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VHF频段极窄带高温超导滤波器的研制
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Abstract:
本文研制了一款VHF频段的四阶极窄带高温超导滤波器，该滤波器相对带宽为0.8‰，插入损耗小于0.7 dB。滤波器基于切比雪夫原型设计，由直径2英寸的氧化镁(MgO)为基底的高温超导薄膜材料DyBCO制作，采用Sonnet软件进行滤波器的电路搭建、电磁场仿真。文章给出了极窄带滤波器的等效电路图、理论曲线、耦合矩阵、物理电路、模拟仿真和实际测试结果。
In this paper, a fourth-order very narrow-band high-temperature superconducting filter with a relative bandwidth of 0.8‰ and insertion loss less than 0.7 dB is developed for the VHF band. The filter is based on a Chebyshev prototype design and is fabricated from DyBCO, a 2-inch diameter magnesium oxide (MgO) based high-temperature superconducting thin film material. The circuit construction and electromagnetic field simulation of the filter are performed by using Sonnet soft-ware. Equivalent circuit diagrams, theoretical curves, coupling matrices, physical circuits, simulations and practical test results of the very narrow band filter are presented in the article.
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