable capacitance diode, be the length L that the characteristic of half-wavelength just can be determined actual microstrip line according to the total length of equivalent microstrip line then.Actual microstrip line length L is the length sum of first microstrip line 1, second microstrip line 2, the 3rd microstrip line 3, the 4th microstrip line 4, the 5th microstrip line 5 and the 6th microstrip line 6 among Fig. 1.
Based on the resonator of the constant tunable band-stop filter of the absolute bandwidth of modular construction and the coupled modes of main transmission line employing is a kind of hybrid electromagnetic coupled modes.As shown in Figure 1, coupled structure is made up of the 3rd microstrip line 3, the 4th microstrip line 4, the five microstrip lines 5, the seven microstrip lines 9, the eight microstrip lines 10, the nine microstrip lines 11.The coupled structure of resonator and main transmission line can be used admittance inverter J
01Expression, resonator can equivalence be the parallel connection of inductance and electric capacity, varactor capacitance is controlled by bias voltage.According to J.S.Hong and M.J.Lancaster, Microwave Filter for RF/Microwave Application, New York:John wiley, the classical Design of Filter theory of introducing in 2001. books and the circuit structure of filter module unit can get desired
C wherein
vBe varactor capacitance, Δ w is the absolute bandwidth of filter stop bend, Z
0Characteristic impedance for the radio circuit of filter application.Because J
01With the coupling coefficient between resonator and the main transmission line | K| is directly proportional, and can get
Capacitor C when variable capacitance diode
vWhen reducing, resonance frequency f increases.Can be got by above-mentioned relation, the invariable theory requirement of the absolute bandwidth Δ w of stopband is during the stopband center frequency tuning: coupling coefficient | K| will reduce along with the increase of stopband center frequency.This theory requirement can realize by following manner: between the coupled zone shown in the dotted portion among Fig. 2 (a), the length of resonator coupling unit microstrip line must make variable capacitance diode 7 under the minimum bias voltage and the mid point of the total equivalent microstrip line of resonator under the high bias voltage all on resonator coupling unit microstrip line, promptly at the highest resonance frequency f
MaxWith lowest resonant frequency f
MinIn the mid point of the equivalent microstrip line that last resonator is total drops between the coupled zone, make that magnetic coupling is occupied an leading position in the electromagnetic coupled.On this basis, the size of adjusting between the coupled zone is promptly adjusted d among Fig. 2 (a)
1And d
2The position.Between this coupled zone, magnetic coupling intensity reduces with the increase of frequency, electric coupling intensity increases with the increase of stopband center frequency, and total stiffness of coupling deducts electric coupling intensity for magnetic coupling intensity, therefore total coupling coefficient will reduce along with the increase of frequency, thereby absolute bandwidth keeps constant theoretical requirement can satisfy the stopband center frequency tuning time.Length d between the coupled zone
2-d
1Equal the length summation of the 3rd microstrip line 3, the four microstrip lines 4 and the 5th microstrip line 5; First microstrip line 1 and second microstrip line, 2 length sums are d
1The 6th microstrip line length is L-d
2Coupling spacing between the microstrip line between the coupled zone has determined total stiffness of coupling, and the coupling spacing is more little, and then total stiffness of coupling is strong more.
Two resonators and main transmission line are symmetrical arranged about the center longitudinal axis of microstrip structure, see into that from two ends, the left and right sides identical impedance operator is arranged, and constitute a modular unit; By the two or more modular units of cascade, can obtain the constant tunable band-stop filter of the higher absolute bandwidth of frequency selectivity.
Embodiment
Based on the structure of a modular unit of the constant tunable band-stop filter of the absolute bandwidth of modular construction as shown in Figure 1, relevant dimensions is illustrated in fig. 3 shown below.The thickness of medium substrate is 0.76mm, and relative dielectric constant is 2.94, and loss angle tangent is 0.0012.Connect microstrip line 12 and take snakelike broken line structure, can reduce circuit size.Capister 7 adopts the 1sv277 of Toshiba, and an end of capister is by metallization via hole ground connection.The total length L that connects microstrip line 12
12Being 25.4mm, is the quarter-wave of the centre frequency of turnable resonator frequency range.As shown in Figure 3, each dimension of microstrip line parameter of filter is as follows: first microstrip line 1 and the 3rd microstrip line 3 length L
1=5.6mm; Second microstrip line, 2 length L
2=1.88mm, the 4th microstrip line 4 length L
3=3.75mm, the 5th microstrip line 5 length L
4=9.8mm, the spacing L between the 7th microstrip line 9 and the 9th microstrip line 11
5=2mm, the 6th microstrip line 6 length L
6=1.7mm, the coupling spacing g between resonator and the main transmission line
1=0.12mm, the 6th microstrip line 6 width W
1=0.7mm connects microstrip line 12 width W
2=0.3mm, first microstrip line 1 and second microstrip line, 2 width W
4=0.7mm, the width W of the 3rd microstrip line 3, the 4th microstrip line 4 and the 5th microstrip line 5
3=0.4mm, the width W of the 7th microstrip line 9, the 8th microstrip line 10 and the 9th microstrip line 11
5=0.8mm, port microstrip line 8 width W
6=1.9mm.Select these microstrip lines length and width separately, to obtain transmission characteristic and out-of band rejection characteristic in required I/O impedance operator, the frequency band.Fig. 4 is the emulation and the practical test result of the tunable band-stop filter of the modular unit of employing that designs according to above-mentioned parameter; Transverse axis among the transfer curve figure is represented frequency, and the longitudinal axis is represented transmission characteristic | S
21|; Dotted line is a simulation result, and solid line is a test result.Test result is consistent with simulation result, and emulation and test are to use the commercial electromagnetism ADS of simulation software of Agilent company and E5071C network analyzer to finish respectively.By test result as seen, the centre frequency of stopband can be regulated in the 1.73-2.2GHz scope; Transfer curve among Fig. 4 is to record when the stopband center frequency is respectively 1.73GHz, 1.8GHz, 1.9GHz, 2.0GHz, 2.1GHz, 2.2GHz, with band stop filter commonly used-20dB suppresses level as standard, the bandwidth at-20dB place is respectively 48MHz, 48MHz, 49MHz, 52MHz, 53MHz, 53MHz; This shows that the bandwidth at-20dB place is 50 ± 3MHz, absolute bandwidth almost remains unchanged when meaning frequency tuning.The test result explanation, this embodiment has realized the constant target of absolute bandwidth that the present invention will reach.
Fig. 5 is the structural representation that adopts the tunable band-stop filter of two modular units, and adopting the purpose of two modular units is in order to improve the inhibition level of stopband.The left and right sides two-port of filter module unit has identical impedance operator, just can be directly when 50 Ω are all adjusted in the impedance of these two ports two modular units raising frequency selectivity that cascades up, realize higher order filter.By 50 Ω transmission lines 13 two same filter modular units among Fig. 1 are cascaded up and to obtain the higher tunable band-stop filter of frequency selectivity; For fear of two filter module unit generation mutual coupling, the length of transmission line 13 should be greater than 1.5 times of dielectric substrate thickness.Fig. 6 is emulation and the practical test result that adopts the tunable band-stop filter of two modular units, and the transverse axis among the transmission characteristic figure is represented frequency, and the longitudinal axis is represented transmission characteristic | S
21|; Dotted line is a simulation result, and solid line is a test result; Emulation and test are to use the commercial electromagnetism ADS of simulation software of Agilent company and E5071C network analyzer to finish respectively.Test result shows that the stopband center frequency can be carried out tuning in the 1.73-2.2GHz scope; Transfer curve among Fig. 6 is to record when the stopband center frequency is respectively 1.73GHz, 1.8GHz, 1.9GHz, 2.0GHz, 2.1GHz, 2.2GHz, and the bandwidth at-40dB place is respectively 58MHz, 62MHz, 61MHz, 62MHz, 58MHz, 57MHz; This shows that the bandwidth at-40dB place is 60 ± 3MHz, mean tuning along with the stopband center frequency, it is invariable that the absolute bandwidth of stopband keeps, and realized the target that bandwidth is constant.
Emulation and the test result of embodiment show that when the centre frequency of stopband was tuning, the absolute bandwidth among the embodiment remained unchanged substantially, had realized the target that absolute bandwidth is constant.The present invention has modular nature, just can realize the tunable band-stop filter that frequency selectivity is higher by simple cascade.
The above only is a preferred embodiments of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. based on the constant tunable band-stop filter of the absolute bandwidth of modular construction, comprise the microstrip structure on upper strata, the medium substrate in intermediate layer and the grounding plate of lower floor; The upper strata microstrip structure is attached to intermediate layer dielectric-slab upper surface, and intermediate layer dielectric-slab lower surface is a grounded metal; It is characterized in that: the microstrip structure on upper strata comprises two resonators and main transmission line; Two resonators all are half-wave resonator, and structure is identical, are symmetrical arranged about the center longitudinal axis of microstrip structure; Each resonator is made of microstrip line and variable capacitance diode; The variable capacitance diode of two resonators is provided with identical bias voltage; The microstrip line of resonator is divided into coupling unit and non-coupling unit; The microstrip line coupling unit of resonator is by the 3rd microstrip line, and the 4th microstrip line and the 5th microstrip line are in turn connected into n shape structure; The non-coupling unit of the microstrip line of resonator comprises first microstrip line, second microstrip line and the 6th microstrip line; The one end open circuit of first microstrip line, the other end links to each other with second microstrip line; The other end of second microstrip line is connected with the 3rd microstrip line; The 6th microstrip line one end is connected with the 5th microstrip line, and the other end links to each other with variable capacitance diode; The metallization via hole of the other end of variable capacitance diode through passing the intermediate layer medium substrate links to each other with the lower floor grounded metal; Described main transmission line comprises coupling unit and non-coupling unit; Its coupling unit is by the 7th microstrip line, and the 8th microstrip line and the 9th microstrip line connect and compose n shape structure successively, is positioned at the inboard of resonator coupling unit n shape structure; Being provided with width between resonator coupling unit and the main transmission line coupling unit is the electromagnetic coupled spacing of 0.1mm-0.8mm; The non-coupling unit of main transmission line comprises the port microstrip line and is connected microstrip line; The connection microstrip line is a serpentine; Connect the microstrip line bilateral symmetry port microstrip line, the 7th microstrip line, the 8th microstrip line, the 9th microstrip line are set; Port microstrip line one end is connected with the 7th microstrip line; Connecting microstrip line is connected with the 9th microstrip line; The length of described connection microstrip line
Wherein c is the light velocity, ε
rBe the relative dielectric constant of medium substrate,
f
MinAnd f
MaxBe respectively the minimum value and the maximum of the resonance frequency f adjustable extent of resonator; The electrical length L+ Δ L of resonator be resonance frequency f correspondence wavelength X 1/2nd; Wherein, L is actual microstrip line length, and Δ L is a variable capacitance diode equivalence microstrip line length; Actual microstrip line length L is the length sum of first microstrip line, second microstrip line, the 3rd microstrip line, the 4th microstrip line, the 5th microstrip line and the 6th microstrip line; Length between the coupled zone equals the 3rd microstrip line, the length summation of the 4th microstrip line and the 5th microstrip line.
2. according to claim 1 based on the constant tunable band-stop filter of the absolute bandwidth of modular construction, it is characterized in that, the turnable resonator frequency range of described tunable band-stop filter is 1.73-2.2GHz, the length of first microstrip line and the 3rd microstrip line is 5.6mm, the length of second microstrip line is 1.88mm, the length of the 4th microstrip line is 3.75mm, the length of the 5th microstrip line is 9.8mm, spacing between the 7th microstrip line and the 9th microstrip line is 2mm, the length of the 6th microstrip line is 1.7mm, coupling spacing between resonator and the main transmission line is 0.12mm, the width of the 6th microstrip line is 0.7mm, the width that connects microstrip line is 0.3mm, the width of first microstrip line and second microstrip line is 0.7mm, the 3rd microstrip line, the width of the 4th microstrip line and the 5th microstrip line is 0.4mm, the 7th microstrip line, the width of the 8th microstrip line and the 9th microstrip line is 0.8mm, the width of port microstrip line is 1.9mm, connects the length L of microstrip line
12Be 25.4mm.
3. according to claim 1 based on the constant tunable band-stop filter of the absolute bandwidth of modular construction, it is characterized in that, two identical tunable band-stop filter modular units connect the tunable band-stop filter that obtains two-stage by 50 Ω transmission lines, and the length of transmission line is greater than 1.5 times of dielectric substrate thickness.
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| CN109980327A (en) * | 2019-04-15 | 2019-07-05 | 南京航空航天大学 | It is a kind of with highly selective and constant bandwidth adjustable bimodule band-pass filter |
| CN110034363A (en) * | 2019-04-04 | 2019-07-19 | 电子科技大学 | A kind of microwave electricity tune bandstop filter based on open-end microstrip line construction |
| CN111262546A (en) * | 2020-01-21 | 2020-06-09 | 杭州电子科技大学 | LTCC filter with adjustable center frequency and fixed absolute bandwidth and simulation method |
| CN113422182A (en) * | 2021-07-02 | 2021-09-21 | 杭州电子科技大学 | Adjustable low-pass filter based on impedance tuning |
| CN114499455A (en) * | 2022-01-17 | 2022-05-13 | 西南交通大学 | All-pass adjustable delay filter circuit |
| CN114826187A (en) * | 2022-03-29 | 2022-07-29 | 清华大学 | Filter and electronic device |
| CN117977145A (en) * | 2024-04-01 | 2024-05-03 | 南京邮电大学 | Microstrip coupling line non-magnetic circulator based on time modulation |
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| CN117977145B (en) * | 2024-04-01 | 2024-06-07 | 南京邮电大学 | Microstrip coupling line non-magnetic circulator based on time modulation |
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