研究目的
Designing a novel tunable filter using a circuit model of a periodic array of PT-symmetric waveguides to control the size of bandgap and allowed frequencies propagating within the structure.
研究成果
The PT-symmetric electronic circuit model allows for tunable filtering by varying the gain/loss value, controlling the bandgap in the eigenvalue diagram. The Q-factor of the structure can be varied, achieving tunable Q from 20 to greatest in the central frequency of 0.283 MHz. The design's high-speed tunability and simplicity are its key features.
研究不足
The study is limited by the finite number of waveguides considered and the simplification of ignoring some parameters such as mutual inductances in calculating the band diagram.
1：Experimental Design and Method Selection:
The study employs a circuit model consisting of a pair of coupled circuits with amplification resistance and equivalent attenuation to simulate PT-symmetric waveguides.
2：Sample Selection and Data Sources:
The model uses inductors and capacitors with specific values to represent the waveguides.
3：List of Experimental Equipment and Materials:
Components include inductors (L=
4：584mH), capacitors (C=7nF), and resistors (R=300Ω to 100kΩ). Experimental Procedures and Operational Workflow:
The study involves analyzing the frequency response of the circuit model to observe its behavior for different values of frequencies.
5：Data Analysis Methods:
The band structure is analyzed using eigenvalues versus Bloch wavenumber, and the frequency response is characterized by the ratio of output to input signal.
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