嵌入式微带在结构上与微带传输线相似。建模近似可用于设计嵌入式微带走线。通过了解嵌入式微带传输线,设计人员可以正确构建这些结构以满足他们的需求。
The embedded microstrip is a similar in construction to the microstrip transmission line. Modeling approximation can be used to design the embedded microstrip trace. By understanding the embedded microstrip transmission line, designers can properly build these structures to meet their needs.
嵌入式微带线由悬垂在接地平面上的扁平导体构成。导体和接地层由电介质隔开。导体上方还有一层介电材料。嵌入式微带传输线的一种情况是带有阻焊层的微带迹线。
An embedded microstrip is constructed with a flat conductor suspended over a ground plane. The conductor and ground plane are seperated by a dielectric. There is also a layer of dielectric material above the conductor. One case of an embedded microstrip transmision line is a microstrip trace with soldermask.
已创建模型来近似嵌入式微带传输线的特性。文件 IPC-2141A [1] 中包含的公式提供了一个很好的近似值。对于嵌入式(内部)微带线,应使用第 4.2.3 节中提供的公式。特性阻抗由下式给出:
Models have been created to approximate the characteristics of the embedded microstrip transmission line. A good approximation is provided by the formulas contained in the document IPC-2141A [1]. For an embedded (internal) microstrip, the formulas provided in paragraph 4.2.3 shall be used. The characteristic impedance is given by:
Eq. 1
where Z0,surf can be computed as specified in Eq. 1 of the Microstrip Calculator using H2 in place of h, εr,eff can be computed as specified in Eq. 2 of the Microstrip Calculator, h=H1 and b=H2-H1.