CN105870553A - Reconfigurable substrate integrated waveguide bandpass filter and reconfigurable method of filter - Google Patents
Reconfigurable substrate integrated waveguide bandpass filter and reconfigurable method of filter Download PDFInfo
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- CN105870553A CN105870553A CN201610343899.6A CN201610343899A CN105870553A CN 105870553 A CN105870553 A CN 105870553A CN 201610343899 A CN201610343899 A CN 201610343899A CN 105870553 A CN105870553 A CN 105870553A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
Abstract
The invention discloses a reconfigurable substrate integrated waveguide bandpass filter and a reconfigurable method of the filter and mainly solves technical problems that the tuning range is small, the insertion loss of reconfigurable substrate integrated waveguide bandpass filters is high and control voltage of variable capacitance diodes cannot be directly applied to substrate integrated waveguides. One variable capacitance diode is placed in a non-metal via hole formed in the center of each of two complementary split-ring resonators of the bandpass filter, the metal part at an inner ring opening of each complementary split-ring resonator is replaced with a blocking capacitor, so that a substrate integrated waveguide is separated from an outer circuit, and a voltage source is prevented from being short-circuited; the variable capacitance diodes are connected with a direct-current bias circuit, reversed bias voltage at two ends of the variable capacitance diodes is adjusted, junction capacity of the variable capacitance diodes is changed, so that the resonant frequency of the two complementary split-ring resonators is affected, and the passband center frequency is reconfigurable. The feeding manner of the variable capacitance diodes in the substrate integrated waveguide is realized, the control manner is simple and easy to implement, the frequency tuning range is relatively large, the in-band insertion loss is low, and the filter can be applied to a wireless communication system.
Description
Technical field
The invention belongs to technical field of electronic devices, particularly to substrate integration wave-guide band filter, specifically a kind of
Restructural substrate integration wave-guide band filter and reconfigurable method thereof, for wireless communication system radio-frequency front-end.
Background technology
Along with development and the innovation of modern wireless communication systems, microwave and millimeter wave system towards miniaturization, high integration,
The direction of low cost develops rapidly.The waveguiding structure of low-loss, high quality factor and high power capacity, owing to it is excellent
Performance be widely used, but its size and volume are excessive, it is difficult to be applicable to miniaturization and integrated level high
Occasion；And although conventional microstrip structure radiation is relatively big, but owing to its size is little and processing is simple, it is possible to meet very
Many circuit are to volume and the requirement of integrated level.
In order to realize system, miniaturization and high performance requirement, substrate integration wave-guide are produced in this context and send out
Exhibition is got up.Substrate integrated wave guide structure is novel planar structure based on micro-strip medium substrate, and it has merged waveguide and micro-
The advantage of both band structures, has relatively Low emissivity, small size, high quality factor, the feature such as is easily integrated.In order to more
Realizing well the miniaturization of substrate integration wave-guide, it is integrated that Hong Wei professor and team thereof investigated half-module chip in 2005
Waveguide, this structure enables to original size and reduces almost half.
In the current era that wireless communication technology develops rapidly, frequency spectrum resource becomes the most rare.In order to improve frequency spectrum money
The utilization rate in source, many passbands, expand the spectrum technology such as frequency hopping and dynamic frequency allocation be widely applied, this is greatly facilitated
Electricity restructural or the development of fast electric tunable filter.Electrically tunable filter is short because of its tuning period, obtains in a communications system
Extensively applying, it plays the effect of rear class filtering before being in antenna in transmitters, and is in antenna in receivers
And as preselection filter between frequency mixer, its effect is to select useful signal from a large amount of frequency spectrums that antenna receives
Frequency, suppresses useless interfering frequency, and then improves the signal to noise ratio of receiver.
For tunable filter based on substrate integration wave-guide form, certain methods has been had to be suggested, root
According to " Marcelino Armendariz；Vikram Sekar；Kamran Entesari；Tunable siw band-pass
filters with PIN diodes,in Proc.40th Eur.Microw.Conf.,Sep.2010,pp.
830 833 " a kind of based on PIN diode the substrate integration wave-guide band filter proposed, control structure is complicated,
Tune relatively difficult, and carry interior Insertion Loss bigger.According to " Qiu Dong Huang；Yu Jian Cheng；
Ferrite-loaded Substrate Integrated Waveguide Frequency-Agile Bandpass
Filter, Advanced Materials and process for RF and THz Applications (IMWS-
AMP), 2015IEEE MTT-S International Microwave Workshop Series on, pp.1-3,2015 "
The one proposed is based on ferritic electricity adjustable substrate integration wave-guide band filter, and this wave filter can realize the company of passband
Continuous adjustable, but along with the increase of frequency, Insertion Loss substantially becomes big.
The restructural substrate integration wave-guide band filter being currently based on varactor form is the most fewer, and reason is base
The metal column of sheet integrated waveguide side makes the earth plate of substrate integration wave-guide directly connect with upper surface, such transfiguration two pole
The control voltage of pipe cannot be applied directly in substrate integration wave-guide.Existing method be varactor is connected on resonant ring with
Between metal floating capacitance, realize the regulation and control to resonant ring electric capacity by the capacity effect of metal floating capacitance, control knot
Structure is complicated and filter insertion loss is relatively big, and adjustable extent is less.
Summary of the invention
Present invention aim at the deficiency for above-mentioned prior art, it is provided that a kind of control structure is simple, adjustable extent big,
The restructural substrate integration wave-guide band filter that insertion loss is little.
The present invention is a kind of restructural substrate integration wave-guide band filter, including micro-strip medium substrate, micro-strip medium base
The bottom surface of plate is metal ground plate, and side, micro-strip medium substrate edge is provided with homogeneous metal via, upper surface of base plate pair
Claim is provided with resonant ring, collectively forms substrate integration wave-guide band filter, and wherein resonant ring is that two structures are identical
Complementary openings resonant ring, substrate is symmetrically arranged on two with feeder line, it is characterised in that: two resonant ring central authorities are respectively equipped with non-
Metallization via, is provided with varactor in non-metallic via, and two varactor negative poles are coupled with substrate
In the metal part of two resonant ring central authorities of integrated waveguide, two choke inductions are connected with two varactor negative poles respectively
Composition parallel branch, is connected on again current-limiting resistance one end after parallel connection, the current-limiting resistance other end is source-series with DC voltage；
Two choke inductions, current-limiting resistance constitute DC bias circuit with direct voltage source；The positive pole of two varactors receives base
On the metal ground plate of sheet integrated waveguide；The metal part of resonant ring internal ring opening part replaces with a capacitance；Pass through
Regulation is carried in the size of varactor two ends reversed bias voltage and realizes the restructural of substrate integration wave-guide band filter.
The present invention or the reconfigurable method of a kind of substrate integration wave-guide bandpass filtering, it is characterised in that at restructural base
Realize on sheet integrated waveguide band filter, the restructural process of substrate integration wave-guide band filter, include as follows
Step:
Step 1: punch on the substrate of substrate integration wave-guide band filter, install and weld varactor
Have non-metallic via in two complementary openings resonant ring central authorities, put into varactor in the vias,
The negative pole of two varactors is coupled with in the metal part of substrate integration wave-guide two resonant ring central authorities, and two positive poles are respectively
Receive on the metal ground plate of substrate integration wave-guide；
Step 2: install capacitance
Placing a capacitance respectively at two resonant ring internal ring opening parts, the capacitance of two capacitances is equal, its
Physical dimension matches with the width of resonant ring, and capacitance one end is received on the metal between resonant ring inner and outer ring, separately
One end is received on the metal within resonant ring, and this capacitance makes substrate integration wave-guide separate with external circuit, works as direct current
When voltage is added to varactor two ends, does not results in direct voltage source short circuit, avoid external voltage to pass through substrate collection simultaneously
Become waveguide to enter vector network analyzer and burn out measuring instrument；
Step 3: complete the connection of DC bias circuit, generally forms restructural substrate integration wave-guide band filter
Two varactor negative poles are welded to form parallel branch with two choke inductions respectively, and this two parallel branch is welded to limit
One end of leakage resistance, the other end of current-limiting resistance is connected with the positive pole of direct voltage source, the negative pole welding of direct voltage source
On the metal ground plate of substrate integration wave-guide；
Step 4: realize the restructural of substrate integration wave-guide band filter by changing DC voltage
4.1 regulation direct voltage sources, change the size of direct voltage source voltage；
The change of 4.2 direct voltage source voltages, causes the change of junction capacity on varactor, the electricity that varactor produces
Hold effect and directly affect the field distribution of resonant ring, change the resonant frequency of resonant ring, and then change in filter passband
Frequency of heart；
4.3 exist from 0V to 30V consecutive variations, corresponding passband central frequency when the size of direct voltage source
Consecutive variations in the range of 1.9GHz-2.5GHz；
4.4 regulation direct voltage sources, it is achieved the restructural of substrate integration wave-guide band filter.
The invention have the advantages that
1. due to the fact that and have non-metallic via in resonant ring central authorities, in order to place varactor, by changing
Becoming the size of reversed bias voltage being carried in varactor two ends, the capacity effect that therefore varactor produces can direct shadow
Ring the field distribution situation in resonant ring, change the resonant frequency of resonant ring, it is achieved the restructural of passband central frequency.
2. due to the fact that and replace with a capacitance at resonant ring ring gap so that when DC offset voltage adds
Do not result in the short circuit of DC source during to the two ends of varactor, simultaneously this capacitance make substrate integration wave-guide with
External circuit is separated, it is to avoid external voltage enters vector network analyzer by substrate integration wave-guide and burns out measuring instrument.
3. due to the fact that and have a non-metallic via in resonant ring central authorities, and at resonant ring ring gap with one every directly
Electric capacity replaces, and the control voltage solving varactor cannot be applied directly to the technical problem in substrate integration wave-guide,
Achieve the feeding classification that varactor is inserted in substrate integration wave-guide, and the method is simple.
4. the present invention can carry out adaptive impovement according to the actual requirements, by changing the length of resonant ring, transfiguration two pole
The model of pipe regulates the working frequency range of wave filter, thus meets different application demands, designs simple and flexible.
5. present invention employs half module substrate integrated wave guide structure, make the size of wave filter reduce half, simultaneously at substrate
The complementary openings resonant ring loaded on integrated waveguide, can produce resistance when higher than substrate integration wave-guide cut-off frequency resonance
Band, thus form band filter, filter size reduces the most further.
Accompanying drawing explanation
Fig. 1 is the tomograph of the present invention；
Fig. 2 is the construction profile of Fig. 1；
Fig. 3 is the Facad structure figure of Fig. 1；
Fig. 4 is the chart at the bottom of of Fig. 1；
Fig. 5 is the insertion loss S21 curve chart in the specific embodiment of the invention 9 and embodiment 10；
Fig. 6 is the return loss S11 curve chart in the specific embodiment of the invention 9 and embodiment 10.
Detailed description of the invention
Below in conjunction with the accompanying drawings embodiments of the invention are elaborated:
Embodiment 1
At present, band filter based on substrate integration wave-guide form, major part is to etch not similar shape on the surface of the substrate
The resonant ring of shape, although structure is simple, but is not suitable for the occasion of multiband.In order to be applied to the occasion of multiband,
Needing to design the wave filter of multiple different frequency bands, comparison between projects is complicated, not only causes the waste of design and resource, also deposits
In the inconvenience used and temporal delay, need to process the RF front-end circuit of multi-band signal now, need badly
A kind of restructural substrate integration wave-guide band filter.
Varactor is a kind of adjustable device being relatively low cost and easy to and controlling, the most most based on transfiguration two pole
The microwave tunable filter of form of tubes all realizes in micro-strip, restructural substrate collection based on varactor form
Becoming waveguide bandpass filter the most fewer, reason is that the metal column of substrate integration wave-guide side makes connecing of substrate integration wave-guide
Floor directly connects with upper surface, and the control voltage of such varactor cannot be applied directly in substrate integration wave-guide,
Otherwise can cause the short circuit of power supply when varactor is received on DC bias circuit, the most above-mentioned limitation limits
Varactor application in substrate integration wave-guide.
For the present Research of prior art, the present invention proposes a kind of restructural substrate integration wave-guide band filter, ginseng
Seeing Fig. 1, including micro-strip medium substrate 1, the bottom surface of micro-strip medium substrate 1 is metal ground plate 2, micro-strip medium substrate
Side, edge is provided with homogeneous metal via 3, and what upper surface of base plate was symmetrical is provided with resonant ring 4, collectively forms substrate collection
Becoming waveguide bandpass filter, wherein resonant ring is the complementary openings resonant ring that two structures are identical, and the composition of ring is to print
Making sheet is formed by etching, and substrate is symmetrically arranged on two with feeder line 5, is connected to vector network analysis by sub-miniature A connector
On carry out the measurement of device, but existing substrate integration wave-guide band filter is the most reconfigurable.The present invention is two
Individual resonant ring central authorities are respectively equipped with non-metallic via 6, see Fig. 4.Varactor 7 is arranged on this non-metallic
In via 6, the positive pole being installed on two varactors in non-metallic via 6 receives the gold of substrate integration wave-guide
Belong on earth plate, i.e. ground connection；The negative pole of two varactors receives the upper surface of substrate integration wave-guide, i.e. substrate collection
Becoming in the metal part at two resonant ring 4 medium pore edges of waveguide, the negative pole of two varactors is electric with two chokes again
Sense 83 is connected, and forms parallel branch, is connected on again current-limiting resistance 82 one end, current limliting electricity after this two parallel branches parallel connection
The other end of resistance 82 is connected with direct voltage source 81.Two choke inductions 83, current-limiting resistance 82 and direct voltage source 81
Constitute DC bias circuit 8, see Fig. 2.The negative pole of direct voltage source 81 receives the metal ground plate of substrate integration wave-guide
On 2；The metal part of resonant ring internal ring opening part replaces with a capacitance 9, and the present invention is in order to install capacitance
The metal partial etching of resonant ring internal ring opening part is fallen by 9, replaces with capacitance 9.Capacitance in the present invention
Size can affect the coupling between two resonant rings, through substantial amounts of experiment and simulation analysis, The present invention gives every straight electricity
The capacitance held is selected in 1pF-10pF, and in this range, in filter passband, ripple is less, and passband is more flat
Smooth and bandwidth is bigger.In this example, the capacitance of capacitance is 4.7pF, and the distance between two resonant rings is 12.9mm.
It is carried in varactor two ends by regulation in the restructural substrate integration wave-guide band filter of the present invention
The size of reversed bias voltage realizes the restructural of substrate integration wave-guide band filter.
The present invention is directed to need badly the technical need of a kind of restructural substrate integration wave-guide band filter, utilize innovation to think
Dimension, has non-metallic via in resonant ring central authorities and puts varactor into, solves the control electricity of varactor
Pressure cannot be applied directly to the technical problem in substrate integration wave-guide.The present invention is carried in varactor two ends by change
The size of reversed bias voltage, the capacity effect that varactor produces can directly affect the field distribution in resonant ring, change humorous
Shake the resonant frequency of ring, it is achieved the restructural of passband central frequency；Present invention achieves varactor and directly insert base
Feeding classification in sheet integrated waveguide, control structure is simple, it is not necessary to by increasing other substrate or circuit, it is achieved
Mode is simple；The present invention additionally uses half module substrate integrated wave guide structure, makes the size of wave filter reduce half；
Owing to loading complementary openings resonant ring at substrate surface, this resonant ring can be higher than substrate integration wave-guide cut-off frequency resonance
Time produce stopband, thus form band filter, filter size reduces the most further.
Embodiment 2
The overall of restructural substrate integration wave-guide band filter is constituted with construction features with embodiment 1, resonant ring central authorities
The non-metallic via arranged, the diameter of via matches with being placed in the physical dimension of varactor in via, via
Surplus between diameter and the physical dimension of varactor is 0.1mm, it is ensured that varactor is easy to integrated with substrate
The metal level welding of waveguide, it is ensured that varactor stability in the vias；The diameter of the most non-metallic via is not
Can be excessive, otherwise can affect the seriality of field in substrate integration wave-guide, filtering performance is deteriorated, transfiguration two pole in this example
The model of pipe is SMV1405.
Embodiment 3
The overall of restructural substrate integration wave-guide band filter is constituted with construction features with embodiment 1-2, sees Fig. 1
And Fig. 3, the present invention installs a capacitance 9 at resonant ring internal ring opening part, and capacitance one end is received in resonant ring
On sheet metal between outer shroud, the other end is received on the sheet metal within resonant ring.The width of two resonant ring inner and outer rings
Identical, its width matches with the physical dimension of capacitance, makes capacitance just can be connected across on internal ring, it is ensured that
The safe and reliable work of restructural substrate integration wave-guide band filter.The placement of capacitance 9 enables DC voltage
It is added to the two ends of varactor, does not results in the short circuit of direct voltage source, make substrate integration wave-guide and external circuit simultaneously
Separate, it is to avoid external voltage enters vector network analyzer by substrate integration wave-guide and burns out measuring instrument.
The present invention has also drawn the optimal distance between optimal capacitance value and two resonant rings of two capacitances, every
The optimal capacitance value of straight electric capacity is 2.2pF, and the optimal distance between two resonant rings is 12.5mm.
Embodiment 4
The overall of restructural substrate integration wave-guide band filter is constituted with construction features with embodiment 1-3, sees Fig. 1
And Fig. 3, in the present invention, between distance joint effect two resonant ring between size and two resonant rings of capacitance
Coupling, the capacitance of this capacitance is selected in 1pF-10pF；When the capacitance variation of capacitance, two is humorous
The distance between ring of shaking also will be along with adjustment, and the value of capacitance is the biggest, and the distance between two resonant rings is the biggest, away from
From specifically optimized choice in 11.8mm-13.5mm, it is ensured that wave filter normally works.
Owing in the present invention, distance between size and two resonant rings of capacitance can affect the coupling between two resonant rings
Close, and then affect the flatness of filter bandwidht.Capacitance value in substantial amounts of experiment and simulation analysis, this example
For 1pF, the corresponding distance between resonant ring is 11.8mm.
Embodiment 5
The overall of restructural substrate integration wave-guide band filter is constituted with construction features with embodiment 1-4, sees Fig. 1
And Fig. 3, in order to ensure the flatness of filter passband and reduce the insertion loss of wave filter, two capacitances
Capacitance is equal, and its technical parameter requires higher precision.
In the present invention, the distance between size and two resonant rings of capacitance all can affect the coupling between two resonant rings,
And then affect the flatness of filter bandwidht.In substantial amounts of experiment and simulation analysis, this example, capacitance value is
10pF, the distance between two resonant rings is 13.5mm.
Embodiment 6
The present invention or the reconfigurable method of a kind of substrate integration wave-guide band filter, at any of the above-described restructural substrate
Realizing on integrated waveguide band filter, the overall of restructural substrate integration wave-guide band filter is constituted and construction features
With embodiment 1-5, the restructural process of substrate integration wave-guide band filter, comprise the following steps that
Step 1: punch on the substrate of substrate integration wave-guide band filter, install and weld varactor
Have non-metallic via in two complementary openings resonant ring central authorities, put into varactor in the vias,
The negative pole of two varactors is coupled with in the metal part of the centre of substrate integration wave-guide resonant ring, and two positive poles connect respectively
On the metal ground plate of substrate integration wave-guide；Via diameter is mated with varactor structure size so that transfiguration
Diode is easy to weld with substrate integration wave-guide, it is ensured that the stability of wave filter.
Step 2: install capacitance
Placing a capacitance respectively at two resonant ring internal ring opening parts, the capacitance of two capacitances is equal, its
Physical dimension matches with the width of resonant ring, and capacitance one end is received on the metal between resonant ring inner and outer ring, separately
One end is received on the metal within resonant ring, makes substrate integration wave-guide separate with external circuit, when DC voltage is loaded into
During varactor two ends, do not result in direct voltage source short circuit, avoid external voltage to be entered by substrate integration wave-guide simultaneously
Enter vector network analyzer and burn out measuring instrument.Seeing Fig. 1, in the present invention, the capacitance size of capacitance is humorous with two
Shake the coupling between distance joint effect two resonant ring between ring, when the capacitance variation of capacitance, two resonant rings
Between distance also to adjust therewith, make wave filter be operated in optimum state, the direct current of capacitance and band filter
Biasing circuit is without connecting；
Step 3: complete the connection of DC bias circuit, generally forms restructural substrate integration wave-guide band filter
Two varactor negative poles are welded to form parallel branch with two choke inductions respectively, and this two parallel branch is welded to limit
One end of leakage resistance 82, the other end of current-limiting resistance 82 is connected with the positive pole of direct voltage source 81, direct voltage source
The negative pole of 81 is welded on the metal ground plate of substrate integration wave-guide；
Step 4: realize the restructural of substrate integration wave-guide band filter by changing DC voltage
4.1 regulation direct voltage sources 81, change the size of direct voltage source voltage；
4.2 pass through software emulation, when loading the substrate integration wave-guide band filter resonance that complementary openings resonant ring is constituted
Time, the electric field in substrate integration wave-guide is mainly distributed in resonant ring, the change of direct voltage source 81 voltage, causes
The change of junction capacity on varactor, the capacity effect that varactor produces directly affects the field distribution of resonant ring, changes
The resonant frequency of resonant ring, and then change the mid frequency of filter passband；
4.3 exist from 0V to 30V consecutive variations, corresponding passband central frequency when the size of direct voltage source
Consecutive variations in the range of 1.9GHz-2.5GHz；
4.4 regulation direct voltage sources 81, it is achieved the restructural of substrate integration wave-guide band filter.
Due to the fact that and have non-metallic via in resonant ring central authorities, and place a varactor in the vias, solve
The technical problem that varactor of having determined cannot directly be inserted in substrate integration wave-guide；Metal at resonant ring ring gap
Part is with a capacitance replacement, it is to avoid the short circuit of direct voltage source, it is achieved that it is integrated that varactor inserts substrate
Feeding classification in waveguide, control mode is simple, and the method is simple.
Embodiment 7
The reconfigurable method of substrate integration wave-guide band filter is with embodiment 6, in step 4, when the electricity of direct voltage source
When pressure is for 0V, corresponding filter passband mid frequency is 1.9GHz；When voltage is 4.7V, corresponding wave filter
Passband central frequency is 2.2GHz；When voltage is 30V, corresponding filter passband mid frequency is 2.5GHz.
Embodiment 8
The reconfigurable method of substrate integration wave-guide band filter is with embodiment 6, restructural substrate integration wave-guide bandpass filtering
The overall of device is constituted with construction features with embodiment 1-5, in conjunction with below by restructural substrate integration wave-guide band filter
And reconfigurable method combines together and makees an example explanation.
Seeing Fig. 1 and Fig. 3, the present invention is mainly by micro-strip medium substrate 1, metal ground plate 2, micro-strip medium substrate side
Homogeneous metal via 3, complementary openings resonant ring 4, feeder line 5, split ring resonator central authorities non-metallic via 6,
Varactor 7 in non-metallic via, DC circuit 8, capacitance 9 forms.Wherein:
Micro-strip medium substrate 1 uses the two-sided silver plate that covers, and two-sided covering below silver plate is metal ground plate 2, at micro-strip medium
Side, substrate 1 edge is provided with metallization via 3, sees Fig. 4, forms half module substrate integrated wave guide structure；Feeder line 5 is right
Claim is distributed on the metallic plate of upper strata, is received the measurement carrying out device on vector network analyzer by sub-miniature A connector；
The two-sided above symmetry covering silver plate be provided with two identical complementary openings resonant rings 4, above structure form substrate collection
Become waveguide bandpass filter；It is provided with non-metallic via 6 in resonant ring central authorities, two vias are placed one respectively
Varactor 7, the diameter of via matches with being placed in the physical dimension of varactor in via, makes transfiguration two pole
Pipe is just put in non-metallic via, it is ensured that the metal level that varactor is easy to substrate integration wave-guide welds, and protects
Card varactor stability in the vias；The diameter of the most non-metallic via can not be excessive, otherwise can affect base
The seriality of the field in sheet integrated waveguide, filtering performance is deteriorated.Seeing Fig. 2, the negative pole of two varactors connects respectively
To substrate integration wave-guide resonant ring central authorities metal part on, two choke inductions 83 respectively with two varactors
Negative pole is connected to form parallel branch, is connected on again current-limiting resistance 82 one end after parallel connection, and current-limiting resistance 82 other end is with straight
Stream voltage source 81 is connected, and the positive pole of two varactors receives substrate integration wave-guide together with the negative pole of direct voltage source
On metal ground plate 2.
The internal ring opening of the complementary openings resonant ring being carried on substrate integration wave-guide is equivalent to an electric capacity, in order to realize
Varactor feeding classification in substrate integration wave-guide, the present invention is at the metal of the two resonant ring internal ring opening part
Replace with a capacitance 9 respectively at Bu Fen, see Fig. 1 and Fig. 3；In order to install capacitance 9, by resonant ring
The metal partial etching of ring opening part falls, and replaces with capacitance 9, and two capacitances make substrate integration wave-guide and dispatch from foreign news agency
Road is separated, and does not results in direct voltage source short circuit when DC voltage is carried in diode two ends, avoids dispatch from foreign news agency simultaneously
Press and burn out measuring instrument by substrate integration wave-guide entrance vector network analyzer.The capacitance size of capacitance 9 with
The coupling between distance joint effect two resonant ring between two resonant rings, when the capacitance variation of capacitance 9, two
Distance between resonant ring also to adjust therewith, makes wave filter be operated in optimum state.Obtain through substantial amounts of simulation analysis
Going out, show that the optimal value of capacitance is 2.2pF, the optimal distance between two resonant rings is 12.5mm.
The width of two resonant ring inner and outer rings is identical, and in this example, inner and outer ring width is 0.6mm, two resonant ring inner and outer rings
The physical dimension of width and capacitance match, it is ensured that the safety of restructural substrate integration wave-guide band filter can
By work.In order to ensure the flatness of filter passband, the capacitance of two capacitances 9 is equal, its technical parameter
Require higher precision.
By emulation, when loading the substrate integration wave-guide band filter resonance that complementary openings resonant ring is constituted, substrate
Electric field in integrated waveguide is mainly distributed in resonant ring, therefore by changing the big of reversed bias voltage on varactor 7
Little, the capacity effect that varactor 7 produces can directly affect the field distribution of resonant ring, changes the resonance frequency of resonant ring
Rate, and then change the mid frequency of filter passband, it is achieved the restructural of substrate integration wave-guide band filter.
The effect of the present invention can be further illustrated by emulation and test:
Embodiment 9
The reconfigurable method of substrate integration wave-guide band filter leads to embodiment 6-8, restructural substrate integration wave-guide band
The overall of wave filter is constituted with construction features with embodiment 1-5.
Set relative dielectric constant εr=2.2, dielectric-slab thickness is 0.8mm, and feeder line width 2.5mm is soft in Electromagnetic Simulation
Part HFSS has carried out emulation and has utilized vector network measuring instrument N5230A to be tested material object wave filter, obtains
Insertion loss curve S21 such as Fig. 5 and return loss plot S11 such as Fig. 6 of wave filter.
When the voltage of direct voltage source 81 changes in the range of 0V-30V, filter passband of the present invention arrives at 1.9GHz
2.5GHz continuously adjustabe.In order to the brightest, the present embodiment is chosen 3 points and is explained, respectively 1.9GHz,
2.2GHz, 2.5GHZ, be shown in Fig. 5, from the insertion loss S21 of restructural substrate integration wave-guide band filter of the present invention
It can be seen that filter passband is at 1.9GHz to 2.5GHz continuously adjustabe, tuning range is bigger.3 chosen in figure
The response curve of point shows: in band, maximum Insertion Loss is respectively less than 2dB, and band is outer has a transmission zero, Out-of-band rejection
Preferably.
The present invention can carry out adaptive impovement according to the actual requirements, by changing the length of resonant ring, varactor
Model regulates the working frequency range of wave filter, thus meets different application demands, designs simple and flexible.
Embodiment 10
The reconfigurable method of substrate integration wave-guide band filter leads to embodiment 6-9, restructural substrate integration wave-guide band
The overall of wave filter is constituted with construction features with embodiment 1-5.
Return loss plot S 11 of the present invention is shown in that choosing 3 points in Fig. 6, this example equally is explained, i.e.
1.9GHz, 2.2GHz, 2.5GHZ, by three points chosen in figure it can be seen that this wave filter is in working frequency range
Return loss be all higher than 15dB, filtering performance is preferable.
By Fig. 5 with Fig. 6 it can be seen that simulation result is consistent with measured result.
In sum, a kind of restructural substrate integration wave-guide band filter disclosed by the invention and reconfigurable method thereof,
Mainly solution tuning range is little, restructural substrate integration wave-guide band filter insertion loss big, the control of varactor
Voltage processed cannot be applied directly to the technical problem in substrate integration wave-guide.This wave filter includes micro-strip medium substrate 1, gold
Belong to earth plate 2, the homogeneous metal via 3 of micro-strip medium substrate side, two symmetrical complementary openings resonance
Ring 4, feeder line 5, the non-metallic via 6 of resonant ring central authorities, the varactor 7 in non-metallic via, transfiguration
Diode 7 is connected with DC bias circuit 8, capacitance 9.It it is critical only that and divides in two non-metallic vias
Not putting into a varactor, the metal part of complementary openings resonant ring internal ring opening part replaces with a capacitance,
Be added in the size of the reversed bias voltage at varactor two ends by change, the capacity effect that varactor produces can direct shadow
Ring the field distribution situation in resonant ring, change the resonant frequency of resonant ring, it is achieved the restructural of passband central frequency.This
Invention achieves varactor feeding classification in substrate integration wave-guide, and control mode is simple, frequency tuning
Scope is relatively big, in-band insertion loss is less, can be used for wireless communication system.
Above-mentioned example is a part of embodiment of the present invention rather than whole embodiments.Based on the reality in the present invention
Execute example, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise,
Broadly fall into the scope of protection of the invention.
Claims (7)
1. a restructural substrate integration wave-guide band filter, including micro-strip medium substrate (1), micro-strip medium substrate (1)
Bottom surface is metal ground plate (2), and side, micro-strip medium substrate edge is provided with homogeneous metal via (3), upper surface of base plate
Symmetrical is provided with resonant ring (4), collectively forms substrate integration wave-guide band filter, and wherein resonant ring is two structure phases
Same complementary openings resonant ring, substrate is symmetrically arranged on two with feeder line (5), it is characterised in that: two resonant ring central authorities are respectively
Being provided with non-metallic via (6), be provided with varactor (7) in non-metallic via (6), two varactors are born
Pole is coupled with in the metal part of two resonant rings (4) central authorities of substrate integration wave-guide, two choke inductions (83) respectively with
Two varactor negative poles are connected to form parallel branch, are connected on again current-limiting resistance (82) one end, current-limiting resistance after parallel connection
(82) other end is connected with direct voltage source (81)；Two choke inductions (83), current-limiting resistance (82) and direct voltage source (81)
Constitute DC bias circuit (8)；The positive pole of two varactors is received on the metal ground plate (2) of substrate integration wave-guide；
The metal part of resonant ring internal ring opening part one capacitance (9) replaces；It is carried in varactor two ends by regulation
The size of reversed bias voltage realizes the restructural of substrate integration wave-guide band filter.
A kind of restructural substrate integration wave-guide band filter the most according to claim 1, it is characterised in that described humorous
Shake the non-metallic via that ring central authorities arrange, the diameter of via and be placed in the physical dimension of varactor in via mutually
Join.
A kind of restructural substrate integration wave-guide band filter the most according to claim 1, it is characterised in that resonant ring
The metal part of internal ring opening part replaces with a capacitance, and capacitance one end receives the gold between resonant ring inner and outer ring
On genus, the other end is received on the metal within resonant ring, and the width of two resonant ring inner and outer rings is identical, its width with every
The physical dimension of straight electric capacity matches.
A kind of restructural substrate integration wave-guide band filter the most according to claim 1, it is characterised in that should be every directly
The capacitance of electric capacity is selected in 1pF-10pF；When the capacitance variation of capacitance, between two resonant rings away from
From also will be along with adjustment, the value of capacitance be the biggest, and the distance between two resonant rings is the biggest, and distance specifically exists
11.8mm-13.5mm middle optimized choice, wave filter is made normally to work.
A kind of restructural substrate integration wave-guide band filter the most according to claim 3, it is characterised in that every straight electricity
The optimal capacitance value held is 2.2pF.
6. the reconfigurable method of a substrate integration wave-guide band filter, it is characterised in that in the arbitrary institute of claim 1-5
Realize on the restructural substrate integration wave-guide band filter stated, the restructural mistake of substrate integration wave-guide band filter
Journey, comprises the following steps that
Step 1: punch on the substrate of substrate integration wave-guide band filter, install and weld varactor
Have non-metallic via in two complementary openings resonant ring central authorities, put into varactor in the vias,
The negative pole of two varactors is coupled with in the metal part of substrate integration wave-guide two resonant ring central authorities, and two positive poles are respectively
Receive on the metal ground plate of substrate integration wave-guide；
Step 2: install capacitance
Placing a capacitance respectively at two resonant ring internal ring opening parts, the capacitance of two capacitances is equal, its
Physical dimension matches with the width of resonant ring, and capacitance one end is received on the metal between resonant ring inner and outer ring, separately
One end is received on the metal within resonant ring, and this capacitance makes substrate integration wave-guide separate with external circuit, works as direct current
When voltage is added to varactor two ends, does not results in direct voltage source short circuit, avoid external voltage to pass through substrate collection simultaneously
Become waveguide to enter vector network analyzer and burn out measuring instrument；
Step 3: complete the connection of DC bias circuit, generally forms restructural substrate integration wave-guide band filter
Two varactor negative poles are welded to form parallel branch with two choke inductions respectively, and this two parallel branch is welded to limit
One end of leakage resistance (82), the other end of current-limiting resistance (82) is connected with the positive pole of direct voltage source (81), direct voltage source
(81) negative pole is welded on the metal ground plate of substrate integration wave-guide；
Step 4: realize the restructural of substrate integration wave-guide band filter by changing DC voltage
4.1 regulations direct voltage source (81), change the size of direct voltage source (81) voltage；
The change of 4.2 direct voltage sources (81) voltage, causes the change of junction capacity on varactor, and varactor produces
Capacity effect directly affect the field distribution of resonant ring, change the resonant frequency of resonant ring, and then change filter passband
Mid frequency；
4.3 exist from 0V to 30V consecutive variations, corresponding passband central frequency when the size of direct voltage source
Consecutive variations in the range of 1.9GHz-2.5GHz；
4.4 regulations direct voltage source (81), it is achieved the restructural of substrate integration wave-guide band filter.
The reconfigurable method of a kind of restructural substrate integration wave-guide band filter the most according to claim 6, its feature
Being, in step 4, when the voltage of direct voltage source is 0V, corresponding filter passband mid frequency is 1.9GHz；
When voltage is 4.7V, corresponding filter passband mid frequency is 2.2GHz；When voltage is 30V, corresponding
Filter passband mid frequency is 2.5GHz.
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| CN107546451A (en) * | 2017-07-18 | 2018-01-05 | 电子科技大学 | Electrically tunable filter based on regular hexagon half module substrate integrated wave guide and CSR structures |
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