CN110146870A - Portable radar signal modulator based on phase modulation surface - Google Patents
Portable radar signal modulator based on phase modulation surface Download PDFInfo
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- CN110146870A CN110146870A CN201910428860.8A CN201910428860A CN110146870A CN 110146870 A CN110146870 A CN 110146870A CN 201910428860 A CN201910428860 A CN 201910428860A CN 110146870 A CN110146870 A CN 110146870A
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
- F16M11/06—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting
- F16M11/08—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting around a vertical axis, e.g. panoramic heads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/02—Heads
- F16M11/04—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand
- F16M11/06—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting
- F16M11/10—Means for attachment of apparatus; Means allowing adjustment of the apparatus relatively to the stand allowing pivoting around a horizontal axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16M—FRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
- F16M11/00—Stands or trestles as supports for apparatus or articles placed thereon ; Stands for scientific apparatus such as gravitational force meters
- F16M11/20—Undercarriages with or without wheels
- F16M11/24—Undercarriages with or without wheels changeable in height or length of legs, also for transport only, e.g. by means of tubes screwed into each other
- F16M11/26—Undercarriages with or without wheels changeable in height or length of legs, also for transport only, e.g. by means of tubes screwed into each other by telescoping, with or without folding
- F16M11/28—Undercarriages for supports with one single telescoping pillar
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
- G01S13/10—Systems for measuring distance only using transmission of interrupted, pulse modulated waves
- G01S13/26—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave
- G01S13/28—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave with time compression of received pulses
- G01S13/284—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave with time compression of received pulses using coded pulses
- G01S13/288—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave with time compression of received pulses using coded pulses phase modulated
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention relates to a portable radar signal modulator based on a phase modulation surface, which comprises: the signal modulator main body is a phase modulation surface, and the carrying platform main body is a tripod-like structure; the phase modulation surface consists of an active impedance layer, a conductor back plate and a foam medium; the active impedance layer adopts a bow-tie type metal unit, and a BA585 type PIN diode is loaded between two adjacent units; the foam medium is positioned between the active impedance layer and the conductor back plate; the conductor back plate is a metal sheet capable of totally reflecting electromagnetic waves; the tripod-like structure consists of a triangular support frame, a rotating shaft and a rotary telescopic clamp. The invention can adapt to different frequency bands of electromagnetic wave signals; the carrying of a phase modulation surface product can be realized, and the size change can be adapted; the device can be pitched and rotated in all directions in the azimuth direction, and the height adjustment is flexible and controllable; strong reaction to incident electromagnetic wave is not generated; the whole structure is flexible and portable; the product has simple structure; the active radiation of electromagnetic waves can be avoided, and the probability of being detected is reduced.
Description
Technical field
The present invention relates to a kind of portable radar signal modulators based on phase-modulation surface, have small and exquisite portable, property
Can be flexible the features such as, the portable radar signal modulator belongs to radar signal modulating device field.
Background technique
Phase-modulation surface selects surface texture as the particular frequencies that one kind can change reflection of electromagnetic wave characteristic, can
Dynamic controls the characteristic of its proprioceptive reflex electromagnetic echoes.It is by applying phase-modulation to incident electromagnetic wave signal, so that incident
Wave energy redistributes in biggish frequency range, can either realize that target is stealthy, and can generate and force in radar bandwidth
True target, researcher have carried out a large amount of earlier theoretical research, and are gradually carrying out the test of phase-modulation surface and producing
The development of product and verification experimental verification work.(Feng Dejun, Xu Letao, Zhang Ran, Wang Junjie phase-modulation surface radar return are special for document
Journal of Sex Research [J] modern radar, 2018,40 (04): 77-82) by taking linear FM signal as an example, establish echo model and detailed
Analyze the echoing characteristics on phase-modulation surface, analysis the result shows that, for the influence to radar system, phase-modulation surface
With effect similar with interrupted sampling repeater jammer, but simultaneously, it is also equipped with the advantages of some active modes hardly match.?
The stealthy field of target, document (Xie Shaoyi, phase-modulation surface stealth technology research, National University of Defense technology Ph.D. Dissertation) are deep
Enter to have studied the characteristic on phase-modulation surface, and devise the active phase modulation surface test products based on square structure, tests
It has been demonstrate,proved in the excellent performance in stealthy field.
Sufficient card has been obtained in the application feasibility and performance reliability of field of signal modulation in phase-modulation surface
It is bright, but since the manufacturing process on phase-modulation surface will affect the performance of itself to a certain extent, often lead to theoretical point
There is some difference for analysis result and the actual performance of product, therefore particularly critical to the verification experimental verification of phase-modulation surface property.
Under this current demand, the present invention devises kind of the portable general radar signal modulator based on phase-modulation surface, should
Modulator is based on phase-modulation surface, using class tripod structure as supporter, not about relevant test modulator at present
See open report.
Tripod be widely applied as a kind of support construction having good stability, in camera shooting, photography and survey field and
Technology is very mature, and compared to other Process for Heavy Support platforms, tripod has the advantages that light, flexible, stable, portable, at present
Common tripod product can be divided into wooden, high strength plastics material, alloy material, steel material etc. by material point on the market, most
Big pin caliber is substantially between 22mm~32mm, and usual pin caliber is bigger, and the load-bearing of tripod is bigger, and stability is bigger.
In general, the joint number of tripod pipe is differed in 3~5 sections, it can be very convenient according to use demand adjustment length.In view of phase
The lighter in weight of the frequency-selective surfaces structures such as surface is modulated, test products usually its quality is within 5kg, tripod structure foot
To stablize support to it.Therefore the present invention improves tripod structure, is designed to be able to carry changing for phase-modulation surface
Into type tripod structure.
The present invention is devised based on the excellent performance of test demand and three-legged structure to phase-modulation surface property
A kind of portable general radar signal modulator based on phase-modulation surface, the modulator are not only suitable for the side of sizes
Shape (containing square and rectangle) phase-modulation surface product, can any adjustment phase place modulation surface towards angle, while can
It maximally reduces test and carries influence of the modulator to test products performance test, and give full play to phase-modulation surface
Effect, has great importance and market application prospect.
Summary of the invention
The purpose of the present invention is to provide a kind of portable radar signal modulator based on phase-modulation surface, the modulation
The main body of device is the phase-modulation surface test products within the scope of certain size, and can realize that the limited range of test height is adjusted
It is adjusted with the omnidirectional of test direction, it is ensured that phase-modulation surface can realize that many attitude and broadband are effectively adjusted to radar signal
System.
The modulator is using similar trigonometric form structure as support platform, using square plate shape phase-modulation surface as trial body, sufficiently
Phase-modulation surface is played to the modulating action of radar signal, it can be achieved that the comprehensive of radar, multi-pose, wide band signal
Modulation.More specifically, the present invention devises a kind of general purpose radar signal modulator, by phase-modulation surface and class tripod
Structure combines, and tripod structure is modified to carry the general purpose radar signal modulator on phase-modulation surface, is suitable for phase
Position modulation surface size changes in limited range, while the modulator can carry phase-modulation surface in orientation, pitching two
Any angle direction is realized on direction, is realized to the comprehensive of radar, multi-angle, the signal modulation of wide-band.
The present invention mainly includes two big structures: first, be signal modulator main body, i.e. phase-modulation surface；Second, being to take
Carrying platform main body, i.e. class tripod structure.It is specifically described below.
(1) signal modulator main body: phase-modulation surface
Phase-modulation surface is made of active impedance layer, conductor backboard and foam medium three parts.Three's positional relationship with
And principle explanatory diagram, as shown in attached drawing 1a and attached drawing 1b, foam medium plays solid between active impedance layer and conductor backboard
Determine the effect of structure.The active impedance layer on phase-modulation surface can be converted in real time under full resistance and all-pass two states, set
The sine wave that incident electromagnetic wave is unit amplitude, frequency is ω, when active impedance layer is in resistance state entirely, incident electromagnetic wave encounters
Active impedance layer is completely reflected, and is represented by cos (ω t)；In all-pass state, incident electromagnetic wave encounters to be had active impedance layer
It is reflected after conductive surface after source impedance layer, back wave is represented by cos (ω t+2 β d), wherein β=2 π/λ, and λ is freely
Space wavelength.If active impedance layer state (full resistance and all-pass two states) under the control of a certain modulation function is uninterrupted
Change, then transmitting signal will appear as the form by phase-modulation, electromagnetic wave is modulated front and back signal pulse pressure
Result is as shown in attached drawing 2a, b after contracting, from attached drawing as can be seen that after the phase modulated surface modulation of electromagnetic wave signal, reflection echo
There are multiple peak values, realizes the modulation to radar signal.Three component parts on phase-modulation surface are carried out below detailed
Explanation.
(a) active impedance layer
The active impedance layer on phase-modulation surface uses " bow-tie type " metal unit, and adds among two adjacent units
BA585 type PIN diode is carried, changes the electric current by diode, active impedance by way of being biased to total
The cellular construction and overall structure of layer are as shown in attached drawing 3a and attached drawing 3b.
(b) foam medium
Foam medium plays the role of support and separation active impedance layer and conductor backboard, the thickness effect phase of foam medium
The operating center frequency on position modulation surface, specially the thickness of foam medium is with the operating center frequency on phase-modulation surface at anti-
Than even foam medium is thinner, and the operating center frequency on entire phase-modulation surface is higher.That is the thickness of foam medium
Degree can be arbitrarily arranged as needed.
In addition, the dielectric constant of phase-modulation surface requirements foam medium is as close as in 1, to reduce it to electromagnetism
The absorption of wave signal.
(c) conductor backboard
Conductor backboard can be described as metal substrate again, and the work of comprehensive reflection electromagnetic wave is played in phase-modulation surface texture
With, therefore conductor backboard selects the sheet metal that can be totally reflected electromagnetic wave, no other requirements.
To be easy for installation, the length and width of active impedance layer, foam medium and metal backing when making phase-modulation surface
It answers completely the same.
(2) carrying platform main body: class tripod structure
Similar with conventional tripod structure, carrying platform main body of the invention forms as shown in figure 4, this class tripod structure
It mainly consists of three parts, is triangular support bracket, rotary shaft and rotary extension folder respectively.Below to all parts of this modulator
It describes in detail.
The triangular support bracket is for realizing the supporting role to phase-modulation surface, by three support pins and one
Retractable support lever composition.Wherein, three support pins are filled circles column tube, and cylinder pipe diameter is between 2cm~5cm, length
Between 30cm~50cm, and three support pin sizes are identical, and the angle overlooked between three pins downwards is
120°；Retractable supports pipe is made of 4 section hollow cylindrical tubes, and for the stability for guaranteeing triangular support bracket, design uses bottom
Radius maximum, the length longest of hollow cylindrical tube, radius minimum, the shortest principle of length of the top hollow cylindrical tube, guarantee
Retractable support lever total length is between 30cm~120cm.Triangular support bracket detail view is as shown in Fig. 5.
The rotary shaft can rotate in the horizontal direction for connecting triangular support bracket and rotary extension folder, rotary shaft
360 °, pitching angular direction rotates 180 °.
The rotary extension folder can scheme for the square plates infrastructure products such as stationary phase modulation surface, rotary extension folder
O point is to be rotated by 360 ° in rotary shaft pitch orientation in 4, and Fig. 6 gives the detail of rotary extension folder, and rotary extension folder is by can
Telescopic Fixed folder, small rotary shaft composition.Scalable fixing clamp transverse direction regular length 30cm, Extensible 0cm~30cm, it is longitudinal
Regular length 30cm；Small axle support section is rotated using solid cylinder structure, and length, radius can be adjusted according to the actual situation.?
The one of side length of square products that rotating telescopic clamp under the above parameter designing can carry is up to 60cm.
To avoid the carrying platform of modulator from influencing phase-modulation surface property, the material of class tripod structure selects height
Strong matter plastics, all components are avoided in the production process using metal.Because the performance test on phase-modulation surface is to receive
The electromagnetic wave amount for arriving and reflecting is measurement standard, and the excess metal in class tripod structure can will cause electromagnetic wave strongly instead
It penetrates, measurement is caused to introduce error, therefore the material of the class tripod structure of the modulator in the present invention selects high-strength matter plastics, with
Do not influence incoming signal echo for judge whether selectable foundation.
The effect and advantage that the present invention can reach are:
(1) different frequencies of electromagnetic wave signal be can adapt to by the way that the thickness of phase-modulation surfactant foam medium is adjusted flexibly
Section, has wide range of applications.
(2) it can be realized the carrying to phase-modulation surface product, and be suitable for its size and change in limited range, have
There is certain versatility；
(3) can pitching, orientation all-directional rotation, realize the comprehensive measurement to product performance in different positions, together
When height adjustment it is flexibly controllable；
(4) using the work of high-strength matter plastics, kickback will not be generated to incident electromagnetic wave, avoided to phase-modulation surface
The influence of properties of product test；
(5) the modulator overall structure is flexibly portable, it is ensured that phase-modulation surface can realize many attitude to radar signal
It is effectively modulated with broadband；
(6) product structure is simple, at low cost, and can move at any time, and flexibility is good, is suitble to the use of various scenes.
(7) modulator can be avoided active radiated electromagnetic wave, reduce detected probability.
Detailed description of the invention
Fig. 1 a phase-modulation surface texture front view；
Fig. 1 b phase-modulation surface principle explanatory diagram
The electromagnetic wave signal pulse compression result figure of the not phase modulated surface modulation of Fig. 2 a；
The electromagnetic wave signal pulse compression result figure of the phase modulated surface modulation of Fig. 2 b；
The cellular construction of Fig. 3 a active impedance layer
The overall structure of Fig. 3 b active impedance layer
Fig. 4 carrying platform agent structure schematic diagram；
Fig. 5 class triangular support bracket structure and scale diagrams；
Fig. 6 rotatable flexible presss from both sides scale diagrams；
Active impedance layer schematic diagram of the Fig. 7 having a size of 30cm × 30cm；
Fig. 8 is incoming signal and the signal spectrum reflected through this modulator
Figure label is as follows:
1, active impedance layer 11, metal unit 12, PIN diode
2, foam medium 3, conductor backboard
A, triangular support bracket B, rotary shaft C, rotary extension folder
A, support pin b, retractable support lever c, scalable fixing clamp e, small rotary shaft
Specific embodiment
In the following with reference to the drawings and specific embodiments, the following further describes the technical solution of the present invention.One kind being based on phase
The portable radar signal modulator on position modulation surface, including signal modulation main body and carrying platform main body:
(1) signal modulator main body: phase-modulation surface
Phase-modulation surface is three-decker in design, from top to bottom respectively active impedance layer 1,2 and of foam medium
Conductor backboard 3, specific embodiment is as follows.
Active impedance layer 1 using " bow-tie type " metal unit, and loads BA585 type PIN among two adjacent units
Diode changes the electric current by diode by way of being biased to total；Its cellular construction size such as attached drawing
Shown in 3a, overall structure is having a size of 30cm × 30cm, according to bow-tie type metal unit structure (material is copper) size and whole knot
Structure size may include 19 (row) × 20 (column)=380 bow-tie type metal units and 18 (row) × 20 (column)=360 two thereon
Pole pipe, active impedance layer structure chart is as shown in Fig. 7 under this embodiment.
Foam medium 2 plays the role of support and separation active impedance layer 1 and conductor backboard 3, and foam is situated between in the present embodiment
Matter uses PVC (polyvinyl chloride) cystosepiment, cystosepiment relative dielectric constant er< 1.2, thickness 0.3cm, size 30cm ×
30cm, in light yellow, texture is too hard.
Conductor backboard 3 selects FR4 copper-clad plate in the present embodiment, identical as " bow-tie type " metal unit material, belongs to copper
Piece, can fully reflective electromagnetic wave, size 30cm × 30cm, thickness is negligible.
(2) carrying platform main body: class tripod structure
The following table 1 gives a kind of specific design side of phase-modulation surface universal test modulator based on tripod structure
Case.
Table 1
As it can be seen from table 1 influencing the factor of the modulator function mainly has:
(a) size of triangular support bracket A influences the height of the modulator and can carry the quality of product, triangular support bracket
Size it is bigger, test products can be carried to higher height, while the radius of support pin more big structure is more stable.
(b) direction that the performance of small rotary shaft e directly influences modulator in rotary shaft B and rotary extension folder C adjusts energy
Power can be generally designed as needed.
(c) size of rotary extension folder C influences the size range for being suitable for product.The adaptability of rotary extension folder is got over
By force, general effect is better.
This programme only gives one group of feasible carrying platform Design of Main Structure scheme, and user can adjust as needed
Relative dimensions make the modulator have greater flexibility.
The signal spectrum that attached drawing 8 gives incoming signal and reflects through this modulator, wherein incoming signal is centre frequency
fc=10GHz, pulsewidth TpThe linear FM signal of=10us, signal bandwidth B=50MHz；Modulated signal is that duty ratio is 0.5
Periodic Rectangular square wave, frequency modulating signal 5MHz；Foam medium is with a thickness of 7.5mm；Other parameter settings are the same as the " specific of this patent
Embodiment ".It can be seen from the figure that after based on phase-modulation surface signal modulator, due to phase-modulation surface pair
Radar signal, which is applied with phase, to be caused, and echo-signal frequency spectrum shift is caused, and finally causes echo-signal spectral aliasing, so that entirely
The frequency spectrum of echo-signal is completely fuzzy, plays modulation effect.
Claims (5)
1. a kind of portable radar signal modulator based on phase-modulation surface, it is characterised in that: the modulator specifically includes that
Signal modulator main body, that is, phase-modulation surface and carrying platform main body, that is, class tripod structure；It is specific as follows:
Phase-modulation surface is made of active impedance layer, conductor backboard and foam medium three parts；Active impedance layer uses " knot
Type " metal unit, and BA585 type PIN diode is loaded among two adjacent units；Foam medium is located at active impedance layer
Between conductor backboard, plays the role of fixed structure and adjust frequency modulating signal；Conductor backboard can be described as metal substrate again,
Play the role of comprehensive reflection electromagnetic wave in phase-modulation surface texture, conductor backboard selects the gold that can be totally reflected electromagnetic wave
Belong to thin slice；
Class tripod structure mainly consists of three parts, and is triangular support bracket, rotary shaft and rotary extension folder respectively；Described three
Angle support frame is for realizing the supporting role to phase-modulation surface, by three support pins and a retractable support lever group
At retractable supports pipe is made of 4 section hollow cylindrical tubes；The rotation axis connection triangular support bracket and rotary extension folder, rotation
Shaft can be rotated by 360 ° in the horizontal direction, and pitching angular direction rotates 180 °；The rotary extension folder is modulated for stationary phase
Surface, rotary extension folder can be to be rotated by 360 ° in pitch orientation, and rotary extension folder is made of scalable fixing clamp, small rotary shaft.
2. a kind of portable radar signal modulator based on phase-modulation surface according to claim 1, feature exist
In: the thickness of the foam medium and the operating center frequency on phase-modulation surface are inversely proportional, and even foam medium is thinner, entirely
The operating center frequency on phase-modulation surface is higher.
3. a kind of portable radar signal modulator based on phase-modulation surface according to claim 1, feature exist
In: the dielectric constant of the foam medium close to 1.
4. a kind of portable radar signal modulator based on phase-modulation surface according to claim 1, feature exist
In: the material of the class tripod structure selects high-strength matter plastics.
5. a kind of portable radar signal modulator based on phase-modulation surface according to claim 1, feature exist
It is completely the same in the length and width of the active impedance layer on: the phase-modulation surface, foam medium and conductor backboard.
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| CN201910428860.8A CN110146870A (en) | 2019-05-22 | 2019-05-22 | Portable radar signal modulator based on phase modulation surface |
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| CN201910428860.8A CN110146870A (en) | 2019-05-22 | 2019-05-22 | Portable radar signal modulator based on phase modulation surface |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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