淘宝官方店推荐课程在线工具联系方式关于我们

	微波射频仿真设计 Ansoft Designer 中文培训教程 \| HFSS视频培训教程套装
	Agilent ADS 视频培训教程 \| CST微波工作室视频教程 \| AWR Microwave Office

首页 >> Ansoft Designer >> Ansoft Designer在线帮助文档

Ansoft Designer / Ansys Designer 在线帮助文档：

HFSS and Planar EM Simulators >
Planar EM Technical Notes >
S-Parameters >
Renormalized S-Matrices

R enormalized S-Matrices

Before a structure’s generalized S-matrix can be used to compute the reflection and transmission of signals, the generalized S-matrix must be normalized to the appropriate impedance. For example, if a generalized S-matrix has been normalized to 50 ohms, it can be used to compute reflection and transmission directly from signals normalized to 50 ohms, as in

where the input signals, Vi_i, and output signals, Vo_i, are both normalized to 50 ohms. To renormalize an S-matrix to a specific impedance, the system calculates a unique impedance matrix associated with the structure. The unique impedance matrix, Z, is

where

• S is the nxn generalized S-matrix.

• I is an nxn identity matrix.

• Z₀ is a matrix with the characteristic impedance of each port as a diagonal value.

The renormalized S-matrix is then calculated from Z using this relationship:

where

• Z is the structure’s unique impedance matrix.

• Z_W and Y_W are matrices with the desired impedance and admittance as diagonal values.

Visualize the generalized S-matrix as an S-matrix that has been renormalized to the characteristic impedances of the structure. Therefore, if a diagonal matrix containing the characteristic impedances of the structure is used as Z_W in the previous equation, the result would be the generalized S-matrix again.

Note

S-matrices for modes other than the dominant one cannot be renormalized or used in circuit simulators.

HFSS视频教程 ADS视频教程 CST视频教程 Ansoft Designer 中文教程


Copyright © 2006 - 2013 微波EDA网, All Rights Reserved 业务联系：mweda@163.com