CN105870553B - A kind of restructural substrate integration wave-guide bandpass filter and its reconfigurable method - Google Patents
A kind of restructural substrate integration wave-guide bandpass filter and its reconfigurable method Download PDFInfo
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- CN105870553B CN105870553B CN201610343899.6A CN201610343899A CN105870553B CN 105870553 B CN105870553 B CN 105870553B CN 201610343899 A CN201610343899 A CN 201610343899A CN 105870553 B CN105870553 B CN 105870553B
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- 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
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- H01P1/203—Strip line filters
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Abstract
The invention discloses a kind of restructural substrate integration wave-guide bandpass filter and its reconfigurable methods, and mainly solution tuning range is small, restructural substrate integration wave-guide bandpass filter Insertion Loss is big, varactor control voltage can not be applied directly to the technical problem in substrate integration wave-guide.The present invention puts a varactor in the non-metallic via hole that two complementary openings resonant ring center of bandpass filter is provided with respectively, the metal part of resonant ring inner ring opening is replaced with a capacitance, it separates substrate integration wave-guide with external circuit, avoids voltage source short-circuit；Varactor connects DC bias circuit, adjusts the reversed bias voltage at varactor both ends, changes the junction capacity of varactor, to influence the resonance frequency of two resonant rings, realizes the restructural of passband central frequency.The present invention realizes feeding classification of the varactor in substrate integration wave-guide, and control mode is simple and easy, and frequency tuning range is larger, in-band insertion loss is small, can be used for wireless communication system.
Description
Technical field
It is specifically a kind of the invention belongs to technical field of electronic devices, in particular to substrate integration wave-guide bandpass filter
Restructural substrate integration wave-guide bandpass filter and its reconfigurable method are used for wireless communication system radio-frequency front-end.
Background technique
With the development and innovation of modern wireless communication systems, microwave and millimeter wave system is towards miniaturization, high integration, low
The direction of cost rapidly develops.Low-loss, high quality factor and high power capacity waveguiding structure, since its excellent performance obtains
To being widely applied, however its size and volume are excessive, it is difficult to suitable for the occasion high to miniaturization and integrated level；And it is traditional
Although microstrip structure radiation is larger, since its size is small and the processing is simple, it can satisfy many circuits to volume and integrate
The requirement of degree.
In order to realize system to miniaturization and high performance requirement, substrate integration wave-guide is generated and is sent out in this context
Exhibition is got up.Substrate integrated wave guide structure is the novel planar structure based on microstrip dielectric substrate, it has merged waveguide and micro-strip knot
The advantages of both structures, has the characteristics that compared with Low emissivity, small size, high quality factor, is easily integrated.In order to which substrate is better achieved
The miniaturization of integrated waveguide, Hong Wei professor and its team had investigated half module substrate integrated wave guide, this structure energy in 2005
Enough so that original size reduces almost half.
In the current era that wireless communication technique rapidly develops, frequency spectrum resource becomes more rare.In order to improve frequency spectrum money
The utilization rate in source, multi-pass band, the expansion spectrum technologies such as frequency hopping and dynamic frequency allocation are widely applied, this is greatly facilitated electricity and can weigh
The development of structure or quick electrically tunable filter.Electrically tunable filter is used widely in a communications system because its tuning period is short, it
Play the role of rear class filtering before antenna in transmitters, and is in conduct between antenna and frequency mixer in receivers
Preselection filter, effect is to select useful signal frequency from a large amount of frequency spectrums that antenna receives, and inhibits useless interference
Frequency, and then improve the signal-to-noise ratio of receiver.
For the tunable filter based on substrate integration wave-guide form, there are certain methods to be suggested at present, 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 " institute
A kind of substrate integration wave-guide bandpass filter of the PIN-based diode proposed, control structure is complicated, and tuning is relatively difficult, and
And it is bigger with interior Insertion Loss.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
One kind that Microwave Workshop Series on, pp.1-3,2015 " are proposed is integrated based on the ferritic adjustable substrate of electricity
Waveguide bandpass filter, the filter are able to achieve the continuously adjustable of passband, but with the increase of frequency, Insertion Loss obviously becomes larger.
It is also fewer currently based on the restructural substrate integration wave-guide bandpass filter of varactor form, the reason is that base
The metal column of piece integrated waveguide side is connected to the earth plate of substrate integration wave-guide directly with upper surface, such varactor
Control voltage can not be applied directly in substrate integration wave-guide.Existing method is to connect varactor to float in resonant ring and metal
Between capacitor, the regulation to resonance ring capacitance is realized by the capacity effect of metal floating capacitance, control structure is complicated and filters
Wave device insertion loss is larger, and adjustable extent is smaller.
Summary of the invention
Present invention aims at the deficiency for being directed to above-mentioned prior art, provide a kind of control structure is simple, adjustable extent is big,
The small restructural substrate integration wave-guide bandpass filter of insertion loss.
The present invention is a kind of restructural substrate integration wave-guide bandpass filter, including microstrip dielectric substrate, micro-strip medium base
The bottom surface of plate is metal ground plate, and microstrip dielectric substrate edge side is equipped with homogeneous metal via hole, and upper surface of base plate is symmetrical
Equipped with resonant ring, substrate integration wave-guide bandpass filter is collectively formed, wherein resonant ring is the identical complementary openings of two structures
Resonant ring, substrate two sides are symmetrically arranged with feeder line, it is characterised in that: and two resonant ring centers are respectively equipped with non-metallic via hole,
Varactor is installed, two varactor cathode are coupled with two resonance of substrate integration wave-guide in non-metallic via hole
In the metal part in ring center, two choke inductions are connected to form parallel branch with two varactor cathode respectively, after parallel connection again
It is connected on current-limiting resistance one end, the current-limiting resistance other end and DC voltage are source-series；Two choke inductions, current-limiting resistance and direct current
Potential source constitutes DC bias circuit；The anode of two varactors is connected on the metal ground plate of substrate integration wave-guide；Resonant ring
The metal part of inner ring opening is replaced with a capacitance；By adjusting load in the big of varactor both ends reversed bias voltage
It is small to realize the restructural of substrate integration wave-guide bandpass filter.
The present invention or a kind of reconfigurable method of substrate integration wave-guide bandpass filtering, which is characterized in that in restructural base
It is realized on piece integrated waveguide bandpass filter, the restructural process of substrate integration wave-guide bandpass filter comprises the following steps that
Step 1: being punched on the substrate of substrate integration wave-guide bandpass filter, install and weld varactor
Non-metallic via hole is had in two complementary openings resonant ring centers, is put into varactor in the vias,
The cathode of two varactors is coupled in the metal part in two resonant ring of substrate integration wave-guide center, and two anodes are coupled with
On the metal ground plate of substrate integration wave-guide；
Step 2: installation capacitance
A capacitance is placed respectively in two resonant ring inner ring openings, the capacitance of two capacitances is equal,
The width of structure size and resonant ring matches, and one end of capacitance is connected on the metal between resonant ring inner and outer ring, the other end
It is connected on the metal inside resonant ring, which separate substrate integration wave-guide with external circuit, when DC voltage is added to
When varactor both ends, DC voltage source short circuit not will cause, while external voltage being avoided to enter arrow by substrate integration wave-guide
Amount Network Analyzer burns out measuring instrument；
Step 3: completing the connection of DC bias circuit, generally form restructural substrate integration wave-guide bandpass filter
Two varactor cathode are welded to form parallel branch with two choke inductions respectively, which is welded to limit
One end of leakage resistance, the other end of current-limiting resistance are connected with the anode of DC voltage source, and the cathode of DC voltage source is welded to base
On the metal ground plate of piece integrated waveguide；
Step 4: realizing the restructural of substrate integration wave-guide bandpass filter by changing DC voltage
4.1 adjust DC voltage source, change the size of DC voltage source voltage；
The change of 4.2 DC voltage source voltages causes the change of junction capacity on varactor, the capacitor that varactor generates
Effect directly affects the field distribution of resonant ring, changes the resonance frequency of resonant ring, and then change the centre frequency of filter passband；
4.3 when DC voltage source size from 0V to 30V consecutive variations, corresponding passband central frequency is in 1.9GHz-
Consecutive variations within the scope of 2.5GHz；
4.4 adjust DC voltage source, realize the restructural of substrate integration wave-guide bandpass filter.
The invention has the following advantages that
1. the present invention, to place varactor, passes through change due to being provided with non-metallic via hole in resonant ring center
The size in the reversed bias voltage at varactor both ends is loaded, therefore the capacity effect that varactor generates can directly affect resonance
Field distribution situation in ring, changes the resonance frequency of resonant ring, realizes the restructural of passband central frequency.
2. the present invention at resonant ring ring gap with a capacitance due to being replaced, so that when DC offset voltage is added to
The short circuit of DC power supply is not will cause when the both ends of varactor, while the capacitance makes substrate integration wave-guide and external circuit
It separates, avoids external voltage from entering vector network analyzer by substrate integration wave-guide and burn out measuring instrument.
3. it is of the invention due to being provided with non-metallic via hole in resonant ring center, and with a blocking at resonant ring ring gap
Capacitor replaces, and the control voltage for solving varactor can not be applied directly to technical problem in substrate integration wave-guide, realization
Feeding classification in varactor merging substrate integration wave-guide, and this method is simple and easy.
4. the present invention can carry out adaptive impovement according to actual needs, by the length, the varactor that change resonant ring
Model adjust the working frequency range of filter, to meet different application demands, design simple and flexible.
5. making the size of filter reduce half, while in substrate present invention employs half module substrate integrated wave guide structure
The complementary openings resonant ring loaded on integrated waveguide can generate stopband when being higher than substrate integration wave-guide cutoff frequency resonance, from
And bandpass filter is formed, filter size also further decreases.
Detailed description of the invention
Fig. 1 is tomograph of the 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 graph in the specific embodiment of the invention 9 and embodiment 10；
Fig. 6 is the return loss S11 curve graph in the specific embodiment of the invention 9 and embodiment 10.
Specific embodiment
It elaborates with reference to the accompanying drawing to the embodiment of the present invention:
Embodiment 1
Currently, the bandpass filter based on substrate integration wave-guide form, is largely to etch not similar shape on the surface of the substrate
The resonant ring of shape is not suitable for the occasion of multiband although structure is simple.In order to be applied to the occasion of multiband, need
The filter of multiple and different frequency bands is designed, comparison between projects are complicated, not only cause design and the waste of resource, and there is also using upper
Inconvenience and temporal delay, need to handle the RF front-end circuit of multi-band signal now, need a kind of restructural substrate
Integrated waveguide bandpass filter.
Varactor is a kind of adjustable device for being relatively low cost and easy to control, is mostly based on two pole of transfiguration at present
The microwave tunable filter of form of tubes is realized in micro-strip, and the restructural substrate based on varactor form integrates wave
Conduction band bandpass filter is also fewer, the reason is that the metal column of substrate integration wave-guide side makes the earth plate of substrate integration wave-guide and upper
Surface is directly connected to, and the control voltage of such varactor can not be applied directly in substrate integration wave-guide, otherwise when transfiguration two
It will cause the short circuit of power supply when pole pipe is connected on DC bias circuit, therefore above-mentioned limitation limits varactor in substrate
Application in integrated waveguide.
For the present Research of the prior art, the present invention proposes a kind of restructural substrate integration wave-guide bandpass filter, ginseng
See Fig. 1, including microstrip dielectric substrate 1, the bottom surface of microstrip dielectric substrate 1 is metal ground plate 2, microstrip dielectric substrate edge side
Equipped with homogeneous metal via hole 3, upper surface of base plate is symmetrically equipped with resonant ring 4, collectively forms substrate integration wave-guide bandpass filtering
Device, wherein resonant ring is the identical complementary openings resonant ring of two structures, and the composition of ring is to form printed board by etching, base
Plate two sides are symmetrically arranged with feeder line 5, and the measurement that device is carried out on vector network analysis is connected to by sub-miniature A connector, but existing
Substrate integration wave-guide bandpass filter is not restructural.The present invention is respectively equipped with non-metallic via hole in two resonant ring centers
6, see Fig. 4.Varactor 7 is mounted in the non-metallic via hole 6, two transfigurations being installed in non-metallic via hole 6
The anode of diode is connected on the metal ground plate of substrate integration wave-guide, that is, is grounded；The cathode of two varactors is connected to base
In the metal part of the central bore edges in the upper surface of piece integrated waveguide, i.e. the two of substrate integration wave-guide resonant ring 4, two transfigurations two
The cathode of pole pipe is connected with two choke inductions 83 again, forms parallel branch, is connected on current limliting electricity after two parallel branch is in parallel again
82 one end are hindered, the other end of current-limiting resistance 82 is connected with DC voltage source 81.Two choke inductions 83, current-limiting resistance 82 and direct current
Potential source 81 constitutes DC bias circuit 8, sees Fig. 2.The cathode of DC voltage source 81 is connected to the metal ground plate 2 of substrate integration wave-guide
On；The metal part of resonant ring inner ring opening is replaced with a capacitance 9, and the present invention is in order to install capacitance 9 for resonance
The metal part of ring inner ring opening etches away, and is replaced with capacitance 9.It is humorous to will affect two for the size of capacitance in the present invention
The coupling shaken between ring, by largely testing and simulation analysis, The present invention gives the capacitances of capacitance in 1pF-
It is selected in 10pF, within this range, ripple is smaller in filter passband, and passband is relatively flat and bandwidth is larger.Blocking in this example
The capacitance of capacitor is 4.7pF, and the distance between two resonant rings are 12.9mm.
By adjusting load at varactor both ends in restructural substrate integration wave-guide bandpass filter of the invention
The size of reversed bias voltage realizes the restructural of substrate integration wave-guide bandpass filter.
The present invention is directed to the technical need for needing a kind of restructural substrate integration wave-guide bandpass filter, is thought using innovation
Dimension, is provided with non-metallic via hole in resonant ring center and puts varactor into, solve the control voltage of varactor without
Method is applied directly to the technical problem in substrate integration wave-guide.The present invention is by changing load in the reverse-biased electricity at varactor both ends
The size of pressure, the capacity effect that varactor generates can directly affect the field distribution in resonant ring, change the resonance frequency of resonant ring
Rate realizes the restructural of passband central frequency；The present invention realizes the feedback that varactor is directly placed in substrate integration wave-guide
Electric mode, control structure is simple, does not need simple and easy by increasing other substrates or circuit, implementation；The present invention is also
Using half module substrate integrated wave guide structure, the size of filter is made to reduce half；Due to loading complementary openings in substrate surface
Resonant ring, which can generate stopband when being higher than substrate integration wave-guide cutoff frequency resonance, so that bandpass filter is formed,
Filter size also further decreases.
Embodiment 2
The overall of restructural substrate integration wave-guide bandpass filter is constituted with design feature with embodiment 1, resonant ring center
The non-metallic via hole being arranged, the diameter of via hole match with the structure size for being placed in varactor in via hole, via diameter
Surplus between the structure size of varactor is 0.1mm, guarantees varactor convenient for the gold with substrate integration wave-guide
Belong to layer welding, guarantees the stability of varactor in the vias；The diameter of non-metallic via hole cannot be excessive simultaneously, otherwise can
The continuity of the field in substrate integration wave-guide is influenced, filtering performance is deteriorated, the model SMV1405 of varactor in this example.
Embodiment 3
The overall of restructural substrate integration wave-guide bandpass filter is constituted and design feature is with embodiment 1-2, referring to Fig. 1 and
Fig. 3, the present invention install a capacitance 9 in resonant ring inner ring opening, and one end of capacitance is connected between resonant ring inner and outer ring
Sheet metal on, it is another to terminate on the sheet metal inside resonant ring.Two resonant ring inner and outer rings it is of same size, width with
The structure size of capacitance matches, and be connected across capacitance can in inner ring just, guarantees restructural substrate integration wave-guide
The safe and reliable work of bandpass filter.The placement of capacitance 9 enables DC voltage to be added to the both ends of varactor, no
It will cause the short circuit of DC voltage source, while separate substrate integration wave-guide with external circuit, external voltage is avoided to pass through substrate collection
Enter vector network analyzer at waveguide and burns out measuring instrument.
The optimal distance between the optimal capacitance value and two resonant rings of two capacitances has also been obtained in the present invention, every
The optimal capacitance value of straight capacitor is 2.2pF, and the optimal distance between two resonant rings is 12.5mm.
Embodiment 4
The overall of restructural substrate integration wave-guide bandpass filter is constituted and design feature is with embodiment 1-3, referring to Fig. 1 and
Fig. 3, the present invention in, the coupling between two resonant ring of the distance between the size of capacitance and two resonant rings joint effect, should
The capacitance of capacitance is selected in 1pF-10pF；When the capacitance variation of capacitance, the distance between two resonant rings
Also will be with adjustment, the value of capacitance is bigger, and the distance between two resonant rings are also bigger, and distance is specifically in 11.8mm-
Optimum choice in 13.5mm guarantees that filter works normally.
Since the distance between the size of capacitance and two resonant rings will affect the coupling between two resonant rings in the present invention
It closes, and then influences the flatness of filter bandwidht.By largely testing and simulation analysis, blocking capacitance is 1pF in this example,
The distance between corresponding resonant ring is 11.8mm.
Embodiment 5
The overall of restructural substrate integration wave-guide bandpass filter is constituted and design feature is with embodiment 1-4, referring to Fig. 1 and
Fig. 3, in order to guarantee the flatness of filter passband and reduce the insertion loss of filter, the capacitance phase of two capacitances
Deng the more demanding precision of technical parameter.
The distance between the size of capacitance and two resonant rings can all influence the coupling between two resonant rings in the present invention,
And then influence the flatness of filter bandwidht.By largely testing and simulation analysis, blocking capacitance is 10pF in this example, two
The distance between resonant ring is 13.5mm.
Embodiment 6
The present invention or a kind of reconfigurable method of substrate integration wave-guide bandpass filter, in any of the above-described restructural substrate
It is realized on integrated waveguide bandpass filter, the overall of restructural substrate integration wave-guide bandpass filter is constituted with design feature with real
A 1-5 is applied, the restructural process of substrate integration wave-guide bandpass filter comprises the following steps that
Step 1: being punched on the substrate of substrate integration wave-guide bandpass filter, install and weld varactor
Non-metallic via hole is had in two complementary openings resonant ring centers, is put into varactor in the vias,
The cathode of two varactors is coupled in the metal part of the centre of substrate integration wave-guide resonant ring, and two anodes are coupled with base
On the metal ground plate of piece integrated waveguide；The matching of via diameter and varactor structure size, so that varactor is just
It is welded in substrate integration wave-guide, guarantees the stability of filter.
Step 2: installation capacitance
A capacitance is placed respectively in two resonant ring inner ring openings, the capacitance of two capacitances is equal,
The width of structure size and resonant ring matches, and one end of capacitance is connected on the metal between resonant ring inner and outer ring, the other end
It is connected on the metal inside resonant ring, separates substrate integration wave-guide with external circuit, when DC voltage is loaded into two pole of transfiguration
When pipe both ends, DC voltage source short circuit not will cause, while external voltage being avoided to enter vector network point by substrate integration wave-guide
Analyzer burns out measuring instrument.Referring to Fig. 1, the distance between the capacitance size of capacitance and two resonant rings are common in the present invention
The coupling between two resonant rings is influenced, when the capacitance variation of capacitance, the distance between two resonant rings will also be adjusted therewith
It is whole, make filter work in optimum state, the DC bias circuit of capacitance and bandpass filter is connectionless；
Step 3: completing the connection of DC bias circuit, generally form restructural substrate integration wave-guide bandpass filter
Two varactor cathode are welded to form parallel branch with two choke inductions respectively, which is welded to limit
The other end of one end of leakage resistance 82, current-limiting resistance 82 is connected with the anode of DC voltage source 81, the cathode of DC voltage source 81
It is welded on the metal ground plate of substrate integration wave-guide；
Step 4: realizing the restructural of substrate integration wave-guide bandpass filter by changing DC voltage
4.1 adjust DC voltage source 81, change the size of DC voltage source voltage；
4.2 by software emulation, when the substrate integration wave-guide bandpass filter resonance that load complementary openings resonant ring is constituted
When, the electric field in substrate integration wave-guide is mainly distributed in resonant ring, and the change of 81 voltage of DC voltage source causes two pole of transfiguration
The change of junction capacity on pipe, the capacity effect that varactor generates directly affect the field distribution of resonant ring, change the resonance of resonant ring
Frequency, and then change the centre frequency of filter passband；
4.3 when DC voltage source size from 0V to 30V consecutive variations, corresponding passband central frequency is in 1.9GHz-
Consecutive variations within the scope of 2.5GHz；
4.4 adjust DC voltage source 81, realize the restructural of substrate integration wave-guide bandpass filter.
The present invention places a varactor due to being provided with non-metallic via hole in resonant ring center in the vias, solution
The technical problem that varactor of having determined can not be directly placed in substrate integration wave-guide；Metal part at resonant ring ring gap
It is replaced with a capacitance, avoids the short circuit of DC voltage source, realized in varactor merging substrate integration wave-guide
Feeding classification, control mode is simple, and this method is simple and easy.
Embodiment 7
The reconfigurable method of substrate integration wave-guide bandpass filter is with embodiment 6, in step 4, when the electricity of DC voltage source
When pressure is 0V, corresponding filter passband centre frequency is 1.9GHz；When voltage is 4.7V, corresponding filter passband center
Frequency is 2.2GHz；When voltage is 30V, corresponding filter passband centre frequency is 2.5GHz.
Embodiment 8
The reconfigurable method of substrate integration wave-guide bandpass filter is the same as embodiment 6, restructural substrate integration wave-guide band logical filter
The overall of wave device is constituted and design feature is with embodiment 1-5, in conjunction with below by restructural substrate integration wave-guide bandpass filter and
Its reconfigurable method, which combines together, makees an example explanation.
Referring to Fig. 1 and Fig. 3, the present invention is mainly by microstrip dielectric substrate 1, metal ground plate 2, microstrip dielectric substrate side
Homogeneous metal via hole 3, complementary openings resonant ring 4, feeder line 5, the non-metallic via hole 6 in split ring resonator center are non-metallic
Varactor 7 in via hole, DC circuit 8, capacitance 9 form.Wherein:
Microstrip dielectric substrate 1 covers silver plate using two-sided, and two-sided cover below silver plate is metal ground plate 2, in micro-strip medium base
1 edge side of plate is equipped with metallization VIA 3, sees Fig. 4, forms half module substrate integrated wave guide structure；Feeder line 5 is symmetrically distributed in
On layer metal plate, the measurement that device is carried out on vector network analyzer is connected to by sub-miniature A connector；It is two-sided to cover the upper surface of silver plate symmetrically
Set there are two identical complementary openings resonant ring 4, substrate integration wave-guide bandpass filter is formed by the above structure；In resonant ring
Center is equipped with non-metallic via hole 6, places a varactor 7 respectively in two via holes, the diameter of via hole and is placed in
The structure size of varactor matches in hole, is put into varactor just in non-metallic via hole, guarantees transfiguration two
Pole pipe is convenient for welding with the metal layer of substrate integration wave-guide, guarantees the stability of varactor in the vias；It is nonmetallic simultaneously
The diameter for changing via hole cannot be excessive, otherwise will affect the continuity of the field in substrate integration wave-guide, and filtering performance is deteriorated.Referring to figure
2, the cathode of two varactors is coupled in the metal part in substrate integration wave-guide resonant ring center, and two choke inductions 83 divide
Parallel branch is not connected to form with the cathode of two varactors, is connected on 82 one end of current-limiting resistance, current limliting electricity after in parallel again
It hinders 82 other ends to connect with DC voltage source 81, the anode of two varactors is connected to substrate collection together with the cathode of DC voltage source
At on the metal ground plate 2 of waveguide.
The inner ring opening for loading the complementary openings resonant ring on substrate integration wave-guide is equivalent to a capacitor, in order to realize
Feeding classification of the varactor in substrate integration wave-guide, metal part of the present invention in the two resonant ring inner ring openings
Place is replaced with a capacitance 9 respectively, sees Fig. 1 and Fig. 3；In order to install capacitance 9, by the metal of resonant ring inner ring opening
Partial etching falls, and is replaced with capacitance 9, and two capacitances separate substrate integration wave-guide with external circuit, work as DC voltage
Load not will cause DC voltage source short circuit at diode both ends, while external voltage being avoided to enter arrow by substrate integration wave-guide
Amount Network Analyzer burns out measuring instrument.The distance between the capacitance size of capacitance 9 and two resonant rings joint effect two
Coupling between resonant ring, when the capacitance variation of capacitance 9, the distance between two resonant rings will also adjust therewith, make
Filter works in optimum state.It is obtained by a large amount of simulation analysis, show that the optimal value of capacitance is 2.2pF, two is humorous
Optimal distance between vibration ring is 12.5mm.
Two resonant ring inner and outer rings it is of same size, inside and outside ring width is 0.6mm in this example, two resonant ring inner and outer rings
The structure size of width and capacitance matches, and guarantees the safe and reliable work of restructural substrate integration wave-guide bandpass filter
Make.In order to guarantee the flatness of filter passband, the capacitance of two capacitances 9 is equal, and technical parameter is more demanding
Precision.
Pass through emulation, when loading the substrate integration wave-guide bandpass filter resonance that complementary openings resonant ring is constituted, substrate
Electric field in integrated waveguide is mainly distributed in resonant ring, therefore the size by changing reversed bias voltage on varactor 7, is become
The capacity effect for holding the generation of diode 7 can directly affect the field distribution of resonant ring, change the resonance frequency of resonant ring, and then change
The centre frequency of filter passband realizes the restructural of substrate integration wave-guide bandpass filter.
Effect of the invention can be by emulating and testing further explanation:
Embodiment 9
The reconfigurable method of substrate integration wave-guide bandpass filter is the same as embodiment 6-8, restructural substrate integration wave-guide band logical
The overall of filter is constituted with design feature with embodiment 1-5.
Set relative dielectric constant εr=2.2, media plate thickness 0.8mm, feeder line width 2.5mm are soft in Electromagnetic Simulation
Part HFSS emulate and be tested material object using vector network measuring instrument N5230A to filter, obtains filter
Insertion loss curve S21 such as Fig. 5 and return loss plot S11 such as Fig. 6.
When the voltage of DC voltage source 81 changes within the scope of 0V-30V, filter passband of the present invention is arrived in 1.9GHz
2.5GHz continuously adjustable.For more acurrate explanation, the present embodiment is chosen 3 points and is explained, respectively 1.9GHz, 2.2GHz,
2.5GHZ is shown in Fig. 5, can be seen that filter from the insertion loss S21 of the restructural substrate integration wave-guide bandpass filter of the present invention
Passband is continuously adjustable in 1.9GHz to 2.5GHz, and tuning range is larger.The response curve for 3 points chosen in figure shows: in band
Maximum Insertion Loss is respectively less than 2dB, and with having a transmission zero outside, Out-of-band rejection is preferable.
The present invention can carry out adaptive impovement according to actual needs, by changing the length of resonant ring, varactor
Model adjusts the working frequency range of filter, to meet different application demands, designs simple and flexible.
Embodiment 10
The reconfigurable method of substrate integration wave-guide bandpass filter is the same as embodiment 6-9, restructural substrate integration wave-guide band logical
The overall of filter is constituted with design feature with embodiment 1-5.
Return loss plot S11 of the invention is shown in Fig. 6, equally chooses 3 points in this example and is explained, i.e.,
1.9GHz, 2.2GHz, 2.5GHZ, echo damage of the filter in working frequency range it can be seen from three points chosen in figure
Consumption is all larger than 15dB, and filtering performance is preferable.
It is consistent with measured result by Fig. 5 and simulation result it can be seen from Fig. 6.
In conclusion a kind of restructural substrate integration wave-guide bandpass filter disclosed by the invention and its reconfigurable method,
Mainly solution tuning range is small, restructural substrate integration wave-guide bandpass filter insertion loss is big, varactor control electricity
Press the technical problem that can not be applied directly in substrate integration wave-guide.The filter includes microstrip dielectric substrate 1, metal ground plate 2,
The homogeneous metal via hole 3 of microstrip dielectric substrate side, two symmetrical complementary openings resonant rings 4, feeder line 5, resonant ring
The non-metallic via hole 6 in center, the varactor 7 in non-metallic via hole, varactor 7 and 8 phase of DC bias circuit
Even, capacitance 9.Its key is to be respectively put into a varactor in two non-metallic via holes, and complementary openings are humorous
The metal part of vibration ring inner ring opening is replaced with a capacitance, and the reversed bias voltage at varactor both ends is added in by changing
Size, varactor generate capacity effect can directly affect the field distribution situation in resonant ring, change the resonance of resonant ring
Frequency realizes the restructural of passband central frequency.The present invention realizes feed side of the varactor in substrate integration wave-guide
Formula, control mode is simple and easy, and frequency tuning range is larger, in-band insertion loss is smaller, can be used for wireless communication system.
Above-mentioned example is a part of the embodiments of the present invention, instead of all the embodiments.Based on the reality in the present invention
Example is applied, every other embodiment obtained by those of ordinary skill in the art without making creative efforts all belongs to
In the scope of protection of the invention.
Claims (7)
1. a kind of restructural substrate integration wave-guide bandpass filter, including microstrip dielectric substrate (1), microstrip dielectric substrate (1)
Bottom surface is metal ground plate (2), and microstrip dielectric substrate edge side is equipped with homogeneous metal via hole (3), and upper surface of base plate is symmetrical
Be equipped with resonant ring (4), collectively form substrate integration wave-guide bandpass filter, wherein resonant ring be the identical complementation of two structures
Split ring resonator, substrate two sides are symmetrically arranged with feeder line (5), it is characterised in that: two resonant ring centers are respectively equipped with non-metallic
Via hole (6) is equipped with varactor (7) in non-metallic via hole (6), and two varactor cathode are coupled with substrate collection
In metal part at two resonant ring (4) centers of waveguide, two choke inductions (83) respectively with two varactor cathode phases
Even composition parallel branch is connected on current-limiting resistance (82) one end, current-limiting resistance (82) other end and DC voltage source after in parallel again
(81) it connects；Two choke inductions (83), current-limiting resistance (82) and DC voltage source (81) constitute DC bias circuit (8)；Two become
The anode for holding diode is connected on the metal ground plate (2) of substrate integration wave-guide；The metal part of resonant ring inner ring opening is used
One capacitance (9) replaces；Substrate integration wave-guide is realized in the size of varactor both ends reversed bias voltage by adjusting load
Bandpass filter it is restructural.
2. a kind of restructural substrate integration wave-guide bandpass filter according to claim 1, which is characterized in that the resonance
The non-metallic via hole of ring center setting, the diameter of via hole match with the structure size for being placed in varactor in via hole.
3. a kind of restructural substrate integration wave-guide bandpass filter according to claim 1, which is characterized in that in resonant ring
The metal part of ring opening is replaced with a capacitance, and one end of capacitance is connected on the metal between resonant ring inner and outer ring,
It is another to terminate on the metal inside resonant ring, of same size, the knot of width and capacitance of two resonant ring inner and outer rings
Structure size matches.
4. a kind of restructural substrate integration wave-guide bandpass filter according to claim 1, which is characterized in that blocking electricity
The capacitance of appearance is selected in 1pF-10pF；When the capacitance variation of capacitance, the distance between two resonant rings also will be with
Adjustment, the value of capacitance is bigger, and the distance between two resonant rings are also bigger, distance it is specifically excellent in 11.8mm-13.5mm
Change selection, works normally filter.
5. a kind of restructural substrate integration wave-guide bandpass filter according to claim 3, which is characterized in that capacitance
Optimal capacitance value be 2.2pF.
6. a kind of reconfigurable method of substrate integration wave-guide bandpass filter, which is characterized in that any described in claim 1-5
Restructural substrate integration wave-guide bandpass filter on realize, the restructural process of substrate integration wave-guide bandpass filter, including
It has the following steps:
Step 1: being punched on the substrate of substrate integration wave-guide bandpass filter, install and weld varactor；
Non-metallic via hole is had in two complementary openings resonant ring centers, is put into varactor in the vias, two become
The cathode for holding diode is coupled in the metal part in two resonant ring of substrate integration wave-guide center, and two anodes are coupled with substrate
On the metal ground plate of integrated waveguide；
Step 2: installation capacitance；
A capacitance is placed respectively in two resonant ring inner ring openings, and the capacitance of two capacitances is equal, structure
The width of size and resonant ring matches, and one end of capacitance is connected on the metal between resonant ring inner and outer ring, another to terminate to
On metal inside resonant ring, which separate substrate integration wave-guide with external circuit, when DC voltage is added to transfiguration
When diode both ends, DC voltage source short circuit not will cause, while external voltage being avoided to enter vector net by substrate integration wave-guide
Network analyzer burns out measuring instrument；
Step 3: completing the connection of DC bias circuit, generally form restructural substrate integration wave-guide bandpass filter；
Two varactor cathode are welded to form parallel branch with a choke induction respectively, which is welded to current limliting electricity
The one end of (82) is hindered, the other end of current-limiting resistance (82) is connected with the anode of DC voltage source (81), DC voltage source (81)
Cathode is welded on the metal ground plate of substrate integration wave-guide；
Step 4: realizing the restructural of substrate integration wave-guide bandpass filter by changing DC voltage；
4.1 adjust DC voltage source (81), change the size of DC voltage source (81) voltage；
The change of 4.2 DC voltage sources (81) voltage causes the change of junction capacity on varactor, the capacitor that varactor generates
Effect directly affects the field distribution of resonant ring, changes the resonance frequency of resonant ring, and then change the centre frequency of filter passband；
4.3 when DC voltage source size from 0V to 30V consecutive variations, corresponding passband central frequency is in 1.9GHz-2.5GHz
Consecutive variations in range；
4.4 adjust DC voltage source (81), realize the restructural of substrate integration wave-guide bandpass filter.
7. a kind of reconfigurable method of substrate integration wave-guide bandpass filter according to claim 6, which is characterized in that step
In rapid 4, when the voltage of DC voltage source is 0V, corresponding filter passband centre frequency is 1.9GHz；When voltage is 4.7V
When, corresponding filter passband centre frequency is 2.2GHz；When voltage is 30V, corresponding filter passband centre frequency is
2.5GHz。
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| CN106992754A (en) * | 2017-03-02 | 2017-07-28 | 电子科技大学 | A kind of multi-functional frequency mixer of fixed intermediate frequency output |
| CN107546446B (en) * | 2017-07-18 | 2019-03-05 | 电子科技大学 | The changeable reconfigurable filter of multimode multi-pass band |
| CN107546451B (en) * | 2017-07-18 | 2020-03-27 | 电子科技大学 | Electric tuning filter based on regular hexagon half-mode substrate integrated waveguide and CSR structure |
| CN107681245B (en) * | 2017-09-22 | 2020-07-31 | 许昌学院 | Single-negative metamaterial heterojunction loaded with comb-shaped inductor and open resonant ring |
| CN112805878B (en) * | 2018-10-10 | 2022-05-24 | 华为技术有限公司 | Antenna, wireless device and antenna array |
| CN110504945B (en) * | 2019-08-05 | 2022-12-02 | 电子科技大学 | Reconfigurable annular filtering device |
| CN110729538B (en) * | 2019-11-07 | 2021-08-03 | 电子科技大学 | Miniaturized ultra wide band-pass filter with reconfigurable trapped wave band |
| CN111342216B (en) * | 2020-03-11 | 2022-06-17 | 中天宽带技术有限公司 | Beam width reconfigurable antenna |
| CN114927841B (en) * | 2022-05-20 | 2023-09-08 | 重庆邮电大学 | Reconfigurable filter based on complementary split ring and SIW structure |
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