CN108448215A - A kind of C-band electricity tune cavity body filter - Google Patents

A kind of C-band electricity tune cavity body filter Download PDF

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Publication number
CN108448215A
CN108448215A CN201810470376.7A CN201810470376A CN108448215A CN 108448215 A CN108448215 A CN 108448215A CN 201810470376 A CN201810470376 A CN 201810470376A CN 108448215 A CN108448215 A CN 108448215A
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CN
China
Prior art keywords
cavity
filter
tuning
electricity tune
rectangular cavities
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Pending
Application number
CN201810470376.7A
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Chinese (zh)
Inventor
马向华
卜景鹏
裴旭潮
蔡壮华
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GUANGDONG SHENGDA ELECTRONIC CO Ltd
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GUANGDONG SHENGDA ELECTRONIC CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to CN201810470376.7A priority Critical patent/CN108448215A/en
Publication of CN108448215A publication Critical patent/CN108448215A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00Auxiliary devices
    • H01P1/20Frequency-selective devices, e.g. filters
    • H01P1/207Hollow waveguide filters

Abstract

The present invention provides a kind of C-band electricity tune cavity body filter, including cavity body filter, by motor-driven mechanical tuning device;Cavity body filter includes the rectangular cavities with cover board;It is respectively arranged with the input and output connector of filter at cover board both ends, in rectangular cavities, it is inwardly extended with partition board from the side wall of rectangular cavities, partition board will be separated into the resonant cavity of one group of rectangle in rectangular cavities, gap between the partition board of both sides forms the coupling window between adjacent resonant cavity, it is provided on the cover board to the coupling window and is provided with stiffness of coupling fine adjustment screw, the tuned window for leading to each resonant cavity being respectively set on the cavity face of cover board opposite, mechanical tuning device is mounted on cavity face, tuning column stretches into resonant cavity from tuned window under mechanical tuning device control and realizes tuning.The design of C-band electricity tune cavity body filter is based on coupling Bandwidth Method in the present invention, by reasonably selecting the coupled structure between filter cavity so that keeps not deteriorating with Q values in interior matching and cavity in filter frequency modulation.

Description

A kind of C-band electricity tune cavity body filter
Technical field
The present invention relates to electricity to adjust cavity body filter field, more particularly to a kind of C-band electricity tune cavity body filter, is a kind of tool There is the C-band electricity tune chamber of the good squareness factor of filter with low insertion loss, full frequency band, high-frequency tuning precision and high power capacity Fluid filter.
Background technology
The most commonly used filter is bandpass filter in general communication system, only useful signal is allowed to pass through, and remaining Useless signal, either this communication system self-interference signal or intentional interference signal, are effectively filtered out.This is for communication The good reception of equipment is played the role of very important, is the most effective means for tackling electromagnetic interference.Tunable filter is come Say not only there is These characteristics, and can flexibly change band connection frequency according to frequency configuration, therefore most heavy as military communication One of interference protection measure wanted.
Increasingly raising with communication system to electronic counter-countermeasures (ECCM) Capability Requirement, to the narrow-band filtering of frequency band adjustable Device research and development propose increasingly higher demands.Tunable filter is widely used in more passbands, broadband and frequency hopping communications and radar system, It is the significant components of system radio frequency front end.Tunable filter according to frequency hopping realization method mainly include ferrite electrically tunable filter, Switching capacitance matrix and mechanical tunable filter three types.The power capacity of ferrite electrically tunable filter filter It is limited, while Insertion Loss is also larger, is unsuitable to apply to high power RF power front end and low-noise reception front end applications;Switching capacity Matrix form electrically tunable filter has many advantages, such as that high power capacity and tuned speed are high, but its filter order is relatively low, Out-of-band rejection Finite sum squareness factor is bad, and such bounce frequency filter applies in general to low-frequency range (VHF-S wave bands), and electricity is realized in higher frequency range Tunable filter needs low capacitance (fF magnitudes) high-performance capacitor, high q-factor capacitance, thus difficult to realize.Cavity body filter has height Power capacity and high q-factor, the mechanical tunable filter of waveguide cavity is because of the features such as its quality factor is high, insertion loss is small, in radio frequency Front end applications are extensive, but in high band, and mechanical frequency adjusting can cause to deteriorate with Q values in interior matching and cavity, when serious Filter freguency response curve deformation is violent, causes filter effect bad.Cavity body filter is due to metal heat-expansion shrinkage effect, filter Wave device frequency band has temperature drift, and error is brought to the frequency hopping precision of mechanical bounce frequency filter.It adjusts in different thermomechanical formulas Design bandwidth is constant in tunable filter frequency range, the good tunable filter of amplitude versus frequency characte is still the technology for needing to solve One of difficult point.
Invention content
The present invention is directed to the above-mentioned deficiency of current tunable filter, provides a kind of C-band electricity tune cavity body filter, the C waves Section electricity adjusts cavity body filter design based on coupling Bandwidth Method, by reasonably selecting the coupled structure between filter cavity so that filtering It keeps not deteriorating with Q values in interior matching and cavity when wave device frequency modulation, realizes good standing wave and the interior Insertion Loss fluctuation of small band, Good Chebyshev's waveform is kept within the scope of filter frequency hopping.
The present invention realizes that its technical purpose technical solution is:A kind of C-band electricity tune cavity body filter, including cavity filtering Device, by motor-driven mechanical tuning device;The cavity body filter includes the rectangular cavities with cover board;In the lid Plate both ends are respectively arranged with the input and output connector of filter, inside from the side wall of rectangular cavities in the rectangular cavities Be extended with partition board, the partition board will be separated into the resonant cavity of one group of rectangle in rectangular cavities, between the partition board of both sides between Gap forms the coupling window between adjacent resonant cavity, is provided on the cover board to the coupling window and is provided with coupling Intensity fine adjustment screw, the tuned window for leading to each resonant cavity being respectively set on the cavity face of cover board opposite, the tuning machine Structure is mounted on cavity face, and tuning column stretches into resonant cavity from tuned window under the mechanical tuning device control and realizes tuning.
The design of C-band electricity tune cavity body filter is based on coupling Bandwidth Method in the present invention, by between reasonable selection filter cavity Coupled structure so that in filter frequency modulation keep with it is interior matching and cavity in Q values do not deteriorate, realize good standing wave and The interior Insertion Loss fluctuation of small band, keeps good Chebyshev's waveform within the scope of filter frequency hopping.
Further, above-mentioned C-band electricity tune cavity body filter:The rectangular cavities use linear expansion coefficient 1.5e-6 ,- The invar alloy that its strain of 45~55 ° of ambient temperature ranges is 1.5e-4 is processed;The rectangular cavities integrally use gilt watch Surface treatment, thickness of coating are the skin depth of three times.
Further, above-mentioned C-band electricity tune cavity body filter:The depth that the tuning column stretches into resonant cavity is 0-5mm.
Further, above-mentioned C-band electricity tune cavity body filter:In the rectangular cavities, side wall is inwardly extended with 4 To partition board, rectangular cavities are separated into the resonant cavity of five rectangles, the resonant cavity is regular hexahedron cavity.
Further, above-mentioned C-band electricity tune cavity body filter:The mechanical tuning device includes being mounted on cavity face Holder is tuned, the tuning column is mounted on the bottom of the tuning holder;It is equipped with one in the tuning frame upper To linear bearing, the guide post of linear bearing is installed vertically on cavity face.
Further, above-mentioned C-band electricity tune cavity body filter:Tuning column is provided on cavity face, at tuned window Mounting base is provided with the memory alloy elastic folder and pressure of the close surface gold-plating processing for waling tuning column in the mounting base In the pressure cap of memory alloy elastic folder.
Further, above-mentioned C-band electricity tune cavity body filter:The pressure cap is in a ring, annular in the pressure cap One of inner circle is diametrically provided with a word locking slot;In a ring, inner ring is formed and tuning column the memory alloy elastic folder The resilient electrical contact face that side is in contact is respectively formed top elastic strain release in memory alloy elastic ogival sections and bottom and cuts Mouth and bottom resilient strain relief notch.
Further, above-mentioned C-band electricity tune cavity body filter:The motor is a pair of using a mounting bracket installation Stepper motor on cavity face, mounting bracket symmetrically cover on the both ends of tuning holder, are provided in the corresponding place of tuning holder The connecting seat being rotatably connected with stepper motor lead screw is provided with add compatible with the screw thread on lead screw in the connecting seat Close high-precision screw screw thread.
Further, above-mentioned C-band electricity tune cavity body filter:It is also disposed with fastening silk ribbon attached to an official seal top in the lead screw Silk, spring fastener and preloading spring.
Below with reference to drawings and examples, the present invention is described in detail.
Description of the drawings
Fig. 1 is electrically tunable filter overall construction drawing.
Fig. 2 is 1 cavity body filter stereogram of the embodiment of the present invention.
Fig. 3 is 1 cavity body filter sectional view of the embodiment of the present invention.
Fig. 4 is 1 cavity body filter front view of the embodiment of the present invention.
Fig. 5 is that the embodiment of the present invention 1 tunes column mounting structure.
Fig. 6 is Fig. 5 A amplifications.
Fig. 7 is 1 pressure cap structure chart of the embodiment of the present invention.
Fig. 8 is 1 memory alloy elastic clamping structure figure of the embodiment of the present invention.
Fig. 9 is Fig. 8 sectional views.
Figure 10 is Fig. 8 front views.
Figure 11 is 1 frequency tuning structural scheme of mechanism of the embodiment of the present invention.
Figure 12 is that the embodiment of the present invention 1 tunes rack assumption diagram.
Figure 13 is 1 electric motor mounting structure figure of the embodiment of the present invention.
Figure 14 is 1 motor of the embodiment of the present invention and tuning holder connection figure.
Figure 15 is Figure 14 B enlarged drawings.
Specific implementation mode
Embodiment 1, the present embodiment are a kind of C-band electricity tune cavity body filters as shown in Figure 1, being broadly divided into three parts:1) Cavity body filter;2) frequency tuning structure 30;3) 42 drive part of motor.Cavity body filter is mutual by five resonant cavities 19 Five stage structures of resonance, 5 frequency tuning columns 31 are located at the center of each resonant cavity 19, and filtering is adjusted by the depth of insertion The working frequency of device.Tuning column 31 is both secured on tuning holder 35, passes through leading screw 50 and the tuning holder 35 of stepper motor 42 Upper 304 drive mechanism of encryption high-precision screw screw thread tunes moving up and down for holder 35 to realize, to ensure to tune 35 water of holder Prosposition, which is set, to be stablized motionless, two linear bearings 33 is arranged in tuning holder 35 centre position, tuning holder 35 in this way is merely able to Lower movement, will not because offset cause frictional force increase caused by 42 step-out of motor.
In the present embodiment, used radio frequency cavity body filter design is based on coupling Bandwidth Method, by reasonably selecting resonance Coupled structure between cavity 19 so that keep not deteriorating with Q values in interior matching and cavity in filter frequency modulation, realize good Standing wave and the interior Insertion Loss fluctuation of small band, good Chebyshev's waveform is kept within the scope of filter frequency hopping, is kept simultaneously Standing wave and do not deteriorate significantly with interior Insertion Loss.
In the present embodiment, C-band electricity tune cavity body filter divides three parts:Cavity 10, cover board 17 and input and output connector 18. The resonant element that cavity 10 is made of 5 cabinet shape resonant cavities 19 adopts coupling, and resonant cavity 19 is designed using coupling Bandwidth Method Between coupled structure, corresponding to the position setting of coupling window 14 in cover board 17, there are four stiffness of coupling fine tuning screw hole tuned windows 13.Cavity In, the one side opposite with cover board 17 is cavity face 15, cavity face 15 is provided with filter frequencies tuned window 13, in each cavity 19 center opening of resonant cavity of unit, while also there are 33 guide posts 36 of 42 mounting base 40 of motor and linear bearing in cavity face 15 Mounting hole.As shown in Figure 2,3, 4.
Specifically, the present embodiment cavity body filter includes the rectangular cavities 10 with cover board 17;At 17 both ends of cover board It is respectively arranged with the input and output connector 18 of filter, in rectangular cavities 10, is inwardly stretched out from the side wall 11 of rectangular cavities 10 There are 4 pairs of partition boards 12, this 4 pairs of partition boards 12 will be separated into the resonant cavity 19 of one group of 5 rectangle, the partition board of both sides in rectangular cavities 12 Gap between 12 forms the coupling window 14 between adjacent resonant cavity 19, is provided on cover board 17 to coupling window 14 and is arranged There is stiffness of coupling fine adjustment screw 16, on 17 opposite cavity face 15 of cover board, 19 middle of each resonant cavity is respectively set logical To the tuned window 13 of each resonant cavity 19, mechanical tuning device 30 is mounted on cavity face 15, and tuning column 31 is controlled in mechanical tuning device 30 Under from tuned window 13 stretch into resonant cavity 19 realize tuning.
In the present embodiment, 10 structure of filter cavity is processed using invar alloy, linear expansion coefficient 1.5e-6, -45~55 ° Its strain of ambient temperature range is 1.5e-4, and the frequency shift (FS) room temperature of filter is about 0.5MHz when high/low temperature.Filter cavity Body 10 is whole to be handled using gold-plated surface, and thickness of coating is the skin depth of three times.
Being inserted into the frequency of tuning 31 filter of column can reduce, and the insertion depth for tuning column is 0~5mm, the frequency of filter Variation range is 5.55~5.85GHz, while keeping standing wave and Insertion Loss curve good.In the present embodiment, the size of cavity according to Practice and the wavelength of C-band waveform match to form resonance.
As is illustrated by figs. 11 and 12, filter tuner structure 30, main body are that tuning 35,5 frequency tuning columns 31 of holder are pacified Loaded on 35 bottom of tuning holder, two linear bearings 33 are installed on 35 top of tuning holder.It tunes 35 bottom of holder and is equipped with 5 tune Humorous column mounting hole 303, top are two linear bearing mounting holes 301, and top both sides are that 42 lead screw 50 of motor connects with tuning holder 35 Two connecting seats 302 connect are equipped with encryption high-precision screw screw thread 304 in connecting seat 302.
Electrically tunable filter ensures that the key that filter freguency response does not deteriorate when frequency modulation is to tune column and filter cavity Good electrical contact.A kind of memory alloy elastic folder 20 is devised in the present embodiment, is made of memory alloy of titanium, surface gold-plating Processing, be arranged exclusively for installation tuning column 31 and in the mounting base 37 of setting, can closely wale tuning column on tuned window 303 31, ensure good radio frequency electrical contact.The Memorability of its material is with the elastic certifiable stability to work long hours and reliably Property.Memory alloy elastic folder 20 is compressed by union cap (UC) 21, keeps certain dynamics, it is ensured that can with tuning column 31 it is good contact and Frictional force is unlikely to excessive.Memory alloy elastic folder 20, fit structure such as Fig. 5 of pressure cap 21 and filter cavity 10,6,7,8, 9, shown in 10.Memory alloy of titanium elastic clip 20 is toroidal cavity structure, and section circular upper part and square lower part, inner ring is resilient electrical contact face, ring Notch is arranged at shape cavity top and bottom, for discharging elastic strain when elasticity squeezes.Inner ring is formed and tuning 31 side phase of column The resilient electrical contact face 201 of contact is respectively formed top elastic strain release in 20 top and bottom of memory alloy elastic folder and cuts Mouth 202 and bottom resilient strain relief notch 203.
In the present embodiment, motor 42 is two stepper motors, and stepper motor is by mounting bracket installation 40 in rectangular cavities 10 Cavity face 15, mounting structure is as shown in Figure 13,14 and 15.Mounting bracket 40 symmetrically covers on the both ends of tuning holder 35, is tuning 35 corresponding place of holder is provided with the connecting seat 302 being rotatably connected with stepper motor lead screw 50, is provided in connecting seat 302 Encryption high-precision screw screw thread compatible with the screw thread on lead screw 50 304.It is also disposed with fastening silk ribbon attached to an official seal top in lead screw 50 Silk 51, spring fastener 52 and preloading spring 53.
Motor driving shaft is connect with lead screw 50, is fastened by jackscrew 51.Leading screw 50 and the screw structure in tuning holder 35 The transmission of motor is converted to about 35 holder of tuning and moved along a straight line by cooperation.It is installed in spring fastener 52 and tuning holder 35 and connects The screw that preloading spring 53 between joint chair 302 forms compatible with the screw thread encryption high-precision screw screw thread of lead screw 50 304 Structure is held out against in advance, and it is poor to eliminate the backhaul that the reciprocating motion of motor 42 is brought.
In the present embodiment, screw screw pitch is 0.5mm, 1.8 ° of stepper motor corner accuracy, such single step straight line on lead screw 50 It is 2.5um to advance, and single step frequency maximum changes 0.25MHz, and precision is higher.

Claims (9)

1. a kind of C-band electricity tune cavity body filter, including cavity body filter, the mechanical tuning device (30) that is driven by motor (42);Its It is characterized in that:The cavity body filter includes the rectangular cavities (10) with cover board (17);In the cover board (17) Both ends are respectively arranged with the input and output connector (18) of filter, in the rectangular cavities (10), from rectangular cavities (10) Side wall (11) be inwardly extended with partition board (12), the partition board (12) will be separated into the humorous of one group of rectangle in rectangular cavities (10) Shake cavity (19), and the gap between the partition board (12) of both sides forms the coupling window (14) between adjacent resonant cavity (19), It is provided on the cover board (17) to the coupling window (14) and is provided with stiffness of coupling fine adjustment screw (16), in cover board (17) The tuned window (13) for leading to each resonant cavity (19) being respectively set on opposite cavity face (15), the mechanical tuning device (30) peace On cavity face (15), tuning column (31) stretches into resonant cavity under mechanical tuning device (30) control from tuned window (13) (19) tuning is realized.
2. C-band electricity tune cavity body filter according to claim 1, it is characterised in that:The rectangular cavities (10) are adopted With linear expansion coefficient 1.5e-6, the invar alloy that -45~55 ° of ambient temperature range its strains are 1.5e-4 is processed;The rectangle Cavity (10) is integrally handled using gold-plated surface, and thickness of coating is the skin depth of three times.
3. C-band electricity tune cavity body filter according to claim 1, it is characterised in that:The tuning column (31) stretches into The depth of resonant cavity (19) is 0-5mm.
4. C-band electricity tune cavity body filter according to claim 1, it is characterised in that:In the rectangular cavities (10) In, side wall (11) is inwardly extended with 4 pairs of partition boards (12), and rectangular cavities (10) are separated into the resonant cavity (19) of five rectangles, The resonant cavity (19) is regular hexahedron cavity.
5. C-band electricity tune cavity body filter according to claim 1 or 2 or 3 or 4, it is characterised in that:The tuning machine Structure (30) includes the tuning holder (35) being mounted on cavity face, and the tuning column (31) is mounted on the tuning holder (35) bottom;A pair of of linear bearing (33), the guiding of linear bearing (33) are installed on described tuning holder (35) top Column (36) is installed vertically on cavity face (15).
6. C-band electricity tune cavity body filter according to claim 5, it is characterised in that:On cavity face (15), tuned window (13) it is provided with the mounting base (37) of tuning column (31) at, is provided in the mounting base (37) and closely wales tuning column (31) the memory alloy elastic folder (20) of surface gold-plating processing and the pressure cap (21) for being pressed in memory alloy elastic folder (20).
7. C-band electricity tune cavity body filter according to claim 6, it is characterised in that:The pressure cap (21) in a ring, One in the annular inner circle of the pressure cap (21) is diametrically provided with a word locking slot;The memory alloy elastic folder (20) Toroidal cavity structure, inner ring forms the resilient electrical contact face (201) being in contact with tuning column (31) side, in memory alloy elastic Top elastic strain release notch (202) and bottom resilient strain relief notch (203) are respectively formed at the top and bottom of folder (20).
8. C-band electricity tune cavity body filter according to claim 5, it is characterised in that:The motor (42) is a pair Stepper motor on cavity face (15) is mounted on using a mounting bracket (40), mounting bracket (40) symmetrically covers on tuning holder (35) Both ends, the corresponding place of tuning holder (35) is provided with the connecting seat (302) being rotatably connected with stepper motor lead screw (50), It is provided with encryption high-precision screw screw thread (304) compatible with the screw thread on lead screw (50) in the connecting seat (302).
9. C-band electricity tune cavity body filter according to claim 8, it is characterised in that:The lead screw (50) also according to It is secondary to be provided with fastening silk ribbon attached to an official seal jackscrew (51), spring fastener (52) and preloading spring (53).
CN201810470376.7A 2018-05-16 2018-05-16 A kind of C-band electricity tune cavity body filter Pending CN108448215A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020080796A1 (en) * 2018-10-15 2020-04-23 주식회사 케이엠더블유 Cavity filter

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101950833A (en) * 2010-10-12 2011-01-19 福建星海通信科技有限公司 Adjustable mechanical filter with uniform tuning function
CN102544650A (en) * 2012-01-05 2012-07-04 西安电子科技大学 Coaxial resonant cavity mixed coupling method
CN204130671U (en) * 2014-10-22 2015-01-28 东莞洲亮通讯科技有限公司 A kind of structure being applicable to cavity electrically tunable filter
CN205319273U (en) * 2015-12-31 2016-06-15 中国电子科技集团公司第五十四研究所 Coaxial electrically tunable filter of multicavity
CN208062224U (en) * 2018-05-16 2018-11-06 广东圣大电子有限公司 A kind of C-band electricity tune cavity body filter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101950833A (en) * 2010-10-12 2011-01-19 福建星海通信科技有限公司 Adjustable mechanical filter with uniform tuning function
CN102544650A (en) * 2012-01-05 2012-07-04 西安电子科技大学 Coaxial resonant cavity mixed coupling method
CN204130671U (en) * 2014-10-22 2015-01-28 东莞洲亮通讯科技有限公司 A kind of structure being applicable to cavity electrically tunable filter
CN205319273U (en) * 2015-12-31 2016-06-15 中国电子科技集团公司第五十四研究所 Coaxial electrically tunable filter of multicavity
CN208062224U (en) * 2018-05-16 2018-11-06 广东圣大电子有限公司 A kind of C-band electricity tune cavity body filter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020080796A1 (en) * 2018-10-15 2020-04-23 주식회사 케이엠더블유 Cavity filter

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