CN103117426B - Radio frequency reconfigurable band-pass filter with wide bandwidth adjusting range and controllable performance - Google Patents
Radio frequency reconfigurable band-pass filter with wide bandwidth adjusting range and controllable performance Download PDFInfo
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Abstract
The invention relates to a novel radio frequency reconfigurable band-pass filter with a wide bandwidth adjusting range and controllable performance. The reconfigurable band-pass filter comprises an upper micro-strip structure, a middle dielectric substrate and lower grounded metal, wherein the upper micro-strip structure is formed by connecting an input port, an input feed network, an input adjustable impedance matching circuit, a cross adjustable multi-mode resonator, an output adjustable impedance matching circuit, an output feed network and an output port in sequence; the cross adjustable multi-mode resonator consists of two micro-strip lines which are perpendicular to each other, and four terminated variable capacitance diodes; and each of the input adjustable impedance matching circuit and the output adjustable impedance matching circuit is formed by connecting a series variable capacitance diode and a parallel variable capacitance diode. The reconfigurable band-pass filter has the advantages of wide center frequency and bandwidth adjusting range, controllable filtering performance and the like, can be reconfigured into broad-band or narrow-band band-pass filters with different center frequencies, and can be used for a reconfigurable radio frequency front end.
Description
Technical field
The present invention relates to a kind of novel radio frequency electrically adjusted band-pass filter based on variable capacitance diode, be specifically related to the controlled RF reconfigurable band pass filter of a kind of bandwidth adjustment wide ranges and performance.
Background technology
Electrically tunable filter is one of key technology of the aspects such as frequency hopping spread spectrum (FHSS) communication technology, unjammable radar, dynamic frequency allocation technology, multi function receiver, spurious emissions measurement.Since World War II, electrically tunable filter always is one of focus of various countries' research.Aspect this, there have been at present some research reports, the electrically tunable filter of various structures is suggested.Yet the fast development of radar and the communication technology has proposed higher performance requirement to electrically tunable filter in recent years.
Modern ULTRA-WIDEBAND RADAR and radio communication require to adopt high performance restructural radio-frequency front-end.In order to make full use of and to merge various wireless channel and communication standard, radio-frequency front-end need to be operated in different frequency and bandwidth, and this just requires a kind of restructural radio-frequency front-end simultaneously with frequency and bandwidth adjustment ability.The restructural filter (fully tunable filter) with frequency and bandwidth adjustment ability is the important component part of restructural radio-frequency front-end.This kind of filter is one of the forward position of electrically tunable filter research and trend, only has in the world at present a small amount of bibliographical information (be no more than 10 pieces, and be substantially all published on Trans), but the following problem of ubiquity:
(1) bandwidth adjustment scope is less, and due to the problem of structural design aspect, the restructural filter with frequency and bandwidth adjustment ability all can only be realized maximum and be no more than 15% bandwidth.And broadband connections technology is more ripe at present, and entered the practical stage.Although the research of broadband filter is carried out for many years, and has obtained great successes, yet the development aspect of broadband restructural filter is all extremely rare both at home and abroad.Obviously maximum 15% bandwidth can not meet the demand of modern broadband communication system far away.
(2) when centre frequency or bandwidth change, can not keep stable filtering performance, little when large while being mainly manifested in return loss, the aspect such as passband ripple is inhomogeneous, has affected the stability of entire system response.The filtering performance of mentioning in the present invention mainly comprises return loss, ripple characteristics, Out-of-band rejection degree and insertion loss etc.
For the little problem of bandwidth adjustment scope, though there is document to research and develop the electrically tunable filter of the adjustable bandwidth in some broadbands, often can not freely control its centre frequency, be therefore limited by very large in actual applications.Multimode resonator is taught in 2005 and is proposed by Lei Zhu the earliest, owing to having comprised a plurality of modes of resonance in single resonator simultaneously, so be widely applied in the design of broadband filter.But up to the present also about how, multimode resonator is not applied to all reports in adjustable restructural filter of frequency and bandwidth.
The problem that keeps stationary filtering performance during for centre frequency and bandwidth adjustment, up to the present also without any stable or control the research report of filtering performance when centre frequency and the bandwidth adjustment about how.
Except above-mentioned two common problems, the problem such as it is large that the restructural filter that part has frequency and a bandwidth adjustment ability also exists insertion loss, and the control DC power supply needing is many, and volume is large.
In a word, in the design of current restructural filter, also need to solve bandwidth adjustment scope problem little, the aspect such as unstable properties while regulating.
Summary of the invention
The object of the present invention is to provide a kind of restructural band pass filter based on the adjustable multimode resonator of microstrip line and adjustable impedance match circuit, this restructural band pass filter can be realized up to 83% frequency-tuning range and 95% bandwidth, can regulate and control its filtering performance under each operating frequency and bandwidth status simultaneously.
The technical solution adopted for the present invention to solve the technical problems is: the RF reconfigurable band pass filter that a kind of bandwidth adjustment wide ranges and performance are controlled, comprises the microstrip structure on upper strata, the grounded metal of interlayer substrate and lower floor; Upper strata microstrip structure is attached to interlayer upper surface of base plate, and the lower surface in intermediate layer is grounded metal; The microstrip structure on upper strata is connected and composed in turn by an input port, an input feeding network, an input adjustable impedance match circuit, an adjustable multimode resonator of cross, an output adjustable impedance match circuit, an output feeding network and an output port; Cross is adjustable, and four variable capacitance diodes that multimode resonator is connected with two ends by orthogonal two microstrip lines form, wherein horizontal microstrip line is connected respectively a variable capacitance diode with the two ends of vertical microstrip line, be specially: cross is adjustable, and multimode resonator comprises horizontal rectangular microstrip line and vertical rectangle microstrip line, one end of horizontal microstrip line connects the first variable capacitance diode, and the other end connects the second variable capacitance diode; Vertical microstrip line passes from the middle point vertical of horizontal microstrip line, and one end connects the 3rd variable capacitance diode, and the other end connects the 4th variable capacitance diode;
Input adjustable impedance match circuit comprises the 5th variable capacitance diode and the first variable capacitance diode, and described the 5th variable capacitance diode is all connected with the horizontal microstrip line of the adjustable multimode resonator of cross with the first variable capacitance diode; Output adjustable impedance match circuit comprises the 6th variable capacitance diode and the second variable capacitance diode, and described the 6th variable capacitance diode and the second variable capacitance diode are all connected with the other end of the horizontal microstrip line of the adjustable multimode resonator of cross; Input feeding network comprises in turn 50 ohm of rectangular microstrip lines and the first capacitance connecting, the other end of described the first capacitance is connected with the 5th variable capacitance diode, output feeding network comprises in turn 50 ohm of rectangular microstrip lines and the second capacitance connecting, and the other end of described the second capacitance is connected with the 6th variable capacitance diode; The characteristic impedance of input port and output port is 50 ohm; Described cross is adjustable, and multimode resonator left and right mirror image is symmetrical; Input adjustable impedance match circuit, output adjustable impedance match circuit, input feeding network, output feeding network, input port, that output port is left and right mirror image is symmetrical; Whole filter construction left and right mirror image is symmetrical; During filter work, the first variable capacitance diode, the second variable capacitance diode can be equivalent to the parallel connection of a variable reactance and a variable capacitance, wherein variable reactance part participates in respectively having formed input adjustable impedance match circuit, output adjustable impedance match circuit, and variable capacitance subparticipation has formed the adjustable multimode resonator of cross.
In the controlled RF reconfigurable band pass filter of above-mentioned bandwidth adjustment wide ranges and performance, the vacant end of described variable capacitance diode is all connected with lower floor grounded metal through interlayer substrate.
In order further to realize object of the present invention, in the controlled RF reconfigurable band pass filter of above-mentioned bandwidth adjustment wide ranges and performance, the long 4～50mm of horizontal microstrip line in described cross is adjustable multimode resonator, wide 0.2～2mm; The vertical wide 0.2～3mm of microstrip line, the long 2～30mm of part above horizontal microstrip line, the long 1～20mm of part below horizontal microstrip line.In described feeding network, the capacitance of two capacitances is identical and all more than 6pF.
The DIELECTRIC CONSTANT ε of above-mentioned medium substrate
rbeing 2～10, is highly 0.2～1mm.
In the controlled RF reconfigurable band pass filter of the bandwidth adjustment wide ranges of the present invention design and performance, described cross adjustable multimode resonator can be realized larger frequency and bandwidth adjustment scope, has solved the limited problem of current restructural filter bandwidht; Described cross adjustable multimode resonator has the limit of three independent regulation simultaneously, can guarantee uniform ripple in passband, reduces insertion loss; Described adjustable impedance match circuit can guarantee impedance matching good between adjustable multimode resonator and feeding network in adjustment process, makes the filtering performances such as return loss, Out-of-band rejection degree, ripple characteristics controlled.
Compared with prior art, its remarkable advantage is: 1) the present invention has designed the adjustable multimode resonator of microstrip line cross and adjustable impedance match circuit, and they have been combined into a kind of novel controlled restructural band pass filter of broadband and wide bandwidth adjustable range and filtering performance that has; 2) the above-mentioned adjustable multimode resonator of microstrip line cross has three band inpolars of energy independent regulation, can realize wider bandwidth; In actual measurement, bandwidth can reach 95%, far beyond existing electrically tunable filter, has reached the standard of broadband connections; This tunable resonator can be realized wider frequency-tuning range simultaneously; In actual measurement, tuning range can reach 83%, higher than other designs of existing based semiconductor variable capacitance diode; 3) three of the above-mentioned adjustable multimode resonator of microstrip line cross band inpolars all can independent regulation, by the frequency of three limits of balance, can guarantee under the operating state of different centre frequencies and bandwidth, all can keep in passband ripple even; 4) above-mentioned adjustable impedance match circuit can regulate mating between adjustable multimode resonator and feeding network, changes the external sort factor of this filter in a big way, thereby has affected the filtering performance of this restructural filter; The return loss of the restructural band pass filter described in the present invention and Out-of-band rejection degree all can regulate by above-mentioned adjustable impedance match circuit; In actual measurement, return loss can be by the stable 15dB left and right that is controlled at, and attenuation outside a channel is controlled at 18dB left and right; 5) the above-mentioned adjustable multimode resonator of microstrip line cross has zero point outside two bands that can move with passband, has improved the squareness factor of passband, has greatly improved the selectivity of restructural filter; 6) because the restructural band pass filter described in the present invention does not exist in traditional structure, energy is not caused to the coupled structure compared with lossy, therefore there is less insertion loss; In actual measurement, insertion loss is between 0.95 ~ 3.5dB; 7) compare with the restructural filter with frequency bandwidth regulating power of same order, this restructural filter needs less control DC power supply, and this is to be brought by the characteristic of adjustable multimode resonator; 8) compare with existing other designs, owing to having introduced the adjustable multimode resonator of above-mentioned cross, the design of this restructural filter construction is more succinct, and volume is also less.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the controlled restructural band pass filter of frequency and bandwidth adjustment wide ranges and performance.
Fig. 2 is the schematic diagram of the adjustable multimode resonator of cross in Fig. 1.
Fig. 3 a is the even mould equivalent electric circuit of the adjustable multimode resonator of cross in Fig. 2.
Fig. 3 b is the strange mould equivalent electric circuit of the adjustable multimode resonator of cross in Fig. 2.
Fig. 4 a is that the pole and zero of the adjustable multimode resonator of cross in Fig. 2 is with C
effthe graph of a relation changing.
Fig. 4 b is that the pole and zero of the adjustable multimode resonator of cross in Fig. 2 is with C
2, C
3the graph of a relation changing.
Fig. 5 a is the schematic diagram that the restructural band pass filter in Fig. 1 regulates impedance matching.
Fig. 5 b regulates the equivalent electric circuit of impedance matching principle figure in Fig. 5 a.
Fig. 5 c is external sort factor and the impedance transformation ratio R of the restructural band pass filter in Fig. 1
zgraph of a relation.
Fig. 6 a is transmission characteristic and the return loss plot that filtering performance is stable, bandwidth remains unchanged, centre frequency regulates.
Fig. 6 b is that filtering performance is stable, centre frequency remains unchanged, transmission characteristic and the return loss plot of bandwidth adjustment.
Fig. 6 c is that centre frequency remains unchanged with bandwidth, the corresponding transmission characteristic of different external sort factors and return loss plot while regulating filtering performance.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further detailed explanation, but the scope of protection of present invention is not limited to the scope of lower example statement.
As shown in Figure 1, the RF reconfigurable band pass filter that a kind of bandwidth adjustment wide ranges and performance are controlled, comprises the microstrip structure on upper strata, the grounded metal of interlayer substrate and lower floor; Upper strata microstrip structure is attached to interlayer upper surface of base plate, and the lower surface in intermediate layer is grounded metal;
The microstrip structure on upper strata is connected and composed in turn by an input port, an input feeding network, an input adjustable impedance match circuit, an adjustable multimode resonator of cross, an output adjustable impedance match circuit, an output feeding network and an output port; Cross is adjustable, and four variable capacitance diodes that multimode resonator is connected with two ends by orthogonal two microstrip lines form, wherein horizontal microstrip line is connected respectively a variable capacitance diode with the two ends of vertical microstrip line, be specially: cross is adjustable, and multimode resonator comprises horizontal rectangular microstrip line 2 and vertical rectangle microstrip line 3, one end of horizontal microstrip line 2 connects the first variable capacitance diode 8, and the other end connects the second variable capacitance diode 9; Vertical microstrip line 3 passes from the middle point vertical of horizontal microstrip line 2, and one end connects the 3rd variable capacitance diode 11, and the other end connects the 4th variable capacitance diode 12;
Input adjustable impedance match circuit comprises the 5th variable capacitance diode 7 and the first variable capacitance diode 8, and described the 5th variable capacitance diode 7 is all connected with the horizontal microstrip line 2 of the adjustable multimode resonator of cross with the first variable capacitance diode 8; Output adjustable impedance match circuit comprises the 6th variable capacitance diode 10 and the second variable capacitance diode 9, and described the 6th variable capacitance diode 10 and the second variable capacitance diode 9 are all connected with the other end of the horizontal microstrip line 2 of the adjustable multimode resonator of cross; Input feeding network comprises in turn 50 ohm of rectangular microstrip lines 1 and the first capacitance 5 connecting, the other end of described the first capacitance 5 is connected with the 5th variable capacitance diode 7, output feeding network comprises in turn 50 ohm of rectangular microstrip lines 4 and the second capacitance 6 connecting, and the other end of described the second capacitance 6 is connected with the 6th variable capacitance diode 10; The characteristic impedance of input port and output port is 50 ohm; Described cross is adjustable, and multimode resonator left and right mirror image is symmetrical; Input adjustable impedance match circuit, output adjustable impedance match circuit, input feeding network, output feeding network, input port, that output port is left and right mirror image is symmetrical; Whole filter construction left and right mirror image is symmetrical; During filter work, the first variable capacitance diode 8, the second variable capacitance diode 9 can be equivalent to the parallel connection of a variable reactance and a variable capacitance, wherein variable reactance part participates in respectively having formed input adjustable impedance match circuit, output adjustable impedance match circuit, and variable capacitance subparticipation has formed the adjustable multimode resonator of cross; Be specially: as shown in Fig. 5 (a), the first variable capacitance diode 8 is equivalent to a variable reactance jX and a variable capacitance C
effparallel connection, wherein variable reactance jX participates in having formed input adjustable impedance match circuit, variable capacitance C
effparticipation has formed the adjustable multimode resonator of cross; The second variable capacitance diode 9 is equivalent to the parallel connection of a variable reactance and a variable capacitance, and wherein variable reactance subparticipation has formed output adjustable impedance match circuit, and variable capacitance subparticipation has formed the adjustable multimode resonator of cross.
In the controlled RF reconfigurable band pass filter of above-mentioned bandwidth adjustment wide ranges and performance, the vacant end of described variable capacitance diode is all connected with lower floor grounded metal through interlayer substrate.
In the controlled RF reconfigurable band pass filter of above-mentioned bandwidth adjustment wide ranges and performance, the long 4～50mm of horizontal microstrip line 2 in described cross is adjustable multimode resonator, wide 0.2～2mm; The vertical wide 0.2～3mm of microstrip line 3, the long 2～30mm of part above horizontal microstrip line, the long 1～20mm of part below horizontal microstrip line.In described feeding network, the capacitance of two capacitances is identical and all more than 6pF.
The DIELECTRIC CONSTANT ε of above-mentioned medium substrate
rbeing 2～10, is highly 0.2～1mm.
Because the adjustable micro-band multimode resonator of above-mentioned cross is symmetrical structure, as shown in Figure 2, C wherein
effrepresent the first variable capacitance diode 8(or the second variable capacitance diode 9) participate in to form the partition capacitance value of the adjustable multimode resonator of this cross; Therefore can utilize the method for parity mode equivalent electric circuit to calculate its resonance frequency.Fig. 3 a is the even mould equivalent electric circuit of the adjustable multimode resonator of cross.For the ease of analyzing, select Z
1=2Z
2,, two corresponding even mould resonance frequency f
e1, f
e2by following formula, solved:
Wherein, Z
1for the characteristic impedance of horizontal rectangular microstrip line 2, Y
1for the characteristic admittance of horizontal rectangular microstrip line 2, Z
2for the characteristic impedance of vertical rectangle microstrip line 3, Y
2characteristic admittance for vertical rectangle microstrip line 3; l
1physical length for horizontal rectangular microstrip line 2; l
2that vertical rectangle microstrip line 3 is in the physical length of horizontal rectangular microstrip line 2 upper sections; l
3it is the physical length of vertical rectangle microstrip line 3 part below horizontal rectangular microstrip line 2; C is the free space light velocity, ε
reffective dielectric constant for medium substrate; f
o, f
e1, f
e2, f
tZ1, f
tZ2respectively in corresponding Fig. 5 in the limit in the middle of in passband, passband the limit on the left side, the resonance frequency at the zero point in the limit on the right, the outer left side of passband stopband, the zero point in the stopband of the outer the right of passband in passband; C
effrepresent the first variable capacitance diode 8(or the second variable capacitance diode 9) participate in to form the partition capacitance value of the adjustable multimode resonator of this cross; C
2the capacitance that represents the 3rd variable capacitance diode 11; C
3the capacitance that represents the 4th variable capacitance diode 12.
Fig. 3 b is the strange mould equivalent electric circuit of the adjustable multimode resonator of cross, its strange mould resonance frequency f
ocan be solved by following formula:
In addition, the vertical rectangle microstrip line 3 on symmetrical axis has also produced two transmission zero f
tZ1, f
tZ2, its frequency can be solved by following formula:
Fig. 4 has vividly described variable capacitance diode in the above-mentioned resonator relation that affects on three limits and two zero points.Known in figure, three limit f
o, f
e1, f
e2frequency can be by controlling and balance C
eff, C
2, C
3realize independent regulation, the centre frequency of filter and bandwidth all can be regulated; When the electric capacity value of variable capacitance diode is in the middle of A point and B point, three limits form a passband, and locate, outside passband band, to contribute to improve the selectivity of filter two zero points.In Fig. 4 a, f
o, f
e1, f
e2, f
tZ1, f
tZ2the limit on the left side in limit in the middle of respectively in corresponding passband, passband is, the resonance frequency at the zero point in the limit on the right, the outer left side of passband stopband, the zero point in the stopband of the outer the right of passband in passband; In Fig. 4 b, f
o, f
e1, f
e2, f
tZ1, f
tZ2the limit on the left side in limit in the middle of respectively in corresponding passband, passband is, the resonance frequency at the zero point in the limit on the right, the outer left side of passband stopband, the zero point in the stopband of the outer the right of passband in passband; C
2the capacitance that represents the 3rd variable capacitance diode 11; C
3the capacitance that represents the 4th variable capacitance diode 12.
While being operated in different center frequency or bandwidth or filtering performance due to the adjustable multimode resonator of above-mentioned cross, need different external sort factors to match with it, the present invention has designed adjustable impedance match circuit.As shown in Figure 5 a, corresponding equivalent electric circuit as shown in Figure 5 b for the principle of its adjusting impedance matching.The first variable capacitance diode 8 in parallel can be equivalent to a variable reactance jX and a variable capacitance C
effparallel connection; Wherein variable reactance part has formed adjustable impedance match circuit with the 5th variable capacitance diode 7,50 ohm microstrip of connecting, as shown in Fig. 5 b dotted line frame, this adjustable impedance match circuit can be equivalent to a J/K phase inverter that coefficient is variable, wherein, 50 Ω TL are 50 ohm transmission line, B is the corresponding susceptance value of variable capacitance diode 7, and X is the jX in equivalence part parallel reactance (corresponding diagram 5(a) out in variable capacitance diode 8).Adjustable impedance match circuit is from tap feed between horizontal rectangular microstrip line 2 and the first variable capacitance diode 8.Theoretical according to the design of filter of introducing in monograph " J.S.Hong and M.J.Lancaster; Microwave Filter for RF/Microwave Application; New York:John Wiley & Sons; 2001. ", tap feed can be equivalent to a transformer.Therefore this restructural filter regulates the principle of impedance matching can be equivalent to connecting of the variable J/K phase inverter of coefficient and a transformer, its impedance transformation ratio R
zmay be defined as:
For K phase inverter:
wherein K is the coefficient of K phase inverter;
For J phase inverter:
wherein J is the coefficient of J phase inverter.
Shown in Fig. 5 c, be external sort factor and impedance transformation ratio R
zgraph of a relation.At R
zduring variation, external sort factor can be got a value in suitable wide region, has met the externally requirement of component prime factor under arrowband and wideband scenarios simultaneously.
In the following embodiments, on the medium substrate that have that the controlled restructural band pass filter of 600MHz-1450MHz frequency and bandwidth adjustment wide ranges and performance is produced on that relative dielectric constant is 3.38, thickness 0.8128mm, fissipation factor is 0.0027.
Embodiment: the restructural band pass filter that 600MHz-1450MHz frequency and bandwidth adjustment wide ranges and performance are controlled.
The controlled restructural band pass filter of 600MHz-1450MHz frequency and bandwidth adjustment wide ranges and performance as shown in Figure 1.Design parameter is: the long 32mm of horizontal rectangular microstrip line 2, wide 1mm; The wide 2mm of vertical rectangle microstrip line 3, the long 10.5mm of part above horizontal microstrip line, the long 4.2mm of part below horizontal microstrip line; The capacitance of capacitance 5,6 is 15pF; 50 ohm microstrip 1,4 length are not limit, wide 1.9mm.The 3rd variable capacitance diode 11, the 4th variable capacitance diode 12 are selected the silicon variable capacitance diode 1sv232 of Toshiba, and the 5th variable capacitance diode 7, the first variable capacitance diode 8, the second variable capacitance diode 9, the 6th variable capacitance diode 10 are selected the silicon variable capacitance diode JDV2S71E of Toshiba.Fig. 6 has provided the result of utilizing the designed filter of above-mentioned parameter to carry out emulation and actual measurement, and wherein emulation and actual measurement complete with the MS4624D vector network analyzer of the ADSHe Anli company of business electromagnetism simulation software of Agilent company respectively.In order to show the performance characteristics of this filter, in this example, minute three kinds of mode of operations are shown: a kind of pattern is that filtering performance is stable, bandwidth is constant, regulates centre frequency; A kind of pattern is that filtering performance is stable, centre frequency is constant, regulates bandwidth; Centered by another kind of pattern, frequency and bandwidth are constant, regulate filtering performance.Shown in Fig. 6 a is that this filter filtering property retention is stable, the constant 300MHz of being of bandwidth, transmission characteristic and the coverage diagram of the emulation while regulating centre frequency and actual test, and transverse axis represents frequency, the longitudinal axis represents transmission characteristic | S
21| and return loss | S
11|; Shown in Fig. 6 b is that this filter filtering property retention is stable, the constant 1GHz of being of centre frequency, transmission characteristic and the coverage diagram of emulation and actual test while regulating bandwidth, and transverse axis represents frequency, the left longitudinal axis represents transmission characteristic | S
21|, the right longitudinal axis represents return loss | S
11|; Centered by shown in Fig. 6 c, frequency and bandwidth remain unchanged, transmission characteristic and the coverage diagram of emulation while changing this filter external sort factor, and transverse axis represents frequency, the longitudinal axis represents transmission characteristic | S
21| and return loss | S
11|.From this three width figure, the band connection frequency tuning range of filter, from 600MHz to 1450MHz, has 82.9% relative bandwidth adjustable range, its absolute bandwidth adjustable range from 120MHz to 950MHz, corresponding relative bandwidth adjustable range from 12% to 95%.The frequency tuning range of this filter and bandwidth adjustment scope have all surmounted existing filter.The standard of general broadband connections is relative bandwidth more than 20%, and the bandwidth adjustment scope of this filter, considerably beyond this standard, has realized the reconfigurable filter characteristic in broadband.When centre frequency or bandwidth variation, the excursion of insertion loss be 0.95dB to 3.5dB, return loss remains on about 15dB, attenuation outside a channel remains on 18dB left and right, and ripple is very even, in frequency and bandwidth adjustment, kept stable filtering characteristic.By regulating the DC offset voltage of adjustable impedance match circuit, can select different return loss, Out-of-band rejection degree etc. according to performance requirement.Up to the present, there is no other designs and realized this characteristic.The squareness factor that has improved passband zero point outside this filter band, has met in Modern Communication System optionally requirement of filter in addition.
The invention discloses a kind of novel restructural filter construction being formed by the adjustable multimode resonator of cross and adjustable impedance match circuit, wider frequency tuning range and bandwidth adjustment scope have not only been realized, and its band-pass behavior is controlled, also possessed the advantages such as insertion loss is low, volume is little, required DC power supply is few, structural design is simple.By the parameter of adjusted design, this structure can realize the high-performance restructural band pass filter of various frequencies, bandwidth and filtering performance requirement.
The foregoing is only preferred embodiments of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. the controlled RF reconfigurable band pass filter of bandwidth adjustment wide ranges and performance, comprises the microstrip structure on upper strata, the grounded metal of interlayer substrate and lower floor; Upper strata microstrip structure is attached to interlayer upper surface of base plate, and the lower surface in intermediate layer is grounded metal, it is characterized in that;
The microstrip structure on upper strata is connected and composed in turn by an input port, an input feeding network, an input adjustable impedance match circuit, an adjustable multimode resonator of cross, an output adjustable impedance match circuit, an output feeding network and an output port; Cross is adjustable, and four variable capacitance diodes that multimode resonator is connected with two ends by orthogonal two microstrip lines form, wherein horizontal microstrip line is connected respectively a variable capacitance diode with the two ends of vertical microstrip line, be specially: cross is adjustable, and multimode resonator comprises horizontal rectangular microstrip line [2] and vertical rectangle microstrip line [3], one end of horizontal microstrip line [2] connects the first variable capacitance diode [8], and the other end connects the second variable capacitance diode [9]; Vertical microstrip line [3] passes from the middle point vertical of horizontal microstrip line [2], and one end connects the 3rd variable capacitance diode [11], and the other end connects the 4th variable capacitance diode [12];
Input adjustable impedance match circuit comprises the 5th variable capacitance diode [7] and the first variable capacitance diode [8], and described the 5th variable capacitance diode [7] is all connected with the horizontal microstrip line [2] of the adjustable multimode resonator of cross with the first variable capacitance diode [8]; Output adjustable impedance match circuit comprises the 6th variable capacitance diode [10] and the second variable capacitance diode [9], and described the 6th variable capacitance diode [10] and the second variable capacitance diode [9] are all connected with the other end of the horizontal microstrip line [2] of the adjustable multimode resonator of cross; Input feeding network comprises 50 ohm of rectangular microstrip lines [1] and the first capacitance [5] connecting in turn, the other end of described the first capacitance [5] is connected with the 5th variable capacitance diode [7], output feeding network comprises 50 ohm of rectangular microstrip lines [4] and the second capacitance [6] connecting in turn, and the other end of described the second capacitance [6] is connected with the 6th variable capacitance diode [10]; The characteristic impedance of input port and output port is 50 ohm; Described cross is adjustable, and multimode resonator left and right mirror image is symmetrical; Input adjustable impedance match circuit, output adjustable impedance match circuit, input feeding network, output feeding network, input port, that output port is left and right mirror image is symmetrical; Whole filter construction left and right mirror image is symmetrical; During filter work, the first variable capacitance diode [8], the second variable capacitance diode [9] can be equivalent to the parallel connection of a variable reactance and a variable capacitance, wherein variable reactance part participates in respectively having formed input adjustable impedance match circuit, output adjustable impedance match circuit, and variable capacitance subparticipation has formed the adjustable multimode resonator of cross.
2. the controlled RF reconfigurable band pass filter of bandwidth adjustment wide ranges according to claim 1 and performance, is characterized in that, the vacant end of above-mentioned variable capacitance diode is all connected with lower floor grounded metal through interlayer substrate.
3. the controlled RF reconfigurable band pass filter of bandwidth adjustment wide ranges according to claim 1 and performance, is characterized in that, the long 4～50mm of horizontal microstrip line [2] in described cross is adjustable multimode resonator, wide 0.2～2mm; The vertical wide 0.2～3mm of microstrip line [3], the long 2～30mm of part above horizontal microstrip line, the long 1～20mm of part below horizontal microstrip line, in described feeding network, the capacitance of two capacitances is identical and all more than 6pF.
4. according to the bandwidth adjustment wide ranges described in claim 1,2 or 3 and the controlled RF reconfigurable band pass filter of performance, it is characterized in that: the DIELECTRIC CONSTANT ε of medium substrate
rbeing 2～10, is highly 0.2～1mm.
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| CN103346368A (en) * | 2013-06-08 | 2013-10-09 | 浙江理工大学 | Reconfigurable microwave low-pass filter |
| CN104659452B (en) * | 2013-11-22 | 2017-06-27 | 南京理工大学 | A kind of dual trap frequency ultra wide band bandpass filter based on cross resonator |
| CN104362414B (en) * | 2014-10-21 | 2017-01-11 | 南京航空航天大学 | Bandwidth-reconfigurable band-pass filter |
| CN107425245B (en) * | 2017-06-16 | 2019-11-22 | 南京信息工程大学 | A kind of restructural multi-mode filter of novel micro-strip |
| CN109391245B (en) * | 2018-12-04 | 2024-02-27 | 上海健康医学院 | LC band-pass filter with wide-range electric tuning |
| CN111224227B (en) * | 2020-01-10 | 2022-04-22 | 重庆邮电大学 | Single-frequency microstrip filter antenna based on SIR |
| CN111883881B (en) * | 2020-08-04 | 2022-01-14 | 南京理工大学 | Continuous adjustable phase shifter based on multimode resonator |
| CN112803913B (en) * | 2020-12-30 | 2023-04-07 | 电子科技大学 | Reconfigurable filter with ultra-wide adjusting range |
| CN115412112B (en) * | 2022-07-12 | 2023-08-15 | 北京中科睿谱科技有限公司 | Frequency band, bandwidth adjustable differential transceiver |
| CN116454574B (en) * | 2023-06-20 | 2023-09-12 | 无锡频岢微电子有限公司 | Reconfigurable band-stop filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2625051B1 (en) * | 1987-12-18 | 1990-04-20 | Thomson Hybrides Microondes | DOUBLE FREQUENCY OSCILLATOR, TUNED BY VARACTORS |
| CN100583551C (en) * | 2003-01-24 | 2010-01-20 | 株式会社村田制作所 | Multimode dielectric resonator device, dielectric filter, composite dielectric filter, and communication device |
| US20110012696A1 (en) * | 2009-07-20 | 2011-01-20 | Sony Ericsson Mobile Communications Ab | Switched acoustic wave resonator for tunable filters |
| CN101894995B (en) * | 2010-05-19 | 2013-07-24 | 华南理工大学 | Radio frequency electrically adjusted band-pass filter with constant absolute bandwidth |
| CN203056060U (en) * | 2013-01-28 | 2013-07-10 | 南京理工大学 | Reconfigurable band-pass filter with wide bandwidth adjusting range and performance-controllable radio frequency |
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2013
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