研究目的
To determine the specific features of pulse propagation in Bragg-type layered structures (BTLS), including the effects of negative group delay and the influence of zero positions on the properties of BTLS.
研究成果
The investigation revealed that negative group delay in BTLS can be observed in regions with anomalous dispersion, corresponding to minimal phase systems. The number of layers and permittivity contrast significantly influence the reflection properties and pulse propagation characteristics. The study provides insights into the design of BTLS for applications requiring specific pulse shaping and delay properties.
研究不足
The study is limited to numerical simulations and theoretical analysis without experimental validation. The effects of material losses and manufacturing imperfections are not considered.
1：Experimental Design and Method Selection:
The study involves numerical simulation of pulse propagation in BTLS using the transmission matrix method and fractional-rational approximation for pole-zero analysis.
2：Sample Selection and Data Sources:
Structures with varying numbers of layers (N = 19, 39, 79) and periods (P = 10, 20, 40) were considered.
3：List of Experimental Equipment and Materials:
Numerical simulations were performed without specific hardware mentioned.
4：Experimental Procedures and Operational Workflow:
The study analyzed the reflection and transmission properties of BTLS under different pulse excitations (sinc(x), Gaussian, Lorenz, exponential).
5：Data Analysis Methods:
The analysis included the examination of frequency characteristics, pole-zero positions, and time-domain signal behavior.
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