A two-phase modulation board and method for implementing radar spectrum shifting

Abstract

The invention relates to the field of wireless communication, and particularly to a two-phase modulating board for performing radar spectrum shifting and a method thereof. The two-phase modulating board comprises a frequency selection surface (FSS), a medium spacing layer and a metal grounding layer. The two-phase modulating board is constructed through setting a three-layer adjustable-frequency reflection modulation board based on the FSS. The FSS is constructed to an adjustable resistor, a capacitor and an inductor. A mathematical model is established by means of a dynamic transmission line equivalent circuit. The spectrum shifting on a two-phase modulating surface is researched according to the mathematical model. When the two-phase modulating surface is in a high-impedance state and a low-impedance state, an average reflection coefficient in a time period is 0, and energy of a radar reflection echo is shifted to a sideband. On other conditions, multiple reflections occur in the modulating board, thereby changing the frequency response characteristic of a system. The two-phase modulating board provided by the invention can shift the energy of the reflection echo to the sideband and furthermore performs functions of reducing a reflection coefficient and realizing high wave absorbing capability.

Description

technical field [0001] The invention relates to the field of radar stealth, in particular to a two-phase modulation board and a method for implementing radar spectrum shifting. Background technique [0002] With the development of radar technology, the frequency range of radar has been extended from 8-12GHz (X frequency band) and 12-18GHz (Ku frequency band) to 2-18GHz. Therefore, it is necessary to propose materials that can work in low frequency bands and high bandwidth to design radar absorbers. oscilloscope. UHF (300MHz~3000MHz) radar uses modulated electric waves and directional antennas to emit a beam of electromagnetic energy. Using its relatively long wave wavelength, it can detect the speed, angle and other characteristics of ultra-long-distance moving targets, and is widely used in strategic early warning. In various land, sea and air detection systems. The radar signal transmitted in this frequency band has the characteristics of flexible incoming wave direction...

AI Technical Summary

Problems solved by technology

Once the radar absorbing surface based on FSS is designed and manufactured, its electromagnetic characteristics will be fixed, so it cannot be used in complex and variable environments, let alone spectrum shift for complex radar signals with large bandwidth, multi-directional, and different polarization

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