非对称共面波导色散特性及应用的研究
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摘要
目前在微波集成电路以及毫米波和光学集成电路中，共面波导的应用已经越来越受到重视，但是，我们知道对称共面波导在理论设计上是对称结构的，但实际制作出来的共面波导一定是非对称的；而且在制作微波毫米波器件时，例如转接器和耦合器等，非对称共面波导也是很需要的。因此，非对称共面波导更具有一般性和应用灵活性。针对以上情况，本文使用时域有限差分法对非对称共面波导和带金属底板非对称共面波导的色散特性进行了研究，并首次使用矢量网络分析仪对其色散特性进行了测试。
在各种数值计算方法中，时域有限差分法近年来由于它的一次时域计算就可以得到很宽频谱内信息的优势引起了人们高度的重视。本文使用时域有限差分法计算的时候，提出了全空间的计算模型和基于MUR-PML混合吸收边界条件。全空间计算模型是适合所有的不对称结构的待研究体的，而且包括了介质下面的空气部分，使仿真更加的接近实验真实情况；基于MUR-PML混合吸收边界条件的时域有限差分法非常适合计算传输线这种结构，因为传输线是传送电磁波的，电磁能量主要是沿着中心导带行进，因此在两个传输端面上设置PML完全匹配层吸收边界条件，在其他面上设置MUR二阶吸收边界条件，会大大提高计算效率，而且计算结果与XFDTD仿真软件计算结果相比较，基本趋于一致。
在微波毫米波集成电路中，共面波导的应用越来越广泛，不但可以传输信号，还可以制作各种器件，然而在和别的传输线，例如槽线连接的时候，由于结构必须对称，因此限制了它的应用，而相对于对称共面波导来说，非对称共面波导就具有更大的灵活性，针对这种情况，本文给出了非对称共面波导一槽线转接器，并计算了它的S参数，通过使用这种转接器，大大提高了槽线和共面波导连接的灵活性。
Coplanar waveguide (CPW) is important planar transmission line in microwave and millimeter-wave integrated circuits (MMIC). It is known that CPW is symmetrical in theory, but it is asymmetrical in practice. And asymmetrical coplanar waveguide (ACPW) is very useful in some particular applications. Finite-Difference Time-Domain (FDTD) is first proposed to analyze dispersion characteristic of ACPW and ACPW with conductor backing, and the measurements are presented firstly in this paper.
In all numerical arithmetics, FDTD is a very efficient method. It is proposed firstly in this paper that the full space calculation model and mixed absorbing boundary conditions (ABCs) based on MUR-PML. The full space calculation model, which suits for the asymmetric structure sometimes even including air below the surface of medium, can enable simulative result to approach real one. The FDTD algorithm based on the mixed ABCs is proper to calculate the transmission line where the electromagnetic wave is transmitted in order to send electromagnetic energy along central conductor. The calculation efficiency will be raised if the PML absorbing boundary condition is set on both planes of transmitting direction and so is the MUR two-order absorbing boundary condition in the other planes. The numerical result is almost consistent with the one in XFDTD software.
CPW is extensively applied not only to transmit signal but also to manufacture a large number kinds of apparatus in MMIC, but it is prevented from connection to slotline due to its symmetric structure. Comparing with the CPW, ACPW is more common and flexible. So the ACPW-Slotline Transition is advanced firstly, and its S parameter is proposed in this paper.
在各种数值计算方法中，时域有限差分法近年来由于它的一次时域计算就可以得到很宽频谱内信息的优势引起了人们高度的重视。本文使用时域有限差分法计算的时候，提出了全空间的计算模型和基于MUR-PML混合吸收边界条件。全空间计算模型是适合所有的不对称结构的待研究体的，而且包括了介质下面的空气部分，使仿真更加的接近实验真实情况；基于MUR-PML混合吸收边界条件的时域有限差分法非常适合计算传输线这种结构，因为传输线是传送电磁波的，电磁能量主要是沿着中心导带行进，因此在两个传输端面上设置PML完全匹配层吸收边界条件，在其他面上设置MUR二阶吸收边界条件，会大大提高计算效率，而且计算结果与XFDTD仿真软件计算结果相比较，基本趋于一致。
在微波毫米波集成电路中，共面波导的应用越来越广泛，不但可以传输信号，还可以制作各种器件，然而在和别的传输线，例如槽线连接的时候，由于结构必须对称，因此限制了它的应用，而相对于对称共面波导来说，非对称共面波导就具有更大的灵活性，针对这种情况，本文给出了非对称共面波导一槽线转接器，并计算了它的S参数，通过使用这种转接器，大大提高了槽线和共面波导连接的灵活性。
Coplanar waveguide (CPW) is important planar transmission line in microwave and millimeter-wave integrated circuits (MMIC). It is known that CPW is symmetrical in theory, but it is asymmetrical in practice. And asymmetrical coplanar waveguide (ACPW) is very useful in some particular applications. Finite-Difference Time-Domain (FDTD) is first proposed to analyze dispersion characteristic of ACPW and ACPW with conductor backing, and the measurements are presented firstly in this paper.
In all numerical arithmetics, FDTD is a very efficient method. It is proposed firstly in this paper that the full space calculation model and mixed absorbing boundary conditions (ABCs) based on MUR-PML. The full space calculation model, which suits for the asymmetric structure sometimes even including air below the surface of medium, can enable simulative result to approach real one. The FDTD algorithm based on the mixed ABCs is proper to calculate the transmission line where the electromagnetic wave is transmitted in order to send electromagnetic energy along central conductor. The calculation efficiency will be raised if the PML absorbing boundary condition is set on both planes of transmitting direction and so is the MUR two-order absorbing boundary condition in the other planes. The numerical result is almost consistent with the one in XFDTD software.
CPW is extensively applied not only to transmit signal but also to manufacture a large number kinds of apparatus in MMIC, but it is prevented from connection to slotline due to its symmetric structure. Comparing with the CPW, ACPW is more common and flexible. So the ACPW-Slotline Transition is advanced firstly, and its S parameter is proposed in this paper.
引文
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