波导-带状线-同轴线型定向耦合器特性
Characteristics of waveguide-stripline-coaxial line directional coupler
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摘要: 给出了波导-带状线-同轴线型定向耦合器技术参量的计算表达式,利用Matlab软件定量地研究了耦合器结构尺寸和输入波频率对耦合器的技术参量的影响。数值结果表明:方向角对耦合度及方向性的影响最大;耦合小孔深度对理想方向角影响最大;输入频率在低频端(小于2.0 GHz)对理想方向角的影响很大,而在中高频端的影响较小。在波导-带状线-同轴线型定向耦合器的设计中,除了可以改变小孔大小及旋转方向来满足耦合度和方向性外,还可以通过改变带状线尺寸以及耦合器位置来调节耦合度和方向性。Abstract: Calculation expressions of technical parameters are derived for the waveguide-stripling-coaxial line directional coupler. The impact of structure dimension of the coupler and input frequency on the parameters is studied using Matlab. Numerical results indicate that, included angle has the greatest impact on coupling coefficient and directivity; optimal directivity angle are most sensitive to coupling hole depth, and it varies sharply with input frequency in low frequency range (less tham 2.0 GHz) and becomes much smoother when the frequency goes higher. Thus in the design of this coupler, designed coupling coefficient and directivity could be achieved through adjusting stripline size and coupler position besides the conventional ways of changing aperture size and rotation direction.
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Key words:
- directional coupler /
- aperture coupling /
- waveguide /
- stripline
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