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Ultra-high frequency (UHF) radar frequency spectrum shifting method of frequency selective surface (FSS)-based multi-layer reflective modulation plate

A multi-layer reflection and spectrum shifting technology, applied in the direction of electrical components, antennas, etc., can solve the problems that the reflection state cannot be dynamically changed, and the single-layer reflection structure cannot be realized by an equivalent circuit, so as to achieve spectrum shifting, ideal absorbing ability, Realize the effect of two-phase constant modulus modulation

Inactive Publication Date: 2018-01-09
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

The single-layer reflective structure cannot be realized with a simple equivalent circuit, nor can it dynamically change the reflective state

Method used

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  • Ultra-high frequency (UHF) radar frequency spectrum shifting method of frequency selective surface (FSS)-based multi-layer reflective modulation plate
  • Ultra-high frequency (UHF) radar frequency spectrum shifting method of frequency selective surface (FSS)-based multi-layer reflective modulation plate
  • Ultra-high frequency (UHF) radar frequency spectrum shifting method of frequency selective surface (FSS)-based multi-layer reflective modulation plate

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Embodiment Construction

[0025] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] The reflective modulation plate designed by the present invention adopts a multi-layer structure, which is composed of the first layer of frequency selective surface, the second layer of spacer layer, and the third layer of grounding layer. Its structure is as follows figure 1 shown.

[0027] Suppose a phase modulation surface is composed of an active impedance layer (impedance adjustable), a metal backplane and a dielectric layer with a thickness d, the state diagram is as follows figure 2 shown. The impedance of the active layer can switch between various impedance states according to external control signals. Considering an ideal situation, the controllable active layer is switched between completely transparent (R=∞) and completely reflective (R=0) states. When the center frequency is f c When the plane wave of unit intensit...

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Abstract

The invention relates to an ultra-high frequency (UHF) radar frequency spectrum shifting method of a frequency selective surface (FSS)-based multi-layer reflective modulation plate, and belongs to thetechnical field of electromagnetic field microwave. By means of electromagnetic characteristic controllability of an electromagnetic metamaterial, an FSS-based three-layer structured reflective modulation plate is designed, dynamic conversion of a transient characteristic impedance state is achieved, so that the electromagnetic characteristic such as margin and phase of a low-frequency radar incident wave and a reflective wave direction are changed, and the problem of frequency spectrum shift of an UHF radar incident wave and receiver signal detection are solved. The three-layer reflective modulation plate is designed on the basis of FSS, conversion between a high-impedance state and a low-impedance state of a surface of an active layer is controlled, and two-phase constant-mode modulation of the radar incident signal is achieved; and meanwhile, based on a transmission line principle, an equivalent circuit of an adjustable reflective modulation plate is designed and has ideal wave absorption capability, and frequency spectrum shift of the UHF frequency radar signal is achieved.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic fields and microwaves, and relates to a UHF radar spectrum shifting method based on an FSS multilayer reflection modulation board. Background technique [0002] UHF (Ultra-High Frequency, UHF) (300MHz ~ 3000MHz) radar emits a beam of electromagnetic energy through modulated radio waves and directional antennas. Using the relatively long wavelength of radio waves, it can detect the speed of ultra-long-distance moving targets, angle features. When the main threat in the UHF band comes from long-range radar systems, they work flexibly, have a large bandwidth (>20%), and when electromagnetic waves propagate in common electromagnetic materials, the electric field, magnetic field, and wave vector direction satisfy the right-hand rule , the permittivity and permeability are fixed, the relevant parameters are positive, and have a positive refractive index, which cannot flexibly change the elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q3/28H01Q3/30H01Q15/14H01Q17/00
Inventor 廖希王洋邵羽叶志红
Owner CHONGQING UNIV OF POSTS & TELECOMM
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