开槽深度和坡度对高频高阶模带宽和中心频移的影响 |
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引用本文: | 丁学用,王连胜. 开槽深度和坡度对高频高阶模带宽和中心频移的影响[J]. 电波科学学报, 2022, 37(3): 478-483. DOI: 10.12265/j.cjors.2021136 |
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作者姓名: | 丁学用 王连胜 |
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作者单位: | 三亚学院理工学院,三亚 572022 |
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基金项目: | 海南省自然科学基金(620MS063);海南省教育厅教改项目基金(Hnjg2019ZD-23) |
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摘 要: | 为对构建太赫兹频率下高阶单模工作的同轴布喇格谐振腔提供理论依据,基于模式耦合理论,比较研究了不同开槽深度和不同开槽坡度形状及坡度角对工作在太赫兹频率高频高阶耦合模式下工作模式和竞争模式带宽、中心频率偏移特性的影响. 结果表明:工作模式和竞争模式的带宽随着开槽深度的加深都变宽,但中心谐振频率点几乎没有偏移,槽深加深,带隙重叠现象会恶化,不利于模式选择;正圆锥形坡度方式时随着坡度角的增加,工作模式的中心频率点没有发生偏移,竞争模式中心频率点靠近工作模式中心频率点,不利于带隙重叠现象的抑制;倒圆锥形坡度方式时,随着坡度角的增大,竞争模式的中心频率点远离工作模式中心频率点,很好地抑制了带隙重叠;正圆锥形坡度和倒圆锥形坡度对带宽的影响都不大. 这些特性有利于拓展同轴布喇格结构作为反射器和滤波器的性能.
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关 键 词: | 同轴布喇格结构 开槽深度 开槽坡度 坡度角 中心频率点偏移 带隙重叠 |
收稿时间: | 2021-05-13 |
Influence of ripple depth and ripple taper on bandwidth and center frequency shift operating at high frequency high order modes |
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Affiliation: | The Polytechnic Institute of San Ya University, Sanya 572022, China |
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Abstract: | In order to provide a theoretical basis for the construction of a coaxial Bragg resonator with high-order single-mode operation at THz frequency. Based on the mode coupling theory, the influence of different ripple depths, different ripple taper shapes and different taper angles on the bandwidth and center frequency offset characteristics of the working mode and the competitive mode in the high-frequency high-order coupling mode of terahertz frequency are compared and studied. The results show that the bandwidth of the working mode and the competition mode becomes wider with the deepening of the ripple depth, but the center resonant frequency point almost does not shift, and the band gap overlap will worsen with the deepening of the ripple depth, which is not conducive to the mode selection; with the increase of the taper angle, the central frequency of the operating mode does not shift under the positive taper ripples structure, and the center frequency of the competition mode is close to the center frequency of the operating mode, which is not conducive to the suppression of the band gap overlap; with the increase of the taper angle, the center frequency of the competition mode of the negative taper ripples is far away from the operating mode, which is a good suppression of the band gap overlap; the positive taper ripples structure and negative taper ripples structure have little effect on the bandwidth. These characteristics are beneficial to expand the performance of the coaxial Bragg structure as a reflector and filter. |
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