CN103594763B - There is the frequency selective surface filter of memory function - Google Patents
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Abstract
The invention discloses a kind of frequency selective surface filter with memory function, belong to microwave technical field.Solving prior art median filter prepares loaded down with trivial details, needs external circuits, and the resonance characteristic of frequency-selective surfaces periodic unit is easily destroyed, and the technical problem of the material contamination environment selected.Filter of the present invention comprises frequency-selective surfaces and temperature controlling instruments, frequency-selective surfaces comprises metal level and periodic unit, periodic unit is by flap-type structure, columnar structures and establish through hole on the metal layer to form, described flap-type structure is connected with the inwall of through hole by columnar structures, and the material of columnar structures is the marmem with double process shape-memory effect.Filter of the present invention can select surface to make it present different periodic units by control frequency according to demand, both the passband frequency conversion of filter can have been realized, the passband open and close that also can realize filter are controlled, and structure is simple, safety and environmental protection in preparation and use procedure.
Description
Technical field
The present invention relates to a kind of frequency selective surface filter with memory function, belong to microwave technical field.
Background technology
Frequency-selective surfaces (Frequency Selective Surface, FSS) be a kind of periodic array in two dimensions structure be made up of the perforate unit of periodic arrangement on the metal patch unit of periodic arrangement or metal screen, it can make electromagnetic wave, at resonance frequency place, total reflection or total transmissivity occur, and is therefore a kind of spatial filter wave frequency being had to selection index system.
FSS has a wide range of applications in microwave regime as band pass filter.As the dichroism subreflector adopting FSS to prepare Cassegrain antenna, the feed of two different frequencies can be made to share same reflecting surface, save system space; Use FSS technology to prepare radome, the outer RCS of band of flight weapons antenna can be reduced, thus realize radar invisible function; Using the wall of FSS structure as building or the interlayer of door and window, the electromagnetic transmission of special frequency channel can be realized, and shield the signal of other frequency ranges.
But after prepared by the said goods, the band-pass filtering property utilizing FSS to realize just cannot change.For card match Glenn system, dichroism subreflector cannot adapt to different feeds according to demand; The situation that faced by existing FSS radome, enemy's detection radar is identical with one's own side's guidance radar frequency range, loses stealthy function because shielding this frequency range electromagnetic wave; And shielded enclosure can not realize change or the full frequency band shielding of communication channel according to actual needs.This limitation makes existing FSS be difficult to practical requirement in the application as spatial filter.
Publication number is the Chinese patent of 103094647A, disclose a kind of double-layer frequency selective surfaces filter with frequency conversion function, this filter adopts barium strontium titanate as the intermediate course of double-deck FSS band pass filter, by the metal level of FSS, electric field is applied to interlayer, the dielectric constant of barium strontium titanate sandwich material is changed, the change of this band pass filter bandpass center frequency can be realized, namely realize the frequency conversion function of passband; Publication number is the Chinese patent of 103022602A, disclose a kind of spatial filter with switching function, the mixture that this filter adopts conducting polymer and solid electrolyte to form is as the intermediate course of double-deck FSS band pass filter, by the metal level of FSS, electric field is applied to mixture interlayer, control sandwich material to change between conductor and insulator, He Ne laser function or the full frequency band shielding of this double-deck FSS band pass filter can be realized, namely realize the function that passband open and close are controlled.But the sandwich material preparation process of above two kinds of filters is more loaded down with trivial details, and filter needs external circuits, and will prepare electrode on FSS metal level, and this can have an impact to the resonance characteristic of FSS unit simultaneously.Based on above-mentioned several reason, these two kinds of FSS filters are made to there is not convenient factor in preparation with in using.
Publication number is the Chinese patent of 102709625A, disclose a kind of filter with the thick screen frequency-selective surfaces of frequency conversion function, this filter inlays optical semiconductor sensing device in the seam of the hole of FSS figure, when the light of varying strength is radiated on light-sensitive device, the impedance of device can change, and then realizes the object of resonance frequency change.But in actual fabrication process, optical semiconductor sensing device needs to be welded in the gap of FSS graphic element, pad can have an impact to the resonance characteristic of FSS unit, and if the resonance frequency of filter is very high, then the size of periodic unit will be very little, cause great difficulty can to welding device, this becomes the drawback of this filter in reality preparation and operation.
Publication number is the Chinese patent of 103346366A, disclose a kind of spatial filter adopting thermal induced phase transition material to prepare, publication number is the Chinese patent of 103346367A, disclose the spatial filter that a kind of serviceability temperature controls transmission band switch, above two kinds of FSS filters adopting the thermal induced phase transition materials such as vanadium dioxide to prepare, the temperature of thermal induced phase transition material is changed by temperature regulating device, can realize controlling thermal induced phase transition material and carry out reversible transformation between conductor and insulator, and then realize band pass filter passband and open, close controlled target, also the function of electromagnetic wave all-pass or gating can be realized.But vanadium dioxide is a kind of poisonous chemical substance, irritant to human body skin, also can pollute environment, and this is the defect of this type of filter simultaneously.
Summary of the invention
The object of the invention is to solve prior art median filter prepares loaded down with trivial details, and need external circuits, the resonance characteristic of FSS unit is easily destroyed, and the technical problem of the material contamination environment selected, a kind of frequency selective surface filter with memory function is provided.
The frequency selective surface filter with memory function of the present invention, comprising: frequency-selective surfaces and temperature controlling instruments; Described frequency-selective surfaces comprises the periodic unit of periodic arrangement on metal level and metal level; Described periodic unit is made up of through hole, flap-type structure and columnar structures, described through hole is established on the metal layer, the two ends of described columnar structures are fixedly connected with the inwall of through hole with the outer wall of flap-type structure respectively, described columnar structures adopts marmem to make, columnar structures has double process shape-memory effect, and can be changed the relative position relation of flap-type structure and through hole by double process shape-memory effect; Described temperature controlling instruments controls the temperature of columnar structures, and does not affect the effect of microwave to frequency-selective surfaces.
Further, the material of described metal level and flap-type structure is marmem.
Further, described marmem is copper zinc-aluminium nickel (Cu-Zn-Al-Ni) alloy, titanium nickel (Ti-Ni) alloy, copper aluminium nickel (Cu-Al-Ni) alloy, copper zinc-tin (Cu-Zn-Sn) alloy or ferrimanganic silicon (Fe-Mn-Si) alloy.
Further, described temperature controlling instruments is arranged on the side of frequency-selective surfaces.
Further, described through hole and flap-type structure are similar figures.
Further, described through hole is circular hole, and described flap-type structure is disk.
Further, the double process shape-memory effect that described columnar structures has makes flap-type structure be that rotating shaft rotates with columnar structures, and the angle of flap-type structure place plane and through hole place plane can be 60 ° and 10 °.
Further, the double process shape-memory effect that described columnar structures has makes flap-type structure away from through hole place plane, and the angle of flap-type structure place plane and through hole place plane can be 65 ° and 8 °.
Operation principle:
Marmem becomes a kind of shape when high-temperature-phase, be designated as high-temperature-phase shape, another kind of shape is deformed into when low-temperature phase, be designated as low-temperature phase shape, high-temperature-phase shape can be reverted to when heating again, and low-temperature phase shape when again cooling, can be reverted to, namely can follow that the lifting of temperature is spontaneous reversibly recovers high and low temperature phase shape repeatedly.The columnar structures of filter of the present invention adopts marmem preparation, there is double process shape-memory effect, difformity is remembered when high temperature and low temperature, and then the relative position of related flap-type structure and through hole changes, make frequency-selective surfaces periodic unit present difformity when high temperature and low temperature, and then realize the change of band pass filter center frequency point, be i.e. the frequency conversion function of passband, also band pass filter He Ne laser or full frequency band shielding can be realized, the function that namely passband open and close are controlled.
Beneficial effect of the present invention:
The frequency selective surface filter with memory function of the present invention can remember difform periodic unit, therefore can surface be selected to make it present different periodic unit shapes by control frequency according to demand, both the function that band pass filter center frequency point changes can have been realized, namely the passband frequency conversion of band pass filter is realized, also the function of He Ne laser or full frequency band shielding can be realized according to demand, namely the passband realizing band pass filter is opened, close controlled, and structure is simple, preparation is with operation is very easy, safety and environmental protection in preparation and use procedure, improve frequency-selective surfaces as the practical application of spatial filter and reliability.
Accompanying drawing explanation
Fig. 1 is the perspective view that the present invention has the frequency selective surface filter of memory function;
Fig. 2 is the frequency selective surface filter that the present invention has memory function, the structural representation of periodic unit when machining completes;
Fig. 3 is the end view of Fig. 2;
Fig. 4 is the frequency selective surface filter that the present invention has memory function, and when realizing the passband frequency conversion function of band pass filter, periodic unit is in the perspective view of low-temperature phase;
Fig. 5 is the end view of Fig. 4;
Fig. 6 is the frequency selective surface filter that the present invention has memory function, and when realizing the passband frequency conversion function of band pass filter, periodic unit is in the perspective view of high-temperature-phase;
Fig. 7 is the end view of Fig. 6;
Fig. 8 is the frequency selective surface filter that the present invention has memory function, when realizing the passband frequency conversion function of band pass filter, aligns the transmission characteristic comparison diagram of incident electromagnetic wave;
Fig. 9 is the frequency selective surface filter that the present invention has memory function, and when realizing the passband open and close controllable function of band pass filter, periodic unit is in the perspective view of low-temperature phase;
Figure 10 is the end view of Fig. 9;
Figure 11 is the frequency selective surface filter that the present invention has memory function, and when realizing the passband open and close controllable function of band pass filter, periodic unit is in the perspective view of high-temperature-phase;
Figure 12 is the end view of Figure 11;
Figure 13 is the frequency selective surface filter that the present invention has memory function, when realizing the passband open and close controllable function of band pass filter, aligns the transmission characteristic comparison diagram of incident electromagnetic wave.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As Figure 1-3, have the FSS filter of memory function, comprising: FSS and temperature controlling instruments 3, temperature controlling instruments 3 is positioned at the one or both sides of FSS, does not affect the irradiation of microwave to FSS, FSS comprises the periodic unit 2 of periodic arrangement on metal level 1 and metal level 1, periodic unit 2 is by through hole 4, flap-type structure 5 and columnar structures 6 form, through hole 4 is located on metal level 1, the size of flap-type structure 5 is less than through hole 4, can be placed in through hole 4, one end of columnar structures 6 is fixedly connected with the outer wall of flap-type structure 5, the other end of columnar structures 6 is fixedly connected with the inwall of through hole 4, the material of columnar structures 6 is marmem, marmem can remember different shapes at low-temperature phase and high-temperature-phase, columnar structures 6 is made to have double process shape-memory effect, the double process shape-memory effect that columnar structures 6 has can change the relative position relation of flap-type structure 5 and through hole 4 according to the change of temperature, and then the shape of periodic unit 2 is changed, the passband frequency conversion function or the passband that realize band pass filter are opened, close controllable function, temperature controlling instruments 3 controls the temperature of columnar structures 6, the temperature of columnar structures 6 is made to raise or reduce by heating or freezing.
In present embodiment, the double process shape-memory effect that columnar structures 6 has makes columnar structures 6 and through hole 4 be in same plane, and flap-type structure 5 with columnar structures 6 for rotating shaft rotates, during high-temperature-phase, the angle of flap-type structure 5 place plane and through hole 4 place plane is 10 °, during low-temperature phase, the angle of flap-type structure 5 place plane and through hole 4 place plane is 60 °, along with the change of temperature between high-temperature-phase and low-temperature phase of columnar structures 6, the angle of flap-type structure 5 place plane and through hole 4 place plane changes between 10 °-60 °.
In present embodiment, when the double process shape-memory effect that columnar structures 6 has makes flap-type structure 5 away from through hole 4 place plane, during high-temperature-phase, the angle of flap-type structure 5 place plane and through hole 4 place plane is 8 °, during low-temperature phase, the angle of flap-type structure 5 place plane and through hole 4 place plane is 65 °, and along with the change of temperature between high-temperature-phase and low-temperature phase of columnar structures 6, the angle of flap-type structure 5 place plane and through hole 4 place plane changes between 8 °-65 °.
In present embodiment, for making processing easier, preferred metal layers 1 and flap-type structure 5 are also marmem, and metal level 1 is identical with flap-type structure 5 thickness, columnar structures 6, metal level 1 and flap-type structure 5 disposal molding.
In the present invention, marmem can be copper zinc-aluminium nickel alloy, Ti-Ni alloy, Batterium, Jackson's alloy or FeMnSi alloy, and present embodiment adopts copper zinc-aluminium nickel alloy.
In the present invention, through hole 4 and flap-type structure 5 are similar figures, when through hole 4 and flap-type structure 5 are at same plane, through hole 4 and flap-type structure 5 have same central point, can be through hole 4 are circular hole, and flap-type structure 5 is disk, can be through hole 4 be square opening, flap-type structure 5 is square plate, can be through hole 4 is Y shape hole, and flap-type structure 5 is Y shape sheet, can also be through hole 4 be cruciform vent, flap-type structure 5 is cross sheet, and present embodiment adopts through hole 4 to be circular hole, and flap-type structure 5 is disk.
In present embodiment, columnar structures 6 adopts cylinder.
In the present invention, temperature controlling instruments 3 can be Cooling and heating blower or air conditioner, and present embodiment adopts Cooling and heating blower.
The preparation of the filter of present embodiment comprises the shaping and shape memory training of FSS machining.
If only have columnar structures 6 to adopt marmem to prepare, metal level 1 and flap-type structure 5 adopt the good conductor machine-shapings such as copper, then the shaping step of the machining of the FSS of filter is as follows:
Step one, prepare cylinder
Select cathode copper, No. 0 zinc, No. 00 aluminium and electrolytic nickel is raw material, through intermediate frequency furnace melting, smelting temperature is 1250 DEG C, pour method in employing bag and add lanthanum cerium compound rare-earth fining agent RE (La+Ce), the mass fraction of each element is, zinc: 25.7%, aluminium: 3.8%, nickel: 0.8%, compound rare-earth: 0.08%, all the other are copper; Then casting ingot-forming, is heated to 850 DEG C of insulation 24h and cools with stove, cut and remove epidermis, then ingot is carried out hot rolling and cold rolling 850 DEG C time after insulation 30min; The mode of numerical controlled machinery processing is adopted to prepare cylinder, the diameter phi of cylinder
3=0.5mm, the length L=1.8mm of cylinder;
Step 2, prepare circular hole and disk
The mode of numerical controlled machinery processing is adopted on the copper coin of thickness d=2mm, to prepare the circular hole unit of arranging by the square cycle, cycle T=15mm, the diameter phi of circular hole
1=12mm, namely obtains metal level 1; The mode of numerical controlled machinery processing is adopted to prepare thickness d=2mm, diameter phi
2the circular copper paster of=10.4mm; The mode of numerical controlled machinery processing is adopted to prepare cylindrical hole respectively, the diameter phi in hole in the central authorities of circular-hole internal-wall and the central authorities of disk outer wall
4=0.496mm, the degree of depth h=0.5mm in hole.
Step 3, employing elastic conjunction, be assembled together cylinder, disk and metal level 1
The metal level 1 processed and disk are immersed after being incubated 60min in the silicone oil of 300 DEG C and take out, the two ends of cylinder are inserted respectively in the aperture of circular-hole internal-wall and disk outer wall, and keep disk in the middle of the plane of metal level 1, after the temperature of metal level 1 and disk is down to room temperature, cylinder is connected with circular patch by circular hole, so far completes the preparation of FSS.
If metal level 1, flap-type structure 5 and columnar structures 6 are marmem, then the shaping step of the machining of the FSS of filter is as follows:
Select cathode copper, No. 0 zinc, No. 00 aluminium and electrolytic nickel is raw material, through intermediate frequency furnace melting, smelting temperature is 1250 DEG C, pour method in employing bag and add lanthanum cerium compound rare-earth fining agent RE (La+Ce), the mass fraction of each element is, zinc: 25.7%, aluminium: 3.8%, nickel: 0.8%, compound rare-earth: 0.08%, all the other are copper; Then casting ingot-forming, is heated to 850 DEG C of insulation 24h and cools with stove, cut and remove epidermis, then ingot is rolled into 3mm sheet material after insulation 30min 850 DEG C time, then be cold-rolled to 2mm, obtain metal level 1; Adopt the surperficial disposal molding manufacturing cycle unit 2 of mode at metal level 1 of numerical controlled machinery processing, its structure as shown in Figure 2, arrange by the square cycle in metal level 1 plane, unit cycle T=15mm, the diameter phi of circular hole by periodic unit 2
1=12mm, with the disk diameter phi of circular hole concentric
2=10.4mm, connects the body diameter φ of disk and circular hole
3=0.5mm, the thickness d=2mm of circular hole and disk; So far the preparation of FSS is completed.
The columnar structures 6 of filter is made to have the method for double process shape-memory effect:
Step one, determine the phase transition temperature of exemplar, i.e. low-temperature phase temperature and high-temperature-phase temperature
By FSS at 850 DEG C of insulation 25min, in room temperature of quenching machine oil, then put into 150 DEG C of machine oil and be incubated 25min, finally in 50 DEG C of water, be incubated 15min; After heat treatment, obtain the phase transition temperature of exemplar, during heating, low-temperature phase is to the beginning temperature A of high-temperature phase-transitional
sbe 59 DEG C, low-temperature phase is A to the end temp of high-temperature phase-transitional
fit is 71 DEG C; The beginning temperature M that during cooling, high-temperature-phase changes to low-temperature phase
sbe 65 DEG C, the end temp M that high-temperature-phase changes to low-temperature phase
fbe 51 DEG C, determine that its high-temperature-phase temperature is more than 71 DEG C, low-temperature phase temperature is less than 51 DEG C;
Step 2, temperature controlling instruments 3 is placed in the side of FSS, is 0.15 meter with the distance at FSS edge, the temperature of cylinder can be controlled as required, and do not affect the irradiation of microwave to FSS;
Step 3, shape memory training is carried out to exemplar
Filter for passband frequency conversion function can be realized:
Cylinder is heated to the high-temperature-phase of 80 DEG C, cylinder and circular hole are in same plane, and be that rotating shaft rotary wafer carries out restrained deformation to periodic unit 2 with cylinder, and keep restrained condition cylinder to be cooled to the low-temperature phase of 40 DEG C, remove constraint, obtain low-temperature phase shape, as shown in Figure 4 and Figure 5, low-temperature phase shape is disk place plane and plane included angle, circular hole place is θ
1=60 ° (by described technical field technical staff common practise, for ensureing θ
1angle, consider the rebound effect of metal, when restrained deformation, overflow method can be adopted to compensate springback angle, and by carrying out experiment repeatedly and correction, ensure the accuracy of angle); Cylinder is heated to the high-temperature-phase of 80 DEG C again, obtains high-temperature-phase shape, as shown in Figure 6 and Figure 7, high-temperature-phase shape is the angle theta of disk place plane and circular hole place plane
2=10 °; Utilize temperature controlling instruments 3 pairs of cylinders to carry out intensification cooling, the process 15 times of above-mentioned steps three, makes cylinder possess double process shape-memory effect repeatedly.
Filter for passband open and close controllable function can be realized:
Cylinder is heated to the high-temperature-phase of 80 DEG C, cylinder is in the plane at circular hole place, do the vertical line of cylinder in circular hole plane by cylinder mid point, disk place plane rotates for rotating shaft with the direction of this vertical line, makes disk leave circular hole place plane, restrained deformation is carried out to periodic unit 2, and keep restrained condition cylinder to be cooled to the low-temperature phase of 40 DEG C, remove constraint, obtain low-temperature phase shape, as shown in Figure 9 and Figure 10, low-temperature phase shape is the angle ω of disk place plane and circular hole place plane
1=65 ° (by described technical field technical staff common practise, for ensureing ω
1angle, consider the rebound effect of metal, when restrained deformation, excessive bending method can be adopted to compensate springback angle, and by carrying out experiment repeatedly and correction, ensure the accuracy of angle); Cylinder is heated to the high-temperature-phase of 80 DEG C again, obtains high-temperature-phase shape, as is illustrated by figs. 11 and 12, high-temperature-phase shape is the angle ω of disk place plane and circular hole place plane
2=8 °; Utilize temperature controlling instruments 3 pairs of cylinders to carry out intensification cooling, the process 15 times of above-mentioned steps three, makes cylinder possess double process shape-memory effect repeatedly.
Carry out measuring transmission loss to the filter realizing frequency conversion function, as shown in Figure 8, when cylinder temperature is higher than 80 DEG C, when being namely in high-temperature-phase, periodic unit 2 is the angle theta of disk place plane and circular hole place plane to result
2the shape of=10 °, filter passband center frequency point is 8.6GHz, and transmitance is-0.11dB; When temperature controlling instruments 3 discharge cold air make cylinder temperature lower than 40 DEG C time, when being namely in low-temperature phase, periodic unit 2 changes the angle theta of disk place plane and circular hole place plane into
1the shape of=60 °, filter passband center frequency point is 13.7GHz, and transmitance is-0.14dB; When temperature controlling instruments 3 discharge hot gas make cylinder temperature again higher than 80 DEG C time, be namely in high-temperature-phase state, periodic unit 2 changes the angle theta of disk place plane and circular hole place plane again into
2the shape of=10 °, filter passband center frequency point is 8.6GHz, and transmitance is-0.11dB.By changing the temperature of cylinder, realize the frequency conversion function controlling this filter passband.
Carry out measuring transmission loss to the filter realizing the controlled energy of passband open and close merit, as shown in figure 13, when cylinder temperature is higher than 80 DEG C, when being namely in high-temperature-phase, periodic unit 2 is the angle ω of disk place plane and circular hole place plane to result
2the shape of=8 °, filter passband is open state, and center frequency point is 8.6GHz, and transmitance is-0.35dB, has good filtering characteristic; When temperature controlling instruments 3 discharge cold air make cylinder temperature lower than 40 DEG C time, when being namely in low-temperature phase, periodic unit 2 changes the angle ω of disk place plane and circular hole place plane into
1the shape of=65 °, this filter passband is off status, and filter can realize the electromagnetic wave shielding characteristic of wide-band, and within the scope of 2GHz ~ 16GHz, transmitance is all lower than-15dB; When temperature controlling instruments 3 discharge hot gas make cylinder temperature again higher than 80 DEG C time, not only but also be in high-temperature-phase state, periodic unit 2 changes the angle ω of disk place plane and circular hole place plane again into
2the shape of=8 °, this filter passband is open state, and center frequency point is 8.6GHz, and transmitance is-0.35dB, again realizes filter function.By changing the temperature of cylinder, the function controlling these filter passband open and close can be realized, namely realizing the function of electromagnetic He Ne laser or wide-band shielding.
Claims (8)
1. there is the frequency selective surface filter of memory function, it is characterized in that, comprising: frequency-selective surfaces and temperature controlling instruments (3);
Described frequency-selective surfaces comprises the periodic unit (2) of metal level (1) and the upper periodic arrangement of metal level (1);
Described periodic unit (2) is made up of through hole (4), flap-type structure (5) and columnar structures (6), described through hole (4) is located on metal level (1), the two ends of described columnar structures (6) are fixedly connected with the inwall of through hole (4) with the outer wall of flap-type structure (5) respectively, described columnar structures (6) adopts marmem to make, columnar structures (6) has double process shape-memory effect, and can be changed the relative position relation of flap-type structure (5) and through hole (4) by double process shape-memory effect;
Described temperature controlling instruments (3) controls the temperature of columnar structures (6), and does not affect the effect of microwave to frequency-selective surfaces.
2. the frequency selective surface filter with memory function according to claim 1, is characterized in that, the material of described metal level (1) and flap-type structure (5) is marmem.
3. the frequency selective surface filter with memory function according to claim 1 and 2, is characterized in that, described marmem is copper zinc-aluminium nickel alloy, Ti-Ni alloy, Batterium, Jackson's alloy or FeMnSi alloy.
4. the frequency selective surface filter with memory function according to claim 1 and 2, is characterized in that, described temperature controlling instruments (3) is arranged on the side of frequency-selective surfaces.
5. the frequency selective surface filter with memory function according to claim 1 and 2, is characterized in that, described through hole (4) and flap-type structure (5) are similar figures.
6. the frequency selective surface filter with memory function according to claim 5, is characterized in that, described through hole (4) is circular hole, and described flap-type structure (5) is disk.
7. the frequency selective surface filter with memory function according to claim 1 and 2, it is characterized in that, the double process shape-memory effect that described columnar structures (6) has makes flap-type structure (5) with columnar structures (6) for rotating shaft rotates, and the angle of flap-type structure (5) place plane and through hole (4) place plane can be 60 ° and 10 °.
8. the frequency selective surface filter with memory function according to claim 1 and 2, it is characterized in that, the double process shape-memory effect that described columnar structures (6) has makes flap-type structure (5) away from through hole (4) place plane, and the angle of flap-type structure (5) place plane and through hole (4) place plane can be 65 ° and 8 °.
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| CN111910154B (en) * | 2020-07-29 | 2022-08-02 | 华中科技大学 | Dynamic frequency selection surface structure and preparation method thereof |
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| CN103346367A (en) * | 2013-06-24 | 2013-10-09 | 中国科学院长春光学精密机械与物理研究所 | Spatial filter with temperature control transmission band switch |
| CN103346366A (en) * | 2013-06-24 | 2013-10-09 | 中国科学院长春光学精密机械与物理研究所 | Spatial filter prepared through heating-induced phase transition material |
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