• 首页
• HFSS教程
• ADS教程
• CST教程
• 射频工程师培训
• 微波仪器操作培训
• 天线设计培训
• 射频专业基础课

Ansoft Designer / Ansys Designer 在线帮助文档：

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

S-Parameters

The S matrix indicates what fraction of an incident voltage wave is transmitted or reflected at each port. The voltage wave is normalized with respect to the square root of the characteristic impedance of the port, for example, a = V*Zo-1/2. If the characteristic impedance is completely real, the elements of the S matrix are equivalent to the square root of the fraction of power transmitted or reflected. An S-matrix for a three-port structure is:

where:

• All quantities are complex numbers.

• a_i represents the incident voltage wave at port i.

• b_i represents the transmitted or reflected voltage wave at port i.

• The phase of a_i and b_i is the phase of the incident and reflected/transmitted voltage wave at t = 0:

Za_i is the phase angle of the excitation voltage wave on port i at t = 0 (by default, it is zero).

Zb_i is the phase angle of the reflected or transmitted voltage wave with respect to the excitation voltage wave.

• S_ij is the S-parameter describing how much of the incident voltage wave at port j is reflected back or transmitted to port i. For example, S₃₁ is used to compute the amount of power from the port 1 excitation that is transmitted to port 3. The phase of S₃₁ specifies the phase shift that occurs as the voltage wave travels from port 1 to port 3.

The topics for this section include:

S-Parameters and Frequency Points

Computing Characteristic Impedance

Renormalized S-Matrices

Computing the Z-Matrix

Computing the Y-Matrix

De-embedded S-Matrices

                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