对称带状线是创建传输线的可靠方法。带状线是 TEM（横向电磁）传输线。建模近似可用于设计微带走线。通过了解带状线传输线，设计人员可以正确构建这些结构以满足他们的需求。

The symmetric stripline is reliable method for creating a transmission line. The stripline is a TEM (transverse electromagnetic) transmission line. Modeling approximation can be used to design the microstrip trace. By understanding the stripline transmission line, designers can properly build these structures to meet their needs.

带状线由悬在两个接地层之间的扁平导体构成。导体和接地层由电介质隔开。带状线的一个优点是与微带线相比，相邻迹线之间的隔离度有所提高。

A stripline is constructed with a flat conductor suspended between two ground planes. The conductor and ground planes are separated by a dielectric. One advantage of the stripline is that there is an improve isolation between adjacent traces when compared with the microstrip.

带状线传输线模型 Stripline Transmission Line Models

对于微带传输线，带状线的阻抗Z ₀ 取决于导体宽度的比值以及信号和地平面之间的间隔。在对称带状线的情况下，Z _0,SS 可以根据文件 IPC-2141A [1] 中包含的公式计算，特别是第 4.2.4 段。

特性阻抗计算可分为两种情况，一种用于 窄信号导体 ，另一种用于 宽信号导体。

As for a microstrip transmission line, the impedance Z₀ of a stripline depends on the ratio of the conductor width and the separation between signal and ground planes. In case of a symmetric stripline, Z_0,SS can be computed according to the formulas contained in the document IPC-2141A [1], in particular paragraph 4.2.4.

The characteristic impedance computation can be broken down into two cases, one for a narrow signal conductor and one for a wide signal conductor.

对于 窄信号导体，即 w/b < 0.35，特性阻抗 Z _0,SS的适当公式为：

For the narrow signal conductor, that is for w/b < 0.35, the appropriate formula for the characteristic impedance, Z_0,SS, is:

  Eq. 1

where:

b = 2h + t

and:

  Eq. 2

对于 宽信号导体，即 w/b ≥0.35，特性阻抗 Z _0,SS的适当公式为：

For the wide signal conductor, that is for w/b ≥0.35, the appropriate formula for the characteristic impedance, Z_0,SS, is:

  Eq. 3

where:

  Eq. 4