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微带线用于食品原料、包装材料等含水量的监控时,被具有高相对介电系数的湿介质所复盖,其边缘场与介质相互作用,传播常数发生变化.因此传播常数的变化,可以根据湿度或影响介质特性的其它材料来校正.用准静态型式研究所计算的谐振频率忽略了色散,对于比较高的频率无效.我们利用在谱线中等效传输线的概念,应用Galerkin法和Paraeval定理,求得传播常数,从而获得色散关系.1 理论分析图(1)表示具有介质层复盖的微带线的横截面,该结构具有混合场,所有混合场分量可由对у轴为TM模和TE模的线性组合而获得.沿у方向的电场分量E,(х,у)可由E,(α,у)的付里叶逆变换得到,即(1)用同样的方法可得沿у方向的磁场分量.由上式可见,电磁场为沿Q方向传播的非均匀平面波的叠
Microstrip lines are used to monitor the water content of food raw materials and packaging materials and are covered by wet medium with high relative dielectric constant. The fringe field interacts with the medium and the propagation constant changes. Therefore, the change of propagation constant, Can be corrected for humidity or other materials that affect the properties of the medium.Studies have calculated the resonant frequency in a quasi-static form to ignore the dispersion, which is ineffective for higher frequencies.We use the concept of equivalent transmission lines in a spectral line, applying the Galerkin and Paraeval Theorem, obtain the propagation constant, in order to obtain the dispersion relation.1 theoretical analysis (1) shows the cross-section of the microstrip line covered with the dielectric layer, the structure has a mixing field, all the mixing field component by TM axis And TE mode obtained by the linear combination of у direction along the direction of the electric field component E, (х, у) by the E, (α, у) inverse Fourier transform obtained (1) the same method can be obtained edge Direction of the magnetic field component can be seen from the above equation, the electromagnetic field is propagating in the Q direction of non-uniform plane wave stack