Time Reversal of Electromagnetic Waves Using the Dispersion Compensation Approach

Abstract

A new electronic system to realize time reversal (TR) of electromagnetic waves is proposed in this paper. By utilizing the dispersion compensation approach, the system mainly contains a chirped pulse generator, a wideband multiplier, and a chirped delay line (CDL). The TR transformation is achieved by dispersing the modulated chirped pulse through a single microwave CDL. The chirped electromagnetic band gap structure with a reflected group delay slope is fabricated and used to be the CDL. It has been demonstrated by experiments that TR of triangular-wave signals in the microwave regime can be obtained through the proposed system.

Research on the acquisition of time‐reversed electromagnetic waves based on Fourier transform theory

“…Moreover, compared to conventional implementation scheme system with chirped dispersive delay lines, the proposed system is more stable with higher time‐bandwidth products and can process longer time duration and wider bandwidth. Thus, with better system stability, the scheme is suitable for application systems with high demand for input signal time‐bandwidth products or high precision in inversion.…”

“…The ASP technique requires no discretization and can avoid the limitations of the DSP technique, especially for dealing with signals at high frequency. With the advantages of real‐time performance and large time‐bandwidth product based on ASP technique, extensive researches using ASP have been carried out by scholars at home and abroad . Though compelling results have been reported, existing approaches rely on advanced instruments face the disadvantages of high cost, and unreal‐time processing, the productions are still confined in the laboratory.…”

“…With the advantages of realtime performance and large time-bandwidth product based on ASP technique, 5 extensive researches using ASP have been carried out by scholars at home and abroad. [6][7][8][9][10] Though compelling results have been reported, existing approaches rely on advanced instruments face the disadvantages of high cost, and unreal-time processing, the productions are still confined in the laboratory. Therefore, the development of high-efficiency TRM system is the urgent problem of realizing the leap from laboratory to practical experimentations.…”

A Fully Electronic Time Reversal Mirror System Based on Temporal Imaging

“…However, the total system is expensive and difficult to integrate because the kind of TI system needs a model-locked femtosecond laser. Today, the implementation of fully electric TRM have been an attractive research direction [22].…”

“…The DDS with an LGD can be realized by the chirp delay line, which can have very wide bandwidth (12GHz) [22], [24]. Its GDS can arrive about 0.8ns/GHz, and the corresponding duration of TI is less than 2ns [22]. Because the DDS is multiple reflection structure, its group delay exhibits undesired ripple resulting bad linearity [25].…”